| /* |
| * 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 "SkXfermodeInterpretation.h" |
| #include "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 SkXfermode* xfer = paint.getXfermode(); |
| SkXfermode::Mode mode; |
| if (!SkXfermode::AsMode(xfer, &mode)) { |
| return kNormal_SkXfermodeInterpretation; |
| } |
| switch (mode) { |
| case SkXfermode::kSrcOver_Mode: |
| return kSrcOver_SkXfermodeInterpretation; |
| case SkXfermode::kSrc_Mode: |
| if (just_solid_color(paint)) { |
| return kSrcOver_SkXfermodeInterpretation; |
| } |
| return kNormal_SkXfermodeInterpretation; |
| case SkXfermode::kDst_Mode: |
| return kSkipDrawing_SkXfermodeInterpretation; |
| case SkXfermode::kDstOver_Mode: |
| if (dstIsOpaque) { |
| return kSkipDrawing_SkXfermodeInterpretation; |
| } |
| return kNormal_SkXfermodeInterpretation; |
| case SkXfermode::kSrcIn_Mode: |
| if (dstIsOpaque && just_solid_color(paint)) { |
| return kSrcOver_SkXfermodeInterpretation; |
| } |
| return kNormal_SkXfermodeInterpretation; |
| case SkXfermode::kDstIn_Mode: |
| if (just_solid_color(paint)) { |
| return kSkipDrawing_SkXfermodeInterpretation; |
| } |
| return kNormal_SkXfermodeInterpretation; |
| default: |
| return kNormal_SkXfermodeInterpretation; |
| } |
| } |