gm/gradients_no_texture.cpp - platform/external/skia - Gitiles

 /*
  * Copyright 2013 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"

 using namespace skiagm;

 struct GradData {
     int             fCount;
     const SkColor*  fColors;
     const SkScalar* fPos;
 };

 static const SkColor gColors[] = {
     SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE,
 };

 static const GradData gGradData[] = {
     { 1, gColors, nullptr },
     { 2, gColors, nullptr },
     { 3, gColors, nullptr },
     { 4, gColors, nullptr },
 };

 static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
     return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos, data.fCount, tm);
 }

 static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
     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);
 }

 static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data, SkShader::TileMode) {
     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);
 }

 static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
     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);
 }

 static SkShader* Make2Conical(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
     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);
 }


 typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm);

 static const GradMaker gGradMakers[] = {
     MakeLinear, MakeRadial, MakeSweep, Make2Radial, Make2Conical,
 };

 ///////////////////////////////////////////////////////////////////////////////

 class GradientsNoTextureGM : public GM {
 public:
     GradientsNoTextureGM(bool dither) : fDither(dither) {
         this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
     }

 protected:

     SkString onShortName() override {
         return SkString(fDither ? "gradients_no_texture" : "gradients_no_texture_nodither");
     }

     SkISize onISize() override { return SkISize::Make(640, 615); }

     void onDraw(SkCanvas* canvas) override {
         static const SkPoint kPts[2] = { { 0, 0 },
                                          { SkIntToScalar(50), SkIntToScalar(50) } };
         static const SkShader::TileMode kTM = SkShader::kClamp_TileMode;
         SkRect kRect = { 0, 0, SkIntToScalar(50), SkIntToScalar(50) };
         SkPaint paint;
         paint.setAntiAlias(true);
         paint.setDither(fDither);

         canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
         static const uint8_t kAlphas[] = { 0xff, 0x40 };
         for (size_t a = 0; a < SK_ARRAY_COUNT(kAlphas); ++a) {
             for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); ++i) {
                 canvas->save();
                 for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); ++j) {
                     SkShader* shader = gGradMakers[j](kPts, gGradData[i], kTM);
                     paint.setShader(shader)->unref();
                     paint.setAlpha(kAlphas[a]);
                     canvas->drawRect(kRect, paint);
                     canvas->translate(0, SkIntToScalar(kRect.height() + 20));
                 }
                 canvas->restore();
                 canvas->translate(SkIntToScalar(kRect.width() + 20), 0);
             }
         }
     }

 private:
     bool fDither;

     typedef GM INHERITED;
 };

 ///////////////////////////////////////////////////////////////////////////////

 struct ColorPos {
     SkColor*    fColors;
     SkScalar*   fPos;
     int         fCount;

     ColorPos() : fColors(nullptr), fPos(nullptr), fCount(0) {}
     ~ColorPos() {
         delete[] fColors;
         delete[] fPos;
     }

     void construct(const SkColor colors[], const SkScalar pos[], int count) {
         fColors = new SkColor[count];
         memcpy(fColors, colors, count * sizeof(SkColor));
         if (pos) {
             fPos = new SkScalar[count];
             memcpy(fPos, pos, count * sizeof(SkScalar));
             fPos[0] = 0;
             fPos[count - 1] = 1;
         }
         fCount = count;
     }
 };

 static void make0(ColorPos* rec) {
 #if 0
     From http://jsfiddle.net/3fe2a/

 background-image: -webkit-linear-gradient(left, #22d1cd 1%, #22d1cd 0.9510157507590116%, #df4b37 2.9510157507590113%, #df4b37 23.695886056604927%, #22d1cd 25.695886056604927%, #22d1cd 25.39321881940624%, #e6de36 27.39321881940624%, #e6de36 31.849399922570655%, #3267ff 33.849399922570655%, #3267ff 44.57735802921938%, #9d47d1 46.57735802921938%, #9d47d1 53.27185850805876%, #3267ff 55.27185850805876%, #3267ff 61.95718972227316%, #5cdd9d 63.95718972227316%, #5cdd9d 69.89166004442%, #3267ff 71.89166004442%, #3267ff 74.45795382765857%, #9d47d1 76.45795382765857%, #9d47d1 82.78364610713776%, #3267ff 84.78364610713776%, #3267ff 94.52743647737229%, #e3d082 96.52743647737229%, #e3d082 96.03934633331295%);
 height: 30px;
 #endif

     const SkColor colors[] = {
         0xFF22d1cd, 0xFF22d1cd, 0xFFdf4b37, 0xFFdf4b37, 0xFF22d1cd, 0xFF22d1cd, 0xFFe6de36, 0xFFe6de36,
         0xFF3267ff, 0xFF3267ff, 0xFF9d47d1, 0xFF9d47d1, 0xFF3267ff, 0xFF3267ff, 0xFF5cdd9d, 0xFF5cdd9d,
         0xFF3267ff, 0xFF3267ff, 0xFF9d47d1, 0xFF9d47d1, 0xFF3267ff, 0xFF3267ff, 0xFFe3d082, 0xFFe3d082
     };
     const double percent[] = {
         1, 0.9510157507590116, 2.9510157507590113, 23.695886056604927,
         25.695886056604927, 25.39321881940624, 27.39321881940624, 31.849399922570655,
         33.849399922570655, 44.57735802921938, 46.57735802921938, 53.27185850805876,
         55.27185850805876, 61.95718972227316, 63.95718972227316, 69.89166004442,
         71.89166004442, 74.45795382765857, 76.45795382765857, 82.78364610713776,
         84.78364610713776, 94.52743647737229, 96.52743647737229, 96.03934633331295,
     };
     const int N = SK_ARRAY_COUNT(percent);
     SkScalar pos[N];
     for (int i = 0; i < N; ++i) {
         pos[i] = SkDoubleToScalar(percent[i] / 100);
     }
     rec->construct(colors, pos, N);
 }

 static void make1(ColorPos* rec) {
     const SkColor colors[] = {
         SK_ColorBLACK, SK_ColorWHITE, SK_ColorBLACK, SK_ColorWHITE,
         SK_ColorBLACK, SK_ColorWHITE, SK_ColorBLACK, SK_ColorWHITE,
         SK_ColorBLACK,
     };
     rec->construct(colors, nullptr, SK_ARRAY_COUNT(colors));
 }

 static void make2(ColorPos* rec) {
     const SkColor colors[] = {
         SK_ColorBLACK, SK_ColorWHITE, SK_ColorBLACK, SK_ColorWHITE,
         SK_ColorBLACK, SK_ColorWHITE, SK_ColorBLACK, SK_ColorWHITE,
         SK_ColorBLACK,
     };
     const int N = SK_ARRAY_COUNT(colors);
     SkScalar pos[N];
     for (int i = 0; i < N; ++i) {
         pos[i] = SK_Scalar1 * i / (N - 1);
     }
     rec->construct(colors, pos, N);
 }

 static void make3(ColorPos* rec) {
     const SkColor colors[] = {
         SK_ColorRED, SK_ColorBLUE, SK_ColorBLUE, SK_ColorGREEN, SK_ColorGREEN, SK_ColorBLACK,
     };
     const SkScalar pos[] = {
         0, 0, 0.5f, 0.5, 1, 1,
     };
     rec->construct(colors, pos, SK_ARRAY_COUNT(colors));
 }

 class GradientsManyColorsGM : public GM {
     enum {
         W = 800,
     };
     SkAutoTUnref<SkShader> fShader;

     typedef void (*Proc)(ColorPos*);
 public:
     GradientsManyColorsGM(bool dither) : fDither(dither) {}

 protected:

     SkString onShortName() override {
         return SkString(fDither ? "gradients_many" : "gradients_many_nodither");
     }

     SkISize onISize() override { return SkISize::Make(880, 400); }

     void onDraw(SkCanvas* canvas) override {
         const Proc procs[] = {
             make0, make1, make2, make3,
         };
         const SkPoint pts[] = {
             { 0, 0 },
             { SkIntToScalar(W), 0 },
         };
         const SkRect r = SkRect::MakeWH(SkIntToScalar(W), 30);

         SkPaint paint;
         paint.setDither(fDither);

         canvas->translate(40, 20);

         for (int i = 0; i <= 8; ++i) {
             SkScalar x = r.width() * i / 8;
             canvas->drawLine(x, 0, x, 10000, paint);
         }

         // expand the drawing rect so we exercise clampping in the gradients
         const SkRect drawR = r.makeOutset(20, 0);
         for (size_t i = 0; i < SK_ARRAY_COUNT(procs); ++i) {
             ColorPos rec;
             procs[i](&rec);
             SkShader* s = SkGradientShader::CreateLinear(pts, rec.fColors, rec.fPos, rec.fCount,
                                                          SkShader::kClamp_TileMode);
             paint.setShader(s)->unref();
             canvas->drawRect(drawR, paint);

             canvas->save();
             canvas->translate(r.centerX(), r.height() + 4);
             canvas->scale(-1, 1);
             canvas->translate(-r.centerX(), 0);
             canvas->drawRect(drawR, paint);
             canvas->restore();

             canvas->translate(0, r.height() + 2*r.height() + 8);
         }
     }

 private:
     bool fDither;

     typedef GM INHERITED;
 };

 ///////////////////////////////////////////////////////////////////////////////

 DEF_GM(return new GradientsNoTextureGM(true);)
 DEF_GM(return new GradientsNoTextureGM(false);)
 DEF_GM(return new GradientsManyColorsGM(true);)
 DEF_GM(return new GradientsManyColorsGM(false);)
	/*
	* Copyright 2013 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"

	using namespace skiagm;

	struct GradData {
	int fCount;
	const SkColor* fColors;
	const SkScalar* fPos;
	};

	static const SkColor gColors[] = {
	SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE,
	};

	static const GradData gGradData[] = {
	{ 1, gColors, nullptr },
	{ 2, gColors, nullptr },
	{ 3, gColors, nullptr },
	{ 4, gColors, nullptr },
	};

	static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
	return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos, data.fCount, tm);
	}

	static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
	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);
	}

	static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data, SkShader::TileMode) {
	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);
	}

	static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
	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);
	}

	static SkShader* Make2Conical(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
	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);
	}


	typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm);

	static const GradMaker gGradMakers[] = {
	MakeLinear, MakeRadial, MakeSweep, Make2Radial, Make2Conical,
	};

	///////////////////////////////////////////////////////////////////////////////

	class GradientsNoTextureGM : public GM {
	public:
	GradientsNoTextureGM(bool dither) : fDither(dither) {
	this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
	}

	protected:

	SkString onShortName() override {
	return SkString(fDither ? "gradients_no_texture" : "gradients_no_texture_nodither");
	}

	SkISize onISize() override { return SkISize::Make(640, 615); }

	void onDraw(SkCanvas* canvas) override {
	static const SkPoint kPts[2] = { { 0, 0 },
	{ SkIntToScalar(50), SkIntToScalar(50) } };
	static const SkShader::TileMode kTM = SkShader::kClamp_TileMode;
	SkRect kRect = { 0, 0, SkIntToScalar(50), SkIntToScalar(50) };
	SkPaint paint;
	paint.setAntiAlias(true);
	paint.setDither(fDither);

	canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
	static const uint8_t kAlphas[] = { 0xff, 0x40 };
	for (size_t a = 0; a < SK_ARRAY_COUNT(kAlphas); ++a) {
	for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); ++i) {
	canvas->save();
	for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); ++j) {
	SkShader* shader = gGradMakers[j](kPts, gGradData[i], kTM);
	paint.setShader(shader)->unref();
	paint.setAlpha(kAlphas[a]);
	canvas->drawRect(kRect, paint);
	canvas->translate(0, SkIntToScalar(kRect.height() + 20));
	}
	canvas->restore();
	canvas->translate(SkIntToScalar(kRect.width() + 20), 0);
	}
	}
	}

	private:
	bool fDither;

	typedef GM INHERITED;
	};

	///////////////////////////////////////////////////////////////////////////////

	struct ColorPos {
	SkColor* fColors;
	SkScalar* fPos;
	int fCount;

	ColorPos() : fColors(nullptr), fPos(nullptr), fCount(0) {}
	~ColorPos() {
	delete[] fColors;
	delete[] fPos;
	}

	void construct(const SkColor colors[], const SkScalar pos[], int count) {
	fColors = new SkColor[count];
	memcpy(fColors, colors, count * sizeof(SkColor));
	if (pos) {
	fPos = new SkScalar[count];
	memcpy(fPos, pos, count * sizeof(SkScalar));
	fPos[0] = 0;
	fPos[count - 1] = 1;
	}
	fCount = count;
	}
	};

	static void make0(ColorPos* rec) {
	#if 0
	From http://jsfiddle.net/3fe2a/

	background-image: -webkit-linear-gradient(left, #22d1cd 1%, #22d1cd 0.9510157507590116%, #df4b37 2.9510157507590113%, #df4b37 23.695886056604927%, #22d1cd 25.695886056604927%, #22d1cd 25.39321881940624%, #e6de36 27.39321881940624%, #e6de36 31.849399922570655%, #3267ff 33.849399922570655%, #3267ff 44.57735802921938%, #9d47d1 46.57735802921938%, #9d47d1 53.27185850805876%, #3267ff 55.27185850805876%, #3267ff 61.95718972227316%, #5cdd9d 63.95718972227316%, #5cdd9d 69.89166004442%, #3267ff 71.89166004442%, #3267ff 74.45795382765857%, #9d47d1 76.45795382765857%, #9d47d1 82.78364610713776%, #3267ff 84.78364610713776%, #3267ff 94.52743647737229%, #e3d082 96.52743647737229%, #e3d082 96.03934633331295%);
	height: 30px;
	#endif

	const SkColor colors[] = {
	0xFF22d1cd, 0xFF22d1cd, 0xFFdf4b37, 0xFFdf4b37, 0xFF22d1cd, 0xFF22d1cd, 0xFFe6de36, 0xFFe6de36,
	0xFF3267ff, 0xFF3267ff, 0xFF9d47d1, 0xFF9d47d1, 0xFF3267ff, 0xFF3267ff, 0xFF5cdd9d, 0xFF5cdd9d,
	0xFF3267ff, 0xFF3267ff, 0xFF9d47d1, 0xFF9d47d1, 0xFF3267ff, 0xFF3267ff, 0xFFe3d082, 0xFFe3d082
	};
	const double percent[] = {
	1, 0.9510157507590116, 2.9510157507590113, 23.695886056604927,
	25.695886056604927, 25.39321881940624, 27.39321881940624, 31.849399922570655,
	33.849399922570655, 44.57735802921938, 46.57735802921938, 53.27185850805876,
	55.27185850805876, 61.95718972227316, 63.95718972227316, 69.89166004442,
	71.89166004442, 74.45795382765857, 76.45795382765857, 82.78364610713776,
	84.78364610713776, 94.52743647737229, 96.52743647737229, 96.03934633331295,
	};
	const int N = SK_ARRAY_COUNT(percent);
	SkScalar pos[N];
	for (int i = 0; i < N; ++i) {
	pos[i] = SkDoubleToScalar(percent[i] / 100);
	}
	rec->construct(colors, pos, N);
	}

	static void make1(ColorPos* rec) {
	const SkColor colors[] = {
	SK_ColorBLACK, SK_ColorWHITE, SK_ColorBLACK, SK_ColorWHITE,
	SK_ColorBLACK, SK_ColorWHITE, SK_ColorBLACK, SK_ColorWHITE,
	SK_ColorBLACK,
	};
	rec->construct(colors, nullptr, SK_ARRAY_COUNT(colors));
	}

	static void make2(ColorPos* rec) {
	const SkColor colors[] = {
	SK_ColorBLACK, SK_ColorWHITE, SK_ColorBLACK, SK_ColorWHITE,
	SK_ColorBLACK, SK_ColorWHITE, SK_ColorBLACK, SK_ColorWHITE,
	SK_ColorBLACK,
	};
	const int N = SK_ARRAY_COUNT(colors);
	SkScalar pos[N];
	for (int i = 0; i < N; ++i) {
	pos[i] = SK_Scalar1 * i / (N - 1);
	}
	rec->construct(colors, pos, N);
	}

	static void make3(ColorPos* rec) {
	const SkColor colors[] = {
	SK_ColorRED, SK_ColorBLUE, SK_ColorBLUE, SK_ColorGREEN, SK_ColorGREEN, SK_ColorBLACK,
	};
	const SkScalar pos[] = {
	0, 0, 0.5f, 0.5, 1, 1,
	};
	rec->construct(colors, pos, SK_ARRAY_COUNT(colors));
	}

	class GradientsManyColorsGM : public GM {
	enum {
	W = 800,
	};
	SkAutoTUnref<SkShader> fShader;

	typedef void (Proc)(ColorPos);
	public:
	GradientsManyColorsGM(bool dither) : fDither(dither) {}

	protected:

	SkString onShortName() override {
	return SkString(fDither ? "gradients_many" : "gradients_many_nodither");
	}

	SkISize onISize() override { return SkISize::Make(880, 400); }

	void onDraw(SkCanvas* canvas) override {
	const Proc procs[] = {
	make0, make1, make2, make3,
	};
	const SkPoint pts[] = {
	{ 0, 0 },
	{ SkIntToScalar(W), 0 },
	};
	const SkRect r = SkRect::MakeWH(SkIntToScalar(W), 30);

	SkPaint paint;
	paint.setDither(fDither);

	canvas->translate(40, 20);

	for (int i = 0; i <= 8; ++i) {
	SkScalar x = r.width() * i / 8;
	canvas->drawLine(x, 0, x, 10000, paint);
	}

	// expand the drawing rect so we exercise clampping in the gradients
	const SkRect drawR = r.makeOutset(20, 0);
	for (size_t i = 0; i < SK_ARRAY_COUNT(procs); ++i) {
	ColorPos rec;
	procs[i](&rec);
	SkShader* s = SkGradientShader::CreateLinear(pts, rec.fColors, rec.fPos, rec.fCount,
	SkShader::kClamp_TileMode);
	paint.setShader(s)->unref();
	canvas->drawRect(drawR, paint);

	canvas->save();
	canvas->translate(r.centerX(), r.height() + 4);
	canvas->scale(-1, 1);
	canvas->translate(-r.centerX(), 0);
	canvas->drawRect(drawR, paint);
	canvas->restore();

	canvas->translate(0, r.height() + 2*r.height() + 8);
	}
	}

	private:
	bool fDither;

	typedef GM INHERITED;
	};

	///////////////////////////////////////////////////////////////////////////////

	DEF_GM(return new GradientsNoTextureGM(true);)
	DEF_GM(return new GradientsNoTextureGM(false);)
	DEF_GM(return new GradientsManyColorsGM(true);)
	DEF_GM(return new GradientsManyColorsGM(false);)