+static void PrepareEnvelopeRequestToScreen(Bitmap *bitmap, int sx, int sy,
+ int xsize, int ysize)
+{
+ if (!global.use_envelope_request ||
+ request.sort_priority <= 0)
+ return;
+
+ if (request.bitmap == NULL ||
+ xsize > request.xsize ||
+ ysize > request.ysize)
+ {
+ if (request.bitmap != NULL)
+ FreeBitmap(request.bitmap);
+
+ request.bitmap = CreateBitmap(xsize, ysize, DEFAULT_DEPTH);
+
+ SDL_Surface *surface = request.bitmap->surface;
+
+ if ((request.bitmap->surface_masked = SDLGetNativeSurface(surface)) == NULL)
+ Fail("SDLGetNativeSurface() failed");
+ }
+
+ BlitBitmap(bitmap, request.bitmap, sx, sy, xsize, ysize, 0, 0);
+
+ SDLFreeBitmapTextures(request.bitmap);
+ SDLCreateBitmapTextures(request.bitmap);
+
+ // set envelope request run-time values
+ request.sx = sx;
+ request.sy = sy;
+ request.xsize = xsize;
+ request.ysize = ysize;
+}
+