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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 "GrPathUtils.h"
#include "GrTest.h"
#include "SkColorPriv.h"
#include "SkDevice.h"
#include "SkGeometry.h"
#include "SkTLList.h"
#include "effects/GrConvexPolyEffect.h"
namespace {
extern const GrVertexAttrib kAttribs[] = {
{kVec2f_GrVertexAttribType, 0, kPosition_GrVertexAttribBinding},
};
}
namespace skiagm {
/**
* This GM directly exercises a GrEffect that draws convex polygons.
*/
class ConvexPolyEffect : public GM {
public:
ConvexPolyEffect() {
this->setBGColor(0xFFFFFFFF);
}
protected:
virtual SkString onShortName() SK_OVERRIDE {
return SkString("convex_poly_effect");
}
virtual SkISize onISize() SK_OVERRIDE {
return make_isize(720, 800);
}
virtual uint32_t onGetFlags() const SK_OVERRIDE {
// This is a GPU-specific GM.
return kGPUOnly_Flag;
}
virtual void onOnceBeforeDraw() SK_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);
// 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));
}
virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
GrRenderTarget* rt = canvas->internal_private_accessTopLayerRenderTarget();
if (NULL == rt) {
return;
}
GrContext* context = rt->getContext();
if (NULL == context) {
return;
}
SkScalar y = 0;
for (SkTLList<SkPath>::Iter iter(fPaths, SkTLList<SkPath>::Iter::kHead_IterStart);
NULL != iter.get();
iter.next()) {
const SkPath* path = iter.get();
SkScalar x = 0;
for (int et = 0; et < kGrEffectEdgeTypeCnt; ++et) {
GrTestTarget tt;
context->getTestTarget(&tt);
if (NULL == tt.target()) {
SkDEBUGFAIL("Couldn't get Gr test target.");
return;
}
GrDrawState* drawState = tt.target()->drawState();
drawState->setVertexAttribs<kAttribs>(SK_ARRAY_COUNT(kAttribs));
SkMatrix m;
SkPath p;
m.setTranslate(x, y);
path->transform(m, &p);
GrEffectEdgeType edgeType = (GrEffectEdgeType) et;
SkAutoTUnref<GrEffectRef> effect(GrConvexPolyEffect::Create(edgeType, p));
if (!effect) {
continue;
}
drawState->addCoverageEffect(effect, 1);
drawState->setIdentityViewMatrix();
drawState->setRenderTarget(rt);
drawState->setColor(0xff000000);
SkPoint verts[4];
SkRect bounds = p.getBounds();
// Make sure any artifacts around the exterior of path are visible by using overly
// conservative bounding geometry.
bounds.outset(5.f, 5.f);
bounds.toQuad(verts);
tt.target()->setVertexSourceToArray(verts, 4);
tt.target()->setIndexSourceToBuffer(context->getQuadIndexBuffer());
tt.target()->drawIndexed(kTriangleFan_GrPrimitiveType, 0, 0, 4, 6);
x += SkScalarCeilToScalar(path->getBounds().width() + 10.f);
}
// 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 (SkTLList<SkRect>::Iter iter(fRects, SkTLList<SkRect>::Iter::kHead_IterStart);
NULL != iter.get();
iter.next()) {
SkScalar x = 0;
for (int et = 0; et < kGrEffectEdgeTypeCnt; ++et) {
GrTestTarget tt;
context->getTestTarget(&tt);
if (NULL == tt.target()) {
SkDEBUGFAIL("Couldn't get Gr test target.");
return;
}
SkRect rect = *iter.get();
rect.offset(x, y);
GrEffectEdgeType edgeType = (GrEffectEdgeType) et;
SkAutoTUnref<GrEffectRef> effect(GrConvexPolyEffect::Create(edgeType, rect));
if (!effect) {
continue;
}
GrDrawState* drawState = tt.target()->drawState();
drawState->setVertexAttribs<kAttribs>(SK_ARRAY_COUNT(kAttribs));
drawState->addCoverageEffect(effect, 1);
drawState->setIdentityViewMatrix();
drawState->setRenderTarget(rt);
drawState->setColor(0xff000000);
SkPoint verts[4];
SkRect bounds = rect;
bounds.outset(5.f, 5.f);
bounds.toQuad(verts);
tt.target()->setVertexSourceToArray(verts, 4);
tt.target()->setIndexSourceToBuffer(context->getQuadIndexBuffer());
tt.target()->drawIndexed(kTriangleFan_GrPrimitiveType, 0, 0, 4, 6);
x += SkScalarCeilToScalar(rect.width() + 10.f);
}
// 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() + 10.f);
paint.setAntiAlias(true);
canvas->drawRect(*iter.get(), paint);
canvas->restore();
y += SkScalarCeilToScalar(iter.get()->height() + 20.f);
}
}
private:
SkTLList<SkPath> fPaths;
SkTLList<SkRect> fRects;
typedef GM INHERITED;
};
DEF_GM( return SkNEW(ConvexPolyEffect); )
}
#endif
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