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Diffstat (limited to 'base/gfx/png_codec_unittest.cc')
| -rw-r--r-- | base/gfx/png_codec_unittest.cc | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/base/gfx/png_codec_unittest.cc b/base/gfx/png_codec_unittest.cc new file mode 100644 index 0000000..1b510aa --- /dev/null +++ b/base/gfx/png_codec_unittest.cc @@ -0,0 +1,223 @@ +// Copyright 2008, Google Inc. +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +#include <math.h> + +#include "base/gfx/png_encoder.h" +#include "base/gfx/png_decoder.h" +#include "testing/gtest/include/gtest/gtest.h" + +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 + } + } +} + +// Set use_transparency to write data into the alpha channel, otherwise it will +// be filled with 0xff. With the alpha channel stripped, this should yield the +// same image as MakeRGBImage above, so the code below can make reference +// images for conversion testing. +static void MakeRGBAImage(int w, int h, bool use_transparency, + std::vector<unsigned char>* dat) { + dat->resize(w * h * 4); + for (int y = 0; y < h; y++) { + for (int x = 0; x < w; x++) { + unsigned char* org_px = &(*dat)[(y * w + x) * 4]; + org_px[0] = x * 3; // r + org_px[1] = x * 3 + 1; // g + org_px[2] = x * 3 + 2; // b + if (use_transparency) + org_px[3] = x*3 + 3; // a + else + org_px[3] = 0xFF; // a (opaque) + } + } +} + +TEST(PNGCodec, EncodeDecodeRGB) { + const int w = 20, h = 20; + + // create an image with known values + std::vector<unsigned char> original; + MakeRGBImage(w, h, &original); + + // encode + std::vector<unsigned char> encoded; + EXPECT_TRUE(PNGEncoder::Encode(&original[0], PNGEncoder::FORMAT_RGB, w, h, + w * 3, false, &encoded)); + + // decode, it should have the same size as the original + std::vector<unsigned char> decoded; + int outw, outh; + EXPECT_TRUE(PNGDecoder::Decode(&encoded[0], encoded.size(), + PNGDecoder::FORMAT_RGB, &decoded, + &outw, &outh)); + ASSERT_EQ(w, outw); + ASSERT_EQ(h, outh); + ASSERT_EQ(original.size(), decoded.size()); + + // Images must be equal + ASSERT_TRUE(original == decoded); +} + +TEST(PNGCodec, EncodeDecodeRGBA) { + const int w = 20, h = 20; + + // create an image with known values, a must be opaque because it will be + // lost during encoding + std::vector<unsigned char> original; + MakeRGBAImage(w, h, true, &original); + + // encode + std::vector<unsigned char> encoded; + EXPECT_TRUE(PNGEncoder::Encode(&original[0], PNGEncoder::FORMAT_RGBA, w, h, + w * 4, false, &encoded)); + + // decode, it should have the same size as the original + std::vector<unsigned char> decoded; + int outw, outh; + EXPECT_TRUE(PNGDecoder::Decode(&encoded[0], encoded.size(), + PNGDecoder::FORMAT_RGBA, &decoded, + &outw, &outh)); + ASSERT_EQ(w, outw); + ASSERT_EQ(h, outh); + ASSERT_EQ(original.size(), decoded.size()); + + // Images must be exactly equal + ASSERT_TRUE(original == decoded); +} + +// Test that corrupted data decompression causes failures. +TEST(PNGCodec, DecodeCorrupted) { + int w = 20, h = 20; + + // Make 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; + EXPECT_FALSE(PNGDecoder::Decode(&original[0], original.size(), + PNGDecoder::FORMAT_RGB, &output, + &outw, &outh)); + + // Make some compressed data. + std::vector<unsigned char> compressed; + EXPECT_TRUE(PNGEncoder::Encode(&original[0], PNGEncoder::FORMAT_RGB, w, h, + w * 3, false, &compressed)); + + // Try decompressing a truncated version. + EXPECT_FALSE(PNGDecoder::Decode(&compressed[0], compressed.size() / 2, + PNGDecoder::FORMAT_RGB, &output, + &outw, &outh)); + + // Corrupt it and try decompressing that. + for (int i = 10; i < 30; i++) + compressed[i] = i; + EXPECT_FALSE(PNGDecoder::Decode(&compressed[0], compressed.size(), + PNGDecoder::FORMAT_RGB, &output, + &outw, &outh)); +} + +TEST(PNGCodec, EncodeDecodeBGRA) { + const int w = 20, h = 20; + + // Create an image with known values, alpha must be opaque because it will be + // lost during encoding. + std::vector<unsigned char> original; + MakeRGBAImage(w, h, true, &original); + + // Encode. + std::vector<unsigned char> encoded; + EXPECT_TRUE(PNGEncoder::Encode(&original[0], PNGEncoder::FORMAT_BGRA, w, h, + w * 4, false, &encoded)); + + // Decode, it should have the same size as the original. + std::vector<unsigned char> decoded; + int outw, outh; + EXPECT_TRUE(PNGDecoder::Decode(&encoded[0], encoded.size(), + PNGDecoder::FORMAT_BGRA, &decoded, + &outw, &outh)); + ASSERT_EQ(w, outw); + ASSERT_EQ(h, outh); + ASSERT_EQ(original.size(), decoded.size()); + + // Images must be exactly equal. + ASSERT_TRUE(original == decoded); +} + +TEST(PNGCodec, StripAddAlpha) { + const int w = 20, h = 20; + + // These should be the same except one has a 0xff alpha channel. + std::vector<unsigned char> original_rgb; + MakeRGBImage(w, h, &original_rgb); + std::vector<unsigned char> original_rgba; + MakeRGBAImage(w, h, false, &original_rgba); + + // Encode RGBA data as RGB. + std::vector<unsigned char> encoded; + EXPECT_TRUE(PNGEncoder::Encode(&original_rgba[0], PNGEncoder::FORMAT_RGBA, w, h, + w * 4, true, &encoded)); + + // Decode the RGB to RGBA. + std::vector<unsigned char> decoded; + int outw, outh; + EXPECT_TRUE(PNGDecoder::Decode(&encoded[0], encoded.size(), + PNGDecoder::FORMAT_RGBA, &decoded, + &outw, &outh)); + + // Decoded and reference should be the same (opaque alpha). + ASSERT_EQ(w, outw); + ASSERT_EQ(h, outh); + ASSERT_EQ(original_rgba.size(), decoded.size()); + ASSERT_TRUE(original_rgba == decoded); + + // Encode RGBA to RGBA. + EXPECT_TRUE(PNGEncoder::Encode(&original_rgba[0], PNGEncoder::FORMAT_RGBA, w, h, + w * 4, false, &encoded)); + + // Decode the RGBA to RGB. + EXPECT_TRUE(PNGDecoder::Decode(&encoded[0], encoded.size(), + PNGDecoder::FORMAT_RGB, &decoded, + &outw, &outh)); + + // It should be the same as our non-alpha-channel reference. + ASSERT_EQ(w, outw); + ASSERT_EQ(h, outh); + ASSERT_EQ(original_rgb.size(), decoded.size()); + ASSERT_TRUE(original_rgb == decoded); +} |