Android WebView: Make a custom Picture subclass

android_webview/native/aw_picture.cc

+// Copyright 2013 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 "android_webview/native/aw_picture.h"
+
+#include "android_webview/browser/in_process_view_renderer.h"
+#include "android_webview/native/java_browser_view_renderer_helper.h"
+#include "jni/AwPicture_jni.h"
+#include "third_party/skia/include/core/SkPicture.h"
+
+namespace android_webview {
+
+AwPicture::AwPicture(skia::RefPtr<SkPicture> picture)
+    : picture_(picture) {
+  DCHECK(picture_);
+}
+
+void AwPicture::Destroy(JNIEnv* env, jobject obj) {
+  delete this;
+}
+
+jint AwPicture::GetWidth(JNIEnv* env, jobject obj) {
+  return picture_->width();
+}
+
+jint AwPicture::GetHeight(JNIEnv* env, jobject obj) {
+  return picture_->height();
+}
+
+namespace {
+bool RenderPictureToCanvas(SkPicture* picture, SkCanvas* canvas) {
+  picture->draw(canvas);
+  return true;
+}
+}
+
+void AwPicture::Draw(JNIEnv* env, jobject obj, jobject canvas,
+                     jint left, jint top, jint right, jint bottom) {
+  bool ok = InProcessViewRenderer::RenderViaAuxilaryBitmapIfNeeded(
+      canvas,
+      JavaBrowserViewRendererHelper::GetInstance(),
+      gfx::Vector2d(),
+      gfx::Rect(left, top, right - left, bottom - top),
+      base::Bind(&RenderPictureToCanvas, base::Unretained(picture_.get())),
+      this);
+  LOG_IF(ERROR, !ok) << "Couldn't draw picture";
+}
+
+bool RegisterAwPicture(JNIEnv* env) {
+  return RegisterNativesImpl(env) >= 0;
+}
+
+}  // namespace android_webview