/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkGradientShader.h"
#include "SkLinearGradient.h"
namespace skiagm {
struct GradData {
int fCount;
const SkColor* fColors;
const SkScalar* fPos;
};
static const SkColor gColors[] = {
SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK
};
static const SkScalar gPos0[] = { 0, SK_Scalar1 };
static const SkScalar gPos1[] = { SK_Scalar1/4, SK_Scalar1*3/4 };
static const SkScalar gPos2[] = {
0, SK_Scalar1/8, SK_Scalar1/2, SK_Scalar1*7/8, SK_Scalar1
};
static const SkScalar gPosClamp[] = {0.0f, 0.0f, 1.0f, 1.0f};
static const SkColor gColorClamp[] = {
SK_ColorRED, SK_ColorGREEN, SK_ColorGREEN, SK_ColorBLUE
};
static const GradData gGradData[] = {
{ 2, gColors, nullptr },
{ 2, gColors, gPos0 },
{ 2, gColors, gPos1 },
{ 5, gColors, nullptr },
{ 5, gColors, gPos2 },
{ 4, gColorClamp, gPosClamp }
};
static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, const SkMatrix& localMatrix) {
return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos,
data.fCount, tm, 0, &localMatrix);
}
static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, const SkMatrix& localMatrix) {
SkPoint center;
center.set(SkScalarAve(pts[0].fX, pts[1].fX),
SkScalarAve(pts[0].fY, pts[1].fY));
return SkGradientShader::CreateRadial(center, center.fX, data.fColors,
data.fPos, data.fCount, tm, 0, &localMatrix);
}
static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data,
SkShader::TileMode, const SkMatrix& localMatrix) {
SkPoint center;
center.set(SkScalarAve(pts[0].fX, pts[1].fX),
SkScalarAve(pts[0].fY, pts[1].fY));
return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors,
data.fPos, data.fCount, 0, &localMatrix);
}
static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, const SkMatrix& localMatrix) {
SkPoint center0, center1;
center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
SkScalarAve(pts[0].fY, pts[1].fY));
center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5),
SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
return SkGradientShader::CreateTwoPointConical(
center1, (pts[1].fX - pts[0].fX) / 7,
center0, (pts[1].fX - pts[0].fX) / 2,
data.fColors, data.fPos, data.fCount, tm,
0, &localMatrix);
}
static SkShader* Make2Conical(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, const SkMatrix& localMatrix) {
SkPoint center0, center1;
SkScalar radius0 = (pts[1].fX - pts[0].fX) / 10;
SkScalar radius1 = (pts[1].fX - pts[0].fX) / 3;
center0.set(pts[0].fX + radius0, pts[0].fY + radius0);
center1.set(pts[1].fX - radius1, pts[1].fY - radius1);
return SkGradientShader::CreateTwoPointConical(center1, radius1,
center0, radius0,
data.fColors, data.fPos,
data.fCount, tm, 0, &localMatrix);
}
typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, const SkMatrix& localMatrix);
static const GradMaker gGradMakers[] = {
MakeLinear, MakeRadial, MakeSweep, Make2Radial, Make2Conical
};
///////////////////////////////////////////////////////////////////////////////
class GradientsGM : public GM {
public:
GradientsGM(bool dither) : fDither(dither) {
this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
}
protected:
SkString onShortName() {
return SkString(fDither ? "gradients" : "gradients_nodither");
}
virtual SkISize onISize() { return SkISize::Make(840, 815); }
virtual void onDraw(SkCanvas* canvas) {
SkPoint pts[2] = {
{ 0, 0 },
{ SkIntToScalar(100), SkIntToScalar(100) }
};
SkShader::TileMode tm = SkShader::kClamp_TileMode;
SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
SkPaint paint;
paint.setAntiAlias(true);
paint.setDither(fDither);
canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) {
canvas->save();
for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) {
SkMatrix scale = SkMatrix::I();
if (i == 5) { // if the clamp case
scale.setScale(0.5f, 0.5f);
scale.postTranslate(25.f, 25.f);
}
SkShader* shader = gGradMakers[j](pts, gGradData[i], tm, scale);
paint.setShader(shader);
canvas->drawRect(r, paint);
shader->unref();
canvas->translate(0, SkIntToScalar(120));
}
canvas->restore();
canvas->translate(SkIntToScalar(120), 0);
}
}
protected:
bool fDither;
private:
typedef GM INHERITED;
};
DEF_GM( return new GradientsGM(true); )
DEF_GM( return new GradientsGM(false); )
// Based on the original gradient slide, but with perspective applied to the
// gradient shaders' local matrices
class GradientsLocalPerspectiveGM : public GM {
public:
GradientsLocalPerspectiveGM(bool dither) : fDither(dither) {
this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
}
protected:
SkString onShortName() {
return SkString(fDither ? "gradients_local_perspective" :
"gradients_local_perspective_nodither");
}
virtual SkISize onISize() { return SkISize::Make(840, 815); }
virtual void onDraw(SkCanvas* canvas) {
SkPoint pts[2] = {
{ 0, 0 },
{ SkIntToScalar(100), SkIntToScalar(100) }
};
SkShader::TileMode tm = SkShader::kClamp_TileMode;
SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
SkPaint paint;
paint.setAntiAlias(true);
paint.setDither(fDither);
canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) {
canvas->save();
for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) {
// apply an increasing y perspective as we move to the right
SkMatrix perspective;
perspective.setIdentity();
perspective.setPerspY(SkIntToScalar(i+1) / 500);
perspective.setSkewX(SkIntToScalar(i+1) / 10);
SkShader* shader = gGradMakers[j](pts, gGradData[i], tm, perspective);
paint.setShader(shader);
canvas->drawRect(r, paint);
shader->unref();
canvas->translate(0, SkIntToScalar(120));
}
canvas->restore();
canvas->translate(SkIntToScalar(120), 0);
}
}
private:
bool fDither;
typedef GM INHERITED;
};
DEF_GM( return new GradientsLocalPerspectiveGM(true); )
DEF_GM( return new GradientsLocalPerspectiveGM(false); )
// Based on the original gradient slide, but with perspective applied to
// the view matrix
class GradientsViewPerspectiveGM : public GradientsGM {
public:
GradientsViewPerspectiveGM(bool dither) : INHERITED(dither) { }
protected:
SkString onShortName() {
return SkString(fDither ? "gradients_view_perspective" :
"gradients_view_perspective_nodither");
}
virtual SkISize onISize() { return SkISize::Make(840, 500); }
virtual void onDraw(SkCanvas* canvas) {
SkMatrix perspective;
perspective.setIdentity();
perspective.setPerspY(0.001f);
perspective.setSkewX(SkIntToScalar(8) / 25);
canvas->concat(perspective);
INHERITED::onDraw(canvas);
}
private:
typedef GradientsGM INHERITED;
};
DEF_GM( return new GradientsViewPerspectiveGM(true); )
DEF_GM( return new GradientsViewPerspectiveGM(false); )
/*
Inspired by this <canvas> javascript, where we need to detect that we are not
solving a quadratic equation, but must instead solve a linear (since our X^2
coefficient is 0)
ctx.fillStyle = '#f00';
ctx.fillRect(0, 0, 100, 50);
var g = ctx.createRadialGradient(-80, 25, 70, 0, 25, 150);
g.addColorStop(0, '#f00');
g.addColorStop(0.01, '#0f0');
g.addColorStop(0.99, '#0f0');
g.addColorStop(1, '#f00');
ctx.fillStyle = g;
ctx.fillRect(0, 0, 100, 50);
*/
class GradientsDegenrate2PointGM : public GM {
public:
GradientsDegenrate2PointGM(bool dither) : fDither(dither) {}
protected:
SkString onShortName() {
return SkString(fDither ? "gradients_degenerate_2pt" : "gradients_degenerate_2pt_nodither");
}
virtual SkISize onISize() { return SkISize::Make(320, 320); }
void drawBG(SkCanvas* canvas) {
canvas->drawColor(SK_ColorBLUE);
}
virtual void onDraw(SkCanvas* canvas) {
this->drawBG(canvas);
SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorGREEN, SK_ColorRED };
SkScalar pos[] = { 0, 0.01f, 0.99f, SK_Scalar1 };
SkPoint c0;
c0.iset(-80, 25);
SkScalar r0 = SkIntToScalar(70);
SkPoint c1;
c1.iset(0, 25);
SkScalar r1 = SkIntToScalar(150);
SkShader* s = SkGradientShader::CreateTwoPointConical(c0, r0, c1, r1, colors,
pos, SK_ARRAY_COUNT(pos),
SkShader::kClamp_TileMode);
SkPaint paint;
paint.setDither(fDither);
paint.setShader(s)->unref();
canvas->drawPaint(paint);
}
private:
bool fDither;
typedef GM INHERITED;
};
DEF_GM( return new GradientsDegenrate2PointGM(true); )
DEF_GM( return new GradientsDegenrate2PointGM(false); )
/// Tests correctness of *optimized* codepaths in gradients.
class ClampedGradientsGM : public GM {
public:
ClampedGradientsGM(bool dither) : fDither(dither) {}
protected:
SkString onShortName() {
return SkString(fDither ? "clamped_gradients" : "clamped_gradients_nodither");
}
virtual SkISize onISize() { return SkISize::Make(640, 510); }
void drawBG(SkCanvas* canvas) {
canvas->drawColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
}
virtual void onDraw(SkCanvas* canvas) {
this->drawBG(canvas);
SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(300) };
SkPaint paint;
paint.setDither(fDither);
paint.setAntiAlias(true);
SkPoint center;
center.iset(0, 300);
canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
SkShader* shader = SkGradientShader::CreateRadial(
SkPoint(center),
SkIntToScalar(200), gColors, nullptr, 5,
SkShader::kClamp_TileMode);
paint.setShader(shader);
canvas->drawRect(r, paint);
shader->unref();
}
private:
bool fDither;
typedef GM INHERITED;
};
DEF_GM( return new ClampedGradientsGM(true); )
DEF_GM( return new ClampedGradientsGM(false); )
/// Checks quality of large radial gradients, which may display
/// some banding.
class RadialGradientGM : public GM {
public:
RadialGradientGM() {}
protected:
SkString onShortName() override { return SkString("radial_gradient"); }
SkISize onISize() override { return SkISize::Make(1280, 1280); }
void drawBG(SkCanvas* canvas) {
canvas->drawColor(0xFF000000);
}
void onDraw(SkCanvas* canvas) override {
const SkISize dim = this->getISize();
this->drawBG(canvas);
SkPaint paint;
paint.setDither(true);
SkPoint center;
center.set(SkIntToScalar(dim.width())/2, SkIntToScalar(dim.height())/2);
SkScalar radius = SkIntToScalar(dim.width())/2;
const SkColor colors[] = { 0x7f7f7f7f, 0x7f7f7f7f, 0xb2000000 };
const SkScalar pos[] = { 0.0f,
0.35f,
1.0f };
SkShader* shader =
SkGradientShader::CreateRadial(center, radius, colors,
pos, SK_ARRAY_COUNT(pos),
SkShader::kClamp_TileMode);
paint.setShader(shader)->unref();
SkRect r = {
0, 0, SkIntToScalar(dim.width()), SkIntToScalar(dim.height())
};
canvas->drawRect(r, paint);
}
private:
typedef GM INHERITED;
};
DEF_GM( return new RadialGradientGM; )
class RadialGradient2GM : public GM {
public:
RadialGradient2GM(bool dither) : fDither(dither) {}
protected:
SkString onShortName() override {
return SkString(fDither ? "radial_gradient2" : "radial_gradient2_nodither");
}
SkISize onISize() override { return SkISize::Make(800, 400); }
void drawBG(SkCanvas* canvas) {
canvas->drawColor(0xFF000000);
}
// Reproduces the example given in bug 7671058.
void onDraw(SkCanvas* canvas) override {
SkPaint paint1, paint2, paint3;
paint1.setStyle(SkPaint::kFill_Style);
paint2.setStyle(SkPaint::kFill_Style);
paint3.setStyle(SkPaint::kFill_Style);
const SkColor sweep_colors[] =
{ 0xFFFF0000, 0xFFFFFF00, 0xFF00FF00, 0xFF00FFFF, 0xFF0000FF, 0xFFFF00FF, 0xFFFF0000 };
const SkColor colors1[] = { 0xFFFFFFFF, 0x00000000 };
const SkColor colors2[] = { 0xFF000000, 0x00000000 };
const SkScalar cx = 200, cy = 200, radius = 150;
SkPoint center;
center.set(cx, cy);
// We can either interpolate endpoints and premultiply each point (default, more precision),
// or premultiply the endpoints first, avoiding the need to premultiply each point (cheap).
const uint32_t flags[] = { 0, SkGradientShader::kInterpolateColorsInPremul_Flag };
for (size_t i = 0; i < SK_ARRAY_COUNT(flags); i++) {
SkAutoTUnref<SkShader> sweep(
SkGradientShader::CreateSweep(cx, cy, sweep_colors,
nullptr, SK_ARRAY_COUNT(sweep_colors),
flags[i], nullptr));
SkAutoTUnref<SkShader> radial1(
SkGradientShader::CreateRadial(center, radius, colors1,
nullptr, SK_ARRAY_COUNT(colors1),
SkShader::kClamp_TileMode,
flags[i], nullptr));
SkAutoTUnref<SkShader> radial2(
SkGradientShader::CreateRadial(center, radius, colors2,
nullptr, SK_ARRAY_COUNT(colors2),
SkShader::kClamp_TileMode,
flags[i], nullptr));
paint1.setShader(sweep);
paint1.setDither(fDither);
paint2.setShader(radial1);
paint2.setDither(fDither);
paint3.setShader(radial2);
paint3.setDither(fDither);
canvas->drawCircle(cx, cy, radius, paint1);
canvas->drawCircle(cx, cy, radius, paint3);
canvas->drawCircle(cx, cy, radius, paint2);
canvas->translate(400, 0);
}
}
private:
bool fDither;
typedef GM INHERITED;
};
DEF_GM( return new RadialGradient2GM(true); )
DEF_GM( return new RadialGradient2GM(false); )
// Shallow radial (shows banding on raster)
class RadialGradient3GM : public GM {
public:
RadialGradient3GM(bool dither) : fDither(dither) { }
protected:
SkString onShortName() override {
return SkString(fDither ? "radial_gradient3" : "radial_gradient3_nodither");
}
SkISize onISize() override { return SkISize::Make(500, 500); }
bool runAsBench() const override { return true; }
void onOnceBeforeDraw() override {
const SkPoint center = { 0, 0 };
const SkScalar kRadius = 3000;
const SkColor gColors[] = { 0xFFFFFFFF, 0xFF000000 };
fShader.reset(SkGradientShader::CreateRadial(center, kRadius, gColors, nullptr, 2,
SkShader::kClamp_TileMode));
}
void onDraw(SkCanvas* canvas) override {
SkPaint paint;
paint.setShader(fShader);
paint.setDither(fDither);
canvas->drawRect(SkRect::MakeWH(500, 500), paint);
}
private:
SkAutoTUnref<SkShader> fShader;
bool fDither;
typedef GM INHERITED;
};
DEF_GM( return new RadialGradient3GM(true); )
DEF_GM( return new RadialGradient3GM(false); )
class RadialGradient4GM : public GM {
public:
RadialGradient4GM(bool dither) : fDither(dither) { }
protected:
SkString onShortName() override {
return SkString(fDither ? "radial_gradient4" : "radial_gradient4_nodither");
}
SkISize onISize() override { return SkISize::Make(500, 500); }
void onOnceBeforeDraw() override {
const SkPoint center = { 250, 250 };
const SkScalar kRadius = 250;
const SkColor colors[] = { SK_ColorRED, SK_ColorRED, SK_ColorWHITE, SK_ColorWHITE,
SK_ColorRED };
const SkScalar pos[] = { 0, .4f, .4f, .8f, .8f, 1 };
fShader.reset(SkGradientShader::CreateRadial(center, kRadius, colors, pos,
SK_ARRAY_COUNT(gColors), SkShader::kClamp_TileMode));
}
void onDraw(SkCanvas* canvas) override {
SkPaint paint;
paint.setAntiAlias(true);
paint.setDither(fDither);
paint.setShader(fShader);
canvas->drawRect(SkRect::MakeWH(500, 500), paint);
}
private:
SkAutoTUnref<SkShader> fShader;
bool fDither;
typedef GM INHERITED;
};
DEF_GM( return new RadialGradient4GM(true); )
DEF_GM( return new RadialGradient4GM(false); )
class LinearGradientGM : public GM {
public:
LinearGradientGM(bool dither) : fDither(dither) { }
protected:
SkString onShortName() override {
return SkString(fDither ? "linear_gradient" : "linear_gradient_nodither");
}
const SkScalar kWidthBump = 30.f;
const SkScalar kHeight = 5.f;
const SkScalar kMinWidth = 540.f;
SkISize onISize() override { return SkISize::Make(500, 500); }
void onOnceBeforeDraw() override {
SkPoint pts[2] = { {0, 0}, {0, 0} };
const SkColor colors[] = { SK_ColorWHITE, SK_ColorWHITE, 0xFF008200, 0xFF008200,
SK_ColorWHITE, SK_ColorWHITE };
const SkScalar unitPos[] = { 0, 50, 70, 500, 540 };
SkScalar pos[6];
pos[5] = 1;
for (int index = 0; index < (int) SK_ARRAY_COUNT(fShader); ++index) {
pts[1].fX = 500.f + index * kWidthBump;
for (int inner = 0; inner < (int) SK_ARRAY_COUNT(unitPos); ++inner) {
pos[inner] = unitPos[inner] / (kMinWidth + index * kWidthBump);
}
fShader[index].reset(SkGradientShader::CreateLinear(pts, colors, pos,
SK_ARRAY_COUNT(gColors), SkShader::kClamp_TileMode));
}
}
void onDraw(SkCanvas* canvas) override {
SkPaint paint;
paint.setAntiAlias(true);
paint.setDither(fDither);
for (int index = 0; index < (int) SK_ARRAY_COUNT(fShader); ++index) {
paint.setShader(fShader[index]);
canvas->drawRect(SkRect::MakeLTRB(0, index * kHeight, kMinWidth + index * kWidthBump,
(index + 1) * kHeight), paint);
}
}
private:
SkAutoTUnref<SkShader> fShader[100];
bool fDither;
typedef GM INHERITED;
};
DEF_GM( return new LinearGradientGM(true); )
DEF_GM( return new LinearGradientGM(false); )
class LinearGradientTinyGM : public GM {
public:
LinearGradientTinyGM(uint32_t flags, const char* suffix = nullptr)
: fName("linear_gradient_tiny")
, fFlags(flags) {
fName.append(suffix);
}
protected:
SkString onShortName() override {
return fName;
}
SkISize onISize() override {
return SkISize::Make(600, 500);
}
void onDraw(SkCanvas* canvas) override {
const SkScalar kRectSize = 100;
const unsigned kStopCount = 3;
const SkColor colors[kStopCount] = { SK_ColorGREEN, SK_ColorRED, SK_ColorGREEN };
const struct {
SkPoint pts[2];
SkScalar pos[kStopCount];
} configs[] = {
{ { SkPoint::Make(0, 0), SkPoint::Make(10, 0) }, { 0, 0.999999f, 1 }},
{ { SkPoint::Make(0, 0), SkPoint::Make(10, 0) }, { 0, 0.000001f, 1 }},
{ { SkPoint::Make(0, 0), SkPoint::Make(10, 0) }, { 0, 0.999999999f, 1 }},
{ { SkPoint::Make(0, 0), SkPoint::Make(10, 0) }, { 0, 0.000000001f, 1 }},
{ { SkPoint::Make(0, 0), SkPoint::Make(0, 10) }, { 0, 0.999999f, 1 }},
{ { SkPoint::Make(0, 0), SkPoint::Make(0, 10) }, { 0, 0.000001f, 1 }},
{ { SkPoint::Make(0, 0), SkPoint::Make(0, 10) }, { 0, 0.999999999f, 1 }},
{ { SkPoint::Make(0, 0), SkPoint::Make(0, 10) }, { 0, 0.000000001f, 1 }},
{ { SkPoint::Make(0, 0), SkPoint::Make(0.00001f, 0) }, { 0, 0.5f, 1 }},
{ { SkPoint::Make(9.99999f, 0), SkPoint::Make(10, 0) }, { 0, 0.5f, 1 }},
{ { SkPoint::Make(0, 0), SkPoint::Make(0, 0.00001f) }, { 0, 0.5f, 1 }},
{ { SkPoint::Make(0, 9.99999f), SkPoint::Make(0, 10) }, { 0, 0.5f, 1 }},
};
SkPaint paint;
for (unsigned i = 0; i < SK_ARRAY_COUNT(configs); ++i) {
SkAutoCanvasRestore acr(canvas, true);
SkAutoTUnref<SkShader> gradient(
SkGradientShader::CreateLinear(configs[i].pts, colors, configs[i].pos, kStopCount,
SkShader::kClamp_TileMode, fFlags, nullptr));
canvas->translate(kRectSize * ((i % 4) * 1.5f + 0.25f),
kRectSize * ((i / 4) * 1.5f + 0.25f));
paint.setShader(gradient);
canvas->drawRect(SkRect::MakeWH(kRectSize, kRectSize), paint);
}
}
private:
typedef GM INHERITED;
SkString fName;
uint32_t fFlags;
};
DEF_GM( return new LinearGradientTinyGM(0); )
DEF_GM( return new LinearGradientTinyGM(SkLinearGradient::kForce4fContext_PrivateFlag, "_4f"); )
}
///////////////////////////////////////////////////////////////////////////////////////////////////
struct GradRun {
SkColor fColors[4];
SkScalar fPos[4];
int fCount;
};
#define SIZE 121
static SkShader* make_linear(const GradRun& run, SkShader::TileMode mode) {
const SkPoint pts[] { { 30, 30 }, { SIZE - 30, SIZE - 30 } };
return SkGradientShader::CreateLinear(pts, run.fColors, run.fPos, run.fCount, mode);
}
static SkShader* make_radial(const GradRun& run, SkShader::TileMode mode) {
const SkScalar half = SIZE * 0.5f;
return SkGradientShader::CreateRadial({half,half}, half - 10,
run.fColors, run.fPos, run.fCount, mode);
}
static SkShader* make_conical(const GradRun& run, SkShader::TileMode mode) {
const SkScalar half = SIZE * 0.5f;
const SkPoint center { half, half };
return SkGradientShader::CreateTwoPointConical(center, 20, center, half - 10,
run.fColors, run.fPos, run.fCount, mode);
}
static SkShader* make_sweep(const GradRun& run, SkShader::TileMode) {
const SkScalar half = SIZE * 0.5f;
return SkGradientShader::CreateSweep(half, half, run.fColors, run.fPos, run.fCount);
}
/*
* Exercise duplicate color-stops, at the ends, and in the middle
*
* At the time of this writing, only Linear correctly deals with duplicates at the ends,
* and then only correctly on CPU backend.
*/
DEF_SIMPLE_GM(gradients_dup_color_stops, canvas, 704, 564) {
const SkColor preColor = 0xFFFF0000; // clamp color before start
const SkColor postColor = 0xFF0000FF; // clamp color after end
const SkColor color0 = 0xFF000000;
const SkColor color1 = 0xFF00FF00;
const SkColor badColor = 0xFF3388BB; // should never be seen, fills out fixed-size array
const GradRun runs[] = {
{ { color0, color1, badColor, badColor },
{ 0, 1, -1, -1 },
2,
},
{ { preColor, color0, color1, badColor },
{ 0, 0, 1, -1 },
3,
},
{ { color0, color1, postColor, badColor },
{ 0, 1, 1, -1 },
3,
},
{ { preColor, color0, color1, postColor },
{ 0, 0, 1, 1 },
4,
},
{ { color0, color0, color1, color1 },
{ 0, 0.5f, 0.5f, 1 },
4,
},
};
SkShader* (*factories[])(const GradRun&, SkShader::TileMode) {
make_linear, make_radial, make_conical, make_sweep
};
const SkRect rect = SkRect::MakeWH(SIZE, SIZE);
const SkScalar dx = SIZE + 20;
const SkScalar dy = SIZE + 20;
const SkShader::TileMode mode = SkShader::kClamp_TileMode;
SkPaint paint;
canvas->translate(10, 10 - dy);
for (auto factory : factories) {
canvas->translate(0, dy);
SkAutoCanvasRestore acr(canvas, true);
for (const auto& run : runs) {
paint.setShader(factory(run, mode))->unref();
canvas->drawRect(rect, paint);
canvas->translate(dx, 0);
}
}
}
static void draw_many_stops(SkCanvas* canvas, uint32_t flags) {
const unsigned kStopCount = 200;
const SkPoint pts[] = { {50, 50}, {450, 465}};
SkColor colors[kStopCount];
for (unsigned i = 0; i < kStopCount; i++) {
switch (i % 5) {
case 0: colors[i] = SK_ColorRED; break;
case 1: colors[i] = SK_ColorGREEN; break;
case 2: colors[i] = SK_ColorGREEN; break;
case 3: colors[i] = SK_ColorBLUE; break;
case 4: colors[i] = SK_ColorRED; break;
}
}
SkAutoTUnref<SkShader> shader(SkGradientShader::CreateLinear(
pts, colors, nullptr, SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode, flags, nullptr));
SkPaint p;
p.setShader(shader);
canvas->drawRect(SkRect::MakeXYWH(0, 0, 500, 500), p);
}
DEF_SIMPLE_GM(gradient_many_stops, canvas, 500, 500) {
draw_many_stops(canvas, 0);
}
DEF_SIMPLE_GM(gradient_many_stops_4f, canvas, 500, 500) {
draw_many_stops(canvas, SkLinearGradient::kForce4fContext_PrivateFlag);
}