tests/gtest/avifscaletest.cc

// Copyright 2023 Google LLC
// SPDX-License-Identifier: BSD-2-Clause

#include <cstdint>
#include <limits>

#include "avif/avif.h"
#include "avif/internal.h"
#include "aviftest_helpers.h"
#include "gtest/gtest.h"

using testing::Combine;
using testing::Values;

namespace libavif {
namespace {

// Used to pass the data folder path to the GoogleTest suites.
const char* data_path = nullptr;

//------------------------------------------------------------------------------

class ScaleTest
    : public testing::TestWithParam<
          std::tuple</*bit_depth=*/int, /*yuv_format=*/avifPixelFormat,
                     /*create_alpha=*/bool>> {};

TEST_P(ScaleTest, Roundtrip) {
  if (avifLibYUVVersion() == 0) {
    GTEST_SKIP() << "libyuv not available, skip test.";
  }

  const int bit_depth = std::get<0>(GetParam());
  const avifPixelFormat yuv_format = std::get<1>(GetParam());
  const bool create_alpha = std::get<2>(GetParam());

  const bool kIgnoreMetadata = true;
  const testutil::AvifImagePtr image =
      testutil::ReadImage(data_path, "paris_exif_xmp_icc.jpg", yuv_format,
                          bit_depth, AVIF_CHROMA_DOWNSAMPLING_BEST_QUALITY,
                          kIgnoreMetadata, kIgnoreMetadata, kIgnoreMetadata);
  ASSERT_NE(image, nullptr);
  if (create_alpha && !image->alphaPlane) {
    // Simulate alpha plane with a view on luma.
    image->alphaPlane = image->yuvPlanes[AVIF_CHAN_Y];
    image->alphaRowBytes = image->yuvRowBytes[AVIF_CHAN_Y];
    image->imageOwnsAlphaPlane = false;
  }

  testutil::AvifImagePtr scaled_image(avifImageCreateEmpty(), avifImageDestroy);
  ASSERT_NE(scaled_image, nullptr);
  ASSERT_EQ(avifImageCopy(scaled_image.get(), image.get(), AVIF_PLANES_ALL),
            AVIF_RESULT_OK);

  const uint32_t scaled_width = static_cast<uint32_t>(image->width * 0.9);
  const uint32_t scaled_height = static_cast<uint32_t>(image->height * 2.14);
  const uint32_t kImageSizeLimit = std::numeric_limits<uint32_t>::max();
  const uint32_t kImageDimensionLimit = std::numeric_limits<uint32_t>::max();
  avifDiagnostics diag;
  avifDiagnosticsClearError(&diag);
  ASSERT_TRUE(avifImageScale(scaled_image.get(), scaled_width, scaled_height,
                             kImageSizeLimit, kImageDimensionLimit, &diag))
      << diag.error;
  EXPECT_EQ(scaled_image->width, scaled_width);
  EXPECT_EQ(scaled_image->height, scaled_height);

  avifDiagnosticsClearError(&diag);
  ASSERT_TRUE(avifImageScale(scaled_image.get(), image->width, image->height,
                             kImageSizeLimit, kImageDimensionLimit, &diag))
      << diag.error;
  EXPECT_EQ(scaled_image->width, image->width);
  EXPECT_EQ(scaled_image->height, image->height);

  const double psnr = testutil::GetPsnr(*image, *scaled_image);
  EXPECT_GT(psnr, 30.0);
  EXPECT_LT(psnr, 45.0);
}

INSTANTIATE_TEST_SUITE_P(
    Some, ScaleTest,
    Combine(/*bit_depth=*/Values(8, 10, 12),
            Values(AVIF_PIXEL_FORMAT_YUV444, AVIF_PIXEL_FORMAT_YUV422,
                   AVIF_PIXEL_FORMAT_YUV420, AVIF_PIXEL_FORMAT_YUV400),
            /*create_alpha=*/Values(true, false)));

//------------------------------------------------------------------------------

}  // namespace
}  // namespace libavif

int main(int argc, char** argv) {
  ::testing::InitGoogleTest(&argc, argv);
  if (argc != 2) {
    std::cerr << "There must be exactly one argument containing the path to "
                 "the test data folder"
              << std::endl;
    return 1;
  }
  libavif::data_path = argv[1];
  return RUN_ALL_TESTS();
}