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- /*
- * 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(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(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(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 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
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