Commit 9325b22ef03302d80b6ab9a4eade362f22f9657e
2020-05-29T21:26:32
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?"
diff --git a/src/video/windows/SDL_windowsframebuffer.c b/src/video/windows/SDL_windowsframebuffer.c
index 509233e..e45e796 100644
--- a/src/video/windows/SDL_windowsframebuffer.c
+++ b/src/video/windows/SDL_windowsframebuffer.c
@@ -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;
}