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// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "src/decoder/codec.h"
#include "include/astc-codec/astc-codec.h"
#include "src/decoder/test/image_utils.h"
#include <gtest/gtest.h>
#include <string>
namespace astc_codec {
static void PrintTo(FootprintType footprint, std::ostream* os) {
switch (footprint) {
case FootprintType::k4x4: *os << "FootprintType::k4x4"; break;
case FootprintType::k5x4: *os << "FootprintType::k5x4"; break;
case FootprintType::k5x5: *os << "FootprintType::k5x5"; break;
case FootprintType::k6x5: *os << "FootprintType::k6x5"; break;
case FootprintType::k6x6: *os << "FootprintType::k6x6"; break;
case FootprintType::k8x5: *os << "FootprintType::k8x5"; break;
case FootprintType::k8x6: *os << "FootprintType::k8x6"; break;
case FootprintType::k10x5: *os << "FootprintType::k10x5"; break;
case FootprintType::k10x6: *os << "FootprintType::k10x6"; break;
case FootprintType::k8x8: *os << "FootprintType::k8x8"; break;
case FootprintType::k10x8: *os << "FootprintType::k10x8"; break;
case FootprintType::k10x10: *os << "FootprintType::k10x10"; break;
case FootprintType::k12x10: *os << "FootprintType::k12x10"; break;
case FootprintType::k12x12: *os << "FootprintType::k12x12"; break;
default:
*os << "<Unexpected FootprintType "
<< static_cast<uint32_t>(footprint) << ">";
}
}
namespace {
using ::testing::TestWithParam;
using ::testing::ValuesIn;
ImageBuffer LoadGoldenImageWithAlpha(std::string basename) {
const std::string filename =
std::string("src/decoder/testdata/") + basename + ".bmp";
ImageBuffer result;
LoadGoldenBmp(filename, &result);
EXPECT_EQ(result.BytesPerPixel(), 4);
return result;
}
struct ImageTestParams {
std::string image_name;
FootprintType footprint;
size_t width;
size_t height;
};
static void PrintTo(const ImageTestParams& params, std::ostream* os) {
*os << "ImageTestParams(" << params.image_name << ", " << params.width << "x"
<< params.height << ", ";
PrintTo(params.footprint, os);
*os << ")";
}
TEST(CodecTest, InvalidInput) {
const size_t valid_width = 16;
const size_t valid_height = 16;
const size_t valid_stride = valid_width * 4;
const std::vector<uint8_t> data(256);
std::vector<uint8_t> output(valid_width * valid_height * 4);
// Invalid footprint.
EXPECT_FALSE(ASTCDecompressToRGBA(
data.data(), data.size(), valid_width, valid_height,
FootprintType::kCount, output.data(), output.size(), valid_stride));
// Fail for 0 width or height.
EXPECT_FALSE(ASTCDecompressToRGBA(data.data(), data.size(), 0, valid_height,
FootprintType::k4x4, output.data(),
output.size(), valid_stride));
EXPECT_FALSE(ASTCDecompressToRGBA(data.data(), data.size(), valid_width, 0,
FootprintType::k4x4, output.data(),
output.size(), valid_stride));
// Fail for data size that's not a multiple of block size.
EXPECT_FALSE(ASTCDecompressToRGBA(
data.data(), data.size() - 1, valid_width, valid_height,
FootprintType::k4x4, output.data(), output.size(), valid_stride));
// Fail for data size that doesn't match the block count.
EXPECT_FALSE(ASTCDecompressToRGBA(
data.data(), data.size() - 16, valid_width, valid_height,
FootprintType::k4x4, output.data(), output.size(), valid_stride));
// Fail for invalid stride.
EXPECT_FALSE(ASTCDecompressToRGBA(
data.data(), data.size(), valid_width, valid_height, FootprintType::k4x4,
output.data(), output.size(), valid_stride - 1));
// Fail for invalid output size.
EXPECT_FALSE(ASTCDecompressToRGBA(
data.data(), data.size(), valid_width, valid_height, FootprintType::k4x4,
output.data(), output.size() - 1, valid_stride));
}
class CodecTest : public TestWithParam<ImageTestParams> {};
TEST_P(CodecTest, PublicAPI) {
const auto& params = GetParam();
const std::string astc = LoadASTCFile(params.image_name);
ImageBuffer our_decoded_image;
our_decoded_image.Allocate(params.width, params.height, 4);
ASSERT_TRUE(ASTCDecompressToRGBA(
reinterpret_cast<const uint8_t*>(astc.data()), astc.size(), params.width,
params.height, params.footprint, our_decoded_image.Data().data(),
our_decoded_image.DataSize(), our_decoded_image.Stride()));
// Check that the decoded image is *very* similar to the library decoding
// of an ASTC texture. They may not be exact due to differences in how we
// convert a 16-bit float to an 8-bit integer.
ImageBuffer decoded_image = LoadGoldenImageWithAlpha(params.image_name);
CompareSumOfSquaredDifferences(decoded_image, our_decoded_image, 1.0);
}
TEST_P(CodecTest, DecompressToImage) {
const auto& params = GetParam();
std::string error;
std::unique_ptr<ASTCFile> image_file = ASTCFile::LoadFile(
std::string("src/decoder/testdata/") + params.image_name + ".astc",
&error);
ASSERT_TRUE(image_file) << "Failed to load " << params.image_name << ": "
<< error;
ASSERT_TRUE(image_file->GetFootprint());
EXPECT_EQ(params.footprint, image_file->GetFootprint().value().Type());
ImageBuffer our_decoded_image;
our_decoded_image.Allocate(image_file->GetWidth(), image_file->GetHeight(),
4);
ASSERT_TRUE(DecompressToImage(*image_file, our_decoded_image.Data().data(),
our_decoded_image.DataSize(),
our_decoded_image.Stride()));
// Check that the decoded image is *very* similar to the library decoding
// of an ASTC texture. They may not be exact due to differences in how we
// convert a 16-bit float to an 8-bit integer.
ImageBuffer decoded_image = LoadGoldenImageWithAlpha(params.image_name);
CompareSumOfSquaredDifferences(decoded_image, our_decoded_image, 1.0);
}
// Test to make sure that reading out color values from blocks in a real-world
// image isn't terribly wrong, either.
std::vector<ImageTestParams> GetTransparentImageTestParams() {
return {
// image_name astc footprint width height
{ "atlas_small_4x4", FootprintType::k4x4, 256, 256 },
{ "atlas_small_5x5", FootprintType::k5x5, 256, 256 },
{ "atlas_small_6x6", FootprintType::k6x6, 256, 256 },
{ "atlas_small_8x8", FootprintType::k8x8, 256, 256 },
};
}
INSTANTIATE_TEST_CASE_P(Transparent, CodecTest,
ValuesIn(GetTransparentImageTestParams()));
} // namespace
} // namespace astc_codec
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