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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkPixelXorXfermode.h"
#include "SkColorPriv.h"
#include "SkFlattenableBuffers.h"
#include "SkString.h"
// we always return an opaque color, 'cause I don't know what to do with
// the alpha-component and still return a valid premultiplied color.
SkPMColor SkPixelXorXfermode::xferColor(SkPMColor src, SkPMColor dst) const {
SkPMColor res = src ^ dst ^ fOpColor;
res |= (SK_A32_MASK << SK_A32_SHIFT); // force it to be opaque
return res;
}
void SkPixelXorXfermode::flatten(SkFlattenableWriteBuffer& wb) const {
this->INHERITED::flatten(wb);
wb.writeColor(fOpColor);
}
SkPixelXorXfermode::SkPixelXorXfermode(SkFlattenableReadBuffer& rb)
: INHERITED(rb) {
fOpColor = rb.readColor();
}
#ifdef SK_DEVELOPER
void SkPixelXorXfermode::toString(SkString* str) const {
str->append("SkPixelXorXfermode: ");
str->appendHex(fOpColor);
}
#endif
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