epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame^] | 1 | |
| 2 | /* |
| 3 | * Copyright 2011 Google Inc. |
| 4 | * |
| 5 | * Use of this source code is governed by a BSD-style license that can be |
| 6 | * found in the LICENSE file. |
| 7 | */ |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 8 | #include "SkBlitRow.h" |
| 9 | #include "SkColorPriv.h" |
| 10 | #include "SkDither.h" |
| 11 | |
| 12 | /////////////////////////////////////////////////////////////////////////////// |
| 13 | |
| 14 | static void S32_D4444_Opaque(uint16_t* SK_RESTRICT dst, |
| 15 | const SkPMColor* SK_RESTRICT src, int count, |
| 16 | U8CPU alpha, int /*x*/, int /*y*/) { |
| 17 | SkASSERT(255 == alpha); |
| 18 | |
| 19 | if (count > 0) { |
| 20 | do { |
| 21 | SkPMColor c = *src++; |
| 22 | SkPMColorAssert(c); |
| 23 | SkASSERT(SkGetPackedA32(c) == 255); |
| 24 | *dst++ = SkPixel32ToPixel4444(c); |
| 25 | } while (--count != 0); |
| 26 | } |
| 27 | } |
| 28 | |
| 29 | static void S32_D4444_Blend(uint16_t* SK_RESTRICT dst, |
| 30 | const SkPMColor* SK_RESTRICT src, int count, |
| 31 | U8CPU alpha, int /*x*/, int /*y*/) { |
| 32 | SkASSERT(255 > alpha); |
| 33 | |
| 34 | if (count > 0) { |
| 35 | unsigned scale16 = SkAlpha255To256(alpha) >> 4; |
| 36 | do { |
| 37 | SkPMColor c = *src++; |
| 38 | SkPMColorAssert(c); |
| 39 | SkASSERT(SkGetPackedA32(c) == 255); |
| 40 | |
| 41 | uint32_t src_expand = SkExpand32_4444(c); |
| 42 | uint32_t dst_expand = SkExpand_4444(*dst); |
| 43 | dst_expand += (src_expand - dst_expand) * scale16 >> 4; |
| 44 | *dst++ = SkCompact_4444(dst_expand); |
| 45 | } while (--count != 0); |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | static void S32A_D4444_Opaque(uint16_t* SK_RESTRICT dst, |
| 50 | const SkPMColor* SK_RESTRICT src, int count, |
| 51 | U8CPU alpha, int /*x*/, int /*y*/) { |
| 52 | SkASSERT(255 == alpha); |
| 53 | |
| 54 | if (count > 0) { |
| 55 | do { |
| 56 | SkPMColor c = *src++; |
| 57 | SkPMColorAssert(c); |
| 58 | // if (__builtin_expect(c!=0, 1)) |
| 59 | if (c) |
| 60 | { |
| 61 | unsigned scale16 = SkAlpha255To256(255 - SkGetPackedA32(c)) >> 4; |
| 62 | uint32_t src_expand = SkExpand_8888(c); |
| 63 | uint32_t dst_expand = SkExpand_4444(*dst) * scale16; |
| 64 | *dst = SkCompact_4444((src_expand + dst_expand) >> 4); |
| 65 | } |
| 66 | dst += 1; |
| 67 | } while (--count != 0); |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | static void S32A_D4444_Blend(uint16_t* SK_RESTRICT dst, |
| 72 | const SkPMColor* SK_RESTRICT src, int count, |
| 73 | U8CPU alpha, int /*x*/, int /*y*/) { |
| 74 | SkASSERT(255 > alpha); |
| 75 | |
| 76 | if (count > 0) { |
| 77 | int src_scale = SkAlpha255To256(alpha) >> 4; |
| 78 | do { |
| 79 | SkPMColor sc = *src++; |
| 80 | SkPMColorAssert(sc); |
| 81 | |
| 82 | if (sc) { |
| 83 | unsigned dst_scale = 16 - (SkGetPackedA32(sc) * src_scale >> 8); |
| 84 | uint32_t src_expand = SkExpand32_4444(sc) * src_scale; |
| 85 | uint32_t dst_expand = SkExpand_4444(*dst) * dst_scale; |
| 86 | *dst = SkCompact_4444((src_expand + dst_expand) >> 4); |
| 87 | } |
| 88 | dst += 1; |
| 89 | } while (--count != 0); |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | ///////////////////////////////////////////////////////////////////////////// |
| 94 | |
| 95 | static void S32_D4444_Opaque_Dither(uint16_t* SK_RESTRICT dst, |
| 96 | const SkPMColor* SK_RESTRICT src, |
| 97 | int count, U8CPU alpha, int x, int y) { |
| 98 | SkASSERT(255 == alpha); |
| 99 | |
| 100 | if (count > 0) { |
| 101 | DITHER_4444_SCAN(y); |
| 102 | do { |
| 103 | SkPMColor c = *src++; |
| 104 | SkPMColorAssert(c); |
| 105 | SkASSERT(SkGetPackedA32(c) == 255); |
| 106 | |
| 107 | unsigned dither = DITHER_VALUE(x); |
| 108 | *dst++ = SkDitherARGB32To4444(c, dither); |
| 109 | DITHER_INC_X(x); |
| 110 | } while (--count != 0); |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | static void S32_D4444_Blend_Dither(uint16_t* SK_RESTRICT dst, |
| 115 | const SkPMColor* SK_RESTRICT src, |
| 116 | int count, U8CPU alpha, int x, int y) { |
| 117 | SkASSERT(255 > alpha); |
| 118 | |
| 119 | if (count > 0) { |
| 120 | int scale16 = SkAlpha255To256(alpha) >> 4; |
| 121 | DITHER_4444_SCAN(y); |
| 122 | do { |
| 123 | SkPMColor c = *src++; |
| 124 | SkPMColorAssert(c); |
| 125 | SkASSERT(SkGetPackedA32(c) == 255); |
| 126 | |
| 127 | uint32_t src_expand = SkExpand32_4444(c) * scale16; |
| 128 | uint32_t dst_expand = SkExpand_4444(*dst) * (16 - scale16); |
| 129 | |
| 130 | c = SkCompact_8888(src_expand + dst_expand); // convert back to SkPMColor |
| 131 | *dst++ = SkDitherARGB32To4444(c, DITHER_VALUE(x)); |
| 132 | DITHER_INC_X(x); |
| 133 | } while (--count != 0); |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | static void S32A_D4444_Opaque_Dither(uint16_t* SK_RESTRICT dst, |
| 138 | const SkPMColor* SK_RESTRICT src, |
| 139 | int count, U8CPU alpha, int x, int y) { |
| 140 | SkASSERT(255 == alpha); |
| 141 | |
| 142 | if (count > 0) { |
| 143 | DITHER_4444_SCAN(y); |
| 144 | do { |
| 145 | SkPMColor c = *src++; |
| 146 | SkPMColorAssert(c); |
| 147 | if (c) { |
| 148 | unsigned a = SkGetPackedA32(c); |
| 149 | int d = SkAlphaMul(DITHER_VALUE(x), SkAlpha255To256(a)); |
| 150 | |
| 151 | unsigned scale16 = SkAlpha255To256(255 - a) >> 4; |
| 152 | uint32_t src_expand = SkExpand_8888(c); |
| 153 | uint32_t dst_expand = SkExpand_4444(*dst) * scale16; |
| 154 | // convert back to SkPMColor |
| 155 | c = SkCompact_8888(src_expand + dst_expand); |
| 156 | *dst = SkDitherARGB32To4444(c, d); |
| 157 | } |
| 158 | dst += 1; |
| 159 | DITHER_INC_X(x); |
| 160 | } while (--count != 0); |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | // need DitherExpand888To4444(expand, dither) |
| 165 | |
| 166 | static void S32A_D4444_Blend_Dither(uint16_t* SK_RESTRICT dst, |
| 167 | const SkPMColor* SK_RESTRICT src, |
| 168 | int count, U8CPU alpha, int x, int y) { |
| 169 | SkASSERT(255 > alpha); |
| 170 | |
| 171 | if (count > 0) { |
| 172 | int src_scale = SkAlpha255To256(alpha) >> 4; |
| 173 | DITHER_4444_SCAN(y); |
| 174 | do { |
| 175 | SkPMColor c = *src++; |
| 176 | SkPMColorAssert(c); |
| 177 | if (c) { |
| 178 | unsigned a = SkAlpha255To256(SkGetPackedA32(c)); |
| 179 | int d = SkAlphaMul(DITHER_VALUE(x), a); |
| 180 | |
| 181 | unsigned dst_scale = 16 - SkAlphaMul(src_scale, a); |
| 182 | uint32_t src_expand = SkExpand32_4444(c) * src_scale; |
| 183 | uint32_t dst_expand = SkExpand_4444(*dst) * dst_scale; |
| 184 | // convert back to SkPMColor |
| 185 | c = SkCompact_8888(src_expand + dst_expand); |
| 186 | *dst = SkDitherARGB32To4444(c, d); |
| 187 | } |
| 188 | dst += 1; |
| 189 | DITHER_INC_X(x); |
| 190 | } while (--count != 0); |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | /////////////////////////////////////////////////////////////////////////////// |
| 195 | /////////////////////////////////////////////////////////////////////////////// |
| 196 | |
| 197 | static const SkBlitRow::Proc gProcs4444[] = { |
| 198 | // no dither |
| 199 | S32_D4444_Opaque, |
| 200 | S32_D4444_Blend, |
| 201 | |
| 202 | S32A_D4444_Opaque, |
| 203 | S32A_D4444_Blend, |
| 204 | |
| 205 | // dither |
| 206 | S32_D4444_Opaque_Dither, |
| 207 | S32_D4444_Blend_Dither, |
| 208 | |
| 209 | S32A_D4444_Opaque_Dither, |
| 210 | S32A_D4444_Blend_Dither |
| 211 | }; |
| 212 | |
| 213 | SkBlitRow::Proc SkBlitRow_Factory_4444(unsigned flags); |
| 214 | SkBlitRow::Proc SkBlitRow_Factory_4444(unsigned flags) |
| 215 | { |
| 216 | SkASSERT(flags < SK_ARRAY_COUNT(gProcs4444)); |
| 217 | |
| 218 | return gProcs4444[flags]; |
| 219 | } |
| 220 | |
| 221 | |