mirrors/ladybird
0
0
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird.git synced 2025-08-03 14:50:18 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 9

LibGfx/JPEG: Support for images with four components

Browse source 
This patch adds support for properly read images with four components,
basically CMYK or YCCK. However, we still lack color spaces
transformations for this type of image. So, it just postpones failure.
This commit is contained in:
Lucas CHOLLET 2023-03-21 18:23:47 -04:00 • committed by Linus Groh
commit 9cbed7b359
Notes: sideshowbarker 2024-07-16 22:02:00 +09:00
1 changed files with 11 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

16
Userland/Libraries/LibGfx/ImageFormats/JPEGLoader.cpp
View file

@ -115,6 +115,8 @@ struct Macroblock {
i32 cr[64] = { 0 };
i32 b[64];
};
i32 k[64] = { 0 };
};
struct MacroblockMeta {
@ -197,7 +199,7 @@ struct ICCMultiChunkState {
struct Scan {
// B.2.3 - Scan header syntax
Vector<ScanComponent, 3> components;
Vector<ScanComponent, 4> components;
u8 spectral_selection_start {}; // Ss
u8 spectral_selection_end {}; // Se
@ -242,12 +244,12 @@ struct JPEGLoadingContext {
Scan current_scan;
Vector<Component, 3> components;
Vector<Component, 4> components;
RefPtr<Gfx::Bitmap> bitmap;
u16 dc_restart_interval { 0 };
HashMap<u8, HuffmanTableSpec> dc_tables;
HashMap<u8, HuffmanTableSpec> ac_tables;
Array<i32, 3> previous_dc_values {};
Array<i32, 4> previous_dc_values {};
MacroblockMeta mblock_meta;
OwnPtr<FixedMemoryStream> stream;
@ -316,8 +318,12 @@ static inline i32* get_component(Macroblock& block, unsigned component)
return block.y;
case 1:
return block.cb;
default:
case 2:
return block.cr;
case 3:
return block.k;
default:
VERIFY_NOT_REACHED();
}
}
@ -1020,7 +1026,7 @@ static ErrorOr<void> read_start_of_frame(Stream& stream, JPEGLoadingContext& con
set_macroblock_metadata(context);
auto component_count = TRY(stream.read_value<u8>());
if (component_count != 1 && component_count != 3) {
if (component_count != 1 && component_count != 3 && component_count != 4) {
dbgln_if(JPEG_DEBUG, "Unsupported number of components in SOF: {}!", component_count);
return Error::from_string_literal("Unsupported number of components in SOF");
}