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free movement may not be necessary for now, but doing it is trivial, so why not. Still this code is horribly inefficient :-/.

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svn-id: r7229
This commit is contained in:
Max Horn 2003-04-30 18:34:29 +00:00
parent f0dceacf4b
commit 7093694781
1 changed files with 36 additions and 31 deletions
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67
backends/sdl/sdl-common.cpp
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@ -194,38 +194,43 @@ void OSystem_SDL_Common::copy_rect(const byte *buf, int pitch, int x, int y, int
void OSystem_SDL_Common::move_screen(int dx, int dy, int height) {
if ((dx == 0) && (dy == 0))
return;
if (dx == 0) {
// vertical movement
if (dy > 0) {
// move down
// copy from bottom to top
for (int y = height - 1; y >= dy; y--)
copy_rect((byte *)_screen->pixels + _screenWidth * (y - dy), _screenWidth, 0, y, _screenWidth, 1);
} else {
// move up
// copy from top to bottom
for (int y = 0; y < height + dx; y++)
copy_rect((byte *)_screen->pixels + _screenWidth * (y - dy), _screenWidth, 0, y, _screenWidth, 1);
}
} else if (dy == 0) {
// horizontal movement
if (dx > 0) {
// move right
// copy from right to left
for (int x = _screenWidth - 1; x >= dx; x--)
copy_rect((byte *)_screen->pixels + x - dx, _screenWidth, x, 0, 1, height);
} else {
// move left
// copy from left to right
for (int x = 0; x < _screenWidth; x++)
copy_rect((byte *)_screen->pixels + x - dx, _screenWidth, x, 0, 1, height);
}
} else {
// free movement
// not neccessary for now
// Short circuit check - do we have to do anything anyway?
if ((dx == 0 && dy == 0) || height <= 0)
return;
int x, y;
// We'll have to do a full screen redraw anyway, so set the flag.
_forceFull = true;
// Hide the mouse
if (_mouseDrawn)
undraw_mouse();
// FIXME - calling copy rect repeatedly is horribly inefficient, as it (un)locks the surface repeatedly
// and it performs unneeded clipping checks etc.
// vertical movement
if (dy > 0) {
// move down - copy from bottom to top
for (y = height - 1; y >= dy; y--)
copy_rect((byte *)_screen->pixels + _screenWidth * (y - dy), _screenWidth, 0, y, _screenWidth, 1);
} else if (dy < 0) {
// move up - copy from top to bottom
for (y = 0; y < height + dx; y++)
copy_rect((byte *)_screen->pixels + _screenWidth * (y - dy), _screenWidth, 0, y, _screenWidth, 1);
}
// horizontal movement
if (dx > 0) {
// move right - copy from right to left
for (x = _screenWidth - 1; x >= dx; x--)
copy_rect((byte *)_screen->pixels + x - dx, _screenWidth, x, 0, 1, height);
} else if (dx < 0) {
// move left - copy from left to right
for (x = 0; x < _screenWidth; x++)
copy_rect((byte *)_screen->pixels + x - dx, _screenWidth, x, 0, 1, height);
}
}