chromium/third_party/skia/src/codec/SkWebpCodec.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/SkWebpCodec.h"

#include "include/codec/SkCodec.h"
#include "include/codec/SkCodecAnimation.h"
#include "include/codec/SkWebpDecoder.h"
#include "include/core/SkAlphaType.h"
#include "include/core/SkBitmap.h"
#include "include/core/SkColorType.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkRect.h"
#include "include/core/SkSize.h"
#include "include/core/SkStream.h"
#include "include/private/base/SkAlign.h"
#include "include/private/base/SkMath.h"
#include "include/private/base/SkTFitsIn.h"
#include "include/private/base/SkTemplates.h"
#include "include/private/base/SkTo.h"
#include "modules/skcms/skcms.h"
#include "src/codec/SkParseEncodedOrigin.h"
#include "src/codec/SkSampler.h"
#include "src/core/SkRasterPipeline.h"
#include "src/core/SkRasterPipelineOpContexts.h"
#include "src/core/SkRasterPipelineOpList.h"
#include "src/core/SkStreamPriv.h"

#include <algorithm>
#include <cstdint>
#include <cstring>
#include <utility>

// A WebP decoder on top of (subset of) libwebp
// For more information on WebP image format, and libwebp library, see:
//   https://code.google.com/speed/webp/
//   http://www.webmproject.org/code/#libwebp-webp-image-library
//   https://chromium.googlesource.com/webm/libwebp

// If moving libwebp out of skia source tree, path for webp headers must be
// updated accordingly. Here, we enforce using local copy in webp sub-directory.
#include "webp/decode.h"  // NO_G3_REWRITE
#include "webp/demux.h"  // NO_G3_REWRITE
#include "webp/mux_types.h"  // NO_G3_REWRITE

bool SkWebpCodec::IsWebp(const void* buf, size_t bytesRead) { … }

// Parse headers of RIFF container, and check for valid Webp (VP8) content.
// Returns an SkWebpCodec on success
std::unique_ptr<SkCodec> SkWebpCodec::MakeFromStream(std::unique_ptr<SkStream> stream,
                                                     Result* result) { … }

static WEBP_CSP_MODE webp_decode_mode(SkColorType dstCT, bool premultiply) { … }

SkWebpCodec::Frame* SkWebpCodec::FrameHolder::appendNewFrame(bool hasAlpha) { … }

bool SkWebpCodec::onGetValidSubset(SkIRect* desiredSubset) const { … }

int SkWebpCodec::onGetRepetitionCount() { … }

int SkWebpCodec::onGetFrameCount() { … }

const SkFrame* SkWebpCodec::FrameHolder::onGetFrame(int i) const { … }

const SkWebpCodec::Frame* SkWebpCodec::FrameHolder::frame(int i) const { … }

bool SkWebpCodec::onGetFrameInfo(int i, FrameInfo* frameInfo) const { … }

static bool is_8888(SkColorType colorType) { … }

// Requires that the src input be unpremultiplied (or opaque).
static void blend_line(SkColorType dstCT, void* dst,
                       SkColorType srcCT, const void* src,
                       SkAlphaType dstAt,
                       bool srcHasAlpha,
                       int width) { … }

SkCodec::Result SkWebpCodec::onGetPixels(const SkImageInfo& dstInfo, void* dst, size_t rowBytes,
                                         const Options& options, int* rowsDecodedPtr) { … }

SkWebpCodec::SkWebpCodec(SkEncodedInfo&& info, std::unique_ptr<SkStream> stream,
                         WebPDemuxer* demux, sk_sp<SkData> data, SkEncodedOrigin origin)
    : … { … }

namespace SkWebpDecoder {
bool IsWebp(const void* data, size_t len) { … }

std::unique_ptr<SkCodec> Decode(std::unique_ptr<SkStream> stream,
                                SkCodec::Result* outResult,
                                SkCodecs::DecodeContext) { … }

std::unique_ptr<SkCodec> Decode(sk_sp<SkData> data,
                                SkCodec::Result* outResult,
                                SkCodecs::DecodeContext) { … }
}  // namespace SkWebpDecoder