| // Copyright (c) 2006-2008 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 "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); |
| } |