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Fixed bug 5113 - SDL_UpdateWindowSurfaceRects BitBlt the entire surface on Win32 

Ryan C. Gordon

As discussed here:
https://discourse.libsdl.org/t/question-about-implementation-of-sdl-updatewindowsurfacerects/27561

"As you can see this function [WIN_UpdateWindowFramebuffer, in src/video/windows/SDL_windowsframebuffer.c] calls BitBlt on entire screen, even though it accepts the rects. Rects variable is not even used in this function at all. Now my question is why is that the case?"
This commit is contained in:
Sam Lantinga 2020-05-29 21:26:32 -07:00
parent d000c1cd6d
commit 9325b22ef0
1 changed files with 5 additions and 1 deletions
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6
src/video/windows/SDL_windowsframebuffer.c
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@ -99,8 +99,12 @@ int WIN_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format, voi
int WIN_UpdateWindowFramebuffer(_THIS, SDL_Window * window, const SDL_Rect * rects, int numrects)
{
SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
int i;
BitBlt(data->hdc, 0, 0, window->w, window->h, data->mdc, 0, 0, SRCCOPY);
for (i = 0; i < numrects; ++i) {
BitBlt(data->hdc, rects[i].x, rects[i].y, rects[i].w, rects[i].h,
data->mdc, rects[i].x, rects[i].y, SRCCOPY);
}
return 0;
}