| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkFilterShader.h" |
| |
| #include "SkColorFilter.h" |
| #include "SkReadBuffer.h" |
| #include "SkWriteBuffer.h" |
| #include "SkShader.h" |
| #include "SkString.h" |
| |
| SkFilterShader::SkFilterShader(SkShader* shader, SkColorFilter* filter) { |
| fShader = shader; |
| shader->ref(); |
| |
| fFilter = filter; |
| filter->ref(); |
| } |
| |
| SkFilterShader::SkFilterShader(SkReadBuffer& buffer) |
| : INHERITED(buffer) { |
| fShader = buffer.readShader(); |
| fFilter = buffer.readColorFilter(); |
| } |
| |
| SkFilterShader::~SkFilterShader() { |
| fFilter->unref(); |
| fShader->unref(); |
| } |
| |
| void SkFilterShader::flatten(SkWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| buffer.writeFlattenable(fShader); |
| buffer.writeFlattenable(fFilter); |
| } |
| |
| uint32_t SkFilterShader::getFlags() { |
| uint32_t shaderF = fShader->getFlags(); |
| uint32_t filterF = fFilter->getFlags(); |
| |
| // if the filter doesn't support 16bit, clear the matching bit in the shader |
| if (!(filterF & SkColorFilter::kHasFilter16_Flag)) { |
| shaderF &= ~SkShader::kHasSpan16_Flag; |
| } |
| // if the filter might change alpha, clear the opaque flag in the shader |
| if (!(filterF & SkColorFilter::kAlphaUnchanged_Flag)) { |
| shaderF &= ~(SkShader::kOpaqueAlpha_Flag | SkShader::kHasSpan16_Flag); |
| } |
| return shaderF; |
| } |
| |
| bool SkFilterShader::setContext(const SkBitmap& device, |
| const SkPaint& paint, |
| const SkMatrix& matrix) { |
| // we need to keep the setContext/endContext calls balanced. If we return |
| // false, our endContext() will not be called. |
| |
| if (!this->INHERITED::setContext(device, paint, matrix)) { |
| return false; |
| } |
| if (!fShader->setContext(device, paint, matrix)) { |
| this->INHERITED::endContext(); |
| return false; |
| } |
| return true; |
| } |
| |
| void SkFilterShader::endContext() { |
| fShader->endContext(); |
| this->INHERITED::endContext(); |
| } |
| |
| void SkFilterShader::shadeSpan(int x, int y, SkPMColor result[], int count) { |
| fShader->shadeSpan(x, y, result, count); |
| fFilter->filterSpan(result, count, result); |
| } |
| |
| void SkFilterShader::shadeSpan16(int x, int y, uint16_t result[], int count) { |
| SkASSERT(fShader->getFlags() & SkShader::kHasSpan16_Flag); |
| SkASSERT(fFilter->getFlags() & SkColorFilter::kHasFilter16_Flag); |
| |
| fShader->shadeSpan16(x, y, result, count); |
| fFilter->filterSpan16(result, count, result); |
| } |
| |
| #ifdef SK_DEVELOPER |
| void SkFilterShader::toString(SkString* str) const { |
| str->append("SkFilterShader: ("); |
| |
| str->append("Shader: "); |
| fShader->toString(str); |
| str->append(" Filter: "); |
| // TODO: add "fFilter->toString(str);" once SkColorFilter::toString is added |
| |
| this->INHERITED::toString(str); |
| |
| str->append(")"); |
| } |
| #endif |