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authorPavel Pisa <pisa@cmp.felk.cvut.cz>2007-10-16 01:29:21 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:43:19 -0700
commit779121e9f17525769c04a00475fd85600c8c04eb (patch)
tree757aad067bed869bfdd2dc2eb2f652a7f4e5e071 /drivers/video/cfbimgblt.c
parent3c03ec209af1dd8223888630482f1b2353dc6284 (diff)
fbdev: Support for byte-reversed framebuffer formats
Allow generic frame-buffer code to correctly write texts and blit images for 1, 2 and 4 bit per pixel frame-buffer organizations when pixels in bytes are organized to in opposite order than bytes in long type. Overhead should be reasonable. If option is not selected, than compiler should eliminate completely all overhead. The feature is disabled at compile time if CONFIG_FB_CFB_REV_PIXELS_IN_BYTE is not set. [adaplas] Convert helper functions to macros if feature is not enabled. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz> Signed-off-by: Antonino Daplas <adaplas@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/video/cfbimgblt.c')
-rw-r--r--drivers/video/cfbimgblt.c17
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/video/cfbimgblt.c b/drivers/video/cfbimgblt.c
index 261004473c8e..f598907b42ad 100644
--- a/drivers/video/cfbimgblt.c
+++ b/drivers/video/cfbimgblt.c
@@ -33,6 +33,7 @@
#include <linux/string.h>
#include <linux/fb.h>
#include <asm/types.h>
+#include "fb_draw.h"
#define DEBUG
@@ -87,6 +88,7 @@ static inline void color_imageblit(const struct fb_image *image,
u32 null_bits = 32 - bpp;
u32 *palette = (u32 *) p->pseudo_palette;
const u8 *src = image->data;
+ u32 bswapmask = fb_compute_bswapmask(p);
dst2 = (u32 __iomem *) dst1;
for (i = image->height; i--; ) {
@@ -96,7 +98,7 @@ static inline void color_imageblit(const struct fb_image *image,
val = 0;
if (start_index) {
- u32 start_mask = ~(FB_SHIFT_HIGH(~(u32)0, start_index));
+ u32 start_mask = ~fb_shifted_pixels_mask_u32(start_index, bswapmask);
val = FB_READL(dst) & start_mask;
shift = start_index;
}
@@ -107,7 +109,7 @@ static inline void color_imageblit(const struct fb_image *image,
else
color = *src;
color <<= FB_LEFT_POS(bpp);
- val |= FB_SHIFT_HIGH(color, shift);
+ val |= FB_SHIFT_HIGH(color, shift ^ bswapmask);
if (shift >= null_bits) {
FB_WRITEL(val, dst++);
@@ -119,7 +121,7 @@ static inline void color_imageblit(const struct fb_image *image,
src++;
}
if (shift) {
- u32 end_mask = FB_SHIFT_HIGH(~(u32)0, shift);
+ u32 end_mask = fb_shifted_pixels_mask_u32(shift, bswapmask);
FB_WRITEL((FB_READL(dst) & end_mask) | val, dst);
}
@@ -147,7 +149,8 @@ static inline void slow_imageblit(const struct fb_image *image, struct fb_info *
u32 spitch = (image->width+7)/8;
const u8 *src = image->data, *s;
u32 i, j, l;
-
+ u32 bswapmask = fb_compute_bswapmask(p);
+
dst2 = (u32 __iomem *) dst1;
fgcolor <<= FB_LEFT_POS(bpp);
bgcolor <<= FB_LEFT_POS(bpp);
@@ -161,7 +164,7 @@ static inline void slow_imageblit(const struct fb_image *image, struct fb_info *
/* write leading bits */
if (start_index) {
- u32 start_mask = ~(FB_SHIFT_HIGH(~(u32)0,start_index));
+ u32 start_mask = ~fb_shifted_pixels_mask_u32(start_index, bswapmask);
val = FB_READL(dst) & start_mask;
shift = start_index;
}
@@ -169,7 +172,7 @@ static inline void slow_imageblit(const struct fb_image *image, struct fb_info *
while (j--) {
l--;
color = (*s & (1 << l)) ? fgcolor : bgcolor;
- val |= FB_SHIFT_HIGH(color, shift);
+ val |= FB_SHIFT_HIGH(color, shift ^ bswapmask);
/* Did the bitshift spill bits to the next long? */
if (shift >= null_bits) {
@@ -184,7 +187,7 @@ static inline void slow_imageblit(const struct fb_image *image, struct fb_info *
/* write trailing bits */
if (shift) {
- u32 end_mask = FB_SHIFT_HIGH(~(u32)0, shift);
+ u32 end_mask = fb_shifted_pixels_mask_u32(shift, bswapmask);
FB_WRITEL((FB_READL(dst) & end_mask) | val, dst);
}