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Simplify coloring of semi-transparent images.

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This commit is contained in:
John Preston 2022-12-15 19:07:50 +04:00
parent 4ec3aced2e
commit 8649a55727
1 changed files with 9 additions and 13 deletions
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22
ui/image/image_prepare.cpp
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@ -1155,25 +1155,21 @@ QImage Colored(QImage &&image, QColor add) {
}
if (const auto pix = image.bits()) {
const auto ca = int(add.alphaF() * 0xFF);
const auto cr = int(add.redF() * 0xFF);
const auto cg = int(add.greenF() * 0xFF);
const auto cb = int(add.blueF() * 0xFF);
const auto ca = add.alpha();
const auto cr = add.red() * (ca + 1);
const auto cg = add.green() * (ca + 1);
const auto cb = add.blue() * (ca + 1);
const auto ra = (0x100 - ca) * 0x100;
const auto w = image.width();
const auto h = image.height();
const auto add = image.bytesPerLine() - (w * 4);
auto i = index_type();
for (auto y = 0; y != h; ++y) {
for (auto to = i + (w * 4); i != to; i += 4) {
const auto b = pix[i];
const auto g = pix[i + 1];
const auto r = pix[i + 2];
const auto a = pix[i + 3];
const auto aca = a * ca;
pix[i + 0] = uchar(b + ((aca * (cb - b)) >> 16));
pix[i + 1] = uchar(g + ((aca * (cg - g)) >> 16));
pix[i + 2] = uchar(r + ((aca * (cr - r)) >> 16));
pix[i + 3] = uchar(a + ((aca * (0xFF - a)) >> 16));
const auto a = pix[i + 3] + 1;
pix[i + 0] = (ra * pix[i + 0] + a * cb) >> 16;
pix[i + 1] = (ra * pix[i + 1] + a * cg) >> 16;
pix[i + 2] = (ra * pix[i + 2] + a * cr) >> 16;
}
i += add;
}