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Diffstat (limited to 'app/gfx/codec/jpeg_codec_unittest.cc')
-rw-r--r-- | app/gfx/codec/jpeg_codec_unittest.cc | 151 |
1 files changed, 0 insertions, 151 deletions
diff --git a/app/gfx/codec/jpeg_codec_unittest.cc b/app/gfx/codec/jpeg_codec_unittest.cc deleted file mode 100644 index bf8eaab..0000000 --- a/app/gfx/codec/jpeg_codec_unittest.cc +++ /dev/null @@ -1,151 +0,0 @@ -// Copyright (c) 2009 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 <math.h> - -#include "app/gfx/codec/jpeg_codec.h" -#include "testing/gtest/include/gtest/gtest.h" - -namespace gfx { - -// out of 100, this indicates how compressed it will be, this should be changed -// with jpeg equality threshold -// static int jpeg_quality = 75; // FIXME(brettw) -static int jpeg_quality = 100; - -// The threshold of average color differences where we consider two images -// equal. This number was picked to be a little above the observed difference -// using the above quality. -static double jpeg_equality_threshold = 1.0; - -// Computes the average difference between each value in a and b. A and b -// should be the same size. Used to see if two images are approximately equal -// in the presence of compression. -static double AveragePixelDelta(const std::vector<unsigned char>& a, - const std::vector<unsigned char>& b) { - // if the sizes are different, say the average difference is the maximum - if (a.size() != b.size()) - return 255.0; - if (a.size() == 0) - return 0; // prevent divide by 0 below - - double acc = 0.0; - for (size_t i = 0; i < a.size(); i++) - acc += fabs(static_cast<double>(a[i]) - static_cast<double>(b[i])); - - return acc / static_cast<double>(a.size()); -} - -static void MakeRGBImage(int w, int h, std::vector<unsigned char>* dat) { - dat->resize(w * h * 3); - for (int y = 0; y < h; y++) { - for (int x = 0; x < w; x++) { - unsigned char* org_px = &(*dat)[(y * w + x) * 3]; - org_px[0] = x * 3; // r - org_px[1] = x * 3 + 1; // g - org_px[2] = x * 3 + 2; // b - } - } -} - -TEST(JPEGCodec, EncodeDecodeRGB) { - int w = 20, h = 20; - - // create an image with known values - std::vector<unsigned char> original; - MakeRGBImage(w, h, &original); - - // encode, making sure it was compressed some - std::vector<unsigned char> encoded; - EXPECT_TRUE(JPEGCodec::Encode(&original[0], JPEGCodec::FORMAT_RGB, w, h, - w * 3, jpeg_quality, &encoded)); - EXPECT_GT(original.size(), encoded.size()); - - // decode, it should have the same size as the original - std::vector<unsigned char> decoded; - int outw, outh; - EXPECT_TRUE(JPEGCodec::Decode(&encoded[0], encoded.size(), - JPEGCodec::FORMAT_RGB, &decoded, - &outw, &outh)); - ASSERT_EQ(w, outw); - ASSERT_EQ(h, outh); - ASSERT_EQ(original.size(), decoded.size()); - - // Images must be approximately equal (compression will have introduced some - // minor artifacts). - ASSERT_GE(jpeg_equality_threshold, AveragePixelDelta(original, decoded)); -} - -TEST(JPEGCodec, EncodeDecodeRGBA) { - int w = 20, h = 20; - - // create an image with known values, a must be opaque because it will be - // lost during compression - std::vector<unsigned char> original; - original.resize(w * h * 4); - for (int y = 0; y < h; y++) { - for (int x = 0; x < w; x++) { - unsigned char* org_px = &original[(y * w + x) * 4]; - org_px[0] = x * 3; // r - org_px[1] = x * 3 + 1; // g - org_px[2] = x * 3 + 2; // b - org_px[3] = 0xFF; // a (opaque) - } - } - - // encode, making sure it was compressed some - std::vector<unsigned char> encoded; - EXPECT_TRUE(JPEGCodec::Encode(&original[0], JPEGCodec::FORMAT_RGBA, w, h, - w * 4, jpeg_quality, &encoded)); - EXPECT_GT(original.size(), encoded.size()); - - // decode, it should have the same size as the original - std::vector<unsigned char> decoded; - int outw, outh; - EXPECT_TRUE(JPEGCodec::Decode(&encoded[0], encoded.size(), - JPEGCodec::FORMAT_RGBA, &decoded, - &outw, &outh)); - ASSERT_EQ(w, outw); - ASSERT_EQ(h, outh); - ASSERT_EQ(original.size(), decoded.size()); - - // Images must be approximately equal (compression will have introduced some - // minor artifacts). - ASSERT_GE(jpeg_equality_threshold, AveragePixelDelta(original, decoded)); -} - -// Test that corrupted data decompression causes failures. -TEST(JPEGCodec, DecodeCorrupted) { - int w = 20, h = 20; - - // some random data (an uncompressed image) - std::vector<unsigned char> original; - MakeRGBImage(w, h, &original); - - // it should fail when given non-JPEG compressed data - std::vector<unsigned char> output; - int outw, outh; - ASSERT_FALSE(JPEGCodec::Decode(&original[0], original.size(), - JPEGCodec::FORMAT_RGB, &output, - &outw, &outh)); - - // make some compressed data - std::vector<unsigned char> compressed; - ASSERT_TRUE(JPEGCodec::Encode(&original[0], JPEGCodec::FORMAT_RGB, w, h, - w * 3, jpeg_quality, &compressed)); - - // try decompressing a truncated version - ASSERT_FALSE(JPEGCodec::Decode(&compressed[0], compressed.size() / 2, - JPEGCodec::FORMAT_RGB, &output, - &outw, &outh)); - - // corrupt it and try decompressing that - for (int i = 10; i < 30; i++) - compressed[i] = i; - ASSERT_FALSE(JPEGCodec::Decode(&compressed[0], compressed.size(), - JPEGCodec::FORMAT_RGB, &output, - &outw, &outh)); -} - -} // namespace gfx |