ImDrawList: Internals: Add ability to scale anti-alias fringe. This enable users to keep geometry sharp while scaling vertex buffer content.
diff --git a/imgui.h b/imgui.h
index c4459a0..6fc7732 100644
--- a/imgui.h
+++ b/imgui.h
@@ -2333,6 +2333,7 @@
ImVector<ImVec2> _Path; // [Internal] current path building
ImDrawCmdHeader _CmdHeader; // [Internal] template of active commands. Fields should match those of CmdBuffer.back().
ImDrawListSplitter _Splitter; // [Internal] for channels api (note: prefer using your own persistent instance of ImDrawListSplitter!)
+ float _FringeScale; // [Internal] anti-alias fringe is scaled by this value, this helps to keep things sharp while zooming at vertex buffer content
// If you want to create ImDrawList instances, pass them ImGui::GetDrawListSharedData() or create and use your own ImDrawListSharedData (so you can use ImDrawList without ImGui)
ImDrawList(const ImDrawListSharedData* shared_data) { memset(this, 0, sizeof(*this)); _Data = shared_data; }
diff --git a/imgui_draw.cpp b/imgui_draw.cpp
index 947825a..1e6a27f 100644
--- a/imgui_draw.cpp
+++ b/imgui_draw.cpp
@@ -405,6 +405,7 @@
_Path.resize(0);
_Splitter.Clear();
CmdBuffer.push_back(ImDrawCmd());
+ _FringeScale = 1.0f;
}
void ImDrawList::_ClearFreeMemory()
@@ -680,12 +681,12 @@
const ImVec2 opaque_uv = _Data->TexUvWhitePixel;
const int count = closed ? points_count : points_count - 1; // The number of line segments we need to draw
- const bool thick_line = (thickness > 1.0f);
+ const bool thick_line = (thickness > _FringeScale);
if (Flags & ImDrawListFlags_AntiAliasedLines)
{
// Anti-aliased stroke
- const float AA_SIZE = 1.0f;
+ const float AA_SIZE = _FringeScale;
const ImU32 col_trans = col & ~IM_COL32_A_MASK;
// Thicknesses <1.0 should behave like thickness 1.0
@@ -696,7 +697,7 @@
// Do we want to draw this line using a texture?
// - For now, only draw integer-width lines using textures to avoid issues with the way scaling occurs, could be improved.
// - If AA_SIZE is not 1.0f we cannot use the texture path.
- const bool use_texture = (Flags & ImDrawListFlags_AntiAliasedLinesUseTex) && (integer_thickness < IM_DRAWLIST_TEX_LINES_WIDTH_MAX) && (fractional_thickness <= 0.00001f);
+ const bool use_texture = (Flags & ImDrawListFlags_AntiAliasedLinesUseTex) && (integer_thickness < IM_DRAWLIST_TEX_LINES_WIDTH_MAX) && (fractional_thickness <= 0.00001f) && (AA_SIZE == 1.0f);
// We should never hit this, because NewFrame() doesn't set ImDrawListFlags_AntiAliasedLinesUseTex unless ImFontAtlasFlags_NoBakedLines is off
IM_ASSERT_PARANOID(!use_texture || !(_Data->Font->ContainerAtlas->Flags & ImFontAtlasFlags_NoBakedLines));
@@ -938,7 +939,7 @@
if (Flags & ImDrawListFlags_AntiAliasedFill)
{
// Anti-aliased Fill
- const float AA_SIZE = 1.0f;
+ const float AA_SIZE = _FringeScale;
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);
