diff options
Diffstat (limited to 'drivers/video/fb_draw.h')
| -rw-r--r-- | drivers/video/fb_draw.h | 68 |
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 */ |