Rev 468 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 468 | giacomo | 1 | /* |
| 2 | * Generic function for frame buffer with packed pixels of any depth. |
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| 3 | * |
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| 4 | * Copyright (C) June 1999 James Simmons |
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| 5 | * |
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| 6 | * This file is subject to the terms and conditions of the GNU General Public |
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| 7 | * License. See the file COPYING in the main directory of this archive for |
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| 8 | * more details. |
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| 9 | * |
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| 10 | * NOTES: |
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| 11 | * |
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| 12 | * This is for cfb packed pixels. Iplan and such are incorporated in the |
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| 13 | * drivers that need them. |
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| 14 | * |
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| 15 | * FIXME |
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| 16 | * The code for 24 bit is horrible. It copies byte by byte size instead of |
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| 17 | * longs like the other sizes. Needs to be optimized. |
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| 18 | * |
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| 19 | * Also need to add code to deal with cards endians that are different than |
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| 20 | * the native cpu endians. I also need to deal with MSB position in the word. |
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| 21 | * |
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| 22 | */ |
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| 23 | |||
| 24 | #include <linuxcomp.h> |
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| 25 | |||
| 26 | #include <linux/config.h> |
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| 27 | #include <linux/module.h> |
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| 28 | #include <linux/kernel.h> |
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| 29 | #include <linux/string.h> |
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| 30 | #include <linux/fb.h> |
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| 31 | #include <linux/slab.h> |
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| 32 | #include <asm/types.h> |
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| 33 | #include <asm/io.h> |
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| 34 | |||
| 35 | #define LONG_MASK (BITS_PER_LONG - 1) |
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| 36 | |||
| 37 | #if BITS_PER_LONG == 32 |
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| 38 | #define FB_WRITEL fb_writel |
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| 39 | #define FB_READL fb_readl |
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| 40 | #define SHIFT_PER_LONG 5 |
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| 41 | #define BYTES_PER_LONG 4 |
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| 42 | #else |
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| 43 | #define FB_WRITEL fb_writeq |
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| 44 | #define FB_READL fb_readq |
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| 45 | #define SHIFT_PER_LONG 6 |
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| 46 | #define BYTES_PER_LONG 8 |
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| 47 | #endif |
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| 48 | |||
| 49 | static void bitcpy(unsigned long *dst, int dst_idx, const unsigned long *src, |
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| 50 | int src_idx, unsigned long n) |
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| 51 | { |
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| 52 | unsigned long first, last; |
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| 53 | int shift = dst_idx-src_idx, left, right; |
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| 54 | unsigned long d0, d1; |
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| 55 | int m; |
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| 56 | |||
| 57 | if (!n) |
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| 58 | return; |
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| 59 | |||
| 60 | shift = dst_idx-src_idx; |
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| 61 | first = ~0UL >> dst_idx; |
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| 62 | last = ~(~0UL >> ((dst_idx+n) % BITS_PER_LONG)); |
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| 63 | |||
| 64 | if (!shift) { |
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| 65 | // Same alignment for source and dest |
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| 66 | |||
| 67 | if (dst_idx+n <= BITS_PER_LONG) { |
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| 68 | // Single word |
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| 69 | if (last) |
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| 70 | first &= last; |
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| 71 | FB_WRITEL((FB_READL(src) & first) | (FB_READL(dst) & ~first), dst); |
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| 72 | } else { |
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| 73 | // Multiple destination words |
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| 74 | // Leading bits |
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| 75 | if (first) { |
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| 76 | |||
| 77 | FB_WRITEL((FB_READL(src) & first) | |
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| 78 | (FB_READL(dst) & ~first), dst); |
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| 79 | dst++; |
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| 80 | src++; |
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| 81 | n -= BITS_PER_LONG-dst_idx; |
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| 82 | } |
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| 83 | |||
| 84 | // Main chunk |
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| 85 | n /= BITS_PER_LONG; |
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| 86 | while (n >= 8) { |
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| 87 | FB_WRITEL(FB_READL(src++), dst++); |
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| 88 | FB_WRITEL(FB_READL(src++), dst++); |
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| 89 | FB_WRITEL(FB_READL(src++), dst++); |
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| 90 | FB_WRITEL(FB_READL(src++), dst++); |
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| 91 | FB_WRITEL(FB_READL(src++), dst++); |
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| 92 | FB_WRITEL(FB_READL(src++), dst++); |
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| 93 | FB_WRITEL(FB_READL(src++), dst++); |
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| 94 | FB_WRITEL(FB_READL(src++), dst++); |
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| 95 | n -= 8; |
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| 96 | } |
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| 97 | while (n--) |
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| 98 | FB_WRITEL(FB_READL(src++), dst++); |
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| 99 | // Trailing bits |
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| 100 | if (last) |
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| 101 | FB_WRITEL((FB_READL(src) & last) | (FB_READL(dst) & ~last), dst); |
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| 102 | } |
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| 103 | } else { |
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| 104 | // Different alignment for source and dest |
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| 105 | |||
| 106 | right = shift & (BITS_PER_LONG-1); |
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| 107 | left = -shift & (BITS_PER_LONG-1); |
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| 108 | |||
| 109 | if (dst_idx+n <= BITS_PER_LONG) { |
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| 110 | // Single destination word |
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| 111 | if (last) |
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| 112 | first &= last; |
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| 113 | if (shift > 0) { |
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| 114 | // Single source word |
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| 115 | FB_WRITEL(((FB_READL(src) >> right) & first) | |
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| 116 | (FB_READL(dst) & ~first), dst); |
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| 117 | } else if (src_idx+n <= BITS_PER_LONG) { |
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| 118 | // Single source word |
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| 119 | FB_WRITEL(((FB_READL(src) << left) & first) | |
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| 120 | (FB_READL(dst) & ~first), dst); |
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| 121 | } else { |
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| 122 | // 2 source words |
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| 123 | d0 = FB_READL(src++); |
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| 124 | d1 = FB_READL(src); |
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| 125 | FB_WRITEL(((d0<<left | d1>>right) & first) | |
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| 126 | (FB_READL(dst) & ~first), dst); |
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| 127 | } |
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| 128 | } else { |
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| 129 | // Multiple destination words |
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| 130 | d0 = FB_READL(src++); |
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| 131 | // Leading bits |
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| 132 | if (shift > 0) { |
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| 133 | // Single source word |
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| 134 | FB_WRITEL(((d0 >> right) & first) | |
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| 135 | (FB_READL(dst) & ~first), dst); |
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| 136 | dst++; |
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| 137 | n -= BITS_PER_LONG-dst_idx; |
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| 138 | } else { |
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| 139 | // 2 source words |
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| 140 | d1 = FB_READL(src++); |
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| 141 | FB_WRITEL(((d0<<left | d1>>right) & first) | |
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| 142 | (FB_READL(dst) & ~first), dst); |
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| 143 | d0 = d1; |
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| 144 | dst++; |
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| 145 | n -= BITS_PER_LONG-dst_idx; |
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| 146 | } |
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| 147 | |||
| 148 | // Main chunk |
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| 149 | m = n % BITS_PER_LONG; |
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| 150 | n /= BITS_PER_LONG; |
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| 151 | while (n >= 4) { |
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| 152 | d1 = FB_READL(src++); |
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| 153 | FB_WRITEL(d0 << left | d1 >> right, dst++); |
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| 154 | d0 = d1; |
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| 155 | d1 = FB_READL(src++); |
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| 156 | FB_WRITEL(d0 << left | d1 >> right, dst++); |
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| 157 | d0 = d1; |
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| 158 | d1 = FB_READL(src++); |
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| 159 | FB_WRITEL(d0 << left | d1 >> right, dst++); |
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| 160 | d0 = d1; |
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| 161 | d1 = FB_READL(src++); |
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| 162 | FB_WRITEL(d0 << left | d1 >> right, dst++); |
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| 163 | d0 = d1; |
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| 164 | n -= 4; |
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| 165 | } |
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| 166 | while (n--) { |
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| 167 | d1 = FB_READL(src++); |
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| 168 | FB_WRITEL(d0 << left | d1 >> right, dst++); |
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| 169 | d0 = d1; |
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| 170 | } |
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| 171 | |||
| 172 | // Trailing bits |
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| 173 | if (last) { |
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| 174 | if (m <= right) { |
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| 175 | // Single source word |
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| 176 | FB_WRITEL(((d0 << left) & last) | |
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| 177 | (FB_READL(dst) & ~last), |
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| 178 | dst); |
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| 179 | } else { |
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| 180 | // 2 source words |
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| 181 | d1 = FB_READL(src); |
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| 182 | FB_WRITEL(((d0<<left | d1>>right) & |
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| 183 | last) | (FB_READL(dst) & |
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| 184 | ~last), dst); |
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| 185 | } |
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| 186 | } |
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| 187 | } |
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| 188 | } |
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| 189 | } |
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| 190 | |||
| 191 | static void bitcpy_rev(unsigned long *dst, int dst_idx, |
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| 192 | const unsigned long *src, int src_idx, unsigned long n) |
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| 193 | { |
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| 194 | unsigned long first, last; |
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| 195 | int shift = dst_idx-src_idx, left, right; |
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| 196 | unsigned long d0, d1; |
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| 197 | int m; |
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| 198 | |||
| 199 | if (!n) |
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| 200 | return; |
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| 201 | |||
| 202 | dst += (n-1)/BITS_PER_LONG; |
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| 203 | src += (n-1)/BITS_PER_LONG; |
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| 204 | if ((n-1) % BITS_PER_LONG) { |
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| 205 | dst_idx += (n-1) % BITS_PER_LONG; |
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| 206 | dst += dst_idx >> SHIFT_PER_LONG; |
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| 207 | dst_idx &= BITS_PER_LONG-1; |
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| 208 | src_idx += (n-1) % BITS_PER_LONG; |
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| 209 | src += src_idx >> SHIFT_PER_LONG; |
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| 210 | src_idx &= BITS_PER_LONG-1; |
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| 211 | } |
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| 212 | |||
| 213 | shift = dst_idx-src_idx; |
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| 214 | first = ~0UL << (BITS_PER_LONG-1-dst_idx); |
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| 215 | last = ~(~0UL << (BITS_PER_LONG-1-((dst_idx-n) % BITS_PER_LONG))); |
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| 216 | |||
| 217 | if (!shift) { |
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| 218 | // Same alignment for source and dest |
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| 219 | |||
| 220 | if ((unsigned long)dst_idx+1 >= n) { |
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| 221 | // Single word |
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| 222 | if (last) |
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| 223 | first &= last; |
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| 224 | FB_WRITEL((FB_READL(src) & first) | (FB_READL(dst) & ~first), dst); |
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| 225 | } else { |
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| 226 | // Multiple destination words |
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| 227 | // Leading bits |
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| 228 | if (first) { |
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| 229 | FB_WRITEL((FB_READL(src) & first) | (FB_READL(dst) & ~first), dst); |
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| 230 | dst--; |
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| 231 | src--; |
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| 232 | n -= dst_idx+1; |
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| 233 | } |
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| 234 | |||
| 235 | // Main chunk |
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| 236 | n /= BITS_PER_LONG; |
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| 237 | while (n >= 8) { |
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| 238 | FB_WRITEL(FB_READL(src--), dst--); |
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| 239 | FB_WRITEL(FB_READL(src--), dst--); |
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| 240 | FB_WRITEL(FB_READL(src--), dst--); |
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| 241 | FB_WRITEL(FB_READL(src--), dst--); |
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| 242 | FB_WRITEL(FB_READL(src--), dst--); |
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| 243 | FB_WRITEL(FB_READL(src--), dst--); |
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| 244 | FB_WRITEL(FB_READL(src--), dst--); |
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| 245 | FB_WRITEL(FB_READL(src--), dst--); |
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| 246 | n -= 8; |
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| 247 | } |
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| 248 | while (n--) |
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| 249 | FB_WRITEL(FB_READL(src--), dst--); |
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| 250 | |||
| 251 | // Trailing bits |
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| 252 | if (last) |
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| 253 | FB_WRITEL((FB_READL(src) & last) | (FB_READL(dst) & ~last), dst); |
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| 254 | } |
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| 255 | } else { |
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| 256 | // Different alignment for source and dest |
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| 257 | |||
| 258 | right = shift & (BITS_PER_LONG-1); |
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| 259 | left = -shift & (BITS_PER_LONG-1); |
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| 260 | |||
| 261 | if ((unsigned long)dst_idx+1 >= n) { |
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| 262 | // Single destination word |
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| 263 | if (last) |
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| 264 | first &= last; |
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| 265 | if (shift < 0) { |
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| 266 | // Single source word |
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| 267 | FB_WRITEL((FB_READL(src) << left & first) | |
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| 268 | (FB_READL(dst) & ~first), dst); |
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| 269 | } else if (1+(unsigned long)src_idx >= n) { |
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| 270 | // Single source word |
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| 271 | FB_WRITEL(((FB_READL(src) >> right) & first) | |
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| 272 | (FB_READL(dst) & ~first), dst); |
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| 273 | } else { |
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| 274 | // 2 source words |
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| 275 | d0 = FB_READL(src--); |
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| 276 | d1 = FB_READL(src); |
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| 277 | FB_WRITEL(((d0>>right | d1<<left) & first) | |
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| 278 | (FB_READL(dst) & ~first), dst); |
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| 279 | } |
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| 280 | } else { |
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| 281 | // Multiple destination words |
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| 282 | d0 = FB_READL(src--); |
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| 283 | // Leading bits |
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| 284 | if (shift < 0) { |
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| 285 | // Single source word |
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| 286 | FB_WRITEL(((d0 << left) & first) | |
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| 287 | (FB_READL(dst) & ~first), dst); |
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| 288 | dst--; |
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| 289 | n -= dst_idx+1; |
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| 290 | } else { |
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| 291 | // 2 source words |
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| 292 | d1 = FB_READL(src--); |
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| 293 | FB_WRITEL(((d0>>right | d1<<left) & first) | |
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| 294 | (FB_READL(dst) & ~first), dst); |
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| 295 | d0 = d1; |
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| 296 | dst--; |
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| 297 | n -= dst_idx+1; |
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| 298 | } |
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| 299 | |||
| 300 | // Main chunk |
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| 301 | m = n % BITS_PER_LONG; |
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| 302 | n /= BITS_PER_LONG; |
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| 303 | while (n >= 4) { |
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| 304 | d1 = FB_READL(src--); |
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| 305 | FB_WRITEL(d0 >> right | d1 << left, dst--); |
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| 306 | d0 = d1; |
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| 307 | d1 = FB_READL(src--); |
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| 308 | FB_WRITEL(d0 >> right | d1 << left, dst--); |
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| 309 | d0 = d1; |
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| 310 | d1 = FB_READL(src--); |
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| 311 | FB_WRITEL(d0 >> right | d1 << left, dst--); |
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| 312 | d0 = d1; |
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| 313 | d1 = FB_READL(src--); |
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| 314 | FB_WRITEL(d0 >> right | d1 << left, dst--); |
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| 315 | d0 = d1; |
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| 316 | n -= 4; |
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| 317 | } |
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| 318 | while (n--) { |
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| 319 | d1 = FB_READL(src--); |
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| 320 | FB_WRITEL(d0 >> right | d1 << left, dst--); |
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| 321 | d0 = d1; |
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| 322 | } |
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| 323 | |||
| 324 | // Trailing bits |
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| 325 | if (last) { |
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| 326 | if (m <= left) { |
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| 327 | // Single source word |
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| 328 | FB_WRITEL(((d0 >> right) & last) | |
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| 329 | (FB_READL(dst) & ~last), |
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| 330 | dst); |
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| 331 | } else { |
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| 332 | // 2 source words |
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| 333 | d1 = FB_READL(src); |
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| 334 | FB_WRITEL(((d0>>right | d1<<left) & |
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| 335 | last) | (FB_READL(dst) & |
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| 336 | ~last), dst); |
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| 337 | } |
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| 338 | } |
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| 339 | } |
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| 340 | } |
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| 341 | } |
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| 342 | |||
| 343 | void cfb_copyarea(struct fb_info *p, const struct fb_copyarea *area) |
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| 344 | { |
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| 345 | u32 dx = area->dx, dy = area->dy, sx = area->sx, sy = area->sy; |
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| 346 | u32 height = area->height, width = area->width; |
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| 347 | int x2, y2, old_dx, old_dy, vxres, vyres; |
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| 348 | unsigned long next_line = p->fix.line_length; |
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| 349 | int dst_idx = 0, src_idx = 0, rev_copy = 0; |
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| 350 | unsigned long *dst = NULL, *src = NULL; |
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| 351 | |||
| 352 | /* We want rotation but lack hardware to do it for us. */ |
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| 353 | if (!p->fbops->fb_rotate && p->var.rotate) { |
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| 354 | } |
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| 355 | |||
| 356 | vxres = p->var.xres_virtual; |
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| 357 | vyres = p->var.yres_virtual; |
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| 358 | |||
| 359 | if (area->dx > vxres || area->sx > vxres || |
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| 360 | area->dy > vyres || area->sy > vyres) |
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| 361 | return; |
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| 362 | |||
| 363 | /* clip the destination */ |
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| 364 | old_dx = area->dx; |
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| 365 | old_dy = area->dy; |
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| 366 | |||
| 367 | /* |
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| 368 | * We could use hardware clipping but on many cards you get around |
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| 369 | * hardware clipping by writing to framebuffer directly. |
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| 370 | */ |
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| 371 | x2 = area->dx + area->width; |
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| 372 | y2 = area->dy + area->height; |
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| 373 | dx = area->dx > 0 ? area->dx : 0; |
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| 374 | dy = area->dy > 0 ? area->dy : 0; |
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| 375 | x2 = x2 < vxres ? x2 : vxres; |
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| 376 | y2 = y2 < vyres ? y2 : vyres; |
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| 377 | width = x2 - dx; |
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| 378 | height = y2 - dy; |
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| 379 | |||
| 380 | /* update sx1,sy1 */ |
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| 381 | sx += (dx - old_dx); |
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| 382 | sy += (dy - old_dy); |
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| 383 | |||
| 384 | /* the source must be completely inside the virtual screen */ |
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| 385 | if (sx < 0 || sy < 0 || |
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| 386 | (sx + width) > vxres || |
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| 387 | (sy + height) > vyres) |
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| 388 | return; |
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| 389 | |||
| 390 | if ((dy == sy && dx > sx) || |
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| 391 | (dy > sy)) { |
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| 392 | dy += height; |
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| 393 | sy += height; |
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| 394 | rev_copy = 1; |
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| 395 | } |
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| 396 | |||
| 397 | dst = src = (unsigned long *)((unsigned long)p->screen_base & |
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| 398 | ~(BYTES_PER_LONG-1)); |
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| 399 | dst_idx = src_idx = (unsigned long)p->screen_base & (BYTES_PER_LONG-1); |
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| 400 | dst_idx += dy*next_line*8 + dx*p->var.bits_per_pixel; |
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| 401 | src_idx += sy*next_line*8 + sx*p->var.bits_per_pixel; |
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| 402 | |||
| 403 | if (p->fbops->fb_sync) |
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| 404 | p->fbops->fb_sync(p); |
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| 405 | if (rev_copy) { |
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| 406 | while (height--) { |
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| 407 | dst_idx -= next_line*8; |
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| 408 | src_idx -= next_line*8; |
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| 409 | dst += dst_idx >> SHIFT_PER_LONG; |
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| 410 | dst_idx &= (BYTES_PER_LONG-1); |
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| 411 | src += src_idx >> SHIFT_PER_LONG; |
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| 412 | src_idx &= (BYTES_PER_LONG-1); |
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| 413 | bitcpy_rev(dst, dst_idx, src, src_idx, |
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| 414 | width*p->var.bits_per_pixel); |
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| 415 | } |
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| 416 | } else { |
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| 417 | while (height--) { |
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| 418 | dst += dst_idx >> SHIFT_PER_LONG; |
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| 419 | dst_idx &= (BYTES_PER_LONG-1); |
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| 420 | src += src_idx >> SHIFT_PER_LONG; |
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| 421 | src_idx &= (BYTES_PER_LONG-1); |
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| 422 | bitcpy(dst, dst_idx, src, src_idx, |
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| 423 | width*p->var.bits_per_pixel); |
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| 424 | dst_idx += next_line*8; |
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| 425 | src_idx += next_line*8; |
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| 426 | } |
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| 427 | } |
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| 428 | } |
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| 429 | |||
| 430 | EXPORT_SYMBOL(cfb_copyarea); |
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| 431 | |||
| 432 | MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>"); |
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| 433 | MODULE_DESCRIPTION("Generic software accelerated copyarea"); |
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| 434 | MODULE_LICENSE("GPL"); |
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| 435 |