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channel color for gradient part 1

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very not work
This commit is contained in:
Eknous-P 2025-11-13 18:21:25 +04:00
parent ae4476bd7f
commit 44ec4f70da
4 changed files with 71 additions and 18 deletions
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17
src/gui/gradient.cpp
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@ -109,21 +109,28 @@ void Gradient2D::render() {
if (dist>1) dist=1;
ImU32 shadeColor=ImGui::ColorConvertFloat4ToU32(
// ps: multiplying dist to the color channels fixes old
// mixing, but breaks if the bg is 0. and vice versa (not
// multiplying fixes 0 bg mixing)
ImVec4(
i.color.x*i.color.w*dist,
i.color.y*i.color.w*dist,
i.color.z*i.color.w*dist,
1.0f
1.0f*dist // this idk
)
);
ImU32 origColor=g[j*width+k];
// note: this really breaks the color mixing if theres a background
// and the bitshifts are necessary to avoid overflow (but prob only for alpha)
// this needs to be redone, its a temporary proof-of-concept solution anyway
g[j*width+k]=(
(MIN( 0xff, (origColor&0xff) + (shadeColor&0xff) )) | // R
(MIN( 0xff00, (origColor&0xff00) + (shadeColor&0xff00) )) | // G
(MIN(0xff0000,(origColor&0xff0000)+(shadeColor&0xff0000))) | // B
(origColor&0xff000000) // A
(MIN(0xff,(origColor &0xff)+(shadeColor &0xff)) ) | // R
(MIN(0xff,(origColor>> 8&0xff)+(shadeColor>> 8&0xff))<< 8) | // G
(MIN(0xff,(origColor>>16&0xff)+(shadeColor>>16&0xff))<<16) | // B
(MIN(0xff,(origColor>>24&0xff)+(shadeColor>>24&0xff))<<24) // A
);
// ps 2: replacing this with ImAlphaBlendColors doesnt work
}
}
}