Update the SkDocument interface to allow for 1) abort won't emit pdf, 2) close can report success/f…

include/pdf/SkPDFCallbacks.h

+
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#ifndef SkPDFCallbacks_DEFINED
+#define SkPDFCallbacks_DEFINED
+
+class SkBitmap;
+class SkIRect;
+class SkWStream;
+
+/** EncodeToDCTStream sets the DCTEncoder for images, to encode a bitmap as JPEG (DCT).
+ *  Result of encodings are cached, if the encoder changes the
+ *  behaivor dynamically and an image is added to a second catalog,
+ *  we will likely use the result of the first encoding call.
+ *  By returning false from the encoder function, the encoder result is not used.
+ *  Callers might not want to encode small images, as the time spent
+ *  encoding and decoding might not be worth the space savings, if any at all.
+ */
+
+typedef bool (*EncodeToDCTStream)(SkWStream* stream, const SkBitmap& bitmap, const SkIRect& rect);

[scroggo, 2013/09/26 22:05:55]

Should these be inside a namespace?

+// TODO(edisonn): add here the ones about font, shadow render preferences,
+// how to export unsupported features, ...
+
+#endif   // SkPDFCallbacks_DEFINED