RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-25 23:17:45 +00:00
Code Issues Activity Actions

LibGfx/TIFF: Accept images with a single strip and no RowsPerStrip tag

Browse source 
This tag is required by the specification, but some encoders (at least
Krita) don't write it for images with a single strip.

The test file was generated by opening deflate.tiff in Krita and saving
it with the DEFLATE compression.
This commit is contained in:
Lucas CHOLLET 2024-01-16 00:27:52 -05:00 • committed by Andreas Kling
parent 284e785053
commit c2c7365494
4 changed files with 20 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

10
Userland/Libraries/LibGfx/ImageFormats/TIFFLoader.cpp
View file

@ -75,6 +75,9 @@ public:
if (m_metadata.strip_offsets()->size() != m_metadata.strip_byte_counts()->size())
return Error::from_string_literal("TIFFImageDecoderPlugin: StripsOffset and StripByteCount have different sizes");
if (!m_metadata.rows_per_strip().has_value() && m_metadata.strip_byte_counts()->size() != 1)
return Error::from_string_literal("TIFFImageDecoderPlugin: RowsPerStrip is not provided and impossible to deduce");
if (any_of(*m_metadata.bits_per_sample(), [](auto bit_depth) { return bit_depth == 0 || bit_depth > 32; }))
return Error::from_string_literal("TIFFImageDecoderPlugin: Invalid value in BitsPerSample");
@ -238,19 +241,20 @@ private:
{
auto const strips_offset = *m_metadata.strip_offsets();
auto const strip_byte_counts = *m_metadata.strip_byte_counts();
auto const rows_per_strip = m_metadata.rows_per_strip().value_or(*m_metadata.image_height());
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]));
auto const rows_in_strip = strip_index < strips_offset.size() - 1 ? *m_metadata.rows_per_strip() : *m_metadata.image_height() - *m_metadata.rows_per_strip() * strip_index;
auto const rows_in_strip = strip_index < strips_offset.size() - 1 ? rows_per_strip : *m_metadata.image_height() - rows_per_strip * strip_index;
auto const decoded_bytes = TRY(strip_decoder(strip_byte_counts[strip_index], rows_in_strip));
auto decoded_strip = make<FixedMemoryStream>(decoded_bytes);
auto decoded_stream = make<BigEndianInputBitStream>(move(decoded_strip));
for (u32 row = 0; row < *m_metadata.rows_per_strip(); row++) {
auto const scanline = row + *m_metadata.rows_per_strip() * strip_index;
for (u32 row = 0; row < rows_per_strip; row++) {
auto const scanline = row + rows_per_strip * strip_index;
if (scanline >= *m_metadata.image_height())
break;