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sw_engine: allow the stroke clipper

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clipping with a stroke is useful for various visual effects.
TVG can support this approach as it offers better efficiency
compared to alpha masking.

If a valid stroke is defined in the clipper shape,
the renderer prioritizes clipping with the stroke over
 the shape's fill.

issue: https://github.com/thorvg/thorvg/issues/3063
This commit is contained in:
Hermet Park 2024-12-19 14:30:31 +09:00 • committed by Hermet Park
parent 0f253aac27
commit 324bff30d1
2 changed files with 5 additions and 11 deletions
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12
src/renderer/sw_engine/tvgSwRenderer.cpp
View file

@ -88,14 +88,14 @@ struct SwShapeTask : SwTask
return strokeWidth < 2.0f || rshape->stroke->dashCnt > 0 || rshape->stroke->strokeFirst || rshape->strokeTrim() || rshape->stroke->color.a < 255;
}
float validStrokeWidth()
float validStrokeWidth(bool clipper)
{
if (!rshape->stroke) return 0.0f;
auto width = rshape->stroke->width;
if (tvg::zero(width)) return 0.0f;
if (!rshape->stroke->fill && (MULTIPLY(rshape->stroke->color.a, opacity) == 0)) return 0.0f;
if (!clipper && (!rshape->stroke->fill && (MULTIPLY(rshape->stroke->color.a, opacity) == 0))) return 0.0f;
if (tvg::zero(rshape->stroke->trim.begin - rshape->stroke->trim.end)) return 0.0f;
return (width * sqrt(transform.e11 * transform.e11 + transform.e12 * transform.e12));
@ -103,8 +103,9 @@ struct SwShapeTask : SwTask
bool clip(SwRle* target) override
{
if (shape.strokeRle) return rleClip(target, shape.strokeRle);
if (shape.fastTrack) return rleClip(target, &bbox);
else if (shape.rle) return rleClip(target, shape.rle);
if (shape.rle) return rleClip(target, shape.rle);
return false;
}
@ -116,7 +117,7 @@ struct SwShapeTask : SwTask
return;
}
auto strokeWidth = validStrokeWidth();
auto strokeWidth = validStrokeWidth(clipper);
SwBBox renderRegion{};
auto visibleFill = false;
@ -154,14 +155,11 @@ struct SwShapeTask : SwTask
if (flags & (RenderUpdateFlag::Path | RenderUpdateFlag::Stroke | RenderUpdateFlag::Transform)) {
if (strokeWidth > 0.0f) {
shapeResetStroke(&shape, rshape, transform);
if (!shapeGenStrokeRle(&shape, rshape, transform, bbox, renderRegion, mpool, tid)) goto err;
if (auto fill = rshape->strokeFill()) {
auto ctable = (flags & RenderUpdateFlag::GradientStroke) ? true : false;
if (ctable) shapeResetStrokeFill(&shape);
if (!shapeGenStrokeFillColors(&shape, fill, transform, surface, opacity, ctable)) goto err;
} else {
shapeDelStrokeFill(&shape);
}
} else {
shapeDelStroke(&shape);

4
src/renderer/sw_engine/tvgSwShape.cpp
View file

@ -511,10 +511,6 @@ bool shapePrepared(const SwShape* shape)
bool shapeGenRle(SwShape* shape, TVG_UNUSED const RenderShape* rshape, bool antiAlias)
{
//FIXME: Should we draw it?
//Case: Stroke Line
//if (shape.outline->opened) return true;
//Case A: Fast Track Rectangle Drawing
if (shape->fastTrack) return true;