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lottie/text: Support line spacing

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Compute line spacing based on the text range selector, applying the maximum spacing value for each line.
issue: https://github.com/thorvg/thorvg/issues/2178
This commit is contained in:
Jinny You 2024-09-10 11:44:32 +09:00 • committed by Hermet Park
parent 371139e220
commit bf3e861b5a
3 changed files with 11 additions and 1 deletions
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10
src/loaders/lottie/tvgLottieBuilder.cpp
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@ -1003,6 +1003,8 @@ void LottieBuilder::updateText(LottieLayer* layer, float frameNo)
auto scene = Scene::gen();
int line = 0;
int space = 0;
auto lineSpacing = 0.0f;
auto totalLineSpacing = 0.0f;
//text string
int idx = 0;
@ -1028,10 +1030,13 @@ void LottieBuilder::updateText(LottieLayer* layer, float frameNo)
if (*p == '\0') break;
++p;
totalLineSpacing += lineSpacing;
lineSpacing = 0.0f;
//new text group, single scene for each line
scene = Scene::gen();
cursor.x = 0.0f;
cursor.y = ++line * (doc.height / scale);
cursor.y = (++line * doc.height + totalLineSpacing) / scale;
continue;
}
@ -1100,6 +1105,9 @@ void LottieBuilder::updateText(LottieLayer* layer, float frameNo)
shape->stroke(strokeColor.rgb[0], strokeColor.rgb[1], strokeColor.rgb[2], (*s)->style.strokeOpacity(frameNo));
}
cursor.x += (*s)->style.letterSpacing(frameNo);
auto spacing = (*s)->style.lineSpacing(frameNo);
if (spacing > lineSpacing) lineSpacing = spacing;
}
scene->push(cast(shape));

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

@ -158,6 +158,7 @@ struct LottieTextStyle
LottiePosition position = Point{0, 0};
LottiePoint scale = Point{100, 100};
LottieFloat letterSpacing = 0.0f;
LottieFloat lineSpacing = 0.0f;
LottieFloat strokeWidth = 0.0f;
LottieFloat rotation = 0.0f;
LottieOpacity fillOpacity = 255;

1
src/loaders/lottie/tvgLottieParser.cpp
View file

@ -1136,6 +1136,7 @@ void LottieParser::parseTextRange(LottieText* text)
enterObject();
while (auto key = nextObjectKey()) {
if (KEY_AS("t")) parseProperty<LottieProperty::Type::Float>(selector->style.letterSpacing);
else if (KEY_AS("ls")) parseProperty<LottieProperty::Type::Color>(selector->style.lineSpacing);
else if (KEY_AS("fc")) parseProperty<LottieProperty::Type::Color>(selector->style.fillColor);
else if (KEY_AS("fo")) parseProperty<LottieProperty::Type::Color>(selector->style.fillOpacity);
else if (KEY_AS("sw")) parseProperty<LottieProperty::Type::Float>(selector->style.strokeWidth);