| /* | |
| * 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 "GrStrokeRectOp.h" | |
| #include "GrCaps.h" | |
| #include "GrColor.h" | |
| #include "GrDefaultGeoProcFactory.h" | |
| #include "GrDrawOpTest.h" | |
| #include "GrMeshDrawOp.h" | |
| #include "GrOpFlushState.h" | |
| #include "GrResourceKey.h" | |
| #include "GrResourceProvider.h" | |
| #include "GrSimpleMeshDrawOpHelper.h" | |
| #include "GrVertexWriter.h" | |
| #include "ops/GrFillRectOp.h" | |
| #include "SkRandom.h" | |
| #include "SkStrokeRec.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, VisitorType) 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) { | |
| 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.set(SkScalarFloorToScalar(bounds.fLeft), | |
| SkScalarFloorToScalar(bounds.fTop), | |
| SkScalarFloorToScalar(bounds.fRight), | |
| SkScalarFloorToScalar(bounds.fBottom)); | |
| bounds.offset(0.5f, 0.5f); | |
| this->setBounds(bounds, HasAABloat::kNo, IsZeroArea::kNo); | |
| } else { | |
| this->setTransformedBounds(bounds, fViewMatrix, HasAABloat::kNo, IsZeroArea::kNo); | |
| } | |
| } | |
| FixedFunctionFlags fixedFunctionFlags() const override { return fHelper.fixedFunctionFlags(); } | |
| GrProcessorSet::Analysis finalize(const GrCaps& caps, const GrAppliedClip* clip, | |
| GrFSAAType fsaaType, GrClampType clampType) override { | |
| // This Op uses uniform (not vertex) color, so doesn't need to track wide color. | |
| return fHelper.finalizeProcessors(caps, clip, fsaaType, 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, IsZeroArea::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, IsZeroArea::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, IsZeroArea::kNo); | |
| } | |
| } | |
| const char* name() const override { return "AAStrokeRect"; } | |
| void visitProxies(const VisitProxyFunc& func, VisitorType) 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, | |
| GrFSAAType fsaaType, GrClampType clampType) override { | |
| return fHelper.finalizeProcessors( | |
| caps, clip, fsaaType, 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), | |
| GrVertexColor(SK_PMColor4fTRANSPARENT, wideColor), | |
| 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, viewMatrix, | |
| rects[0]); | |
| } | |
| return AAStrokeRectOp::Make(context, std::move(paint), viewMatrix, devOutside, devInside); | |
| } | |
| } // namespace GrStrokeRectOp | |
| #if GR_TEST_UTILS | |
| #include "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 (fsaaType == GrFSAAType::kUnifiedMSAA) { | |
| 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 |