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- /*
- * 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) {
- 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, 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, 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) 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),
- 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,
- 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
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