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 | |
Cary Clark | a4083c9 | 2017-09-15 11:59:23 -0400 | [diff] [blame] | 11 | #include "SkColorData.h" |
msarett | 9e43cab | 2015-04-29 07:38:43 -0700 | [diff] [blame] | 12 | #include "SkColorTable.h" |
Matt Sarett | 1a85ca5 | 2016-11-04 11:52:48 -0400 | [diff] [blame] | 13 | #include "SkEncodedInfo.h" |
Leon Scroggins III | da3e9ad | 2018-01-26 15:48:26 -0500 | [diff] [blame] | 14 | #include "SkEncodedOrigin.h" |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 15 | #include "SkImageInfo.h" |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 16 | #include "SkTypes.h" |
| 17 | |
Leon Scroggins III | 2cc7d13 | 2018-01-19 12:12:13 -0500 | [diff] [blame] | 18 | #ifdef SK_PRINT_CODEC_MESSAGES |
scroggo | c5560be | 2016-02-03 09:42:42 -0800 | [diff] [blame] | 19 | #define SkCodecPrintf SkDebugf |
| 20 | #else |
| 21 | #define SkCodecPrintf(...) |
| 22 | #endif |
| 23 | |
Leon Scroggins III | 179559f | 2018-12-10 12:30:12 -0500 | [diff] [blame] | 24 | // Defined in SkCodec.cpp |
| 25 | bool sk_select_xform_format(SkColorType colorType, bool forColorTable, |
| 26 | skcms_PixelFormat* outFormat); |
| 27 | |
msarett | 3d9d7a7 | 2015-10-21 10:27:10 -0700 | [diff] [blame] | 28 | // FIXME: Consider sharing with dm, nanbench, and tools. |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 29 | static inline float get_scale_from_sample_size(int sampleSize) { |
msarett | 3d9d7a7 | 2015-10-21 10:27:10 -0700 | [diff] [blame] | 30 | return 1.0f / ((float) sampleSize); |
| 31 | } |
| 32 | |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 33 | static inline bool is_valid_subset(const SkIRect& subset, const SkISize& imageDims) { |
msarett | 3d9d7a7 | 2015-10-21 10:27:10 -0700 | [diff] [blame] | 34 | return SkIRect::MakeSize(imageDims).contains(subset); |
| 35 | } |
| 36 | |
msarett | 5406d6f | 2015-08-31 06:55:13 -0700 | [diff] [blame] | 37 | /* |
msarett | 10522ff | 2015-09-07 08:54:01 -0700 | [diff] [blame] | 38 | * returns a scaled dimension based on the original dimension and the sampleSize |
| 39 | * 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] | 40 | * FIXME: I think we should call this get_sampled_dimension(). |
msarett | 10522ff | 2015-09-07 08:54:01 -0700 | [diff] [blame] | 41 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 42 | static inline int get_scaled_dimension(int srcDimension, int sampleSize) { |
msarett | 10522ff | 2015-09-07 08:54:01 -0700 | [diff] [blame] | 43 | if (sampleSize > srcDimension) { |
| 44 | return 1; |
| 45 | } |
| 46 | return srcDimension / sampleSize; |
| 47 | } |
| 48 | |
| 49 | /* |
msarett | 5406d6f | 2015-08-31 06:55:13 -0700 | [diff] [blame] | 50 | * Returns the first coordinate that we will keep during a scaled decode. |
| 51 | * The output can be interpreted as an x-coordinate or a y-coordinate. |
| 52 | * |
| 53 | * This does not need to be called and is not called when sampleFactor == 1. |
| 54 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 55 | static inline int get_start_coord(int sampleFactor) { return sampleFactor / 2; }; |
msarett | 5406d6f | 2015-08-31 06:55:13 -0700 | [diff] [blame] | 56 | |
| 57 | /* |
| 58 | * Given a coordinate in the original image, this returns the corresponding |
| 59 | * coordinate in the scaled image. This function is meaningless if |
| 60 | * IsCoordNecessary returns false. |
| 61 | * The output can be interpreted as an x-coordinate or a y-coordinate. |
| 62 | * |
| 63 | * This does not need to be called and is not called when sampleFactor == 1. |
| 64 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 65 | static inline int get_dst_coord(int srcCoord, int sampleFactor) { return srcCoord / sampleFactor; }; |
msarett | 5406d6f | 2015-08-31 06:55:13 -0700 | [diff] [blame] | 66 | |
| 67 | /* |
| 68 | * When scaling, we will discard certain y-coordinates (rows) and |
| 69 | * x-coordinates (columns). This function returns true if we should keep the |
| 70 | * coordinate and false otherwise. |
| 71 | * The inputs may be x-coordinates or y-coordinates. |
| 72 | * |
| 73 | * This does not need to be called and is not called when sampleFactor == 1. |
| 74 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 75 | static inline bool is_coord_necessary(int srcCoord, int sampleFactor, int scaledDim) { |
msarett | 5406d6f | 2015-08-31 06:55:13 -0700 | [diff] [blame] | 76 | // Get the first coordinate that we want to keep |
| 77 | int startCoord = get_start_coord(sampleFactor); |
| 78 | |
| 79 | // Return false on edge cases |
| 80 | if (srcCoord < startCoord || get_dst_coord(srcCoord, sampleFactor) >= scaledDim) { |
| 81 | return false; |
| 82 | } |
| 83 | |
| 84 | // Every sampleFactor rows are necessary |
| 85 | return ((srcCoord - startCoord) % sampleFactor) == 0; |
| 86 | } |
| 87 | |
Leon Scroggins III | 0741818 | 2017-08-15 12:24:02 -0400 | [diff] [blame] | 88 | static inline bool valid_alpha(SkAlphaType dstAlpha, bool srcIsOpaque) { |
scroggo | c5560be | 2016-02-03 09:42:42 -0800 | [diff] [blame] | 89 | if (kUnknown_SkAlphaType == dstAlpha) { |
| 90 | return false; |
| 91 | } |
| 92 | |
Leon Scroggins III | 0741818 | 2017-08-15 12:24:02 -0400 | [diff] [blame] | 93 | if (srcIsOpaque) { |
| 94 | if (kOpaque_SkAlphaType != dstAlpha) { |
scroggo | c5560be | 2016-02-03 09:42:42 -0800 | [diff] [blame] | 95 | SkCodecPrintf("Warning: an opaque image should be decoded as opaque " |
| 96 | "- it is being decoded as non-opaque, which will draw slower\n"); |
msarett | 4ab9d5f | 2015-08-06 15:34:42 -0700 | [diff] [blame] | 97 | } |
Leon Scroggins III | 0741818 | 2017-08-15 12:24:02 -0400 | [diff] [blame] | 98 | return true; |
msarett | 4ab9d5f | 2015-08-06 15:34:42 -0700 | [diff] [blame] | 99 | } |
Leon Scroggins III | 0741818 | 2017-08-15 12:24:02 -0400 | [diff] [blame] | 100 | |
| 101 | return dstAlpha != kOpaque_SkAlphaType; |
msarett | 4ab9d5f | 2015-08-06 15:34:42 -0700 | [diff] [blame] | 102 | } |
| 103 | |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 104 | /* |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 105 | * 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] | 106 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 107 | static inline const SkPMColor* get_color_ptr(SkColorTable* colorTable) { |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 108 | return nullptr != colorTable ? colorTable->readColors() : nullptr; |
msarett | 99f567e | 2015-08-05 12:58:26 -0700 | [diff] [blame] | 109 | } |
| 110 | |
| 111 | /* |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 112 | * Compute row bytes for an image using pixels per byte |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 113 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 114 | static inline size_t compute_row_bytes_ppb(int width, uint32_t pixelsPerByte) { |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 115 | return (width + pixelsPerByte - 1) / pixelsPerByte; |
| 116 | } |
| 117 | |
| 118 | /* |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 119 | * Compute row bytes for an image using bytes per pixel |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 120 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 121 | static inline size_t compute_row_bytes_bpp(int width, uint32_t bytesPerPixel) { |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 122 | return width * bytesPerPixel; |
| 123 | } |
| 124 | |
| 125 | /* |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 126 | * Compute row bytes for an image |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 127 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 128 | static inline size_t compute_row_bytes(int width, uint32_t bitsPerPixel) { |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 129 | if (bitsPerPixel < 16) { |
| 130 | SkASSERT(0 == 8 % bitsPerPixel); |
| 131 | const uint32_t pixelsPerByte = 8 / bitsPerPixel; |
| 132 | return compute_row_bytes_ppb(width, pixelsPerByte); |
| 133 | } else { |
| 134 | SkASSERT(0 == bitsPerPixel % 8); |
| 135 | const uint32_t bytesPerPixel = bitsPerPixel / 8; |
| 136 | return compute_row_bytes_bpp(width, bytesPerPixel); |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | /* |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 141 | * Get a byte from a buffer |
| 142 | * This method is unsafe, the caller is responsible for performing a check |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 143 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 144 | static inline uint8_t get_byte(uint8_t* buffer, uint32_t i) { |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 145 | return buffer[i]; |
| 146 | } |
| 147 | |
| 148 | /* |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 149 | * Get a short from a buffer |
| 150 | * This method is unsafe, the caller is responsible for performing a check |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 151 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 152 | static inline uint16_t get_short(uint8_t* buffer, uint32_t i) { |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 153 | uint16_t result; |
| 154 | memcpy(&result, &(buffer[i]), 2); |
| 155 | #ifdef SK_CPU_BENDIAN |
| 156 | return SkEndianSwap16(result); |
| 157 | #else |
| 158 | return result; |
| 159 | #endif |
| 160 | } |
| 161 | |
| 162 | /* |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 163 | * Get an int from a buffer |
| 164 | * This method is unsafe, the caller is responsible for performing a check |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 165 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 166 | static inline uint32_t get_int(uint8_t* buffer, uint32_t i) { |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 167 | uint32_t result; |
| 168 | memcpy(&result, &(buffer[i]), 4); |
| 169 | #ifdef SK_CPU_BENDIAN |
| 170 | return SkEndianSwap32(result); |
| 171 | #else |
| 172 | return result; |
| 173 | #endif |
| 174 | } |
| 175 | |
msarett | 0e6274f | 2016-03-21 08:04:40 -0700 | [diff] [blame] | 176 | /* |
| 177 | * @param data Buffer to read bytes from |
| 178 | * @param isLittleEndian Output parameter |
| 179 | * Indicates if the data is little endian |
| 180 | * Is unaffected on false returns |
| 181 | */ |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 182 | static inline bool is_valid_endian_marker(const uint8_t* data, bool* isLittleEndian) { |
msarett | 0e6274f | 2016-03-21 08:04:40 -0700 | [diff] [blame] | 183 | // II indicates Intel (little endian) and MM indicates motorola (big endian). |
| 184 | if (('I' != data[0] || 'I' != data[1]) && ('M' != data[0] || 'M' != data[1])) { |
| 185 | return false; |
| 186 | } |
| 187 | |
| 188 | *isLittleEndian = ('I' == data[0]); |
| 189 | return true; |
| 190 | } |
| 191 | |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 192 | static inline uint16_t get_endian_short(const uint8_t* data, bool littleEndian) { |
msarett | 0e6274f | 2016-03-21 08:04:40 -0700 | [diff] [blame] | 193 | if (littleEndian) { |
| 194 | return (data[1] << 8) | (data[0]); |
| 195 | } |
| 196 | |
| 197 | return (data[0] << 8) | (data[1]); |
| 198 | } |
| 199 | |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 200 | 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] | 201 | if (a != 255) { |
| 202 | r = SkMulDiv255Round(r, a); |
| 203 | g = SkMulDiv255Round(g, a); |
| 204 | b = SkMulDiv255Round(b, a); |
| 205 | } |
| 206 | |
| 207 | return SkPackARGB_as_RGBA(a, r, g, b); |
| 208 | } |
| 209 | |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 210 | 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] | 211 | if (a != 255) { |
| 212 | r = SkMulDiv255Round(r, a); |
| 213 | g = SkMulDiv255Round(g, a); |
| 214 | b = SkMulDiv255Round(b, a); |
| 215 | } |
| 216 | |
| 217 | return SkPackARGB_as_BGRA(a, r, g, b); |
| 218 | } |
| 219 | |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 220 | static inline bool is_rgba(SkColorType colorType) { |
msarett | 34e0ec4 | 2016-04-22 16:27:24 -0700 | [diff] [blame] | 221 | #ifdef SK_PMCOLOR_IS_RGBA |
| 222 | return (kBGRA_8888_SkColorType != colorType); |
| 223 | #else |
| 224 | return (kRGBA_8888_SkColorType == colorType); |
| 225 | #endif |
| 226 | } |
| 227 | |
| 228 | // Method for coverting to a 32 bit pixel. |
| 229 | typedef uint32_t (*PackColorProc)(U8CPU a, U8CPU r, U8CPU g, U8CPU b); |
| 230 | |
msarett | d1ec89b | 2016-08-03 12:59:27 -0700 | [diff] [blame] | 231 | static inline PackColorProc choose_pack_color_proc(bool isPremul, SkColorType colorType) { |
msarett | 34e0ec4 | 2016-04-22 16:27:24 -0700 | [diff] [blame] | 232 | bool isRGBA = is_rgba(colorType); |
| 233 | if (isPremul) { |
| 234 | if (isRGBA) { |
| 235 | return &premultiply_argb_as_rgba; |
| 236 | } else { |
| 237 | return &premultiply_argb_as_bgra; |
| 238 | } |
| 239 | } else { |
| 240 | if (isRGBA) { |
| 241 | return &SkPackARGB_as_RGBA; |
| 242 | } else { |
| 243 | return &SkPackARGB_as_BGRA; |
| 244 | } |
| 245 | } |
| 246 | } |
| 247 | |
Leon Scroggins III | da3e9ad | 2018-01-26 15:48:26 -0500 | [diff] [blame] | 248 | bool is_orientation_marker(const uint8_t* data, size_t data_length, SkEncodedOrigin* orientation); |
| 249 | |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 250 | #endif // SkCodecPriv_DEFINED |