Home | History | Annotate | Download | only in pdf 
      1 
      2 /*
      3  * Copyright 2010 The Android Open Source Project
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 
      9 
     10 #include "SkPDFFormXObject.h"
     11 
     12 #include "SkMatrix.h"
     13 #include "SkPDFCatalog.h"
     14 #include "SkPDFDevice.h"
     15 #include "SkPDFResourceDict.h"
     16 #include "SkPDFUtils.h"
     17 #include "SkStream.h"
     18 #include "SkTypes.h"
     19 
     20 SkPDFFormXObject::SkPDFFormXObject(SkPDFDevice* device) {
     21     // We don't want to keep around device because we'd have two copies
     22     // of content, so reference or copy everything we need (content and
     23     // resources).
     24     SkTSet<SkPDFObject*> emptySet;
     25     SkPDFResourceDict* resourceDict = device->getResourceDict();
     26     resourceDict->getReferencedResources(emptySet, &fResources, false);
     27 
     28     SkAutoTUnref<SkStream> content(device->content());
     29     setData(content.get());
     30 
     31     SkAutoTUnref<SkPDFArray> bboxArray(device->copyMediaBox());
     32     init(NULL, resourceDict, bboxArray);
     33 
     34     // We invert the initial transform and apply that to the xobject so that
     35     // it doesn't get applied twice. We can't just undo it because it's
     36     // embedded in things like shaders and images.
     37     if (!device->initialTransform().isIdentity()) {
     38         SkMatrix inverse;
     39         if (!device->initialTransform().invert(&inverse)) {
     40             // The initial transform should be invertible.
     41             SkASSERT(false);
     42             inverse.reset();
     43         }
     44         insert("Matrix", SkPDFUtils::MatrixToArray(inverse))->unref();
     45     }
     46 }
     47 
     48 /**
     49  * Creates a FormXObject from a content stream and associated resources.
     50  */
     51 SkPDFFormXObject::SkPDFFormXObject(SkStream* content, SkRect bbox,
     52                                    SkPDFResourceDict* resourceDict) {
     53     SkTSet<SkPDFObject*> emptySet;
     54     resourceDict->getReferencedResources(emptySet, &fResources, false);
     55 
     56     setData(content);
     57 
     58     SkAutoTUnref<SkPDFArray> bboxArray(SkPDFUtils::RectToArray(bbox));
     59     init("DeviceRGB", resourceDict, bboxArray);
     60 }
     61 
     62 /**
     63  * Common initialization code.
     64  * Note that bbox is unreferenced here, so calling code does not need worry.
     65  */
     66 void SkPDFFormXObject::init(const char* colorSpace,
     67                             SkPDFDict* resourceDict, SkPDFArray* bbox) {
     68     insertName("Type", "XObject");
     69     insertName("Subtype", "Form");
     70     insert("Resources", resourceDict);
     71     insert("BBox", bbox);
     72 
     73     // Right now SkPDFFormXObject is only used for saveLayer, which implies
     74     // isolated blending.  Do this conditionally if that changes.
     75     SkAutoTUnref<SkPDFDict> group(new SkPDFDict("Group"));
     76     group->insertName("S", "Transparency");
     77 
     78     if (colorSpace != NULL) {
     79         group->insertName("CS", colorSpace);
     80     }
     81     group->insert("I", new SkPDFBool(true))->unref();  // Isolated.
     82     insert("Group", group.get());
     83 }
     84 
     85 SkPDFFormXObject::~SkPDFFormXObject() {
     86     fResources.unrefAll();
     87 }
     88 
     89 void SkPDFFormXObject::getResources(
     90         const SkTSet<SkPDFObject*>& knownResourceObjects,
     91         SkTSet<SkPDFObject*>* newResourceObjects) {
     92     GetResourcesHelper(&fResources.toArray(),
     93                        knownResourceObjects,
     94                        newResourceObjects);
     95 }
     96