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skia2/gm/beziereffects.cpp
Hal Canary 23e474cb73 SkCanvas: Helpers for draw{Point,Line,Circle} 
Change-Id: Ie9c7d3b8f01aee435563b23b7d27f098f07dd287
Reviewed-on: https://skia-review.googlesource.com/16909
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
2017-05-16 12:59:11 +00:00

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/*
* Copyright 2013 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 "GrRenderTargetContextPriv.h"
#include "GrContext.h"
#include "GrPathUtils.h"
#include "GrTest.h"
#include "SkColorPriv.h"
#include "SkGeometry.h"
#include "ops/GrTestMeshDrawOp.h"
#include "effects/GrBezierEffect.h"
namespace skiagm {
class BezierCubicOrConicTestOp : public GrTestMeshDrawOp {
public:
DEFINE_OP_CLASS_ID
const char* name() const override { return "BezierCubicOrConicTestOp"; }
static std::unique_ptr<GrLegacyMeshDrawOp> Make(sk_sp<GrGeometryProcessor> gp,
const SkRect& rect, GrColor color,
const SkMatrix& klm, SkScalar sign) {
return std::unique_ptr<GrLegacyMeshDrawOp>(
new BezierCubicOrConicTestOp(gp, rect, color, klm, sign));
}
private:
BezierCubicOrConicTestOp(sk_sp<GrGeometryProcessor> gp, const SkRect& rect, GrColor color,
const SkMatrix& klm, SkScalar sign)
: INHERITED(ClassID(), rect, color)
, fKLM(klm)
, fRect(rect)
, fGeometryProcessor(std::move(gp)) {
if (1 != sign) {
fKLM.postScale(sign, sign);
}
}
struct Vertex {
SkPoint fPosition;
float fKLM[4]; // The last value is ignored. The effect expects a vec4f.
};
void onPrepareDraws(Target* target) const override {
QuadHelper helper;
size_t vertexStride = fGeometryProcessor->getVertexStride();
SkASSERT(vertexStride == sizeof(Vertex));
Vertex* verts = reinterpret_cast<Vertex*>(helper.init(target, vertexStride, 1));
if (!verts) {
return;
}
verts[0].fPosition.setRectFan(fRect.fLeft, fRect.fTop, fRect.fRight, fRect.fBottom,
sizeof(Vertex));
for (int v = 0; v < 4; ++v) {
SkScalar pt3[3] = {verts[v].fPosition.x(), verts[v].fPosition.y(), 1.f};
fKLM.mapHomogeneousPoints(verts[v].fKLM, pt3, 1);
}
helper.recordDraw(target, fGeometryProcessor.get(), this->pipeline());
}
SkMatrix fKLM;
SkRect fRect;
sk_sp<GrGeometryProcessor> fGeometryProcessor;
static constexpr int kVertsPerCubic = 4;
static constexpr int kIndicesPerCubic = 6;
typedef GrTestMeshDrawOp INHERITED;
};
/**
* This GM directly exercises effects that draw Bezier curves in the GPU backend.
*/
class BezierCubicEffects : public GM {
public:
BezierCubicEffects() {
this->setBGColor(0xFFFFFFFF);
}
protected:
SkString onShortName() override {
return SkString("bezier_cubic_effects");
}
SkISize onISize() override {
return SkISize::Make(800, 800);
}
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;
}
struct Vertex {
SkPoint fPosition;
float fKLM[4]; // The last value is ignored. The effect expects a vec4f.
};
constexpr int kNumCubics = 15;
SkRandom rand;
// Mult by 3 for each edge effect type
int numCols = SkScalarCeilToInt(SkScalarSqrt(SkIntToScalar(kNumCubics*3)));
int numRows = SkScalarCeilToInt(SkIntToScalar(kNumCubics*3) / numCols);
SkScalar w = SkIntToScalar(renderTargetContext->width()) / numCols;
SkScalar h = SkIntToScalar(renderTargetContext->height()) / numRows;
int row = 0;
int col = 0;
constexpr GrColor color = 0xff000000;
for (int i = 0; i < kNumCubics; ++i) {
SkPoint baseControlPts[] = {
{rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)},
{rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)},
{rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)},
{rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)}
};
for(int edgeType = 0; edgeType < kGrProcessorEdgeTypeCnt; ++edgeType) {
sk_sp<GrGeometryProcessor> gp;
GrPrimitiveEdgeType et = (GrPrimitiveEdgeType)edgeType;
gp = GrCubicEffect::Make(color, SkMatrix::I(), et, *context->caps());
if (!gp) {
continue;
}
SkScalar x = col * w;
SkScalar y = row * h;
SkPoint controlPts[] = {
{x + baseControlPts[0].fX, y + baseControlPts[0].fY},
{x + baseControlPts[1].fX, y + baseControlPts[1].fY},
{x + baseControlPts[2].fX, y + baseControlPts[2].fY},
{x + baseControlPts[3].fX, y + baseControlPts[3].fY}
};
SkPoint chopped[10];
SkMatrix klm;
int loopIndex;
int cnt = GrPathUtils::chopCubicAtLoopIntersection(controlPts,
chopped,
&klm,
&loopIndex);
SkPaint ctrlPtPaint;
ctrlPtPaint.setColor(rand.nextU() | 0xFF000000);
canvas->drawCircle(controlPts[0], 8.f, ctrlPtPaint);
for (int i = 1; i < 4; ++i) {
canvas->drawCircle(controlPts[i], 6.f, ctrlPtPaint);
}
SkPaint polyPaint;
polyPaint.setColor(0xffA0A0A0);
polyPaint.setStrokeWidth(0);
polyPaint.setStyle(SkPaint::kStroke_Style);
canvas->drawPoints(SkCanvas::kPolygon_PointMode, 4, controlPts, polyPaint);
SkPaint choppedPtPaint;
choppedPtPaint.setColor(~ctrlPtPaint.getColor() | 0xFF000000);
for (int c = 0; c < cnt; ++c) {
SkPoint* pts = chopped + 3 * c;
for (int i = 0; i < 4; ++i) {
canvas->drawCircle(pts[i], 3.f, choppedPtPaint);
}
SkRect bounds;
bounds.set(pts, 4);
SkPaint boundsPaint;
boundsPaint.setColor(0xff808080);
boundsPaint.setStrokeWidth(0);
boundsPaint.setStyle(SkPaint::kStroke_Style);
canvas->drawRect(bounds, boundsPaint);
GrPaint grPaint;
grPaint.setXPFactory(GrPorterDuffXPFactory::Get(SkBlendMode::kSrc));
SkScalar sign = 1.0f;
if (c == loopIndex && cnt != 3) {
sign = -1.0f;
}
std::unique_ptr<GrLegacyMeshDrawOp> op =
BezierCubicOrConicTestOp::Make(gp, bounds, color, klm, sign);
renderTargetContext->priv().testingOnly_addLegacyMeshDrawOp(
std::move(grPaint), GrAAType::kNone, std::move(op));
}
++col;
if (numCols == col) {
col = 0;
++row;
}
}
}
}
private:
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
/**
* This GM directly exercises effects that draw Bezier curves in the GPU backend.
*/
class BezierConicEffects : public GM {
public:
BezierConicEffects() {
this->setBGColor(0xFFFFFFFF);
}
protected:
SkString onShortName() override {
return SkString("bezier_conic_effects");
}
SkISize onISize() override {
return SkISize::Make(800, 800);
}
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;
}
struct Vertex {
SkPoint fPosition;
float fKLM[4]; // The last value is ignored. The effect expects a vec4f.
};
constexpr int kNumConics = 10;
SkRandom rand;
// Mult by 3 for each edge effect type
int numCols = SkScalarCeilToInt(SkScalarSqrt(SkIntToScalar(kNumConics*3)));
int numRows = SkScalarCeilToInt(SkIntToScalar(kNumConics*3) / numCols);
SkScalar w = SkIntToScalar(renderTargetContext->width()) / numCols;
SkScalar h = SkIntToScalar(renderTargetContext->height()) / numRows;
int row = 0;
int col = 0;
constexpr GrColor color = 0xff000000;
for (int i = 0; i < kNumConics; ++i) {
SkPoint baseControlPts[] = {
{rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)},
{rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)},
{rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)}
};
SkScalar weight = rand.nextRangeF(0.f, 2.f);
for(int edgeType = 0; edgeType < kGrProcessorEdgeTypeCnt; ++edgeType) {
sk_sp<GrGeometryProcessor> gp;
GrPrimitiveEdgeType et = (GrPrimitiveEdgeType)edgeType;
gp = GrConicEffect::Make(color, SkMatrix::I(), et,
*context->caps(), SkMatrix::I(), false);
if (!gp) {
continue;
}
SkScalar x = col * w;
SkScalar y = row * h;
SkPoint controlPts[] = {
{x + baseControlPts[0].fX, y + baseControlPts[0].fY},
{x + baseControlPts[1].fX, y + baseControlPts[1].fY},
{x + baseControlPts[2].fX, y + baseControlPts[2].fY}
};
SkConic dst[4];
SkMatrix klm;
int cnt = chop_conic(controlPts, dst, weight);
GrPathUtils::getConicKLM(controlPts, weight, &klm);
SkPaint ctrlPtPaint;
ctrlPtPaint.setColor(rand.nextU() | 0xFF000000);
for (int i = 0; i < 3; ++i) {
canvas->drawCircle(controlPts[i], 6.f, ctrlPtPaint);
}
SkPaint polyPaint;
polyPaint.setColor(0xffA0A0A0);
polyPaint.setStrokeWidth(0);
polyPaint.setStyle(SkPaint::kStroke_Style);
canvas->drawPoints(SkCanvas::kPolygon_PointMode, 3, controlPts, polyPaint);
SkPaint choppedPtPaint;
choppedPtPaint.setColor(~ctrlPtPaint.getColor() | 0xFF000000);
for (int c = 0; c < cnt; ++c) {
SkPoint* pts = dst[c].fPts;
for (int i = 0; i < 3; ++i) {
canvas->drawCircle(pts[i], 3.f, choppedPtPaint);
}
SkRect bounds;
//SkPoint bPts[] = {{0.f, 0.f}, {800.f, 800.f}};
//bounds.set(bPts, 2);
bounds.set(pts, 3);
SkPaint boundsPaint;
boundsPaint.setColor(0xff808080);
boundsPaint.setStrokeWidth(0);
boundsPaint.setStyle(SkPaint::kStroke_Style);
canvas->drawRect(bounds, boundsPaint);
GrPaint grPaint;
grPaint.setXPFactory(GrPorterDuffXPFactory::Get(SkBlendMode::kSrc));
std::unique_ptr<GrLegacyMeshDrawOp> op =
BezierCubicOrConicTestOp::Make(gp, bounds, color, klm, 1.f);
renderTargetContext->priv().testingOnly_addLegacyMeshDrawOp(
std::move(grPaint), GrAAType::kNone, std::move(op));
}
++col;
if (numCols == col) {
col = 0;
++row;
}
}
}
}
private:
// Uses the max curvature function for quads to estimate
// where to chop the conic. If the max curvature is not
// found along the curve segment it will return 1 and
// dst[0] is the original conic. If it returns 2 the dst[0]
// and dst[1] are the two new conics.
int split_conic(const SkPoint src[3], SkConic dst[2], const SkScalar weight) {
SkScalar t = SkFindQuadMaxCurvature(src);
if (t == 0) {
if (dst) {
dst[0].set(src, weight);
}
return 1;
} else {
if (dst) {
SkConic conic;
conic.set(src, weight);
if (!conic.chopAt(t, dst)) {
dst[0].set(src, weight);
return 1;
}
}
return 2;
}
}
// Calls split_conic on the entire conic and then once more on each subsection.
// Most cases will result in either 1 conic (chop point is not within t range)
// or 3 points (split once and then one subsection is split again).
int chop_conic(const SkPoint src[3], SkConic dst[4], const SkScalar weight) {
SkConic dstTemp[2];
int conicCnt = split_conic(src, dstTemp, weight);
if (2 == conicCnt) {
int conicCnt2 = split_conic(dstTemp[0].fPts, dst, dstTemp[0].fW);
conicCnt = conicCnt2 + split_conic(dstTemp[1].fPts, &dst[conicCnt2], dstTemp[1].fW);
} else {
dst[0] = dstTemp[0];
}
return conicCnt;
}
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
class BezierQuadTestOp : public GrTestMeshDrawOp {
public:
DEFINE_OP_CLASS_ID
const char* name() const override { return "BezierQuadTestOp"; }
static std::unique_ptr<GrLegacyMeshDrawOp> Make(sk_sp<GrGeometryProcessor> gp,
const SkRect& rect, GrColor color,
const GrPathUtils::QuadUVMatrix& devToUV) {
return std::unique_ptr<GrLegacyMeshDrawOp>(new BezierQuadTestOp(gp, rect, color, devToUV));
}
private:
BezierQuadTestOp(sk_sp<GrGeometryProcessor> gp, const SkRect& rect, GrColor color,
const GrPathUtils::QuadUVMatrix& devToUV)
: INHERITED(ClassID(), rect, color)
, fDevToUV(devToUV)
, fRect(rect)
, fGeometryProcessor(std::move(gp)) {}
struct Vertex {
SkPoint fPosition;
float fKLM[4]; // The last value is ignored. The effect expects a vec4f.
};
void onPrepareDraws(Target* target) const override {
QuadHelper helper;
size_t vertexStride = fGeometryProcessor->getVertexStride();
SkASSERT(vertexStride == sizeof(Vertex));
Vertex* verts = reinterpret_cast<Vertex*>(helper.init(target, vertexStride, 1));
if (!verts) {
return;
}
verts[0].fPosition.setRectFan(fRect.fLeft, fRect.fTop, fRect.fRight, fRect.fBottom,
sizeof(Vertex));
fDevToUV.apply<4, sizeof(Vertex), sizeof(SkPoint)>(verts);
helper.recordDraw(target, fGeometryProcessor.get(), this->pipeline());
}
GrPathUtils::QuadUVMatrix fDevToUV;
SkRect fRect;
sk_sp<GrGeometryProcessor> fGeometryProcessor;
static constexpr int kVertsPerCubic = 4;
static constexpr int kIndicesPerCubic = 6;
typedef GrTestMeshDrawOp INHERITED;
};
/**
* This GM directly exercises effects that draw Bezier quad curves in the GPU backend.
*/
class BezierQuadEffects : public GM {
public:
BezierQuadEffects() {
this->setBGColor(0xFFFFFFFF);
}
protected:
SkString onShortName() override {
return SkString("bezier_quad_effects");
}
SkISize onISize() override {
return SkISize::Make(800, 800);
}
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;
}
struct Vertex {
SkPoint fPosition;
float fUV[4]; // The last two values are ignored. The effect expects a vec4f.
};
constexpr int kNumQuads = 5;
SkRandom rand;
int numCols = SkScalarCeilToInt(SkScalarSqrt(SkIntToScalar(kNumQuads*3)));
int numRows = SkScalarCeilToInt(SkIntToScalar(kNumQuads*3) / numCols);
SkScalar w = SkIntToScalar(renderTargetContext->width()) / numCols;
SkScalar h = SkIntToScalar(renderTargetContext->height()) / numRows;
int row = 0;
int col = 0;
constexpr GrColor color = 0xff000000;
for (int i = 0; i < kNumQuads; ++i) {
SkPoint baseControlPts[] = {
{rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)},
{rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)},
{rand.nextRangeF(0.f, w), rand.nextRangeF(0.f, h)}
};
for(int edgeType = 0; edgeType < kGrProcessorEdgeTypeCnt; ++edgeType) {
sk_sp<GrGeometryProcessor> gp;
GrPrimitiveEdgeType et = (GrPrimitiveEdgeType)edgeType;
gp = GrQuadEffect::Make(color, SkMatrix::I(), et,
*context->caps(), SkMatrix::I(), false);
if (!gp) {
continue;
}
SkScalar x = col * w;
SkScalar y = row * h;
SkPoint controlPts[] = {
{x + baseControlPts[0].fX, y + baseControlPts[0].fY},
{x + baseControlPts[1].fX, y + baseControlPts[1].fY},
{x + baseControlPts[2].fX, y + baseControlPts[2].fY}
};
SkPoint chopped[5];
int cnt = SkChopQuadAtMaxCurvature(controlPts, chopped);
SkPaint ctrlPtPaint;
ctrlPtPaint.setColor(rand.nextU() | 0xFF000000);
for (int i = 0; i < 3; ++i) {
canvas->drawCircle(controlPts[i], 6.f, ctrlPtPaint);
}
SkPaint polyPaint;
polyPaint.setColor(0xffA0A0A0);
polyPaint.setStrokeWidth(0);
polyPaint.setStyle(SkPaint::kStroke_Style);
canvas->drawPoints(SkCanvas::kPolygon_PointMode, 3, controlPts, polyPaint);
SkPaint choppedPtPaint;
choppedPtPaint.setColor(~ctrlPtPaint.getColor() | 0xFF000000);
for (int c = 0; c < cnt; ++c) {
SkPoint* pts = chopped + 2 * c;
for (int i = 0; i < 3; ++i) {
canvas->drawCircle(pts[i], 3.f, choppedPtPaint);
}
SkRect bounds;
bounds.set(pts, 3);
SkPaint boundsPaint;
boundsPaint.setColor(0xff808080);
boundsPaint.setStrokeWidth(0);
boundsPaint.setStyle(SkPaint::kStroke_Style);
canvas->drawRect(bounds, boundsPaint);
GrPaint grPaint;
grPaint.setXPFactory(GrPorterDuffXPFactory::Get(SkBlendMode::kSrc));
GrPathUtils::QuadUVMatrix DevToUV(pts);
std::unique_ptr<GrLegacyMeshDrawOp> op =
BezierQuadTestOp::Make(gp, bounds, color, DevToUV);
renderTargetContext->priv().testingOnly_addLegacyMeshDrawOp(
std::move(grPaint), GrAAType::kNone, std::move(op));
}
++col;
if (numCols == col) {
col = 0;
++row;
}
}
}
}
private:
typedef GM INHERITED;
};
DEF_GM(return new BezierCubicEffects;)
DEF_GM(return new BezierConicEffects;)
DEF_GM(return new BezierQuadEffects;)
}
#endif
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