junov@chromium.org | baa0220 | 2013-01-24 14:38:23 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2013 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
| 8 | #include "SkPaintPriv.h" |
| 9 | |
| 10 | #include "SkBitmap.h" |
| 11 | #include "SkColorFilter.h" |
| 12 | #include "SkPaint.h" |
| 13 | #include "SkShader.h" |
| 14 | |
| 15 | bool isPaintOpaque(const SkPaint* paint, |
| 16 | const SkBitmap* bmpReplacesShader) { |
| 17 | // TODO: SkXfermode should have a virtual isOpaque method, which would |
| 18 | // make it possible to test modes that do not have a Coeff representation. |
| 19 | |
| 20 | if (!paint) { |
| 21 | return bmpReplacesShader ? bmpReplacesShader->isOpaque() : true; |
| 22 | } |
| 23 | |
| 24 | SkXfermode::Coeff srcCoeff, dstCoeff; |
| 25 | if (SkXfermode::AsCoeff(paint->getXfermode(), &srcCoeff, &dstCoeff)){ |
| 26 | if (SkXfermode::kDA_Coeff == srcCoeff || SkXfermode::kDC_Coeff == srcCoeff || |
| 27 | SkXfermode::kIDA_Coeff == srcCoeff || SkXfermode::kIDC_Coeff == srcCoeff) { |
| 28 | return false; |
| 29 | } |
| 30 | switch (dstCoeff) { |
| 31 | case SkXfermode::kZero_Coeff: |
| 32 | return true; |
| 33 | case SkXfermode::kISA_Coeff: |
| 34 | if (paint->getAlpha() != 255) { |
| 35 | break; |
| 36 | } |
| 37 | if (bmpReplacesShader) { |
| 38 | if (!bmpReplacesShader->isOpaque()) { |
| 39 | break; |
| 40 | } |
| 41 | } else if (paint->getShader() && !paint->getShader()->isOpaque()) { |
| 42 | break; |
| 43 | } |
| 44 | if (paint->getColorFilter() && |
| 45 | ((paint->getColorFilter()->getFlags() & |
| 46 | SkColorFilter::kAlphaUnchanged_Flag) == 0)) { |
| 47 | break; |
| 48 | } |
| 49 | return true; |
| 50 | case SkXfermode::kSA_Coeff: |
| 51 | if (paint->getAlpha() != 0) { |
| 52 | break; |
| 53 | } |
| 54 | if (paint->getColorFilter() && |
| 55 | ((paint->getColorFilter()->getFlags() & |
| 56 | SkColorFilter::kAlphaUnchanged_Flag) == 0)) { |
| 57 | break; |
| 58 | } |
| 59 | return true; |
| 60 | case SkXfermode::kSC_Coeff: |
| 61 | if (paint->getColor() != 0) { // all components must be 0 |
| 62 | break; |
| 63 | } |
| 64 | if (bmpReplacesShader || paint->getShader()) { |
| 65 | break; |
| 66 | } |
| 67 | if (paint->getColorFilter() && ( |
| 68 | (paint->getColorFilter()->getFlags() & |
| 69 | SkColorFilter::kAlphaUnchanged_Flag) == 0)) { |
| 70 | break; |
| 71 | } |
| 72 | return true; |
| 73 | default: |
| 74 | break; |
| 75 | } |
| 76 | } |
| 77 | return false; |
| 78 | } |
commit-bot@chromium.org | 0205aba | 2014-05-06 12:02:22 +0000 | [diff] [blame] | 79 | |
| 80 | bool NeedsDeepCopy(const SkPaint& paint) { |
| 81 | /* |
commit-bot@chromium.org | 9cb4283 | 2014-05-14 16:32:31 +0000 | [diff] [blame] | 82 | * The types below are not yet immutable/reentrant-safe, and so we return |
| 83 | * true if instances of them are present in the paint. |
commit-bot@chromium.org | 0205aba | 2014-05-06 12:02:22 +0000 | [diff] [blame] | 84 | * |
commit-bot@chromium.org | 9cb4283 | 2014-05-14 16:32:31 +0000 | [diff] [blame] | 85 | * Eventually we hope this list will be empty, and we can always return |
| 86 | * false. |
commit-bot@chromium.org | 0205aba | 2014-05-06 12:02:22 +0000 | [diff] [blame] | 87 | */ |
commit-bot@chromium.org | 9cb4283 | 2014-05-14 16:32:31 +0000 | [diff] [blame] | 88 | return false |
| 89 | #ifdef SK_SUPPORT_LEGACY_SHADER_LOCALMATRIX |
| 90 | || paint.getShader() |
commit-bot@chromium.org | 0205aba | 2014-05-06 12:02:22 +0000 | [diff] [blame] | 91 | #endif |
commit-bot@chromium.org | 9cb4283 | 2014-05-14 16:32:31 +0000 | [diff] [blame] | 92 | || paint.getImageFilter() |
| 93 | ; |
commit-bot@chromium.org | 0205aba | 2014-05-06 12:02:22 +0000 | [diff] [blame] | 94 | } |