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LibGfx/WebPWriter: Extract another align_to_two() helper

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Nico Weber 2024-05-14 19:04:24 -04:00 • committed by Andreas Kling
commit 33acd4e747
Notes: sideshowbarker 2024-07-17 22:09:47 +09:00
1 changed files with 12 additions and 10 deletions
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22
Userland/Libraries/LibGfx/ImageFormats/WebPWriter.cpp
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@ -198,6 +198,16 @@ static ErrorOr<ByteBuffer> compress_VP8L_image_data(Bitmap const& bitmap)
return vp8l_data_stream.read_until_eof();
}
// FIXME: Consider using LibRIFF for RIFF writing details. (It currently has no writing support.)
static ErrorOr<void> align_to_two(Stream& stream, size_t number_of_bytes_written)
{
// https://developers.google.com/speed/webp/docs/riff_container
// "If Chunk Size is odd, a single padding byte -- which MUST be 0 to conform with RIFF -- is added."
if (number_of_bytes_written % 2 != 0)
TRY(stream.write_value<u8>(0));
return {};
}
static u8 vp8x_flags_from_header(VP8XHeader const& header)
{
u8 flags = 0;
@ -279,11 +289,7 @@ static ErrorOr<void> write_VP8X_chunk(Stream& stream, VP8XHeader const& header)
// FIXME: Consider using LibRIFF for RIFF writing details. (It currently has no writing support.)
static ErrorOr<void> align_to_two(AllocatingMemoryStream& stream)
{
// https://developers.google.com/speed/webp/docs/riff_container
// "If Chunk Size is odd, a single padding byte -- which MUST be 0 to conform with RIFF -- is added."
if (stream.used_buffer_size() % 2 != 0)
TRY(stream.write_value<u8>(0));
return {};
return align_to_two(stream, stream.used_buffer_size());
}
ErrorOr<void> WebPWriter::encode(Stream& stream, Bitmap const& bitmap, Options const& options)
@ -352,11 +358,7 @@ private:
static ErrorOr<void> align_to_two(SeekableStream& stream)
{
// https://developers.google.com/speed/webp/docs/riff_container
// "If Chunk Size is odd, a single padding byte -- which MUST be 0 to conform with RIFF -- is added."
if (TRY(stream.tell()) % 2 != 0)
TRY(stream.write_value<u8>(0));
return {};
return align_to_two(stream, TRY(stream.tell()));
}
static ErrorOr<void> write_ANMF_chunk(Stream& stream, ANMFChunk const& chunk)