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lottie: enhanced the colorstop feature.

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Lottie ColorStop RGB / Alpha can be dealt with individually.
Since thorvg handles this one unified set,
lottie model need to merge the data into one structure.
This commit is contained in:
Hermet Park 2023-09-11 23:32:42 +09:00 • committed by Hermet Park
parent e2b7bfc198
commit ec5a32bb73
3 changed files with 96 additions and 29 deletions
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95
src/loaders/lottie/tvgLottieModel.h
View file

@ -82,8 +82,97 @@ struct LottieStroke
struct LottieGradient
{
bool dynamic()
uint32_t populate(ColorStop& color)
{
uint32_t alphaCnt = (color.input->count - (colorStops.count * 4)) / 2;
Array<Fill::ColorStop> output;
output.reserve(colorStops.count + alphaCnt);
uint32_t cidx = 0; //color count
uint32_t clast = colorStops.count * 4;
uint32_t aidx = clast; //alpha count
Fill::ColorStop cs;
//merge color stops
uint32_t cnt = (colorStops.count > alphaCnt) ? colorStops.count : alphaCnt;
for (uint32_t i = 0; i < cnt; ++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);
cs.g = lroundf((*color.input)[cidx + 2] * 255.0f);
cs.b = lroundf((*color.input)[cidx + 3] * 255.0f);
cs.a = lroundf((*color.input)[aidx + 1] * 255.0f);
cidx += 4;
aidx += 2;
} else if ((*color.input)[cidx] < (*color.input)[aidx]) {
cs.offset = (*color.input)[cidx];
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;
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);
aidx += 2;
}
output.push(cs);
}
//color remains
while (cidx < clast) {
cs.offset = (*color.input)[cidx];
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;
output.push(cs);
cidx += 4;
}
//alpha remains
while (aidx < color.input->count) {
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);
output.push(cs);
aidx += 2;
}
color.data = output.data;
output.data = nullptr;
color.input->reset();
delete(color.input);
return output.count;
}
bool prepare()
{
if (colorStops.frames) {
for (auto v = colorStops.frames->data; v < colorStops.frames->end(); ++v) {
colorStops.count = populate(v->value);
}
} else {
colorStops.count = populate(colorStops.value);
}
if (start.frames || end.frames || height.frames || angle.frames || colorStops.frames) return true;
return false;
}
@ -317,7 +406,7 @@ struct LottieGradientFill : LottieObject, LottieGradient
void prepare()
{
LottieObject::type = LottieObject::GradientFill;
if (LottieGradient::dynamic()) statical = false;
if (LottieGradient::prepare()) statical = false;
}
FillRule rule = FillRule::Winding;
@ -329,7 +418,7 @@ struct LottieGradientStroke : LottieObject, LottieStroke, LottieGradient
void prepare()
{
LottieObject::type = LottieObject::GradientStroke;
if (LottieStroke::dynamic() || LottieGradient::dynamic()) statical = false;
if (LottieGradient::prepare() || LottieStroke::dynamic()) statical = false;
}
};

29
src/loaders/lottie/tvgLottieParser.cpp
View file

@ -219,33 +219,10 @@ void LottieParser::getValue(ColorStop& color)
{
if (peekType() == kArrayType) enterArray();
int idx = 0;
auto count = context->gradient->colorStops.count;
if (!color.data) color.data = static_cast<Fill::ColorStop*>(malloc(sizeof(Fill::ColorStop) * count));
color.input = new Array<float>;
color.input->reserve(context->gradient->colorStops.count);
//rgb
while (nextArrayValue()) {
auto remains = (idx % 4);
if (remains == 0) {
color.data[idx / 4].offset = getFloat();
color.data[idx / 4].a = 255; //in default
} else if (remains == 1) {
color.data[idx / 4].r = lroundf(getFloat() * 255.0f);
} else if (remains == 2) {
color.data[idx / 4].g = lroundf(getFloat() * 255.0f);
} else if (remains == 3) {
color.data[idx / 4].b = lroundf(getFloat() * 255.0f);
}
if ((++idx / 4) == count) break;
}
//alpha
idx = 0;
while (nextArrayValue()) {
auto offset = getFloat(); //not used for now.
if (!mathEqual(offset, color.data[idx].offset)) TVGERR("LOTTIE", "FIXME: Gradient alpha offset is ignored");
color.data[idx++].a = lroundf(getFloat() * 255.0f);
}
while (nextArrayValue()) color.input->push(getFloat());
}

1
src/loaders/lottie/tvgLottieProperty.h
View file

@ -47,6 +47,7 @@ struct RGB24
struct ColorStop
{
Fill::ColorStop* data = nullptr;
Array<float>* input = nullptr;
};