src/video/windows/SDL_windowsmouse.c

/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/

#include "SDL_config.h"

#include "SDL_assert.h"
#include "SDL_windowsvideo.h"

#include "../../events/SDL_mouse_c.h"


HCURSOR SDL_cursor = NULL;


static SDL_Cursor *
WIN_CreateDefaultCursor()
{
    SDL_Cursor *cursor;

    cursor = SDL_calloc(1, sizeof(*cursor));
    if (cursor) {
        cursor->driverdata = LoadCursor(NULL, IDC_ARROW);
    } else {
        SDL_OutOfMemory();
    }

    return cursor;
}

static SDL_Cursor *
WIN_CreateCursor(SDL_Surface * surface, int hot_x, int hot_y)
{
    SDL_Cursor *cursor;
    HICON hicon;
    HDC hdc;
    BITMAPV4HEADER bmh;
    LPVOID pixels;
    ICONINFO ii;

    SDL_zero(bmh);
    bmh.bV4Size = sizeof(bmh);
    bmh.bV4Width = surface->w;
    bmh.bV4Height = -surface->h; /* Invert the image */
    bmh.bV4Planes = 1;
    bmh.bV4BitCount = 32;
    bmh.bV4V4Compression = BI_BITFIELDS;
    bmh.bV4AlphaMask = 0xFF000000;
    bmh.bV4RedMask   = 0x00FF0000;
    bmh.bV4GreenMask = 0x0000FF00;
    bmh.bV4BlueMask  = 0x000000FF;

    hdc = GetDC(NULL);
    SDL_zero(ii);
    ii.fIcon = FALSE;
    ii.xHotspot = (DWORD)hot_x;
    ii.yHotspot = (DWORD)hot_y;
    ii.hbmColor = CreateDIBSection(hdc, (BITMAPINFO*)&bmh, DIB_RGB_COLORS, &pixels, NULL, 0);
    ii.hbmMask = CreateBitmap(surface->w, surface->h, 1, 1, NULL);
    ReleaseDC(NULL, hdc);

    SDL_assert(surface->format->format == SDL_PIXELFORMAT_ARGB8888);
    SDL_assert(surface->pitch == surface->w * 4);
    SDL_memcpy(pixels, surface->pixels, surface->h * surface->pitch);

    hicon = CreateIconIndirect(&ii);

    DeleteObject(ii.hbmColor);
    DeleteObject(ii.hbmMask);

    if (!hicon) {
        WIN_SetError("CreateIconIndirect()");
        return NULL;
    }

    cursor = SDL_calloc(1, sizeof(*cursor));
    if (cursor) {
        cursor->driverdata = hicon;
    } else {
        DestroyIcon(hicon);
        SDL_OutOfMemory();
    }

    return cursor;
}

static void
WIN_FreeCursor(SDL_Cursor * cursor)
{
    HICON hicon = (HICON)cursor->driverdata;

    DestroyIcon(hicon);
    SDL_free(cursor);
}

static int
WIN_ShowCursor(SDL_Cursor * cursor)
{
    if (cursor) {
        SDL_cursor = (HCURSOR)cursor->driverdata;
    } else {
        SDL_cursor = NULL;
    }
    if (SDL_GetMouseFocus() != NULL) {
        SetCursor(SDL_cursor);
    }
    return 0;
}

static void
WIN_WarpMouse(SDL_Window * window, int x, int y)
{
    HWND hwnd = ((SDL_WindowData *) window->driverdata)->hwnd;
    POINT pt;

    pt.x = x;
    pt.y = y;
    ClientToScreen(hwnd, &pt);
    SetCursorPos(pt.x, pt.y);
}

static int
WIN_SetRelativeMouseMode(SDL_bool enabled)
{
    SDL_Unsupported();
    return -1;
}

void
WIN_InitMouse(_THIS)
{
    SDL_Mouse *mouse = SDL_GetMouse();

    mouse->CreateCursor = WIN_CreateCursor;
    mouse->ShowCursor = WIN_ShowCursor;
    mouse->FreeCursor = WIN_FreeCursor;
    mouse->WarpMouse = WIN_WarpMouse;
    mouse->SetRelativeMouseMode = WIN_SetRelativeMouseMode;

    SDL_SetDefaultCursor(WIN_CreateDefaultCursor());
}

void
WIN_QuitMouse(_THIS)
{
}

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