cc/raster/texture_compressor_etc1_unittest.cc

   1 // Copyright 2015 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 "cc/raster/texture_compressor.h"
   6
   7 #include "testing/gtest/include/gtest/gtest.h"
   8
   9 namespace cc {
  10 namespace {
  11
  12 const int kImageWidth = 256;
  13 const int kImageHeight = 256;
  14 const int kImageChannels = 4;
  15 const int kImageSizeInBytes = kImageWidth * kImageHeight * kImageChannels;
  16
  17 TEST(TextureCompressorETC1Test, Compress256x256Ratio) {
  18   scoped_ptr<TextureCompressor> compressor =
  19       TextureCompressor::Create(TextureCompressor::kFormatETC1);
  20   uint8_t src[kImageSizeInBytes];
  21   uint8_t dst[kImageSizeInBytes];
  22   const unsigned int kImagePoison = 0xDEADBEEF;
  23
  24   // Poison destination bytes so we can see how much has been
  25   // overwritten by compression algorithm.
  26   uint32_t* dst_32 = reinterpret_cast<uint32_t*>(dst);
  27   for (int i = 0; i < kImageWidth * kImageHeight; i++) {
  28     dst_32[i] = kImagePoison;
  29   }
  30
  31   // Generate test texture.
  32   for (int i = 0; i < kImageSizeInBytes; i++) {
  33     src[i] = i % 256;
  34   }
  35
  36   compressor->Compress(src, dst, kImageWidth, kImageHeight,
  37                        TextureCompressor::kQualityLow);
  38
  39   int compressed_size = 0;
  40   for (compressed_size = 0; compressed_size < kImageWidth * kImageHeight;
  41        compressed_size++) {
  42     if (dst_32[compressed_size] == kImagePoison) {
  43       // Represents size in bytes of the compressed block.
  44       compressed_size = compressed_size * 4;
  45       break;
  46     }
  47   }
  48
  49   // Check if compression ratio is 8:1 for RGBA or BGRA images, after discarding
  50   // alpha channel.
  51   EXPECT_EQ(kImageSizeInBytes, compressed_size * 8);
  52 }
  53
  54 }  // namespace
  55 }  // namespace cc