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fix(wuffs): don't premul alpha when loading images

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It seems like the raw data version of the kitty graphics transmit
operation is meant to be unassociated (aka straight) alpha, though I
can't find any definitive documentation either way- but in any case
unassociated alpha is more common in image formats and makes the
handling easier for the rest of it.

Also removed a redundant call to `decode_frame_config`, since it's
called implicitly when we call `decode_frame` right after.
This commit is contained in:
Qwerasd
2025-01-17 13:28:14 -05:00
parent 72d085525b
commit c2da843dfd
2 changed files with 2 additions and 22 deletions
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12
pkg/wuffs/src/jpeg.zig
View File

@ -55,7 +55,7 @@ pub fn decode(alloc: Allocator, data: []const u8) Error!ImageData {
c.wuffs_base__pixel_config__set(
&image_config.pixcfg,
c.WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL,
c.WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL,
c.WUFFS_BASE__PIXEL_SUBSAMPLING__NONE,
width,
height,
@ -95,16 +95,6 @@ pub fn decode(alloc: Allocator, data: []const u8) Error!ImageData {
try check(log, &status);
}
var frame_config: c.wuffs_base__frame_config = undefined;
{
const status = c.wuffs_jpeg__decoder__decode_frame_config(
decoder,
&frame_config,
&source_buffer,
);
try check(log, &status);
}
{
const status = c.wuffs_jpeg__decoder__decode_frame(
decoder,

12
pkg/wuffs/src/png.zig
View File

@ -55,7 +55,7 @@ pub fn decode(alloc: Allocator, data: []const u8) Error!ImageData {
c.wuffs_base__pixel_config__set(
&image_config.pixcfg,
c.WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL,
c.WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL,
c.WUFFS_BASE__PIXEL_SUBSAMPLING__NONE,
width,
height,
@ -95,16 +95,6 @@ pub fn decode(alloc: Allocator, data: []const u8) Error!ImageData {
try check(log, &status);
}
var frame_config: c.wuffs_base__frame_config = undefined;
{
const status = c.wuffs_png__decoder__decode_frame_config(
decoder,
&frame_config,
&source_buffer,
);
try check(log, &status);
}
{
const status = c.wuffs_png__decoder__decode_frame(
decoder,