epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2012 The Android Open Source Project |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
| 8 | /** |
| 9 | * Functions to transform scanlines between packed-pixel formats. |
| 10 | */ |
| 11 | |
| 12 | #include "SkBitmap.h" |
| 13 | #include "SkColor.h" |
| 14 | #include "SkColorPriv.h" |
| 15 | #include "SkPreConfig.h" |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 16 | #include "SkRasterPipeline.h" |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 17 | #include "SkUnPreMultiply.h" |
| 18 | |
| 19 | /** |
| 20 | * Function template for transforming scanlines. |
| 21 | * Transform 'width' pixels from 'src' buffer into 'dst' buffer, |
| 22 | * repacking color channel data as appropriate for the given transformation. |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 23 | * 'bpp' is bytes per pixel in the 'src' buffer. |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 24 | */ |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 25 | typedef void (*transform_scanline_proc)(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
| 26 | int width, int bpp); |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 27 | |
| 28 | /** |
| 29 | * Identity transformation: just copy bytes from src to dst. |
| 30 | */ |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 31 | static void transform_scanline_memcpy(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
| 32 | int width, int bpp) { |
| 33 | memcpy(dst, src, width * bpp); |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 34 | } |
| 35 | |
| 36 | /** |
| 37 | * Transform from kRGB_565_Config to 3-bytes-per-pixel RGB. |
| 38 | * Alpha channel data is not present in kRGB_565_Config format, so there is no |
| 39 | * alpha channel data to preserve. |
| 40 | */ |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 41 | static void transform_scanline_565(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
| 42 | int width, int) { |
| 43 | const uint16_t* srcP = (const uint16_t*)src; |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 44 | for (int i = 0; i < width; i++) { |
| 45 | unsigned c = *srcP++; |
| 46 | *dst++ = SkPacked16ToR32(c); |
| 47 | *dst++ = SkPacked16ToG32(c); |
| 48 | *dst++ = SkPacked16ToB32(c); |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | /** |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 53 | * Transform from kRGBA_8888_SkColorType to 3-bytes-per-pixel RGB. |
| 54 | * Alpha channel data is abandoned. |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 55 | */ |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 56 | static void transform_scanline_RGBX(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
| 57 | int width, int) { |
| 58 | const uint32_t* srcP = (const SkPMColor*)src; |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 59 | for (int i = 0; i < width; i++) { |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 60 | uint32_t c = *srcP++; |
| 61 | *dst++ = (c >> 0) & 0xFF; |
| 62 | *dst++ = (c >> 8) & 0xFF; |
| 63 | *dst++ = (c >> 16) & 0xFF; |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * Transform from kBGRA_8888_SkColorType to 3-bytes-per-pixel RGB. |
| 69 | * Alpha channel data is abandoned. |
| 70 | */ |
| 71 | static void transform_scanline_BGRX(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
| 72 | int width, int) { |
| 73 | const uint32_t* srcP = (const SkPMColor*)src; |
| 74 | for (int i = 0; i < width; i++) { |
| 75 | uint32_t c = *srcP++; |
| 76 | *dst++ = (c >> 16) & 0xFF; |
| 77 | *dst++ = (c >> 8) & 0xFF; |
| 78 | *dst++ = (c >> 0) & 0xFF; |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 79 | } |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * Transform from kARGB_4444_Config to 3-bytes-per-pixel RGB. |
| 84 | * Alpha channel data, if any, is abandoned. |
| 85 | */ |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 86 | static void transform_scanline_444(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
| 87 | int width, int) { |
| 88 | const SkPMColor16* srcP = (const SkPMColor16*)src; |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 89 | for (int i = 0; i < width; i++) { |
| 90 | SkPMColor16 c = *srcP++; |
| 91 | *dst++ = SkPacked4444ToR32(c); |
| 92 | *dst++ = SkPacked4444ToG32(c); |
| 93 | *dst++ = SkPacked4444ToB32(c); |
| 94 | } |
| 95 | } |
| 96 | |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 97 | template <bool kIsRGBA> |
| 98 | static inline void transform_scanline_unpremultiply(char* SK_RESTRICT dst, |
Matt Sarett | 1da27ef | 2017-01-19 17:14:07 -0500 | [diff] [blame^] | 99 | const char* SK_RESTRICT src, int width) { |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 100 | const uint32_t* srcP = (const SkPMColor*)src; |
| 101 | const SkUnPreMultiply::Scale* table = SkUnPreMultiply::GetScaleTable(); |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 102 | |
| 103 | for (int i = 0; i < width; i++) { |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 104 | uint32_t c = *srcP++; |
| 105 | unsigned r, g, b, a; |
| 106 | if (kIsRGBA) { |
| 107 | r = (c >> 0) & 0xFF; |
| 108 | g = (c >> 8) & 0xFF; |
| 109 | b = (c >> 16) & 0xFF; |
| 110 | a = (c >> 24) & 0xFF; |
| 111 | } else { |
| 112 | r = (c >> 16) & 0xFF; |
| 113 | g = (c >> 8) & 0xFF; |
| 114 | b = (c >> 0) & 0xFF; |
| 115 | a = (c >> 24) & 0xFF; |
| 116 | } |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 117 | |
| 118 | if (0 != a && 255 != a) { |
| 119 | SkUnPreMultiply::Scale scale = table[a]; |
| 120 | r = SkUnPreMultiply::ApplyScale(scale, r); |
| 121 | g = SkUnPreMultiply::ApplyScale(scale, g); |
| 122 | b = SkUnPreMultiply::ApplyScale(scale, b); |
| 123 | } |
| 124 | *dst++ = r; |
| 125 | *dst++ = g; |
| 126 | *dst++ = b; |
| 127 | *dst++ = a; |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | /** |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 132 | * Transform from legacy kPremul, kRGBA_8888_SkColorType to 4-bytes-per-pixel unpremultiplied RGBA. |
| 133 | */ |
| 134 | static void transform_scanline_rgbA(char* SK_RESTRICT dst, const char* SK_RESTRICT src, int width, |
Matt Sarett | 1da27ef | 2017-01-19 17:14:07 -0500 | [diff] [blame^] | 135 | int) { |
| 136 | transform_scanline_unpremultiply<true>(dst, src, width); |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 137 | } |
| 138 | |
| 139 | /** |
| 140 | * Transform from legacy kPremul, kBGRA_8888_SkColorType to 4-bytes-per-pixel unpremultiplied RGBA. |
| 141 | */ |
| 142 | static void transform_scanline_bgrA(char* SK_RESTRICT dst, const char* SK_RESTRICT src, int width, |
Matt Sarett | 1da27ef | 2017-01-19 17:14:07 -0500 | [diff] [blame^] | 143 | int) { |
| 144 | transform_scanline_unpremultiply<false>(dst, src, width); |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 145 | } |
| 146 | |
| 147 | template <bool kIsRGBA> |
Matt Sarett | 1da27ef | 2017-01-19 17:14:07 -0500 | [diff] [blame^] | 148 | static inline void transform_scanline_unpremultiply_sRGB(void* dst, const void* src, int width) { |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 149 | SkRasterPipeline p; |
| 150 | p.append(SkRasterPipeline::load_8888, &src); |
| 151 | if (!kIsRGBA) { |
| 152 | p.append(SkRasterPipeline::swap_rb); |
| 153 | } |
| 154 | |
| 155 | p.append_from_srgb(kPremul_SkAlphaType); |
| 156 | p.append(SkRasterPipeline::unpremul); |
| 157 | p.append(SkRasterPipeline::to_srgb); |
| 158 | p.append(SkRasterPipeline::store_8888, &dst); |
| 159 | p.run(0, 0, width); |
| 160 | } |
| 161 | |
| 162 | /** |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 163 | * Transform from kPremul, kRGBA_8888_SkColorType to 4-bytes-per-pixel unpremultiplied RGBA. |
| 164 | */ |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 165 | static void transform_scanline_srgbA(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
Matt Sarett | 1da27ef | 2017-01-19 17:14:07 -0500 | [diff] [blame^] | 166 | int width, int) { |
| 167 | transform_scanline_unpremultiply_sRGB<true>(dst, src, width); |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 168 | } |
| 169 | |
| 170 | /** |
| 171 | * Transform from kPremul, kBGRA_8888_SkColorType to 4-bytes-per-pixel unpremultiplied RGBA. |
| 172 | */ |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 173 | static void transform_scanline_sbgrA(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
Matt Sarett | 1da27ef | 2017-01-19 17:14:07 -0500 | [diff] [blame^] | 174 | int width, int) { |
| 175 | transform_scanline_unpremultiply_sRGB<false>(dst, src, width); |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 176 | } |
| 177 | |
| 178 | /** |
| 179 | * Transform from kUnpremul, kBGRA_8888_SkColorType to 4-bytes-per-pixel unpremultiplied RGBA. |
| 180 | */ |
| 181 | static void transform_scanline_BGRA(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
| 182 | int width, int) { |
| 183 | const uint32_t* srcP = (const SkPMColor*)src; |
| 184 | for (int i = 0; i < width; i++) { |
| 185 | uint32_t c = *srcP++; |
| 186 | *dst++ = (c >> 16) & 0xFF; |
| 187 | *dst++ = (c >> 8) & 0xFF; |
| 188 | *dst++ = (c >> 0) & 0xFF; |
| 189 | *dst++ = (c >> 24) & 0xFF; |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | /** |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 194 | * Transform from kARGB_8888_Config to 4-bytes-per-pixel RGBA, |
| 195 | * with scaling of RGB based on alpha channel. |
| 196 | */ |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 197 | static void transform_scanline_4444(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
| 198 | int width, int) { |
| 199 | const SkPMColor16* srcP = (const SkPMColor16*)src; |
| 200 | const SkUnPreMultiply::Scale* table = SkUnPreMultiply::GetScaleTable(); |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 201 | |
| 202 | for (int i = 0; i < width; i++) { |
| 203 | SkPMColor16 c = *srcP++; |
| 204 | unsigned a = SkPacked4444ToA32(c); |
| 205 | unsigned r = SkPacked4444ToR32(c); |
| 206 | unsigned g = SkPacked4444ToG32(c); |
| 207 | unsigned b = SkPacked4444ToB32(c); |
| 208 | |
| 209 | if (0 != a && 255 != a) { |
| 210 | SkUnPreMultiply::Scale scale = table[a]; |
| 211 | r = SkUnPreMultiply::ApplyScale(scale, r); |
| 212 | g = SkUnPreMultiply::ApplyScale(scale, g); |
| 213 | b = SkUnPreMultiply::ApplyScale(scale, b); |
| 214 | } |
| 215 | *dst++ = r; |
| 216 | *dst++ = g; |
| 217 | *dst++ = b; |
| 218 | *dst++ = a; |
| 219 | } |
| 220 | } |
Matt Sarett | 1da27ef | 2017-01-19 17:14:07 -0500 | [diff] [blame^] | 221 | |
| 222 | /** |
| 223 | * Transform from kRGBA_F16 to 4-bytes-per-pixel RGBA. |
| 224 | */ |
| 225 | static void transform_scanline_F16(char* SK_RESTRICT dst, const char* SK_RESTRICT src, int width, |
| 226 | int) { |
| 227 | SkRasterPipeline p; |
| 228 | p.append(SkRasterPipeline::load_f16, (const void**) &src); |
| 229 | p.append(SkRasterPipeline::to_srgb); |
| 230 | p.append(SkRasterPipeline::store_u16_be, (void**) &dst); |
| 231 | p.run(0, 0, width); |
| 232 | } |
| 233 | |
| 234 | /** |
| 235 | * Transform from kPremul, kRGBA_F16 to 4-bytes-per-pixel RGBA. |
| 236 | */ |
| 237 | static void transform_scanline_F16_premul(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
| 238 | int width, int) { |
| 239 | SkRasterPipeline p; |
| 240 | p.append(SkRasterPipeline::load_f16, (const void**) &src); |
| 241 | p.append(SkRasterPipeline::unpremul); |
| 242 | p.append(SkRasterPipeline::to_srgb); |
| 243 | p.append(SkRasterPipeline::store_u16_be, (void**) &dst); |
| 244 | p.run(0, 0, width); |
| 245 | } |