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LibGfx/TIFF: Modify the image according to the Orientation tag

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Let's use the already existing logic (ExifOrientedBitmap) to modify the
bitmap to honor the orientation tag.
This commit is contained in:
Lucas CHOLLET 2024-01-07 00:20:40 -05:00 committed by Andreas Kling
parent 367882ae23
commit 335097e446
Notes: sideshowbarker 2024-07-17 22:09:47 +09:00 
Author: https://github.com/LucasChollet
Commit: https://github.com/SerenityOS/serenity/commit/335097e446
Pull-request: https://github.com/SerenityOS/serenity/pull/22637
Reviewed-by: https://github.com/nico ✅
3 changed files with 20 additions and 4 deletions
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13
Tests/LibGfx/TestImageDecoder.cpp
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@ -546,6 +546,19 @@ TEST_CASE(test_tiff_deflate)
EXPECT_EQ(frame.image->get_pixel(60, 75), Gfx::Color::NamedColor::Red);
}
TEST_CASE(test_tiff_orientation)
{
auto file = MUST(Core::MappedFile::map(TEST_INPUT("tiff/orientation.tiff"sv)));
EXPECT(Gfx::TIFFImageDecoderPlugin::sniff(file->bytes()));
auto plugin_decoder = TRY_OR_FAIL(Gfx::TIFFImageDecoderPlugin::create(file->bytes()));
auto frame = TRY_OR_FAIL(expect_single_frame_of_size(*plugin_decoder, { 300, 400 }));
// Orientation is Rotate90Clockwise
EXPECT_EQ(frame.image->get_pixel(0, 0), Gfx::Color::NamedColor::White);
EXPECT_EQ(frame.image->get_pixel(300 - 75, 60), Gfx::Color::NamedColor::Red);
}
TEST_CASE(test_tiff_packed_bits)
{
auto file = MUST(Core::MappedFile::map(TEST_INPUT("tiff/packed_bits.tiff"sv)));

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Tests/LibGfx/test-inputs/tiff/orientation.tiff Normal file
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11
Userland/Libraries/LibGfx/ImageFormats/TIFFLoader.cpp
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@ -13,6 +13,7 @@
#include <LibCompress/PackBitsDecoder.h>
#include <LibCompress/Zlib.h>
#include <LibGfx/ImageFormats/CCITTDecoder.h>
#include <LibGfx/ImageFormats/ExifOrientedBitmap.h>
#include <LibGfx/ImageFormats/TIFFMetadata.h>
namespace Gfx {
@ -69,7 +70,7 @@ public:
IntSize size() const
{
return { *m_metadata.image_width(), *m_metadata.image_height() };
return ExifOrientedBitmap::oriented_size({ *m_metadata.image_width(), *m_metadata.image_height() }, *m_metadata.orientation());
}
Metadata const& metadata() const
@ -207,6 +208,8 @@ private:
auto const strips_offset = *m_metadata.strip_offsets();
auto const strip_byte_counts = *m_metadata.strip_byte_counts();
auto oriented_bitmap = TRY(ExifOrientedBitmap::create(BitmapFormat::BGRA8888, { *metadata().image_width(), *metadata().image_height() }, *metadata().orientation()));
for (u32 strip_index = 0; strip_index < strips_offset.size(); ++strip_index) {
TRY(m_stream->seek(strips_offset[strip_index]));
@ -231,20 +234,20 @@ private:
}
last_color = color;
m_bitmap->set_pixel(column, scanline, color);
oriented_bitmap.set_pixel(column, scanline, color);
}
decoded_stream->align_to_byte_boundary();
}
}
m_bitmap = oriented_bitmap.bitmap();
return {};
}
ErrorOr<void> decode_frame_impl()
{
m_bitmap = TRY(Bitmap::create(BitmapFormat::BGRA8888, size()));
switch (*m_metadata.compression()) {
case Compression::NoCompression: {
auto identity = [&](u32 num_bytes) {