| /* |
| * Copyright 2018 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "src/gpu/ops/GrStrokeRectOp.h" |
| |
| #include "include/core/SkStrokeRec.h" |
| #include "include/private/GrResourceKey.h" |
| #include "include/utils/SkRandom.h" |
| #include "src/gpu/GrCaps.h" |
| #include "src/gpu/GrColor.h" |
| #include "src/gpu/GrDefaultGeoProcFactory.h" |
| #include "src/gpu/GrDrawOpTest.h" |
| #include "src/gpu/GrOpFlushState.h" |
| #include "src/gpu/GrResourceProvider.h" |
| #include "src/gpu/GrVertexWriter.h" |
| #include "src/gpu/ops/GrFillRectOp.h" |
| #include "src/gpu/ops/GrMeshDrawOp.h" |
| #include "src/gpu/ops/GrSimpleMeshDrawOpHelper.h" |
| |
| namespace { |
| |
| // We support all hairlines, bevels, and miters, but not round joins. Also, check whether the miter |
| // limit makes a miter join effectively beveled. If the miter is effectively beveled, it is only |
| // supported when using an AA stroke. |
| inline static bool allowed_stroke(const SkStrokeRec& stroke, GrAA aa, bool* isMiter) { |
| SkASSERT(stroke.getStyle() == SkStrokeRec::kStroke_Style || |
| stroke.getStyle() == SkStrokeRec::kHairline_Style); |
| // For hairlines, make bevel and round joins appear the same as mitered ones. |
| if (!stroke.getWidth()) { |
| *isMiter = true; |
| return true; |
| } |
| if (stroke.getJoin() == SkPaint::kBevel_Join) { |
| *isMiter = false; |
| return aa == GrAA::kYes; // bevel only supported with AA |
| } |
| if (stroke.getJoin() == SkPaint::kMiter_Join) { |
| *isMiter = stroke.getMiter() >= SK_ScalarSqrt2; |
| // Supported under non-AA only if it remains mitered |
| return aa == GrAA::kYes || *isMiter; |
| } |
| return false; |
| } |
| |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| // Non-AA Stroking |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| /* create a triangle strip that strokes the specified rect. There are 8 |
| unique vertices, but we repeat the last 2 to close up. Alternatively we |
| could use an indices array, and then only send 8 verts, but not sure that |
| would be faster. |
| */ |
| static void init_nonaa_stroke_rect_strip(SkPoint verts[10], const SkRect& rect, SkScalar width) { |
| const SkScalar rad = SkScalarHalf(width); |
| |
| verts[0].set(rect.fLeft + rad, rect.fTop + rad); |
| verts[1].set(rect.fLeft - rad, rect.fTop - rad); |
| verts[2].set(rect.fRight - rad, rect.fTop + rad); |
| verts[3].set(rect.fRight + rad, rect.fTop - rad); |
| verts[4].set(rect.fRight - rad, rect.fBottom - rad); |
| verts[5].set(rect.fRight + rad, rect.fBottom + rad); |
| verts[6].set(rect.fLeft + rad, rect.fBottom - rad); |
| verts[7].set(rect.fLeft - rad, rect.fBottom + rad); |
| verts[8] = verts[0]; |
| verts[9] = verts[1]; |
| |
| // TODO: we should be catching this higher up the call stack and just draw a single |
| // non-AA rect |
| if (2*rad >= rect.width()) { |
| verts[0].fX = verts[2].fX = verts[4].fX = verts[6].fX = verts[8].fX = rect.centerX(); |
| } |
| if (2*rad >= rect.height()) { |
| verts[0].fY = verts[2].fY = verts[4].fY = verts[6].fY = verts[8].fY = rect.centerY(); |
| } |
| } |
| |
| class NonAAStrokeRectOp final : public GrMeshDrawOp { |
| private: |
| using Helper = GrSimpleMeshDrawOpHelper; |
| |
| public: |
| DEFINE_OP_CLASS_ID |
| |
| const char* name() const override { return "NonAAStrokeRectOp"; } |
| |
| void visitProxies(const VisitProxyFunc& func) const override { |
| fHelper.visitProxies(func); |
| } |
| |
| #ifdef SK_DEBUG |
| SkString dumpInfo() const override { |
| SkString string; |
| string.appendf( |
| "Color: 0x%08x, Rect [L: %.2f, T: %.2f, R: %.2f, B: %.2f], " |
| "StrokeWidth: %.2f\n", |
| fColor.toBytes_RGBA(), fRect.fLeft, fRect.fTop, fRect.fRight, fRect.fBottom, |
| fStrokeWidth); |
| string += fHelper.dumpInfo(); |
| string += INHERITED::dumpInfo(); |
| return string; |
| } |
| #endif |
| |
| static std::unique_ptr<GrDrawOp> Make(GrRecordingContext* context, |
| GrPaint&& paint, |
| const SkMatrix& viewMatrix, |
| const SkRect& rect, |
| const SkStrokeRec& stroke, |
| GrAAType aaType) { |
| bool isMiter; |
| if (!allowed_stroke(stroke, GrAA::kNo, &isMiter)) { |
| return nullptr; |
| } |
| Helper::InputFlags inputFlags = Helper::InputFlags::kNone; |
| // Depending on sub-pixel coordinates and the particular GPU, we may lose a corner of |
| // hairline rects. We jam all the vertices to pixel centers to avoid this, but not |
| // when MSAA is enabled because it can cause ugly artifacts. |
| if (stroke.getStyle() == SkStrokeRec::kHairline_Style && aaType != GrAAType::kMSAA) { |
| inputFlags |= Helper::InputFlags::kSnapVerticesToPixelCenters; |
| } |
| return Helper::FactoryHelper<NonAAStrokeRectOp>(context, std::move(paint), inputFlags, |
| viewMatrix, rect, |
| stroke, aaType); |
| } |
| |
| NonAAStrokeRectOp(const Helper::MakeArgs& helperArgs, const SkPMColor4f& color, |
| Helper::InputFlags inputFlags, const SkMatrix& viewMatrix, const SkRect& rect, |
| const SkStrokeRec& stroke, GrAAType aaType) |
| : INHERITED(ClassID()), fHelper(helperArgs, aaType, inputFlags) { |
| fColor = color; |
| fViewMatrix = viewMatrix; |
| fRect = rect; |
| // Sort the rect for hairlines |
| fRect.sort(); |
| fStrokeWidth = stroke.getWidth(); |
| |
| SkScalar rad = SkScalarHalf(fStrokeWidth); |
| SkRect bounds = rect; |
| bounds.outset(rad, rad); |
| |
| // If our caller snaps to pixel centers then we have to round out the bounds |
| if (inputFlags & Helper::InputFlags::kSnapVerticesToPixelCenters) { |
| SkASSERT(!fStrokeWidth || aaType == GrAAType::kNone); |
| viewMatrix.mapRect(&bounds); |
| // We want to be consistent with how we snap non-aa lines. To match what we do in |
| // GrGLSLVertexShaderBuilder, we first floor all the vertex values and then add half a |
| // pixel to force us to pixel centers. |
| bounds.setLTRB(SkScalarFloorToScalar(bounds.fLeft), |
| SkScalarFloorToScalar(bounds.fTop), |
| SkScalarFloorToScalar(bounds.fRight), |
| SkScalarFloorToScalar(bounds.fBottom)); |
| bounds.offset(0.5f, 0.5f); |
| this->setBounds(bounds, HasAABloat::kNo, IsHairline::kNo); |
| } else { |
| HasAABloat aaBloat = (aaType == GrAAType::kNone) ? HasAABloat ::kNo : HasAABloat::kYes; |
| this->setTransformedBounds(bounds, fViewMatrix, aaBloat, |
| fStrokeWidth ? IsHairline::kNo : IsHairline::kYes); |
| } |
| } |
| |
| FixedFunctionFlags fixedFunctionFlags() const override { return fHelper.fixedFunctionFlags(); } |
| |
| GrProcessorSet::Analysis finalize( |
| const GrCaps& caps, const GrAppliedClip* clip, bool hasMixedSampledCoverage, |
| GrClampType clampType) override { |
| // This Op uses uniform (not vertex) color, so doesn't need to track wide color. |
| return fHelper.finalizeProcessors(caps, clip, hasMixedSampledCoverage, clampType, |
| GrProcessorAnalysisCoverage::kNone, &fColor, nullptr); |
| } |
| |
| private: |
| void onPrepareDraws(Target* target) override { |
| sk_sp<GrGeometryProcessor> gp; |
| { |
| using namespace GrDefaultGeoProcFactory; |
| Color color(fColor); |
| LocalCoords::Type localCoordsType = fHelper.usesLocalCoords() |
| ? LocalCoords::kUsePosition_Type |
| : LocalCoords::kUnused_Type; |
| gp = GrDefaultGeoProcFactory::Make(target->caps().shaderCaps(), color, |
| Coverage::kSolid_Type, localCoordsType, |
| fViewMatrix); |
| } |
| |
| size_t kVertexStride = gp->vertexStride(); |
| int vertexCount = kVertsPerHairlineRect; |
| if (fStrokeWidth > 0) { |
| vertexCount = kVertsPerStrokeRect; |
| } |
| |
| sk_sp<const GrBuffer> vertexBuffer; |
| int firstVertex; |
| |
| void* verts = |
| target->makeVertexSpace(kVertexStride, vertexCount, &vertexBuffer, &firstVertex); |
| |
| if (!verts) { |
| SkDebugf("Could not allocate vertices\n"); |
| return; |
| } |
| |
| SkPoint* vertex = reinterpret_cast<SkPoint*>(verts); |
| |
| GrPrimitiveType primType; |
| if (fStrokeWidth > 0) { |
| primType = GrPrimitiveType::kTriangleStrip; |
| init_nonaa_stroke_rect_strip(vertex, fRect, fStrokeWidth); |
| } else { |
| // hairline |
| primType = GrPrimitiveType::kLineStrip; |
| vertex[0].set(fRect.fLeft, fRect.fTop); |
| vertex[1].set(fRect.fRight, fRect.fTop); |
| vertex[2].set(fRect.fRight, fRect.fBottom); |
| vertex[3].set(fRect.fLeft, fRect.fBottom); |
| vertex[4].set(fRect.fLeft, fRect.fTop); |
| } |
| |
| GrMesh* mesh = target->allocMesh(primType); |
| mesh->setNonIndexedNonInstanced(vertexCount); |
| mesh->setVertexData(std::move(vertexBuffer), firstVertex); |
| target->recordDraw(std::move(gp), mesh); |
| } |
| |
| void onExecute(GrOpFlushState* flushState, const SkRect& chainBounds) override { |
| fHelper.executeDrawsAndUploads(this, flushState, chainBounds); |
| } |
| |
| // TODO: override onCombineIfPossible |
| |
| Helper fHelper; |
| SkPMColor4f fColor; |
| SkMatrix fViewMatrix; |
| SkRect fRect; |
| SkScalar fStrokeWidth; |
| |
| const static int kVertsPerHairlineRect = 5; |
| const static int kVertsPerStrokeRect = 10; |
| |
| typedef GrMeshDrawOp INHERITED; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| // AA Stroking |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DECLARE_STATIC_UNIQUE_KEY(gMiterIndexBufferKey); |
| GR_DECLARE_STATIC_UNIQUE_KEY(gBevelIndexBufferKey); |
| |
| static void compute_aa_rects(SkRect* devOutside, SkRect* devOutsideAssist, SkRect* devInside, |
| bool* isDegenerate, const SkMatrix& viewMatrix, const SkRect& rect, |
| SkScalar strokeWidth, bool miterStroke) { |
| SkRect devRect; |
| viewMatrix.mapRect(&devRect, rect); |
| |
| SkVector devStrokeSize; |
| if (strokeWidth > 0) { |
| devStrokeSize.set(strokeWidth, strokeWidth); |
| viewMatrix.mapVectors(&devStrokeSize, 1); |
| devStrokeSize.setAbs(devStrokeSize); |
| } else { |
| devStrokeSize.set(SK_Scalar1, SK_Scalar1); |
| } |
| |
| const SkScalar dx = devStrokeSize.fX; |
| const SkScalar dy = devStrokeSize.fY; |
| const SkScalar rx = SkScalarHalf(dx); |
| const SkScalar ry = SkScalarHalf(dy); |
| |
| *devOutside = devRect; |
| *devOutsideAssist = devRect; |
| *devInside = devRect; |
| |
| devOutside->outset(rx, ry); |
| devInside->inset(rx, ry); |
| |
| // If we have a degenerate stroking rect(ie the stroke is larger than inner rect) then we |
| // make a degenerate inside rect to avoid double hitting. We will also jam all of the points |
| // together when we render these rects. |
| SkScalar spare; |
| { |
| SkScalar w = devRect.width() - dx; |
| SkScalar h = devRect.height() - dy; |
| spare = SkTMin(w, h); |
| } |
| |
| *isDegenerate = spare <= 0; |
| if (*isDegenerate) { |
| devInside->fLeft = devInside->fRight = devRect.centerX(); |
| devInside->fTop = devInside->fBottom = devRect.centerY(); |
| } |
| |
| // For bevel-stroke, use 2 SkRect instances(devOutside and devOutsideAssist) |
| // to draw the outside of the octagon. Because there are 8 vertices on the outer |
| // edge, while vertex number of inner edge is 4, the same as miter-stroke. |
| if (!miterStroke) { |
| devOutside->inset(0, ry); |
| devOutsideAssist->outset(0, ry); |
| } |
| } |
| |
| static sk_sp<GrGeometryProcessor> create_aa_stroke_rect_gp(const GrShaderCaps* shaderCaps, |
| bool tweakAlphaForCoverage, |
| const SkMatrix& viewMatrix, |
| bool usesLocalCoords, |
| bool wideColor) { |
| using namespace GrDefaultGeoProcFactory; |
| |
| Coverage::Type coverageType = |
| tweakAlphaForCoverage ? Coverage::kSolid_Type : Coverage::kAttribute_Type; |
| LocalCoords::Type localCoordsType = |
| usesLocalCoords ? LocalCoords::kUsePosition_Type : LocalCoords::kUnused_Type; |
| Color::Type colorType = |
| wideColor ? Color::kPremulWideColorAttribute_Type: Color::kPremulGrColorAttribute_Type; |
| |
| return MakeForDeviceSpace(shaderCaps, colorType, coverageType, localCoordsType, viewMatrix); |
| } |
| |
| class AAStrokeRectOp final : public GrMeshDrawOp { |
| private: |
| using Helper = GrSimpleMeshDrawOpHelper; |
| |
| public: |
| DEFINE_OP_CLASS_ID |
| |
| static std::unique_ptr<GrDrawOp> Make(GrRecordingContext* context, |
| GrPaint&& paint, |
| const SkMatrix& viewMatrix, |
| const SkRect& devOutside, |
| const SkRect& devInside) { |
| return Helper::FactoryHelper<AAStrokeRectOp>(context, std::move(paint), viewMatrix, |
| devOutside, devInside); |
| } |
| |
| AAStrokeRectOp(const Helper::MakeArgs& helperArgs, const SkPMColor4f& color, |
| const SkMatrix& viewMatrix, const SkRect& devOutside, const SkRect& devInside) |
| : INHERITED(ClassID()) |
| , fHelper(helperArgs, GrAAType::kCoverage) |
| , fViewMatrix(viewMatrix) { |
| SkASSERT(!devOutside.isEmpty()); |
| SkASSERT(!devInside.isEmpty()); |
| |
| fRects.emplace_back(RectInfo{color, devOutside, devOutside, devInside, false}); |
| this->setBounds(devOutside, HasAABloat::kYes, IsHairline::kNo); |
| fMiterStroke = true; |
| } |
| |
| static std::unique_ptr<GrDrawOp> Make(GrRecordingContext* context, |
| GrPaint&& paint, |
| const SkMatrix& viewMatrix, |
| const SkRect& rect, |
| const SkStrokeRec& stroke) { |
| bool isMiter; |
| if (!allowed_stroke(stroke, GrAA::kYes, &isMiter)) { |
| return nullptr; |
| } |
| return Helper::FactoryHelper<AAStrokeRectOp>(context, std::move(paint), viewMatrix, rect, |
| stroke, isMiter); |
| } |
| |
| AAStrokeRectOp(const Helper::MakeArgs& helperArgs, const SkPMColor4f& color, |
| const SkMatrix& viewMatrix, const SkRect& rect, const SkStrokeRec& stroke, |
| bool isMiter) |
| : INHERITED(ClassID()) |
| , fHelper(helperArgs, GrAAType::kCoverage) |
| , fViewMatrix(viewMatrix) { |
| fMiterStroke = isMiter; |
| RectInfo& info = fRects.push_back(); |
| compute_aa_rects(&info.fDevOutside, &info.fDevOutsideAssist, &info.fDevInside, |
| &info.fDegenerate, viewMatrix, rect, stroke.getWidth(), isMiter); |
| info.fColor = color; |
| if (isMiter) { |
| this->setBounds(info.fDevOutside, HasAABloat::kYes, IsHairline::kNo); |
| } else { |
| // The outer polygon of the bevel stroke is an octagon specified by the points of a |
| // pair of overlapping rectangles where one is wide and the other is narrow. |
| SkRect bounds = info.fDevOutside; |
| bounds.joinPossiblyEmptyRect(info.fDevOutsideAssist); |
| this->setBounds(bounds, HasAABloat::kYes, IsHairline::kNo); |
| } |
| } |
| |
| const char* name() const override { return "AAStrokeRect"; } |
| |
| void visitProxies(const VisitProxyFunc& func) const override { |
| fHelper.visitProxies(func); |
| } |
| |
| #ifdef SK_DEBUG |
| SkString dumpInfo() const override { |
| SkString string; |
| for (const auto& info : fRects) { |
| string.appendf( |
| "Color: 0x%08x, ORect [L: %.2f, T: %.2f, R: %.2f, B: %.2f], " |
| "AssistORect [L: %.2f, T: %.2f, R: %.2f, B: %.2f], " |
| "IRect [L: %.2f, T: %.2f, R: %.2f, B: %.2f], Degen: %d", |
| info.fColor.toBytes_RGBA(), info.fDevOutside.fLeft, info.fDevOutside.fTop, |
| info.fDevOutside.fRight, info.fDevOutside.fBottom, info.fDevOutsideAssist.fLeft, |
| info.fDevOutsideAssist.fTop, info.fDevOutsideAssist.fRight, |
| info.fDevOutsideAssist.fBottom, info.fDevInside.fLeft, info.fDevInside.fTop, |
| info.fDevInside.fRight, info.fDevInside.fBottom, info.fDegenerate); |
| } |
| string += fHelper.dumpInfo(); |
| string += INHERITED::dumpInfo(); |
| return string; |
| } |
| #endif |
| |
| FixedFunctionFlags fixedFunctionFlags() const override { return fHelper.fixedFunctionFlags(); } |
| |
| GrProcessorSet::Analysis finalize( |
| const GrCaps& caps, const GrAppliedClip* clip, bool hasMixedSampledCoverage, |
| GrClampType clampType) override { |
| return fHelper.finalizeProcessors( |
| caps, clip, hasMixedSampledCoverage, clampType, |
| GrProcessorAnalysisCoverage::kSingleChannel, &fRects.back().fColor, &fWideColor); |
| } |
| |
| private: |
| void onPrepareDraws(Target*) override; |
| void onExecute(GrOpFlushState*, const SkRect& chainBounds) override; |
| |
| static const int kMiterIndexCnt = 3 * 24; |
| static const int kMiterVertexCnt = 16; |
| static const int kNumMiterRectsInIndexBuffer = 256; |
| |
| static const int kBevelIndexCnt = 48 + 36 + 24; |
| static const int kBevelVertexCnt = 24; |
| static const int kNumBevelRectsInIndexBuffer = 256; |
| |
| static sk_sp<const GrGpuBuffer> GetIndexBuffer(GrResourceProvider*, bool miterStroke); |
| |
| const SkMatrix& viewMatrix() const { return fViewMatrix; } |
| bool miterStroke() const { return fMiterStroke; } |
| |
| CombineResult onCombineIfPossible(GrOp* t, const GrCaps&) override; |
| |
| void generateAAStrokeRectGeometry(GrVertexWriter& vertices, |
| const SkPMColor4f& color, |
| bool wideColor, |
| const SkRect& devOutside, |
| const SkRect& devOutsideAssist, |
| const SkRect& devInside, |
| bool miterStroke, |
| bool degenerate, |
| bool tweakAlphaForCoverage) const; |
| |
| // TODO support AA rotated stroke rects by copying around view matrices |
| struct RectInfo { |
| SkPMColor4f fColor; |
| SkRect fDevOutside; |
| SkRect fDevOutsideAssist; |
| SkRect fDevInside; |
| bool fDegenerate; |
| }; |
| |
| Helper fHelper; |
| SkSTArray<1, RectInfo, true> fRects; |
| SkMatrix fViewMatrix; |
| bool fMiterStroke; |
| bool fWideColor; |
| |
| typedef GrMeshDrawOp INHERITED; |
| }; |
| |
| void AAStrokeRectOp::onPrepareDraws(Target* target) { |
| sk_sp<GrGeometryProcessor> gp(create_aa_stroke_rect_gp(target->caps().shaderCaps(), |
| fHelper.compatibleWithCoverageAsAlpha(), |
| this->viewMatrix(), |
| fHelper.usesLocalCoords(), |
| fWideColor)); |
| if (!gp) { |
| SkDebugf("Couldn't create GrGeometryProcessor\n"); |
| return; |
| } |
| |
| int innerVertexNum = 4; |
| int outerVertexNum = this->miterStroke() ? 4 : 8; |
| int verticesPerInstance = (outerVertexNum + innerVertexNum) * 2; |
| int indicesPerInstance = this->miterStroke() ? kMiterIndexCnt : kBevelIndexCnt; |
| int instanceCount = fRects.count(); |
| |
| sk_sp<const GrGpuBuffer> indexBuffer = |
| GetIndexBuffer(target->resourceProvider(), this->miterStroke()); |
| if (!indexBuffer) { |
| SkDebugf("Could not allocate indices\n"); |
| return; |
| } |
| PatternHelper helper(target, GrPrimitiveType::kTriangles, gp->vertexStride(), |
| std::move(indexBuffer), verticesPerInstance, indicesPerInstance, |
| instanceCount); |
| GrVertexWriter vertices{ helper.vertices() }; |
| if (!vertices.fPtr) { |
| SkDebugf("Could not allocate vertices\n"); |
| return; |
| } |
| |
| for (int i = 0; i < instanceCount; i++) { |
| const RectInfo& info = fRects[i]; |
| this->generateAAStrokeRectGeometry(vertices, |
| info.fColor, |
| fWideColor, |
| info.fDevOutside, |
| info.fDevOutsideAssist, |
| info.fDevInside, |
| fMiterStroke, |
| info.fDegenerate, |
| fHelper.compatibleWithCoverageAsAlpha()); |
| } |
| helper.recordDraw(target, std::move(gp)); |
| } |
| |
| void AAStrokeRectOp::onExecute(GrOpFlushState* flushState, const SkRect& chainBounds) { |
| fHelper.executeDrawsAndUploads(this, flushState, chainBounds); |
| } |
| |
| sk_sp<const GrGpuBuffer> AAStrokeRectOp::GetIndexBuffer(GrResourceProvider* resourceProvider, |
| bool miterStroke) { |
| if (miterStroke) { |
| // clang-format off |
| static const uint16_t gMiterIndices[] = { |
| 0 + 0, 1 + 0, 5 + 0, 5 + 0, 4 + 0, 0 + 0, |
| 1 + 0, 2 + 0, 6 + 0, 6 + 0, 5 + 0, 1 + 0, |
| 2 + 0, 3 + 0, 7 + 0, 7 + 0, 6 + 0, 2 + 0, |
| 3 + 0, 0 + 0, 4 + 0, 4 + 0, 7 + 0, 3 + 0, |
| |
| 0 + 4, 1 + 4, 5 + 4, 5 + 4, 4 + 4, 0 + 4, |
| 1 + 4, 2 + 4, 6 + 4, 6 + 4, 5 + 4, 1 + 4, |
| 2 + 4, 3 + 4, 7 + 4, 7 + 4, 6 + 4, 2 + 4, |
| 3 + 4, 0 + 4, 4 + 4, 4 + 4, 7 + 4, 3 + 4, |
| |
| 0 + 8, 1 + 8, 5 + 8, 5 + 8, 4 + 8, 0 + 8, |
| 1 + 8, 2 + 8, 6 + 8, 6 + 8, 5 + 8, 1 + 8, |
| 2 + 8, 3 + 8, 7 + 8, 7 + 8, 6 + 8, 2 + 8, |
| 3 + 8, 0 + 8, 4 + 8, 4 + 8, 7 + 8, 3 + 8, |
| }; |
| // clang-format on |
| GR_STATIC_ASSERT(SK_ARRAY_COUNT(gMiterIndices) == kMiterIndexCnt); |
| GR_DEFINE_STATIC_UNIQUE_KEY(gMiterIndexBufferKey); |
| return resourceProvider->findOrCreatePatternedIndexBuffer( |
| gMiterIndices, kMiterIndexCnt, kNumMiterRectsInIndexBuffer, kMiterVertexCnt, |
| gMiterIndexBufferKey); |
| } else { |
| /** |
| * As in miter-stroke, index = a + b, and a is the current index, b is the shift |
| * from the first index. The index layout: |
| * outer AA line: 0~3, 4~7 |
| * outer edge: 8~11, 12~15 |
| * inner edge: 16~19 |
| * inner AA line: 20~23 |
| * Following comes a bevel-stroke rect and its indices: |
| * |
| * 4 7 |
| * ********************************* |
| * * ______________________________ * |
| * * / 12 15 \ * |
| * * / \ * |
| * 0 * |8 16_____________________19 11 | * 3 |
| * * | | | | * |
| * * | | **************** | | * |
| * * | | * 20 23 * | | * |
| * * | | * * | | * |
| * * | | * 21 22 * | | * |
| * * | | **************** | | * |
| * * | |____________________| | * |
| * 1 * |9 17 18 10| * 2 |
| * * \ / * |
| * * \13 __________________________14/ * |
| * * * |
| * ********************************** |
| * 5 6 |
| */ |
| // clang-format off |
| static const uint16_t gBevelIndices[] = { |
| // Draw outer AA, from outer AA line to outer edge, shift is 0. |
| 0 + 0, 1 + 0, 9 + 0, 9 + 0, 8 + 0, 0 + 0, |
| 1 + 0, 5 + 0, 13 + 0, 13 + 0, 9 + 0, 1 + 0, |
| 5 + 0, 6 + 0, 14 + 0, 14 + 0, 13 + 0, 5 + 0, |
| 6 + 0, 2 + 0, 10 + 0, 10 + 0, 14 + 0, 6 + 0, |
| 2 + 0, 3 + 0, 11 + 0, 11 + 0, 10 + 0, 2 + 0, |
| 3 + 0, 7 + 0, 15 + 0, 15 + 0, 11 + 0, 3 + 0, |
| 7 + 0, 4 + 0, 12 + 0, 12 + 0, 15 + 0, 7 + 0, |
| 4 + 0, 0 + 0, 8 + 0, 8 + 0, 12 + 0, 4 + 0, |
| |
| // Draw the stroke, from outer edge to inner edge, shift is 8. |
| 0 + 8, 1 + 8, 9 + 8, 9 + 8, 8 + 8, 0 + 8, |
| 1 + 8, 5 + 8, 9 + 8, |
| 5 + 8, 6 + 8, 10 + 8, 10 + 8, 9 + 8, 5 + 8, |
| 6 + 8, 2 + 8, 10 + 8, |
| 2 + 8, 3 + 8, 11 + 8, 11 + 8, 10 + 8, 2 + 8, |
| 3 + 8, 7 + 8, 11 + 8, |
| 7 + 8, 4 + 8, 8 + 8, 8 + 8, 11 + 8, 7 + 8, |
| 4 + 8, 0 + 8, 8 + 8, |
| |
| // Draw the inner AA, from inner edge to inner AA line, shift is 16. |
| 0 + 16, 1 + 16, 5 + 16, 5 + 16, 4 + 16, 0 + 16, |
| 1 + 16, 2 + 16, 6 + 16, 6 + 16, 5 + 16, 1 + 16, |
| 2 + 16, 3 + 16, 7 + 16, 7 + 16, 6 + 16, 2 + 16, |
| 3 + 16, 0 + 16, 4 + 16, 4 + 16, 7 + 16, 3 + 16, |
| }; |
| // clang-format on |
| GR_STATIC_ASSERT(SK_ARRAY_COUNT(gBevelIndices) == kBevelIndexCnt); |
| |
| GR_DEFINE_STATIC_UNIQUE_KEY(gBevelIndexBufferKey); |
| return resourceProvider->findOrCreatePatternedIndexBuffer( |
| gBevelIndices, kBevelIndexCnt, kNumBevelRectsInIndexBuffer, kBevelVertexCnt, |
| gBevelIndexBufferKey); |
| } |
| } |
| |
| GrOp::CombineResult AAStrokeRectOp::onCombineIfPossible(GrOp* t, const GrCaps& caps) { |
| AAStrokeRectOp* that = t->cast<AAStrokeRectOp>(); |
| |
| if (!fHelper.isCompatible(that->fHelper, caps, this->bounds(), that->bounds())) { |
| return CombineResult::kCannotCombine; |
| } |
| |
| // TODO combine across miterstroke changes |
| if (this->miterStroke() != that->miterStroke()) { |
| return CombineResult::kCannotCombine; |
| } |
| |
| // We apply the viewmatrix to the rect points on the cpu. However, if the pipeline uses |
| // local coords then we won't be able to combine. TODO: Upload local coords as an attribute. |
| if (fHelper.usesLocalCoords() && !this->viewMatrix().cheapEqualTo(that->viewMatrix())) { |
| return CombineResult::kCannotCombine; |
| } |
| |
| fRects.push_back_n(that->fRects.count(), that->fRects.begin()); |
| fWideColor |= that->fWideColor; |
| return CombineResult::kMerged; |
| } |
| |
| static void setup_scale(int* scale, SkScalar inset) { |
| if (inset < SK_ScalarHalf) { |
| *scale = SkScalarFloorToInt(512.0f * inset / (inset + SK_ScalarHalf)); |
| SkASSERT(*scale >= 0 && *scale <= 255); |
| } else { |
| *scale = 0xff; |
| } |
| } |
| |
| void AAStrokeRectOp::generateAAStrokeRectGeometry(GrVertexWriter& vertices, |
| const SkPMColor4f& color, |
| bool wideColor, |
| const SkRect& devOutside, |
| const SkRect& devOutsideAssist, |
| const SkRect& devInside, |
| bool miterStroke, |
| bool degenerate, |
| bool tweakAlphaForCoverage) const { |
| // We create vertices for four nested rectangles. There are two ramps from 0 to full |
| // coverage, one on the exterior of the stroke and the other on the interior. |
| |
| // TODO: this only really works if the X & Y margins are the same all around |
| // the rect (or if they are all >= 1.0). |
| SkScalar inset; |
| if (!degenerate) { |
| inset = SkMinScalar(SK_Scalar1, devOutside.fRight - devInside.fRight); |
| inset = SkMinScalar(inset, devInside.fLeft - devOutside.fLeft); |
| inset = SkMinScalar(inset, devInside.fTop - devOutside.fTop); |
| if (miterStroke) { |
| inset = SK_ScalarHalf * SkMinScalar(inset, devOutside.fBottom - devInside.fBottom); |
| } else { |
| inset = SK_ScalarHalf * |
| SkMinScalar(inset, devOutsideAssist.fBottom - devInside.fBottom); |
| } |
| SkASSERT(inset >= 0); |
| } else { |
| // TODO use real devRect here |
| inset = SkMinScalar(devOutside.width(), SK_Scalar1); |
| inset = SK_ScalarHalf * |
| SkMinScalar(inset, SkTMax(devOutside.height(), devOutsideAssist.height())); |
| } |
| |
| auto inset_fan = [](const SkRect& r, SkScalar dx, SkScalar dy) { |
| return GrVertexWriter::TriFanFromRect(r.makeInset(dx, dy)); |
| }; |
| |
| auto maybe_coverage = [tweakAlphaForCoverage](float coverage) { |
| return GrVertexWriter::If(!tweakAlphaForCoverage, coverage); |
| }; |
| |
| GrVertexColor outerColor(tweakAlphaForCoverage ? SK_PMColor4fTRANSPARENT : color, wideColor); |
| |
| // Outermost rect |
| vertices.writeQuad(inset_fan(devOutside, -SK_ScalarHalf, -SK_ScalarHalf), |
| outerColor, |
| maybe_coverage(0.0f)); |
| |
| if (!miterStroke) { |
| // Second outermost |
| vertices.writeQuad(inset_fan(devOutsideAssist, -SK_ScalarHalf, -SK_ScalarHalf), |
| outerColor, |
| maybe_coverage(0.0f)); |
| } |
| |
| // scale is the coverage for the the inner two rects. |
| int scale; |
| setup_scale(&scale, inset); |
| |
| float innerCoverage = GrNormalizeByteToFloat(scale); |
| SkPMColor4f scaledColor = color * innerCoverage; |
| GrVertexColor innerColor(tweakAlphaForCoverage ? scaledColor : color, wideColor); |
| |
| // Inner rect |
| vertices.writeQuad(inset_fan(devOutside, inset, inset), |
| innerColor, |
| maybe_coverage(innerCoverage)); |
| |
| if (!miterStroke) { |
| // Second inner |
| vertices.writeQuad(inset_fan(devOutsideAssist, inset, inset), |
| innerColor, |
| maybe_coverage(innerCoverage)); |
| } |
| |
| if (!degenerate) { |
| vertices.writeQuad(inset_fan(devInside, -inset, -inset), |
| innerColor, |
| maybe_coverage(innerCoverage)); |
| |
| // The innermost rect has 0 coverage... |
| vertices.writeQuad(inset_fan(devInside, SK_ScalarHalf, SK_ScalarHalf), |
| outerColor, |
| maybe_coverage(0.0f)); |
| } else { |
| // When the interior rect has become degenerate we smoosh to a single point |
| SkASSERT(devInside.fLeft == devInside.fRight && devInside.fTop == devInside.fBottom); |
| |
| vertices.writeQuad(GrVertexWriter::TriFanFromRect(devInside), |
| innerColor, |
| maybe_coverage(innerCoverage)); |
| |
| // ... unless we are degenerate, in which case we must apply the scaled coverage |
| vertices.writeQuad(GrVertexWriter::TriFanFromRect(devInside), |
| innerColor, |
| maybe_coverage(innerCoverage)); |
| } |
| } |
| |
| } // anonymous namespace |
| |
| namespace GrStrokeRectOp { |
| |
| std::unique_ptr<GrDrawOp> Make(GrRecordingContext* context, |
| GrPaint&& paint, |
| GrAAType aaType, |
| const SkMatrix& viewMatrix, |
| const SkRect& rect, |
| const SkStrokeRec& stroke) { |
| if (aaType == GrAAType::kCoverage) { |
| // The AA op only supports axis-aligned rectangles |
| if (!viewMatrix.rectStaysRect()) { |
| return nullptr; |
| } |
| return AAStrokeRectOp::Make(context, std::move(paint), viewMatrix, rect, stroke); |
| } else { |
| return NonAAStrokeRectOp::Make(context, std::move(paint), viewMatrix, rect, stroke, aaType); |
| } |
| } |
| |
| std::unique_ptr<GrDrawOp> MakeNested(GrRecordingContext* context, |
| GrPaint&& paint, |
| const SkMatrix& viewMatrix, |
| const SkRect rects[2]) { |
| SkASSERT(viewMatrix.rectStaysRect()); |
| SkASSERT(!rects[0].isEmpty() && !rects[1].isEmpty()); |
| |
| SkRect devOutside, devInside; |
| viewMatrix.mapRect(&devOutside, rects[0]); |
| viewMatrix.mapRect(&devInside, rects[1]); |
| if (devInside.isEmpty()) { |
| if (devOutside.isEmpty()) { |
| return nullptr; |
| } |
| return GrFillRectOp::Make(context, std::move(paint), GrAAType::kCoverage, |
| GrQuadAAFlags::kAll, |
| GrQuad::MakeFromRect(rects[0], viewMatrix), |
| GrQuad(rects[0])); |
| } |
| |
| return AAStrokeRectOp::Make(context, std::move(paint), viewMatrix, devOutside, devInside); |
| } |
| |
| } // namespace GrStrokeRectOp |
| |
| #if GR_TEST_UTILS |
| |
| #include "src/gpu/GrDrawOpTest.h" |
| |
| GR_DRAW_OP_TEST_DEFINE(NonAAStrokeRectOp) { |
| SkMatrix viewMatrix = GrTest::TestMatrix(random); |
| SkRect rect = GrTest::TestRect(random); |
| SkScalar strokeWidth = random->nextBool() ? 0.0f : 2.0f; |
| SkPaint strokePaint; |
| strokePaint.setStrokeWidth(strokeWidth); |
| strokePaint.setStyle(SkPaint::kStroke_Style); |
| strokePaint.setStrokeJoin(SkPaint::kMiter_Join); |
| SkStrokeRec strokeRec(strokePaint); |
| GrAAType aaType = GrAAType::kNone; |
| if (numSamples > 1) { |
| aaType = random->nextBool() ? GrAAType::kMSAA : GrAAType::kNone; |
| } |
| return NonAAStrokeRectOp::Make(context, std::move(paint), viewMatrix, rect, strokeRec, aaType); |
| } |
| |
| GR_DRAW_OP_TEST_DEFINE(AAStrokeRectOp) { |
| bool miterStroke = random->nextBool(); |
| |
| // Create either a empty rect or a non-empty rect. |
| SkRect rect = |
| random->nextBool() ? SkRect::MakeXYWH(10, 10, 50, 40) : SkRect::MakeXYWH(6, 7, 0, 0); |
| SkScalar minDim = SkMinScalar(rect.width(), rect.height()); |
| SkScalar strokeWidth = random->nextUScalar1() * minDim; |
| |
| SkStrokeRec rec(SkStrokeRec::kFill_InitStyle); |
| rec.setStrokeStyle(strokeWidth); |
| rec.setStrokeParams(SkPaint::kButt_Cap, |
| miterStroke ? SkPaint::kMiter_Join : SkPaint::kBevel_Join, 1.f); |
| SkMatrix matrix = GrTest::TestMatrixRectStaysRect(random); |
| return AAStrokeRectOp::Make(context, std::move(paint), matrix, rect, rec); |
| } |
| |
| #endif |
