msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015 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 | #ifndef SkCodecPriv_DEFINED |
| 9 | #define SkCodecPriv_DEFINED |
| 10 | |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 11 | #include "SkColorPriv.h" |
msarett | f7eb6fc | 2016-09-13 09:04:11 -0700 | [diff] [blame] | 12 | #include "SkColorSpaceXform.h" |
Matt Sarett | 909d379 | 2016-12-22 10:52:25 -0500 | [diff] [blame] | 13 | #include "SkColorSpaceXformPriv.h" |
msarett | 9e43cab | 2015-04-29 07:38:43 -0700 | [diff] [blame] | 14 | #include "SkColorTable.h" |
Matt Sarett | 1a85ca5 | 2016-11-04 11:52:48 -0400 | [diff] [blame] | 15 | #include "SkEncodedInfo.h" |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 16 | #include "SkImageInfo.h" |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 17 | #include "SkTypes.h" |
| 18 | |
scroggo | c5560be | 2016-02-03 09:42:42 -0800 | [diff] [blame] | 19 | #ifdef SK_PRINT_CODEC_MESSAGES |
| 20 | #define SkCodecPrintf SkDebugf |
| 21 | #else |
| 22 | #define SkCodecPrintf(...) |
| 23 | #endif |
| 24 | |
msarett | 3d9d7a7 | 2015-10-21 10:27:10 -0700 | [diff] [blame] | 25 | // FIXME: Consider sharing with dm, nanbench, and tools. |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 26 | static inline float get_scale_from_sample_size(int sampleSize) { |
msarett | 3d9d7a7 | 2015-10-21 10:27:10 -0700 | [diff] [blame] | 27 | return 1.0f / ((float) sampleSize); |
| 28 | } |
| 29 | |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 30 | static inline bool is_valid_subset(const SkIRect& subset, const SkISize& imageDims) { |
msarett | 3d9d7a7 | 2015-10-21 10:27:10 -0700 | [diff] [blame] | 31 | return SkIRect::MakeSize(imageDims).contains(subset); |
| 32 | } |
| 33 | |
msarett | 5406d6f | 2015-08-31 06:55:13 -0700 | [diff] [blame] | 34 | /* |
msarett | 10522ff | 2015-09-07 08:54:01 -0700 | [diff] [blame] | 35 | * returns a scaled dimension based on the original dimension and the sampleSize |
| 36 | * NOTE: we round down here for scaled dimension to match the behavior of SkImageDecoder |
msarett | 3d9d7a7 | 2015-10-21 10:27:10 -0700 | [diff] [blame] | 37 | * FIXME: I think we should call this get_sampled_dimension(). |
msarett | 10522ff | 2015-09-07 08:54:01 -0700 | [diff] [blame] | 38 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 39 | static inline int get_scaled_dimension(int srcDimension, int sampleSize) { |
msarett | 10522ff | 2015-09-07 08:54:01 -0700 | [diff] [blame] | 40 | if (sampleSize > srcDimension) { |
| 41 | return 1; |
| 42 | } |
| 43 | return srcDimension / sampleSize; |
| 44 | } |
| 45 | |
| 46 | /* |
msarett | 5406d6f | 2015-08-31 06:55:13 -0700 | [diff] [blame] | 47 | * Returns the first coordinate that we will keep during a scaled decode. |
| 48 | * The output can be interpreted as an x-coordinate or a y-coordinate. |
| 49 | * |
| 50 | * This does not need to be called and is not called when sampleFactor == 1. |
| 51 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 52 | static inline int get_start_coord(int sampleFactor) { return sampleFactor / 2; }; |
msarett | 5406d6f | 2015-08-31 06:55:13 -0700 | [diff] [blame] | 53 | |
| 54 | /* |
| 55 | * Given a coordinate in the original image, this returns the corresponding |
| 56 | * coordinate in the scaled image. This function is meaningless if |
| 57 | * IsCoordNecessary returns false. |
| 58 | * The output can be interpreted as an x-coordinate or a y-coordinate. |
| 59 | * |
| 60 | * This does not need to be called and is not called when sampleFactor == 1. |
| 61 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 62 | static inline int get_dst_coord(int srcCoord, int sampleFactor) { return srcCoord / sampleFactor; }; |
msarett | 5406d6f | 2015-08-31 06:55:13 -0700 | [diff] [blame] | 63 | |
| 64 | /* |
| 65 | * When scaling, we will discard certain y-coordinates (rows) and |
| 66 | * x-coordinates (columns). This function returns true if we should keep the |
| 67 | * coordinate and false otherwise. |
| 68 | * The inputs may be x-coordinates or y-coordinates. |
| 69 | * |
| 70 | * This does not need to be called and is not called when sampleFactor == 1. |
| 71 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 72 | static inline bool is_coord_necessary(int srcCoord, int sampleFactor, int scaledDim) { |
msarett | 5406d6f | 2015-08-31 06:55:13 -0700 | [diff] [blame] | 73 | // Get the first coordinate that we want to keep |
| 74 | int startCoord = get_start_coord(sampleFactor); |
| 75 | |
| 76 | // Return false on edge cases |
| 77 | if (srcCoord < startCoord || get_dst_coord(srcCoord, sampleFactor) >= scaledDim) { |
| 78 | return false; |
| 79 | } |
| 80 | |
| 81 | // Every sampleFactor rows are necessary |
| 82 | return ((srcCoord - startCoord) % sampleFactor) == 0; |
| 83 | } |
| 84 | |
Leon Scroggins III | 0741818 | 2017-08-15 12:24:02 -0400 | [diff] [blame^] | 85 | static inline bool valid_alpha(SkAlphaType dstAlpha, bool srcIsOpaque) { |
scroggo | c5560be | 2016-02-03 09:42:42 -0800 | [diff] [blame] | 86 | if (kUnknown_SkAlphaType == dstAlpha) { |
| 87 | return false; |
| 88 | } |
| 89 | |
Leon Scroggins III | 0741818 | 2017-08-15 12:24:02 -0400 | [diff] [blame^] | 90 | if (srcIsOpaque) { |
| 91 | if (kOpaque_SkAlphaType != dstAlpha) { |
scroggo | c5560be | 2016-02-03 09:42:42 -0800 | [diff] [blame] | 92 | SkCodecPrintf("Warning: an opaque image should be decoded as opaque " |
| 93 | "- it is being decoded as non-opaque, which will draw slower\n"); |
msarett | 4ab9d5f | 2015-08-06 15:34:42 -0700 | [diff] [blame] | 94 | } |
Leon Scroggins III | 0741818 | 2017-08-15 12:24:02 -0400 | [diff] [blame^] | 95 | return true; |
msarett | 4ab9d5f | 2015-08-06 15:34:42 -0700 | [diff] [blame] | 96 | } |
Leon Scroggins III | 0741818 | 2017-08-15 12:24:02 -0400 | [diff] [blame^] | 97 | |
| 98 | return dstAlpha != kOpaque_SkAlphaType; |
msarett | 4ab9d5f | 2015-08-06 15:34:42 -0700 | [diff] [blame] | 99 | } |
| 100 | |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 101 | /* |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 102 | * If there is a color table, get a pointer to the colors, otherwise return nullptr |
msarett | 99f567e | 2015-08-05 12:58:26 -0700 | [diff] [blame] | 103 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 104 | static inline const SkPMColor* get_color_ptr(SkColorTable* colorTable) { |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 105 | return nullptr != colorTable ? colorTable->readColors() : nullptr; |
msarett | 99f567e | 2015-08-05 12:58:26 -0700 | [diff] [blame] | 106 | } |
| 107 | |
| 108 | /* |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 109 | * Given that the encoded image uses a color table, return the fill value |
| 110 | */ |
msarett | cf7b877 | 2016-09-22 12:37:04 -0700 | [diff] [blame] | 111 | static inline uint64_t get_color_table_fill_value(SkColorType dstColorType, SkAlphaType alphaType, |
Matt Sarett | 19aff5d | 2017-04-03 16:01:10 -0400 | [diff] [blame] | 112 | const SkPMColor* colorPtr, uint8_t fillIndex, SkColorSpaceXform* colorXform, bool isRGBA) { |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 113 | SkASSERT(nullptr != colorPtr); |
msarett | cf7b877 | 2016-09-22 12:37:04 -0700 | [diff] [blame] | 114 | switch (dstColorType) { |
msarett | 34e0ec4 | 2016-04-22 16:27:24 -0700 | [diff] [blame] | 115 | case kRGBA_8888_SkColorType: |
| 116 | case kBGRA_8888_SkColorType: |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 117 | return colorPtr[fillIndex]; |
| 118 | case kRGB_565_SkColorType: |
| 119 | return SkPixel32ToPixel16(colorPtr[fillIndex]); |
msarett | f7eb6fc | 2016-09-13 09:04:11 -0700 | [diff] [blame] | 120 | case kRGBA_F16_SkColorType: { |
| 121 | SkASSERT(colorXform); |
| 122 | uint64_t dstColor; |
| 123 | uint32_t srcColor = colorPtr[fillIndex]; |
Matt Sarett | 19aff5d | 2017-04-03 16:01:10 -0400 | [diff] [blame] | 124 | SkColorSpaceXform::ColorFormat srcFormat = |
| 125 | isRGBA ? SkColorSpaceXform::kRGBA_8888_ColorFormat |
| 126 | : SkColorSpaceXform::kBGRA_8888_ColorFormat; |
msarett | 31d097e8 | 2016-10-11 12:15:03 -0700 | [diff] [blame] | 127 | SkAssertResult(colorXform->apply(select_xform_format(dstColorType), &dstColor, |
Matt Sarett | 19aff5d | 2017-04-03 16:01:10 -0400 | [diff] [blame] | 128 | srcFormat, &srcColor, 1, alphaType)); |
msarett | f7eb6fc | 2016-09-13 09:04:11 -0700 | [diff] [blame] | 129 | return dstColor; |
| 130 | } |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 131 | default: |
| 132 | SkASSERT(false); |
| 133 | return 0; |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | /* |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 138 | * Compute row bytes for an image using pixels per byte |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 139 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 140 | static inline size_t compute_row_bytes_ppb(int width, uint32_t pixelsPerByte) { |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 141 | return (width + pixelsPerByte - 1) / pixelsPerByte; |
| 142 | } |
| 143 | |
| 144 | /* |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 145 | * Compute row bytes for an image using bytes per pixel |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 146 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 147 | static inline size_t compute_row_bytes_bpp(int width, uint32_t bytesPerPixel) { |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 148 | return width * bytesPerPixel; |
| 149 | } |
| 150 | |
| 151 | /* |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 152 | * Compute row bytes for an image |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 153 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 154 | static inline size_t compute_row_bytes(int width, uint32_t bitsPerPixel) { |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 155 | if (bitsPerPixel < 16) { |
| 156 | SkASSERT(0 == 8 % bitsPerPixel); |
| 157 | const uint32_t pixelsPerByte = 8 / bitsPerPixel; |
| 158 | return compute_row_bytes_ppb(width, pixelsPerByte); |
| 159 | } else { |
| 160 | SkASSERT(0 == bitsPerPixel % 8); |
| 161 | const uint32_t bytesPerPixel = bitsPerPixel / 8; |
| 162 | return compute_row_bytes_bpp(width, bytesPerPixel); |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | /* |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 167 | * Get a byte from a buffer |
| 168 | * This method is unsafe, the caller is responsible for performing a check |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 169 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 170 | static inline uint8_t get_byte(uint8_t* buffer, uint32_t i) { |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 171 | return buffer[i]; |
| 172 | } |
| 173 | |
| 174 | /* |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 175 | * Get a short from a buffer |
| 176 | * This method is unsafe, the caller is responsible for performing a check |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 177 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 178 | static inline uint16_t get_short(uint8_t* buffer, uint32_t i) { |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 179 | uint16_t result; |
| 180 | memcpy(&result, &(buffer[i]), 2); |
| 181 | #ifdef SK_CPU_BENDIAN |
| 182 | return SkEndianSwap16(result); |
| 183 | #else |
| 184 | return result; |
| 185 | #endif |
| 186 | } |
| 187 | |
| 188 | /* |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 189 | * Get an int from a buffer |
| 190 | * This method is unsafe, the caller is responsible for performing a check |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 191 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 192 | static inline uint32_t get_int(uint8_t* buffer, uint32_t i) { |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 193 | uint32_t result; |
| 194 | memcpy(&result, &(buffer[i]), 4); |
| 195 | #ifdef SK_CPU_BENDIAN |
| 196 | return SkEndianSwap32(result); |
| 197 | #else |
| 198 | return result; |
| 199 | #endif |
| 200 | } |
| 201 | |
msarett | 0e6274f | 2016-03-21 08:04:40 -0700 | [diff] [blame] | 202 | /* |
| 203 | * @param data Buffer to read bytes from |
| 204 | * @param isLittleEndian Output parameter |
| 205 | * Indicates if the data is little endian |
| 206 | * Is unaffected on false returns |
| 207 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 208 | static inline bool is_valid_endian_marker(const uint8_t* data, bool* isLittleEndian) { |
msarett | 0e6274f | 2016-03-21 08:04:40 -0700 | [diff] [blame] | 209 | // II indicates Intel (little endian) and MM indicates motorola (big endian). |
| 210 | if (('I' != data[0] || 'I' != data[1]) && ('M' != data[0] || 'M' != data[1])) { |
| 211 | return false; |
| 212 | } |
| 213 | |
| 214 | *isLittleEndian = ('I' == data[0]); |
| 215 | return true; |
| 216 | } |
| 217 | |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 218 | static inline uint16_t get_endian_short(const uint8_t* data, bool littleEndian) { |
msarett | 0e6274f | 2016-03-21 08:04:40 -0700 | [diff] [blame] | 219 | if (littleEndian) { |
| 220 | return (data[1] << 8) | (data[0]); |
| 221 | } |
| 222 | |
| 223 | return (data[0] << 8) | (data[1]); |
| 224 | } |
| 225 | |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 226 | static inline SkPMColor premultiply_argb_as_rgba(U8CPU a, U8CPU r, U8CPU g, U8CPU b) { |
msarett | 34e0ec4 | 2016-04-22 16:27:24 -0700 | [diff] [blame] | 227 | if (a != 255) { |
| 228 | r = SkMulDiv255Round(r, a); |
| 229 | g = SkMulDiv255Round(g, a); |
| 230 | b = SkMulDiv255Round(b, a); |
| 231 | } |
| 232 | |
| 233 | return SkPackARGB_as_RGBA(a, r, g, b); |
| 234 | } |
| 235 | |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 236 | static inline SkPMColor premultiply_argb_as_bgra(U8CPU a, U8CPU r, U8CPU g, U8CPU b) { |
msarett | 34e0ec4 | 2016-04-22 16:27:24 -0700 | [diff] [blame] | 237 | if (a != 255) { |
| 238 | r = SkMulDiv255Round(r, a); |
| 239 | g = SkMulDiv255Round(g, a); |
| 240 | b = SkMulDiv255Round(b, a); |
| 241 | } |
| 242 | |
| 243 | return SkPackARGB_as_BGRA(a, r, g, b); |
| 244 | } |
| 245 | |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 246 | static inline bool is_rgba(SkColorType colorType) { |
msarett | 34e0ec4 | 2016-04-22 16:27:24 -0700 | [diff] [blame] | 247 | #ifdef SK_PMCOLOR_IS_RGBA |
| 248 | return (kBGRA_8888_SkColorType != colorType); |
| 249 | #else |
| 250 | return (kRGBA_8888_SkColorType == colorType); |
| 251 | #endif |
| 252 | } |
| 253 | |
| 254 | // Method for coverting to a 32 bit pixel. |
| 255 | typedef uint32_t (*PackColorProc)(U8CPU a, U8CPU r, U8CPU g, U8CPU b); |
| 256 | |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 257 | static inline PackColorProc choose_pack_color_proc(bool isPremul, SkColorType colorType) { |
msarett | 34e0ec4 | 2016-04-22 16:27:24 -0700 | [diff] [blame] | 258 | bool isRGBA = is_rgba(colorType); |
| 259 | if (isPremul) { |
| 260 | if (isRGBA) { |
| 261 | return &premultiply_argb_as_rgba; |
| 262 | } else { |
| 263 | return &premultiply_argb_as_bgra; |
| 264 | } |
| 265 | } else { |
| 266 | if (isRGBA) { |
| 267 | return &SkPackARGB_as_RGBA; |
| 268 | } else { |
| 269 | return &SkPackARGB_as_BGRA; |
| 270 | } |
| 271 | } |
| 272 | } |
| 273 | |
Matt Sarett | 61eedeb | 2016-11-04 13:19:48 -0400 | [diff] [blame] | 274 | static inline bool needs_premul(const SkImageInfo& dstInfo, const SkEncodedInfo& encodedInfo) { |
msarett | dcd5e65 | 2016-08-22 08:48:40 -0700 | [diff] [blame] | 275 | return kPremul_SkAlphaType == dstInfo.alphaType() && |
Matt Sarett | 61eedeb | 2016-11-04 13:19:48 -0400 | [diff] [blame] | 276 | SkEncodedInfo::kUnpremul_Alpha == encodedInfo.alpha(); |
msarett | dcd5e65 | 2016-08-22 08:48:40 -0700 | [diff] [blame] | 277 | } |
| 278 | |
Leon Scroggins III | 0741818 | 2017-08-15 12:24:02 -0400 | [diff] [blame^] | 279 | static inline bool needs_color_xform(const SkImageInfo& dstInfo, const SkColorSpace* srcCS, |
Matt Sarett | cf3f234 | 2017-03-23 15:32:25 -0400 | [diff] [blame] | 280 | bool needsColorCorrectPremul) { |
Matt Sarett | e522f4c | 2017-02-22 13:02:31 -0500 | [diff] [blame] | 281 | // We never perform a color xform in legacy mode. |
| 282 | if (!dstInfo.colorSpace()) { |
| 283 | return false; |
| 284 | } |
| 285 | |
msarett | dcd5e65 | 2016-08-22 08:48:40 -0700 | [diff] [blame] | 286 | // F16 is by definition a linear space, so we always must perform a color xform. |
| 287 | bool isF16 = kRGBA_F16_SkColorType == dstInfo.colorType(); |
| 288 | |
| 289 | // Need a color xform when dst space does not match the src. |
Leon Scroggins III | 0741818 | 2017-08-15 12:24:02 -0400 | [diff] [blame^] | 290 | bool srcDstNotEqual = !SkColorSpace::Equals(srcCS, dstInfo.colorSpace()); |
msarett | dcd5e65 | 2016-08-22 08:48:40 -0700 | [diff] [blame] | 291 | |
Matt Sarett | e522f4c | 2017-02-22 13:02:31 -0500 | [diff] [blame] | 292 | return needsColorCorrectPremul || isF16 || srcDstNotEqual; |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 293 | } |
| 294 | |
msarett | c044461 | 2016-09-16 11:45:58 -0700 | [diff] [blame] | 295 | static inline SkAlphaType select_xform_alpha(SkAlphaType dstAlphaType, SkAlphaType srcAlphaType) { |
msarett | e99883f | 2016-09-08 06:05:35 -0700 | [diff] [blame] | 296 | return (kOpaque_SkAlphaType == srcAlphaType) ? kOpaque_SkAlphaType : dstAlphaType; |
| 297 | } |
| 298 | |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 299 | #endif // SkCodecPriv_DEFINED |