linux/drivers/video/fb_draw.h
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   1#ifndef _FB_DRAW_H
   2#define _FB_DRAW_H
   3
   4#include <asm/types.h>
   5#include <linux/fb.h>
   6#include <linux/bug.h>
   7
   8    /*
   9     *  Compose two values, using a bitmask as decision value
  10     *  This is equivalent to (a & mask) | (b & ~mask)
  11     */
  12
  13static inline unsigned long
  14comp(unsigned long a, unsigned long b, unsigned long mask)
  15{
  16    return ((a ^ b) & mask) ^ b;
  17}
  18
  19    /*
  20     *  Create a pattern with the given pixel's color
  21     */
  22
  23#if BITS_PER_LONG == 64
  24static inline unsigned long
  25pixel_to_pat( u32 bpp, u32 pixel)
  26{
  27        switch (bpp) {
  28        case 1:
  29                return 0xfffffffffffffffful*pixel;
  30        case 2:
  31                return 0x5555555555555555ul*pixel;
  32        case 4:
  33                return 0x1111111111111111ul*pixel;
  34        case 8:
  35                return 0x0101010101010101ul*pixel;
  36        case 12:
  37                return 0x1001001001001001ul*pixel;
  38        case 16:
  39                return 0x0001000100010001ul*pixel;
  40        case 24:
  41                return 0x0001000001000001ul*pixel;
  42        case 32:
  43                return 0x0000000100000001ul*pixel;
  44        default:
  45                WARN(1, "pixel_to_pat(): unsupported pixelformat %d\n", bpp);
  46                return 0;
  47    }
  48}
  49#else
  50static inline unsigned long
  51pixel_to_pat( u32 bpp, u32 pixel)
  52{
  53        switch (bpp) {
  54        case 1:
  55                return 0xfffffffful*pixel;
  56        case 2:
  57                return 0x55555555ul*pixel;
  58        case 4:
  59                return 0x11111111ul*pixel;
  60        case 8:
  61                return 0x01010101ul*pixel;
  62        case 12:
  63                return 0x01001001ul*pixel;
  64        case 16:
  65                return 0x00010001ul*pixel;
  66        case 24:
  67                return 0x01000001ul*pixel;
  68        case 32:
  69                return 0x00000001ul*pixel;
  70        default:
  71                WARN(1, "pixel_to_pat(): unsupported pixelformat %d\n", bpp);
  72                return 0;
  73    }
  74}
  75#endif
  76
  77#ifdef CONFIG_FB_CFB_REV_PIXELS_IN_BYTE
  78#if BITS_PER_LONG == 64
  79#define REV_PIXELS_MASK1 0x5555555555555555ul
  80#define REV_PIXELS_MASK2 0x3333333333333333ul
  81#define REV_PIXELS_MASK4 0x0f0f0f0f0f0f0f0ful
  82#else
  83#define REV_PIXELS_MASK1 0x55555555ul
  84#define REV_PIXELS_MASK2 0x33333333ul
  85#define REV_PIXELS_MASK4 0x0f0f0f0ful
  86#endif
  87
  88static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
  89                                                  u32 bswapmask)
  90{
  91        if (bswapmask & 1)
  92                val = comp(val >> 1, val << 1, REV_PIXELS_MASK1);
  93        if (bswapmask & 2)
  94                val = comp(val >> 2, val << 2, REV_PIXELS_MASK2);
  95        if (bswapmask & 3)
  96                val = comp(val >> 4, val << 4, REV_PIXELS_MASK4);
  97        return val;
  98}
  99
 100static inline u32 fb_shifted_pixels_mask_u32(struct fb_info *p, u32 index,
 101                                             u32 bswapmask)
 102{
 103        u32 mask;
 104
 105        if (!bswapmask) {
 106                mask = FB_SHIFT_HIGH(p, ~(u32)0, index);
 107        } else {
 108                mask = 0xff << FB_LEFT_POS(p, 8);
 109                mask = FB_SHIFT_LOW(p, mask, index & (bswapmask)) & mask;
 110                mask = FB_SHIFT_HIGH(p, mask, index & ~(bswapmask));
 111#if defined(__i386__) || defined(__x86_64__)
 112                /* Shift argument is limited to 0 - 31 on x86 based CPU's */
 113                if(index + bswapmask < 32)
 114#endif
 115                        mask |= FB_SHIFT_HIGH(p, ~(u32)0,
 116                                        (index + bswapmask) & ~(bswapmask));
 117        }
 118        return mask;
 119}
 120
 121static inline unsigned long fb_shifted_pixels_mask_long(struct fb_info *p,
 122                                                        u32 index,
 123                                                        u32 bswapmask)
 124{
 125        unsigned long mask;
 126
 127        if (!bswapmask) {
 128                mask = FB_SHIFT_HIGH(p, ~0UL, index);
 129        } else {
 130                mask = 0xff << FB_LEFT_POS(p, 8);
 131                mask = FB_SHIFT_LOW(p, mask, index & (bswapmask)) & mask;
 132                mask = FB_SHIFT_HIGH(p, mask, index & ~(bswapmask));
 133#if defined(__i386__) || defined(__x86_64__)
 134                /* Shift argument is limited to 0 - 31 on x86 based CPU's */
 135                if(index + bswapmask < BITS_PER_LONG)
 136#endif
 137                        mask |= FB_SHIFT_HIGH(p, ~0UL,
 138                                        (index + bswapmask) & ~(bswapmask));
 139        }
 140        return mask;
 141}
 142
 143
 144static inline u32 fb_compute_bswapmask(struct fb_info *info)
 145{
 146        u32 bswapmask = 0;
 147        unsigned bpp = info->var.bits_per_pixel;
 148
 149        if ((bpp < 8) && (info->var.nonstd & FB_NONSTD_REV_PIX_IN_B)) {
 150                /*
 151                 * Reversed order of pixel layout in bytes
 152                 * works only for 1, 2 and 4 bpp
 153                 */
 154                bswapmask = 7 - bpp + 1;
 155        }
 156        return bswapmask;
 157}
 158
 159#else /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
 160
 161static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
 162                                                  u32 bswapmask)
 163{
 164        return val;
 165}
 166
 167#define fb_shifted_pixels_mask_u32(p, i, b) FB_SHIFT_HIGH((p), ~(u32)0, (i))
 168#define fb_shifted_pixels_mask_long(p, i, b) FB_SHIFT_HIGH((p), ~0UL, (i))
 169#define fb_compute_bswapmask(...) 0
 170
 171#endif  /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
 172
 173#define cpu_to_le_long _cpu_to_le_long(BITS_PER_LONG)
 174#define _cpu_to_le_long(x) __cpu_to_le_long(x)
 175#define __cpu_to_le_long(x) cpu_to_le##x
 176
 177#define le_long_to_cpu _le_long_to_cpu(BITS_PER_LONG)
 178#define _le_long_to_cpu(x) __le_long_to_cpu(x)
 179#define __le_long_to_cpu(x) le##x##_to_cpu
 180
 181static inline unsigned long rolx(unsigned long word, unsigned int shift, unsigned int x)
 182{
 183        return (word << shift) | (word >> (x - shift));
 184}
 185
 186#endif /* FB_DRAW_H */
 187
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