skia2/gm/convexpolyeffect.cpp

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/*
* 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"
#if SK_SUPPORT_GPU
#include "GrContext.h"
#include "GrDefaultGeoProcFactory.h"
#include "GrDrawContextPriv.h"
#include "GrPathUtils.h"
#include "GrTest.h"
#include "SkColorPriv.h"
#include "SkGeometry.h"
#include "SkTLList.h"
#include "batches/GrTestBatch.h"
#include "batches/GrVertexBatch.h"
#include "effects/GrConvexPolyEffect.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 PolyBoundsBatch : public GrTestBatch {
public:
DEFINE_BATCH_CLASS_ID
const char* name() const override { return "PolyBoundsBatch"; }
PolyBoundsBatch(const SkRect& rect, GrColor color)
: INHERITED(ClassID(), outset(sorted_rect(rect)), color)
, fRect(outset(rect)) {
}
private:
void onPrepareDraws(Target* target) const override {
using namespace GrDefaultGeoProcFactory;
Color color(this->color());
Coverage coverage(Coverage::kSolid_Type);
LocalCoords localCoords(LocalCoords::kUnused_Type);
sk_sp<GrGeometryProcessor> gp(
GrDefaultGeoProcFactory::Make(color, coverage, localCoords, SkMatrix::I()));
size_t vertexStride = gp->getVertexStride();
SkASSERT(vertexStride == sizeof(SkPoint));
QuadHelper helper;
SkPoint* verts = reinterpret_cast<SkPoint*>(helper.init(target, vertexStride, 1));
if (!verts) {
return;
}
fRect.toQuad(verts);
helper.recordDraw(target, gp.get());
}
SkRect fRect;
typedef GrTestBatch 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;
static const 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 {
GrDrawContext* drawContext = canvas->internal_private_accessTopLayerDrawContext();
if (!drawContext) {
skiagm::GM::DrawGpuOnlyMessage(canvas);
return;
}
SkScalar y = 0;
static const 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 < kGrProcessorEdgeTypeCnt; ++et) {
const SkMatrix m = SkMatrix::MakeTrans(x, y);
SkPath p;
path->transform(m, &p);
GrPrimitiveEdgeType edgeType = (GrPrimitiveEdgeType) et;
sk_sp<GrFragmentProcessor> fp(GrConvexPolyEffect::Make(edgeType, p));
if (!fp) {
continue;
}
GrPipelineBuilder pipelineBuilder;
pipelineBuilder.setXPFactory(GrPorterDuffXPFactory::Make(SkXfermode::kSrc_Mode));
pipelineBuilder.addCoverageFragmentProcessor(std::move(fp));
SkAutoTUnref<GrDrawBatch> batch(new PolyBoundsBatch(p.getBounds(), 0xff000000));
drawContext->drawContextPriv().testingOnly_drawBatch(pipelineBuilder, batch);
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 < kGrProcessorEdgeTypeCnt; ++et) {
SkRect rect = *iter.get();
rect.offset(x, y);
GrPrimitiveEdgeType edgeType = (GrPrimitiveEdgeType) et;
sk_sp<GrFragmentProcessor> fp(GrConvexPolyEffect::Make(edgeType, rect));
if (!fp) {
continue;
}
GrPipelineBuilder pipelineBuilder;
pipelineBuilder.setXPFactory(GrPorterDuffXPFactory::Make(SkXfermode::kSrc_Mode));
pipelineBuilder.addCoverageFragmentProcessor(std::move(fp));
SkAutoTUnref<GrDrawBatch> batch(new PolyBoundsBatch(rect, 0xff000000));
drawContext->drawContextPriv().testingOnly_drawBatch(pipelineBuilder, batch);
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;)
}
#endif