| /* |
| * 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::FilterShaderContext::getFlags() const { |
| const SkFilterShader& filterShader = static_cast<const SkFilterShader&>(fShader); |
| |
| uint32_t shaderF = fShaderContext->getFlags(); |
| uint32_t filterF = filterShader.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; |
| } |
| |
| SkShader::Context* SkFilterShader::createContext(const SkBitmap& device, |
| const SkPaint& paint, |
| const SkMatrix& matrix, |
| void* storage) const { |
| if (!this->validContext(device, paint, matrix)) { |
| return NULL; |
| } |
| |
| char* shaderContextStorage = (char*)storage + sizeof(FilterShaderContext); |
| SkShader::Context* shaderContext = fShader->createContext(device, paint, matrix, |
| shaderContextStorage); |
| SkASSERT(shaderContext); |
| |
| return SkNEW_PLACEMENT_ARGS(storage, FilterShaderContext, |
| (*this, shaderContext, device, paint, matrix)); |
| } |
| |
| size_t SkFilterShader::contextSize() const { |
| return sizeof(FilterShaderContext) + fShader->contextSize(); |
| } |
| |
| bool SkFilterShader::validContext(const SkBitmap& device, |
| const SkPaint& paint, |
| const SkMatrix& matrix, |
| SkMatrix* totalInverse) const { |
| return this->INHERITED::validContext(device, paint, matrix, totalInverse) && |
| fShader->validContext(device, paint, matrix); |
| } |
| |
| SkFilterShader::FilterShaderContext::FilterShaderContext(const SkFilterShader& filterShader, |
| SkShader::Context* shaderContext, |
| const SkBitmap& device, |
| const SkPaint& paint, |
| const SkMatrix& matrix) |
| : INHERITED(filterShader, device, paint, matrix) |
| , fShaderContext(shaderContext) {} |
| |
| SkFilterShader::FilterShaderContext::~FilterShaderContext() { |
| fShaderContext->~Context(); |
| } |
| |
| void SkFilterShader::FilterShaderContext::shadeSpan(int x, int y, SkPMColor result[], int count) { |
| const SkFilterShader& filterShader = static_cast<const SkFilterShader&>(fShader); |
| |
| fShaderContext->shadeSpan(x, y, result, count); |
| filterShader.fFilter->filterSpan(result, count, result); |
| } |
| |
| void SkFilterShader::FilterShaderContext::shadeSpan16(int x, int y, uint16_t result[], int count) { |
| const SkFilterShader& filterShader = static_cast<const SkFilterShader&>(fShader); |
| |
| SkASSERT(fShaderContext->getFlags() & SkShader::kHasSpan16_Flag); |
| SkASSERT(filterShader.fFilter->getFlags() & SkColorFilter::kHasFilter16_Flag); |
| |
| fShaderContext->shadeSpan16(x, y, result, count); |
| filterShader.fFilter->filterSpan16(result, count, result); |
| } |
| |
| #ifndef SK_IGNORE_TO_STRING |
| 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 |