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" |
| 16 | #include "SkUnPreMultiply.h" |
| 17 | |
| 18 | /** |
| 19 | * Function template for transforming scanlines. |
| 20 | * Transform 'width' pixels from 'src' buffer into 'dst' buffer, |
| 21 | * repacking color channel data as appropriate for the given transformation. |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 22 | * 'bpp' is bytes per pixel in the 'src' buffer. |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 23 | */ |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 24 | typedef void (*transform_scanline_proc)(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
| 25 | int width, int bpp); |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 26 | |
| 27 | /** |
| 28 | * Identity transformation: just copy bytes from src to dst. |
| 29 | */ |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 30 | static void transform_scanline_memcpy(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
| 31 | int width, int bpp) { |
| 32 | memcpy(dst, src, width * bpp); |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 33 | } |
| 34 | |
| 35 | /** |
| 36 | * Transform from kRGB_565_Config to 3-bytes-per-pixel RGB. |
| 37 | * Alpha channel data is not present in kRGB_565_Config format, so there is no |
| 38 | * alpha channel data to preserve. |
| 39 | */ |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 40 | static void transform_scanline_565(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
| 41 | int width, int) { |
| 42 | const uint16_t* srcP = (const uint16_t*)src; |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 43 | for (int i = 0; i < width; i++) { |
| 44 | unsigned c = *srcP++; |
| 45 | *dst++ = SkPacked16ToR32(c); |
| 46 | *dst++ = SkPacked16ToG32(c); |
| 47 | *dst++ = SkPacked16ToB32(c); |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | /** |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 52 | * Transform from kRGBA_8888_SkColorType to 3-bytes-per-pixel RGB. |
| 53 | * Alpha channel data is abandoned. |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 54 | */ |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 55 | static void transform_scanline_RGBX(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
| 56 | int width, int) { |
| 57 | const uint32_t* srcP = (const SkPMColor*)src; |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 58 | for (int i = 0; i < width; i++) { |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 59 | uint32_t c = *srcP++; |
| 60 | *dst++ = (c >> 0) & 0xFF; |
| 61 | *dst++ = (c >> 8) & 0xFF; |
| 62 | *dst++ = (c >> 16) & 0xFF; |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * Transform from kBGRA_8888_SkColorType to 3-bytes-per-pixel RGB. |
| 68 | * Alpha channel data is abandoned. |
| 69 | */ |
| 70 | static void transform_scanline_BGRX(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
| 71 | int width, int) { |
| 72 | const uint32_t* srcP = (const SkPMColor*)src; |
| 73 | for (int i = 0; i < width; i++) { |
| 74 | uint32_t c = *srcP++; |
| 75 | *dst++ = (c >> 16) & 0xFF; |
| 76 | *dst++ = (c >> 8) & 0xFF; |
| 77 | *dst++ = (c >> 0) & 0xFF; |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 78 | } |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Transform from kARGB_4444_Config to 3-bytes-per-pixel RGB. |
| 83 | * Alpha channel data, if any, is abandoned. |
| 84 | */ |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 85 | static void transform_scanline_444(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
| 86 | int width, int) { |
| 87 | const SkPMColor16* srcP = (const SkPMColor16*)src; |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 88 | for (int i = 0; i < width; i++) { |
| 89 | SkPMColor16 c = *srcP++; |
| 90 | *dst++ = SkPacked4444ToR32(c); |
| 91 | *dst++ = SkPacked4444ToG32(c); |
| 92 | *dst++ = SkPacked4444ToB32(c); |
| 93 | } |
| 94 | } |
| 95 | |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 96 | template <bool kIsRGBA> |
| 97 | static inline void transform_scanline_unpremultiply(char* SK_RESTRICT dst, |
| 98 | const char* SK_RESTRICT src, int width, int) { |
| 99 | const uint32_t* srcP = (const SkPMColor*)src; |
| 100 | const SkUnPreMultiply::Scale* table = SkUnPreMultiply::GetScaleTable(); |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 101 | |
| 102 | for (int i = 0; i < width; i++) { |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 103 | uint32_t c = *srcP++; |
| 104 | unsigned r, g, b, a; |
| 105 | if (kIsRGBA) { |
| 106 | r = (c >> 0) & 0xFF; |
| 107 | g = (c >> 8) & 0xFF; |
| 108 | b = (c >> 16) & 0xFF; |
| 109 | a = (c >> 24) & 0xFF; |
| 110 | } else { |
| 111 | r = (c >> 16) & 0xFF; |
| 112 | g = (c >> 8) & 0xFF; |
| 113 | b = (c >> 0) & 0xFF; |
| 114 | a = (c >> 24) & 0xFF; |
| 115 | } |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 116 | |
| 117 | if (0 != a && 255 != a) { |
| 118 | SkUnPreMultiply::Scale scale = table[a]; |
| 119 | r = SkUnPreMultiply::ApplyScale(scale, r); |
| 120 | g = SkUnPreMultiply::ApplyScale(scale, g); |
| 121 | b = SkUnPreMultiply::ApplyScale(scale, b); |
| 122 | } |
| 123 | *dst++ = r; |
| 124 | *dst++ = g; |
| 125 | *dst++ = b; |
| 126 | *dst++ = a; |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | /** |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 131 | * Transform from kPremul, kRGBA_8888_SkColorType to 4-bytes-per-pixel unpremultiplied RGBA. |
| 132 | */ |
| 133 | static void transform_scanline_rgbA(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
| 134 | int width, int bpp) { |
| 135 | transform_scanline_unpremultiply<true>(dst, src, width, bpp); |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * Transform from kPremul, kBGRA_8888_SkColorType to 4-bytes-per-pixel unpremultiplied RGBA. |
| 140 | */ |
| 141 | static void transform_scanline_bgrA(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
| 142 | int width, int bpp) { |
| 143 | transform_scanline_unpremultiply<false>(dst, src, width, bpp); |
| 144 | } |
| 145 | |
| 146 | /** |
| 147 | * Transform from kUnpremul, kBGRA_8888_SkColorType to 4-bytes-per-pixel unpremultiplied RGBA. |
| 148 | */ |
| 149 | static void transform_scanline_BGRA(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
| 150 | int width, int) { |
| 151 | const uint32_t* srcP = (const SkPMColor*)src; |
| 152 | for (int i = 0; i < width; i++) { |
| 153 | uint32_t c = *srcP++; |
| 154 | *dst++ = (c >> 16) & 0xFF; |
| 155 | *dst++ = (c >> 8) & 0xFF; |
| 156 | *dst++ = (c >> 0) & 0xFF; |
| 157 | *dst++ = (c >> 24) & 0xFF; |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | /** |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 162 | * Transform from kARGB_8888_Config to 4-bytes-per-pixel RGBA, |
| 163 | * with scaling of RGB based on alpha channel. |
| 164 | */ |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 165 | static void transform_scanline_4444(char* SK_RESTRICT dst, const char* SK_RESTRICT src, |
| 166 | int width, int) { |
| 167 | const SkPMColor16* srcP = (const SkPMColor16*)src; |
| 168 | const SkUnPreMultiply::Scale* table = SkUnPreMultiply::GetScaleTable(); |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 169 | |
| 170 | for (int i = 0; i < width; i++) { |
| 171 | SkPMColor16 c = *srcP++; |
| 172 | unsigned a = SkPacked4444ToA32(c); |
| 173 | unsigned r = SkPacked4444ToR32(c); |
| 174 | unsigned g = SkPacked4444ToG32(c); |
| 175 | unsigned b = SkPacked4444ToB32(c); |
| 176 | |
| 177 | if (0 != a && 255 != a) { |
| 178 | SkUnPreMultiply::Scale scale = table[a]; |
| 179 | r = SkUnPreMultiply::ApplyScale(scale, r); |
| 180 | g = SkUnPreMultiply::ApplyScale(scale, g); |
| 181 | b = SkUnPreMultiply::ApplyScale(scale, b); |
| 182 | } |
| 183 | *dst++ = r; |
| 184 | *dst++ = g; |
| 185 | *dst++ = b; |
| 186 | *dst++ = a; |
| 187 | } |
| 188 | } |