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/*
* 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, NULL },
{ 2, gColors, NULL },
{ 3, gColors, NULL },
{ 4, gColors, NULL },
};
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, 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 GradientsNoTextureGM : public GM {
public:
GradientsNoTextureGM() {
this->setBGColor(0xFFDDDDDD);
}
protected:
SkString onShortName() SK_OVERRIDE { return SkString("gradients_no_texture"); }
virtual SkISize onISize() SK_OVERRIDE { return make_isize(640, 615); }
virtual void onDraw(SkCanvas* canvas) SK_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);
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, NULL);
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:
typedef GM INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
DEF_GM( return SkNEW(GradientsNoTextureGM));
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