mirrors/ladybird
0
0
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird.git synced 2025-08-22 10:19:20 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 9

LibGfx/JPEG: Write quantization tables in the zigzag ordering

Browse source 
This is clearly something I missed during the first implementation. The
specification is crystal clear about it: "The quantization elements
shall be specified in zig-zag scan order."

This patch fixes the weird behavior we had when using the quantization
table.
This commit is contained in:
Lucas CHOLLET 2023-07-01 23:56:23 -04:00 • committed by Jelle Raaijmakers
commit 05c8ad4e91
Notes: sideshowbarker 2024-07-18 05:37:06 +09:00
1 changed files with 2 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

4
Userland/Libraries/LibGfx/ImageFormats/JPEGWriter.cpp
View file

@ -398,8 +398,8 @@ ErrorOr<void> add_quantization_table(Stream& stream, QuantizationTable const& ta
// Pq and Tq
TRY(stream.write_value<u8>((0 << 4) | table.id));
for (auto coefficient : table.table)
TRY(stream.write_value<u8>(coefficient));
for (u8 i = 0; i < 64; ++i)
TRY(stream.write_value<u8>(table.table[zigzag_map[i]]));
return {};
}