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path: root/drivers/video/fb_draw.h
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Diffstat (limited to 'drivers/video/fb_draw.h')
-rw-r--r--drivers/video/fb_draw.h68
1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/video/fb_draw.h b/drivers/video/fb_draw.h
index c5c45203833b..816843f06bb7 100644
--- a/drivers/video/fb_draw.h
+++ b/drivers/video/fb_draw.h
@@ -2,6 +2,7 @@
#define _FB_DRAW_H
#include <asm/types.h>
+#include <linux/fb.h>
/*
* Compose two values, using a bitmask as decision value
@@ -69,4 +70,71 @@ pixel_to_pat( u32 bpp, u32 pixel)
}
}
#endif
+
+#ifdef CONFIG_FB_CFB_REV_PIXELS_IN_BYTE
+
+static inline u32 fb_shifted_pixels_mask_u32(u32 index, u32 bswapmask)
+{
+ u32 mask;
+
+ if (!bswapmask) {
+ mask = FB_SHIFT_HIGH(~(u32)0, index);
+ } else {
+ mask = 0xff << FB_LEFT_POS(8);
+ mask = FB_SHIFT_LOW(mask, index & (bswapmask)) & mask;
+ mask = FB_SHIFT_HIGH(mask, index & ~(bswapmask));
+#if defined(__i386__) || defined(__x86_64__)
+ /* Shift argument is limited to 0 - 31 on x86 based CPU's */
+ if(index + bswapmask < 32)
+#endif
+ mask |= FB_SHIFT_HIGH(~(u32)0,
+ (index + bswapmask) & ~(bswapmask));
+ }
+ return mask;
+}
+
+static inline unsigned long fb_shifted_pixels_mask_long(u32 index, u32 bswapmask)
+{
+ unsigned long mask;
+
+ if (!bswapmask) {
+ mask = FB_SHIFT_HIGH(~0UL, index);
+ } else {
+ mask = 0xff << FB_LEFT_POS(8);
+ mask = FB_SHIFT_LOW(mask, index & (bswapmask)) & mask;
+ mask = FB_SHIFT_HIGH(mask, index & ~(bswapmask));
+#if defined(__i386__) || defined(__x86_64__)
+ /* Shift argument is limited to 0 - 31 on x86 based CPU's */
+ if(index + bswapmask < BITS_PER_LONG)
+#endif
+ mask |= FB_SHIFT_HIGH(~0UL,
+ (index + bswapmask) & ~(bswapmask));
+ }
+ return mask;
+}
+
+
+static inline u32 fb_compute_bswapmask(struct fb_info *info)
+{
+ u32 bswapmask = 0;
+ unsigned bpp = info->var.bits_per_pixel;
+
+ if ((bpp < 8) && (info->var.nonstd & FB_NONSTD_REV_PIX_IN_B)) {
+ /*
+ * Reversed order of pixel layout in bytes
+ * works only for 1, 2 and 4 bpp
+ */
+ bswapmask = 7 - bpp + 1;
+ }
+ return bswapmask;
+}
+
+#else /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
+
+#define fb_shifted_pixels_mask_u32(i, b) FB_SHIFT_HIGH(~(u32)0, (i))
+#define fb_shifted_pixels_mask_long(i, b) FB_SHIFT_HIGH(~0UL, (i))
+#define fb_compute_bswapmask(...) 0
+
+#endif /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
+
#endif /* FB_DRAW_H */