skia2/gm/avoidxfermode.cpp

82 lines
2.2 KiB
C++

/*
* Copyright 2016 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 "Resources.h"
#include "SkAvoidXfermode.h"
#include "SkStream.h"
class AvoidXfermodeGM : public skiagm::GM {
public:
AvoidXfermodeGM() { }
protected:
SkString onShortName() override {
return SkString("avoidxfermode");
}
SkISize onISize() override { return SkISize::Make(128, 128); }
void onOnceBeforeDraw() override {
if (!GetResourceAsBitmap("color_wheel.png", &fBM)) {
fBM.allocN32Pixels(1, 1);
fBM.eraseARGB(255, 255, 0 , 0); // red == bad
}
}
void onDraw(SkCanvas* canvas) override {
canvas->drawBitmap(fBM, 0, 0);
SkRect r = SkRect::MakeIWH(64, 64);
// UL corner: replace white with black with a tight tolerance
SkPaint p1;
p1.setColor(SK_ColorBLACK);
p1.setXfermode(SkAvoidXfermode::Make(SK_ColorWHITE, 5, SkAvoidXfermode::kTargetColor_Mode));
canvas->drawRect(r, p1);
r.offsetTo(64, 0.0f);
// UR corner: draw black everywhere except white with a tight tolerance
SkPaint p2;
p2.setColor(SK_ColorBLACK);
p2.setXfermode(SkAvoidXfermode::Make(SK_ColorWHITE, 250,
SkAvoidXfermode::kAvoidColor_Mode));
canvas->drawRect(r, p2);
r.offsetTo(0.0f, 64);
// LL corner: replace red with transparent blue with a loose tolerance
SkPaint p3;
p3.setColor(0x7F0000FF);
p3.setXfermode(SkAvoidXfermode::Make(SK_ColorRED, 250, SkAvoidXfermode::kTargetColor_Mode));
canvas->drawRect(r, p3);
r.offsetTo(64, 64);
// LR corner: draw black everywhere except red with a loose tolerance
SkPaint p4;
p4.setColor(SK_ColorBLACK);
p4.setXfermode(SkAvoidXfermode::Make(SK_ColorRED, 5, SkAvoidXfermode::kAvoidColor_Mode));
canvas->drawRect(r, p4);
}
private:
SkBitmap fBM;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new AvoidXfermodeGM;)