cc: Add base64 encoding to picture

cc/resources/picture_unittest.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 "cc/resources/picture.h"
+
+#include "base/memory/ref_counted.h"
+#include "cc/test/fake_content_layer_client.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkDevice.h"
+#include "third_party/skia/include/core/SkTileGridPicture.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/skia_util.h"
+
+namespace cc {
+namespace {
+
+void DrawPicture(unsigned char* buffer,
+                 gfx::Rect layer_rect,
+                 scoped_refptr<Picture> picture) {
+  SkBitmap bitmap;
+  bitmap.setConfig(SkBitmap::kARGB_8888_Config,
+                   layer_rect.width(),
+                   layer_rect.height());
+  bitmap.setPixels(buffer);
+  SkDevice device(bitmap);
+  SkCanvas canvas(&device);
+  canvas.clipRect(gfx::RectToSkRect(layer_rect));
+  picture->Raster(&canvas, layer_rect, 1.0f, false);
+}
+
+TEST(PictureTest, AsBase64String) {
+  gfx::Rect layer_rect(100, 100);
+
+  SkTileGridPicture::TileGridInfo tile_grid_info;
+  tile_grid_info.fTileInterval = SkISize::Make(100, 100);
+  tile_grid_info.fMargin.setEmpty();
+  tile_grid_info.fOffset.setZero();
+
+  FakeContentLayerClient content_layer_client;
+
+  // Construct pictures.
+  // Single full-size rect picture.
+  content_layer_client.add_draw_rect(layer_rect);
+  scoped_refptr<Picture> one_rect_picture = Picture::Create(layer_rect);
+  one_rect_picture->Record(&content_layer_client, NULL, tile_grid_info);
+  std::string serialized_one_rect;
+  one_rect_picture->AsBase64String(&serialized_one_rect);
+
+  // Reconstruct the picture.
+  scoped_refptr<Picture> one_rect_picture_check = Picture::Create(layer_rect);
+  one_rect_picture_check->SetPictureFromBase64String(serialized_one_rect);
+
+  // Check for equivalence.
+  unsigned char one_rect_buffer[4 * 100 * 100] = {0};
+  DrawPicture(one_rect_buffer, layer_rect, one_rect_picture);
+  unsigned char one_rect_buffer_check[4 * 100 * 100] = {0};
+  DrawPicture(one_rect_buffer_check, layer_rect, one_rect_picture_check);
+
+  EXPECT_TRUE(
+      memcmp(one_rect_buffer, one_rect_buffer_check, 4 * 100 * 100) == 0);
+
+  // Two rect picture.
+  content_layer_client.add_draw_rect(gfx::Rect(25, 25, 50, 50));
+  scoped_refptr<Picture> two_rect_picture = Picture::Create(layer_rect);
+  two_rect_picture->Record(&content_layer_client, NULL, tile_grid_info);
+  std::string serialized_two_rect;
+  two_rect_picture->AsBase64String(&serialized_two_rect);
+
+  // Reconstruct the picture.
+  scoped_refptr<Picture> two_rect_picture_check = Picture::Create(layer_rect);
+  two_rect_picture_check->SetPictureFromBase64String(serialized_two_rect);
+
+  // Check for equivalence.
+  unsigned char two_rect_buffer[4 * 100 * 100] = {0};
+  DrawPicture(two_rect_buffer, layer_rect, two_rect_picture);
+  unsigned char two_rect_buffer_check[4 * 100 * 100] = {0};
+  DrawPicture(two_rect_buffer_check, layer_rect, two_rect_picture_check);
+
+  EXPECT_TRUE(
+      memcmp(two_rect_buffer, two_rect_buffer_check, 4 * 100 * 100) == 0);
+}
+
+}  // namespace
+}  // namespace cc