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(svn r10206) -Codechange: more moving things to blitter-layer: ScrollBuffer

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truelight
2007-06-18 20:08:21 +00:00
parent 49220cc6f1
commit 26e9b5ca5f
7 changed files with 120 additions and 47 deletions
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48
src/gfx.cpp
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@@ -61,59 +61,13 @@ static byte _dirty_blocks[DIRTY_BYTES_PER_LINE * MAX_SCREEN_HEIGHT / 8];
void GfxScroll(int left, int top, int width, int height, int xo, int yo)
{
Blitter *blitter = BlitterFactoryBase::GetCurrentBlitter();
const void *src;
void *dst;
if (xo == 0 && yo == 0) return;
if (_cursor.visible) UndrawMouseCursor();
UndrawTextMessage();
if (yo > 0) {
/*Calculate pointers */
dst = blitter->MoveTo(_screen.dst_ptr, left, top + height - 1);
src = blitter->MoveTo(dst, 0, -yo);
/* Decrease height and increase top */
top += yo;
height -= yo;
assert(height > 0);
/* Adjust left & width */
if (xo >= 0) {
dst = blitter->MoveTo(dst, xo, 0);
left += xo;
width -= xo;
} else {
src = blitter->MoveTo(src, -xo, 0);
width += xo;
}
/* Negative height as we want to copy from bottom to top */
blitter->CopyFromBuffer(dst, src, width, -height, _screen.pitch);
} else {
/* Calculate pointers */
dst = blitter->MoveTo(_screen.dst_ptr, left, top);
src = blitter->MoveTo(dst, 0, -yo);
/* Decrese height. (yo is <=0). */
height += yo;
assert(height > 0);
/* Adjust left & width */
if (xo >= 0) {
dst = blitter->MoveTo(dst, xo, 0);
left += xo;
width -= xo;
} else {
src = blitter->MoveTo(src, -xo, 0);
width += xo;
}
/* the y-displacement may be 0 therefore we have to use memmove,
* because source and destination may overlap */
blitter->MoveBuffer(dst, src, width, height);
}
blitter->ScrollBuffer(_screen.dst_ptr, left, top, width, height, xo, yo);
/* This part of the screen is now dirty. */
_video_driver->make_dirty(left, top, width, height);
}