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lottie/model: revise the color stop population logic.

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The omitted data must be generated with interpolation.
This change supplements that logic.
This commit is contained in:
Hermet Park 2023-09-22 19:09:30 +09:00 • committed by Hermet Park
parent dc67c405f8
commit dc9e14a20f
1 changed files with 17 additions and 17 deletions
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34
src/loaders/lottie/tvgLottieModel.h
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@ -94,12 +94,9 @@ struct LottieGradient
Fill::ColorStop cs;
//merge color stops
uint32_t cnt = (colorStops.count > alphaCnt) ? colorStops.count : alphaCnt;
for (uint32_t i = 0; i < cnt; ++i) {
//merge color stops.
for (uint32_t i = 0; i < color.input->count; ++i) {
if (cidx == clast || aidx == color.input->count) break;
if ((*color.input)[cidx] == (*color.input)[aidx]) {
cs.offset = (*color.input)[cidx];
cs.r = lroundf((*color.input)[cidx + 1] * 255.0f);
@ -113,18 +110,22 @@ struct LottieGradient
cs.r = lroundf((*color.input)[cidx + 1] * 255.0f);
cs.g = lroundf((*color.input)[cidx + 2] * 255.0f);
cs.b = lroundf((*color.input)[cidx + 3] * 255.0f);
cs.a = (output.count > 0) ? output.last().a : 255;
//generate alpha value
if (output.count > 0) {
auto p = ((*color.input)[cidx] - output.last().offset) / ((*color.input)[aidx] - output.last().offset);
cs.a = mathLerp<uint8_t>(output.last().a, lroundf((*color.input)[aidx + 1] * 255.0f), p);
} else cs.a = 255;
cidx += 4;
} else {
cs.offset = (*color.input)[aidx];
if (output.count > 0) {
cs.r = output.last().r;
cs.g = output.last().g;
cs.b = output.last().b;
} else {
cs.r = cs.g = cs.b = 255;
}
cs.a = lroundf((*color.input)[aidx + 1] * 255.0f);
//generate color value
if (output.count > 0) {
auto p = ((*color.input)[aidx] - output.last().offset) / ((*color.input)[cidx] - output.last().offset);
cs.r = mathLerp<uint8_t>(output.last().r, lroundf((*color.input)[cidx + 1] * 255.0f), p);
cs.g = mathLerp<uint8_t>(output.last().g, lroundf((*color.input)[cidx + 2] * 255.0f), p);
cs.b = mathLerp<uint8_t>(output.last().b, lroundf((*color.input)[cidx + 3] * 255.0f), p);
} else cs.r = cs.g = cs.b = 255;
aidx += 2;
}
output.push(cs);
@ -140,17 +141,16 @@ struct LottieGradient
output.push(cs);
cidx += 4;
}
//alpha remains
while (aidx < color.input->count) {
cs.offset = (*color.input)[aidx];
cs.a = lroundf((*color.input)[aidx + 1] * 255.0f);
if (output.count > 0) {
cs.r = output.last().r;
cs.g = output.last().g;
cs.b = output.last().b;
} else {
cs.r = cs.g = cs.b = 255;
}
cs.a = lroundf((*color.input)[aidx + 1] * 255.0f);
} else cs.r = cs.g = cs.b = 255;
output.push(cs);
aidx += 2;
}