// dear imgui, v1.52 WIP
// (drawing and font code)

// Contains implementation for
// - ImDrawList
// - ImDrawData
// - ImFontAtlas
// - ImFont
// - Default font data

#if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_WARNINGS)
#define _CRT_SECURE_NO_WARNINGS
#endif

#include "imgui.h"
#define IMGUI_DEFINE_MATH_OPERATORS
#define IMGUI_DEFINE_PLACEMENT_NEW
#include "imgui_internal.h"

#include <stdio.h>      // vsnprintf, sscanf, printf
#if !defined(alloca)
#ifdef _WIN32
#include <malloc.h>     // alloca
#elif (defined(__FreeBSD__) || defined(FreeBSD_kernel) || defined(__DragonFly__)) && !defined(__GLIBC__)
#include <stdlib.h>     // alloca. FreeBSD uses stdlib.h unless GLIBC
#else
#include <alloca.h>     // alloca
#endif
#endif

#ifdef _MSC_VER
#pragma warning (disable: 4505) // unreferenced local function has been removed (stb stuff)
#pragma warning (disable: 4996) // 'This function or variable may be unsafe': strcpy, strdup, sprintf, vsnprintf, sscanf, fopen
#define snprintf _snprintf
#endif

#ifdef __clang__
#pragma clang diagnostic ignored "-Wold-style-cast"         // warning : use of old-style cast                              // yes, they are more terse.
#pragma clang diagnostic ignored "-Wfloat-equal"            // warning : comparing floating point with == or != is unsafe   // storing and comparing against same constants ok.
#pragma clang diagnostic ignored "-Wglobal-constructors"    // warning : declaration requires a global destructor           // similar to above, not sure what the exact difference it.
#pragma clang diagnostic ignored "-Wsign-conversion"        // warning : implicit conversion changes signedness             //
#if __has_warning("-Wreserved-id-macro")
#pragma clang diagnostic ignored "-Wreserved-id-macro"      // warning : macro name is a reserved identifier                //
#endif
#elif defined(__GNUC__)
#pragma GCC diagnostic ignored "-Wunused-function"          // warning: 'xxxx' defined but not used
#pragma GCC diagnostic ignored "-Wdouble-promotion"         // warning: implicit conversion from 'float' to 'double' when passing argument to function
#pragma GCC diagnostic ignored "-Wconversion"               // warning: conversion to 'xxxx' from 'xxxx' may alter its value
#pragma GCC diagnostic ignored "-Wcast-qual"                // warning: cast from type 'xxxx' to type 'xxxx' casts away qualifiers
#endif

//-------------------------------------------------------------------------
// STB libraries implementation
//-------------------------------------------------------------------------

//#define IMGUI_STB_NAMESPACE     ImGuiStb
//#define IMGUI_DISABLE_STB_RECT_PACK_IMPLEMENTATION
//#define IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION

#ifdef IMGUI_STB_NAMESPACE
namespace IMGUI_STB_NAMESPACE
{
#endif

#ifdef _MSC_VER
#pragma warning (push)
#pragma warning (disable: 4456)                             // declaration of 'xx' hides previous local declaration
#endif

#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wold-style-cast"         // warning : use of old-style cast                              // yes, they are more terse.
#pragma clang diagnostic ignored "-Wunused-function"
#pragma clang diagnostic ignored "-Wmissing-prototypes"
#endif

#ifdef __GNUC__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wtype-limits"              // warning: comparison is always true due to limited range of data type [-Wtype-limits]
#endif

#define STBRP_ASSERT(x)    IM_ASSERT(x)
#ifndef IMGUI_DISABLE_STB_RECT_PACK_IMPLEMENTATION
#define STBRP_STATIC
#define STB_RECT_PACK_IMPLEMENTATION
#endif
#include "stb_rect_pack.h"

#define STBTT_malloc(x,u)  ((void)(u), ImGui::MemAlloc(x))
#define STBTT_free(x,u)    ((void)(u), ImGui::MemFree(x))
#define STBTT_assert(x)    IM_ASSERT(x)
#ifndef IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION
#define STBTT_STATIC
#define STB_TRUETYPE_IMPLEMENTATION
#else
#define STBTT_DEF extern
#endif
#include "stb_truetype.h"

#ifdef __GNUC__
#pragma GCC diagnostic pop
#endif

#ifdef __clang__
#pragma clang diagnostic pop
#endif

#ifdef _MSC_VER
#pragma warning (pop)
#endif

#ifdef IMGUI_STB_NAMESPACE
} // namespace ImGuiStb
using namespace IMGUI_STB_NAMESPACE;
#endif

//-----------------------------------------------------------------------------
// ImDrawList
//-----------------------------------------------------------------------------

static const ImVec4 GNullClipRect(-8192.0f, -8192.0f, +8192.0f, +8192.0f); // Large values that are easy to encode in a few bits+shift

void ImDrawList::Clear()
{
    CmdBuffer.resize(0);
    IdxBuffer.resize(0);
    VtxBuffer.resize(0);
    _VtxCurrentIdx = 0;
    _VtxWritePtr = NULL;
    _IdxWritePtr = NULL;
    _ClipRectStack.resize(0);
    _TextureIdStack.resize(0);
    _Path.resize(0);
    _ChannelsCurrent = 0;
    _ChannelsCount = 1;
    // NB: Do not clear channels so our allocations are re-used after the first frame.
}

void ImDrawList::ClearFreeMemory()
{
    CmdBuffer.clear();
    IdxBuffer.clear();
    VtxBuffer.clear();
    _VtxCurrentIdx = 0;
    _VtxWritePtr = NULL;
    _IdxWritePtr = NULL;
    _ClipRectStack.clear();
    _TextureIdStack.clear();
    _Path.clear();
    _ChannelsCurrent = 0;
    _ChannelsCount = 1;
    for (int i = 0; i < _Channels.Size; i++)
    {
        if (i == 0) memset(&_Channels[0], 0, sizeof(_Channels[0]));  // channel 0 is a copy of CmdBuffer/IdxBuffer, don't destruct again
        _Channels[i].CmdBuffer.clear();
        _Channels[i].IdxBuffer.clear();
    }
    _Channels.clear();
}

// Use macros because C++ is a terrible language, we want guaranteed inline, no code in header, and no overhead in Debug mode
#define GetCurrentClipRect()    (_ClipRectStack.Size ? _ClipRectStack.Data[_ClipRectStack.Size-1]  : GNullClipRect)
#define GetCurrentTextureId()   (_TextureIdStack.Size ? _TextureIdStack.Data[_TextureIdStack.Size-1] : NULL)

void ImDrawList::AddDrawCmd()
{
    ImDrawCmd draw_cmd;
    draw_cmd.ClipRect = GetCurrentClipRect();
    draw_cmd.TextureId = GetCurrentTextureId();

    IM_ASSERT(draw_cmd.ClipRect.x <= draw_cmd.ClipRect.z && draw_cmd.ClipRect.y <= draw_cmd.ClipRect.w);
    CmdBuffer.push_back(draw_cmd);
}

void ImDrawList::AddCallback(ImDrawCallback callback, void* callback_data)
{
    ImDrawCmd* current_cmd = CmdBuffer.Size ? &CmdBuffer.back() : NULL;
    if (!current_cmd || current_cmd->ElemCount != 0 || current_cmd->UserCallback != NULL)
    {
        AddDrawCmd();
        current_cmd = &CmdBuffer.back();
    }
    current_cmd->UserCallback = callback;
    current_cmd->UserCallbackData = callback_data;

    AddDrawCmd(); // Force a new command after us (see comment below)
}

// Our scheme may appears a bit unusual, basically we want the most-common calls AddLine AddRect etc. to not have to perform any check so we always have a command ready in the stack.
// The cost of figuring out if a new command has to be added or if we can merge is paid in those Update** functions only.
void ImDrawList::UpdateClipRect()
{
    // If current command is used with different settings we need to add a new command
    const ImVec4 curr_clip_rect = GetCurrentClipRect();
    ImDrawCmd* curr_cmd = CmdBuffer.Size > 0 ? &CmdBuffer.Data[CmdBuffer.Size-1] : NULL;
    if (!curr_cmd || (curr_cmd->ElemCount != 0 && memcmp(&curr_cmd->ClipRect, &curr_clip_rect, sizeof(ImVec4)) != 0) || curr_cmd->UserCallback != NULL)
    {
        AddDrawCmd();
        return;
    }

    // Try to merge with previous command if it matches, else use current command
    ImDrawCmd* prev_cmd = CmdBuffer.Size > 1 ? curr_cmd - 1 : NULL;
    if (curr_cmd->ElemCount == 0 && prev_cmd && memcmp(&prev_cmd->ClipRect, &curr_clip_rect, sizeof(ImVec4)) == 0 && prev_cmd->TextureId == GetCurrentTextureId() && prev_cmd->UserCallback == NULL)
        CmdBuffer.pop_back();
    else
        curr_cmd->ClipRect = curr_clip_rect;
}

void ImDrawList::UpdateTextureID()
{
    // If current command is used with different settings we need to add a new command
    const ImTextureID curr_texture_id = GetCurrentTextureId();
    ImDrawCmd* curr_cmd = CmdBuffer.Size ? &CmdBuffer.back() : NULL;
    if (!curr_cmd || (curr_cmd->ElemCount != 0 && curr_cmd->TextureId != curr_texture_id) || curr_cmd->UserCallback != NULL)
    {
        AddDrawCmd();
        return;
    }

    // Try to merge with previous command if it matches, else use current command
    ImDrawCmd* prev_cmd = CmdBuffer.Size > 1 ? curr_cmd - 1 : NULL;
    if (prev_cmd && prev_cmd->TextureId == curr_texture_id && memcmp(&prev_cmd->ClipRect, &GetCurrentClipRect(), sizeof(ImVec4)) == 0 && prev_cmd->UserCallback == NULL)
        CmdBuffer.pop_back();
    else
        curr_cmd->TextureId = curr_texture_id;
}

#undef GetCurrentClipRect
#undef GetCurrentTextureId

// Render-level scissoring. This is passed down to your render function but not used for CPU-side coarse clipping. Prefer using higher-level ImGui::PushClipRect() to affect logic (hit-testing and widget culling)
void ImDrawList::PushClipRect(ImVec2 cr_min, ImVec2 cr_max, bool intersect_with_current_clip_rect)
{
    ImVec4 cr(cr_min.x, cr_min.y, cr_max.x, cr_max.y);
    if (intersect_with_current_clip_rect && _ClipRectStack.Size)
    {
        ImVec4 current = _ClipRectStack.Data[_ClipRectStack.Size-1];
        if (cr.x < current.x) cr.x = current.x;
        if (cr.y < current.y) cr.y = current.y;
        if (cr.z > current.z) cr.z = current.z;
        if (cr.w > current.w) cr.w = current.w;
    }
    cr.z = ImMax(cr.x, cr.z);
    cr.w = ImMax(cr.y, cr.w);

    _ClipRectStack.push_back(cr);
    UpdateClipRect();
}

void ImDrawList::PushClipRectFullScreen()
{
    PushClipRect(ImVec2(GNullClipRect.x, GNullClipRect.y), ImVec2(GNullClipRect.z, GNullClipRect.w));
    //PushClipRect(GetVisibleRect());   // FIXME-OPT: This would be more correct but we're not supposed to access ImGuiContext from here?
}

void ImDrawList::PopClipRect()
{
    IM_ASSERT(_ClipRectStack.Size > 0);
    _ClipRectStack.pop_back();
    UpdateClipRect();
}

void ImDrawList::PushTextureID(const ImTextureID& texture_id)
{
    _TextureIdStack.push_back(texture_id);
    UpdateTextureID();
}

void ImDrawList::PopTextureID()
{
    IM_ASSERT(_TextureIdStack.Size > 0);
    _TextureIdStack.pop_back();
    UpdateTextureID();
}

void ImDrawList::ChannelsSplit(int channels_count)
{
    IM_ASSERT(_ChannelsCurrent == 0 && _ChannelsCount == 1);
    int old_channels_count = _Channels.Size;
    if (old_channels_count < channels_count)
        _Channels.resize(channels_count);
    _ChannelsCount = channels_count;

    // _Channels[] (24 bytes each) hold storage that we'll swap with this->_CmdBuffer/_IdxBuffer
    // The content of _Channels[0] at this point doesn't matter. We clear it to make state tidy in a debugger but we don't strictly need to.
    // When we switch to the next channel, we'll copy _CmdBuffer/_IdxBuffer into _Channels[0] and then _Channels[1] into _CmdBuffer/_IdxBuffer
    memset(&_Channels[0], 0, sizeof(ImDrawChannel));
    for (int i = 1; i < channels_count; i++)
    {
        if (i >= old_channels_count)
        {
            IM_PLACEMENT_NEW(&_Channels[i]) ImDrawChannel();
        }
        else
        {
            _Channels[i].CmdBuffer.resize(0);
            _Channels[i].IdxBuffer.resize(0);
        }
        if (_Channels[i].CmdBuffer.Size == 0)
        {
            ImDrawCmd draw_cmd;
            draw_cmd.ClipRect = _ClipRectStack.back();
            draw_cmd.TextureId = _TextureIdStack.back();
            _Channels[i].CmdBuffer.push_back(draw_cmd);
        }
    }
}

void ImDrawList::ChannelsMerge()
{
    // Note that we never use or rely on channels.Size because it is merely a buffer that we never shrink back to 0 to keep all sub-buffers ready for use.
    if (_ChannelsCount <= 1)
        return;

    ChannelsSetCurrent(0);
    if (CmdBuffer.Size && CmdBuffer.back().ElemCount == 0)
        CmdBuffer.pop_back();

    int new_cmd_buffer_count = 0, new_idx_buffer_count = 0;
    for (int i = 1; i < _ChannelsCount; i++)
    {
        ImDrawChannel& ch = _Channels[i];
        if (ch.CmdBuffer.Size && ch.CmdBuffer.back().ElemCount == 0)
            ch.CmdBuffer.pop_back();
        new_cmd_buffer_count += ch.CmdBuffer.Size;
        new_idx_buffer_count += ch.IdxBuffer.Size;
    }
    CmdBuffer.resize(CmdBuffer.Size + new_cmd_buffer_count);
    IdxBuffer.resize(IdxBuffer.Size + new_idx_buffer_count);

    ImDrawCmd* cmd_write = CmdBuffer.Data + CmdBuffer.Size - new_cmd_buffer_count;
    _IdxWritePtr = IdxBuffer.Data + IdxBuffer.Size - new_idx_buffer_count;
    for (int i = 1; i < _ChannelsCount; i++)
    {
        ImDrawChannel& ch = _Channels[i];
        if (int sz = ch.CmdBuffer.Size) { memcpy(cmd_write, ch.CmdBuffer.Data, sz * sizeof(ImDrawCmd)); cmd_write += sz; }
        if (int sz = ch.IdxBuffer.Size) { memcpy(_IdxWritePtr, ch.IdxBuffer.Data, sz * sizeof(ImDrawIdx)); _IdxWritePtr += sz; }
    }
    AddDrawCmd();
    _ChannelsCount = 1;
}

void ImDrawList::ChannelsSetCurrent(int idx)
{
    IM_ASSERT(idx < _ChannelsCount);
    if (_ChannelsCurrent == idx) return;
    memcpy(&_Channels.Data[_ChannelsCurrent].CmdBuffer, &CmdBuffer, sizeof(CmdBuffer)); // copy 12 bytes, four times
    memcpy(&_Channels.Data[_ChannelsCurrent].IdxBuffer, &IdxBuffer, sizeof(IdxBuffer));
    _ChannelsCurrent = idx;
    memcpy(&CmdBuffer, &_Channels.Data[_ChannelsCurrent].CmdBuffer, sizeof(CmdBuffer));
    memcpy(&IdxBuffer, &_Channels.Data[_ChannelsCurrent].IdxBuffer, sizeof(IdxBuffer));
    _IdxWritePtr = IdxBuffer.Data + IdxBuffer.Size;
}

// NB: this can be called with negative count for removing primitives (as long as the result does not underflow)
void ImDrawList::PrimReserve(int idx_count, int vtx_count)
{
    ImDrawCmd& draw_cmd = CmdBuffer.Data[CmdBuffer.Size-1];
    draw_cmd.ElemCount += idx_count;

    int vtx_buffer_old_size = VtxBuffer.Size;
    VtxBuffer.resize(vtx_buffer_old_size + vtx_count);
    _VtxWritePtr = VtxBuffer.Data + vtx_buffer_old_size;

    int idx_buffer_old_size = IdxBuffer.Size;
    IdxBuffer.resize(idx_buffer_old_size + idx_count);
    _IdxWritePtr = IdxBuffer.Data + idx_buffer_old_size;
}

// Fully unrolled with inline call to keep our debug builds decently fast.
void ImDrawList::PrimRect(const ImVec2& a, const ImVec2& c, ImU32 col)
{
    ImVec2 b(c.x, a.y), d(a.x, c.y), uv(GImGui->FontTexUvWhitePixel);
    ImDrawIdx idx = (ImDrawIdx)_VtxCurrentIdx;
    _IdxWritePtr[0] = idx; _IdxWritePtr[1] = (ImDrawIdx)(idx+1); _IdxWritePtr[2] = (ImDrawIdx)(idx+2);
    _IdxWritePtr[3] = idx; _IdxWritePtr[4] = (ImDrawIdx)(idx+2); _IdxWritePtr[5] = (ImDrawIdx)(idx+3);
    _VtxWritePtr[0].pos = a; _VtxWritePtr[0].uv = uv; _VtxWritePtr[0].col = col;
    _VtxWritePtr[1].pos = b; _VtxWritePtr[1].uv = uv; _VtxWritePtr[1].col = col;
    _VtxWritePtr[2].pos = c; _VtxWritePtr[2].uv = uv; _VtxWritePtr[2].col = col;
    _VtxWritePtr[3].pos = d; _VtxWritePtr[3].uv = uv; _VtxWritePtr[3].col = col;
    _VtxWritePtr += 4;
    _VtxCurrentIdx += 4;
    _IdxWritePtr += 6;
}

void ImDrawList::PrimRectUV(const ImVec2& a, const ImVec2& c, const ImVec2& uv_a, const ImVec2& uv_c, ImU32 col)
{
    ImVec2 b(c.x, a.y), d(a.x, c.y), uv_b(uv_c.x, uv_a.y), uv_d(uv_a.x, uv_c.y);
    ImDrawIdx idx = (ImDrawIdx)_VtxCurrentIdx;
    _IdxWritePtr[0] = idx; _IdxWritePtr[1] = (ImDrawIdx)(idx+1); _IdxWritePtr[2] = (ImDrawIdx)(idx+2);
    _IdxWritePtr[3] = idx; _IdxWritePtr[4] = (ImDrawIdx)(idx+2); _IdxWritePtr[5] = (ImDrawIdx)(idx+3);
    _VtxWritePtr[0].pos = a; _VtxWritePtr[0].uv = uv_a; _VtxWritePtr[0].col = col;
    _VtxWritePtr[1].pos = b; _VtxWritePtr[1].uv = uv_b; _VtxWritePtr[1].col = col;
    _VtxWritePtr[2].pos = c; _VtxWritePtr[2].uv = uv_c; _VtxWritePtr[2].col = col;
    _VtxWritePtr[3].pos = d; _VtxWritePtr[3].uv = uv_d; _VtxWritePtr[3].col = col;
    _VtxWritePtr += 4;
    _VtxCurrentIdx += 4;
    _IdxWritePtr += 6;
}

void ImDrawList::PrimQuadUV(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& d, const ImVec2& uv_a, const ImVec2& uv_b, const ImVec2& uv_c, const ImVec2& uv_d, ImU32 col)
{
    ImDrawIdx idx = (ImDrawIdx)_VtxCurrentIdx;
    _IdxWritePtr[0] = idx; _IdxWritePtr[1] = (ImDrawIdx)(idx+1); _IdxWritePtr[2] = (ImDrawIdx)(idx+2);
    _IdxWritePtr[3] = idx; _IdxWritePtr[4] = (ImDrawIdx)(idx+2); _IdxWritePtr[5] = (ImDrawIdx)(idx+3);
    _VtxWritePtr[0].pos = a; _VtxWritePtr[0].uv = uv_a; _VtxWritePtr[0].col = col;
    _VtxWritePtr[1].pos = b; _VtxWritePtr[1].uv = uv_b; _VtxWritePtr[1].col = col;
    _VtxWritePtr[2].pos = c; _VtxWritePtr[2].uv = uv_c; _VtxWritePtr[2].col = col;
    _VtxWritePtr[3].pos = d; _VtxWritePtr[3].uv = uv_d; _VtxWritePtr[3].col = col;
    _VtxWritePtr += 4;
    _VtxCurrentIdx += 4;
    _IdxWritePtr += 6;
}

// TODO: Thickness anti-aliased lines cap are missing their AA fringe.
void ImDrawList::AddPolyline(const ImVec2* points, const int points_count, ImU32 col, bool closed, float thickness, bool anti_aliased)
{
    if (points_count < 2)
        return;

    const ImVec2 uv = GImGui->FontTexUvWhitePixel;
    anti_aliased &= GImGui->Style.AntiAliasedLines;
    //if (ImGui::GetIO().KeyCtrl) anti_aliased = false; // Debug

    int count = points_count;
    if (!closed)
        count = points_count-1;

    const bool thick_line = thickness > 1.0f;
    if (anti_aliased)
    {
        // Anti-aliased stroke
        const float AA_SIZE = 1.0f;
        const ImU32 col_trans = col & ~IM_COL32_A_MASK;

        const int idx_count = thick_line ? count*18 : count*12;
        const int vtx_count = thick_line ? points_count*4 : points_count*3;
        PrimReserve(idx_count, vtx_count);

        // Temporary buffer
        ImVec2* temp_normals = (ImVec2*)alloca(points_count * (thick_line ? 5 : 3) * sizeof(ImVec2));
        ImVec2* temp_points = temp_normals + points_count;

        for (int i1 = 0; i1 < count; i1++)
        {
            const int i2 = (i1+1) == points_count ? 0 : i1+1;
            ImVec2 diff = points[i2] - points[i1];
            diff *= ImInvLength(diff, 1.0f);
            temp_normals[i1].x = diff.y;
            temp_normals[i1].y = -diff.x;
        }
        if (!closed)
            temp_normals[points_count-1] = temp_normals[points_count-2];

        if (!thick_line)
        {
            if (!closed)
            {
                temp_points[0] = points[0] + temp_normals[0] * AA_SIZE;
                temp_points[1] = points[0] - temp_normals[0] * AA_SIZE;
                temp_points[(points_count-1)*2+0] = points[points_count-1] + temp_normals[points_count-1] * AA_SIZE;
                temp_points[(points_count-1)*2+1] = points[points_count-1] - temp_normals[points_count-1] * AA_SIZE;
            }

            // FIXME-OPT: Merge the different loops, possibly remove the temporary buffer.
            unsigned int idx1 = _VtxCurrentIdx;
            for (int i1 = 0; i1 < count; i1++)
            {
                const int i2 = (i1+1) == points_count ? 0 : i1+1;
                unsigned int idx2 = (i1+1) == points_count ? _VtxCurrentIdx : idx1+3;

                // Average normals
                ImVec2 dm = (temp_normals[i1] + temp_normals[i2]) * 0.5f;
                float dmr2 = dm.x*dm.x + dm.y*dm.y;
                if (dmr2 > 0.000001f)
                {
                    float scale = 1.0f / dmr2;
                    if (scale > 100.0f) scale = 100.0f;
                    dm *= scale;
                }
                dm *= AA_SIZE;
                temp_points[i2*2+0] = points[i2] + dm;
                temp_points[i2*2+1] = points[i2] - dm;

                // Add indexes
                _IdxWritePtr[0] = (ImDrawIdx)(idx2+0); _IdxWritePtr[1] = (ImDrawIdx)(idx1+0); _IdxWritePtr[2] = (ImDrawIdx)(idx1+2);
                _IdxWritePtr[3] = (ImDrawIdx)(idx1+2); _IdxWritePtr[4] = (ImDrawIdx)(idx2+2); _IdxWritePtr[5] = (ImDrawIdx)(idx2+0);
                _IdxWritePtr[6] = (ImDrawIdx)(idx2+1); _IdxWritePtr[7] = (ImDrawIdx)(idx1+1); _IdxWritePtr[8] = (ImDrawIdx)(idx1+0);
                _IdxWritePtr[9] = (ImDrawIdx)(idx1+0); _IdxWritePtr[10]= (ImDrawIdx)(idx2+0); _IdxWritePtr[11]= (ImDrawIdx)(idx2+1);
                _IdxWritePtr += 12;

                idx1 = idx2;
            }

            // Add vertexes
            for (int i = 0; i < points_count; i++)
            {
                _VtxWritePtr[0].pos = points[i];          _VtxWritePtr[0].uv = uv; _VtxWritePtr[0].col = col;
                _VtxWritePtr[1].pos = temp_points[i*2+0]; _VtxWritePtr[1].uv = uv; _VtxWritePtr[1].col = col_trans;
                _VtxWritePtr[2].pos = temp_points[i*2+1]; _VtxWritePtr[2].uv = uv; _VtxWritePtr[2].col = col_trans;
                _VtxWritePtr += 3;
            }
        }
        else
        {
            const float half_inner_thickness = (thickness - AA_SIZE) * 0.5f;
            if (!closed)
            {
                temp_points[0] = points[0] + temp_normals[0] * (half_inner_thickness + AA_SIZE);
                temp_points[1] = points[0] + temp_normals[0] * (half_inner_thickness);
                temp_points[2] = points[0] - temp_normals[0] * (half_inner_thickness);
                temp_points[3] = points[0] - temp_normals[0] * (half_inner_thickness + AA_SIZE);
                temp_points[(points_count-1)*4+0] = points[points_count-1] + temp_normals[points_count-1] * (half_inner_thickness + AA_SIZE);
                temp_points[(points_count-1)*4+1] = points[points_count-1] + temp_normals[points_count-1] * (half_inner_thickness);
                temp_points[(points_count-1)*4+2] = points[points_count-1] - temp_normals[points_count-1] * (half_inner_thickness);
                temp_points[(points_count-1)*4+3] = points[points_count-1] - temp_normals[points_count-1] * (half_inner_thickness + AA_SIZE);
            }

            // FIXME-OPT: Merge the different loops, possibly remove the temporary buffer.
            unsigned int idx1 = _VtxCurrentIdx;
            for (int i1 = 0; i1 < count; i1++)
            {
                const int i2 = (i1+1) == points_count ? 0 : i1+1;
                unsigned int idx2 = (i1+1) == points_count ? _VtxCurrentIdx : idx1+4;

                // Average normals
                ImVec2 dm = (temp_normals[i1] + temp_normals[i2]) * 0.5f;
                float dmr2 = dm.x*dm.x + dm.y*dm.y;
                if (dmr2 > 0.000001f)
                {
                    float scale = 1.0f / dmr2;
                    if (scale > 100.0f) scale = 100.0f;
                    dm *= scale;
                }
                ImVec2 dm_out = dm * (half_inner_thickness + AA_SIZE);
                ImVec2 dm_in = dm * half_inner_thickness;
                temp_points[i2*4+0] = points[i2] + dm_out;
                temp_points[i2*4+1] = points[i2] + dm_in;
                temp_points[i2*4+2] = points[i2] - dm_in;
                temp_points[i2*4+3] = points[i2] - dm_out;

                // Add indexes
                _IdxWritePtr[0]  = (ImDrawIdx)(idx2+1); _IdxWritePtr[1]  = (ImDrawIdx)(idx1+1); _IdxWritePtr[2]  = (ImDrawIdx)(idx1+2);
                _IdxWritePtr[3]  = (ImDrawIdx)(idx1+2); _IdxWritePtr[4]  = (ImDrawIdx)(idx2+2); _IdxWritePtr[5]  = (ImDrawIdx)(idx2+1);
                _IdxWritePtr[6]  = (ImDrawIdx)(idx2+1); _IdxWritePtr[7]  = (ImDrawIdx)(idx1+1); _IdxWritePtr[8]  = (ImDrawIdx)(idx1+0);
                _IdxWritePtr[9]  = (ImDrawIdx)(idx1+0); _IdxWritePtr[10] = (ImDrawIdx)(idx2+0); _IdxWritePtr[11] = (ImDrawIdx)(idx2+1);
                _IdxWritePtr[12] = (ImDrawIdx)(idx2+2); _IdxWritePtr[13] = (ImDrawIdx)(idx1+2); _IdxWritePtr[14] = (ImDrawIdx)(idx1+3);
                _IdxWritePtr[15] = (ImDrawIdx)(idx1+3); _IdxWritePtr[16] = (ImDrawIdx)(idx2+3); _IdxWritePtr[17] = (ImDrawIdx)(idx2+2);
                _IdxWritePtr += 18;

                idx1 = idx2;
            }

            // Add vertexes
            for (int i = 0; i < points_count; i++)
            {
                _VtxWritePtr[0].pos = temp_points[i*4+0]; _VtxWritePtr[0].uv = uv; _VtxWritePtr[0].col = col_trans;
                _VtxWritePtr[1].pos = temp_points[i*4+1]; _VtxWritePtr[1].uv = uv; _VtxWritePtr[1].col = col;
                _VtxWritePtr[2].pos = temp_points[i*4+2]; _VtxWritePtr[2].uv = uv; _VtxWritePtr[2].col = col;
                _VtxWritePtr[3].pos = temp_points[i*4+3]; _VtxWritePtr[3].uv = uv; _VtxWritePtr[3].col = col_trans;
                _VtxWritePtr += 4;
            }
        }
        _VtxCurrentIdx += (ImDrawIdx)vtx_count;
    }
    else
    {
        // Non Anti-aliased Stroke
        const int idx_count = count*6;
        const int vtx_count = count*4;      // FIXME-OPT: Not sharing edges
        PrimReserve(idx_count, vtx_count);

        for (int i1 = 0; i1 < count; i1++)
        {
            const int i2 = (i1+1) == points_count ? 0 : i1+1;
            const ImVec2& p1 = points[i1];
            const ImVec2& p2 = points[i2];
            ImVec2 diff = p2 - p1;
            diff *= ImInvLength(diff, 1.0f);

            const float dx = diff.x * (thickness * 0.5f);
            const float dy = diff.y * (thickness * 0.5f);
            _VtxWritePtr[0].pos.x = p1.x + dy; _VtxWritePtr[0].pos.y = p1.y - dx; _VtxWritePtr[0].uv = uv; _VtxWritePtr[0].col = col;
            _VtxWritePtr[1].pos.x = p2.x + dy; _VtxWritePtr[1].pos.y = p2.y - dx; _VtxWritePtr[1].uv = uv; _VtxWritePtr[1].col = col;
            _VtxWritePtr[2].pos.x = p2.x - dy; _VtxWritePtr[2].pos.y = p2.y + dx; _VtxWritePtr[2].uv = uv; _VtxWritePtr[2].col = col;
            _VtxWritePtr[3].pos.x = p1.x - dy; _VtxWritePtr[3].pos.y = p1.y + dx; _VtxWritePtr[3].uv = uv; _VtxWritePtr[3].col = col;
            _VtxWritePtr += 4;

            _IdxWritePtr[0] = (ImDrawIdx)(_VtxCurrentIdx); _IdxWritePtr[1] = (ImDrawIdx)(_VtxCurrentIdx+1); _IdxWritePtr[2] = (ImDrawIdx)(_VtxCurrentIdx+2);
            _IdxWritePtr[3] = (ImDrawIdx)(_VtxCurrentIdx); _IdxWritePtr[4] = (ImDrawIdx)(_VtxCurrentIdx+2); _IdxWritePtr[5] = (ImDrawIdx)(_VtxCurrentIdx+3);
            _IdxWritePtr += 6;
            _VtxCurrentIdx += 4;
        }
    }
}

void ImDrawList::AddConvexPolyFilled(const ImVec2* points, const int points_count, ImU32 col, bool anti_aliased)
{
    const ImVec2 uv = GImGui->FontTexUvWhitePixel;
    anti_aliased &= GImGui->Style.AntiAliasedShapes;
    //if (ImGui::GetIO().KeyCtrl) anti_aliased = false; // Debug

    if (anti_aliased)
    {
        // Anti-aliased Fill
        const float AA_SIZE = 1.0f;
        const ImU32 col_trans = col & ~IM_COL32_A_MASK;
        const int idx_count = (points_count-2)*3 + points_count*6;
        const int vtx_count = (points_count*2);
        PrimReserve(idx_count, vtx_count);

        // Add indexes for fill
        unsigned int vtx_inner_idx = _VtxCurrentIdx;
        unsigned int vtx_outer_idx = _VtxCurrentIdx+1;
        for (int i = 2; i < points_count; i++)
        {
            _IdxWritePtr[0] = (ImDrawIdx)(vtx_inner_idx); _IdxWritePtr[1] = (ImDrawIdx)(vtx_inner_idx+((i-1)<<1)); _IdxWritePtr[2] = (ImDrawIdx)(vtx_inner_idx+(i<<1));
            _IdxWritePtr += 3;
        }

        // Compute normals
        ImVec2* temp_normals = (ImVec2*)alloca(points_count * sizeof(ImVec2));
        for (int i0 = points_count-1, i1 = 0; i1 < points_count; i0 = i1++)
        {
            const ImVec2& p0 = points[i0];
            const ImVec2& p1 = points[i1];
            ImVec2 diff = p1 - p0;
            diff *= ImInvLength(diff, 1.0f);
            temp_normals[i0].x = diff.y;
            temp_normals[i0].y = -diff.x;
        }

        for (int i0 = points_count-1, i1 = 0; i1 < points_count; i0 = i1++)
        {
            // Average normals
            const ImVec2& n0 = temp_normals[i0];
            const ImVec2& n1 = temp_normals[i1];
            ImVec2 dm = (n0 + n1) * 0.5f;
            float dmr2 = dm.x*dm.x + dm.y*dm.y;
            if (dmr2 > 0.000001f)
            {
                float scale = 1.0f / dmr2;
                if (scale > 100.0f) scale = 100.0f;
                dm *= scale;
            }
            dm *= AA_SIZE * 0.5f;

            // Add vertices
            _VtxWritePtr[0].pos = (points[i1] - dm); _VtxWritePtr[0].uv = uv; _VtxWritePtr[0].col = col;        // Inner
            _VtxWritePtr[1].pos = (points[i1] + dm); _VtxWritePtr[1].uv = uv; _VtxWritePtr[1].col = col_trans;  // Outer
            _VtxWritePtr += 2;

            // Add indexes for fringes
            _IdxWritePtr[0] = (ImDrawIdx)(vtx_inner_idx+(i1<<1)); _IdxWritePtr[1] = (ImDrawIdx)(vtx_inner_idx+(i0<<1)); _IdxWritePtr[2] = (ImDrawIdx)(vtx_outer_idx+(i0<<1));
            _IdxWritePtr[3] = (ImDrawIdx)(vtx_outer_idx+(i0<<1)); _IdxWritePtr[4] = (ImDrawIdx)(vtx_outer_idx+(i1<<1)); _IdxWritePtr[5] = (ImDrawIdx)(vtx_inner_idx+(i1<<1));
            _IdxWritePtr += 6;
        }
        _VtxCurrentIdx += (ImDrawIdx)vtx_count;
    }
    else
    {
        // Non Anti-aliased Fill
        const int idx_count = (points_count-2)*3;
        const int vtx_count = points_count;
        PrimReserve(idx_count, vtx_count);
        for (int i = 0; i < vtx_count; i++)
        {
            _VtxWritePtr[0].pos = points[i]; _VtxWritePtr[0].uv = uv; _VtxWritePtr[0].col = col;
            _VtxWritePtr++;
        }
        for (int i = 2; i < points_count; i++)
        {
            _IdxWritePtr[0] = (ImDrawIdx)(_VtxCurrentIdx); _IdxWritePtr[1] = (ImDrawIdx)(_VtxCurrentIdx+i-1); _IdxWritePtr[2] = (ImDrawIdx)(_VtxCurrentIdx+i);
            _IdxWritePtr += 3;
        }
        _VtxCurrentIdx += (ImDrawIdx)vtx_count;
    }
}

void ImDrawList::PathArcToFast(const ImVec2& centre, float radius, int a_min_of_12, int a_max_of_12)
{
    static ImVec2 circle_vtx[12];
    static bool circle_vtx_builds = false;
    const int circle_vtx_count = IM_ARRAYSIZE(circle_vtx);
    if (!circle_vtx_builds)
    {
        for (int i = 0; i < circle_vtx_count; i++)
        {
            const float a = ((float)i / (float)circle_vtx_count) * 2*IM_PI;
            circle_vtx[i].x = cosf(a);
            circle_vtx[i].y = sinf(a);
        }
        circle_vtx_builds = true;
    }

    if (radius == 0.0f || a_min_of_12 > a_max_of_12)
    {
        _Path.push_back(centre);
        return;
    }
    _Path.reserve(_Path.Size + (a_max_of_12 - a_min_of_12 + 1));
    for (int a = a_min_of_12; a <= a_max_of_12; a++)
    {
        const ImVec2& c = circle_vtx[a % circle_vtx_count];
        _Path.push_back(ImVec2(centre.x + c.x * radius, centre.y + c.y * radius));
    }
}

void ImDrawList::PathArcTo(const ImVec2& centre, float radius, float a_min, float a_max, int num_segments)
{
    if (radius == 0.0f)
    {
        _Path.push_back(centre);
        return;
    }
    _Path.reserve(_Path.Size + (num_segments + 1));
    for (int i = 0; i <= num_segments; i++)
    {
        const float a = a_min + ((float)i / (float)num_segments) * (a_max - a_min);
        _Path.push_back(ImVec2(centre.x + cosf(a) * radius, centre.y + sinf(a) * radius));
    }
}

static void PathBezierToCasteljau(ImVector<ImVec2>* path, float x1, float y1, float x2, float y2, float x3, float y3, float x4, float y4, float tess_tol, int level)
{
    float dx = x4 - x1;
    float dy = y4 - y1;
    float d2 = ((x2 - x4) * dy - (y2 - y4) * dx);
    float d3 = ((x3 - x4) * dy - (y3 - y4) * dx);
    d2 = (d2 >= 0) ? d2 : -d2;
    d3 = (d3 >= 0) ? d3 : -d3;
    if ((d2+d3) * (d2+d3) < tess_tol * (dx*dx + dy*dy))
    {
        path->push_back(ImVec2(x4, y4));
    }
    else if (level < 10)
    {
        float x12 = (x1+x2)*0.5f,       y12 = (y1+y2)*0.5f;
        float x23 = (x2+x3)*0.5f,       y23 = (y2+y3)*0.5f;
        float x34 = (x3+x4)*0.5f,       y34 = (y3+y4)*0.5f;
        float x123 = (x12+x23)*0.5f,    y123 = (y12+y23)*0.5f;
        float x234 = (x23+x34)*0.5f,    y234 = (y23+y34)*0.5f;
        float x1234 = (x123+x234)*0.5f, y1234 = (y123+y234)*0.5f;

        PathBezierToCasteljau(path, x1,y1,        x12,y12,    x123,y123,  x1234,y1234, tess_tol, level+1);
        PathBezierToCasteljau(path, x1234,y1234,  x234,y234,  x34,y34,    x4,y4,       tess_tol, level+1);
    }
}

void ImDrawList::PathBezierCurveTo(const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, int num_segments)
{
    ImVec2 p1 = _Path.back();
    if (num_segments == 0)
    {
        // Auto-tessellated
        PathBezierToCasteljau(&_Path, p1.x, p1.y, p2.x, p2.y, p3.x, p3.y, p4.x, p4.y, GImGui->Style.CurveTessellationTol, 0);
    }
    else
    {
        float t_step = 1.0f / (float)num_segments;
        for (int i_step = 1; i_step <= num_segments; i_step++)
        {
            float t = t_step * i_step;
            float u = 1.0f - t;
            float w1 = u*u*u;
            float w2 = 3*u*u*t;
            float w3 = 3*u*t*t;
            float w4 = t*t*t;
            _Path.push_back(ImVec2(w1*p1.x + w2*p2.x + w3*p3.x + w4*p4.x, w1*p1.y + w2*p2.y + w3*p3.y + w4*p4.y));
        }
    }
}

void ImDrawList::PathRect(const ImVec2& a, const ImVec2& b, float rounding, int rounding_corners)
{
    const int corners_top = ImGuiCorner_TopLeft | ImGuiCorner_TopRight;
    const int corners_bottom = ImGuiCorner_BotLeft | ImGuiCorner_BotRight;
    const int corners_left = ImGuiCorner_TopLeft | ImGuiCorner_BotLeft;
    const int corners_right = ImGuiCorner_TopRight | ImGuiCorner_BotRight;

    rounding = ImMin(rounding, fabsf(b.x - a.x) * ( ((rounding_corners & corners_top)  == corners_top)  || ((rounding_corners & corners_bottom) == corners_bottom) ? 0.5f : 1.0f ) - 1.0f);
    rounding = ImMin(rounding, fabsf(b.y - a.y) * ( ((rounding_corners & corners_left) == corners_left) || ((rounding_corners & corners_right)  == corners_right)  ? 0.5f : 1.0f ) - 1.0f);

    if (rounding <= 0.0f || rounding_corners == 0)
    {
        PathLineTo(a);
        PathLineTo(ImVec2(b.x, a.y));
        PathLineTo(b);
        PathLineTo(ImVec2(a.x, b.y));
    }
    else
    {
        const float rounding_tl = (rounding_corners & ImGuiCorner_TopLeft) ? rounding : 0.0f;
        const float rounding_tr = (rounding_corners & ImGuiCorner_TopRight) ? rounding : 0.0f;
        const float rounding_br = (rounding_corners & ImGuiCorner_BotRight) ? rounding : 0.0f;
        const float rounding_bl = (rounding_corners & ImGuiCorner_BotLeft) ? rounding : 0.0f;
        PathArcToFast(ImVec2(a.x + rounding_tl, a.y + rounding_tl), rounding_tl, 6, 9);
        PathArcToFast(ImVec2(b.x - rounding_tr, a.y + rounding_tr), rounding_tr, 9, 12);
        PathArcToFast(ImVec2(b.x - rounding_br, b.y - rounding_br), rounding_br, 0, 3);
        PathArcToFast(ImVec2(a.x + rounding_bl, b.y - rounding_bl), rounding_bl, 3, 6);
    }
}

void ImDrawList::AddLine(const ImVec2& a, const ImVec2& b, ImU32 col, float thickness)
{
    if ((col & IM_COL32_A_MASK) == 0)
        return;
    PathLineTo(a + ImVec2(0.5f,0.5f));
    PathLineTo(b + ImVec2(0.5f,0.5f));
    PathStroke(col, false, thickness);
}

// a: upper-left, b: lower-right. we don't render 1 px sized rectangles properly.
void ImDrawList::AddRect(const ImVec2& a, const ImVec2& b, ImU32 col, float rounding, int rounding_corners_flags, float thickness)
{
    if ((col & IM_COL32_A_MASK) == 0)
        return;
    PathRect(a + ImVec2(0.5f,0.5f), b - ImVec2(0.5f,0.5f), rounding, rounding_corners_flags);
    PathStroke(col, true, thickness);
}

void ImDrawList::AddRectFilled(const ImVec2& a, const ImVec2& b, ImU32 col, float rounding, int rounding_corners_flags)
{
    if ((col & IM_COL32_A_MASK) == 0)
        return;
    if (rounding > 0.0f)
    {
        PathRect(a, b, rounding, rounding_corners_flags);
        PathFillConvex(col);
    }
    else
    {
        PrimReserve(6, 4);
        PrimRect(a, b, col);
    }
}

void ImDrawList::AddRectFilledMultiColor(const ImVec2& a, const ImVec2& c, ImU32 col_upr_left, ImU32 col_upr_right, ImU32 col_bot_right, ImU32 col_bot_left)
{
    if (((col_upr_left | col_upr_right | col_bot_right | col_bot_left) & IM_COL32_A_MASK) == 0)
        return;

    const ImVec2 uv = GImGui->FontTexUvWhitePixel;
    PrimReserve(6, 4);
    PrimWriteIdx((ImDrawIdx)(_VtxCurrentIdx)); PrimWriteIdx((ImDrawIdx)(_VtxCurrentIdx+1)); PrimWriteIdx((ImDrawIdx)(_VtxCurrentIdx+2));
    PrimWriteIdx((ImDrawIdx)(_VtxCurrentIdx)); PrimWriteIdx((ImDrawIdx)(_VtxCurrentIdx+2)); PrimWriteIdx((ImDrawIdx)(_VtxCurrentIdx+3));
    PrimWriteVtx(a, uv, col_upr_left);
    PrimWriteVtx(ImVec2(c.x, a.y), uv, col_upr_right);
    PrimWriteVtx(c, uv, col_bot_right);
    PrimWriteVtx(ImVec2(a.x, c.y), uv, col_bot_left);
}

void ImDrawList::AddQuad(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& d, ImU32 col, float thickness)
{
    if ((col & IM_COL32_A_MASK) == 0)
        return;

    PathLineTo(a);
    PathLineTo(b);
    PathLineTo(c);
    PathLineTo(d);
    PathStroke(col, true, thickness);
}

void ImDrawList::AddQuadFilled(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& d, ImU32 col)
{
    if ((col & IM_COL32_A_MASK) == 0)
        return;

    PathLineTo(a);
    PathLineTo(b);
    PathLineTo(c);
    PathLineTo(d);
    PathFillConvex(col);
}

void ImDrawList::AddTriangle(const ImVec2& a, const ImVec2& b, const ImVec2& c, ImU32 col, float thickness)
{
    if ((col & IM_COL32_A_MASK) == 0)
        return;

    PathLineTo(a);
    PathLineTo(b);
    PathLineTo(c);
    PathStroke(col, true, thickness);
}

void ImDrawList::AddTriangleFilled(const ImVec2& a, const ImVec2& b, const ImVec2& c, ImU32 col)
{
    if ((col & IM_COL32_A_MASK) == 0)
        return;

    PathLineTo(a);
    PathLineTo(b);
    PathLineTo(c);
    PathFillConvex(col);
}

void ImDrawList::AddCircle(const ImVec2& centre, float radius, ImU32 col, int num_segments, float thickness)
{
    if ((col & IM_COL32_A_MASK) == 0)
        return;

    const float a_max = IM_PI*2.0f * ((float)num_segments - 1.0f) / (float)num_segments;
    PathArcTo(centre, radius-0.5f, 0.0f, a_max, num_segments);
    PathStroke(col, true, thickness);
}

void ImDrawList::AddCircleFilled(const ImVec2& centre, float radius, ImU32 col, int num_segments)
{
    if ((col & IM_COL32_A_MASK) == 0)
        return;

    const float a_max = IM_PI*2.0f * ((float)num_segments - 1.0f) / (float)num_segments;
    PathArcTo(centre, radius, 0.0f, a_max, num_segments);
    PathFillConvex(col);
}

void ImDrawList::AddBezierCurve(const ImVec2& pos0, const ImVec2& cp0, const ImVec2& cp1, const ImVec2& pos1, ImU32 col, float thickness, int num_segments)
{
    if ((col & IM_COL32_A_MASK) == 0)
        return;

    PathLineTo(pos0);
    PathBezierCurveTo(cp0, cp1, pos1, num_segments);
    PathStroke(col, false, thickness);
}

void ImDrawList::AddText(const ImFont* font, float font_size, const ImVec2& pos, ImU32 col, const char* text_begin, const char* text_end, float wrap_width, const ImVec4* cpu_fine_clip_rect)
{
    if ((col & IM_COL32_A_MASK) == 0)
        return;

    if (text_end == NULL)
        text_end = text_begin + strlen(text_begin);
    if (text_begin == text_end)
        return;

    // IMPORTANT: This is one of the few instance of breaking the encapsulation of ImDrawList, as we pull this from ImGui state, but it is just SO useful.
    // Might just move Font/FontSize to ImDrawList?
    if (font == NULL)
        font = GImGui->Font;
    if (font_size == 0.0f)
        font_size = GImGui->FontSize;

    IM_ASSERT(font->ContainerAtlas->TexID == _TextureIdStack.back());  // Use high-level ImGui::PushFont() or low-level ImDrawList::PushTextureId() to change font.

    ImVec4 clip_rect = _ClipRectStack.back();
    if (cpu_fine_clip_rect)
    {
        clip_rect.x = ImMax(clip_rect.x, cpu_fine_clip_rect->x);
        clip_rect.y = ImMax(clip_rect.y, cpu_fine_clip_rect->y);
        clip_rect.z = ImMin(clip_rect.z, cpu_fine_clip_rect->z);
        clip_rect.w = ImMin(clip_rect.w, cpu_fine_clip_rect->w);
    }
    font->RenderText(this, font_size, pos, col, clip_rect, text_begin, text_end, wrap_width, cpu_fine_clip_rect != NULL);
}

void ImDrawList::AddText(const ImVec2& pos, ImU32 col, const char* text_begin, const char* text_end)
{
    AddText(NULL, 0.0f, pos, col, text_begin, text_end);
}

void ImDrawList::AddImage(ImTextureID user_texture_id, const ImVec2& a, const ImVec2& b, const ImVec2& uv_a, const ImVec2& uv_b, ImU32 col)
{
    if ((col & IM_COL32_A_MASK) == 0)
        return;

    // FIXME-OPT: This is wasting draw calls.
    const bool push_texture_id = _TextureIdStack.empty() || user_texture_id != _TextureIdStack.back();
    if (push_texture_id)
        PushTextureID(user_texture_id);

    PrimReserve(6, 4);
    PrimRectUV(a, b, uv_a, uv_b, col);

    if (push_texture_id)
        PopTextureID();
}

void ImDrawList::AddImageQuad(ImTextureID user_texture_id, const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& d, const ImVec2& uv_a, const ImVec2& uv_b, const ImVec2& uv_c, const ImVec2& uv_d, ImU32 col)
{
    if ((col & IM_COL32_A_MASK) == 0)
        return;

    const bool push_texture_id = _TextureIdStack.empty() || user_texture_id != _TextureIdStack.back();
    if (push_texture_id)
        PushTextureID(user_texture_id);

    PrimReserve(6, 4);
    PrimQuadUV(a, b, c, d, uv_a, uv_b, uv_c, uv_d, col);

    if (push_texture_id)
        PopTextureID();
}

//-----------------------------------------------------------------------------
// ImDrawData
//-----------------------------------------------------------------------------

// For backward compatibility: convert all buffers from indexed to de-indexed, in case you cannot render indexed. Note: this is slow and most likely a waste of resources. Always prefer indexed rendering!
void ImDrawData::DeIndexAllBuffers()
{
    ImVector<ImDrawVert> new_vtx_buffer;
    TotalVtxCount = TotalIdxCount = 0;
    for (int i = 0; i < CmdListsCount; i++)
    {
        ImDrawList* cmd_list = CmdLists[i];
        if (cmd_list->IdxBuffer.empty())
            continue;
        new_vtx_buffer.resize(cmd_list->IdxBuffer.Size);
        for (int j = 0; j < cmd_list->IdxBuffer.Size; j++)
            new_vtx_buffer[j] = cmd_list->VtxBuffer[cmd_list->IdxBuffer[j]];
        cmd_list->VtxBuffer.swap(new_vtx_buffer);
        cmd_list->IdxBuffer.resize(0);
        TotalVtxCount += cmd_list->VtxBuffer.Size;
    }
}

// Helper to scale the ClipRect field of each ImDrawCmd. Use if your final output buffer is at a different scale than ImGui expects, or if there is a difference between your window resolution and framebuffer resolution.
void ImDrawData::ScaleClipRects(const ImVec2& scale)
{
    for (int i = 0; i < CmdListsCount; i++)
    {
        ImDrawList* cmd_list = CmdLists[i];
        for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
        {
            ImDrawCmd* cmd = &cmd_list->CmdBuffer[cmd_i];
            cmd->ClipRect = ImVec4(cmd->ClipRect.x * scale.x, cmd->ClipRect.y * scale.y, cmd->ClipRect.z * scale.x, cmd->ClipRect.w * scale.y);
        }
    }
}

//-----------------------------------------------------------------------------
// ImFontConfig
//-----------------------------------------------------------------------------

ImFontConfig::ImFontConfig()
{
    FontData = NULL;
    FontDataSize = 0;
    FontDataOwnedByAtlas = true;
    FontNo = 0;
    SizePixels = 0.0f;
    OversampleH = 3;
    OversampleV = 1;
    PixelSnapH = false;
    GlyphExtraSpacing = ImVec2(0.0f, 0.0f);
    GlyphOffset = ImVec2(0.0f, 0.0f);
    GlyphRanges = NULL;
    MergeMode = false;
    RasterizerFlags = 0x00;
    RasterizerMultiply = 1.0f;
    memset(Name, 0, sizeof(Name));
    DstFont = NULL;
}

//-----------------------------------------------------------------------------
// ImFontAtlas
//-----------------------------------------------------------------------------

// A work of art lies ahead! (. = white layer, X = black layer, others are blank)
// The white texels on the top left are the ones we'll use everywhere in ImGui to render filled shapes.
const int FONT_ATLAS_DEFAULT_TEX_DATA_W_HALF = 90;
const int FONT_ATLAS_DEFAULT_TEX_DATA_H      = 27;
const int FONT_ATLAS_DEFAULT_TEX_DATA_ID     = 0xF0000;
const char FONT_ATLAS_DEFAULT_TEX_DATA_PIXELS[FONT_ATLAS_DEFAULT_TEX_DATA_W_HALF * FONT_ATLAS_DEFAULT_TEX_DATA_H + 1] =
{
    "..-         -XXXXXXX-    X    -           X           -XXXXXXX          -          XXXXXXX"
    "..-         -X.....X-   X.X   -          X.X          -X.....X          -          X.....X"
    "---         -XXX.XXX-  X...X  -         X...X         -X....X           -           X....X"
    "X           -  X.X  - X.....X -        X.....X        -X...X            -            X...X"
    "XX          -  X.X  -X.......X-       X.......X       -X..X.X           -           X.X..X"
    "X.X         -  X.X  -XXXX.XXXX-       XXXX.XXXX       -X.X X.X          -          X.X X.X"
    "X..X        -  X.X  -   X.X   -          X.X          -XX   X.X         -         X.X   XX"
    "X...X       -  X.X  -   X.X   -    XX    X.X    XX    -      X.X        -        X.X      "
    "X....X      -  X.X  -   X.X   -   X.X    X.X    X.X   -       X.X       -       X.X       "
    "X.....X     -  X.X  -   X.X   -  X..X    X.X    X..X  -        X.X      -      X.X        "
    "X......X    -  X.X  -   X.X   - X...XXXXXX.XXXXXX...X -         X.X   XX-XX   X.X         "
    "X.......X   -  X.X  -   X.X   -X.....................X-          X.X X.X-X.X X.X          "
    "X........X  -  X.X  -   X.X   - X...XXXXXX.XXXXXX...X -           X.X..X-X..X.X           "
    "X.........X -XXX.XXX-   X.X   -  X..X    X.X    X..X  -            X...X-X...X            "
    "X..........X-X.....X-   X.X   -   X.X    X.X    X.X   -           X....X-X....X           "
    "X......XXXXX-XXXXXXX-   X.X   -    XX    X.X    XX    -          X.....X-X.....X          "
    "X...X..X    ---------   X.X   -          X.X          -          XXXXXXX-XXXXXXX          "
    "X..X X..X   -       -XXXX.XXXX-       XXXX.XXXX       ------------------------------------"
    "X.X  X..X   -       -X.......X-       X.......X       -    XX           XX    -           "
    "XX    X..X  -       - X.....X -        X.....X        -   X.X           X.X   -           "
    "      X..X          -  X...X  -         X...X         -  X..X           X..X  -           "
    "       XX           -   X.X   -          X.X          - X...XXXXXXXXXXXXX...X -           "
    "------------        -    X    -           X           -X.....................X-           "
    "                    ----------------------------------- X...XXXXXXXXXXXXX...X -           "
    "                                                      -  X..X           X..X  -           "
    "                                                      -   X.X           X.X   -           "
    "                                                      -    XX           XX    -           "
};

ImFontAtlas::ImFontAtlas()
{
    TexID = NULL;
    TexPixelsAlpha8 = NULL;
    TexPixelsRGBA32 = NULL;
    TexWidth = TexHeight = TexDesiredWidth = 0;
    TexGlyphPadding = 1;
    TexUvWhitePixel = ImVec2(0, 0);
}

ImFontAtlas::~ImFontAtlas()
{
    Clear();
}

void    ImFontAtlas::ClearInputData()
{
    for (int i = 0; i < ConfigData.Size; i++)
        if (ConfigData[i].FontData && ConfigData[i].FontDataOwnedByAtlas)
        {
            ImGui::MemFree(ConfigData[i].FontData);
            ConfigData[i].FontData = NULL;
        }

    // When clearing this we lose access to the font name and other information used to build the font.
    for (int i = 0; i < Fonts.Size; i++)
        if (Fonts[i]->ConfigData >= ConfigData.Data && Fonts[i]->ConfigData < ConfigData.Data + ConfigData.Size)
        {
            Fonts[i]->ConfigData = NULL;
            Fonts[i]->ConfigDataCount = 0;
        }
    ConfigData.clear();
    CustomRects.clear();
}

void    ImFontAtlas::ClearTexData()
{
    if (TexPixelsAlpha8)
        ImGui::MemFree(TexPixelsAlpha8);
    if (TexPixelsRGBA32)
        ImGui::MemFree(TexPixelsRGBA32);
    TexPixelsAlpha8 = NULL;
    TexPixelsRGBA32 = NULL;
}

void    ImFontAtlas::ClearFonts()
{
    for (int i = 0; i < Fonts.Size; i++)
    {
        Fonts[i]->~ImFont();
        ImGui::MemFree(Fonts[i]);
    }
    Fonts.clear();
}

void    ImFontAtlas::Clear()
{
    ClearInputData();
    ClearTexData();
    ClearFonts();
}

void    ImFontAtlas::GetTexDataAsAlpha8(unsigned char** out_pixels, int* out_width, int* out_height, int* out_bytes_per_pixel)
{
    // Build atlas on demand
    if (TexPixelsAlpha8 == NULL)
    {
        if (ConfigData.empty())
            AddFontDefault();
        Build();
    }

    *out_pixels = TexPixelsAlpha8;
    if (out_width) *out_width = TexWidth;
    if (out_height) *out_height = TexHeight;
    if (out_bytes_per_pixel) *out_bytes_per_pixel = 1;
}

void    ImFontAtlas::GetTexDataAsRGBA32(unsigned char** out_pixels, int* out_width, int* out_height, int* out_bytes_per_pixel)
{
    // Convert to RGBA32 format on demand
    // Although it is likely to be the most commonly used format, our font rendering is 1 channel / 8 bpp
    if (!TexPixelsRGBA32)
    {
        unsigned char* pixels;
        GetTexDataAsAlpha8(&pixels, NULL, NULL);
        TexPixelsRGBA32 = (unsigned int*)ImGui::MemAlloc((size_t)(TexWidth * TexHeight * 4));
        const unsigned char* src = pixels;
        unsigned int* dst = TexPixelsRGBA32;
        for (int n = TexWidth * TexHeight; n > 0; n--)
            *dst++ = IM_COL32(255, 255, 255, (unsigned int)(*src++));
    }

    *out_pixels = (unsigned char*)TexPixelsRGBA32;
    if (out_width) *out_width = TexWidth;
    if (out_height) *out_height = TexHeight;
    if (out_bytes_per_pixel) *out_bytes_per_pixel = 4;
}

ImFont* ImFontAtlas::AddFont(const ImFontConfig* font_cfg)
{
    IM_ASSERT(font_cfg->FontData != NULL && font_cfg->FontDataSize > 0);
    IM_ASSERT(font_cfg->SizePixels > 0.0f);

    // Create new font
    if (!font_cfg->MergeMode)
    {
        ImFont* font = (ImFont*)ImGui::MemAlloc(sizeof(ImFont));
        IM_PLACEMENT_NEW(font) ImFont();
        Fonts.push_back(font);
    }
    else
    {
        IM_ASSERT(!Fonts.empty()); // When using MergeMode make sure that a font has already been added before. You can use ImGui::GetIO().Fonts->AddFontDefault() to add the default imgui font.
    }

    ConfigData.push_back(*font_cfg);
    ImFontConfig& new_font_cfg = ConfigData.back();
    if (!new_font_cfg.DstFont)
        new_font_cfg.DstFont = Fonts.back();
    if (!new_font_cfg.FontDataOwnedByAtlas)
    {
        new_font_cfg.FontData = ImGui::MemAlloc(new_font_cfg.FontDataSize);
        new_font_cfg.FontDataOwnedByAtlas = true;
        memcpy(new_font_cfg.FontData, font_cfg->FontData, (size_t)new_font_cfg.FontDataSize);
    }

    // Invalidate texture
    ClearTexData();
    return new_font_cfg.DstFont;
}

// Default font TTF is compressed with stb_compress then base85 encoded (see extra_fonts/binary_to_compressed_c.cpp for encoder)
static unsigned int stb_decompress_length(unsigned char *input);
static unsigned int stb_decompress(unsigned char *output, unsigned char *i, unsigned int length);
static const char*  GetDefaultCompressedFontDataTTFBase85();
static unsigned int Decode85Byte(char c)                                    { return c >= '\\' ? c-36 : c-35; }
static void         Decode85(const unsigned char* src, unsigned char* dst)
{
    while (*src)
    {
        unsigned int tmp = Decode85Byte(src[0]) + 85*(Decode85Byte(src[1]) + 85*(Decode85Byte(src[2]) + 85*(Decode85Byte(src[3]) + 85*Decode85Byte(src[4]))));
        dst[0] = ((tmp >> 0) & 0xFF); dst[1] = ((tmp >> 8) & 0xFF); dst[2] = ((tmp >> 16) & 0xFF); dst[3] = ((tmp >> 24) & 0xFF);   // We can't assume little-endianness.
        src += 5;
        dst += 4;
    }
}

// Load embedded ProggyClean.ttf at size 13, disable oversampling
ImFont* ImFontAtlas::AddFontDefault(const ImFontConfig* font_cfg_template)
{
    ImFontConfig font_cfg = font_cfg_template ? *font_cfg_template : ImFontConfig();
    if (!font_cfg_template)
    {
        font_cfg.OversampleH = font_cfg.OversampleV = 1;
        font_cfg.PixelSnapH = true;
    }
    if (font_cfg.Name[0] == '\0') strcpy(font_cfg.Name, "ProggyClean.ttf, 13px");
    if (font_cfg.SizePixels <= 0.0f) font_cfg.SizePixels = 13.0f;

    const char* ttf_compressed_base85 = GetDefaultCompressedFontDataTTFBase85();
    ImFont* font = AddFontFromMemoryCompressedBase85TTF(ttf_compressed_base85, font_cfg.SizePixels, &font_cfg, GetGlyphRangesDefault());
    return font;
}

ImFont* ImFontAtlas::AddFontFromFileTTF(const char* filename, float size_pixels, const ImFontConfig* font_cfg_template, const ImWchar* glyph_ranges)
{
    int data_size = 0;
    void* data = ImFileLoadToMemory(filename, "rb", &data_size, 0);
    if (!data)
    {
        IM_ASSERT(0); // Could not load file.
        return NULL;
    }
    ImFontConfig font_cfg = font_cfg_template ? *font_cfg_template : ImFontConfig();
    if (font_cfg.Name[0] == '\0')
    {
        // Store a short copy of filename into into the font name for convenience
        const char* p;
        for (p = filename + strlen(filename); p > filename && p[-1] != '/' && p[-1] != '\\'; p--) {}
        snprintf(font_cfg.Name, IM_ARRAYSIZE(font_cfg.Name), "%s, %.0fpx", p, size_pixels);
    }
    return AddFontFromMemoryTTF(data, data_size, size_pixels, &font_cfg, glyph_ranges);
}

// NBM Transfer ownership of 'ttf_data' to ImFontAtlas, unless font_cfg_template->FontDataOwnedByAtlas == false. Owned TTF buffer will be deleted after Build().
ImFont* ImFontAtlas::AddFontFromMemoryTTF(void* ttf_data, int ttf_size, float size_pixels, const ImFontConfig* font_cfg_template, const ImWchar* glyph_ranges)
{
    ImFontConfig font_cfg = font_cfg_template ? *font_cfg_template : ImFontConfig();
    IM_ASSERT(font_cfg.FontData == NULL);
    font_cfg.FontData = ttf_data;
    font_cfg.FontDataSize = ttf_size;
    font_cfg.SizePixels = size_pixels;
    if (glyph_ranges)
        font_cfg.GlyphRanges = glyph_ranges;
    return AddFont(&font_cfg);
}

ImFont* ImFontAtlas::AddFontFromMemoryCompressedTTF(const void* compressed_ttf_data, int compressed_ttf_size, float size_pixels, const ImFontConfig* font_cfg_template, const ImWchar* glyph_ranges)
{
    const unsigned int buf_decompressed_size = stb_decompress_length((unsigned char*)compressed_ttf_data);
    unsigned char* buf_decompressed_data = (unsigned char *)ImGui::MemAlloc(buf_decompressed_size);
    stb_decompress(buf_decompressed_data, (unsigned char*)compressed_ttf_data, (unsigned int)compressed_ttf_size);

    ImFontConfig font_cfg = font_cfg_template ? *font_cfg_template : ImFontConfig();
    IM_ASSERT(font_cfg.FontData == NULL);
    font_cfg.FontDataOwnedByAtlas = true;
    return AddFontFromMemoryTTF(buf_decompressed_data, (int)buf_decompressed_size, size_pixels, &font_cfg, glyph_ranges);
}

ImFont* ImFontAtlas::AddFontFromMemoryCompressedBase85TTF(const char* compressed_ttf_data_base85, float size_pixels, const ImFontConfig* font_cfg, const ImWchar* glyph_ranges)
{
    int compressed_ttf_size = (((int)strlen(compressed_ttf_data_base85) + 4) / 5) * 4;
    void* compressed_ttf = ImGui::MemAlloc((size_t)compressed_ttf_size);
    Decode85((const unsigned char*)compressed_ttf_data_base85, (unsigned char*)compressed_ttf);
    ImFont* font = AddFontFromMemoryCompressedTTF(compressed_ttf, compressed_ttf_size, size_pixels, font_cfg, glyph_ranges);
    ImGui::MemFree(compressed_ttf);
    return font;
}

int ImFontAtlas::CustomRectRegister(unsigned int id, int width, int height)
{
    IM_ASSERT(width > 0 && width <= 0xFFFF);
    IM_ASSERT(height > 0 && height <= 0xFFFF);
    CustomRect r;
    r.ID = id;
    r.Width = (unsigned short)width;
    r.Height = (unsigned short)height;
    CustomRects.push_back(r);
    return CustomRects.Size - 1; // Return index
}

void ImFontAtlas::CustomRectCalcUV(const CustomRect* rect, ImVec2* out_uv_min, ImVec2* out_uv_max)
{
    IM_ASSERT(TexWidth > 0 && TexHeight > 0);   // Font atlas needs to be built before we can calculate UV coordinates
    IM_ASSERT(rect->IsPacked());                // Make sure the rectangle has been packed
    *out_uv_min = ImVec2((float)rect->X / TexWidth, (float)rect->Y / TexHeight);
    *out_uv_max = ImVec2((float)(rect->X + rect->Width) / TexWidth, (float)(rect->Y + rect->Height) / TexHeight);
}

bool    ImFontAtlas::Build()
{
    return ImFontAtlasBuildWithStbTruetype(this);
}

void    ImFontAtlasBuildMultiplyCalcLookupTable(unsigned char out_table[256], float in_brighten_factor)
{
    for (unsigned int i = 0; i < 256; i++)
    {
        unsigned int value = (unsigned int)(i * in_brighten_factor);
        out_table[i] = value > 255 ? 255 : (value & 0xFF);
    }
}

void    ImFontAtlasBuildMultiplyRectAlpha8(const unsigned char table[256], unsigned char* pixels, int x, int y, int w, int h, int stride)
{
    unsigned char* data = pixels + x + y * stride;
    for (int j = h; j > 0; j--, data += stride)
        for (int i = 0; i < w; i++)
            data[i] = table[data[i]];
}

bool    ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas)
{
    IM_ASSERT(atlas->ConfigData.Size > 0);

    ImFontAtlasBuildRegisterDefaultCustomRects(atlas);

    atlas->TexID = NULL;
    atlas->TexWidth = atlas->TexHeight = 0;
    atlas->TexUvWhitePixel = ImVec2(0, 0);
    atlas->ClearTexData();

    // Count glyphs/ranges
    int total_glyphs_count = 0;
    int total_ranges_count = 0;
    for (int input_i = 0; input_i < atlas->ConfigData.Size; input_i++)
    {
        ImFontConfig& cfg = atlas->ConfigData[input_i];
        if (!cfg.GlyphRanges)
            cfg.GlyphRanges = atlas->GetGlyphRangesDefault();
        for (const ImWchar* in_range = cfg.GlyphRanges; in_range[0] && in_range[1]; in_range += 2, total_ranges_count++)
            total_glyphs_count += (in_range[1] - in_range[0]) + 1;
    }

    // We need a width for the skyline algorithm. Using a dumb heuristic here to decide of width. User can override TexDesiredWidth and TexGlyphPadding if they wish.
    // Width doesn't really matter much, but some API/GPU have texture size limitations and increasing width can decrease height.
    atlas->TexWidth = (atlas->TexDesiredWidth > 0) ? atlas->TexDesiredWidth : (total_glyphs_count > 4000) ? 4096 : (total_glyphs_count > 2000) ? 2048 : (total_glyphs_count > 1000) ? 1024 : 512;
    atlas->TexHeight = 0;

    // Start packing
    const int max_tex_height = 1024*32;
    stbtt_pack_context spc;
    stbtt_PackBegin(&spc, NULL, atlas->TexWidth, max_tex_height, 0, atlas->TexGlyphPadding, NULL);
    stbtt_PackSetOversampling(&spc, 1, 1);

    // Pack our extra data rectangles first, so it will be on the upper-left corner of our texture (UV will have small values).
    ImFontAtlasBuildPackCustomRects(atlas, spc.pack_info);

    // Initialize font information (so we can error without any cleanup)
    struct ImFontTempBuildData
    {
        stbtt_fontinfo      FontInfo;
        stbrp_rect*         Rects;
        int                 RectsCount;
        stbtt_pack_range*   Ranges;
        int                 RangesCount;
    };
    ImFontTempBuildData* tmp_array = (ImFontTempBuildData*)ImGui::MemAlloc((size_t)atlas->ConfigData.Size * sizeof(ImFontTempBuildData));
    for (int input_i = 0; input_i < atlas->ConfigData.Size; input_i++)
    {
        ImFontConfig& cfg = atlas->ConfigData[input_i];
        ImFontTempBuildData& tmp = tmp_array[input_i];
        IM_ASSERT(cfg.DstFont && (!cfg.DstFont->IsLoaded() || cfg.DstFont->ContainerAtlas == atlas));

        const int font_offset = stbtt_GetFontOffsetForIndex((unsigned char*)cfg.FontData, cfg.FontNo);
        IM_ASSERT(font_offset >= 0);
        if (!stbtt_InitFont(&tmp.FontInfo, (unsigned char*)cfg.FontData, font_offset))
            return false;
    }

    // Allocate packing character data and flag packed characters buffer as non-packed (x0=y0=x1=y1=0)
    int buf_packedchars_n = 0, buf_rects_n = 0, buf_ranges_n = 0;
    stbtt_packedchar* buf_packedchars = (stbtt_packedchar*)ImGui::MemAlloc(total_glyphs_count * sizeof(stbtt_packedchar));
    stbrp_rect* buf_rects = (stbrp_rect*)ImGui::MemAlloc(total_glyphs_count * sizeof(stbrp_rect));
    stbtt_pack_range* buf_ranges = (stbtt_pack_range*)ImGui::MemAlloc(total_ranges_count * sizeof(stbtt_pack_range));
    memset(buf_packedchars, 0, total_glyphs_count * sizeof(stbtt_packedchar));
    memset(buf_rects, 0, total_glyphs_count * sizeof(stbrp_rect));              // Unnecessary but let's clear this for the sake of sanity.
    memset(buf_ranges, 0, total_ranges_count * sizeof(stbtt_pack_range));

    // First font pass: pack all glyphs (no rendering at this point, we are working with rectangles in an infinitely tall texture at this point)
    for (int input_i = 0; input_i < atlas->ConfigData.Size; input_i++)
    {
        ImFontConfig& cfg = atlas->ConfigData[input_i];
        ImFontTempBuildData& tmp = tmp_array[input_i];

        // Setup ranges
        int font_glyphs_count = 0;
        int font_ranges_count = 0;
        for (const ImWchar* in_range = cfg.GlyphRanges; in_range[0] && in_range[1]; in_range += 2, font_ranges_count++)
            font_glyphs_count += (in_range[1] - in_range[0]) + 1;
        tmp.Ranges = buf_ranges + buf_ranges_n;
        tmp.RangesCount = font_ranges_count;
        buf_ranges_n += font_ranges_count;
        for (int i = 0; i < font_ranges_count; i++)
        {
            const ImWchar* in_range = &cfg.GlyphRanges[i * 2];
            stbtt_pack_range& range = tmp.Ranges[i];
            range.font_size = cfg.SizePixels;
            range.first_unicode_codepoint_in_range = in_range[0];
            range.num_chars = (in_range[1] - in_range[0]) + 1;
            range.chardata_for_range = buf_packedchars + buf_packedchars_n;
            buf_packedchars_n += range.num_chars;
        }

        // Pack
        tmp.Rects = buf_rects + buf_rects_n;
        tmp.RectsCount = font_glyphs_count;
        buf_rects_n += font_glyphs_count;
        stbtt_PackSetOversampling(&spc, cfg.OversampleH, cfg.OversampleV);
        int n = stbtt_PackFontRangesGatherRects(&spc, &tmp.FontInfo, tmp.Ranges, tmp.RangesCount, tmp.Rects);
        IM_ASSERT(n == font_glyphs_count);
        stbrp_pack_rects((stbrp_context*)spc.pack_info, tmp.Rects, n);

        // Extend texture height
        for (int i = 0; i < n; i++)
            if (tmp.Rects[i].was_packed)
                atlas->TexHeight = ImMax(atlas->TexHeight, tmp.Rects[i].y + tmp.Rects[i].h);
    }
    IM_ASSERT(buf_rects_n == total_glyphs_count);
    IM_ASSERT(buf_packedchars_n == total_glyphs_count);
    IM_ASSERT(buf_ranges_n == total_ranges_count);

    // Create texture
    atlas->TexHeight = ImUpperPowerOfTwo(atlas->TexHeight);
    atlas->TexPixelsAlpha8 = (unsigned char*)ImGui::MemAlloc(atlas->TexWidth * atlas->TexHeight);
    memset(atlas->TexPixelsAlpha8, 0, atlas->TexWidth * atlas->TexHeight);
    spc.pixels = atlas->TexPixelsAlpha8;
    spc.height = atlas->TexHeight;

    // Second pass: render font characters
    for (int input_i = 0; input_i < atlas->ConfigData.Size; input_i++)
    {
        ImFontConfig& cfg = atlas->ConfigData[input_i];
        ImFontTempBuildData& tmp = tmp_array[input_i];
        stbtt_PackSetOversampling(&spc, cfg.OversampleH, cfg.OversampleV);
        stbtt_PackFontRangesRenderIntoRects(&spc, &tmp.FontInfo, tmp.Ranges, tmp.RangesCount, tmp.Rects);
        if (cfg.RasterizerMultiply != 1.0f)
        {
            unsigned char multiply_table[256];
            ImFontAtlasBuildMultiplyCalcLookupTable(multiply_table, cfg.RasterizerMultiply);
            for (const stbrp_rect* r = tmp.Rects; r != tmp.Rects + tmp.RectsCount; r++)
                if (r->was_packed)
                    ImFontAtlasBuildMultiplyRectAlpha8(multiply_table, spc.pixels, r->x, r->y, r->w, r->h, spc.stride_in_bytes);
        }
        tmp.Rects = NULL;
    }

    // End packing
    stbtt_PackEnd(&spc);
    ImGui::MemFree(buf_rects);
    buf_rects = NULL;

    // Third pass: setup ImFont and glyphs for runtime
    for (int input_i = 0; input_i < atlas->ConfigData.Size; input_i++)
    {
        ImFontConfig& cfg = atlas->ConfigData[input_i];
        ImFontTempBuildData& tmp = tmp_array[input_i];
        ImFont* dst_font = cfg.DstFont; // We can have multiple input fonts writing into a same destination font (when using MergeMode=true)

        const float font_scale = stbtt_ScaleForPixelHeight(&tmp.FontInfo, cfg.SizePixels);
        int unscaled_ascent, unscaled_descent, unscaled_line_gap;
        stbtt_GetFontVMetrics(&tmp.FontInfo, &unscaled_ascent, &unscaled_descent, &unscaled_line_gap);

        const float ascent = unscaled_ascent * font_scale;
        const float descent = unscaled_descent * font_scale;
        ImFontAtlasBuildSetupFont(atlas, dst_font, &cfg, ascent, descent);
        const float off_x = cfg.GlyphOffset.x;
        const float off_y = cfg.GlyphOffset.y + (float)(int)(dst_font->Ascent + 0.5f);

        dst_font->FallbackGlyph = NULL; // Always clear fallback so FindGlyph can return NULL. It will be set again in BuildLookupTable()
        for (int i = 0; i < tmp.RangesCount; i++)
        {
            stbtt_pack_range& range = tmp.Ranges[i];
            for (int char_idx = 0; char_idx < range.num_chars; char_idx += 1)
            {
                const stbtt_packedchar& pc = range.chardata_for_range[char_idx];
                if (!pc.x0 && !pc.x1 && !pc.y0 && !pc.y1)
                    continue;

                const int codepoint = range.first_unicode_codepoint_in_range + char_idx;
                if (cfg.MergeMode && dst_font->FindGlyph((unsigned short)codepoint))
                    continue;

                stbtt_aligned_quad q;
                float dummy_x = 0.0f, dummy_y = 0.0f;
                stbtt_GetPackedQuad(range.chardata_for_range, atlas->TexWidth, atlas->TexHeight, char_idx, &dummy_x, &dummy_y, &q, 0);

                dst_font->Glyphs.resize(dst_font->Glyphs.Size + 1);
                ImFont::Glyph& glyph = dst_font->Glyphs.back();
                glyph.Codepoint = (ImWchar)codepoint;
                glyph.X0 = q.x0 + off_x; 
                glyph.Y0 = q.y0 + off_y; 
                glyph.X1 = q.x1 + off_x; 
                glyph.Y1 = q.y1 + off_y;
                glyph.U0 = q.s0; 
                glyph.V0 = q.t0; 
                glyph.U1 = q.s1; 
                glyph.V1 = q.t1;
                glyph.XAdvance = (pc.xadvance + cfg.GlyphExtraSpacing.x);  // Bake spacing into XAdvance

                if (cfg.PixelSnapH)
                    glyph.XAdvance = (float)(int)(glyph.XAdvance + 0.5f);
                dst_font->MetricsTotalSurface += (int)((glyph.U1 - glyph.U0) * atlas->TexWidth + 1.99f) * (int)((glyph.V1 - glyph.V0) * atlas->TexHeight + 1.99f); // +1 to account for average padding, +0.99 to round
            }
        }
        cfg.DstFont->BuildLookupTable();
    }

    // Cleanup temporaries
    ImGui::MemFree(buf_packedchars);
    ImGui::MemFree(buf_ranges);
    ImGui::MemFree(tmp_array);

    // Render into our custom data block
    ImFontAtlasBuildRenderDefaultTexData(atlas);

    return true;
}

void ImFontAtlasBuildRegisterDefaultCustomRects(ImFontAtlas* atlas)
{
    // FIXME-WIP: We should register in the constructor (but cannot because our static instances may not have allocator ready by the time they initialize). This needs to be fixed because we can expose CustomRects.
    if (atlas->CustomRects.empty())
        atlas->CustomRectRegister(FONT_ATLAS_DEFAULT_TEX_DATA_ID, FONT_ATLAS_DEFAULT_TEX_DATA_W_HALF*2+1, FONT_ATLAS_DEFAULT_TEX_DATA_H);
}

void ImFontAtlasBuildSetupFont(ImFontAtlas* atlas, ImFont* font, ImFontConfig* font_config, float ascent, float descent)
{
    if (!font_config->MergeMode)
    {
        font->ContainerAtlas = atlas;
        font->ConfigData = font_config;
        font->ConfigDataCount = 0;
        font->FontSize = font_config->SizePixels;
        font->Ascent = ascent;
        font->Descent = descent;
        font->Glyphs.resize(0);
        font->MetricsTotalSurface = 0;
    }
    font->ConfigDataCount++;
}

void ImFontAtlasBuildPackCustomRects(ImFontAtlas* atlas, void* pack_context_opaque)
{
    stbrp_context* pack_context = (stbrp_context*)pack_context_opaque;

    ImVector<ImFontAtlas::CustomRect>& user_rects = atlas->CustomRects;
    ImVector<stbrp_rect> pack_rects;
    pack_rects.resize(user_rects.Size);
    memset(pack_rects.Data, 0, sizeof(stbrp_rect) * user_rects.Size);
    for (int i = 0; i < user_rects.Size; i++)
    {
        pack_rects[i].w = user_rects[i].Width;
        pack_rects[i].h = user_rects[i].Height;
    }
    stbrp_pack_rects(pack_context, &pack_rects[0], pack_rects.Size);
    for (int i = 0; i < pack_rects.Size; i++)
        if (pack_rects[i].was_packed)
        {
            user_rects[i].X = pack_rects[i].x;
            user_rects[i].Y = pack_rects[i].y;
            IM_ASSERT(pack_rects[i].w == user_rects[i].Width && pack_rects[i].h == user_rects[i].Height);
            atlas->TexHeight = ImMax(atlas->TexHeight, pack_rects[i].y + pack_rects[i].h);
        }
}

void ImFontAtlasBuildRenderDefaultTexData(ImFontAtlas* atlas)
{
    ImFontAtlas::CustomRect& r = atlas->CustomRects[0];
    IM_ASSERT(r.ID == FONT_ATLAS_DEFAULT_TEX_DATA_ID);
    IM_ASSERT(r.Width == FONT_ATLAS_DEFAULT_TEX_DATA_W_HALF*2+1);
    IM_ASSERT(r.Height == FONT_ATLAS_DEFAULT_TEX_DATA_H);
    IM_ASSERT(r.IsPacked());
    IM_ASSERT(atlas->TexPixelsAlpha8 != NULL);

    // Render/copy pixels
    for (int y = 0, n = 0; y < FONT_ATLAS_DEFAULT_TEX_DATA_H; y++)
        for (int x = 0; x < FONT_ATLAS_DEFAULT_TEX_DATA_W_HALF; x++, n++)
        {
            const int offset0 = (int)(r.X + x) + (int)(r.Y + y) * atlas->TexWidth;
            const int offset1 = offset0 + FONT_ATLAS_DEFAULT_TEX_DATA_W_HALF + 1;
            atlas->TexPixelsAlpha8[offset0] = FONT_ATLAS_DEFAULT_TEX_DATA_PIXELS[n] == '.' ? 0xFF : 0x00;
            atlas->TexPixelsAlpha8[offset1] = FONT_ATLAS_DEFAULT_TEX_DATA_PIXELS[n] == 'X' ? 0xFF : 0x00;
        }
    const ImVec2 tex_uv_scale(1.0f / atlas->TexWidth, 1.0f / atlas->TexHeight);
    atlas->TexUvWhitePixel = ImVec2((r.X + 0.5f) * tex_uv_scale.x, (r.Y + 0.5f) * tex_uv_scale.y);

    // Setup mouse cursors
    const ImVec2 cursor_datas[ImGuiMouseCursor_Count_][3] =
    {
        // Pos ........ Size ......... Offset ......
        { ImVec2(0,3),  ImVec2(12,19), ImVec2( 0, 0) }, // ImGuiMouseCursor_Arrow
        { ImVec2(13,0), ImVec2(7,16),  ImVec2( 4, 8) }, // ImGuiMouseCursor_TextInput
        { ImVec2(31,0), ImVec2(23,23), ImVec2(11,11) }, // ImGuiMouseCursor_Move
        { ImVec2(21,0), ImVec2( 9,23), ImVec2( 5,11) }, // ImGuiMouseCursor_ResizeNS
        { ImVec2(55,18),ImVec2(23, 9), ImVec2(11, 5) }, // ImGuiMouseCursor_ResizeEW
        { ImVec2(73,0), ImVec2(17,17), ImVec2( 9, 9) }, // ImGuiMouseCursor_ResizeNESW
        { ImVec2(55,0), ImVec2(17,17), ImVec2( 9, 9) }, // ImGuiMouseCursor_ResizeNWSE
    };

    for (int type = 0; type < ImGuiMouseCursor_Count_; type++)
    {
        ImGuiMouseCursorData& cursor_data = GImGui->MouseCursorData[type];
        ImVec2 pos = cursor_datas[type][0] + ImVec2((float)r.X, (float)r.Y);
        const ImVec2 size = cursor_datas[type][1];
        cursor_data.Type = type;
        cursor_data.Size = size;
        cursor_data.HotOffset = cursor_datas[type][2];
        cursor_data.TexUvMin[0] = (pos) * tex_uv_scale;
        cursor_data.TexUvMax[0] = (pos + size) * tex_uv_scale;
        pos.x += FONT_ATLAS_DEFAULT_TEX_DATA_W_HALF + 1;
        cursor_data.TexUvMin[1] = (pos) * tex_uv_scale;
        cursor_data.TexUvMax[1] = (pos + size) * tex_uv_scale;
    }
}

// Retrieve list of range (2 int per range, values are inclusive)
const ImWchar*   ImFontAtlas::GetGlyphRangesDefault()
{
    static const ImWchar ranges[] =
    {
        0x0020, 0x00FF, // Basic Latin + Latin Supplement
        0,
    };
    return &ranges[0];
}

const ImWchar*  ImFontAtlas::GetGlyphRangesKorean()
{
    static const ImWchar ranges[] =
    {
        0x0020, 0x00FF, // Basic Latin + Latin Supplement
        0x3131, 0x3163, // Korean alphabets
        0xAC00, 0xD79D, // Korean characters
        0,
    };
    return &ranges[0];
}

const ImWchar*  ImFontAtlas::GetGlyphRangesChinese()
{
    static const ImWchar ranges[] =
    {
        0x0020, 0x00FF, // Basic Latin + Latin Supplement
        0x3000, 0x30FF, // Punctuations, Hiragana, Katakana
        0x31F0, 0x31FF, // Katakana Phonetic Extensions
        0xFF00, 0xFFEF, // Half-width characters
        0x4e00, 0x9FAF, // CJK Ideograms
        0,
    };
    return &ranges[0];
}

const ImWchar*  ImFontAtlas::GetGlyphRangesJapanese()
{
    // Store the 1946 ideograms code points as successive offsets from the initial unicode codepoint 0x4E00. Each offset has an implicit +1.
    // This encoding helps us reduce the source code size.
    static const short offsets_from_0x4E00[] =
    {
        -1,0,1,3,0,0,0,0,1,0,5,1,1,0,7,4,6,10,0,1,9,9,7,1,3,19,1,10,7,1,0,1,0,5,1,0,6,4,2,6,0,0,12,6,8,0,3,5,0,1,0,9,0,0,8,1,1,3,4,5,13,0,0,8,2,17,
        4,3,1,1,9,6,0,0,0,2,1,3,2,22,1,9,11,1,13,1,3,12,0,5,9,2,0,6,12,5,3,12,4,1,2,16,1,1,4,6,5,3,0,6,13,15,5,12,8,14,0,0,6,15,3,6,0,18,8,1,6,14,1,
        5,4,12,24,3,13,12,10,24,0,0,0,1,0,1,1,2,9,10,2,2,0,0,3,3,1,0,3,8,0,3,2,4,4,1,6,11,10,14,6,15,3,4,15,1,0,0,5,2,2,0,0,1,6,5,5,6,0,3,6,5,0,0,1,0,
        11,2,2,8,4,7,0,10,0,1,2,17,19,3,0,2,5,0,6,2,4,4,6,1,1,11,2,0,3,1,2,1,2,10,7,6,3,16,0,8,24,0,0,3,1,1,3,0,1,6,0,0,0,2,0,1,5,15,0,1,0,0,2,11,19,
        1,4,19,7,6,5,1,0,0,0,0,5,1,0,1,9,0,0,5,0,2,0,1,0,3,0,11,3,0,2,0,0,0,0,0,9,3,6,4,12,0,14,0,0,29,10,8,0,14,37,13,0,31,16,19,0,8,30,1,20,8,3,48,
        21,1,0,12,0,10,44,34,42,54,11,18,82,0,2,1,2,12,1,0,6,2,17,2,12,7,0,7,17,4,2,6,24,23,8,23,39,2,16,23,1,0,5,1,2,15,14,5,6,2,11,0,8,6,2,2,2,14,
        20,4,15,3,4,11,10,10,2,5,2,1,30,2,1,0,0,22,5,5,0,3,1,5,4,1,0,0,2,2,21,1,5,1,2,16,2,1,3,4,0,8,4,0,0,5,14,11,2,16,1,13,1,7,0,22,15,3,1,22,7,14,
        22,19,11,24,18,46,10,20,64,45,3,2,0,4,5,0,1,4,25,1,0,0,2,10,0,0,0,1,0,1,2,0,0,9,1,2,0,0,0,2,5,2,1,1,5,5,8,1,1,1,5,1,4,9,1,3,0,1,0,1,1,2,0,0,
        2,0,1,8,22,8,1,0,0,0,0,4,2,1,0,9,8,5,0,9,1,30,24,2,6,4,39,0,14,5,16,6,26,179,0,2,1,1,0,0,0,5,2,9,6,0,2,5,16,7,5,1,1,0,2,4,4,7,15,13,14,0,0,
        3,0,1,0,0,0,2,1,6,4,5,1,4,9,0,3,1,8,0,0,10,5,0,43,0,2,6,8,4,0,2,0,0,9,6,0,9,3,1,6,20,14,6,1,4,0,7,2,3,0,2,0,5,0,3,1,0,3,9,7,0,3,4,0,4,9,1,6,0,
        9,0,0,2,3,10,9,28,3,6,2,4,1,2,32,4,1,18,2,0,3,1,5,30,10,0,2,2,2,0,7,9,8,11,10,11,7,2,13,7,5,10,0,3,40,2,0,1,6,12,0,4,5,1,5,11,11,21,4,8,3,7,
        8,8,33,5,23,0,0,19,8,8,2,3,0,6,1,1,1,5,1,27,4,2,5,0,3,5,6,3,1,0,3,1,12,5,3,3,2,0,7,7,2,1,0,4,0,1,1,2,0,10,10,6,2,5,9,7,5,15,15,21,6,11,5,20,
        4,3,5,5,2,5,0,2,1,0,1,7,28,0,9,0,5,12,5,5,18,30,0,12,3,3,21,16,25,32,9,3,14,11,24,5,66,9,1,2,0,5,9,1,5,1,8,0,8,3,3,0,1,15,1,4,8,1,2,7,0,7,2,
        8,3,7,5,3,7,10,2,1,0,0,2,25,0,6,4,0,10,0,4,2,4,1,12,5,38,4,0,4,1,10,5,9,4,0,14,4,2,5,18,20,21,1,3,0,5,0,7,0,3,7,1,3,1,1,8,1,0,0,0,3,2,5,2,11,
        6,0,13,1,3,9,1,12,0,16,6,2,1,0,2,1,12,6,13,11,2,0,28,1,7,8,14,13,8,13,0,2,0,5,4,8,10,2,37,42,19,6,6,7,4,14,11,18,14,80,7,6,0,4,72,12,36,27,
        7,7,0,14,17,19,164,27,0,5,10,7,3,13,6,14,0,2,2,5,3,0,6,13,0,0,10,29,0,4,0,3,13,0,3,1,6,51,1,5,28,2,0,8,0,20,2,4,0,25,2,10,13,10,0,16,4,0,1,0,
        2,1,7,0,1,8,11,0,0,1,2,7,2,23,11,6,6,4,16,2,2,2,0,22,9,3,3,5,2,0,15,16,21,2,9,20,15,15,5,3,9,1,0,0,1,7,7,5,4,2,2,2,38,24,14,0,0,15,5,6,24,14,
        5,5,11,0,21,12,0,3,8,4,11,1,8,0,11,27,7,2,4,9,21,59,0,1,39,3,60,62,3,0,12,11,0,3,30,11,0,13,88,4,15,5,28,13,1,4,48,17,17,4,28,32,46,0,16,0,
        18,11,1,8,6,38,11,2,6,11,38,2,0,45,3,11,2,7,8,4,30,14,17,2,1,1,65,18,12,16,4,2,45,123,12,56,33,1,4,3,4,7,0,0,0,3,2,0,16,4,2,4,2,0,7,4,5,2,26,
        2,25,6,11,6,1,16,2,6,17,77,15,3,35,0,1,0,5,1,0,38,16,6,3,12,3,3,3,0,9,3,1,3,5,2,9,0,18,0,25,1,3,32,1,72,46,6,2,7,1,3,14,17,0,28,1,40,13,0,20,
        15,40,6,38,24,12,43,1,1,9,0,12,6,0,6,2,4,19,3,7,1,48,0,9,5,0,5,6,9,6,10,15,2,11,19,3,9,2,0,1,10,1,27,8,1,3,6,1,14,0,26,0,27,16,3,4,9,6,2,23,
        9,10,5,25,2,1,6,1,1,48,15,9,15,14,3,4,26,60,29,13,37,21,1,6,4,0,2,11,22,23,16,16,2,2,1,3,0,5,1,6,4,0,0,4,0,0,8,3,0,2,5,0,7,1,7,3,13,2,4,10,
        3,0,2,31,0,18,3,0,12,10,4,1,0,7,5,7,0,5,4,12,2,22,10,4,2,15,2,8,9,0,23,2,197,51,3,1,1,4,13,4,3,21,4,19,3,10,5,40,0,4,1,1,10,4,1,27,34,7,21,
        2,17,2,9,6,4,2,3,0,4,2,7,8,2,5,1,15,21,3,4,4,2,2,17,22,1,5,22,4,26,7,0,32,1,11,42,15,4,1,2,5,0,19,3,1,8,6,0,10,1,9,2,13,30,8,2,24,17,19,1,4,
        4,25,13,0,10,16,11,39,18,8,5,30,82,1,6,8,18,77,11,13,20,75,11,112,78,33,3,0,0,60,17,84,9,1,1,12,30,10,49,5,32,158,178,5,5,6,3,3,1,3,1,4,7,6,
        19,31,21,0,2,9,5,6,27,4,9,8,1,76,18,12,1,4,0,3,3,6,3,12,2,8,30,16,2,25,1,5,5,4,3,0,6,10,2,3,1,0,5,1,19,3,0,8,1,5,2,6,0,0,0,19,1,2,0,5,1,2,5,
        1,3,7,0,4,12,7,3,10,22,0,9,5,1,0,2,20,1,1,3,23,30,3,9,9,1,4,191,14,3,15,6,8,50,0,1,0,0,4,0,0,1,0,2,4,2,0,2,3,0,2,0,2,2,8,7,0,1,1,1,3,3,17,11,
        91,1,9,3,2,13,4,24,15,41,3,13,3,1,20,4,125,29,30,1,0,4,12,2,21,4,5,5,19,11,0,13,11,86,2,18,0,7,1,8,8,2,2,22,1,2,6,5,2,0,1,2,8,0,2,0,5,2,1,0,
        2,10,2,0,5,9,2,1,2,0,1,0,4,0,0,10,2,5,3,0,6,1,0,1,4,4,33,3,13,17,3,18,6,4,7,1,5,78,0,4,1,13,7,1,8,1,0,35,27,15,3,0,0,0,1,11,5,41,38,15,22,6,
        14,14,2,1,11,6,20,63,5,8,27,7,11,2,2,40,58,23,50,54,56,293,8,8,1,5,1,14,0,1,12,37,89,8,8,8,2,10,6,0,0,0,4,5,2,1,0,1,1,2,7,0,3,3,0,4,6,0,3,2,
        19,3,8,0,0,0,4,4,16,0,4,1,5,1,3,0,3,4,6,2,17,10,10,31,6,4,3,6,10,126,7,3,2,2,0,9,0,0,5,20,13,0,15,0,6,0,2,5,8,64,50,3,2,12,2,9,0,0,11,8,20,
        109,2,18,23,0,0,9,61,3,0,28,41,77,27,19,17,81,5,2,14,5,83,57,252,14,154,263,14,20,8,13,6,57,39,38,
    };
    static ImWchar base_ranges[] =
    {
        0x0020, 0x00FF, // Basic Latin + Latin Supplement
        0x3000, 0x30FF, // Punctuations, Hiragana, Katakana
        0x31F0, 0x31FF, // Katakana Phonetic Extensions
        0xFF00, 0xFFEF, // Half-width characters
    };
    static bool full_ranges_unpacked = false;
    static ImWchar full_ranges[IM_ARRAYSIZE(base_ranges) + IM_ARRAYSIZE(offsets_from_0x4E00)*2 + 1];
    if (!full_ranges_unpacked)
    {
        // Unpack
        int codepoint = 0x4e00;
        memcpy(full_ranges, base_ranges, sizeof(base_ranges));
        ImWchar* dst = full_ranges + IM_ARRAYSIZE(base_ranges);;
        for (int n = 0; n < IM_ARRAYSIZE(offsets_from_0x4E00); n++, dst += 2)
            dst[0] = dst[1] = (ImWchar)(codepoint += (offsets_from_0x4E00[n] + 1));
        dst[0] = 0;
        full_ranges_unpacked = true;
    }
    return &full_ranges[0];
}

const ImWchar*  ImFontAtlas::GetGlyphRangesCyrillic()
{
    static const ImWchar ranges[] =
    {
        0x0020, 0x00FF, // Basic Latin + Latin Supplement
        0x0400, 0x052F, // Cyrillic + Cyrillic Supplement
        0x2DE0, 0x2DFF, // Cyrillic Extended-A
        0xA640, 0xA69F, // Cyrillic Extended-B
        0,
    };
    return &ranges[0];
}

const ImWchar*  ImFontAtlas::GetGlyphRangesThai()
{
    static const ImWchar ranges[] =
    {
        0x0020, 0x00FF, // Basic Latin
        0x0E00, 0x0E7F, // Thai
        0,
    };
    return &ranges[0];
}

//-----------------------------------------------------------------------------
// ImFontAtlas::GlyphRangesBuilder
//-----------------------------------------------------------------------------

void ImFontAtlas::GlyphRangesBuilder::AddText(const char* text, const char* text_end)
{
    while (text_end ? (text < text_end) : *text)
    {
        unsigned int c = 0;
        int c_len = ImTextCharFromUtf8(&c, text, text_end);
        text += c_len;
        if (c_len == 0)
            break;
        if (c < 0x10000)
            AddChar((ImWchar)c);
    }
}

void ImFontAtlas::GlyphRangesBuilder::AddRanges(const ImWchar* ranges)
{
    for (; ranges[0]; ranges += 2)
        for (ImWchar c = ranges[0]; c <= ranges[1]; c++)
            AddChar(c);
}

void ImFontAtlas::GlyphRangesBuilder::BuildRanges(ImVector<ImWchar>* out_ranges)
{
    for (int n = 0; n < 0x10000; n++)
        if (GetBit(n))
        {
            out_ranges->push_back((ImWchar)n);
            while (n < 0x10000 && GetBit(n + 1))
                n++;
            out_ranges->push_back((ImWchar)n);
        }
    out_ranges->push_back(0);
}

//-----------------------------------------------------------------------------
// ImFont
//-----------------------------------------------------------------------------

ImFont::ImFont()
{
    Scale = 1.0f;
    FallbackChar = (ImWchar)'?';
    Clear();
}

ImFont::~ImFont()
{
    // Invalidate active font so that the user gets a clear crash instead of a dangling pointer.
    // If you want to delete fonts you need to do it between Render() and NewFrame().
    // FIXME-CLEANUP
    /*
    ImGuiContext& g = *GImGui;
    if (g.Font == this)
        g.Font = NULL;
    */
    Clear();
}

void    ImFont::Clear()
{
    FontSize = 0.0f;
    DisplayOffset = ImVec2(0.0f, 1.0f);
    Glyphs.clear();
    IndexXAdvance.clear();
    IndexLookup.clear();
    FallbackGlyph = NULL;
    FallbackXAdvance = 0.0f;
    ConfigDataCount = 0;
    ConfigData = NULL;
    ContainerAtlas = NULL;
    Ascent = Descent = 0.0f;
    MetricsTotalSurface = 0;
}

void ImFont::BuildLookupTable()
{
    int max_codepoint = 0;
    for (int i = 0; i != Glyphs.Size; i++)
        max_codepoint = ImMax(max_codepoint, (int)Glyphs[i].Codepoint);

    IM_ASSERT(Glyphs.Size < 0xFFFF); // -1 is reserved
    IndexXAdvance.clear();
    IndexLookup.clear();
    GrowIndex(max_codepoint + 1);
    for (int i = 0; i < Glyphs.Size; i++)
    {
        int codepoint = (int)Glyphs[i].Codepoint;
        IndexXAdvance[codepoint] = Glyphs[i].XAdvance;
        IndexLookup[codepoint] = (unsigned short)i;
    }

    // Create a glyph to handle TAB
    // FIXME: Needs proper TAB handling but it needs to be contextualized (or we could arbitrary say that each string starts at "column 0" ?)
    if (FindGlyph((unsigned short)' '))
    {
        if (Glyphs.back().Codepoint != '\t')   // So we can call this function multiple times
            Glyphs.resize(Glyphs.Size + 1);
        ImFont::Glyph& tab_glyph = Glyphs.back();
        tab_glyph = *FindGlyph((unsigned short)' ');
        tab_glyph.Codepoint = '\t';
        tab_glyph.XAdvance *= 4;
        IndexXAdvance[(int)tab_glyph.Codepoint] = (float)tab_glyph.XAdvance;
        IndexLookup[(int)tab_glyph.Codepoint] = (unsigned short)(Glyphs.Size-1);
    }

    FallbackGlyph = NULL;
    FallbackGlyph = FindGlyph(FallbackChar);
    FallbackXAdvance = FallbackGlyph ? FallbackGlyph->XAdvance : 0.0f;
    for (int i = 0; i < max_codepoint + 1; i++)
        if (IndexXAdvance[i] < 0.0f)
            IndexXAdvance[i] = FallbackXAdvance;
}

void ImFont::SetFallbackChar(ImWchar c)
{
    FallbackChar = c;
    BuildLookupTable();
}

void ImFont::GrowIndex(int new_size)
{
    IM_ASSERT(IndexXAdvance.Size == IndexLookup.Size);
    int old_size = IndexLookup.Size;
    if (new_size <= old_size)
        return;
    IndexXAdvance.resize(new_size);
    IndexLookup.resize(new_size);
    for (int i = old_size; i < new_size; i++)
    {
        IndexXAdvance[i] = -1.0f;
        IndexLookup[i] = (unsigned short)-1;
    }
}

void ImFont::AddRemapChar(ImWchar dst, ImWchar src, bool overwrite_dst)
{
    IM_ASSERT(IndexLookup.Size > 0);    // Currently this can only be called AFTER the font has been built, aka after calling ImFontAtlas::GetTexDataAs*() function.
    int index_size = IndexLookup.Size;

    if (dst < index_size && IndexLookup.Data[dst] == (unsigned short)-1 && !overwrite_dst) // 'dst' already exists
        return;
    if (src >= index_size && dst >= index_size) // both 'dst' and 'src' don't exist -> no-op
        return;

    GrowIndex(dst + 1);
    IndexLookup[dst] = (src < index_size) ? IndexLookup.Data[src] : (unsigned short)-1;
    IndexXAdvance[dst] = (src < index_size) ? IndexXAdvance.Data[src] : 1.0f;
}

const ImFont::Glyph* ImFont::FindGlyph(unsigned short c) const
{
    if (c < IndexLookup.Size)
    {
        const unsigned short i = IndexLookup[c];
        if (i != (unsigned short)-1)
            return &Glyphs.Data[i];
    }
    return FallbackGlyph;
}

const char* ImFont::CalcWordWrapPositionA(float scale, const char* text, const char* text_end, float wrap_width) const
{
    // Simple word-wrapping for English, not full-featured. Please submit failing cases!
    // FIXME: Much possible improvements (don't cut things like "word !", "word!!!" but cut within "word,,,,", more sensible support for punctuations, support for Unicode punctuations, etc.)

    // For references, possible wrap point marked with ^
    //  "aaa bbb, ccc,ddd. eee   fff. ggg!"
    //      ^    ^    ^   ^   ^__    ^    ^

    // List of hardcoded separators: .,;!?'"

    // Skip extra blanks after a line returns (that includes not counting them in width computation)
    // e.g. "Hello    world" --> "Hello" "World"

    // Cut words that cannot possibly fit within one line.
    // e.g.: "The tropical fish" with ~5 characters worth of width --> "The tr" "opical" "fish"

    float line_width = 0.0f;
    float word_width = 0.0f;
    float blank_width = 0.0f;
    wrap_width /= scale; // We work with unscaled widths to avoid scaling every characters

    const char* word_end = text;
    const char* prev_word_end = NULL;
    bool inside_word = true;

    const char* s = text;
    while (s < text_end)
    {
        unsigned int c = (unsigned int)*s;
        const char* next_s;
        if (c < 0x80)
            next_s = s + 1;
        else
            next_s = s + ImTextCharFromUtf8(&c, s, text_end);
        if (c == 0)
            break;

        if (c < 32)
        {
            if (c == '\n')
            {
                line_width = word_width = blank_width = 0.0f;
                inside_word = true;
                s = next_s;
                continue;
            }
            if (c == '\r')
            {
                s = next_s;
                continue;
            }
        }

        const float char_width = ((int)c < IndexXAdvance.Size ? IndexXAdvance[(int)c] : FallbackXAdvance);
        if (ImCharIsSpace(c))
        {
            if (inside_word)
            {
                line_width += blank_width;
                blank_width = 0.0f;
                word_end = s;
            }
            blank_width += char_width;
            inside_word = false;
        }
        else
        {
            word_width += char_width;
            if (inside_word)
            {
                word_end = next_s;
            }
            else
            {
                prev_word_end = word_end;
                line_width += word_width + blank_width;
                word_width = blank_width = 0.0f;
            }

            // Allow wrapping after punctuation.
            inside_word = !(c == '.' || c == ',' || c == ';' || c == '!' || c == '?' || c == '\"');
        }

        // We ignore blank width at the end of the line (they can be skipped)
        if (line_width + word_width >= wrap_width)
        {
            // Words that cannot possibly fit within an entire line will be cut anywhere.
            if (word_width < wrap_width)
                s = prev_word_end ? prev_word_end : word_end;
            break;
        }

        s = next_s;
    }

    return s;
}

ImVec2 ImFont::CalcTextSizeA(float size, float max_width, float wrap_width, const char* text_begin, const char* text_end, const char** remaining) const
{
    if (!text_end)
        text_end = text_begin + strlen(text_begin); // FIXME-OPT: Need to avoid this.

    const float line_height = size;
    const float scale = size / FontSize;

    ImVec2 text_size = ImVec2(0,0);
    float line_width = 0.0f;

    const bool word_wrap_enabled = (wrap_width > 0.0f);
    const char* word_wrap_eol = NULL;

    const char* s = text_begin;
    while (s < text_end)
    {
        if (word_wrap_enabled)
        {
            // Calculate how far we can render. Requires two passes on the string data but keeps the code simple and not intrusive for what's essentially an uncommon feature.
            if (!word_wrap_eol)
            {
                word_wrap_eol = CalcWordWrapPositionA(scale, s, text_end, wrap_width - line_width);
                if (word_wrap_eol == s) // Wrap_width is too small to fit anything. Force displaying 1 character to minimize the height discontinuity.
                    word_wrap_eol++;    // +1 may not be a character start point in UTF-8 but it's ok because we use s >= word_wrap_eol below
            }

            if (s >= word_wrap_eol)
            {
                if (text_size.x < line_width)
                    text_size.x = line_width;
                text_size.y += line_height;
                line_width = 0.0f;
                word_wrap_eol = NULL;

                // Wrapping skips upcoming blanks
                while (s < text_end)
                {
                    const char c = *s;
                    if (ImCharIsSpace(c)) { s++; } else if (c == '\n') { s++; break; } else { break; }
                }
                continue;
            }
        }

        // Decode and advance source
        const char* prev_s = s;
        unsigned int c = (unsigned int)*s;
        if (c < 0x80)
        {
            s += 1;
        }
        else
        {
            s += ImTextCharFromUtf8(&c, s, text_end);
            if (c == 0) // Malformed UTF-8?
                break;
        }

        if (c < 32)
        {
            if (c == '\n')
            {
                text_size.x = ImMax(text_size.x, line_width);
                text_size.y += line_height;
                line_width = 0.0f;
                continue;
            }
            if (c == '\r')
                continue;
        }

        const float char_width = ((int)c < IndexXAdvance.Size ? IndexXAdvance[(int)c] : FallbackXAdvance) * scale;
        if (line_width + char_width >= max_width)
        {
            s = prev_s;
            break;
        }

        line_width += char_width;
    }

    if (text_size.x < line_width)
        text_size.x = line_width;

    if (line_width > 0 || text_size.y == 0.0f)
        text_size.y += line_height;

    if (remaining)
        *remaining = s;

    return text_size;
}

void ImFont::RenderChar(ImDrawList* draw_list, float size, ImVec2 pos, ImU32 col, unsigned short c) const
{
    if (c == ' ' || c == '\t' || c == '\n' || c == '\r') // Match behavior of RenderText(), those 4 codepoints are hard-coded.
        return;
    if (const Glyph* glyph = FindGlyph(c))
    {
        float scale = (size >= 0.0f) ? (size / FontSize) : 1.0f;
        pos.x = (float)(int)pos.x + DisplayOffset.x;
        pos.y = (float)(int)pos.y + DisplayOffset.y;
        draw_list->PrimReserve(6, 4);
        draw_list->PrimRectUV(ImVec2(pos.x + glyph->X0 * scale, pos.y + glyph->Y0 * scale), ImVec2(pos.x + glyph->X1 * scale, pos.y + glyph->Y1 * scale), ImVec2(glyph->U0, glyph->V0), ImVec2(glyph->U1, glyph->V1), col);
    }
}

void ImFont::RenderText(ImDrawList* draw_list, float size, ImVec2 pos, ImU32 col, const ImVec4& clip_rect, const char* text_begin, const char* text_end, float wrap_width, bool cpu_fine_clip) const
{
    if (!text_end)
        text_end = text_begin + strlen(text_begin); // ImGui functions generally already provides a valid text_end, so this is merely to handle direct calls.

    // Align to be pixel perfect
    pos.x = (float)(int)pos.x + DisplayOffset.x;
    pos.y = (float)(int)pos.y + DisplayOffset.y;
    float x = pos.x;
    float y = pos.y;
    if (y > clip_rect.w)
        return;

    const float scale = size / FontSize;
    const float line_height = FontSize * scale;
    const bool word_wrap_enabled = (wrap_width > 0.0f);
    const char* word_wrap_eol = NULL;

    // Skip non-visible lines
    const char* s = text_begin;
    if (!word_wrap_enabled && y + line_height < clip_rect.y)
        while (s < text_end && *s != '\n')  // Fast-forward to next line
            s++;

    // Reserve vertices for remaining worse case (over-reserving is useful and easily amortized)
    const int vtx_count_max = (int)(text_end - s) * 4;
    const int idx_count_max = (int)(text_end - s) * 6;
    const int idx_expected_size = draw_list->IdxBuffer.Size + idx_count_max;
    draw_list->PrimReserve(idx_count_max, vtx_count_max);

    ImDrawVert* vtx_write = draw_list->_VtxWritePtr;
    ImDrawIdx* idx_write = draw_list->_IdxWritePtr;
    unsigned int vtx_current_idx = draw_list->_VtxCurrentIdx;

    while (s < text_end)
    {
        if (word_wrap_enabled)
        {
            // Calculate how far we can render. Requires two passes on the string data but keeps the code simple and not intrusive for what's essentially an uncommon feature.
            if (!word_wrap_eol)
            {
                word_wrap_eol = CalcWordWrapPositionA(scale, s, text_end, wrap_width - (x - pos.x));
                if (word_wrap_eol == s) // Wrap_width is too small to fit anything. Force displaying 1 character to minimize the height discontinuity.
                    word_wrap_eol++;    // +1 may not be a character start point in UTF-8 but it's ok because we use s >= word_wrap_eol below
            }

            if (s >= word_wrap_eol)
            {
                x = pos.x;
                y += line_height;
                word_wrap_eol = NULL;

                // Wrapping skips upcoming blanks
                while (s < text_end)
                {
                    const char c = *s;
                    if (ImCharIsSpace(c)) { s++; } else if (c == '\n') { s++; break; } else { break; }
                }
                continue;
            }
        }

        // Decode and advance source
        unsigned int c = (unsigned int)*s;
        if (c < 0x80)
        {
            s += 1;
        }
        else
        {
            s += ImTextCharFromUtf8(&c, s, text_end);
            if (c == 0) // Malformed UTF-8?
                break;
        }

        if (c < 32)
        {
            if (c == '\n')
            {
                x = pos.x;
                y += line_height;

                if (y > clip_rect.w)
                    break;
                if (!word_wrap_enabled && y + line_height < clip_rect.y)
                    while (s < text_end && *s != '\n')  // Fast-forward to next line
                        s++;
                continue;
            }
            if (c == '\r')
                continue;
        }

        float char_width = 0.0f;
        if (const Glyph* glyph = FindGlyph((unsigned short)c))
        {
            char_width = glyph->XAdvance * scale;

            // Arbitrarily assume that both space and tabs are empty glyphs as an optimization
            if (c != ' ' && c != '\t')
            {
                // We don't do a second finer clipping test on the Y axis as we've already skipped anything before clip_rect.y and exit once we pass clip_rect.w
                float x1 = x + glyph->X0 * scale;
                float x2 = x + glyph->X1 * scale;
                float y1 = y + glyph->Y0 * scale;
                float y2 = y + glyph->Y1 * scale;
                if (x1 <= clip_rect.z && x2 >= clip_rect.x)
                {
                    // Render a character
                    float u1 = glyph->U0;
                    float v1 = glyph->V0;
                    float u2 = glyph->U1;
                    float v2 = glyph->V1;

                    // CPU side clipping used to fit text in their frame when the frame is too small. Only does clipping for axis aligned quads.
                    if (cpu_fine_clip)
                    {
                        if (x1 < clip_rect.x)
                        {
                            u1 = u1 + (1.0f - (x2 - clip_rect.x) / (x2 - x1)) * (u2 - u1);
                            x1 = clip_rect.x;
                        }
                        if (y1 < clip_rect.y)
                        {
                            v1 = v1 + (1.0f - (y2 - clip_rect.y) / (y2 - y1)) * (v2 - v1);
                            y1 = clip_rect.y;
                        }
                        if (x2 > clip_rect.z)
                        {
                            u2 = u1 + ((clip_rect.z - x1) / (x2 - x1)) * (u2 - u1);
                            x2 = clip_rect.z;
                        }
                        if (y2 > clip_rect.w)
                        {
                            v2 = v1 + ((clip_rect.w - y1) / (y2 - y1)) * (v2 - v1);
                            y2 = clip_rect.w;
                        }
                        if (y1 >= y2)
                        {
                            x += char_width;
                            continue;
                        }
                    }

                    // We are NOT calling PrimRectUV() here because non-inlined causes too much overhead in a debug builds. Inlined here:
                    {
                        idx_write[0] = (ImDrawIdx)(vtx_current_idx); idx_write[1] = (ImDrawIdx)(vtx_current_idx+1); idx_write[2] = (ImDrawIdx)(vtx_current_idx+2);
                        idx_write[3] = (ImDrawIdx)(vtx_current_idx); idx_write[4] = (ImDrawIdx)(vtx_current_idx+2); idx_write[5] = (ImDrawIdx)(vtx_current_idx+3);
                        vtx_write[0].pos.x = x1; vtx_write[0].pos.y = y1; vtx_write[0].col = col; vtx_write[0].uv.x = u1; vtx_write[0].uv.y = v1;
                        vtx_write[1].pos.x = x2; vtx_write[1].pos.y = y1; vtx_write[1].col = col; vtx_write[1].uv.x = u2; vtx_write[1].uv.y = v1;
                        vtx_write[2].pos.x = x2; vtx_write[2].pos.y = y2; vtx_write[2].col = col; vtx_write[2].uv.x = u2; vtx_write[2].uv.y = v2;
                        vtx_write[3].pos.x = x1; vtx_write[3].pos.y = y2; vtx_write[3].col = col; vtx_write[3].uv.x = u1; vtx_write[3].uv.y = v2;
                        vtx_write += 4;
                        vtx_current_idx += 4;
                        idx_write += 6;
                    }
                }
            }
        }

        x += char_width;
    }

    // Give back unused vertices
    draw_list->VtxBuffer.resize((int)(vtx_write - draw_list->VtxBuffer.Data));
    draw_list->IdxBuffer.resize((int)(idx_write - draw_list->IdxBuffer.Data));
    draw_list->CmdBuffer[draw_list->CmdBuffer.Size-1].ElemCount -= (idx_expected_size - draw_list->IdxBuffer.Size);
    draw_list->_VtxWritePtr = vtx_write;
    draw_list->_IdxWritePtr = idx_write;
    draw_list->_VtxCurrentIdx = (unsigned int)draw_list->VtxBuffer.Size;
}

//-----------------------------------------------------------------------------
// Internals Drawing Helpers
//-----------------------------------------------------------------------------

static inline float ImAcos01(float x)
{
    if (x <= 0.0f) return IM_PI * 0.5f;
    if (x >= 1.0f) return 0.0f;
    return acosf(x);
    //return (-0.69813170079773212f * x * x - 0.87266462599716477f) * x + 1.5707963267948966f; // Cheap approximation, may be enough for what we do.
}

// FIXME: Cleanup and move code to ImDrawList.
void ImGui::RenderRectFilledRangeH(ImDrawList* draw_list, const ImRect& rect, ImU32 col, float x_start_norm, float x_end_norm, float rounding)
{
    if (x_end_norm == x_start_norm)
        return;
    if (x_start_norm > x_end_norm)
        ImSwap(x_start_norm, x_end_norm);

    ImVec2 p0 = ImVec2(ImLerp(rect.Min.x, rect.Max.x, x_start_norm), rect.Min.y);
    ImVec2 p1 = ImVec2(ImLerp(rect.Min.x, rect.Max.x, x_end_norm), rect.Max.y);
    if (rounding == 0.0f)
    {
        draw_list->AddRectFilled(p0, p1, col, 0.0f);
        return;
    }

    rounding = ImClamp(ImMin((rect.Max.x - rect.Min.x) * 0.5f, (rect.Max.y - rect.Min.y) * 0.5f) - 1.0f, 0.0f, rounding);
    const float inv_rounding = 1.0f / rounding;
    const float arc0_b = ImAcos01(1.0f - (p0.x - rect.Min.x) * inv_rounding);
    const float arc0_e = ImAcos01(1.0f - (p1.x - rect.Min.x) * inv_rounding);
    const float x0 = ImMax(p0.x, rect.Min.x + rounding);
    if (arc0_b == arc0_e)
    {
        draw_list->PathLineTo(ImVec2(x0, p1.y));
        draw_list->PathLineTo(ImVec2(x0, p0.y));
    }
    else if (arc0_b == 0.0f && arc0_e == IM_PI*0.5f)
    {
        draw_list->PathArcToFast(ImVec2(x0, p1.y - rounding), rounding, 3, 6); // BL
        draw_list->PathArcToFast(ImVec2(x0, p0.y + rounding), rounding, 6, 9); // TR
    }
    else
    {
        draw_list->PathArcTo(ImVec2(x0, p1.y - rounding), rounding, IM_PI - arc0_e, IM_PI - arc0_b, 3); // BL
        draw_list->PathArcTo(ImVec2(x0, p0.y + rounding), rounding, IM_PI + arc0_b, IM_PI + arc0_e, 3); // TR
    }
    if (p1.x > rect.Min.x + rounding)
    {
        const float arc1_b = ImAcos01(1.0f - (rect.Max.x - p1.x) * inv_rounding);
        const float arc1_e = ImAcos01(1.0f - (rect.Max.x - p0.x) * inv_rounding);
        const float x1 = ImMin(p1.x, rect.Max.x - rounding);
        if (arc1_b == arc1_e)
        {
            draw_list->PathLineTo(ImVec2(x1, p0.y));
            draw_list->PathLineTo(ImVec2(x1, p1.y));
        }
        else if (arc1_b == 0.0f && arc1_e == IM_PI*0.5f)
        {
            draw_list->PathArcToFast(ImVec2(x1, p0.y + rounding), rounding, 9, 12); // TR
            draw_list->PathArcToFast(ImVec2(x1, p1.y - rounding), rounding, 0, 3);  // BR
        }
        else
        {
            draw_list->PathArcTo(ImVec2(x1, p0.y + rounding), rounding, -arc1_e, -arc1_b, 3); // TR
            draw_list->PathArcTo(ImVec2(x1, p1.y - rounding), rounding, +arc1_b, +arc1_e, 3); // BR
        }
    }
    draw_list->PathFillConvex(col);
}

//-----------------------------------------------------------------------------
// DEFAULT FONT DATA
//-----------------------------------------------------------------------------
// Compressed with stb_compress() then converted to a C array.
// Use the program in extra_fonts/binary_to_compressed_c.cpp to create the array from a TTF file.
// Decompression from stb.h (public domain) by Sean Barrett https://github.com/nothings/stb/blob/master/stb.h
//-----------------------------------------------------------------------------

static unsigned int stb_decompress_length(unsigned char *input)
{
    return (input[8] << 24) + (input[9] << 16) + (input[10] << 8) + input[11];
}

static unsigned char *stb__barrier, *stb__barrier2, *stb__barrier3, *stb__barrier4;
static unsigned char *stb__dout;
static void stb__match(unsigned char *data, unsigned int length)
{
    // INVERSE of memmove... write each byte before copying the next...
    IM_ASSERT (stb__dout + length <= stb__barrier);
    if (stb__dout + length > stb__barrier) { stb__dout += length; return; }
    if (data < stb__barrier4) { stb__dout = stb__barrier+1; return; }
    while (length--) *stb__dout++ = *data++;
}

static void stb__lit(unsigned char *data, unsigned int length)
{
    IM_ASSERT (stb__dout + length <= stb__barrier);
    if (stb__dout + length > stb__barrier) { stb__dout += length; return; }
    if (data < stb__barrier2) { stb__dout = stb__barrier+1; return; }
    memcpy(stb__dout, data, length);
    stb__dout += length;
}

#define stb__in2(x)   ((i[x] << 8) + i[(x)+1])
#define stb__in3(x)   ((i[x] << 16) + stb__in2((x)+1))
#define stb__in4(x)   ((i[x] << 24) + stb__in3((x)+1))

static unsigned char *stb_decompress_token(unsigned char *i)
{
    if (*i >= 0x20) { // use fewer if's for cases that expand small
        if (*i >= 0x80)       stb__match(stb__dout-i[1]-1, i[0] - 0x80 + 1), i += 2;
        else if (*i >= 0x40)  stb__match(stb__dout-(stb__in2(0) - 0x4000 + 1), i[2]+1), i += 3;
        else /* *i >= 0x20 */ stb__lit(i+1, i[0] - 0x20 + 1), i += 1 + (i[0] - 0x20 + 1);
    } else { // more ifs for cases that expand large, since overhead is amortized
        if (*i >= 0x18)       stb__match(stb__dout-(stb__in3(0) - 0x180000 + 1), i[3]+1), i += 4;
        else if (*i >= 0x10)  stb__match(stb__dout-(stb__in3(0) - 0x100000 + 1), stb__in2(3)+1), i += 5;
        else if (*i >= 0x08)  stb__lit(i+2, stb__in2(0) - 0x0800 + 1), i += 2 + (stb__in2(0) - 0x0800 + 1);
        else if (*i == 0x07)  stb__lit(i+3, stb__in2(1) + 1), i += 3 + (stb__in2(1) + 1);
        else if (*i == 0x06)  stb__match(stb__dout-(stb__in3(1)+1), i[4]+1), i += 5;
        else if (*i == 0x04)  stb__match(stb__dout-(stb__in3(1)+1), stb__in2(4)+1), i += 6;
    }
    return i;
}

static unsigned int stb_adler32(unsigned int adler32, unsigned char *buffer, unsigned int buflen)
{
    const unsigned long ADLER_MOD = 65521;
    unsigned long s1 = adler32 & 0xffff, s2 = adler32 >> 16;
    unsigned long blocklen, i;

    blocklen = buflen % 5552;
    while (buflen) {
        for (i=0; i + 7 < blocklen; i += 8) {
            s1 += buffer[0], s2 += s1;
            s1 += buffer[1], s2 += s1;
            s1 += buffer[2], s2 += s1;
            s1 += buffer[3], s2 += s1;
            s1 += buffer[4], s2 += s1;
            s1 += buffer[5], s2 += s1;
            s1 += buffer[6], s2 += s1;
            s1 += buffer[7], s2 += s1;

            buffer += 8;
        }

        for (; i < blocklen; ++i)
            s1 += *buffer++, s2 += s1;

        s1 %= ADLER_MOD, s2 %= ADLER_MOD;
        buflen -= blocklen;
        blocklen = 5552;
    }
    return (unsigned int)(s2 << 16) + (unsigned int)s1;
}

static unsigned int stb_decompress(unsigned char *output, unsigned char *i, unsigned int length)
{
    unsigned int olen;
    if (stb__in4(0) != 0x57bC0000) return 0;
    if (stb__in4(4) != 0)          return 0; // error! stream is > 4GB
    olen = stb_decompress_length(i);
    stb__barrier2 = i;
    stb__barrier3 = i+length;
    stb__barrier = output + olen;
    stb__barrier4 = output;
    i += 16;

    stb__dout = output;
    for (;;) {
        unsigned char *old_i = i;
        i = stb_decompress_token(i);
        if (i == old_i) {
            if (*i == 0x05 && i[1] == 0xfa) {
                IM_ASSERT(stb__dout == output + olen);
                if (stb__dout != output + olen) return 0;
                if (stb_adler32(1, output, olen) != (unsigned int) stb__in4(2))
                    return 0;
                return olen;
            } else {
                IM_ASSERT(0); /* NOTREACHED */
                return 0;
            }
        }
        IM_ASSERT(stb__dout <= output + olen);
        if (stb__dout > output + olen)
            return 0;
    }
}

//-----------------------------------------------------------------------------
// ProggyClean.ttf
// Copyright (c) 2004, 2005 Tristan Grimmer
// MIT license (see License.txt in http://www.upperbounds.net/download/ProggyClean.ttf.zip)
// Download and more information at http://upperbounds.net
//-----------------------------------------------------------------------------
// File: 'ProggyClean.ttf' (41208 bytes)
// Exported using binary_to_compressed_c.cpp
//-----------------------------------------------------------------------------
static const char proggy_clean_ttf_compressed_data_base85[11980+1] =
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    "[%$Z$uF6pA6Ki2O5:8w*vP1<-1`[G,)-m#>0`P&#eb#.3i)rtB61(o'$?X3B</R90;eZ]%Ncq;-Tl]#F>2Qft^ae_5tKL9MUe9b*sLEQ95C&`=G?@Mj=wh*'3E>=-<)Gt*Iw)'QG:`@I"
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    "GT4CPGT4CPGT4CPGT4CPGT4CPGT4CP-qekC`.9kEg^+F$kwViFJTB&5KTB&5KTB&5KTB&5KTB&5KTB&5KTB&5KTB&5KTB&5KTB&5KTB&5KTB&5KTB&5KTB&5KTB&5o,^<-28ZI'O?;xp"
    "O?;xpO?;xpO?;xpO?;xpO?;xpO?;xpO?;xpO?;xpO?;xpO?;xpO?;xpO?;xpO?;xp;7q-#lLYI:xvD=#";

static const char* GetDefaultCompressedFontDataTTFBase85()
{
    return proggy_clean_ttf_compressed_data_base85;
}