blob: 607f4c995d8b7166f680d4f437e65a6d6be52a16 [file] [log] [blame]
/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "src/core/SkXfermodeInterpretation.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkPaint.h"
static bool just_solid_color(const SkPaint& p) {
return SK_AlphaOPAQUE == p.getAlpha() && !p.getColorFilter() && !p.getShader();
}
SkXfermodeInterpretation SkInterpretXfermode(const SkPaint& paint, bool dstIsOpaque) {
const auto bm = paint.asBlendMode();
if (!bm) {
return kNormal_SkXfermodeInterpretation;
}
switch (bm.value()) {
case SkBlendMode::kSrcOver:
return kSrcOver_SkXfermodeInterpretation;
case SkBlendMode::kSrc:
if (just_solid_color(paint)) {
return kSrcOver_SkXfermodeInterpretation;
}
return kNormal_SkXfermodeInterpretation;
case SkBlendMode::kDst:
return kSkipDrawing_SkXfermodeInterpretation;
case SkBlendMode::kDstOver:
if (dstIsOpaque) {
return kSkipDrawing_SkXfermodeInterpretation;
}
return kNormal_SkXfermodeInterpretation;
case SkBlendMode::kSrcIn:
if (dstIsOpaque && just_solid_color(paint)) {
return kSrcOver_SkXfermodeInterpretation;
}
return kNormal_SkXfermodeInterpretation;
case SkBlendMode::kDstIn:
if (just_solid_color(paint)) {
return kSkipDrawing_SkXfermodeInterpretation;
}
return kNormal_SkXfermodeInterpretation;
default:
return kNormal_SkXfermodeInterpretation;
}
}