[PATCH] fbdev: Remove software clipping from drawing functions

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>

3 files changed, 3 insertions, 79 deletions

diff --git a/drivers/video/cfbcopyarea.c b/drivers/video/cfbcopyarea.c
index 67711f7b11b1..cdc71572cf35 100644
--- a/drivers/video/cfbcopyarea.c
+++ b/drivers/video/cfbcopyarea.c
@@ -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)) {
diff --git a/drivers/video/cfbfillrect.c b/drivers/video/cfbfillrect.c
index e4fc42b013eb..167d9314e6eb 100644
--- a/drivers/video/cfbfillrect.c
+++ b/drivers/video/cfbfillrect.c
@@ -344,7 +344,8 @@ bitfill_unaligned_rev(unsigned long __iomem *dst, int dst_idx, unsigned long pat
 
 void cfb_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
 {
-        unsigned long x2, y2, vxres, vyres, height, width, pat, fg;
+        unsigned long pat, fg;
+        unsigned long width = rect->width, height = rect->height;
         int bits = BITS_PER_LONG, bytes = bits >> 3;
         u32 bpp = p->var.bits_per_pixel;
         unsigned long __iomem *dst;
@@ -353,27 +354,6 @@ void cfb_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
         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 (!rect->width || !rect->height ||
-            rect->dx > vxres || rect->dy > vyres)
-                return;
-
-        /* We could use hardware clipping but on many cards you get around
-         * hardware clipping by writing to framebuffer directly. */
-
-        x2 = rect->dx + rect->width;
-        y2 = rect->dy + rect->height;
-        x2 = x2 < vxres ? x2 : vxres;
-        y2 = y2 < vyres ? y2 : vyres;
-        width = x2 - rect->dx;
-        height = y2 - rect->dy;
-
         if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
             p->fix.visual == FB_VISUAL_DIRECTCOLOR )
                 fg = ((u32 *) (p->pseudo_palette))[rect->color];
diff --git a/drivers/video/cfbimgblt.c b/drivers/video/cfbimgblt.c
index 4c123abaa843..da664cea7eca 100644
--- a/drivers/video/cfbimgblt.c
+++ b/drivers/video/cfbimgblt.c
@@ -272,33 +272,13 @@ void cfb_imageblit(struct fb_info *p, const struct fb_image *image)
 {
         u32 fgcolor, bgcolor, start_index, bitstart, pitch_index = 0;
         u32 bpl = sizeof(u32), bpp = p->var.bits_per_pixel;
-        u32 width = image->width, height = image->height; 
+        u32 width = image->width;
         u32 dx = image->dx, dy = image->dy;
-        int x2, y2, vxres, vyres;
         u8 __iomem *dst1;
 
         if (p->state != FBINFO_STATE_RUNNING)
                 return;
 
-        vxres = p->var.xres_virtual;
-        vyres = p->var.yres_virtual;
-        /* 
-         * We could use hardware clipping but on many cards you get around
-         * hardware clipping by writing to framebuffer directly like we are
-         * doing here. 
-         */
-        if (image->dx > vxres || image->dy > vyres)
-                return;
-
-        x2 = image->dx + image->width;
-        y2 = image->dy + image->height;
-        dx = image->dx > 0 ? image->dx : 0;
-        dy = image->dy > 0 ? image->dy : 0;
-        x2 = x2 < vxres ? x2 : vxres;
-        y2 = y2 < vyres ? y2 : vyres;
-        width  = x2 - dx;
-        height = y2 - dy;
-
         bitstart = (dy * p->fix.line_length * 8) + (dx * bpp);
         start_index = bitstart & (32 - 1);
         pitch_index = (p->fix.line_length & (bpl - 1)) * 8;