Introduce the image_decoder service

chrome/utility/image_decoder_impl_unittest.cc

-// Copyright 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 "chrome/utility/image_decoder_impl.h"
-
-#include <vector>
-
-#include "base/bind.h"
-#include "ipc/ipc_channel.h"
-#include "testing/gtest/include/gtest/gtest.h"
-#include "third_party/skia/include/core/SkBitmap.h"
-#include "ui/gfx/codec/jpeg_codec.h"
-
-namespace mojom {
-
-namespace {
-
-bool CreateJPEGImage(int width,
-                     int height,
-                     SkColor color,
-                     std::vector<unsigned char>* output) {
-  SkBitmap bitmap;
-  bitmap.allocN32Pixels(width, height);
-  bitmap.eraseColor(color);
-
-  const int kQuality = 50;
-  if (!gfx::JPEGCodec::Encode(
-          static_cast<const unsigned char*>(bitmap.getPixels()),
-          gfx::JPEGCodec::FORMAT_SkBitmap, width, height,
-          static_cast<int>(bitmap.rowBytes()), kQuality, output)) {
-    LOG(ERROR) << "Unable to encode " << width << "x" << height << " bitmap";
-    return false;
-  }
-  return true;
-}
-
-class Request {
- public:
-  explicit Request(ImageDecoderImpl* decoder) : decoder_(decoder) {}
-
-  void DecodeImage(const std::vector<unsigned char>& image, bool shrink) {
-    decoder_->DecodeImage(
-        image, ImageCodec::DEFAULT, shrink,
-        base::Bind(&Request::OnRequestDone, base::Unretained(this)));
-  }
-
-  const SkBitmap& bitmap() const { return bitmap_; }
-
- private:
-  void OnRequestDone(const SkBitmap& result_image) { bitmap_ = result_image; }
-
-  ImageDecoderImpl* decoder_;
-  SkBitmap bitmap_;
-};
-
-}  // namespace
-
-// Test that DecodeImage() doesn't return image message > (max message size)
-TEST(ImageDecoderImplTest, DecodeImageSizeLimit) {
-  // Using actual limit generates 14000 x 9400 images, which causes the test to
-  // timeout.  We test with a smaller limit for efficiency.
-  const size_t kTestMessageSize = IPC::Channel::kMaximumMessageSize / 1024;
-
-  ImageDecoderImpl decoder(kTestMessageSize);
-
-  // Approx max height for 3:2 image that will fit in IPC message;
-  // 1.5 for width/height ratio, 4 for bytes/pixel
-  int max_height_for_msg = sqrt(kTestMessageSize / (1.5 * 4));
-  int base_msg_size = sizeof(skia::mojom::Bitmap::Data_);
-
-  // Sizes which should trigger dimension-halving 0, 1 and 2 times
-  int heights[] = {max_height_for_msg - 10,
-                   max_height_for_msg + 10,
-                   2 * max_height_for_msg + 10};
-  int widths[] = {heights[0] * 3 / 2, heights[1] * 3 / 2, heights[2] * 3 / 2};
-  for (size_t i = 0; i < arraysize(heights); i++) {
-    std::vector<unsigned char> jpg;
-    ASSERT_TRUE(CreateJPEGImage(widths[i], heights[i], SK_ColorRED, &jpg));
-
-    Request request(&decoder);
-    request.DecodeImage(jpg, true);
-    ASSERT_FALSE(request.bitmap().isNull());
-
-    // Check that image has been shrunk appropriately
-    EXPECT_LT(request.bitmap().computeSize64() + base_msg_size,
-              static_cast<int64_t>(kTestMessageSize));
-// Android does its own image shrinking for memory conservation deeper in
-// the decode, so more specific tests here won't work.
-#if !defined(OS_ANDROID)
-    EXPECT_EQ(widths[i] >> i, request.bitmap().width());
-    EXPECT_EQ(heights[i] >> i, request.bitmap().height());
-
-    // Check that if resize not requested and image exceeds IPC size limit,
-    // an empty image is returned
-    if (heights[i] > max_height_for_msg) {
-      Request request(&decoder);
-      request.DecodeImage(jpg, false);
-      EXPECT_TRUE(request.bitmap().isNull());
-    }
-#endif
-  }
-}
-
-TEST(ImageDecoderImplTest, DecodeImageFailed) {
-  ImageDecoderImpl decoder(IPC::Channel::kMaximumMessageSize);
-
-  // The "jpeg" is just some "random" data;
-  const char kRandomData[] = "u gycfy7xdjkhfgui bdui ";
-  std::vector<unsigned char> jpg(kRandomData,
-                                 kRandomData + sizeof(kRandomData));
-
-  Request request(&decoder);
-  request.DecodeImage(jpg, false);
-  EXPECT_TRUE(request.bitmap().isNull());
-}
-
-}  // namespace mojom