Implement SkEncodeImage()

ui/gfx/codec/install_skia_codec.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/install_skia_codec.h"
+
+#include "base/synchronization/lock.h"
+#include "skia/ext/skia_encode_image.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "third_party/skia/include/core/SkEncodedImageFormat.h"
+#include "third_party/skia/include/core/SkStream.h"
+#include "ui/gfx/codec/jpeg_codec.h"
+#include "ui/gfx/codec/png_codec.h"
+
+static bool Encode(SkWStream* dst,
+                   const SkPixmap& pixmap,
+                   SkEncodedImageFormat format,
+                   int quality) {
+  SkBitmap bitmap;

[scroggo, 2016/11/29 14:52:54]

This is only used in the PNG case - why not move it there?

[hal.canary, 2016/11/29 18:24:27]

Done.

+  std::vector<unsigned char> buffer;
+  switch (format) {
+    case SkEncodedImageFormat::kPNG:
+      return bitmap.installPixels(pixmap) &&
+             gfx::PNGCodec::EncodeBGRASkBitmap(bitmap, false, &buffer) &&
+             dst->write(&buffer[0], buffer.size());
+    case SkEncodedImageFormat::kJPEG:
+      return gfx::JPEGCodec::Encode((const unsigned char*)pixmap.addr(),

[scroggo, 2016/11/29 14:52:54]

reinterpret_cast?

[hal.canary, 2016/11/29 18:24:27]

Done.

+                                    gfx::JPEGCodec::FORMAT_SkBitmap,
+                                    pixmap.width(), pixmap.height(),
+                                    (int)pixmap.rowBytes(), quality, &buffer) &&

[scroggo, 2016/11/29 14:52:54]

static_cast?

[hal.canary, 2016/11/29 18:24:27]

Done.

+             dst->write(&buffer[0], buffer.size());
+    default:
+      return false;
+  }
+}
+
+void gfx::InstallCodecsIntoSkia() {
+  // FIXME:  What is the chromium version of SkOnce?
+  base::Lock lock;
+  base::AutoLock autoLock(lock);
+  static bool g_done = false;
+  if (!g_done) {
+    skia::SetEmageEncoder(&Encode);
+    g_done = true;
+  }
+}