/* * 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 "GrAAStrokeRectBatch.h" #include "GrBatchFlushState.h" #include "GrDefaultGeoProcFactory.h" #include "GrResourceKey.h" #include "GrResourceProvider.h" GR_DECLARE_STATIC_UNIQUE_KEY(gMiterIndexBufferKey); GR_DECLARE_STATIC_UNIQUE_KEY(gBevelIndexBufferKey); static void set_inset_fan(SkPoint* pts, size_t stride, const SkRect& r, SkScalar dx, SkScalar dy) { pts->setRectFan(r.fLeft + dx, r.fTop + dy, r.fRight - dx, r.fBottom - dy, stride); } static const GrGeometryProcessor* create_stroke_rect_gp(bool tweakAlphaForCoverage, const SkMatrix& viewMatrix, bool usesLocalCoords, bool coverageIgnored) { using namespace GrDefaultGeoProcFactory; Color color(Color::kAttribute_Type); Coverage::Type coverageType; // TODO remove coverage if coverage is ignored /*if (coverageIgnored) { coverageType = Coverage::kNone_Type; } else*/ if (tweakAlphaForCoverage) { coverageType = Coverage::kSolid_Type; } else { coverageType = Coverage::kAttribute_Type; } Coverage coverage(coverageType); LocalCoords localCoords(usesLocalCoords ? LocalCoords::kUsePosition_Type : LocalCoords::kUnused_Type); return CreateForDeviceSpace(color, coverage, localCoords, viewMatrix); } void GrAAStrokeRectBatch::initBatchTracker(const GrPipelineOptimizations& opt) { // Handle any color overrides if (!opt.readsColor()) { fGeoData[0].fColor = GrColor_ILLEGAL; } opt.getOverrideColorIfSet(&fGeoData[0].fColor); // setup batch properties fBatch.fColorIgnored = !opt.readsColor(); fBatch.fColor = fGeoData[0].fColor; fBatch.fUsesLocalCoords = opt.readsLocalCoords(); fBatch.fCoverageIgnored = !opt.readsCoverage(); fBatch.fMiterStroke = fGeoData[0].fMiterStroke; fBatch.fCanTweakAlphaForCoverage = opt.canTweakAlphaForCoverage(); } void GrAAStrokeRectBatch::onPrepareDraws(Target* target) { bool canTweakAlphaForCoverage = this->canTweakAlphaForCoverage(); SkAutoTUnref gp(create_stroke_rect_gp(canTweakAlphaForCoverage, this->viewMatrix(), this->usesLocalCoords(), this->coverageIgnored())); if (!gp) { SkDebugf("Couldn't create GrGeometryProcessor\n"); return; } target->initDraw(gp, this->pipeline()); size_t vertexStride = gp->getVertexStride(); SkASSERT(canTweakAlphaForCoverage ? vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorAttr) : vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorCoverageAttr)); int innerVertexNum = 4; int outerVertexNum = this->miterStroke() ? 4 : 8; int verticesPerInstance = (outerVertexNum + innerVertexNum) * 2; int indicesPerInstance = this->miterStroke() ? kMiterIndexCnt : kBevelIndexCnt; int instanceCount = fGeoData.count(); const SkAutoTUnref indexBuffer( GetIndexBuffer(target->resourceProvider(), this->miterStroke())); InstancedHelper helper; void* vertices = helper.init(target, kTriangles_GrPrimitiveType, vertexStride, indexBuffer, verticesPerInstance, indicesPerInstance, instanceCount); if (!vertices || !indexBuffer) { SkDebugf("Could not allocate vertices\n"); return; } for (int i = 0; i < instanceCount; i++) { const Geometry& args = fGeoData[i]; this->generateAAStrokeRectGeometry(vertices, i * verticesPerInstance * vertexStride, vertexStride, outerVertexNum, innerVertexNum, args.fColor, args.fDevOutside, args.fDevOutsideAssist, args.fDevInside, args.fMiterStroke, canTweakAlphaForCoverage); } helper.recordDraw(target); } const GrIndexBuffer* GrAAStrokeRectBatch::GetIndexBuffer(GrResourceProvider* resourceProvider, bool miterStroke) { if (miterStroke) { 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, }; GR_STATIC_ASSERT(SK_ARRAY_COUNT(gMiterIndices) == kMiterIndexCnt); GR_DEFINE_STATIC_UNIQUE_KEY(gMiterIndexBufferKey); return resourceProvider->findOrCreateInstancedIndexBuffer(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 */ 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, }; GR_STATIC_ASSERT(SK_ARRAY_COUNT(gBevelIndices) == kBevelIndexCnt); GR_DEFINE_STATIC_UNIQUE_KEY(gBevelIndexBufferKey); return resourceProvider->findOrCreateInstancedIndexBuffer(gBevelIndices, kBevelIndexCnt, kNumBevelRectsInIndexBuffer, kBevelVertexCnt, gBevelIndexBufferKey); } } bool GrAAStrokeRectBatch::onCombineIfPossible(GrBatch* t, const GrCaps& caps) { GrAAStrokeRectBatch* that = t->cast(); if (!GrPipeline::CanCombine(*this->pipeline(), this->bounds(), *that->pipeline(), that->bounds(), caps)) { return false; } // TODO batch across miterstroke changes if (this->miterStroke() != that->miterStroke()) { return false; } // 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 batch. We could actually upload the viewmatrix // using vertex attributes in these cases, but haven't investigated that if (this->usesLocalCoords() && !this->viewMatrix().cheapEqualTo(that->viewMatrix())) { return false; } // In the event of two batches, one who can tweak, one who cannot, we just fall back to // not tweaking if (this->canTweakAlphaForCoverage() != that->canTweakAlphaForCoverage()) { fBatch.fCanTweakAlphaForCoverage = false; } if (this->color() != that->color()) { fBatch.fColor = GrColor_ILLEGAL; } fGeoData.push_back_n(that->geoData()->count(), that->geoData()->begin()); this->joinBounds(that->bounds()); return true; } void GrAAStrokeRectBatch::generateAAStrokeRectGeometry(void* vertices, size_t offset, size_t vertexStride, int outerVertexNum, int innerVertexNum, GrColor color, const SkRect& devOutside, const SkRect& devOutsideAssist, const SkRect& devInside, bool miterStroke, bool tweakAlphaForCoverage) const { intptr_t verts = reinterpret_cast(vertices) + offset; // 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. // The following pointers refer to the four rects, from outermost to innermost. SkPoint* fan0Pos = reinterpret_cast(verts); SkPoint* fan1Pos = reinterpret_cast(verts + outerVertexNum * vertexStride); SkPoint* fan2Pos = reinterpret_cast(verts + 2 * outerVertexNum * vertexStride); SkPoint* fan3Pos = reinterpret_cast(verts + (2 * outerVertexNum + innerVertexNum) * vertexStride); #ifndef SK_IGNORE_THIN_STROKED_RECT_FIX // 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 = 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 SkScalar inset = SK_ScalarHalf; #endif if (miterStroke) { // outermost set_inset_fan(fan0Pos, vertexStride, devOutside, -SK_ScalarHalf, -SK_ScalarHalf); // inner two set_inset_fan(fan1Pos, vertexStride, devOutside, inset, inset); set_inset_fan(fan2Pos, vertexStride, devInside, -inset, -inset); // innermost set_inset_fan(fan3Pos, vertexStride, devInside, SK_ScalarHalf, SK_ScalarHalf); } else { SkPoint* fan0AssistPos = reinterpret_cast(verts + 4 * vertexStride); SkPoint* fan1AssistPos = reinterpret_cast(verts + (outerVertexNum + 4) * vertexStride); // outermost set_inset_fan(fan0Pos, vertexStride, devOutside, -SK_ScalarHalf, -SK_ScalarHalf); set_inset_fan(fan0AssistPos, vertexStride, devOutsideAssist, -SK_ScalarHalf, -SK_ScalarHalf); // outer one of the inner two set_inset_fan(fan1Pos, vertexStride, devOutside, inset, inset); set_inset_fan(fan1AssistPos, vertexStride, devOutsideAssist, inset, inset); // inner one of the inner two set_inset_fan(fan2Pos, vertexStride, devInside, -inset, -inset); // innermost set_inset_fan(fan3Pos, vertexStride, devInside, SK_ScalarHalf, SK_ScalarHalf); } // Make verts point to vertex color and then set all the color and coverage vertex attrs // values. The outermost rect has 0 coverage verts += sizeof(SkPoint); for (int i = 0; i < outerVertexNum; ++i) { if (tweakAlphaForCoverage) { *reinterpret_cast(verts + i * vertexStride) = 0; } else { *reinterpret_cast(verts + i * vertexStride) = color; *reinterpret_cast(verts + i * vertexStride + sizeof(GrColor)) = 0; } } // scale is the coverage for the the inner two rects. int scale; if (inset < SK_ScalarHalf) { scale = SkScalarFloorToInt(512.0f * inset / (inset + SK_ScalarHalf)); SkASSERT(scale >= 0 && scale <= 255); } else { scale = 0xff; } float innerCoverage = GrNormalizeByteToFloat(scale); GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale); verts += outerVertexNum * vertexStride; for (int i = 0; i < outerVertexNum + innerVertexNum; ++i) { if (tweakAlphaForCoverage) { *reinterpret_cast(verts + i * vertexStride) = scaledColor; } else { *reinterpret_cast(verts + i * vertexStride) = color; *reinterpret_cast(verts + i * vertexStride + sizeof(GrColor)) = innerCoverage; } } // The innermost rect has 0 coverage verts += (outerVertexNum + innerVertexNum) * vertexStride; for (int i = 0; i < innerVertexNum; ++i) { if (tweakAlphaForCoverage) { *reinterpret_cast(verts + i * vertexStride) = 0; } else { *reinterpret_cast(verts + i * vertexStride) = color; *reinterpret_cast(verts + i * vertexStride + sizeof(GrColor)) = 0; } } } /////////////////////////////////////////////////////////////////////////////////////////////////// #ifdef GR_TEST_UTILS #include "GrBatchTest.h" DRAW_BATCH_TEST_DEFINE(AAStrokeRectBatch) { bool miterStroke = random->nextBool(); // Create mock stroke rect SkRect outside = GrTest::TestRect(random); SkScalar minDim = SkMinScalar(outside.width(), outside.height()); SkScalar strokeWidth = minDim * 0.1f; SkRect outsideAssist = outside; outsideAssist.outset(strokeWidth, strokeWidth); SkRect inside = outside; inside.inset(strokeWidth, strokeWidth); GrAAStrokeRectBatch::Geometry geo; geo.fColor = GrRandomColor(random); geo.fDevOutside = outside; geo.fDevOutsideAssist = outsideAssist; geo.fDevInside = inside; geo.fMiterStroke = miterStroke; return GrAAStrokeRectBatch::Create(geo, GrTest::TestMatrix(random)); } #endif