wuggy/Dactyloidae
wuggy/Dactyloidae
1
0
Fork 0
mirror of https://repo.dactyloidae.xyz/Dactyloidae/UXP.git synced 2026-09-04 23:08:39 +09:00
Code Issues Projects Releases Packages Wiki Activity

Issue #2040 - Pre-multiply the alpha values in our JXL decode buffer.

Browse source 
Using selective calculation (only if not opaque) and fast integer
math here should optimize well in compilers.
This commit is contained in:
Moonchild 2022-11-30 11:32:44 +00:00 • committed by roytam1
commit 9b4c0ef4e9
1 changed files with 6 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

6
image/decoders/nsJXLDecoder.cpp
View file

@ -145,6 +145,12 @@ nsJXLDecoder::ReadJXLData(const char* aData, size_t aLength)
// We currently have a channel ordering mis-match here.
for (uint8_t* pixPtr = rowPtr; pixPtr < rowPtr + mInfo.xsize * 4; pixPtr+=4){
std::swap(pixPtr[0], pixPtr[2]);
// Pre-multiply, too
if (pixPtr[3] < 255) {
pixPtr[0]=((uint16_t)pixPtr[0]*(uint16_t)pixPtr[3]) >> 8;
pixPtr[1]=((uint16_t)pixPtr[1]*(uint16_t)pixPtr[3]) >> 8;
pixPtr[2]=((uint16_t)pixPtr[2]*(uint16_t)pixPtr[3]) >> 8;
}
}
pipe->WriteBuffer(reinterpret_cast<uint32_t*>(rowPtr));
}