tfarina@chromium.org | 883fe7f | 2013-07-16 13:05:27 +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 "SkFilterShader.h" |
| 9 | |
| 10 | #include "SkColorFilter.h" |
| 11 | #include "SkFlattenableBuffers.h" |
| 12 | #include "SkShader.h" |
| 13 | #include "SkString.h" |
| 14 | |
| 15 | SkFilterShader::SkFilterShader(SkShader* shader, SkColorFilter* filter) { |
| 16 | fShader = shader; |
| 17 | shader->ref(); |
| 18 | |
| 19 | fFilter = filter; |
| 20 | filter->ref(); |
| 21 | } |
| 22 | |
| 23 | SkFilterShader::SkFilterShader(SkFlattenableReadBuffer& buffer) |
| 24 | : INHERITED(buffer) { |
| 25 | fShader = buffer.readFlattenableT<SkShader>(); |
| 26 | fFilter = buffer.readFlattenableT<SkColorFilter>(); |
| 27 | } |
| 28 | |
| 29 | SkFilterShader::~SkFilterShader() { |
| 30 | fFilter->unref(); |
| 31 | fShader->unref(); |
| 32 | } |
| 33 | |
| 34 | void SkFilterShader::flatten(SkFlattenableWriteBuffer& buffer) const { |
| 35 | this->INHERITED::flatten(buffer); |
| 36 | buffer.writeFlattenable(fShader); |
| 37 | buffer.writeFlattenable(fFilter); |
| 38 | } |
| 39 | |
| 40 | uint32_t SkFilterShader::getFlags() { |
| 41 | uint32_t shaderF = fShader->getFlags(); |
| 42 | uint32_t filterF = fFilter->getFlags(); |
| 43 | |
| 44 | // if the filter doesn't support 16bit, clear the matching bit in the shader |
| 45 | if (!(filterF & SkColorFilter::kHasFilter16_Flag)) { |
| 46 | shaderF &= ~SkShader::kHasSpan16_Flag; |
| 47 | } |
| 48 | // if the filter might change alpha, clear the opaque flag in the shader |
| 49 | if (!(filterF & SkColorFilter::kAlphaUnchanged_Flag)) { |
| 50 | shaderF &= ~(SkShader::kOpaqueAlpha_Flag | SkShader::kHasSpan16_Flag); |
| 51 | } |
| 52 | return shaderF; |
| 53 | } |
| 54 | |
| 55 | bool SkFilterShader::setContext(const SkBitmap& device, |
| 56 | const SkPaint& paint, |
| 57 | const SkMatrix& matrix) { |
| 58 | // we need to keep the setContext/endContext calls balanced. If we return |
| 59 | // false, our endContext() will not be called. |
| 60 | |
| 61 | if (!this->INHERITED::setContext(device, paint, matrix)) { |
| 62 | return false; |
| 63 | } |
| 64 | if (!fShader->setContext(device, paint, matrix)) { |
| 65 | this->INHERITED::endContext(); |
| 66 | return false; |
| 67 | } |
| 68 | return true; |
| 69 | } |
| 70 | |
| 71 | void SkFilterShader::endContext() { |
| 72 | fShader->endContext(); |
| 73 | this->INHERITED::endContext(); |
| 74 | } |
| 75 | |
| 76 | void SkFilterShader::shadeSpan(int x, int y, SkPMColor result[], int count) { |
| 77 | fShader->shadeSpan(x, y, result, count); |
| 78 | fFilter->filterSpan(result, count, result); |
| 79 | } |
| 80 | |
| 81 | void SkFilterShader::shadeSpan16(int x, int y, uint16_t result[], int count) { |
| 82 | SkASSERT(fShader->getFlags() & SkShader::kHasSpan16_Flag); |
| 83 | SkASSERT(fFilter->getFlags() & SkColorFilter::kHasFilter16_Flag); |
| 84 | |
| 85 | fShader->shadeSpan16(x, y, result, count); |
| 86 | fFilter->filterSpan16(result, count, result); |
| 87 | } |
| 88 | |
| 89 | #ifdef SK_DEVELOPER |
| 90 | void SkFilterShader::toString(SkString* str) const { |
| 91 | str->append("SkFilterShader: ("); |
| 92 | |
| 93 | str->append("Shader: "); |
| 94 | fShader->toString(str); |
| 95 | str->append(" Filter: "); |
| 96 | // TODO: add "fFilter->toString(str);" once SkColorFilter::toString is added |
| 97 | |
| 98 | this->INHERITED::toString(str); |
| 99 | |
| 100 | str->append(")"); |
| 101 | } |
| 102 | #endif |