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LibGfx/WebPWriter: Write VP8X chunk header and bytes at once

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For VP8L it arguably makes sense to separate the two, but for
fixed-size chunk like VP8X it doesn't.

No behavior change.
This commit is contained in:
Nico Weber 2024-05-08 17:47:21 -04:00 • committed by Tim Flynn
commit 27cc9e7386
Notes: sideshowbarker 2024-07-17 04:01:41 +09:00
1 changed files with 4 additions and 7 deletions
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11
Userland/Libraries/LibGfx/ImageFormats/WebPWriter.cpp
View file

@ -200,7 +200,7 @@ struct VP8XHeader {
};
// https://developers.google.com/speed/webp/docs/riff_container#extended_file_format
static ErrorOr<void> write_VP8X_header(Stream& stream, VP8XHeader const& header)
static ErrorOr<void> write_VP8X_chunk(Stream& stream, VP8XHeader const& header)
{
if (header.width > (1 << 24) || header.height > (1 << 24))
return Error::from_string_literal("WebP dimensions too large for VP8X chunk");
@ -213,6 +213,8 @@ static ErrorOr<void> write_VP8X_header(Stream& stream, VP8XHeader const& header)
if (product >= (1ull << 32))
return Error::from_string_literal("WebP dimensions too large for VP8X chunk");
TRY(write_chunk_header(stream, "VP8X"sv, 10));
LittleEndianOutputBitStream bit_stream { MaybeOwned<Stream>(stream) };
// Don't use bit_stream.write_bits() to write individual flags here:
@ -311,13 +313,8 @@ ErrorOr<void> WebPWriter::encode(Stream& stream, Bitmap const& bitmap, Options c
TRY(align_to_two(iccp_chunk_stream));
iccp_chunk_bytes = TRY(iccp_chunk_stream.read_until_eof());
AllocatingMemoryStream vp8x_header_stream;
TRY(write_VP8X_header(vp8x_header_stream, { .has_icc = true, .has_alpha = alpha_is_used_hint, .width = (u32)bitmap.width(), .height = (u32)bitmap.height() }));
auto vp8x_header_bytes = TRY(vp8x_header_stream.read_until_eof());
AllocatingMemoryStream vp8x_chunk_stream;
TRY(write_chunk_header(vp8x_chunk_stream, "VP8X"sv, vp8x_header_bytes.size()));
TRY(vp8x_chunk_stream.write_until_depleted(vp8x_header_bytes));
TRY(write_VP8X_chunk(vp8x_chunk_stream, { .has_icc = true, .has_alpha = alpha_is_used_hint, .width = (u32)bitmap.width(), .height = (u32)bitmap.height() }));
VERIFY(vp8x_chunk_stream.used_buffer_size() % 2 == 0);
vp8x_chunk_bytes = TRY(vp8x_chunk_stream.read_until_eof());
}