// static
SkPDFObject* SkPDFShader::GetPDFShader(const SkShader& shader,
const SkMatrix& matrix,
const SkIRect& surfaceBBox) {
SkPDFObject* result;
SkAutoMutexAcquire lock(CanonicalShadersMutex());
SkAutoTDelete<State> shaderState(new State(shader, matrix, surfaceBBox));
ShaderCanonicalEntry entry(NULL, shaderState.get());
int index = CanonicalShaders().find(entry);
if (index >= 0) {
result = CanonicalShaders()[index].fPDFShader;
result->ref();
return result;
}
// The PDFShader takes ownership of the shaderSate.
if (shaderState.get()->fType == SkShader::kNone_GradientType) {
result = new SkPDFImageShader(shaderState.detach());
} else {
SkPDFFunctionShader* functionShader =
new SkPDFFunctionShader(shaderState.detach());
if (!functionShader->isValid()) {
delete functionShader;
return NULL;
}
result = functionShader;
}
entry.fPDFShader = result;
CanonicalShaders().push(entry);
return result; // return the reference that came from new.
}
// static
SkPDFObject* SkPDFShader::GetPDFShaderByState(State* inState) {
SkPDFObject* result;
SkAutoTDelete<State> shaderState(inState);
if (shaderState.get()->fType == SkShader::kNone_GradientType &&
shaderState.get()->fImage.isNull()) {
// TODO(vandebo) This drops SKComposeShader on the floor. We could
// handle compose shader by pulling things up to a layer, drawing with
// the first shader, applying the xfer mode and drawing again with the
// second shader, then applying the layer to the original drawing.
return NULL;
}
ShaderCanonicalEntry entry(NULL, shaderState.get());
int index = CanonicalShaders().find(entry);
if (index >= 0) {
result = CanonicalShaders()[index].fPDFShader;
result->ref();
return result;
}
bool valid = false;
// The PDFShader takes ownership of the shaderSate.
if (shaderState.get()->fType == SkShader::kNone_GradientType) {
SkPDFImageShader* imageShader =
new SkPDFImageShader(shaderState.detach());
valid = imageShader->isValid();
result = imageShader;
} else {
if (shaderState.get()->GradientHasAlpha()) {
SkPDFAlphaFunctionShader* gradientShader =
SkNEW_ARGS(SkPDFAlphaFunctionShader, (shaderState.detach()));
valid = gradientShader->isValid();
result = gradientShader;
} else {
SkPDFFunctionShader* functionShader =
SkNEW_ARGS(SkPDFFunctionShader, (shaderState.detach()));
valid = functionShader->isValid();
result = functionShader;
}
}
if (!valid) {
delete result;
return NULL;
}
entry.fPDFShader = result;
CanonicalShaders().push(entry);
return result; // return the reference that came from new.
}