Implemented transparent gradients

src/pdf/SkPDFFormXObject.cpp

 
 /*
  * 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"
@@ skipping 10 matching lines @@
     // 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);
 
     SkAutoTUnref<SkStream> content(device->content());
     setData(content.get());
 
-    insertName("Type", "XObject");
-    insertName("Subtype", "Form");
-    SkSafeUnref(this->insert("BBox", device->copyMediaBox()));
-    insert("Resources", resourceDict);
+    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.
             SkASSERT(false);
             inverse.reset();
         }
         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);
+
+    setData(content);
+
+    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() {
     fResources.unrefAll();
 }
 
 void SkPDFFormXObject::getResources(
         const SkTSet<SkPDFObject*>& knownResourceObjects,
         SkTSet<SkPDFObject*>* newResourceObjects) {
     GetResourcesHelper(&fResources.toArray(),
                        knownResourceObjects,
                        newResourceObjects);
 }