| // Copyright 2017 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_IMAGE_ENCODERS_IMAGE_ENCODER_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_IMAGE_ENCODERS_IMAGE_ENCODER_H_ |
| |
| #include "third_party/blink/renderer/platform/graphics/graphics_types.h" |
| #include "third_party/blink/renderer/platform/platform_export.h" |
| #include "third_party/blink/renderer/platform/wtf/vector.h" |
| #include "third_party/skia/include/core/SkStream.h" |
| #include "third_party/skia/include/encode/SkJpegEncoder.h" |
| #include "third_party/skia/include/encode/SkPngEncoder.h" |
| #include "third_party/skia/include/encode/SkWebpEncoder.h" |
| |
| namespace blink { |
| |
| class VectorWStream : public SkWStream { |
| public: |
| VectorWStream(Vector<unsigned char>* dst) : dst_(dst) { |
| DCHECK(dst_); |
| DCHECK_EQ(0UL, dst->size()); |
| } |
| |
| bool write(const void* buffer, size_t size) override { |
| DCHECK_LE(size, std::numeric_limits<wtf_size_t>::max()); |
| dst_->Append((const unsigned char*)buffer, static_cast<wtf_size_t>(size)); |
| return true; |
| } |
| |
| size_t bytesWritten() const override { return dst_->size(); } |
| |
| private: |
| // Does not have ownership. |
| Vector<unsigned char>* dst_; |
| }; |
| |
| class PLATFORM_EXPORT ImageEncoder { |
| public: |
| static bool Encode(Vector<unsigned char>* dst, |
| const SkPixmap& src, |
| const SkJpegEncoder::Options&); |
| |
| static bool Encode(Vector<unsigned char>* dst, |
| const SkPixmap& src, |
| const SkPngEncoder::Options&); |
| |
| static bool Encode(Vector<unsigned char>* dst, |
| const SkPixmap& src, |
| const SkWebpEncoder::Options&); |
| |
| static int MaxDimension(ImageEncodingMimeType mime_type); |
| |
| static std::unique_ptr<ImageEncoder> Create(Vector<unsigned char>* dst, |
| const SkPixmap& src, |
| const SkJpegEncoder::Options&); |
| |
| static std::unique_ptr<ImageEncoder> Create(Vector<unsigned char>* dst, |
| const SkPixmap& src, |
| const SkPngEncoder::Options&); |
| |
| bool encodeRows(int numRows) { return encoder_->encodeRows(numRows); } |
| |
| /** |
| * If quality is in [0, 1], this will simply convert to a [0, 100] |
| * integer scale (which is what is used by libjpeg-turbo). |
| * |
| * Otherwise, this will return the default value (92). |
| */ |
| static int ComputeJpegQuality(double quality); |
| |
| /** |
| * Sets Skia encoding options based on the requested quality. |
| * |
| * If quality is 1, this will signal a lossless encode. |
| * |
| * Otherwise, this will use webp lossy encoding. |
| * If quality is in [0, 1), this will simply convert to a [0, 100) |
| * float scale (which is what is used by libwebp). If the quality |
| * is out of range, this will perform a lossy encode with the default |
| * value (80). |
| */ |
| static SkWebpEncoder::Options ComputeWebpOptions(double quality); |
| |
| private: |
| ImageEncoder(Vector<unsigned char>* dst) : dst_(dst) {} |
| |
| VectorWStream dst_; |
| std::unique_ptr<SkEncoder> encoder_; |
| }; |
| }; |
| |
| #endif |