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fix: Blending rendering anomaly when using the software renderer with SDL_WINDOW_TRANSPARENT on Windows. (#13866)

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Qiang
2025-09-04 22:41:45 +08:00
committed by GitHub
parent ea1a769322
commit f2d2cd8152
4 changed files with 388 additions and 4 deletions
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17
src/video/windows/SDL_windowsframebuffer.c
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@@ -59,6 +59,9 @@ bool WIN_CreateWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window, SDL
GetDIBits(data->hdc, hbm, 0, 0, NULL, info, DIB_RGB_COLORS);
DeleteObject(hbm);
// Check if a transparent channel is required
bool need_alpha = (window->flags & SDL_WINDOW_TRANSPARENT) != 0;
*format = SDL_PIXELFORMAT_UNKNOWN;
if (info->bmiHeader.biCompression == BI_BITFIELDS) {
int bpp;
@@ -68,16 +71,22 @@ bool WIN_CreateWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window, SDL
masks = (Uint32 *)((Uint8 *)info + info->bmiHeader.biSize);
*format = SDL_GetPixelFormatForMasks(bpp, masks[0], masks[1], masks[2], 0);
}
if (*format == SDL_PIXELFORMAT_UNKNOWN) {
// We'll use RGB format for now
*format = SDL_PIXELFORMAT_XRGB8888;
if (*format == SDL_PIXELFORMAT_UNKNOWN || need_alpha) {
// We'll use RGB or BGRA32 format for now
*format = need_alpha ? SDL_PIXELFORMAT_BGRA32 : SDL_PIXELFORMAT_XRGB8888;
// Create a new one
SDL_memset(info, 0, size);
info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
info->bmiHeader.biPlanes = 1;
info->bmiHeader.biBitCount = 32;
info->bmiHeader.biCompression = BI_RGB;
info->bmiHeader.biCompression = need_alpha ? BI_BITFIELDS : BI_RGB;
if (need_alpha) {
int tmpbpp;
Uint32 *bgr32masks = (Uint32 *)((Uint8 *)info + info->bmiHeader.biSize);
SDL_GetMasksForPixelFormat(SDL_PIXELFORMAT_BGRA32, &tmpbpp, &bgr32masks[0], &bgr32masks[1], &bgr32masks[2], &bgr32masks[3]);
}
}
// Fill in the size information