Fixed bug 5113 - SDL_UpdateWindowSurfaceRects BitBlt the entire surfa…

…ce 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?"
libsdl-org · May 30, 2020 · 9325b22 · 9325b22
1 parent d000c1c
commit 9325b22
Showing 1 changed file with 5 additions and 1 deletion.
diff --git 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;
 }