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TestImageWriter: Add a JPEG roundtrip test

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Nico Weber 2024-05-04 21:53:35 -04:00 • committed by Tim Flynn
commit dad4843ee4
Notes: sideshowbarker 2024-07-16 20:44:03 +09:00
1 changed files with 16 additions and 2 deletions
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18
Tests/LibGfx/TestImageWriter.cpp
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@ -8,6 +8,8 @@
#include <LibGfx/Bitmap.h>
#include <LibGfx/ImageFormats/BMPLoader.h>
#include <LibGfx/ImageFormats/BMPWriter.h>
#include <LibGfx/ImageFormats/JPEGLoader.h>
#include <LibGfx/ImageFormats/JPEGWriter.h>
#include <LibGfx/ImageFormats/PNGLoader.h>
#include <LibGfx/ImageFormats/PNGWriter.h>
#include <LibGfx/ImageFormats/QOILoader.h>
@ -36,7 +38,7 @@ static ErrorOr<NonnullRefPtr<Gfx::Bitmap>> expect_single_frame_of_size(Gfx::Imag
}
template<class Writer, class Loader>
static ErrorOr<void> test_roundtrip(Gfx::Bitmap const& bitmap)
static ErrorOr<NonnullRefPtr<Gfx::Bitmap>> get_roundtrip_bitmap(Gfx::Bitmap const& bitmap)
{
ByteBuffer encoded_data;
if constexpr (requires(AllocatingMemoryStream stream) { Writer::encode(stream, bitmap); }) {
@ -48,7 +50,13 @@ static ErrorOr<void> test_roundtrip(Gfx::Bitmap const& bitmap)
}
auto plugin = TRY(Loader::create(encoded_data));
auto decoded = TRY(expect_single_frame_of_size(*plugin, bitmap.size()));
return expect_single_frame_of_size(*plugin, bitmap.size());
}
template<class Writer, class Loader>
static ErrorOr<void> test_roundtrip(Gfx::Bitmap const& bitmap)
{
auto decoded = TRY((get_roundtrip_bitmap<Writer, Loader>(bitmap)));
for (int y = 0; y < bitmap.height(); ++y)
for (int x = 0; x < bitmap.width(); ++x)
@ -89,6 +97,12 @@ TEST_CASE(test_bmp)
TRY_OR_FAIL((test_roundtrip<Gfx::BMPWriter, Gfx::BMPImageDecoderPlugin>(TRY_OR_FAIL(create_test_rgba_bitmap()))));
}
TEST_CASE(test_jpeg)
{
// JPEG is lossy, so the roundtripped bitmap won't match the original bitmap. But it should still have the same size.
(void)TRY_OR_FAIL((get_roundtrip_bitmap<Gfx::JPEGWriter, Gfx::JPEGImageDecoderPlugin>(TRY_OR_FAIL(create_test_rgb_bitmap()))));
}
TEST_CASE(test_png)
{
TRY_OR_FAIL((test_roundtrip<Gfx::PNGWriter, Gfx::PNGImageDecoderPlugin>(TRY_OR_FAIL(create_test_rgb_bitmap()))));