/*
* 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;
};
constexpr SkColor gColors[] = {
SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE,
};
constexpr GradData gGradData[] = {
{ 1, gColors, nullptr },
{ 2, gColors, nullptr },
{ 3, gColors, nullptr },
{ 4, gColors, nullptr },
};
static sk_sp<SkShader> MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
return SkGradientShader::MakeLinear(pts, data.fColors, data.fPos, data.fCount, tm);
}
static sk_sp<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::MakeRadial(center, center.fX, data.fColors, data.fPos, data.fCount, tm);
}
static sk_sp<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::MakeSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount);
}
static sk_sp<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::MakeTwoPointConical(
center1, (pts[1].fX - pts[0].fX) / 7,
center0, (pts[1].fX - pts[0].fX) / 2,
data.fColors, data.fPos, data.fCount, tm);
}
static sk_sp<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::MakeTwoPointConical(center1, radius1,
center0, radius0,
data.fColors, data.fPos,
data.fCount, tm);
}
typedef sk_sp<SkShader> (*GradMaker)(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm);
constexpr GradMaker gGradMakers[] = {
MakeLinear, MakeRadial, MakeSweep, Make2Radial, Make2Conical,
};
///////////////////////////////////////////////////////////////////////////////
class GradientsNoTextureGM : public GM {
public:
GradientsNoTextureGM(bool dither) : fDither(dither) {
this->setBGColor(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 {
constexpr SkPoint kPts[2] = { { 0, 0 },
{ SkIntToScalar(50), SkIntToScalar(50) } };
constexpr 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));
constexpr 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) {
paint.setShader(gGradMakers[j](kPts, gGradData[i], kTM));
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,
};
sk_sp<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);
paint.setShader(SkGradientShader::MakeLinear(pts, rec.fColors, rec.fPos, rec.fCount,
SkShader::kClamp_TileMode));
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);)