/* * Copyright 2014 Google Inc. * * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ #include "GrAADistanceFieldPathRenderer.h" #include "GrBatchFlushState.h" #include "GrBatchTest.h" #include "GrBuffer.h" #include "GrContext.h" #include "GrPipelineBuilder.h" #include "GrResourceProvider.h" #include "GrSurfacePriv.h" #include "GrSWMaskHelper.h" #include "GrTexturePriv.h" #include "batches/GrVertexBatch.h" #include "effects/GrDistanceFieldGeoProc.h" #include "SkDistanceFieldGen.h" #define ATLAS_TEXTURE_WIDTH 2048 #define ATLAS_TEXTURE_HEIGHT 2048 #define PLOT_WIDTH 512 #define PLOT_HEIGHT 256 #define NUM_PLOTS_X (ATLAS_TEXTURE_WIDTH / PLOT_WIDTH) #define NUM_PLOTS_Y (ATLAS_TEXTURE_HEIGHT / PLOT_HEIGHT) #ifdef DF_PATH_TRACKING static int g_NumCachedShapes = 0; static int g_NumFreedShapes = 0; #endif // mip levels static const int kSmallMIP = 32; static const int kMediumMIP = 73; static const int kLargeMIP = 162; // Callback to clear out internal path cache when eviction occurs void GrAADistanceFieldPathRenderer::HandleEviction(GrBatchAtlas::AtlasID id, void* pr) { GrAADistanceFieldPathRenderer* dfpr = (GrAADistanceFieldPathRenderer*)pr; // remove any paths that use this plot ShapeDataList::Iter iter; iter.init(dfpr->fShapeList, ShapeDataList::Iter::kHead_IterStart); ShapeData* shapeData; while ((shapeData = iter.get())) { iter.next(); if (id == shapeData->fID) { dfpr->fShapeCache.remove(shapeData->fKey); dfpr->fShapeList.remove(shapeData); delete shapeData; #ifdef DF_PATH_TRACKING ++g_NumFreedPaths; #endif } } } //////////////////////////////////////////////////////////////////////////////// GrAADistanceFieldPathRenderer::GrAADistanceFieldPathRenderer() : fAtlas(nullptr) {} GrAADistanceFieldPathRenderer::~GrAADistanceFieldPathRenderer() { ShapeDataList::Iter iter; iter.init(fShapeList, ShapeDataList::Iter::kHead_IterStart); ShapeData* shapeData; while ((shapeData = iter.get())) { iter.next(); delete shapeData; } #ifdef DF_PATH_TRACKING SkDebugf("Cached shapes: %d, freed shapes: %d\n", g_NumCachedShapes, g_NumFreedShapes); #endif } //////////////////////////////////////////////////////////////////////////////// bool GrAADistanceFieldPathRenderer::onCanDrawPath(const CanDrawPathArgs& args) const { if (!args.fShaderCaps->shaderDerivativeSupport()) { return false; } // If the shape has no key then we won't get any reuse. if (!args.fShape->hasUnstyledKey()) { return false; } // This only supports filled paths, however, the caller may apply the style to make a filled // path and try again. if (!args.fShape->style().isSimpleFill()) { return false; } // This does non-inverse antialiased fills. if (!args.fAntiAlias) { return false; } // TODO: Support inverse fill if (args.fShape->inverseFilled()) { return false; } // currently don't support perspective if (args.fViewMatrix->hasPerspective()) { return false; } // only support paths with bounds within kMediumMIP by kMediumMIP, // scaled to have bounds within 2.0f*kLargeMIP by 2.0f*kLargeMIP // the goal is to accelerate rendering of lots of small paths that may be scaling SkScalar maxScale = args.fViewMatrix->getMaxScale(); SkRect bounds = args.fShape->styledBounds(); SkScalar maxDim = SkMaxScalar(bounds.width(), bounds.height()); return maxDim <= kMediumMIP && maxDim * maxScale <= 2.0f*kLargeMIP; } //////////////////////////////////////////////////////////////////////////////// // padding around path bounds to allow for antialiased pixels static const SkScalar kAntiAliasPad = 1.0f; class AADistanceFieldPathBatch : public GrVertexBatch { public: DEFINE_BATCH_CLASS_ID typedef GrAADistanceFieldPathRenderer::ShapeData ShapeData; typedef SkTDynamicHash ShapeCache; typedef GrAADistanceFieldPathRenderer::ShapeDataList ShapeDataList; AADistanceFieldPathBatch(GrColor color, const GrShape& shape, bool antiAlias, const SkMatrix& viewMatrix, GrBatchAtlas* atlas, ShapeCache* shapeCache, ShapeDataList* shapeList, bool gammaCorrect) : INHERITED(ClassID()) { SkASSERT(shape.hasUnstyledKey()); fBatch.fViewMatrix = viewMatrix; fGeoData.emplace_back(Geometry{color, shape, antiAlias}); fAtlas = atlas; fShapeCache = shapeCache; fShapeList = shapeList; fGammaCorrect = gammaCorrect; // Compute bounds this->setTransformedBounds(shape.bounds(), viewMatrix, HasAABloat::kYes, IsZeroArea::kNo); // There is currently an issue where we may produce 2 pixels worth of AA around the path. // A workaround is to outset the bounds by 1 in device space. (skbug.com/5989) SkRect bounds = this->bounds(); bounds.outset(1.f, 1.f); this->setBounds(bounds, HasAABloat::kYes, IsZeroArea::kNo); } const char* name() const override { return "AADistanceFieldPathBatch"; } void computePipelineOptimizations(GrInitInvariantOutput* color, GrInitInvariantOutput* coverage, GrBatchToXPOverrides* overrides) const override { color->setKnownFourComponents(fGeoData[0].fColor); coverage->setUnknownSingleComponent(); } private: void initBatchTracker(const GrXPOverridesForBatch& overrides) override { // Handle any color overrides if (!overrides.readsColor()) { fGeoData[0].fColor = GrColor_ILLEGAL; } overrides.getOverrideColorIfSet(&fGeoData[0].fColor); // setup batch properties fBatch.fColorIgnored = !overrides.readsColor(); fBatch.fUsesLocalCoords = overrides.readsLocalCoords(); fBatch.fCoverageIgnored = !overrides.readsCoverage(); } struct FlushInfo { sk_sp fVertexBuffer; sk_sp fIndexBuffer; sk_sp fGeometryProcessor; int fVertexOffset; int fInstancesToFlush; }; void onPrepareDraws(Target* target) const override { int instanceCount = fGeoData.count(); SkMatrix invert; if (this->usesLocalCoords() && !this->viewMatrix().invert(&invert)) { SkDebugf("Could not invert viewmatrix\n"); return; } const SkMatrix& ctm = this->viewMatrix(); uint32_t flags = 0; flags |= ctm.isScaleTranslate() ? kScaleOnly_DistanceFieldEffectFlag : 0; flags |= ctm.isSimilarity() ? kSimilarity_DistanceFieldEffectFlag : 0; flags |= fGammaCorrect ? kGammaCorrect_DistanceFieldEffectFlag : 0; GrSamplerParams params(SkShader::kRepeat_TileMode, GrSamplerParams::kBilerp_FilterMode); FlushInfo flushInfo; // Setup GrGeometryProcessor GrBatchAtlas* atlas = fAtlas; flushInfo.fGeometryProcessor = GrDistanceFieldPathGeoProc::Make(this->color(), this->viewMatrix(), atlas->getTexture(), params, flags, this->usesLocalCoords()); // allocate vertices size_t vertexStride = flushInfo.fGeometryProcessor->getVertexStride(); SkASSERT(vertexStride == 2 * sizeof(SkPoint) + sizeof(GrColor)); const GrBuffer* vertexBuffer; void* vertices = target->makeVertexSpace(vertexStride, kVerticesPerQuad * instanceCount, &vertexBuffer, &flushInfo.fVertexOffset); flushInfo.fVertexBuffer.reset(SkRef(vertexBuffer)); flushInfo.fIndexBuffer.reset(target->resourceProvider()->refQuadIndexBuffer()); if (!vertices || !flushInfo.fIndexBuffer) { SkDebugf("Could not allocate vertices\n"); return; } flushInfo.fInstancesToFlush = 0; // Pointer to the next set of vertices to write. intptr_t offset = reinterpret_cast(vertices); for (int i = 0; i < instanceCount; i++) { const Geometry& args = fGeoData[i]; // get mip level SkScalar maxScale = this->viewMatrix().getMaxScale(); const SkRect& bounds = args.fShape.bounds(); SkScalar maxDim = SkMaxScalar(bounds.width(), bounds.height()); SkScalar size = maxScale * maxDim; uint32_t desiredDimension; if (size <= kSmallMIP) { desiredDimension = kSmallMIP; } else if (size <= kMediumMIP) { desiredDimension = kMediumMIP; } else { desiredDimension = kLargeMIP; } // check to see if path is cached ShapeData::Key key(args.fShape, desiredDimension); ShapeData* shapeData = fShapeCache->find(key); if (nullptr == shapeData || !atlas->hasID(shapeData->fID)) { // Remove the stale cache entry if (shapeData) { fShapeCache->remove(shapeData->fKey); fShapeList->remove(shapeData); delete shapeData; } SkScalar scale = desiredDimension/maxDim; shapeData = new ShapeData; if (!this->addPathToAtlas(target, &flushInfo, atlas, shapeData, args.fShape, args.fAntiAlias, desiredDimension, scale)) { delete shapeData; SkDebugf("Can't rasterize path\n"); continue; } } atlas->setLastUseToken(shapeData->fID, target->nextDrawToken()); this->writePathVertices(target, atlas, offset, args.fColor, vertexStride, this->viewMatrix(), shapeData); offset += kVerticesPerQuad * vertexStride; flushInfo.fInstancesToFlush++; } this->flush(target, &flushInfo); } bool addPathToAtlas(GrVertexBatch::Target* target, FlushInfo* flushInfo, GrBatchAtlas* atlas, ShapeData* shapeData, const GrShape& shape, bool antiAlias, uint32_t dimension, SkScalar scale) const { const SkRect& bounds = shape.bounds(); // generate bounding rect for bitmap draw SkRect scaledBounds = bounds; // scale to mip level size scaledBounds.fLeft *= scale; scaledBounds.fTop *= scale; scaledBounds.fRight *= scale; scaledBounds.fBottom *= scale; // move the origin to an integer boundary (gives better results) SkScalar dx = SkScalarFraction(scaledBounds.fLeft); SkScalar dy = SkScalarFraction(scaledBounds.fTop); scaledBounds.offset(-dx, -dy); // get integer boundary SkIRect devPathBounds; scaledBounds.roundOut(&devPathBounds); // pad to allow room for antialiasing const int intPad = SkScalarCeilToInt(kAntiAliasPad); // pre-move origin (after outset, will be 0,0) int width = devPathBounds.width(); int height = devPathBounds.height(); devPathBounds.fLeft = intPad; devPathBounds.fTop = intPad; devPathBounds.fRight = intPad + width; devPathBounds.fBottom = intPad + height; devPathBounds.outset(intPad, intPad); // draw path to bitmap SkMatrix drawMatrix; drawMatrix.setTranslate(-bounds.left(), -bounds.top()); drawMatrix.postScale(scale, scale); drawMatrix.postTranslate(kAntiAliasPad, kAntiAliasPad); // setup bitmap backing SkASSERT(devPathBounds.fLeft == 0); SkASSERT(devPathBounds.fTop == 0); SkAutoPixmapStorage dst; if (!dst.tryAlloc(SkImageInfo::MakeA8(devPathBounds.width(), devPathBounds.height()))) { return false; } sk_bzero(dst.writable_addr(), dst.getSafeSize()); // rasterize path SkPaint paint; paint.setStyle(SkPaint::kFill_Style); paint.setAntiAlias(antiAlias); SkDraw draw; sk_bzero(&draw, sizeof(draw)); SkRasterClip rasterClip; rasterClip.setRect(devPathBounds); draw.fRC = &rasterClip; draw.fMatrix = &drawMatrix; draw.fDst = dst; SkPath path; shape.asPath(&path); draw.drawPathCoverage(path, paint); // generate signed distance field devPathBounds.outset(SK_DistanceFieldPad, SK_DistanceFieldPad); width = devPathBounds.width(); height = devPathBounds.height(); // TODO We should really generate this directly into the plot somehow SkAutoSMalloc<1024> dfStorage(width * height * sizeof(unsigned char)); // Generate signed distance field SkGenerateDistanceFieldFromA8Image((unsigned char*)dfStorage.get(), (const unsigned char*)dst.addr(), dst.width(), dst.height(), dst.rowBytes()); // add to atlas SkIPoint16 atlasLocation; GrBatchAtlas::AtlasID id; if (!atlas->addToAtlas(&id, target, width, height, dfStorage.get(), &atlasLocation)) { this->flush(target, flushInfo); if (!atlas->addToAtlas(&id, target, width, height, dfStorage.get(), &atlasLocation)) { return false; } } // add to cache shapeData->fKey.set(shape, dimension); shapeData->fScale = scale; shapeData->fID = id; // change the scaled rect to match the size of the inset distance field scaledBounds.fRight = scaledBounds.fLeft + SkIntToScalar(devPathBounds.width() - 2*SK_DistanceFieldInset); scaledBounds.fBottom = scaledBounds.fTop + SkIntToScalar(devPathBounds.height() - 2*SK_DistanceFieldInset); // shift the origin to the correct place relative to the distance field // need to also restore the fractional translation scaledBounds.offset(-SkIntToScalar(SK_DistanceFieldInset) - kAntiAliasPad + dx, -SkIntToScalar(SK_DistanceFieldInset) - kAntiAliasPad + dy); shapeData->fBounds = scaledBounds; // origin we render from is inset from distance field edge atlasLocation.fX += SK_DistanceFieldInset; atlasLocation.fY += SK_DistanceFieldInset; shapeData->fAtlasLocation = atlasLocation; fShapeCache->add(shapeData); fShapeList->addToTail(shapeData); #ifdef DF_PATH_TRACKING ++g_NumCachedPaths; #endif return true; } void writePathVertices(GrDrawBatch::Target* target, GrBatchAtlas* atlas, intptr_t offset, GrColor color, size_t vertexStride, const SkMatrix& viewMatrix, const ShapeData* shapeData) const { GrTexture* texture = atlas->getTexture(); SkScalar dx = shapeData->fBounds.fLeft; SkScalar dy = shapeData->fBounds.fTop; SkScalar width = shapeData->fBounds.width(); SkScalar height = shapeData->fBounds.height(); SkScalar invScale = 1.0f / shapeData->fScale; dx *= invScale; dy *= invScale; width *= invScale; height *= invScale; SkPoint* positions = reinterpret_cast(offset); // vertex positions // TODO make the vertex attributes a struct SkRect r = SkRect::MakeXYWH(dx, dy, width, height); positions->setRectFan(r.left(), r.top(), r.right(), r.bottom(), vertexStride); // colors for (int i = 0; i < kVerticesPerQuad; i++) { GrColor* colorPtr = (GrColor*)(offset + sizeof(SkPoint) + i * vertexStride); *colorPtr = color; } const SkScalar tx = SkIntToScalar(shapeData->fAtlasLocation.fX); const SkScalar ty = SkIntToScalar(shapeData->fAtlasLocation.fY); // vertex texture coords SkPoint* textureCoords = (SkPoint*)(offset + sizeof(SkPoint) + sizeof(GrColor)); textureCoords->setRectFan(tx / texture->width(), ty / texture->height(), (tx + shapeData->fBounds.width()) / texture->width(), (ty + shapeData->fBounds.height()) / texture->height(), vertexStride); } void flush(GrVertexBatch::Target* target, FlushInfo* flushInfo) const { if (flushInfo->fInstancesToFlush) { GrMesh mesh; int maxInstancesPerDraw = static_cast(flushInfo->fIndexBuffer->gpuMemorySize() / sizeof(uint16_t) / 6); mesh.initInstanced(kTriangles_GrPrimitiveType, flushInfo->fVertexBuffer.get(), flushInfo->fIndexBuffer.get(), flushInfo->fVertexOffset, kVerticesPerQuad, kIndicesPerQuad, flushInfo->fInstancesToFlush, maxInstancesPerDraw); target->draw(flushInfo->fGeometryProcessor.get(), mesh); flushInfo->fVertexOffset += kVerticesPerQuad * flushInfo->fInstancesToFlush; flushInfo->fInstancesToFlush = 0; } } GrColor color() const { return fGeoData[0].fColor; } const SkMatrix& viewMatrix() const { return fBatch.fViewMatrix; } bool usesLocalCoords() const { return fBatch.fUsesLocalCoords; } bool onCombineIfPossible(GrBatch* t, const GrCaps& caps) override { AADistanceFieldPathBatch* that = t->cast(); if (!GrPipeline::CanCombine(*this->pipeline(), this->bounds(), *that->pipeline(), that->bounds(), caps)) { return false; } // TODO We can position on the cpu if (!this->viewMatrix().cheapEqualTo(that->viewMatrix())) { return false; } fGeoData.push_back_n(that->fGeoData.count(), that->fGeoData.begin()); this->joinBounds(*that); return true; } struct BatchTracker { SkMatrix fViewMatrix; bool fUsesLocalCoords; bool fColorIgnored; bool fCoverageIgnored; }; struct Geometry { GrColor fColor; GrShape fShape; bool fAntiAlias; }; BatchTracker fBatch; SkSTArray<1, Geometry> fGeoData; GrBatchAtlas* fAtlas; ShapeCache* fShapeCache; ShapeDataList* fShapeList; bool fGammaCorrect; typedef GrVertexBatch INHERITED; }; bool GrAADistanceFieldPathRenderer::onDrawPath(const DrawPathArgs& args) { GR_AUDIT_TRAIL_AUTO_FRAME(args.fRenderTargetContext->auditTrail(), "GrAADistanceFieldPathRenderer::onDrawPath"); SkASSERT(!args.fRenderTargetContext->isUnifiedMultisampled()); SkASSERT(args.fShape->style().isSimpleFill()); // we've already bailed on inverse filled paths, so this is safe SkASSERT(!args.fShape->isEmpty()); SkASSERT(args.fShape->hasUnstyledKey()); if (!fAtlas) { fAtlas = args.fResourceProvider->makeAtlas(kAlpha_8_GrPixelConfig, ATLAS_TEXTURE_WIDTH, ATLAS_TEXTURE_HEIGHT, NUM_PLOTS_X, NUM_PLOTS_Y, &GrAADistanceFieldPathRenderer::HandleEviction, (void*)this); if (!fAtlas) { return false; } } sk_sp batch(new AADistanceFieldPathBatch(args.fPaint->getColor(), *args.fShape, args.fAntiAlias, *args.fViewMatrix, fAtlas.get(), &fShapeCache, &fShapeList, args.fGammaCorrect)); GrPipelineBuilder pipelineBuilder(*args.fPaint); pipelineBuilder.setUserStencil(args.fUserStencilSettings); args.fRenderTargetContext->drawBatch(pipelineBuilder, *args.fClip, batch.get()); return true; } /////////////////////////////////////////////////////////////////////////////////////////////////// #ifdef GR_TEST_UTILS struct PathTestStruct { typedef GrAADistanceFieldPathRenderer::ShapeCache ShapeCache; typedef GrAADistanceFieldPathRenderer::ShapeData ShapeData; typedef GrAADistanceFieldPathRenderer::ShapeDataList ShapeDataList; PathTestStruct() : fContextID(SK_InvalidGenID), fAtlas(nullptr) {} ~PathTestStruct() { this->reset(); } void reset() { ShapeDataList::Iter iter; iter.init(fShapeList, ShapeDataList::Iter::kHead_IterStart); ShapeData* shapeData; while ((shapeData = iter.get())) { iter.next(); fShapeList.remove(shapeData); delete shapeData; } fAtlas = nullptr; fShapeCache.reset(); } static void HandleEviction(GrBatchAtlas::AtlasID id, void* pr) { PathTestStruct* dfpr = (PathTestStruct*)pr; // remove any paths that use this plot ShapeDataList::Iter iter; iter.init(dfpr->fShapeList, ShapeDataList::Iter::kHead_IterStart); ShapeData* shapeData; while ((shapeData = iter.get())) { iter.next(); if (id == shapeData->fID) { dfpr->fShapeCache.remove(shapeData->fKey); dfpr->fShapeList.remove(shapeData); delete shapeData; } } } uint32_t fContextID; std::unique_ptr fAtlas; ShapeCache fShapeCache; ShapeDataList fShapeList; }; DRAW_BATCH_TEST_DEFINE(AADistanceFieldPathBatch) { static PathTestStruct gTestStruct; if (context->uniqueID() != gTestStruct.fContextID) { gTestStruct.fContextID = context->uniqueID(); gTestStruct.reset(); gTestStruct.fAtlas = context->resourceProvider()->makeAtlas(kAlpha_8_GrPixelConfig, ATLAS_TEXTURE_WIDTH, ATLAS_TEXTURE_HEIGHT, NUM_PLOTS_X, NUM_PLOTS_Y, &PathTestStruct::HandleEviction, (void*)&gTestStruct); } SkMatrix viewMatrix = GrTest::TestMatrix(random); GrColor color = GrRandomColor(random); bool gammaCorrect = random->nextBool(); // This path renderer only allows fill styles. GrShape shape(GrTest::TestPath(random), GrStyle::SimpleFill()); bool antiAlias = random->nextBool(); return new AADistanceFieldPathBatch(color, shape, antiAlias, viewMatrix, gTestStruct.fAtlas.get(), &gTestStruct.fShapeCache, &gTestStruct.fShapeList, gammaCorrect); } #endif