| /* |
| * Copyright 2015 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkCodecPriv_DEFINED |
| #define SkCodecPriv_DEFINED |
| |
| #include "include/codec/SkEncodedOrigin.h" |
| #include "include/core/SkImageInfo.h" |
| #include "include/core/SkTypes.h" |
| #include "include/private/SkColorData.h" |
| #include "include/private/SkEncodedInfo.h" |
| #include "src/codec/SkColorTable.h" |
| |
| #ifdef SK_PRINT_CODEC_MESSAGES |
| #define SkCodecPrintf SkDebugf |
| #else |
| #define SkCodecPrintf(...) |
| #endif |
| |
| // Defined in SkCodec.cpp |
| bool sk_select_xform_format(SkColorType colorType, bool forColorTable, |
| skcms_PixelFormat* outFormat); |
| |
| // FIXME: Consider sharing with dm, nanbench, and tools. |
| static inline float get_scale_from_sample_size(int sampleSize) { |
| return 1.0f / ((float) sampleSize); |
| } |
| |
| static inline bool is_valid_subset(const SkIRect& subset, const SkISize& imageDims) { |
| return SkIRect::MakeSize(imageDims).contains(subset); |
| } |
| |
| /* |
| * returns a scaled dimension based on the original dimension and the sampleSize |
| * NOTE: we round down here for scaled dimension to match the behavior of SkImageDecoder |
| * FIXME: I think we should call this get_sampled_dimension(). |
| */ |
| static inline int get_scaled_dimension(int srcDimension, int sampleSize) { |
| if (sampleSize > srcDimension) { |
| return 1; |
| } |
| return srcDimension / sampleSize; |
| } |
| |
| /* |
| * Returns the first coordinate that we will keep during a scaled decode. |
| * The output can be interpreted as an x-coordinate or a y-coordinate. |
| * |
| * This does not need to be called and is not called when sampleFactor == 1. |
| */ |
| static inline int get_start_coord(int sampleFactor) { return sampleFactor / 2; }; |
| |
| /* |
| * Given a coordinate in the original image, this returns the corresponding |
| * coordinate in the scaled image. This function is meaningless if |
| * IsCoordNecessary returns false. |
| * The output can be interpreted as an x-coordinate or a y-coordinate. |
| * |
| * This does not need to be called and is not called when sampleFactor == 1. |
| */ |
| static inline int get_dst_coord(int srcCoord, int sampleFactor) { return srcCoord / sampleFactor; }; |
| |
| /* |
| * When scaling, we will discard certain y-coordinates (rows) and |
| * x-coordinates (columns). This function returns true if we should keep the |
| * coordinate and false otherwise. |
| * The inputs may be x-coordinates or y-coordinates. |
| * |
| * This does not need to be called and is not called when sampleFactor == 1. |
| */ |
| static inline bool is_coord_necessary(int srcCoord, int sampleFactor, int scaledDim) { |
| // Get the first coordinate that we want to keep |
| int startCoord = get_start_coord(sampleFactor); |
| |
| // Return false on edge cases |
| if (srcCoord < startCoord || get_dst_coord(srcCoord, sampleFactor) >= scaledDim) { |
| return false; |
| } |
| |
| // Every sampleFactor rows are necessary |
| return ((srcCoord - startCoord) % sampleFactor) == 0; |
| } |
| |
| static inline bool valid_alpha(SkAlphaType dstAlpha, bool srcIsOpaque) { |
| if (kUnknown_SkAlphaType == dstAlpha) { |
| return false; |
| } |
| |
| if (srcIsOpaque) { |
| if (kOpaque_SkAlphaType != dstAlpha) { |
| SkCodecPrintf("Warning: an opaque image should be decoded as opaque " |
| "- it is being decoded as non-opaque, which will draw slower\n"); |
| } |
| return true; |
| } |
| |
| return dstAlpha != kOpaque_SkAlphaType; |
| } |
| |
| /* |
| * If there is a color table, get a pointer to the colors, otherwise return nullptr |
| */ |
| static inline const SkPMColor* get_color_ptr(SkColorTable* colorTable) { |
| return nullptr != colorTable ? colorTable->readColors() : nullptr; |
| } |
| |
| /* |
| * Compute row bytes for an image using pixels per byte |
| */ |
| static inline size_t compute_row_bytes_ppb(int width, uint32_t pixelsPerByte) { |
| return (width + pixelsPerByte - 1) / pixelsPerByte; |
| } |
| |
| /* |
| * Compute row bytes for an image using bytes per pixel |
| */ |
| static inline size_t compute_row_bytes_bpp(int width, uint32_t bytesPerPixel) { |
| return width * bytesPerPixel; |
| } |
| |
| /* |
| * Compute row bytes for an image |
| */ |
| static inline size_t compute_row_bytes(int width, uint32_t bitsPerPixel) { |
| if (bitsPerPixel < 16) { |
| SkASSERT(0 == 8 % bitsPerPixel); |
| const uint32_t pixelsPerByte = 8 / bitsPerPixel; |
| return compute_row_bytes_ppb(width, pixelsPerByte); |
| } else { |
| SkASSERT(0 == bitsPerPixel % 8); |
| const uint32_t bytesPerPixel = bitsPerPixel / 8; |
| return compute_row_bytes_bpp(width, bytesPerPixel); |
| } |
| } |
| |
| /* |
| * Get a byte from a buffer |
| * This method is unsafe, the caller is responsible for performing a check |
| */ |
| static inline uint8_t get_byte(const uint8_t* buffer, uint32_t i) { |
| return buffer[i]; |
| } |
| |
| /* |
| * Get a short from a buffer |
| * This method is unsafe, the caller is responsible for performing a check |
| */ |
| static inline uint16_t get_short(const uint8_t* buffer, uint32_t i) { |
| uint16_t result; |
| memcpy(&result, &(buffer[i]), 2); |
| #ifdef SK_CPU_BENDIAN |
| return SkEndianSwap16(result); |
| #else |
| return result; |
| #endif |
| } |
| |
| /* |
| * Get an int from a buffer |
| * This method is unsafe, the caller is responsible for performing a check |
| */ |
| static inline uint32_t get_int(const uint8_t* buffer, uint32_t i) { |
| uint32_t result; |
| memcpy(&result, &(buffer[i]), 4); |
| #ifdef SK_CPU_BENDIAN |
| return SkEndianSwap32(result); |
| #else |
| return result; |
| #endif |
| } |
| |
| /* |
| * @param data Buffer to read bytes from |
| * @param isLittleEndian Output parameter |
| * Indicates if the data is little endian |
| * Is unaffected on false returns |
| */ |
| static inline bool is_valid_endian_marker(const uint8_t* data, bool* isLittleEndian) { |
| // II indicates Intel (little endian) and MM indicates motorola (big endian). |
| if (('I' != data[0] || 'I' != data[1]) && ('M' != data[0] || 'M' != data[1])) { |
| return false; |
| } |
| |
| *isLittleEndian = ('I' == data[0]); |
| return true; |
| } |
| |
| static inline uint16_t get_endian_short(const uint8_t* data, bool littleEndian) { |
| if (littleEndian) { |
| return (data[1] << 8) | (data[0]); |
| } |
| |
| return (data[0] << 8) | (data[1]); |
| } |
| |
| static inline uint32_t get_endian_int(const uint8_t* data, bool littleEndian) { |
| if (littleEndian) { |
| return (data[3] << 24) | (data[2] << 16) | (data[1] << 8) | (data[0]); |
| } |
| |
| return (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | (data[3]); |
| } |
| |
| static inline SkPMColor premultiply_argb_as_rgba(U8CPU a, U8CPU r, U8CPU g, U8CPU b) { |
| if (a != 255) { |
| r = SkMulDiv255Round(r, a); |
| g = SkMulDiv255Round(g, a); |
| b = SkMulDiv255Round(b, a); |
| } |
| |
| return SkPackARGB_as_RGBA(a, r, g, b); |
| } |
| |
| static inline SkPMColor premultiply_argb_as_bgra(U8CPU a, U8CPU r, U8CPU g, U8CPU b) { |
| if (a != 255) { |
| r = SkMulDiv255Round(r, a); |
| g = SkMulDiv255Round(g, a); |
| b = SkMulDiv255Round(b, a); |
| } |
| |
| return SkPackARGB_as_BGRA(a, r, g, b); |
| } |
| |
| static inline bool is_rgba(SkColorType colorType) { |
| #ifdef SK_PMCOLOR_IS_RGBA |
| return (kBGRA_8888_SkColorType != colorType); |
| #else |
| return (kRGBA_8888_SkColorType == colorType); |
| #endif |
| } |
| |
| // Method for coverting to a 32 bit pixel. |
| typedef uint32_t (*PackColorProc)(U8CPU a, U8CPU r, U8CPU g, U8CPU b); |
| |
| static inline PackColorProc choose_pack_color_proc(bool isPremul, SkColorType colorType) { |
| bool isRGBA = is_rgba(colorType); |
| if (isPremul) { |
| if (isRGBA) { |
| return &premultiply_argb_as_rgba; |
| } else { |
| return &premultiply_argb_as_bgra; |
| } |
| } else { |
| if (isRGBA) { |
| return &SkPackARGB_as_RGBA; |
| } else { |
| return &SkPackARGB_as_BGRA; |
| } |
| } |
| } |
| |
| bool is_orientation_marker(const uint8_t* data, size_t data_length, SkEncodedOrigin* orientation); |
| |
| #endif // SkCodecPriv_DEFINED |