Use SkJpegEncoder in WebKit platform

third_party/WebKit/Source/platform/image-encoders/ImageEncoder.cpp

+// 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.
+
+#include "platform/image-encoders/ImageEncoder.h"
+
+namespace blink {
+
+bool ImageEncoder::Encode(Vector<unsigned char>* dst,
+                          const SkPixmap& src,
+                          const SkJpegEncoder::Options& options) {
+  VectorWStream dst_stream(dst);
+  return SkJpegEncoder::Encode(&dst_stream, src, options);
+}
+
+bool ImageEncoder::Encode(Vector<unsigned char>* dst,
+                          const SkPixmap& src,
+                          const SkPngEncoder::Options& options) {
+  VectorWStream dst_stream(dst);
+  return SkPngEncoder::Encode(&dst_stream, src, options);
+}
+
+std::unique_ptr<ImageEncoder> ImageEncoder::Create(
+    Vector<unsigned char>* dst,
+    const SkPixmap& src,
+    const SkJpegEncoder::Options& options) {
+  std::unique_ptr<ImageEncoder> image_encoder(new ImageEncoder(dst));
+  image_encoder->encoder_ =
+      SkJpegEncoder::Make(&image_encoder->dst_, src, options);
+  if (!image_encoder->encoder_) {
+    return nullptr;
+  }
+
+  return image_encoder;
+}
+
+std::unique_ptr<ImageEncoder> ImageEncoder::Create(
+    Vector<unsigned char>* dst,
+    const SkPixmap& src,
+    const SkPngEncoder::Options& options) {
+  std::unique_ptr<ImageEncoder> image_encoder(new ImageEncoder(dst));
+  image_encoder->encoder_ =
+      SkPngEncoder::Make(&image_encoder->dst_, src, options);
+  if (!image_encoder->encoder_) {
+    return nullptr;
+  }
+
+  return image_encoder;
+}
+
+int ImageEncoder::ComputeJpegQuality(double quality) {
+  int compression_quality = 92;  // Default value
+  if (quality >= 0.0 && quality <= 1.0)
+    compression_quality = static_cast<int>(quality * 100 + 0.5);
+  return compression_quality;
+}
+};