gm/convexpolyeffect.cpp - skia - Git at Google

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 // This test only works with the GPU backend.

 #include "gm.h"

 #include "GrContext.h"
 #include "GrDefaultGeoProcFactory.h"
 #include "GrMemoryPool.h"
 #include "GrOpFlushState.h"
 #include "GrPathUtils.h"
 #include "GrRenderTargetContextPriv.h"
 #include "SkColorPriv.h"
 #include "SkGeometry.h"
 #include "SkPointPriv.h"
 #include "SkTLList.h"
 #include "effects/GrConvexPolyEffect.h"
 #include "ops/GrMeshDrawOp.h"

 /** outset rendered rect to visualize anti-aliased poly edges */
 static SkRect outset(const SkRect& unsorted) {
     SkRect r = unsorted;
     r.outset(5.f, 5.f);
     return r;
 }

 /** sorts a rect */
 static SkRect sorted_rect(const SkRect& unsorted) {
     SkRect r = unsorted;
     r.sort();
     return r;
 }

 namespace skiagm {
 class PolyBoundsOp : public GrMeshDrawOp {
 public:
     DEFINE_OP_CLASS_ID

     static std::unique_ptr<GrDrawOp> Make(GrContext* context,
                                           GrPaint&& paint,
                                           const SkRect& rect) {
         GrOpMemoryPool* pool = context->contextPriv().opMemoryPool();

         return pool->allocate<PolyBoundsOp>(std::move(paint), rect);
     }

     const char* name() const override { return "PolyBoundsOp"; }

     void visitProxies(const VisitProxyFunc& func) const override {
         fProcessors.visitProxies(func);
     }

     FixedFunctionFlags fixedFunctionFlags() const override { return FixedFunctionFlags::kNone; }

     RequiresDstTexture finalize(const GrCaps& caps, const GrAppliedClip* clip) override {
         auto analysis = fProcessors.finalize(fColor, GrProcessorAnalysisCoverage::kNone, clip,
                                              false, caps, &fColor);
         return analysis.requiresDstTexture() ? RequiresDstTexture::kYes : RequiresDstTexture::kNo;
     }

 private:
     friend class ::GrOpMemoryPool; // for ctor

     PolyBoundsOp(GrPaint&& paint, const SkRect& rect)
             : INHERITED(ClassID())
             , fColor(paint.getColor())
             , fProcessors(std::move(paint))
             , fRect(outset(rect)) {
         this->setBounds(sorted_rect(fRect), HasAABloat::kNo, IsZeroArea::kNo);
     }

     void onPrepareDraws(Target* target) override {
         using namespace GrDefaultGeoProcFactory;

         Color color(fColor);
         sk_sp<GrGeometryProcessor> gp(GrDefaultGeoProcFactory::Make(
                 target->caps().shaderCaps(),
                 color,
                 Coverage::kSolid_Type,
                 LocalCoords::kUnused_Type,
                 SkMatrix::I()));

         SkASSERT(gp->debugOnly_vertexStride() == sizeof(SkPoint));
         QuadHelper helper(target, sizeof(SkPoint), 1);
         SkPoint* verts = reinterpret_cast<SkPoint*>(helper.vertices());
         if (!verts) {
             return;
         }

         SkPointPriv::SetRectTriStrip(verts, fRect, sizeof(SkPoint));

         auto pipe = target->makePipeline(0, std::move(fProcessors), target->detachAppliedClip());
         helper.recordDraw(target, std::move(gp), pipe.fPipeline, pipe.fFixedDynamicState);
     }

     GrColor fColor;
     GrProcessorSet fProcessors;
     SkRect fRect;

     typedef GrMeshDrawOp INHERITED;
 };

 /**
  * This GM directly exercises a GrProcessor that draws convex polygons.
  */
 class ConvexPolyEffect : public GM {
 public:
     ConvexPolyEffect() {
         this->setBGColor(0xFFFFFFFF);
     }

 protected:
     SkString onShortName() override {
         return SkString("convex_poly_effect");
     }

     SkISize onISize() override {
         return SkISize::Make(720, 800);
     }

     void onOnceBeforeDraw() override {
         SkPath tri;
         tri.moveTo(5.f, 5.f);
         tri.lineTo(100.f, 20.f);
         tri.lineTo(15.f, 100.f);

         fPaths.addToTail(tri);
         fPaths.addToTail(SkPath())->reverseAddPath(tri);

         tri.close();
         fPaths.addToTail(tri);

         SkPath ngon;
         constexpr SkScalar kRadius = 50.f;
         const SkPoint center = { kRadius, kRadius };
         for (int i = 0; i < GrConvexPolyEffect::kMaxEdges; ++i) {
             SkScalar angle = 2 * SK_ScalarPI * i / GrConvexPolyEffect::kMaxEdges;
             SkPoint point;
             point.fY = SkScalarSinCos(angle, &point.fX);
             point.scale(kRadius);
             point = center + point;
             if (0 == i) {
                 ngon.moveTo(point);
             } else {
                 ngon.lineTo(point);
             }
         }

         fPaths.addToTail(ngon);
         SkMatrix scaleM;
         scaleM.setScale(1.1f, 0.4f);
         ngon.transform(scaleM);
         fPaths.addToTail(ngon);

         SkPath linePath;
         linePath.moveTo(5.f, 5.f);
         linePath.lineTo(6.f, 6.f);
         fPaths.addToTail(linePath);

         // integer edges
         fRects.addToTail(SkRect::MakeLTRB(5.f, 1.f, 30.f, 25.f));
         // half-integer edges
         fRects.addToTail(SkRect::MakeLTRB(5.5f, 0.5f, 29.5f, 24.5f));
         // vertically/horizontally thin rects that cover pixel centers
         fRects.addToTail(SkRect::MakeLTRB(5.25f, 0.5f, 5.75f, 24.5f));
         fRects.addToTail(SkRect::MakeLTRB(5.5f,  0.5f, 29.5f, 0.75f));
         // vertically/horizontally thin rects that don't cover pixel centers
         fRects.addToTail(SkRect::MakeLTRB(5.55f, 0.5f, 5.75f, 24.5f));
         fRects.addToTail(SkRect::MakeLTRB(5.5f, .05f, 29.5f, .25f));
         // small in x and y
         fRects.addToTail(SkRect::MakeLTRB(5.05f, .55f, 5.45f, .85f));
         // inverted in x and y
         fRects.addToTail(SkRect::MakeLTRB(100.f, 50.5f, 5.f, 0.5f));
     }

     void onDraw(SkCanvas* canvas) override {
         GrRenderTargetContext* renderTargetContext =
             canvas->internal_private_accessTopLayerRenderTargetContext();
         if (!renderTargetContext) {
             skiagm::GM::DrawGpuOnlyMessage(canvas);
             return;
         }

         GrContext* context = canvas->getGrContext();
         if (!context) {
             return;
         }

         SkScalar y = 0;
         constexpr SkScalar kDX = 12.f;
         for (PathList::Iter iter(fPaths, PathList::Iter::kHead_IterStart);
              iter.get();
              iter.next()) {
             const SkPath* path = iter.get();
             SkScalar x = 0;

             for (int et = 0; et < kGrClipEdgeTypeCnt; ++et) {
                 const SkMatrix m = SkMatrix::MakeTrans(x, y);
                 SkPath p;
                 path->transform(m, &p);

                 GrClipEdgeType edgeType = (GrClipEdgeType) et;
                 std::unique_ptr<GrFragmentProcessor> fp(GrConvexPolyEffect::Make(edgeType, p));
                 if (!fp) {
                     continue;
                 }

                 GrPaint grPaint;
                 grPaint.setColor4f(GrColor4f(0, 0, 0, 1.f));
                 grPaint.setXPFactory(GrPorterDuffXPFactory::Get(SkBlendMode::kSrc));
                 grPaint.addCoverageFragmentProcessor(std::move(fp));

                 std::unique_ptr<GrDrawOp> op =
                         PolyBoundsOp::Make(context, std::move(grPaint), p.getBounds());
                 renderTargetContext->priv().testingOnly_addDrawOp(std::move(op));

                 x += SkScalarCeilToScalar(path->getBounds().width() + kDX);
             }

             // Draw AA and non AA paths using normal API for reference.
             canvas->save();
             canvas->translate(x, y);
             SkPaint paint;
             canvas->drawPath(*path, paint);
             canvas->translate(path->getBounds().width() + 10.f, 0);
             paint.setAntiAlias(true);
             canvas->drawPath(*path, paint);
             canvas->restore();

             y += SkScalarCeilToScalar(path->getBounds().height() + 20.f);
         }

         for (RectList::Iter iter(fRects, RectList::Iter::kHead_IterStart);
              iter.get();
              iter.next()) {

             SkScalar x = 0;

             for (int et = 0; et < kGrClipEdgeTypeCnt; ++et) {
                 SkRect rect = *iter.get();
                 rect.offset(x, y);
                 GrClipEdgeType edgeType = (GrClipEdgeType) et;
                 std::unique_ptr<GrFragmentProcessor> fp(GrConvexPolyEffect::Make(edgeType, rect));
                 if (!fp) {
                     continue;
                 }

                 GrPaint grPaint;
                 grPaint.setColor4f(GrColor4f(0, 0, 0, 1.f));
                 grPaint.setXPFactory(GrPorterDuffXPFactory::Get(SkBlendMode::kSrc));
                 grPaint.addCoverageFragmentProcessor(std::move(fp));

                 std::unique_ptr<GrDrawOp> op = PolyBoundsOp::Make(context, std::move(grPaint),
                                                                   rect);
                 renderTargetContext->priv().testingOnly_addDrawOp(std::move(op));

                 x += SkScalarCeilToScalar(rect.width() + kDX);
             }

             // Draw rect without and with AA using normal API for reference
             canvas->save();
             canvas->translate(x, y);
             SkPaint paint;
             canvas->drawRect(*iter.get(), paint);
             x += SkScalarCeilToScalar(iter.get()->width() + kDX);
             paint.setAntiAlias(true);
             canvas->drawRect(*iter.get(), paint);
             canvas->restore();

             y += SkScalarCeilToScalar(iter.get()->height() + 20.f);
         }
     }

 private:
     typedef SkTLList<SkPath, 1> PathList;
     typedef SkTLList<SkRect, 1> RectList;
     PathList fPaths;
     RectList fRects;

     typedef GM INHERITED;
 };

 DEF_GM(return new ConvexPolyEffect;)
 }
	/*
	* Copyright 2014 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	// This test only works with the GPU backend.

	#include "gm.h"

	#include "GrContext.h"
	#include "GrDefaultGeoProcFactory.h"
	#include "GrMemoryPool.h"
	#include "GrOpFlushState.h"
	#include "GrPathUtils.h"
	#include "GrRenderTargetContextPriv.h"
	#include "SkColorPriv.h"
	#include "SkGeometry.h"
	#include "SkPointPriv.h"
	#include "SkTLList.h"
	#include "effects/GrConvexPolyEffect.h"
	#include "ops/GrMeshDrawOp.h"

	/** outset rendered rect to visualize anti-aliased poly edges */
	static SkRect outset(const SkRect& unsorted) {
	SkRect r = unsorted;
	r.outset(5.f, 5.f);
	return r;
	}

	/** sorts a rect */
	static SkRect sorted_rect(const SkRect& unsorted) {
	SkRect r = unsorted;
	r.sort();
	return r;
	}

	namespace skiagm {
	class PolyBoundsOp : public GrMeshDrawOp {
	public:
	DEFINE_OP_CLASS_ID

	static std::unique_ptr<GrDrawOp> Make(GrContext* context,
	GrPaint&& paint,
	const SkRect& rect) {
	GrOpMemoryPool* pool = context->contextPriv().opMemoryPool();

	return pool->allocate<PolyBoundsOp>(std::move(paint), rect);
	}

	const char* name() const override { return "PolyBoundsOp"; }

	void visitProxies(const VisitProxyFunc& func) const override {
	fProcessors.visitProxies(func);
	}

	FixedFunctionFlags fixedFunctionFlags() const override { return FixedFunctionFlags::kNone; }

	RequiresDstTexture finalize(const GrCaps& caps, const GrAppliedClip* clip) override {
	auto analysis = fProcessors.finalize(fColor, GrProcessorAnalysisCoverage::kNone, clip,
	false, caps, &fColor);
	return analysis.requiresDstTexture() ? RequiresDstTexture::kYes : RequiresDstTexture::kNo;
	}

	private:
	friend class ::GrOpMemoryPool; // for ctor

	PolyBoundsOp(GrPaint&& paint, const SkRect& rect)
	: INHERITED(ClassID())
	, fColor(paint.getColor())
	, fProcessors(std::move(paint))
	, fRect(outset(rect)) {
	this->setBounds(sorted_rect(fRect), HasAABloat::kNo, IsZeroArea::kNo);
	}

	void onPrepareDraws(Target* target) override {
	using namespace GrDefaultGeoProcFactory;

	Color color(fColor);
	sk_sp<GrGeometryProcessor> gp(GrDefaultGeoProcFactory::Make(
	target->caps().shaderCaps(),
	color,
	Coverage::kSolid_Type,
	LocalCoords::kUnused_Type,
	SkMatrix::I()));

	SkASSERT(gp->debugOnly_vertexStride() == sizeof(SkPoint));
	QuadHelper helper(target, sizeof(SkPoint), 1);
	SkPoint* verts = reinterpret_cast<SkPoint*>(helper.vertices());
	if (!verts) {
	return;
	}

	SkPointPriv::SetRectTriStrip(verts, fRect, sizeof(SkPoint));

	auto pipe = target->makePipeline(0, std::move(fProcessors), target->detachAppliedClip());
	helper.recordDraw(target, std::move(gp), pipe.fPipeline, pipe.fFixedDynamicState);
	}

	GrColor fColor;
	GrProcessorSet fProcessors;
	SkRect fRect;

	typedef GrMeshDrawOp INHERITED;
	};

	/**
	* This GM directly exercises a GrProcessor that draws convex polygons.
	*/
	class ConvexPolyEffect : public GM {
	public:
	ConvexPolyEffect() {
	this->setBGColor(0xFFFFFFFF);
	}

	protected:
	SkString onShortName() override {
	return SkString("convex_poly_effect");
	}

	SkISize onISize() override {
	return SkISize::Make(720, 800);
	}

	void onOnceBeforeDraw() override {
	SkPath tri;
	tri.moveTo(5.f, 5.f);
	tri.lineTo(100.f, 20.f);
	tri.lineTo(15.f, 100.f);

	fPaths.addToTail(tri);
	fPaths.addToTail(SkPath())->reverseAddPath(tri);

	tri.close();
	fPaths.addToTail(tri);

	SkPath ngon;
	constexpr SkScalar kRadius = 50.f;
	const SkPoint center = { kRadius, kRadius };
	for (int i = 0; i < GrConvexPolyEffect::kMaxEdges; ++i) {
	SkScalar angle = 2 * SK_ScalarPI * i / GrConvexPolyEffect::kMaxEdges;
	SkPoint point;
	point.fY = SkScalarSinCos(angle, &point.fX);
	point.scale(kRadius);
	point = center + point;
	if (0 == i) {
	ngon.moveTo(point);
	} else {
	ngon.lineTo(point);
	}
	}

	fPaths.addToTail(ngon);
	SkMatrix scaleM;
	scaleM.setScale(1.1f, 0.4f);
	ngon.transform(scaleM);
	fPaths.addToTail(ngon);

	SkPath linePath;
	linePath.moveTo(5.f, 5.f);
	linePath.lineTo(6.f, 6.f);
	fPaths.addToTail(linePath);

	// integer edges
	fRects.addToTail(SkRect::MakeLTRB(5.f, 1.f, 30.f, 25.f));
	// half-integer edges
	fRects.addToTail(SkRect::MakeLTRB(5.5f, 0.5f, 29.5f, 24.5f));
	// vertically/horizontally thin rects that cover pixel centers
	fRects.addToTail(SkRect::MakeLTRB(5.25f, 0.5f, 5.75f, 24.5f));
	fRects.addToTail(SkRect::MakeLTRB(5.5f, 0.5f, 29.5f, 0.75f));
	// vertically/horizontally thin rects that don't cover pixel centers
	fRects.addToTail(SkRect::MakeLTRB(5.55f, 0.5f, 5.75f, 24.5f));
	fRects.addToTail(SkRect::MakeLTRB(5.5f, .05f, 29.5f, .25f));
	// small in x and y
	fRects.addToTail(SkRect::MakeLTRB(5.05f, .55f, 5.45f, .85f));
	// inverted in x and y
	fRects.addToTail(SkRect::MakeLTRB(100.f, 50.5f, 5.f, 0.5f));
	}

	void onDraw(SkCanvas* canvas) override {
	GrRenderTargetContext* renderTargetContext =
	canvas->internal_private_accessTopLayerRenderTargetContext();
	if (!renderTargetContext) {
	skiagm::GM::DrawGpuOnlyMessage(canvas);
	return;
	}

	GrContext* context = canvas->getGrContext();
	if (!context) {
	return;
	}

	SkScalar y = 0;
	constexpr SkScalar kDX = 12.f;
	for (PathList::Iter iter(fPaths, PathList::Iter::kHead_IterStart);
	iter.get();
	iter.next()) {
	const SkPath* path = iter.get();
	SkScalar x = 0;

	for (int et = 0; et < kGrClipEdgeTypeCnt; ++et) {
	const SkMatrix m = SkMatrix::MakeTrans(x, y);
	SkPath p;
	path->transform(m, &p);

	GrClipEdgeType edgeType = (GrClipEdgeType) et;
	std::unique_ptr<GrFragmentProcessor> fp(GrConvexPolyEffect::Make(edgeType, p));
	if (!fp) {
	continue;
	}

	GrPaint grPaint;
	grPaint.setColor4f(GrColor4f(0, 0, 0, 1.f));
	grPaint.setXPFactory(GrPorterDuffXPFactory::Get(SkBlendMode::kSrc));
	grPaint.addCoverageFragmentProcessor(std::move(fp));

	std::unique_ptr<GrDrawOp> op =
	PolyBoundsOp::Make(context, std::move(grPaint), p.getBounds());
	renderTargetContext->priv().testingOnly_addDrawOp(std::move(op));

	x += SkScalarCeilToScalar(path->getBounds().width() + kDX);
	}

	// Draw AA and non AA paths using normal API for reference.
	canvas->save();
	canvas->translate(x, y);
	SkPaint paint;
	canvas->drawPath(*path, paint);
	canvas->translate(path->getBounds().width() + 10.f, 0);
	paint.setAntiAlias(true);
	canvas->drawPath(*path, paint);
	canvas->restore();

	y += SkScalarCeilToScalar(path->getBounds().height() + 20.f);
	}

	for (RectList::Iter iter(fRects, RectList::Iter::kHead_IterStart);
	iter.get();
	iter.next()) {

	SkScalar x = 0;

	for (int et = 0; et < kGrClipEdgeTypeCnt; ++et) {
	SkRect rect = *iter.get();
	rect.offset(x, y);
	GrClipEdgeType edgeType = (GrClipEdgeType) et;
	std::unique_ptr<GrFragmentProcessor> fp(GrConvexPolyEffect::Make(edgeType, rect));
	if (!fp) {
	continue;
	}

	GrPaint grPaint;
	grPaint.setColor4f(GrColor4f(0, 0, 0, 1.f));
	grPaint.setXPFactory(GrPorterDuffXPFactory::Get(SkBlendMode::kSrc));
	grPaint.addCoverageFragmentProcessor(std::move(fp));

	std::unique_ptr<GrDrawOp> op = PolyBoundsOp::Make(context, std::move(grPaint),
	rect);
	renderTargetContext->priv().testingOnly_addDrawOp(std::move(op));

	x += SkScalarCeilToScalar(rect.width() + kDX);
	}

	// Draw rect without and with AA using normal API for reference
	canvas->save();
	canvas->translate(x, y);
	SkPaint paint;
	canvas->drawRect(*iter.get(), paint);
	x += SkScalarCeilToScalar(iter.get()->width() + kDX);
	paint.setAntiAlias(true);
	canvas->drawRect(*iter.get(), paint);
	canvas->restore();

	y += SkScalarCeilToScalar(iter.get()->height() + 20.f);
	}
	}

	private:
	typedef SkTLList<SkPath, 1> PathList;
	typedef SkTLList<SkRect, 1> RectList;
	PathList fPaths;
	RectList fRects;

	typedef GM INHERITED;
	};

	DEF_GM(return new ConvexPolyEffect;)
	}