static SkPDFIndirectReference create_smask_graphic_state(SkPDFDocument* doc,
const SkPDFGradientShader::Key& state) {
SkASSERT(state.fType != SkShader::kNone_GradientType);
SkPDFGradientShader::Key luminosityState = clone_key(state);
for (int i = 0; i < luminosityState.fInfo.fColorCount; i++) {
SkAlpha alpha = SkColorGetA(luminosityState.fInfo.fColors[i]);
luminosityState.fInfo.fColors[i] = SkColorSetARGB(255, alpha, alpha, alpha);
}
luminosityState.fHash = hash(luminosityState);
SkASSERT(!gradient_has_alpha(luminosityState));
SkPDFIndirectReference luminosityShader = find_pdf_shader(doc, std::move(luminosityState), false);
std::unique_ptr<SkPDFDict> resources = get_gradient_resource_dict(luminosityShader,
SkPDFIndirectReference());
SkRect bbox = SkRect::Make(state.fBBox);
SkPDFIndirectReference alphaMask =
SkPDFMakeFormXObject(doc,
create_pattern_fill_content(-1, luminosityShader.fValue, bbox),
SkPDFUtils::RectToArray(bbox),
std::move(resources),
SkMatrix::I(),
"DeviceRGB");
return SkPDFGraphicState::GetSMaskGraphicState(
alphaMask, false, SkPDFGraphicState::kLuminosity_SMaskMode, doc);
}
static SkPDFIndirectReference make_alpha_function_shader(SkPDFDocument* doc,
const SkPDFGradientShader::Key& state) {
SkASSERT(state.fType != SkShader::kNone_GradientType);
SkPDFGradientShader::Key opaqueState = clone_key(state);
for (int i = 0; i < opaqueState.fInfo.fColorCount; i++) {
opaqueState.fInfo.fColors[i] = SkColorSetA(opaqueState.fInfo.fColors[i], SK_AlphaOPAQUE);
}
opaqueState.fHash = hash(opaqueState);
SkASSERT(!gradient_has_alpha(opaqueState));
SkRect bbox = SkRect::Make(state.fBBox);
SkPDFIndirectReference colorShader = find_pdf_shader(doc, std::move(opaqueState), false);
if (!colorShader) {
return SkPDFIndirectReference();
}
// Create resource dict with alpha graphics state as G0 and
// pattern shader as P0, then write content stream.
SkPDFIndirectReference alphaGsRef = create_smask_graphic_state(doc, state);
std::unique_ptr<SkPDFDict> resourceDict = get_gradient_resource_dict(colorShader, alphaGsRef);
std::unique_ptr<SkStreamAsset> colorStream =
create_pattern_fill_content(alphaGsRef.fValue, colorShader.fValue, bbox);
std::unique_ptr<SkPDFDict> alphaFunctionShader = SkPDFMakeDict();
SkPDFUtils::PopulateTilingPatternDict(alphaFunctionShader.get(), bbox,
std::move(resourceDict), SkMatrix::I());
return SkPDFStreamOut(std::move(alphaFunctionShader), std::move(colorStream), doc);
}
Hash *h_clone(Hash *self, h_clone_ft clone_key, h_clone_ft clone_value)
{
void *key, *value;
HashEntry *he;
int i = self->size;
Hash *ht_clone;
ht_clone = h_new(self->hash_i,
self->eq_i,
self->free_key_i,
self->free_value_i);
for (he = self->table; i > 0; he++) {
if (he->key && he->key != dummy_key) { /* active entry */
key = clone_key ? clone_key(he->key) : he->key;
value = clone_value ? clone_value(he->value) : he->value;
h_set(ht_clone, key, value);
i--;
}
}
return ht_clone;
}
