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LibGfx/PNG: Read metadata from the eXIf chunk

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The test image comes from this WPT test:
http://wpt.live/png/exif-chunk.html
This commit is contained in:
Lucas CHOLLET 2024-05-22 22:45:22 -04:00 committed by Sam Atkins
parent f28bb90d9b
commit 09f4032eeb
Notes: sideshowbarker 2024-07-16 20:08:14 +09:00 
Author: https://github.com/LucasChollet
Commit: https://github.com/SerenityOS/serenity/commit/09f4032eeb
Pull-request: https://github.com/SerenityOS/serenity/pull/24429
Reviewed-by: https://github.com/AtkinsSJ
Reviewed-by: https://github.com/nico ✅
4 changed files with 33 additions and 0 deletions
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13
Tests/LibGfx/TestImageDecoder.cpp
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@ -25,6 +25,7 @@
#include <LibGfx/ImageFormats/QMArithmeticDecoder.h>
#include <LibGfx/ImageFormats/TGALoader.h>
#include <LibGfx/ImageFormats/TIFFLoader.h>
#include <LibGfx/ImageFormats/TIFFMetadata.h>
#include <LibGfx/ImageFormats/TinyVGLoader.h>
#include <LibGfx/ImageFormats/WebPLoader.h>
#include <LibTest/TestCase.h>
@ -768,6 +769,18 @@ TEST_CASE(test_png)
TRY_OR_FAIL(expect_single_frame(*plugin_decoder));
}
TEST_CASE(test_exif)
{
auto file = TRY_OR_FAIL(Core::MappedFile::map(TEST_INPUT("png/exif.png"sv)));
EXPECT(Gfx::PNGImageDecoderPlugin::sniff(file->bytes()));
auto plugin_decoder = TRY_OR_FAIL(Gfx::PNGImageDecoderPlugin::create(file->bytes()));
TRY_OR_FAIL(expect_single_frame_of_size(*plugin_decoder, { 100, 200 }));
EXPECT(plugin_decoder->metadata().has_value());
auto const& exif_metadata = static_cast<Gfx::ExifMetadata const&>(plugin_decoder->metadata().value());
EXPECT_EQ(*exif_metadata.orientation(), Gfx::TIFF::Orientation::Rotate90Clockwise);
}
TEST_CASE(test_png_malformed_frame)
{
Array test_inputs = {

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Tests/LibGfx/test-inputs/png/exif.png Normal file
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19
Userland/Libraries/LibGfx/ImageFormats/PNGLoader.cpp
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@ -11,6 +11,8 @@
#include <AK/Vector.h>
#include <LibCompress/Zlib.h>
#include <LibGfx/ImageFormats/PNGLoader.h>
#include <LibGfx/ImageFormats/TIFFLoader.h>
#include <LibGfx/ImageFormats/TIFFMetadata.h>
#include <LibGfx/Painter.h>
namespace Gfx {
@ -198,6 +200,8 @@ struct PNGLoadingContext {
Optional<ByteBuffer> decompressed_icc_profile;
Optional<RenderingIntent> sRGB_rendering_intent;
OwnPtr<ExifMetadata> exif_metadata;
Checked<int> compute_row_size_for_width(int width)
{
Checked<int> row_size = width;
@ -1168,6 +1172,12 @@ static ErrorOr<void> process_fdAT(ReadonlyBytes data, PNGLoadingContext& context
return {};
}
static ErrorOr<void> process_eXIf(ReadonlyBytes bytes, PNGLoadingContext& context)
{
context.exif_metadata = TRY(TIFFImageDecoderPlugin::read_exif_metadata(bytes));
return {};
}
static void process_IEND(ReadonlyBytes, PNGLoadingContext& context)
{
// https://www.w3.org/TR/png/#11IEND
@ -1235,6 +1245,8 @@ static ErrorOr<void> process_chunk(Streamer& streamer, PNGLoadingContext& contex
return process_fcTL(chunk_data, context);
if (chunk_type == "fdAT"sv)
return process_fdAT(chunk_data, context);
if (chunk_type == "eXIf"sv)
return process_eXIf(chunk_data, context);
if (chunk_type == "IEND"sv)
process_IEND(chunk_data, context);
return {};
@ -1438,6 +1450,13 @@ ErrorOr<ImageFrameDescriptor> PNGImageDecoderPlugin::frame(size_t index, Optiona
return descriptor;
}
Optional<Metadata const&> PNGImageDecoderPlugin::metadata()
{
if (m_context->exif_metadata)
return *m_context->exif_metadata;
return OptionalNone {};
}
ErrorOr<Optional<ReadonlyBytes>> PNGImageDecoderPlugin::icc_data()
{
if (!decode_png_chunks(*m_context))

1
Userland/Libraries/LibGfx/ImageFormats/PNGLoader.h
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@ -27,6 +27,7 @@ public:
virtual size_t frame_count() override;
virtual size_t first_animated_frame_index() override;
virtual ErrorOr<ImageFrameDescriptor> frame(size_t index, Optional<IntSize> ideal_size = {}) override;
virtual Optional<Metadata const&> metadata() override;
virtual ErrorOr<Optional<ReadonlyBytes>> icc_data() override;
static void unfilter_scanline(PNG::FilterType filter, Bytes scanline_data, ReadonlyBytes previous_scanlines_data, u8 bytes_per_complete_pixel);