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skia2/gm/gradients.cpp
brianosman e25d71ccbc Gradients are serialized (and can be constructed) as SkColor4f + SkColorSpace 
Added gradient shader factories that take SkColor4f + SkColorSpace.
Modified Descriptor to only store SkColor4f + SkColorSpace.
Existing factories make use of helper code to convert SkColor and
forward to the new factories.

Bumped SKP version to handle new gradient serialization format.
I was toying with using half-float when serializing SkColor4f,
despite my aggressive packing of flags, this format is significantly
bigger.

Also added GM to use 4f factories. This GM should (and does)
look identical to the existing gradients GM.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2370063002

Review-Url: https://codereview.chromium.org/2370063002
2016-09-28 11:27:28 -07:00

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/*
* 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 SkColor4f* fColors4f;
const SkScalar* fPos;
};
constexpr SkColor gColors[] = {
SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK
};
constexpr SkColor4f gColors4f[] ={
{ 1.0f, 0.0f, 0.0f, 1.0f }, // Red
{ 0.0f, 1.0f, 0.0f, 1.0f }, // Green
{ 0.0f, 0.0f, 1.0f, 1.0f }, // Blue
{ 1.0f, 1.0f, 1.0f, 1.0f }, // White
{ 0.0f, 0.0f, 0.0f, 1.0f } // Black
};
constexpr SkScalar gPos0[] = { 0, SK_Scalar1 };
constexpr SkScalar gPos1[] = { SK_Scalar1/4, SK_Scalar1*3/4 };
constexpr SkScalar gPos2[] = {
0, SK_Scalar1/8, SK_Scalar1/2, SK_Scalar1*7/8, SK_Scalar1
};
constexpr SkScalar gPosClamp[] = {0.0f, 0.0f, 1.0f, 1.0f};
constexpr SkColor gColorClamp[] = {
SK_ColorRED, SK_ColorGREEN, SK_ColorGREEN, SK_ColorBLUE
};
constexpr SkColor4f gColor4fClamp[] ={
{ 1.0f, 0.0f, 0.0f, 1.0f }, // Red
{ 0.0f, 1.0f, 0.0f, 1.0f }, // Green
{ 0.0f, 1.0f, 0.0f, 1.0f }, // Green
{ 0.0f, 0.0f, 1.0f, 1.0f } // Blue
};
constexpr GradData gGradData[] = {
{ 2, gColors, gColors4f, nullptr },
{ 2, gColors, gColors4f, gPos0 },
{ 2, gColors, gColors4f, gPos1 },
{ 5, gColors, gColors4f, nullptr },
{ 5, gColors, gColors4f, gPos2 },
{ 4, gColorClamp, gColor4fClamp, gPosClamp }
};
static sk_sp<SkShader> MakeLinear(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, const SkMatrix& localMatrix) {
return SkGradientShader::MakeLinear(pts, data.fColors, data.fPos, data.fCount, tm, 0,
&localMatrix);
}
static sk_sp<SkShader> MakeLinear4f(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, const SkMatrix& localMatrix) {
auto srgb = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named)->makeLinearGamma();
return SkGradientShader::MakeLinear(pts, data.fColors4f, srgb, data.fPos, data.fCount, tm, 0,
&localMatrix);
}
static sk_sp<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::MakeRadial(center, center.fX, data.fColors, data.fPos, data.fCount,
tm, 0, &localMatrix);
}
static sk_sp<SkShader> MakeRadial4f(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));
auto srgb = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named)->makeLinearGamma();
return SkGradientShader::MakeRadial(center, center.fX, data.fColors4f, srgb, data.fPos,
data.fCount, tm, 0, &localMatrix);
}
static sk_sp<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::MakeSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount,
0, &localMatrix);
}
static sk_sp<SkShader> MakeSweep4f(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));
auto srgb = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named)->makeLinearGamma();
return SkGradientShader::MakeSweep(center.fX, center.fY, data.fColors4f, srgb, data.fPos,
data.fCount, 0, &localMatrix);
}
static sk_sp<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::MakeTwoPointConical(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 sk_sp<SkShader> Make2Radial4f(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));
auto srgb = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named)->makeLinearGamma();
return SkGradientShader::MakeTwoPointConical(center1, (pts[1].fX - pts[0].fX) / 7,
center0, (pts[1].fX - pts[0].fX) / 2,
data.fColors4f, srgb, data.fPos, data.fCount, tm,
0, &localMatrix);
}
static sk_sp<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::MakeTwoPointConical(center1, radius1, center0, radius0,
data.fColors, data.fPos,
data.fCount, tm, 0, &localMatrix);
}
static sk_sp<SkShader> Make2Conical4f(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);
auto srgb = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named)->makeLinearGamma();
return SkGradientShader::MakeTwoPointConical(center1, radius1, center0, radius0,
data.fColors4f, srgb, data.fPos,
data.fCount, tm, 0, &localMatrix);
}
typedef sk_sp<SkShader> (*GradMaker)(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, const SkMatrix& localMatrix);
constexpr GradMaker gGradMakers[] = {
MakeLinear, MakeRadial, MakeSweep, Make2Radial, Make2Conical
};
constexpr GradMaker gGradMakers4f[] ={
MakeLinear4f, MakeRadial4f, MakeSweep4f, Make2Radial4f, Make2Conical4f
};
///////////////////////////////////////////////////////////////////////////////
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);
}
paint.setShader(gGradMakers[j](pts, gGradData[i], tm, scale));
canvas->drawRect(r, paint);
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); )
// Like the original gradients GM, but using the SkColor4f shader factories. Should be identical.
class Gradients4fGM : public GM {
public:
Gradients4fGM(bool dither) : fDither(dither) {
this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
}
protected:
SkString onShortName() {
return SkString(fDither ? "gradients4f" : "gradients4f_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(gGradMakers4f); j++) {
SkMatrix scale = SkMatrix::I();
if (i == 5) { // if the clamp case
scale.setScale(0.5f, 0.5f);
scale.postTranslate(25.f, 25.f);
}
paint.setShader(gGradMakers4f[j](pts, gGradData[i], tm, scale));
canvas->drawRect(r, paint);
canvas->translate(0, SkIntToScalar(120));
}
canvas->restore();
canvas->translate(SkIntToScalar(120), 0);
}
}
protected:
bool fDither;
private:
typedef GM INHERITED;
};
DEF_GM(return new Gradients4fGM(true); )
DEF_GM(return new Gradients4fGM(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);
paint.setShader(gGradMakers[j](pts, gGradData[i], tm, perspective));
canvas->drawRect(r, paint);
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);
SkPaint paint;
paint.setShader(SkGradientShader::MakeTwoPointConical(c0, r0, c1, r1, colors,
pos, SK_ARRAY_COUNT(pos),
SkShader::kClamp_TileMode));
paint.setDither(fDither);
canvas->drawPaint(paint);
}
private:
bool fDither;
typedef GM INHERITED;
};
DEF_GM( return new GradientsDegenrate2PointGM(true); )
DEF_GM( return new GradientsDegenrate2PointGM(false); )
/* bug.skia.org/517
<canvas id="canvas"></canvas>
<script>
var c = document.getElementById("canvas");
var ctx = c.getContext("2d");
ctx.fillStyle = '#ff0';
ctx.fillRect(0, 0, 100, 50);
var g = ctx.createRadialGradient(200, 25, 20, 200, 25, 10);
g.addColorStop(0, '#0f0');
g.addColorStop(0.003, '#f00'); // 0.004 makes this work
g.addColorStop(1, '#ff0');
ctx.fillStyle = g;
ctx.fillRect(0, 0, 100, 50);
</script>
*/
// should draw only green
DEF_SIMPLE_GM(small_color_stop, canvas, 100, 150) {
SkColor colors[] = { SK_ColorGREEN, SK_ColorRED, SK_ColorYELLOW };
SkScalar pos[] = { 0, 0.003f, SK_Scalar1 }; // 0.004f makes this work
SkPoint c0 = { 200, 25 };
SkScalar r0 = 20;
SkPoint c1 = { 200, 25 };
SkScalar r1 = 10;
SkPaint paint;
paint.setColor(SK_ColorYELLOW);
canvas->drawRect(SkRect::MakeWH(100, 150), paint);
paint.setShader(SkGradientShader::MakeTwoPointConical(c0, r0, c1, r1, colors, pos,
SK_ARRAY_COUNT(pos),
SkShader::kClamp_TileMode));
canvas->drawRect(SkRect::MakeWH(100, 150), paint);
}
/// 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));
paint.setShader(SkGradientShader::MakeRadial(
SkPoint(center),
SkIntToScalar(200), gColors, nullptr, 5,
SkShader::kClamp_TileMode));
canvas->drawRect(r, paint);
}
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 };
paint.setShader(SkGradientShader::MakeRadial(center, radius, colors, pos,
SK_ARRAY_COUNT(pos),
SkShader::kClamp_TileMode));
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++) {
paint1.setShader(SkGradientShader::MakeSweep(cx, cy, sweep_colors,
nullptr, SK_ARRAY_COUNT(sweep_colors),
flags[i], nullptr));
paint2.setShader(SkGradientShader::MakeRadial(center, radius, colors1,
nullptr, SK_ARRAY_COUNT(colors1),
SkShader::kClamp_TileMode,
flags[i], nullptr));
paint3.setShader(SkGradientShader::MakeRadial(center, radius, colors2,
nullptr, SK_ARRAY_COUNT(colors2),
SkShader::kClamp_TileMode,
flags[i], nullptr));
paint1.setDither(fDither);
paint2.setDither(fDither);
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 = SkGradientShader::MakeRadial(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:
sk_sp<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 = SkGradientShader::MakeRadial(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:
sk_sp<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] = SkGradientShader::MakeLinear(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:
sk_sp<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);
paint.setShader(SkGradientShader::MakeLinear(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));
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 sk_sp<SkShader> make_linear(const GradRun& run, SkShader::TileMode mode) {
const SkPoint pts[] { { 30, 30 }, { SIZE - 30, SIZE - 30 } };
return SkGradientShader::MakeLinear(pts, run.fColors, run.fPos, run.fCount, mode);
}
static sk_sp<SkShader> make_radial(const GradRun& run, SkShader::TileMode mode) {
const SkScalar half = SIZE * 0.5f;
return SkGradientShader::MakeRadial({half,half}, half - 10, run.fColors, run.fPos,
run.fCount, mode);
}
static sk_sp<SkShader> make_conical(const GradRun& run, SkShader::TileMode mode) {
const SkScalar half = SIZE * 0.5f;
const SkPoint center { half, half };
return SkGradientShader::MakeTwoPointConical(center, 20, center, half - 10,
run.fColors, run.fPos, run.fCount, mode);
}
static sk_sp<SkShader> make_sweep(const GradRun& run, SkShader::TileMode) {
const SkScalar half = SIZE * 0.5f;
return SkGradientShader::MakeSweep(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,
},
};
sk_sp<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));
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;
}
}
SkPaint p;
p.setShader(SkGradientShader::MakeLinear(
pts, colors, nullptr, SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode, flags, nullptr));
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);
}
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