| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "GrAALinearizingConvexPathRenderer.h" |
| #include "GrAAConvexTessellator.h" |
| #include "GrContext.h" |
| #include "GrDefaultGeoProcFactory.h" |
| #include "GrDrawOpTest.h" |
| #include "GrGeometryProcessor.h" |
| #include "GrOpFlushState.h" |
| #include "GrPathUtils.h" |
| #include "GrProcessor.h" |
| #include "GrStyle.h" |
| #include "SkGeometry.h" |
| #include "SkPathPriv.h" |
| #include "SkString.h" |
| #include "SkTraceEvent.h" |
| #include "glsl/GrGLSLGeometryProcessor.h" |
| #include "ops/GrMeshDrawOp.h" |
| #include "ops/GrSimpleMeshDrawOpHelper.h" |
| |
| static const int DEFAULT_BUFFER_SIZE = 100; |
| |
| // The thicker the stroke, the harder it is to produce high-quality results using tessellation. For |
| // the time being, we simply drop back to software rendering above this stroke width. |
| static const SkScalar kMaxStrokeWidth = 20.0; |
| |
| GrAALinearizingConvexPathRenderer::GrAALinearizingConvexPathRenderer() { |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| bool GrAALinearizingConvexPathRenderer::onCanDrawPath(const CanDrawPathArgs& args) const { |
| if (GrAAType::kCoverage != args.fAAType) { |
| return false; |
| } |
| if (!args.fShape->knownToBeConvex()) { |
| return false; |
| } |
| if (args.fShape->style().pathEffect()) { |
| return false; |
| } |
| if (args.fShape->inverseFilled()) { |
| return false; |
| } |
| if (args.fShape->bounds().width() <= 0 && args.fShape->bounds().height() <= 0) { |
| // Stroked zero length lines should draw, but this PR doesn't handle that case |
| return false; |
| } |
| const SkStrokeRec& stroke = args.fShape->style().strokeRec(); |
| |
| if (stroke.getStyle() == SkStrokeRec::kStroke_Style || |
| stroke.getStyle() == SkStrokeRec::kStrokeAndFill_Style) { |
| if (!args.fViewMatrix->isSimilarity()) { |
| return false; |
| } |
| SkScalar strokeWidth = args.fViewMatrix->getMaxScale() * stroke.getWidth(); |
| if (strokeWidth < 1.0f && stroke.getStyle() == SkStrokeRec::kStroke_Style) { |
| return false; |
| } |
| return strokeWidth <= kMaxStrokeWidth && |
| args.fShape->knownToBeClosed() && |
| stroke.getJoin() != SkPaint::Join::kRound_Join; |
| } |
| return stroke.getStyle() == SkStrokeRec::kFill_Style; |
| } |
| |
| // extract the result vertices and indices from the GrAAConvexTessellator |
| static void extract_verts(const GrAAConvexTessellator& tess, |
| void* vertices, |
| size_t vertexStride, |
| GrColor color, |
| uint16_t firstIndex, |
| uint16_t* idxs, |
| bool tweakAlphaForCoverage) { |
| intptr_t verts = reinterpret_cast<intptr_t>(vertices); |
| |
| for (int i = 0; i < tess.numPts(); ++i) { |
| *((SkPoint*)((intptr_t)verts + i * vertexStride)) = tess.point(i); |
| } |
| |
| // Make 'verts' point to the colors |
| verts += sizeof(SkPoint); |
| for (int i = 0; i < tess.numPts(); ++i) { |
| if (tweakAlphaForCoverage) { |
| SkASSERT(SkScalarRoundToInt(255.0f * tess.coverage(i)) <= 255); |
| unsigned scale = SkScalarRoundToInt(255.0f * tess.coverage(i)); |
| GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale); |
| *reinterpret_cast<GrColor*>(verts + i * vertexStride) = scaledColor; |
| } else { |
| *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color; |
| *reinterpret_cast<float*>(verts + i * vertexStride + sizeof(GrColor)) = |
| tess.coverage(i); |
| } |
| } |
| |
| for (int i = 0; i < tess.numIndices(); ++i) { |
| idxs[i] = tess.index(i) + firstIndex; |
| } |
| } |
| |
| static sk_sp<GrGeometryProcessor> create_lines_only_gp(bool tweakAlphaForCoverage, |
| const SkMatrix& viewMatrix, |
| bool usesLocalCoords) { |
| using namespace GrDefaultGeoProcFactory; |
| |
| Coverage::Type coverageType; |
| if (tweakAlphaForCoverage) { |
| coverageType = Coverage::kSolid_Type; |
| } else { |
| coverageType = Coverage::kAttribute_Type; |
| } |
| LocalCoords::Type localCoordsType = |
| usesLocalCoords ? LocalCoords::kUsePosition_Type : LocalCoords::kUnused_Type; |
| return MakeForDeviceSpace(Color::kPremulGrColorAttribute_Type, coverageType, localCoordsType, |
| viewMatrix); |
| } |
| |
| namespace { |
| |
| class AAFlatteningConvexPathOp final : public GrMeshDrawOp { |
| private: |
| using Helper = GrSimpleMeshDrawOpHelperWithStencil; |
| |
| public: |
| DEFINE_OP_CLASS_ID |
| static std::unique_ptr<GrDrawOp> Make(GrPaint&& paint, |
| const SkMatrix& viewMatrix, |
| const SkPath& path, |
| SkScalar strokeWidth, |
| SkStrokeRec::Style style, |
| SkPaint::Join join, |
| SkScalar miterLimit, |
| const GrUserStencilSettings* stencilSettings) { |
| return Helper::FactoryHelper<AAFlatteningConvexPathOp>(std::move(paint), viewMatrix, path, |
| strokeWidth, style, join, miterLimit, |
| stencilSettings); |
| } |
| |
| AAFlatteningConvexPathOp(const Helper::MakeArgs& helperArgs, |
| GrColor color, |
| const SkMatrix& viewMatrix, |
| const SkPath& path, |
| SkScalar strokeWidth, |
| SkStrokeRec::Style style, |
| SkPaint::Join join, |
| SkScalar miterLimit, |
| const GrUserStencilSettings* stencilSettings) |
| : INHERITED(ClassID()), fHelper(helperArgs, GrAAType::kCoverage, stencilSettings) { |
| fPaths.emplace_back( |
| PathData{color, viewMatrix, path, strokeWidth, style, join, miterLimit}); |
| |
| // compute bounds |
| SkRect bounds = path.getBounds(); |
| SkScalar w = strokeWidth; |
| if (w > 0) { |
| w /= 2; |
| // If the half stroke width is < 1 then we effectively fallback to bevel joins. |
| if (SkPaint::kMiter_Join == join && w > 1.f) { |
| w *= miterLimit; |
| } |
| bounds.outset(w, w); |
| } |
| this->setTransformedBounds(bounds, viewMatrix, HasAABloat::kYes, IsZeroArea::kNo); |
| } |
| |
| const char* name() const override { return "AAFlatteningConvexPathOp"; } |
| |
| SkString dumpInfo() const override { |
| SkString string; |
| for (const auto& path : fPaths) { |
| string.appendf( |
| "Color: 0x%08x, StrokeWidth: %.2f, Style: %d, Join: %d, " |
| "MiterLimit: %.2f\n", |
| path.fColor, path.fStrokeWidth, path.fStyle, path.fJoin, path.fMiterLimit); |
| } |
| string += fHelper.dumpInfo(); |
| string += INHERITED::dumpInfo(); |
| return string; |
| } |
| |
| FixedFunctionFlags fixedFunctionFlags() const override { return fHelper.fixedFunctionFlags(); } |
| |
| RequiresDstTexture finalize(const GrCaps& caps, const GrAppliedClip* clip) override { |
| return fHelper.xpRequiresDstTexture(caps, clip, GrProcessorAnalysisCoverage::kSingleChannel, |
| &fPaths.back().fColor); |
| } |
| |
| private: |
| void draw(GrMeshDrawOp::Target* target, const GrGeometryProcessor* gp, |
| const GrPipeline* pipeline, int vertexCount, size_t vertexStride, void* vertices, |
| int indexCount, uint16_t* indices) const { |
| if (vertexCount == 0 || indexCount == 0) { |
| return; |
| } |
| const GrBuffer* vertexBuffer; |
| GrMesh mesh(GrPrimitiveType::kTriangles); |
| int firstVertex; |
| void* verts = target->makeVertexSpace(vertexStride, vertexCount, &vertexBuffer, |
| &firstVertex); |
| if (!verts) { |
| SkDebugf("Could not allocate vertices\n"); |
| return; |
| } |
| memcpy(verts, vertices, vertexCount * vertexStride); |
| |
| const GrBuffer* indexBuffer; |
| int firstIndex; |
| uint16_t* idxs = target->makeIndexSpace(indexCount, &indexBuffer, &firstIndex); |
| if (!idxs) { |
| SkDebugf("Could not allocate indices\n"); |
| return; |
| } |
| memcpy(idxs, indices, indexCount * sizeof(uint16_t)); |
| mesh.setIndexed(indexBuffer, indexCount, firstIndex, 0, vertexCount - 1); |
| mesh.setVertexData(vertexBuffer, firstVertex); |
| target->draw(gp, pipeline, mesh); |
| } |
| |
| void onPrepareDraws(Target* target) const override { |
| const GrPipeline* pipeline = fHelper.makePipeline(target); |
| |
| // Setup GrGeometryProcessor |
| sk_sp<GrGeometryProcessor> gp(create_lines_only_gp(fHelper.compatibleWithAlphaAsCoverage(), |
| this->viewMatrix(), |
| fHelper.usesLocalCoords())); |
| if (!gp) { |
| SkDebugf("Couldn't create a GrGeometryProcessor\n"); |
| return; |
| } |
| |
| size_t vertexStride = gp->getVertexStride(); |
| |
| SkASSERT(fHelper.compatibleWithAlphaAsCoverage() |
| ? vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorAttr) |
| : vertexStride == |
| sizeof(GrDefaultGeoProcFactory::PositionColorCoverageAttr)); |
| |
| int instanceCount = fPaths.count(); |
| |
| int vertexCount = 0; |
| int indexCount = 0; |
| int maxVertices = DEFAULT_BUFFER_SIZE; |
| int maxIndices = DEFAULT_BUFFER_SIZE; |
| uint8_t* vertices = (uint8_t*) sk_malloc_throw(maxVertices * vertexStride); |
| uint16_t* indices = (uint16_t*) sk_malloc_throw(maxIndices * sizeof(uint16_t)); |
| for (int i = 0; i < instanceCount; i++) { |
| const PathData& args = fPaths[i]; |
| GrAAConvexTessellator tess(args.fStyle, args.fStrokeWidth, |
| args.fJoin, args.fMiterLimit); |
| |
| if (!tess.tessellate(args.fViewMatrix, args.fPath)) { |
| continue; |
| } |
| |
| int currentIndices = tess.numIndices(); |
| SkASSERT(currentIndices <= UINT16_MAX); |
| if (indexCount + currentIndices > UINT16_MAX) { |
| // if we added the current instance, we would overflow the indices we can store in a |
| // uint16_t. Draw what we've got so far and reset. |
| this->draw(target, gp.get(), pipeline, vertexCount, vertexStride, vertices, |
| indexCount, indices); |
| vertexCount = 0; |
| indexCount = 0; |
| } |
| int currentVertices = tess.numPts(); |
| if (vertexCount + currentVertices > maxVertices) { |
| maxVertices = SkTMax(vertexCount + currentVertices, maxVertices * 2); |
| vertices = (uint8_t*) sk_realloc_throw(vertices, maxVertices * vertexStride); |
| } |
| if (indexCount + currentIndices > maxIndices) { |
| maxIndices = SkTMax(indexCount + currentIndices, maxIndices * 2); |
| indices = (uint16_t*) sk_realloc_throw(indices, maxIndices * sizeof(uint16_t)); |
| } |
| |
| extract_verts(tess, vertices + vertexStride * vertexCount, vertexStride, args.fColor, |
| vertexCount, indices + indexCount, |
| fHelper.compatibleWithAlphaAsCoverage()); |
| vertexCount += currentVertices; |
| indexCount += currentIndices; |
| } |
| this->draw(target, gp.get(), pipeline, vertexCount, vertexStride, vertices, indexCount, |
| indices); |
| sk_free(vertices); |
| sk_free(indices); |
| } |
| |
| bool onCombineIfPossible(GrOp* t, const GrCaps& caps) override { |
| AAFlatteningConvexPathOp* that = t->cast<AAFlatteningConvexPathOp>(); |
| if (!fHelper.isCompatible(that->fHelper, caps, this->bounds(), that->bounds())) { |
| return false; |
| } |
| |
| fPaths.push_back_n(that->fPaths.count(), that->fPaths.begin()); |
| this->joinBounds(*that); |
| return true; |
| } |
| |
| const SkMatrix& viewMatrix() const { return fPaths[0].fViewMatrix; } |
| |
| struct PathData { |
| GrColor fColor; |
| SkMatrix fViewMatrix; |
| SkPath fPath; |
| SkScalar fStrokeWidth; |
| SkStrokeRec::Style fStyle; |
| SkPaint::Join fJoin; |
| SkScalar fMiterLimit; |
| }; |
| |
| SkSTArray<1, PathData, true> fPaths; |
| Helper fHelper; |
| |
| typedef GrMeshDrawOp INHERITED; |
| }; |
| |
| } // anonymous namespace |
| |
| bool GrAALinearizingConvexPathRenderer::onDrawPath(const DrawPathArgs& args) { |
| GR_AUDIT_TRAIL_AUTO_FRAME(args.fRenderTargetContext->auditTrail(), |
| "GrAALinearizingConvexPathRenderer::onDrawPath"); |
| SkASSERT(GrFSAAType::kUnifiedMSAA != args.fRenderTargetContext->fsaaType()); |
| SkASSERT(!args.fShape->isEmpty()); |
| SkASSERT(!args.fShape->style().pathEffect()); |
| |
| SkPath path; |
| args.fShape->asPath(&path); |
| bool fill = args.fShape->style().isSimpleFill(); |
| const SkStrokeRec& stroke = args.fShape->style().strokeRec(); |
| SkScalar strokeWidth = fill ? -1.0f : stroke.getWidth(); |
| SkPaint::Join join = fill ? SkPaint::Join::kMiter_Join : stroke.getJoin(); |
| SkScalar miterLimit = stroke.getMiter(); |
| |
| std::unique_ptr<GrDrawOp> op = AAFlatteningConvexPathOp::Make( |
| std::move(args.fPaint), *args.fViewMatrix, path, strokeWidth, stroke.getStyle(), join, |
| miterLimit, args.fUserStencilSettings); |
| args.fRenderTargetContext->addDrawOp(*args.fClip, std::move(op)); |
| return true; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| #if GR_TEST_UTILS |
| |
| GR_DRAW_OP_TEST_DEFINE(AAFlatteningConvexPathOp) { |
| SkMatrix viewMatrix = GrTest::TestMatrixPreservesRightAngles(random); |
| SkPath path = GrTest::TestPathConvex(random); |
| |
| SkStrokeRec::Style styles[3] = { SkStrokeRec::kFill_Style, |
| SkStrokeRec::kStroke_Style, |
| SkStrokeRec::kStrokeAndFill_Style }; |
| |
| SkStrokeRec::Style style = styles[random->nextU() % 3]; |
| |
| SkScalar strokeWidth = -1.f; |
| SkPaint::Join join = SkPaint::kMiter_Join; |
| SkScalar miterLimit = 0.5f; |
| |
| if (SkStrokeRec::kFill_Style != style) { |
| strokeWidth = random->nextRangeF(1.0f, 10.0f); |
| if (random->nextBool()) { |
| join = SkPaint::kMiter_Join; |
| } else { |
| join = SkPaint::kBevel_Join; |
| } |
| miterLimit = random->nextRangeF(0.5f, 2.0f); |
| } |
| const GrUserStencilSettings* stencilSettings = GrGetRandomStencil(random, context); |
| return AAFlatteningConvexPathOp::Make(std::move(paint), viewMatrix, path, strokeWidth, style, |
| join, miterLimit, stencilSettings); |
| } |
| |
| #endif |
