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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 "SkColorTable.h"
#include "SkImageInfo.h"
#include "SkSwizzler.h"
#include "SkTypes.h"
#include "SkUtils.h"
/*
*
* Helper routine for alpha result codes
*
*/
#define INIT_RESULT_ALPHA \
uint8_t zeroAlpha = 0; \
uint8_t maxAlpha = 0xFF;
#define UPDATE_RESULT_ALPHA(alpha) \
zeroAlpha |= (alpha); \
maxAlpha &= (alpha);
#define COMPUTE_RESULT_ALPHA \
SkSwizzler::GetResult(zeroAlpha, maxAlpha);
/*
* If there is a color table, get a pointer to the colors, otherwise return NULL
*/
static const SkPMColor* get_color_ptr(SkColorTable* colorTable) {
return NULL != colorTable ? colorTable->readColors() : NULL;
}
/*
*
* Copy the codec color table back to the client when kIndex8 color type is requested
*
*/
static inline void copy_color_table(const SkImageInfo& dstInfo, SkColorTable* colorTable,
SkPMColor* inputColorPtr, int* inputColorCount) {
if (kIndex_8_SkColorType == dstInfo.colorType()) {
SkASSERT(NULL != inputColorPtr);
SkASSERT(NULL != inputColorCount);
SkASSERT(NULL != colorTable);
memcpy(inputColorPtr, colorTable->readColors(), *inputColorCount * 4);
}
}
/*
*
* 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
}
#ifdef SK_PRINT_CODEC_MESSAGES
#define SkCodecPrintf SkDebugf
#else
#define SkCodecPrintf(...)
#endif
#endif // SkCodecPriv_DEFINED
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