gl_engine: optimize tessellation performance

* restrict the scissor box of composite task
* do not tessellate stroke or fill geometry if there is no Fill or
  Stroke color
* use actually transformed curve to calculate polyline count when doing
  curve flatten

src/renderer/gl_engine/tvgGlCommon.h

@@ -93,5 +93,11 @@ struct GlRadialGradientBlock
     alignas(16) float stopColors[4 * MAX_GRADIENT_STOPS] = {};
 };
 
+struct GlCompositor : public Compositor
+{
+    RenderRegion bbox = {};
+
+    GlCompositor(const RenderRegion& box) : bbox(box) {}
+};
 
 #endif /* _TVG_GL_COMMON_H_ */

src/renderer/gl_engine/tvgGlGeometry.cpp

@@ -38,17 +38,21 @@ bool GlGeometry::tesselate(const RenderShape& rshape, RenderUpdateFlag flag)
 
         BWTessellator bwTess{&fillVertex, &fillIndex};
 
-        bwTess.tessellate(&rshape);
+        bwTess.tessellate(&rshape, mMatrix);
 
         mFillRule = rshape.rule;
+
+        mBounds = bwTess.bounds();
     }
 
     if (flag & (RenderUpdateFlag::Stroke | RenderUpdateFlag::Transform)) {
         strokeVertex.clear();
         strokeIndex.clear();
 
-        Stroker stroke{&strokeVertex, &strokeIndex};
+        Stroker stroke{&strokeVertex, &strokeIndex, mMatrix};
         stroke.stroke(&rshape);
+
+        mBounds = stroke.bounds();
     }
 
     return true;
@@ -90,6 +94,32 @@ bool GlGeometry::tesselate(const Surface* image, const RenderMesh* mesh, RenderU
                 index += 3;
             }
 
+            float left = mesh->triangles[0].vertex[0].pt.x;
+            float top = mesh->triangles[0].vertex[0].pt.y;
+            float right = mesh->triangles[0].vertex[0].pt.x;
+            float bottom = mesh->triangles[0].vertex[0].pt.y;
+
+            for (uint32_t i = 0; i < mesh->triangleCnt; i++) {
+                left = min(left, mesh->triangles[i].vertex[0].pt.x);
+                left = min(left, mesh->triangles[i].vertex[1].pt.x);
+                left = min(left, mesh->triangles[i].vertex[2].pt.x);
+                top = min(top, mesh->triangles[i].vertex[0].pt.y);
+                top = min(top, mesh->triangles[i].vertex[1].pt.y);
+                top = min(top, mesh->triangles[i].vertex[2].pt.y);
+
+                right = max(right, mesh->triangles[i].vertex[0].pt.x);
+                right = max(right, mesh->triangles[i].vertex[1].pt.x);
+                right = max(right, mesh->triangles[i].vertex[2].pt.x);
+                bottom = max(bottom, mesh->triangles[i].vertex[0].pt.y);
+                bottom = max(bottom, mesh->triangles[i].vertex[1].pt.y);
+                bottom = max(bottom, mesh->triangles[i].vertex[2].pt.y);
+            }
+
+            mBounds.x = static_cast<int32_t>(left);
+            mBounds.y = static_cast<int32_t>(top);
+            mBounds.w = static_cast<int32_t>(right - left);
+            mBounds.h = static_cast<int32_t>(bottom - top);
+
         } else {
             fillVertex.reserve(5 * 4);
             fillIndex.reserve(6);
@@ -131,6 +161,11 @@ bool GlGeometry::tesselate(const Surface* image, const RenderMesh* mesh, RenderU
             fillIndex.push(2);
             fillIndex.push(1);
             fillIndex.push(3);
+
+            mBounds.x = 0;
+            mBounds.y = 0;
+            mBounds.w = image->w;
+            mBounds.h = image->h;
         }
     }
 
@@ -186,12 +221,15 @@ void GlGeometry::updateTransform(const RenderTransform* transform, float w, floa
     float modelMatrix[16];
     if (transform) {
         GET_MATRIX44(transform->m, modelMatrix);
+        mMatrix = transform->m;
     } else {
         memset(modelMatrix, 0, 16 * sizeof(float));
         modelMatrix[0] = 1.f;
         modelMatrix[5] = 1.f;
         modelMatrix[10] = 1.f;
         modelMatrix[15] = 1.f;
+
+        mMatrix = Matrix{1, 0, 0, 0, 1, 0, 0, 0, 1};
     }
 
     MVP_MATRIX();
@@ -219,3 +257,37 @@ GlStencilMode GlGeometry::getStencilMode(RenderUpdateFlag flag)
 
     return GlStencilMode::None;
 }
+
+RenderRegion GlGeometry::getBounds() const
+{
+    if (mathIdentity(&mMatrix)) {
+        return mBounds;
+    } else {
+        Point lt{static_cast<float>(mBounds.x), static_cast<float>(mBounds.y)};
+        Point lb{static_cast<float>(mBounds.x), static_cast<float>(mBounds.y + mBounds.h)};
+        Point rt{static_cast<float>(mBounds.x + mBounds.w), static_cast<float>(mBounds.y)};
+        Point rb{static_cast<float>(mBounds.x + mBounds.w), static_cast<float>(mBounds.y + mBounds.h)};
+
+        mathMultiply(&lt, &mMatrix);
+        mathMultiply(&lb, &mMatrix);
+        mathMultiply(&rt, &mMatrix);
+        mathMultiply(&rb, &mMatrix);
+
+        float left = min(min(lt.x, lb.x), min(rt.x, rb.x));
+        float top = min(min(lt.y, lb.y), min(rt.y, rb.y));
+        float right = max(max(lt.x, lb.x), max(rt.x, rb.x));
+        float bottom = max(max(lt.y, lb.y), max(rt.y, rb.y));
+
+        auto bounds = RenderRegion {
+            static_cast<int32_t>(left),
+            static_cast<int32_t>(top),
+            static_cast<int32_t>(right - left),
+            static_cast<int32_t>(bottom - top),
+        };
+        if (bounds.x < 0 || bounds.y < 0 || bounds.w < 0 || bounds.h < 0) {
+            return mBounds;
+        } else {
+            return bounds;
+        }
+    }
+}

src/renderer/gl_engine/tvgGlGeometry.h

@@ -196,6 +196,7 @@ public:
     void setViewport(const RenderRegion& viewport);
     float* getTransforMatrix();
     GlStencilMode getStencilMode(RenderUpdateFlag flag);
+    RenderRegion getBounds() const;
 
 private:
     RenderRegion viewport = {};
@@ -204,8 +205,10 @@ private:
     Array<uint32_t> fillIndex = {};
     Array<uint32_t> strokeIndex = {};
     float mTransform[16];
+    Matrix mMatrix = {};
 
     FillRule mFillRule = FillRule::Winding;
+    RenderRegion mBounds = {};
 };
 
 #endif /* _TVG_GL_GEOMETRY_H_ */

src/renderer/gl_engine/tvgGlRenderer.cpp

@@ -133,9 +133,10 @@ bool GlRenderer::sync()
 }
 
 
-RenderRegion GlRenderer::region(TVG_UNUSED RenderData data)
+RenderRegion GlRenderer::region(RenderData data)
 {
-    return {0, 0, static_cast<int32_t>(surface.w), static_cast<int32_t>(surface.h)};
+    auto shape = reinterpret_cast<GlShape*>(data);
+    return shape->geometry->getBounds();
 }
 
 
@@ -158,9 +159,9 @@ bool GlRenderer::postRender()
 }
 
 
-Compositor* GlRenderer::target(TVG_UNUSED const RenderRegion& region, TVG_UNUSED ColorSpace cs)
+Compositor* GlRenderer::target(const RenderRegion& region, TVG_UNUSED ColorSpace cs)
 {
-    mComposeStack.emplace_back(make_unique<tvg::Compositor>());
+    mComposeStack.emplace_back(make_unique<GlCompositor>(region));
     return mComposeStack.back().get();
 }
 
@@ -209,6 +210,9 @@ ColorSpace GlRenderer::colorSpace()
 
 bool GlRenderer::blend(TVG_UNUSED BlendMethod method)
 {
+    if (method != BlendMethod::Normal) {
+        return true;
+    }
     //TODO:
     return false;
 }
@@ -273,6 +277,8 @@ bool GlRenderer::renderShape(RenderData data)
     auto sdata = static_cast<GlShape*>(data);
     if (!sdata) return false;
 
+    if (sdata->updateFlag == RenderUpdateFlag::None) return false;
+
     if (!sdata->clips.empty()) drawClip(sdata->clips);
 
     uint8_t r = 0, g = 0, b = 0, a = 0;
@@ -351,7 +357,7 @@ RenderData GlRenderer::prepare(Surface* image, const RenderMesh* mesh, RenderDat
 
     sdata->viewWd = static_cast<float>(surface.w);
     sdata->viewHt = static_cast<float>(surface.h);
-    sdata->updateFlag = flags;
+    sdata->updateFlag = RenderUpdateFlag::Image;
 
     if (sdata->texId == 0) {
         sdata->texId = _genTexture(image);
@@ -398,9 +404,7 @@ RenderData GlRenderer::prepare(const RenderShape& rshape, RenderData data, const
 
     sdata->viewWd = static_cast<float>(surface.w);
     sdata->viewHt = static_cast<float>(surface.h);
-    sdata->updateFlag = flags;
+    sdata->updateFlag = RenderUpdateFlag::None;
-
-    if (sdata->updateFlag == RenderUpdateFlag::None) return sdata;
 
     sdata->geometry = make_unique<GlGeometry>();
     sdata->opacity = opacity;
@@ -417,6 +421,17 @@ RenderData GlRenderer::prepare(const RenderShape& rshape, RenderData data, const
         return sdata;
     }
 
+    if (clipper) {
+        sdata->updateFlag = RenderUpdateFlag::Path;
+    } else {
+        if (alphaF) sdata->updateFlag = static_cast<RenderUpdateFlag>(RenderUpdateFlag::Color | sdata->updateFlag);
+        if (rshape.fill) sdata->updateFlag = static_cast<RenderUpdateFlag>(RenderUpdateFlag::Gradient | sdata->updateFlag);
+        if (alphaS) sdata->updateFlag = static_cast<RenderUpdateFlag>(RenderUpdateFlag::Stroke | sdata->updateFlag);
+        if (rshape.strokeFill()) sdata->updateFlag = static_cast<RenderUpdateFlag>(RenderUpdateFlag::GradientStroke | sdata->updateFlag);
+    }
+
+    if (sdata->updateFlag == RenderUpdateFlag::None) return sdata;
+
     sdata->geometry->updateTransform(transform, sdata->viewWd, sdata->viewHt);
     sdata->geometry->setViewport(RenderRegion{
         mViewport.x,
@@ -835,7 +850,7 @@ GlRenderPass* GlRenderer::currentPass()
 
 void GlRenderer::prepareBlitTask(GlBlitTask* task)
 {
-    prepareCmpTask(task);
+    prepareCmpTask(task, mViewport);
 
     {
         uint32_t loc = task->getProgram()->getUniformLocation("uSrcTexture");
@@ -843,7 +858,7 @@ void GlRenderer::prepareBlitTask(GlBlitTask* task)
     }
 }
 
-void GlRenderer::prepareCmpTask(GlRenderTask* task)
+void GlRenderer::prepareCmpTask(GlRenderTask* task, const RenderRegion& vp)
 {
     // we use 1:1 blit mapping since compositor fbo is same size as root fbo
     Array<float> vertices(4 * 4);
@@ -891,15 +906,16 @@ void GlRenderer::prepareCmpTask(GlRenderTask* task)
 
     task->setDrawRange(indexOffset, indices.count);
     task->setViewport(RenderRegion{
-        mViewport.x,
+        vp.x,
-        static_cast<int32_t>((surface.h - mViewport.y - mViewport.h)),
+        static_cast<int32_t>((surface.h - vp.y - vp.h)),
-        mViewport.w,
+        vp.w,
-        mViewport.h,
+        vp.h,
     });
 }
 
 void GlRenderer::endRenderPass(Compositor* cmp)
 {
+    auto gl_cmp = static_cast<GlCompositor*>(cmp);
     if (cmp->method != CompositeMethod::None) {
         auto self_pass = std::move(mRenderPassStack.back());
         mRenderPassStack.pop_back();
@@ -949,7 +965,7 @@ void GlRenderer::endRenderPass(Compositor* cmp)
 
         auto compose_task = self_pass.endRenderPass<GlDrawBlitTask>(program, currentPass()->getFboId());
 
-        prepareCmpTask(compose_task);
+        prepareCmpTask(compose_task, gl_cmp->bbox);
 
         {
             uint32_t loc = program->getUniformLocation("uSrcTexture");
@@ -971,7 +987,7 @@ void GlRenderer::endRenderPass(Compositor* cmp)
         auto task = renderPass.endRenderPass<GlDrawBlitTask>(
             mPrograms[RT_Image].get(), currentPass()->getFboId());
 
-        prepareCmpTask(task);
+        prepareCmpTask(task, gl_cmp->bbox);
 
         // matrix buffer
         {

src/renderer/gl_engine/tvgGlRenderer.h

@@ -93,7 +93,7 @@ private:
     GlRenderPass* currentPass();
 
     void prepareBlitTask(GlBlitTask* task);
-    void prepareCmpTask(GlRenderTask* task);
+    void prepareCmpTask(GlRenderTask* task, const RenderRegion& vp);
     void endRenderPass(Compositor* cmp);
 
     GLint mTargetFboId = 0;
@@ -105,7 +105,7 @@ private:
     unique_ptr<GlRenderTarget> mRootTarget = {};
     Array<GlRenderTarget*> mComposePool = {};
     vector<GlRenderPass> mRenderPassStack = {};
-    vector<unique_ptr<Compositor>> mComposeStack = {};
+    vector<unique_ptr<GlCompositor>> mComposeStack = {};
 
     bool mClearBuffer = true;
 };

src/renderer/gl_engine/tvgGlTessellator.cpp

@@ -1638,7 +1638,7 @@ void Tessellator::emitTriangle(detail::Vertex *p1, detail::Vertex *p2, detail::V
 }
 
 
-Stroker::Stroker(Array<float> *points, Array<uint32_t> *indices) : mResGlPoints(points), mResIndices(indices)
+Stroker::Stroker(Array<float> *points, Array<uint32_t> *indices, const Matrix& matrix) : mResGlPoints(points), mResIndices(indices), mMatrix(matrix)
 {
 }
 
@@ -1665,6 +1665,16 @@ void Stroker::stroke(const RenderShape *rshape)
     }
 }
 
+RenderRegion Stroker::bounds() const
+{
+    return RenderRegion {
+        static_cast<int32_t>(mLeftTop.x),
+        static_cast<int32_t>(mLeftTop.y),
+        static_cast<int32_t>(mRightBottom.x - mLeftTop.x),
+        static_cast<int32_t>(mRightBottom.y - mLeftTop.y),
+    };
+}
+
 void Stroker::doStroke(const PathCommand *cmds, uint32_t cmd_count, const Point *pts, uint32_t pts_count)
 {
     mResGlPoints->reserve(pts_count * 4 + 16);
@@ -1773,6 +1783,16 @@ void Stroker::strokeLineTo(const GlPoint &curr)
         mStrokeState.prevPtDir = dir;
         mStrokeState.prevPt = curr;
     }
+
+    if (ia == 0) {
+        mRightBottom.x = mLeftTop.x = curr.x;
+        mRightBottom.y = mLeftTop.y = curr.y;
+    } else {
+        mLeftTop.x = min(mLeftTop.x, curr.x);
+        mLeftTop.y = min(mLeftTop.y, curr.y);
+        mRightBottom.x = max(mRightBottom.x, curr.x);
+        mRightBottom.y = max(mRightBottom.y , curr.y);
+    }
 }
 
 void Stroker::strokeCubicTo(const GlPoint &cnt1, const GlPoint &cnt2, const GlPoint &end)
@@ -1783,7 +1803,13 @@ void Stroker::strokeCubicTo(const GlPoint &cnt1, const GlPoint &cnt2, const GlPo
     curve.ctrl2 = Point{cnt2.x, cnt2.y};
     curve.end = Point{end.x, end.y};
 
-    auto count = detail::_bezierCurveCount(curve);
+    Bezier relCurve {curve.start, curve.ctrl1, curve.ctrl2, curve.end};
+    mathMultiply(&relCurve.start, &mMatrix);
+    mathMultiply(&relCurve.ctrl1, &mMatrix);
+    mathMultiply(&relCurve.ctrl2, &mMatrix);
+    mathMultiply(&relCurve.end, &mMatrix);
+
+    auto count = detail::_bezierCurveCount(relCurve);
 
     float step = 1.f / count;
 
@@ -2110,7 +2136,7 @@ BWTessellator::BWTessellator(Array<float>* points, Array<uint32_t>* indices): mR
 {
 }
 
-void BWTessellator::tessellate(const RenderShape *rshape)
+void BWTessellator::tessellate(const RenderShape *rshape, const Matrix& matrix)
 {
     auto cmds = rshape->path.cmds.data;
     auto cmdCnt = rshape->path.cmds.count;
@@ -2148,7 +2174,13 @@ void BWTessellator::tessellate(const RenderShape *rshape)
             case PathCommand::CubicTo: {
                 Bezier curve{pts[-1], pts[0], pts[1], pts[2]};
 
-                auto stepCount = detail::_bezierCurveCount(curve);
+                Bezier relCurve {pts[-1], pts[0], pts[1], pts[2]};
+                mathMultiply(&relCurve.start, &matrix);
+                mathMultiply(&relCurve.ctrl1, &matrix);
+                mathMultiply(&relCurve.ctrl2, &matrix);
+                mathMultiply(&relCurve.end, &matrix);
+
+                auto stepCount = detail::_bezierCurveCount(relCurve);
 
                 if (stepCount <= 1) stepCount = 2;
 
@@ -2176,9 +2208,31 @@ void BWTessellator::tessellate(const RenderShape *rshape)
     }
 }
 
+RenderRegion BWTessellator::bounds() const
+{
+    return RenderRegion {
+        static_cast<int32_t>(mLeftTop.x),
+        static_cast<int32_t>(mLeftTop.y),
+        static_cast<int32_t>(mRightBottom.x - mLeftTop.x),
+        static_cast<int32_t>(mRightBottom.y - mLeftTop.y),
+    };
+}
+
 uint32_t BWTessellator::pushVertex(float x, float y)
 {
-    return detail::_pushVertex(mResPoints, x, y);
+    auto index = detail::_pushVertex(mResPoints, x, y);
+
+    if (index == 0) {
+        mRightBottom.x = mLeftTop.x = x;
+        mRightBottom.y = mLeftTop.y = y;
+    } else {
+        mLeftTop.x = min(mLeftTop.x, x);
+        mLeftTop.y = min(mLeftTop.y, y);
+        mRightBottom.x = max(mRightBottom.x, x);
+        mRightBottom.y = max(mRightBottom.y , y);
+    }
+
+    return index;
 }
 
 void BWTessellator::pushTriangle(uint32_t a, uint32_t b, uint32_t c)

src/renderer/gl_engine/tvgGlTessellator.h

@@ -108,11 +108,13 @@ class Stroker final
         bool hasMove = false;
     };
 public:
-    Stroker(Array<float>* points, Array<uint32_t>* indices);
+    Stroker(Array<float>* points, Array<uint32_t>* indices, const Matrix& matrix);
     ~Stroker() = default;
 
     void stroke(const RenderShape *rshape);
 
+    RenderRegion bounds() const;
+
 private:
     void doStroke(const PathCommand* cmds, uint32_t cmd_count, const Point* pts, uint32_t pts_count);
     void doDashStroke(const PathCommand* cmds, uint32_t cmd_count, const Point* pts, uint32_t pts_count,
@@ -141,11 +143,14 @@ private:
 private:
     Array<float>* mResGlPoints;
     Array<uint32_t>* mResIndices;
+    Matrix mMatrix;
     float mStrokeWidth = 1.f;
     float mMiterLimit = 4.f;
     StrokeCap mStrokeCap = StrokeCap::Square;
     StrokeJoin mStrokeJoin = StrokeJoin::Bevel;
     State mStrokeState = {};
+    GlPoint mLeftTop = {};
+    GlPoint mRightBottom = {};
 };
 
 class DashStroke
@@ -183,7 +188,9 @@ public:
     BWTessellator(Array<float>* points, Array<uint32_t>* indices);
     ~BWTessellator() = default;
 
-    void tessellate(const RenderShape *rshape);
+    void tessellate(const RenderShape *rshape, const Matrix& matrix);
+
+    RenderRegion bounds() const;
 
 private:
     uint32_t pushVertex(float x, float y);
@@ -192,6 +199,8 @@ private:
 private:
     Array<float>* mResPoints;
     Array<uint32_t>* mResIndices;
+    GlPoint mLeftTop = {};
+    GlPoint mRightBottom = {};
 };
 
 }  // namespace tvg