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skia2/gm/beziereffects.cpp
Chris Dalton febbffad1c Improve cubic KLM accuracy 
Moves cubic root finding logic out of GrPathUtils and
PathOpsCubicIntersectionTest, and unifies it in SkGeometry.

"Normalizes" the homogeneous parameter values of the roots, rather
than the cubic inflection function. Does this normalization by
twiddling the exponents instead of division (which causes a loss of
precision).

Abandons the built-in derivatives in GrCubicEffect. These don't have
high enough precision on many mobile gpus. Instead we pass the KLM
matrix to the vertex shader via uniform, where we can use it to set up
new linear functionals from which the fragment shader can calculate
the gradient of the implicit function.

Bug: skia:4410
Change-Id: Ibd64e999520adc8cdef7803a492d3699995aef5a
Reviewed-on: https://skia-review.googlesource.com/19017
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
2017-06-09 17:13:54 +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 BezierCubicTestOp : public GrTestMeshDrawOp {
public:
DEFINE_OP_CLASS_ID
const char* name() const override { return "BezierCubicTestOp"; }
static std::unique_ptr<GrLegacyMeshDrawOp> Make(sk_sp<GrGeometryProcessor> gp,
const SkRect& rect, GrColor color) {
return std::unique_ptr<GrLegacyMeshDrawOp>(new BezierCubicTestOp(gp, rect, color));
}
private:
BezierCubicTestOp(sk_sp<GrGeometryProcessor> gp, const SkRect& rect, GrColor color)
: INHERITED(ClassID(), rect, color)
, fRect(rect)
, fGeometryProcessor(std::move(gp)) {
}
void onPrepareDraws(Target* target) const override {
QuadHelper helper;
size_t vertexStride = fGeometryProcessor->getVertexStride();
SkASSERT(vertexStride == sizeof(SkPoint));
SkPoint* pts = reinterpret_cast<SkPoint*>(helper.init(target, vertexStride, 1));
if (!pts) {
return;
}
pts[0].setRectFan(fRect.fLeft, fRect.fTop, fRect.fRight, fRect.fBottom, vertexStride);
helper.recordDraw(target, fGeometryProcessor.get(), this->pipeline());
}
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(GrPrimitiveEdgeType edgeType : {kFillBW_GrProcessorEdgeType,
kFillAA_GrProcessorEdgeType,
kHairlineAA_GrProcessorEdgeType}) {
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));
bool flipKL = (c == loopIndex && cnt != 3);
sk_sp<GrGeometryProcessor> gp = GrCubicEffect::Make(color, SkMatrix::I(), klm,
flipKL, edgeType,
*context->caps());
if (!gp) {
break;
}
std::unique_ptr<GrLegacyMeshDrawOp> op =
BezierCubicTestOp::Make(std::move(gp), bounds, color);
renderTargetContext->priv().testingOnly_addLegacyMeshDrawOp(
std::move(grPaint), GrAAType::kNone, std::move(op));
}
++col;
if (numCols == col) {
col = 0;
++row;
}
}
}
}
private:
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
class BezierConicTestOp : public GrTestMeshDrawOp {
public:
DEFINE_OP_CLASS_ID
const char* name() const override { return "BezierConicTestOp"; }
static std::unique_ptr<GrLegacyMeshDrawOp> Make(sk_sp<GrGeometryProcessor> gp,
const SkRect& rect, GrColor color,
const SkMatrix& klm) {
return std::unique_ptr<GrLegacyMeshDrawOp>(new BezierConicTestOp(gp, rect, color, klm));
}
private:
BezierConicTestOp(sk_sp<GrGeometryProcessor> gp, const SkRect& rect, GrColor color,
const SkMatrix& klm)
: INHERITED(ClassID(), rect, color)
, fKLM(klm)
, 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));
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 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 =
BezierConicTestOp::Make(gp, bounds, color, klm);
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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