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* Copyright 2010 The Android Open Source Project
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#include "SkPDFFormXObject.h"
#include "SkMatrix.h"
#include "SkPDFCatalog.h"
#include "SkPDFDevice.h"
#include "SkPDFResourceDict.h"
#include "SkPDFUtils.h"
#include "SkStream.h"
#include "SkTypes.h"
SkPDFFormXObject::SkPDFFormXObject(SkPDFDevice* device) {
// We don't want to keep around device because we'd have two copies
// of content, so reference or copy everything we need (content and
// resources).
SkTSet<SkPDFObject*> emptySet;
SkPDFResourceDict* resourceDict = device->getResourceDict();
resourceDict->getReferencedResources(emptySet, &fResources, false);
SkAutoTDelete<SkStream> content(device->content());
SkAutoTUnref<SkPDFArray> bboxArray(device->copyMediaBox());
init(NULL, resourceDict, bboxArray);
// We invert the initial transform and apply that to the xobject so that
// it doesn't get applied twice. We can't just undo it because it's
// embedded in things like shaders and images.
if (!device->initialTransform().isIdentity()) {
SkMatrix inverse;
if (!device->initialTransform().invert(&inverse)) {
// The initial transform should be invertible.
insert("Matrix", SkPDFUtils::MatrixToArray(inverse))->unref();
* Creates a FormXObject from a content stream and associated resources.
SkPDFFormXObject::SkPDFFormXObject(SkStream* content, SkRect bbox,
SkPDFResourceDict* resourceDict) {
SkTSet<SkPDFObject*> emptySet;
resourceDict->getReferencedResources(emptySet, &fResources, false);
SkAutoTUnref<SkPDFArray> bboxArray(SkPDFUtils::RectToArray(bbox));
init("DeviceRGB", resourceDict, bboxArray);
* Common initialization code.
* Note that bbox is unreferenced here, so calling code does not need worry.
void SkPDFFormXObject::init(const char* colorSpace,
SkPDFDict* resourceDict, SkPDFArray* bbox) {
insertName("Type", "XObject");
insertName("Subtype", "Form");
insert("Resources", resourceDict);
insert("BBox", bbox);
// Right now SkPDFFormXObject is only used for saveLayer, which implies
// isolated blending. Do this conditionally if that changes.
SkAutoTUnref<SkPDFDict> group(new SkPDFDict("Group"));
group->insertName("S", "Transparency");
if (colorSpace != NULL) {
group->insertName("CS", colorSpace);
group->insert("I", new SkPDFBool(true))->unref(); // Isolated.
insert("Group", group.get());
SkPDFFormXObject::~SkPDFFormXObject() {
void SkPDFFormXObject::getResources(
const SkTSet<SkPDFObject*>& knownResourceObjects,
SkTSet<SkPDFObject*>* newResourceObjects) {