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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 "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkLumaXfermode.h"
static SkScalar kSize = 80;
static SkScalar kInset = 10;
static SkColor kColor1 = SkColorSetARGB(0xff, 0xff, 0xff, 0);
static SkColor kColor2 = SkColorSetARGB(0xff, 0x80, 0xff, 0);
static void draw_label(SkCanvas* canvas, const char* label,
const SkPoint& offset) {
SkPaint paint;
size_t len = strlen(label);
SkScalar width = paint.measureText(label, len);
canvas->drawText(label, len, offset.x() - width / 2, offset.y(),
paint);
}
static void draw_scene(SkCanvas* canvas, SkXfermode* mode, bool aa,
SkShader* s1, SkShader* s2) {
SkPaint paint;
paint.setAntiAlias(aa);
SkRect r, c, bounds = SkRect::MakeWH(kSize, kSize);
c = bounds;
c.fRight = bounds.centerX();
canvas->drawRect(bounds, paint);
canvas->saveLayer(&bounds, NULL);
r = bounds;
r.inset(kInset, 0);
paint.setShader(s1);
paint.setColor(s1 ? SK_ColorBLACK : SkColorSetA(kColor1, 0x80));
canvas->drawOval(r, paint);
if (!s1) {
canvas->save();
canvas->clipRect(c);
paint.setColor(s1 ? SK_ColorBLACK : kColor1);
canvas->drawOval(r, paint);
canvas->restore();
}
SkPaint xferPaint;
xferPaint.setXfermode(mode);
canvas->saveLayer(&bounds, &xferPaint);
r = bounds;
r.inset(0, kInset);
paint.setShader(s2);
paint.setColor(s2 ? SK_ColorBLACK : SkColorSetA(kColor2, 0x80));
canvas->drawOval(r, paint);
if (!s2) {
canvas->save();
canvas->clipRect(c);
paint.setColor(s2 ? SK_ColorBLACK : kColor2);
canvas->drawOval(r, paint);
canvas->restore();
}
canvas->restore();
canvas->restore();
}
class LumaXfermodeGM : public skiagm::GM {
public:
LumaXfermodeGM() {
fSrcInXfer.reset(SkLumaMaskXfermode::Create(SkXfermode::kSrcIn_Mode));
fDstInXfer.reset(SkLumaMaskXfermode::Create(SkXfermode::kDstIn_Mode));
fSrcOverXfer.reset(SkLumaMaskXfermode::Create(SkXfermode::kSrcOver_Mode));
SkColor g1Colors[] = { kColor1, SkColorSetA(kColor1, 0x20) };
SkColor g2Colors[] = { kColor2, SkColorSetA(kColor2, 0x20) };
SkPoint g1Points[] = { { 0, 0 }, { 0, 100 } };
SkPoint g2Points[] = { { 0, 0 }, { kSize, 0 } };
SkScalar pos[] = { 0.2f, 1.0f };
fGr1.reset(SkGradientShader::CreateLinear(g1Points,
g1Colors,
pos,
SK_ARRAY_COUNT(g1Colors),
SkShader::kClamp_TileMode));
fGr2.reset(SkGradientShader::CreateLinear(g2Points,
g2Colors,
pos,
SK_ARRAY_COUNT(g2Colors),
SkShader::kClamp_TileMode));
}
protected:
virtual SkString onShortName() SK_OVERRIDE {
return SkString("lumamode");
}
virtual SkISize onISize() SK_OVERRIDE {
return SkISize::Make(800, 420);
}
virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
SkXfermode* modes[] = { NULL, fSrcInXfer, fDstInXfer, fSrcOverXfer };
struct {
SkShader* fShader1;
SkShader* fShader2;
} shaders[] = {
{ NULL, NULL },
{ NULL, fGr2 },
{ fGr1, NULL },
{ fGr1, fGr2 },
};
SkScalar gridStep = kSize + 2 * kInset;
draw_label(canvas, "SrcOver", SkPoint::Make(gridStep, 20));
draw_label(canvas, "SrcInLuma", SkPoint::Make(gridStep * 3, 20));
draw_label(canvas, "DstInLuma", SkPoint::Make(gridStep * 5, 20));
draw_label(canvas, "SrcOverLuma", SkPoint::Make(gridStep * 7, 20));
for (size_t i = 0; i < SK_ARRAY_COUNT(shaders); ++i) {
canvas->save();
canvas->translate(kInset, gridStep * i + 30);
for (size_t m = 0; m < SK_ARRAY_COUNT(modes); ++m) {
draw_scene(canvas, modes[m], true, shaders[i].fShader1,
shaders[i].fShader2);
canvas->translate(gridStep, 0);
draw_scene(canvas, modes[m], false, shaders[i].fShader1,
shaders[i].fShader2);
canvas->translate(gridStep, 0);
}
canvas->restore();
}
}
private:
SkAutoTUnref<SkShader> fGr1, fGr2;
SkAutoTUnref<SkXfermode> fSrcInXfer, fDstInXfer, fSrcOverXfer;
typedef skiagm::GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return SkNEW(LumaXfermodeGM); )
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