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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 "SkPixelXorXfermode.h"
#include "SkStream.h"
class PixelXorXfermodeGM : public skiagm::GM {
public:
PixelXorXfermodeGM() { }
protected:
SkString onShortName() override {
return SkString("pixelxorxfermode");
}
SkISize onISize() override { return SkISize::Make(512, 512); }
void onOnceBeforeDraw() override {
SkImageDecoder* codec = nullptr;
SkString resourcePath = GetResourcePath("mandrill_512.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(256, 256);
// Negate the red channel of the dst (via the ancillary color) but leave
// the green & blue channels alone
SkPaint p1;
p1.setColor(SK_ColorBLACK); // noop
p1.setXfermode(SkPixelXorXfermode::Create(0x7FFF0000))->unref();
canvas->drawRect(r, p1);
r.offsetTo(256.0f, 0.0f);
// Negate the dst color via the src color
SkPaint p2;
p2.setColor(SK_ColorWHITE);
p2.setXfermode(SkPixelXorXfermode::Create(SK_ColorBLACK))->unref(); // noop
canvas->drawRect(r, p2);
r.offsetTo(0.0f, 256.0f);
// Just return the original color
SkPaint p3;
p3.setColor(SK_ColorBLACK); // noop
p3.setXfermode(SkPixelXorXfermode::Create(SK_ColorBLACK))->unref(); // noop
canvas->drawRect(r, p3);
r.offsetTo(256.0f, 256.0f);
// Negate the red & green channels (via the ancillary color) but leave
// the blue channel alone
SkPaint p4;
p4.setColor(SK_ColorBLACK); // noop
p4.setXfermode(SkPixelXorXfermode::Create(SK_ColorYELLOW))->unref();
canvas->drawRect(r, p4);
}
private:
SkBitmap fBM;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new PixelXorXfermodeGM;)
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