SkPDFFormXObject.cpp File Reference

#include "src/pdf/SkPDFFormXObject.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkStream.h"
#include "src/pdf/SkPDFUtils.h"
#include <utility>

Go to the source code of this file.

Functions
SkPDFIndirectReference	SkPDFMakeFormXObject (SkPDFDocument *doc, std::unique_ptr< SkStreamAsset > content, std::unique_ptr< SkPDFArray > mediaBox, std::unique_ptr< SkPDFDict > resourceDict, const SkMatrix &inverseTransform, const char *colorSpace)

Function Documentation

SkPDFMakeFormXObject()

SkPDFIndirectReference SkPDFMakeFormXObject	(	SkPDFDocument *	doc,
		std::unique_ptr< SkStreamAsset >	content,
		std::unique_ptr< SkPDFArray >	mediaBox,
		std::unique_ptr< SkPDFDict >	resourceDict,
		const SkMatrix &	inverseTransform,
		const char *	colorSpace
	)

A form XObject is a self contained description of a graphics object. A form XObject is a page object with slightly different syntax, that can be drawn into a page content stream, just like a bitmap XObject can be drawn into a page content stream.

Definition at line 16 of file SkPDFFormXObject.cpp.

                                                                    {
    std::unique_ptr<SkPDFDict> dict = SkPDFMakeDict();
    dict->insertName("Type", "XObject");
    dict->insertName("Subtype", "Form");
    if (!inverseTransform.isIdentity()) {
        dict->insertObject("Matrix", SkPDFUtils::MatrixToArray(inverseTransform));
    }
    dict->insertObject("Resources", std::move(resourceDict));
    dict->insertObject("BBox", std::move(mediaBox));
 
    // Right now FormXObject is only used for saveLayer, which implies
    // isolated blending.  Do this conditionally if that changes.
    // TODO(halcanary): Is this comment obsolete, since we use it for
    // alpha masks?
    auto group = SkPDFMakeDict("Group");
    group->insertName("S", "Transparency");
    if (colorSpace != nullptr) {
        group->insertName("CS", colorSpace);
    }
    group->insertBool("I", true);  // Isolated.
    dict->insertObject("Group", std::move(group));
    return SkPDFStreamOut(std::move(dict), std::move(content), doc);
}