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gl_engine: support simple hairline stroke rendering

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Reduce alpha if stroke width is too thin to mock hairline rendering
This commit is contained in:
RuiwenTang 2024-07-03 20:53:31 +08:00 • committed by Hermet Park
parent 76f98008e8
commit 9bed64a4e7
3 changed files with 21 additions and 3 deletions
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1
src/renderer/gl_engine/tvgGlGeometry.h
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@ -27,6 +27,7 @@
#include "tvgGlCommon.h"
#include "tvgMath.h"
#define MIN_GL_STROKE_WIDTH 0.5f
#define MVP_MATRIX(w, h) \
float mvp[4*4] = { \

21
src/renderer/gl_engine/tvgGlRenderer.cpp
View file

@ -643,6 +643,14 @@ void GlRenderer::drawPrimitive(GlShape& sdata, uint8_t r, uint8_t g, uint8_t b,
a = MULTIPLY(a, sdata.opacity);
if (flag & RenderUpdateFlag::Stroke) {
float strokeWidth = sdata.rshape->strokeWidth();
if (strokeWidth < MIN_GL_STROKE_WIDTH) {
float alpha = strokeWidth / MIN_GL_STROKE_WIDTH;
a = MULTIPLY(a, static_cast<uint8_t>(alpha * 255));
}
}
// matrix buffer
{
const auto& matrix = sdata.geometry->getTransformMatrix();
@ -800,6 +808,15 @@ void GlRenderer::drawPrimitive(GlShape& sdata, const Fill* fill, RenderUpdateFla
});
}
float alpha = 1.0f;
if (flag & RenderUpdateFlag::GradientStroke) {
float strokeWidth = sdata.rshape->strokeWidth();
if (strokeWidth < MIN_GL_STROKE_WIDTH) {
alpha = strokeWidth / MIN_GL_STROKE_WIDTH;
}
}
// gradient block
{
GlBindingResource gradientBinding{};
@ -820,7 +837,7 @@ void GlRenderer::drawPrimitive(GlShape& sdata, const Fill* fill, RenderUpdateFla
gradientBlock.stopColors[i * 4 + 0] = stops[i].r / 255.f;
gradientBlock.stopColors[i * 4 + 1] = stops[i].g / 255.f;
gradientBlock.stopColors[i * 4 + 2] = stops[i].b / 255.f;
gradientBlock.stopColors[i * 4 + 3] = stops[i].a / 255.f;
gradientBlock.stopColors[i * 4 + 3] = stops[i].a / 255.f * alpha;
nStops++;
}
gradientBlock.nStops[0] = nStops * 1.f;
@ -856,7 +873,7 @@ void GlRenderer::drawPrimitive(GlShape& sdata, const Fill* fill, RenderUpdateFla
gradientBlock.stopColors[i * 4 + 0] = stops[i].r / 255.f;
gradientBlock.stopColors[i * 4 + 1] = stops[i].g / 255.f;
gradientBlock.stopColors[i * 4 + 2] = stops[i].b / 255.f;
gradientBlock.stopColors[i * 4 + 3] = stops[i].a / 255.f;
gradientBlock.stopColors[i * 4 + 3] = stops[i].a / 255.f * alpha;
nStops++;
}
gradientBlock.nStops[0] = nStops * 1.f;

2
src/renderer/gl_engine/tvgGlTessellator.h
View file

@ -148,7 +148,7 @@ private:
Array<float>* mResGlPoints;
Array<uint32_t>* mResIndices;
Matrix mMatrix;
float mStrokeWidth = 1.f;
float mStrokeWidth = MIN_GL_STROKE_WIDTH;
float mMiterLimit = 4.f;
StrokeCap mStrokeCap = StrokeCap::Square;
StrokeJoin mStrokeJoin = StrokeJoin::Bevel;