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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 "SkPorterDuff.h"
#include "SkXfermode.h"
#ifdef SK_SUPPORT_LEGACY_PORTER_DUFF
/* This file just exists as a compatibility layer, gluing the PorterDuff API
into the (extended) SkXfermode API
*/
#define MAKE_PAIR(mode) { SkPorterDuff::k##mode##_Mode, SkXfermode::k##mode##_Mode }
// this table must be in SkPorterDuff::Mode order, so it can be indexed directly
// with a porterduff mode.
static const struct Pair {
SkPorterDuff::Mode fPD;
SkXfermode::Mode fXF;
} gPairs[] = {
MAKE_PAIR(Clear),
MAKE_PAIR(Src),
MAKE_PAIR(Dst),
MAKE_PAIR(SrcOver),
MAKE_PAIR(DstOver),
MAKE_PAIR(SrcIn),
MAKE_PAIR(DstIn),
MAKE_PAIR(SrcOut),
MAKE_PAIR(DstOut),
MAKE_PAIR(SrcATop),
MAKE_PAIR(DstATop),
MAKE_PAIR(Xor),
MAKE_PAIR(Darken),
MAKE_PAIR(Lighten),
MAKE_PAIR(Modulate),
MAKE_PAIR(Screen),
{ SkPorterDuff::kAdd_Mode, SkXfermode::kPlus_Mode },
#ifdef SK_BUILD_FOR_ANDROID
MAKE_PAIR(Overlay),
#endif
};
static bool find_pdmode(SkXfermode::Mode src, SkPorterDuff::Mode* dst) {
const Pair* pairs = gPairs;
for (size_t i = 0; i < SK_ARRAY_COUNT(gPairs); i++) {
if (pairs[i].fXF == src) {
if (dst) {
*dst = pairs[i].fPD;
}
return true;
}
}
return false;
}
SkXfermode::Mode SkPorterDuff::ToXfermodeMode(Mode mode) {
SkASSERT((unsigned)mode < SkPorterDuff::kModeCount);
const Pair& pair = gPairs[mode];
SkASSERT(pair.fPD == mode);
return pair.fXF;
}
SkXfermode* SkPorterDuff::CreateXfermode(SkPorterDuff::Mode mode) {
const Pair& pair = gPairs[mode];
SkASSERT(pair.fPD == mode);
return SkXfermode::Create(pair.fXF);
}
bool SkPorterDuff::IsMode(SkXfermode* xfer, Mode* pdmode) {
SkXfermode::Mode xfmode;
if (!SkXfermode::AsMode(xfer, &xfmode)) {
return false;
}
return find_pdmode(xfmode, pdmode);
}
SkXfermodeProc SkPorterDuff::GetXfermodeProc(Mode mode) {
return SkXfermode::GetProc(gPairs[mode].fXF);
}
SkXfermodeProc16 SkPorterDuff::GetXfermodeProc16(Mode mode, SkColor srcColor) {
return SkXfermode::GetProc16(gPairs[mode].fXF, srcColor);
}
#endif
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