chromium/third_party/skia/src/codec/SkBmpRLECodec.cpp

/*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "src/codec/SkBmpRLECodec.h"

#include "include/core/SkAlphaType.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorPriv.h"
#include "include/core/SkColorType.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkSize.h"
#include "include/core/SkStream.h"
#include "include/private/SkColorData.h"
#include "include/private/SkEncodedInfo.h"
#include "include/private/base/SkAlign.h"
#include "include/private/base/SkMalloc.h"
#include "include/private/base/SkTemplates.h"
#include "src/codec/SkCodecPriv.h"

#include <algorithm>
#include <cstring>
#include <memory>
#include <utility>

/*
 * Creates an instance of the decoder
 * Called only by NewFromStream
 */
SkBmpRLECodec::SkBmpRLECodec(SkEncodedInfo&& info,
                             std::unique_ptr<SkStream> stream,
                             uint16_t bitsPerPixel, uint32_t numColors,
                             uint32_t bytesPerColor, uint32_t offset,
                             SkCodec::SkScanlineOrder rowOrder)
    : … { … }

/*
 * Initiates the bitmap decode
 */
SkCodec::Result SkBmpRLECodec::onGetPixels(const SkImageInfo& dstInfo,
                                           void* dst, size_t dstRowBytes,
                                           const Options& opts,
                                           int* rowsDecoded) { … }

/*
 * Process the color table for the bmp input
 */
 bool SkBmpRLECodec::createColorTable(SkColorType dstColorType) { … }

bool SkBmpRLECodec::initializeStreamBuffer() { … }

/*
 * @return the number of bytes remaining in the stream buffer after
 *         attempting to read more bytes from the stream
 */
size_t SkBmpRLECodec::checkForMoreData() { … }

/*
 * Set an RLE pixel using the color table
 */
void SkBmpRLECodec::setPixel(void* dst, size_t dstRowBytes,
                             const SkImageInfo& dstInfo, uint32_t x, uint32_t y,
                             uint8_t index) { … }

/*
 * Set an RLE pixel from R, G, B values
 */
void SkBmpRLECodec::setRGBPixel(void* dst, size_t dstRowBytes,
                                const SkImageInfo& dstInfo, uint32_t x,
                                uint32_t y, uint8_t red, uint8_t green,
                                uint8_t blue) { … }

SkCodec::Result SkBmpRLECodec::onPrepareToDecode(const SkImageInfo& dstInfo,
        const SkCodec::Options& options) { … }

/*
 * Performs the bitmap decoding for RLE input format
 * RLE decoding is performed all at once, rather than a one row at a time
 */
int SkBmpRLECodec::decodeRows(const SkImageInfo& info, void* dst, size_t dstRowBytes,
        const Options& opts) { … }

int SkBmpRLECodec::decodeRLE(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes) { … }

bool SkBmpRLECodec::skipRows(int count) { … }

// FIXME: Make SkBmpRLECodec have no knowledge of sampling.
//        Or it should do all sampling natively.
//        It currently is a hybrid that needs to know what SkScaledCodec is doing.
class SkBmpRLESampler : public SkSampler { … };

SkSampler* SkBmpRLECodec::getSampler(bool createIfNecessary) { … }

int SkBmpRLECodec::setSampleX(int sampleX) { … }

int SkBmpRLECodec::fillWidth() const { … }