Implement SkEncodeImage()

ui/gfx/codec/skia_image_encoder_adapter.cc

+// Copyright (c) 2016 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 "ui/gfx/codec/skia_image_encoder_adapter.h"
+
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "third_party/skia/include/core/SkStream.h"
+#include "ui/gfx/codec/jpeg_codec.h"
+#include "ui/gfx/codec/png_codec.h"
+#include "ui/gfx/geometry/size.h"
+
+bool gfx::EncodeSkiaImage(SkWStream* dst,
+                          const SkPixmap& pixmap,
+                          SkEncodedImageFormat format,
+                          int quality) {
+  if (kN32_SkColorType != pixmap.colorType() ||
+      (kPremul_SkAlphaType != pixmap.alphaType() &&
+       kOpaque_SkAlphaType != pixmap.alphaType())) {
+    return false;
+  }
+  std::vector<unsigned char> buffer;
+  switch (format) {
+    case SkEncodedImageFormat::kPNG:
+      return gfx::PNGCodec::Encode(
+                 reinterpret_cast<const unsigned char*>(pixmap.addr()),
+                 gfx::PNGCodec::FORMAT_SkBitmap,
+                 gfx::Size(pixmap.width(), pixmap.height()),
+                 static_cast<int>(pixmap.rowBytes()), false,
+                 std::vector<gfx::PNGCodec::Comment>(), &buffer) &&
+             dst->write(buffer.data(), buffer.size());
+    case SkEncodedImageFormat::kJPEG:
+      return gfx::JPEGCodec::Encode(
+                 reinterpret_cast<const unsigned char*>(pixmap.addr()),
+                 gfx::JPEGCodec::FORMAT_SkBitmap, pixmap.width(),
+                 pixmap.height(), static_cast<int>(pixmap.rowBytes()), quality,
+                 &buffer) &&
+             dst->write(buffer.data(), buffer.size());
+    default:
+      return false;
+  }
+}