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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 "SkBitmap.h"
#include "SkRandom.h"
#include "SkShader.h"
#include "SkXfermode.h"
namespace skiagm {
/**
* Renders overlapping shapes with random SkXfermode::Modes against a checkerboard.
*/
class MixedXfermodesGM : public GM {
public:
MixedXfermodesGM() {
}
protected:
enum ShapeType {
kShapeTypeCircle,
kShapeTypeRoundRect,
kShapeTypeRect,
kShapeTypeConvexPath,
kShapeTypeConcavePath,
kNumShapeTypes
};
SkString onShortName() override {
return SkString("mixed_xfermodes");
}
SkISize onISize() override {
return SkISize::Make(790, 640);
}
void drawShape(SkCanvas* canvas,
const SkPaint& paint,
ShapeType type) {
static const SkRect kRect = SkRect::MakeXYWH(SkIntToScalar(-50), SkIntToScalar(-50),
SkIntToScalar(75), SkIntToScalar(105));
switch (type) {
case kShapeTypeCircle:
canvas->drawCircle(0, 0, 50, paint);
break;
case kShapeTypeRoundRect:
canvas->drawRoundRect(kRect, SkIntToScalar(10), SkIntToScalar(20), paint);
break;
case kShapeTypeRect:
canvas->drawRect(kRect, paint);
break;
case kShapeTypeConvexPath:
if (fConvexPath.isEmpty()) {
SkPoint points[4];
kRect.toQuad(points);
fConvexPath.moveTo(points[0]);
fConvexPath.quadTo(points[1], points[2]);
fConvexPath.quadTo(points[3], points[0]);
SkASSERT(fConvexPath.isConvex());
}
canvas->drawPath(fConvexPath, paint);
break;
case kShapeTypeConcavePath:
if (fConcavePath.isEmpty()) {
SkPoint points[5] = {{0, SkIntToScalar(-50)} };
SkMatrix rot;
rot.setRotate(SkIntToScalar(360) / 5);
for (int i = 1; i < 5; ++i) {
rot.mapPoints(points + i, points + i - 1, 1);
}
fConcavePath.moveTo(points[0]);
for (int i = 0; i < 5; ++i) {
fConcavePath.lineTo(points[(2 * i) % 5]);
}
fConcavePath.setFillType(SkPath::kEvenOdd_FillType);
SkASSERT(!fConcavePath.isConvex());
}
canvas->drawPath(fConcavePath, paint);
break;
default:
break;
}
}
void onDraw(SkCanvas* canvas) override {
if (NULL == fBG.get()) {
static uint32_t kCheckerPixelData[] = { 0xFFFFFFFF,
0xFFCCCCCC,
0xFFCCCCCC,
0xFFFFFFFF };
SkBitmap bitmap;
bitmap.allocN32Pixels(2, 2);
memcpy(bitmap.getPixels(), kCheckerPixelData, sizeof(kCheckerPixelData));
SkMatrix lm;
lm.setScale(SkIntToScalar(20), SkIntToScalar(20));
fBG.reset(SkShader::CreateBitmapShader(bitmap,
SkShader::kRepeat_TileMode,
SkShader::kRepeat_TileMode,
&lm));
}
SkPaint bgPaint;
bgPaint.setShader(fBG.get());
canvas->drawPaint(bgPaint);
SkISize size = canvas->getDeviceSize();
SkScalar maxScale = SkScalarSqrt((SkIntToScalar(size.fWidth * size.fHeight))) / 300;
SkRandom random;
for (int i = 0; i < kNumShapes; ++i) {
SkScalar s = random.nextRangeScalar(SK_Scalar1 / 8, SK_Scalar1) * maxScale;
SkScalar r = random.nextRangeScalar(0, SkIntToScalar(360));
SkScalar dx = random.nextRangeScalar(0, SkIntToScalar(size.fWidth));
SkScalar dy = random.nextRangeScalar(0, SkIntToScalar(size.fHeight));
SkColor color = random.nextU();
SkXfermode::Mode mode =
static_cast<SkXfermode::Mode>(random.nextULessThan(SkXfermode::kLastMode + 1));
ShapeType shapeType = static_cast<ShapeType>(random.nextULessThan(kNumShapeTypes));
SkPaint p;
p.setAntiAlias(true);
p.setColor(color);
p.setXfermodeMode(mode);
canvas->save();
canvas->translate(dx, dy);
canvas->scale(s, s);
canvas->rotate(r);
this->drawShape(canvas, p, shapeType);
canvas->restore();
}
// This draw should not affect the test's result.
drawWithHueOnWhite(canvas);
}
/**
* Draws white color into a white square using the hue blend mode.
* The result color should be white, so it doesn't change the expectations.
* This will test a divide by 0 bug in shaders' setLum function,
* which used to output black pixels.
*/
void drawWithHueOnWhite(SkCanvas* canvas) {
SkColor color = SkColorSetARGBMacro(225, 255, 255, 255);
SkXfermode::Mode mode = SkXfermode::kHue_Mode;
ShapeType shapeType = kShapeTypeConvexPath;
// Make it fit into a square.
SkScalar s = 0.15f;
// Look for a clean white square.
SkScalar dx = 30.f;
SkScalar dy = 350.f;
SkPaint p;
p.setAntiAlias(true);
p.setColor(color);
p.setXfermodeMode(mode);
canvas->save();
canvas->translate(dx, dy);
canvas->scale(s, s);
this->drawShape(canvas, p, shapeType);
canvas->restore();
}
private:
enum {
kNumShapes = 100,
};
SkAutoTUnref<SkShader> fBG;
SkPath fConcavePath;
SkPath fConvexPath;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static GM* MyFactory(void*) { return new MixedXfermodesGM; }
static GMRegistry reg(MyFactory);
}
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