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/*
* 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 "SkImageDecoder.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 {
SkImageDecoder* codec = nullptr;
SkString resourcePath = GetResourcePath("color_wheel.png");
SkFILEStream stream(resourcePath.c_str());
if (stream.isValid()) {
codec = SkImageDecoder::Factory(&stream);
}
if (codec) {
stream.rewind();
codec->decode(&stream, &fBM, kN32_SkColorType, SkImageDecoder::kDecodePixels_Mode);
delete codec;
} else {
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::Create(SK_ColorWHITE,
5,
SkAvoidXfermode::kTargetColor_Mode))->unref();
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::Create(SK_ColorWHITE,
250,
SkAvoidXfermode::kAvoidColor_Mode))->unref();
canvas->drawRect(r, p2);
r.offsetTo(0.0f, 64);
// LL corner: replace red with blue with a loose tolerance
SkPaint p3;
p3.setColor(SK_ColorBLUE);
p3.setXfermode(SkAvoidXfermode::Create(SK_ColorRED,
250,
SkAvoidXfermode::kTargetColor_Mode))->unref();
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::Create(SK_ColorRED,
5,
SkAvoidXfermode::kAvoidColor_Mode))->unref();
canvas->drawRect(r, p4);
}
private:
SkBitmap fBM;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new AvoidXfermodeGM;)
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