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[PATCH] fbdev: Remove software clipping from drawing functions

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Remove software clipping from imageblit, fillrect and copyarea.  Clipping is
not needed because the console layer assures that reads/writes doest not
happen beyond the extents of the framebuffer.  And software clipping tends to
hide bugs, if they do exist.

Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Antonino A. Daplas
2005-11-07 01:00:39 -08:00
committed by Linus Torvalds
parent dd0314f7bb
commit b4d8aea6d6
3 changed files with 3 additions and 79 deletions
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drivers/video/cfbcopyarea.c
-36
View File
@@ -349,46 +349,10 @@ void cfb_copyarea(struct fb_info *p, const struct fb_copyarea *area)
unsigned long __iomem *dst = NULL, *src = NULL;
int bits = BITS_PER_LONG, bytes = bits >> 3;
int dst_idx = 0, src_idx = 0, rev_copy = 0;
int x2, y2, vxres, vyres;
if (p->state != FBINFO_STATE_RUNNING)
return;
/* We want rotation but lack hardware to do it for us. */
if (!p->fbops->fb_rotate && p->var.rotate) {
}
vxres = p->var.xres_virtual;
vyres = p->var.yres_virtual;
if (area->dx > vxres || area->sx > vxres ||
area->dy > vyres || area->sy > vyres)
return;
/* clip the destination
* We could use hardware clipping but on many cards you get around
* hardware clipping by writing to framebuffer directly.
*/
x2 = area->dx + area->width;
y2 = area->dy + area->height;
dx = area->dx > 0 ? area->dx : 0;
dy = area->dy > 0 ? area->dy : 0;
x2 = x2 < vxres ? x2 : vxres;
y2 = y2 < vyres ? y2 : vyres;
width = x2 - dx;
height = y2 - dy;
if ((width==0) ||(height==0))
return;
/* update sx1,sy1 */
sx += (dx - area->dx);
sy += (dy - area->dy);
/* the source must be completely inside the virtual screen */
if (sx < 0 || sy < 0 || (sx + width) > vxres || (sy + height) > vyres)
return;
/* if the beginning of the target area might overlap with the end of
the source area, be have to copy the area reverse. */
if ((dy == sy && dx > sx) || (dy > sy)) {