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LibGfx/TIFF: Introduce a code generator

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This will allow us to generate code that handle and provide easy access
to metadata stored in TIFF's tags. The generator is a Python script, and
it output both TIFFMetadata.h and TIFFTagHandler.cpp files.

The generator will definitely need some update to support all TIFF and
EXIF tags, but that will still be easier than writing everything
ourselves.

Some small modifications are needed in TIFFLoader.cpp to make it
compatible with the new `Metadata` class.
This commit is contained in:
Lucas CHOLLET 2023-11-12 23:59:52 -05:00 • committed by Andrew Kaster
parent 8c65cc185a
commit 9836a9ad0e
5 changed files with 372 additions and 251 deletions
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27
Userland/Libraries/LibGfx/ImageFormats/TIFFLoader.cpp
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@ -52,7 +52,7 @@ public:
IntSize size() const
{
return m_metadata.size;
return { *m_metadata.image_width(), *m_metadata.image_height() };
}
State state() const
@ -74,21 +74,24 @@ private:
template<typename ByteReader>
ErrorOr<void> loop_over_pixels(ByteReader&& byte_reader, Function<ErrorOr<void>(u32)> initializer = {})
{
for (u32 strip_index = 0; strip_index < m_metadata.strip_offsets.size(); ++strip_index) {
TRY(m_stream->seek(m_metadata.strip_offsets[strip_index]));
auto const strips_offset = *m_metadata.strip_offsets();
auto const strip_byte_counts = *m_metadata.strip_byte_counts();
for (u32 strip_index = 0; strip_index < strips_offset.size(); ++strip_index) {
TRY(m_stream->seek(strips_offset[strip_index]));
if (initializer)
TRY(initializer(m_metadata.strip_bytes_count[strip_index]));
for (u32 row = 0; row < m_metadata.rows_per_strip; row++) {
auto const scanline = row + m_metadata.rows_per_strip * strip_index;
if (scanline >= static_cast<u32>(m_metadata.size.height()))
TRY(initializer(strip_byte_counts[strip_index]));
for (u32 row = 0; row < *m_metadata.rows_per_strip(); row++) {
auto const scanline = row + *m_metadata.rows_per_strip() * strip_index;
if (scanline >= *m_metadata.image_height())
break;
Optional<Color> last_color {};
for (u32 column = 0; column < static_cast<u32>(m_metadata.size.width()); ++column) {
for (u32 column = 0; column < *m_metadata.image_width(); ++column) {
auto color = Color { TRY(byte_reader()), TRY(byte_reader()), TRY(byte_reader()) };
if (m_metadata.predictor == Predictor::HorizontalDifferencing && last_color.has_value()) {
if (m_metadata.predictor() == Predictor::HorizontalDifferencing && last_color.has_value()) {
color.set_red(last_color->red() + color.red());
color.set_green(last_color->green() + color.green());
color.set_blue(last_color->blue() + color.blue());
@ -105,9 +108,9 @@ private:
ErrorOr<void> decode_frame_impl()
{
m_bitmap = TRY(Bitmap::create(BitmapFormat::BGRA8888, m_metadata.size));
m_bitmap = TRY(Bitmap::create(BitmapFormat::BGRA8888, size()));
switch (m_metadata.compression) {
switch (*m_metadata.compression()) {
case Compression::NoCompression:
TRY(loop_over_pixels([this]() { return read_value<u8>(); }));
break;
@ -341,7 +344,7 @@ private:
result.empend(T { TRY(read_value<typename T::Type>()), TRY(read_value<typename T::Type>()) });
} else {
for (u32 i = 0; i < count; ++i)
result.empend(TRY(read_value<T>()));
result.empend(typename TypePromoter<T>::Type(TRY(read_value<T>())));
}
return result;
};