src/chrome/utility/chrome_content_utility_client_unittest.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/common/chrome_utility_messages.h"
   6 #include "chrome/utility/chrome_content_utility_client.h"
   7 #include "ipc/ipc_channel.h"
   8 #include "testing/gtest/include/gtest/gtest.h"
   9 #include "ui/gfx/codec/jpeg_codec.h"
  10
  11 namespace {
  12
  13 bool CreateJPEGImage(int width,
  14                      int height,
  15                      SkColor color,
  16                      std::vector<unsigned char>* output) {
  17   SkBitmap bitmap;
  18   bitmap.allocN32Pixels(width, height);
  19   bitmap.eraseColor(color);
  20
  21   const int kQuality = 50;
  22   if (!gfx::JPEGCodec::Encode(
  23           static_cast<const unsigned char*>(bitmap.getPixels()),
  24           gfx::JPEGCodec::FORMAT_SkBitmap,
  25           width,
  26           height,
  27           bitmap.rowBytes(),
  28           kQuality,
  29           output)) {
  30     LOG(ERROR) << "Unable to encode " << width << "x" << height << " bitmap";
  31     return false;
  32   }
  33   return true;
  34 }
  35
  36 }  // namespace
  37
  38 typedef testing::Test ChromeContentUtilityClientTest;
  39
  40 // Test that DecodeImage() doesn't return image message > (max message size)
  41 TEST_F(ChromeContentUtilityClientTest, DecodeImageSizeLimit) {
  42   // Using actual limit generates 14000 x 9400 images, which causes the test to
  43   // timeout.  We test with a smaller limit for efficiency.
  44   const size_t kTestMessageSize = IPC::Channel::kMaximumMessageSize / 1024;
  45   ChromeContentUtilityClient::set_max_ipc_message_size_for_test(
  46       kTestMessageSize);
  47   // Approx max height for 3:2 image that will fit in IPC message;
  48   // 1.5 for width/height ratio, 4 for bytes/pixel
  49   int max_height_for_msg = sqrt(kTestMessageSize / (1.5 * 4));
  50   int base_msg_size = sizeof(ChromeUtilityHostMsg_DecodeImage_Succeeded);
  51
  52   // Sizes which should trigger dimension-halving 0, 1 and 2 times
  53   int heights[] = { max_height_for_msg - 10,
  54                     max_height_for_msg + 10,
  55                     2 * max_height_for_msg + 10 };
  56   int widths[] = { heights[0] * 3 / 2, heights[1] * 3 / 2, heights[2] * 3 / 2 };
  57   for (size_t i = 0; i < arraysize(heights); i++) {
  58     std::vector<unsigned char> jpg;
  59     CreateJPEGImage(widths[i], heights[i], SK_ColorRED, &jpg);
  60     SkBitmap bitmap = ChromeContentUtilityClient::DecodeImage(jpg, true);
  61
  62     // Check that image has been shrunk appropriately
  63     EXPECT_LT(bitmap.computeSize64() + base_msg_size,
  64               static_cast<int64_t>(kTestMessageSize));
  65     // Android does its own image shrinking for memory conservation deeper in
  66     // the decode, so more specific tests here won't work.
  67 #if !defined(OS_ANDROID)
  68     EXPECT_EQ(widths[i] >> i, bitmap.width());
  69     EXPECT_EQ(heights[i] >> i, bitmap.height());
  70
  71     // Check that if resize not requested and image exceeds IPC size limit,
  72     // an empty image is returned
  73     if (heights[i] > max_height_for_msg) {
  74       SkBitmap empty_bmp = ChromeContentUtilityClient::DecodeImage(jpg, false);
  75       EXPECT_TRUE(empty_bmp.empty());
  76     }
  77 #endif
  78   }
  79 }