diff options
author | joshualitt <joshualitt@chromium.org> | 2015-08-10 09:03:51 -0700 |
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committer | Commit bot <commit-bot@chromium.org> | 2015-08-10 09:03:51 -0700 |
commit | 9ff6425ce4a8deeb23b1c706b340d7d4e09f3f9b (patch) | |
tree | 786357fd20f3bcc7f2c018790a7b62d88da19f25 /src/gpu/batches/GrAAStrokeRectBatch.cpp | |
parent | 3a26fc8e9a31e51125c494e1f8605f101ca71d2b (diff) |
move Stroke Rect and AAFill Rect to their own file
BUG=skia:
Review URL: https://codereview.chromium.org/1282723004
Diffstat (limited to 'src/gpu/batches/GrAAStrokeRectBatch.cpp')
-rw-r--r-- | src/gpu/batches/GrAAStrokeRectBatch.cpp | 380 |
1 files changed, 380 insertions, 0 deletions
diff --git a/src/gpu/batches/GrAAStrokeRectBatch.cpp b/src/gpu/batches/GrAAStrokeRectBatch.cpp new file mode 100644 index 0000000000..49329b2a94 --- /dev/null +++ b/src/gpu/batches/GrAAStrokeRectBatch.cpp @@ -0,0 +1,380 @@ +/* + * 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 "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 GrPipelineInfo& init) { + // Handle any color overrides + if (!init.readsColor()) { + fGeoData[0].fColor = GrColor_ILLEGAL; + } + init.getOverrideColorIfSet(&fGeoData[0].fColor); + + // setup batch properties + fBatch.fColorIgnored = !init.readsColor(); + fBatch.fColor = fGeoData[0].fColor; + fBatch.fUsesLocalCoords = init.readsLocalCoords(); + fBatch.fCoverageIgnored = !init.readsCoverage(); + fBatch.fMiterStroke = fGeoData[0].fMiterStroke; + fBatch.fCanTweakAlphaForCoverage = init.canTweakAlphaForCoverage(); +} + +void GrAAStrokeRectBatch::generateGeometry(GrBatchTarget* batchTarget) { + bool canTweakAlphaForCoverage = this->canTweakAlphaForCoverage(); + + SkAutoTUnref<const GrGeometryProcessor> gp(create_stroke_rect_gp(canTweakAlphaForCoverage, + this->viewMatrix(), + this->usesLocalCoords(), + this->coverageIgnored())); + if (!gp) { + SkDebugf("Couldn't create GrGeometryProcessor\n"); + return; + } + + batchTarget->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<const GrIndexBuffer> indexBuffer( + GetIndexBuffer(batchTarget->resourceProvider(), this->miterStroke())); + InstancedHelper helper; + void* vertices = helper.init(batchTarget, 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.issueDraw(batchTarget); +} + +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) { + if (!this->pipeline()->isEqual(*t->pipeline())) { + return false; + } + + GrAAStrokeRectBatch* that = t->cast<GrAAStrokeRectBatch>(); + + // 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<intptr_t>(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<SkPoint*>(verts); + SkPoint* fan1Pos = reinterpret_cast<SkPoint*>(verts + outerVertexNum * vertexStride); + SkPoint* fan2Pos = reinterpret_cast<SkPoint*>(verts + 2 * outerVertexNum * vertexStride); + SkPoint* fan3Pos = reinterpret_cast<SkPoint*>(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<SkPoint*>(verts + 4 * vertexStride); + SkPoint* fan1AssistPos = reinterpret_cast<SkPoint*>(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<GrColor*>(verts + i * vertexStride) = 0; + } else { + *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color; + *reinterpret_cast<float*>(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<GrColor*>(verts + i * vertexStride) = scaledColor; + } else { + *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color; + *reinterpret_cast<float*>(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<GrColor*>(verts + i * vertexStride) = 0; + } else { + *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color; + *reinterpret_cast<GrColor*>(verts + i * vertexStride + sizeof(GrColor)) = 0; + } + } +} + +/////////////////////////////////////////////////////////////////////////////////////////////////// + +#ifdef GR_TEST_UTILS + +#include "GrBatchTest.h" + +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 |