2 * Copyright 2013 Google Inc.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
8 #include "SkFilterShader.h"
10 #include "SkColorFilter.h"
11 #include "SkReadBuffer.h"
12 #include "SkWriteBuffer.h"
16 SkFilterShader::SkFilterShader(SkShader* shader, SkColorFilter* filter) {
24 #ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
25 SkFilterShader::SkFilterShader(SkReadBuffer& buffer) : INHERITED(buffer) {
26 fShader = buffer.readShader();
27 fFilter = buffer.readColorFilter();
31 SkFilterShader::~SkFilterShader() {
36 SkFlattenable* SkFilterShader::CreateProc(SkReadBuffer& buffer) {
37 SkAutoTUnref<SkShader> shader(buffer.readShader());
38 SkAutoTUnref<SkColorFilter> filter(buffer.readColorFilter());
39 if (!shader.get() || !filter.get()) {
42 return SkNEW_ARGS(SkFilterShader, (shader, filter));
45 void SkFilterShader::flatten(SkWriteBuffer& buffer) const {
46 buffer.writeFlattenable(fShader);
47 buffer.writeFlattenable(fFilter);
50 uint32_t SkFilterShader::FilterShaderContext::getFlags() const {
51 const SkFilterShader& filterShader = static_cast<const SkFilterShader&>(fShader);
53 uint32_t shaderF = fShaderContext->getFlags();
54 uint32_t filterF = filterShader.fFilter->getFlags();
56 // if the filter doesn't support 16bit, clear the matching bit in the shader
57 if (!(filterF & SkColorFilter::kHasFilter16_Flag)) {
58 shaderF &= ~SkShader::kHasSpan16_Flag;
60 // if the filter might change alpha, clear the opaque flag in the shader
61 if (!(filterF & SkColorFilter::kAlphaUnchanged_Flag)) {
62 shaderF &= ~(SkShader::kOpaqueAlpha_Flag | SkShader::kHasSpan16_Flag);
67 SkShader::Context* SkFilterShader::onCreateContext(const ContextRec& rec, void* storage) const {
68 char* shaderContextStorage = (char*)storage + sizeof(FilterShaderContext);
69 SkShader::Context* shaderContext = fShader->createContext(rec, shaderContextStorage);
70 if (NULL == shaderContext) {
73 return SkNEW_PLACEMENT_ARGS(storage, FilterShaderContext, (*this, shaderContext, rec));
76 size_t SkFilterShader::contextSize() const {
77 return sizeof(FilterShaderContext) + fShader->contextSize();
80 SkFilterShader::FilterShaderContext::FilterShaderContext(const SkFilterShader& filterShader,
81 SkShader::Context* shaderContext,
82 const ContextRec& rec)
83 : INHERITED(filterShader, rec)
84 , fShaderContext(shaderContext) {}
86 SkFilterShader::FilterShaderContext::~FilterShaderContext() {
87 fShaderContext->~Context();
90 void SkFilterShader::FilterShaderContext::shadeSpan(int x, int y, SkPMColor result[], int count) {
91 const SkFilterShader& filterShader = static_cast<const SkFilterShader&>(fShader);
93 fShaderContext->shadeSpan(x, y, result, count);
94 filterShader.fFilter->filterSpan(result, count, result);
97 void SkFilterShader::FilterShaderContext::shadeSpan16(int x, int y, uint16_t result[], int count) {
98 const SkFilterShader& filterShader = static_cast<const SkFilterShader&>(fShader);
100 SkASSERT(fShaderContext->getFlags() & SkShader::kHasSpan16_Flag);
101 SkASSERT(filterShader.fFilter->getFlags() & SkColorFilter::kHasFilter16_Flag);
103 fShaderContext->shadeSpan16(x, y, result, count);
104 filterShader.fFilter->filterSpan16(result, count, result);
107 #ifndef SK_IGNORE_TO_STRING
108 void SkFilterShader::toString(SkString* str) const {
109 str->append("SkFilterShader: (");
111 str->append("Shader: ");
112 fShader->toString(str);
113 str->append(" Filter: ");
114 // TODO: add "fFilter->toString(str);" once SkColorFilter::toString is added
116 this->INHERITED::toString(str);