For a test program, I’d like to create a window with a bitmap in it.
When the mouse cursor is moving around in the window, the bitmap moves
with the cursor.
However, the bitmap movement always seems to have a lag of anywhere from
half a second to two seconds.
Whenever there’s a SDL_MOUSEMOVEMENT event, I call a function that
contains this code:
src.x = 0; src.y = 0; src.w = penguin->w; src.h = penguin->h; dest.x = cursor_x_pos - penguin->w / 2; dest.y = cursor_y_pos - penguin->h / 2; dest.w = penguin->w; dest.h = penguin->h; Uint32 black = SDL_MapRGB(screen->format, 255, 255, 255); SDL_FillRect(screen, NULL, black); SDL_BlitSurface(penguin, &src, screen, &dest); SDL_Flip(screen);
Where src and dest are SDL_Rects.
Any clue why it’s so slow on moving the bitmap (actually, it’s a .gif
file, I’m using IMG_Load to get it) around?
Phantom Works - Integrated Technology Development Labs
The Boeing Company