/*
* 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"
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 GradData gGradData[] = {
{ 2, gColors, NULL },
{ 2, gColors, gPos0 },
{ 2, gColors, gPos1 },
{ 5, gColors, NULL },
{ 5, gColors, gPos2 }
};
static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, SkUnitMapper* mapper) {
return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos,
data.fCount, tm, mapper);
}
static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, SkUnitMapper* mapper) {
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, mapper);
}
static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, SkUnitMapper* mapper) {
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, mapper);
}
static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, SkUnitMapper* mapper) {
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::CreateTwoPointRadial(
center1, (pts[1].fX - pts[0].fX) / 7,
center0, (pts[1].fX - pts[0].fX) / 2,
data.fColors, data.fPos, data.fCount, tm, mapper);
}
static SkShader* Make2Conical(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, SkUnitMapper* mapper) {
SkPoint center0, center1;
SkScalar radius0 = SkScalarDiv(pts[1].fX - pts[0].fX, 10);
SkScalar radius1 = SkScalarDiv(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, mapper);
}
typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, SkUnitMapper* mapper);
static const GradMaker gGradMakers[] = {
MakeLinear, MakeRadial, MakeSweep, Make2Radial, Make2Conical
};
///////////////////////////////////////////////////////////////////////////////
class GradientsGM : public GM {
public:
GradientsGM() {
this->setBGColor(0xFFDDDDDD);
}
protected:
SkString onShortName() {
return SkString("gradients");
}
virtual SkISize onISize() { return make_isize(640, 615); }
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);
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++) {
SkShader* shader = gGradMakers[j](pts, gGradData[i], tm, NULL);
paint.setShader(shader);
canvas->drawRect(r, paint);
shader->unref();
canvas->translate(0, SkIntToScalar(120));
}
canvas->restore();
canvas->translate(SkIntToScalar(120), 0);
}
}
private:
typedef GM INHERITED;
};
// Based on the original gradient slide, but with perspective applied to the
// gradient shaders' local matrices
class GradientsLocalPerspectiveGM : public GM {
public:
GradientsLocalPerspectiveGM() {
this->setBGColor(0xFFDDDDDD);
}
protected:
SkString onShortName() {
return SkString("gradients_local_perspective");
}
virtual SkISize onISize() { return make_isize(640, 615); }
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);
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++) {
SkShader* shader = gGradMakers[j](pts, gGradData[i], tm, NULL);
// apply an increasing y perspective as we move to the right
SkMatrix perspective;
perspective.setIdentity();
perspective.setPerspY(SkScalarDiv(SkIntToScalar((unsigned) i+1),
SkIntToScalar(500)));
perspective.setSkewX(SkScalarDiv(SkIntToScalar((unsigned) i+1),
SkIntToScalar(10)));
shader->setLocalMatrix(perspective);
paint.setShader(shader);
canvas->drawRect(r, paint);
shader->unref();
canvas->translate(0, SkIntToScalar(120));
}
canvas->restore();
canvas->translate(SkIntToScalar(120), 0);
}
}
private:
typedef GM INHERITED;
};
// Based on the original gradient slide, but with perspective applied to
// the view matrix
class GradientsViewPerspectiveGM : public GradientsGM {
protected:
SkString onShortName() {
return SkString("gradients_view_perspective");
}
virtual SkISize onISize() { return make_isize(640, 400); }
virtual void onDraw(SkCanvas* canvas) {
SkMatrix perspective;
perspective.setIdentity();
perspective.setPerspY(SkScalarDiv(SK_Scalar1, SkIntToScalar(1000)));
perspective.setSkewX(SkScalarDiv(SkIntToScalar(8), SkIntToScalar(25)));
canvas->concat(perspective);
INHERITED::onDraw(canvas);
}
private:
typedef GradientsGM INHERITED;
};
/*
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() {}
protected:
SkString onShortName() {
return SkString("gradients_degenerate_2pt");
}
virtual SkISize onISize() { return make_isize(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, SkFloatToScalar(0.01f), SkFloatToScalar(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::CreateTwoPointRadial(c0, r0, c1, r1, colors,
pos, SK_ARRAY_COUNT(pos),
SkShader::kClamp_TileMode);
SkPaint paint;
paint.setShader(s)->unref();
canvas->drawPaint(paint);
}
private:
typedef GM INHERITED;
};
/// Tests correctness of *optimized* codepaths in gradients.
class ClampedGradientsGM : public GM {
public:
ClampedGradientsGM() {}
protected:
SkString onShortName() { return SkString("clamped_gradients"); }
virtual SkISize onISize() { return make_isize(640, 510); }
void drawBG(SkCanvas* canvas) {
canvas->drawColor(0xFFDDDDDD);
}
virtual void onDraw(SkCanvas* canvas) {
this->drawBG(canvas);
SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(300) };
SkPaint paint;
paint.setAntiAlias(true);
SkPoint center;
center.iset(0, 300);
canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
SkShader* shader = SkGradientShader::CreateRadial(
SkPoint(center),
SkIntToScalar(200), gColors, NULL, 5,
SkShader::kClamp_TileMode, NULL);
paint.setShader(shader);
canvas->drawRect(r, paint);
shader->unref();
}
private:
typedef GM INHERITED;
};
/// Checks quality of large radial gradients, which may display
/// some banding.
class RadialGradientGM : public GM {
public:
RadialGradientGM() {}
protected:
SkString onShortName() { return SkString("radial_gradient"); }
virtual SkISize onISize() { return make_isize(1280, 1280); }
void drawBG(SkCanvas* canvas) {
canvas->drawColor(0xFF000000);
}
virtual void onDraw(SkCanvas* canvas) {
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[] = { SkFloatToScalar(0.0f),
SkFloatToScalar(0.35f),
SkFloatToScalar(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;
};
///////////////////////////////////////////////////////////////////////////////
static GM* MyFactory(void*) { return new GradientsGM; }
static GMRegistry reg(MyFactory);
static GM* MyFactory2(void*) { return new GradientsDegenrate2PointGM; }
static GMRegistry reg2(MyFactory2);
static GM* MyFactory3(void*) { return new ClampedGradientsGM; }
static GMRegistry reg3(MyFactory3);
static GM* MyFactory4(void*) { return new RadialGradientGM; }
static GMRegistry reg4(MyFactory4);
static GM* MyFactory5(void*) { return new GradientsLocalPerspectiveGM; }
static GMRegistry reg5(MyFactory5);
static GM* MyFactory6(void*) { return new GradientsViewPerspectiveGM; }
static GMRegistry reg6(MyFactory6);
}