[PDF] Move most of the headers to be private.

Compute font stats in SkPDFDocument in order to make more of the headers private.

Previous review: https://codereview.appspot.com/5868049/

Review URL: https://codereview.appspot.com/5875049

git-svn-id: http://skia.googlecode.com/svn/trunk@3470 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 101 insertions, 0 deletions

diff --git a/src/pdf/SkPDFGraphicState.h b/src/pdf/SkPDFGraphicState.h
new file mode 100644
index 0000000000..af01737276
--- /dev/null
+++ b/src/pdf/SkPDFGraphicState.h
@@ -0,0 +1,101 @@
+
+/*
+ * 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.
+ */
+
+
+#ifndef SkPDFGraphicState_DEFINED
+#define SkPDFGraphicState_DEFINED
+
+#include "SkPaint.h"
+#include "SkPDFTypes.h"
+#include "SkTemplates.h"
+#include "SkThread.h"
+
+class SkPDFFormXObject;
+
+/** \class SkPDFGraphicState
+    SkPaint objects roughly correspond to graphic state dictionaries that can
+    be installed. So that a given dictionary is only output to the pdf file
+    once, we want to canonicalize them. Static methods in this class manage
+    a weakly referenced set of SkPDFGraphicState objects: when the last
+    reference to a SkPDFGraphicState is removed, it removes itself from the
+    static set of objects.
+
+*/
+class SkPDFGraphicState : public SkPDFDict {
+public:
+    virtual ~SkPDFGraphicState();
+
+    virtual void getResources(SkTDArray<SkPDFObject*>* resourceList);
+
+    // Override emitObject and getOutputSize so that we can populate
+    // the dictionary on demand.
+    virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog,
+                            bool indirect);
+    virtual size_t getOutputSize(SkPDFCatalog* catalog, bool indirect);
+
+    /** Get the graphic state for the passed SkPaint. The reference count of
+     *  the object is incremented and it is the caller's responsibility to
+     *  unreference it when done. This is needed to accommodate the weak
+     *  reference pattern used when the returned object is new and has no
+     *  other references.
+     *  @param paint  The SkPaint to emulate.
+     */
+    static SkPDFGraphicState* GetGraphicStateForPaint(const SkPaint& paint);
+
+    /** Make a graphic state that only sets the passed soft mask. The
+     *  reference count of the object is incremented and it is the caller's
+     *  responsibility to unreference it when done.
+     *  @param sMask  The form xobject to use as a soft mask.
+     *  @param invert Indicates if the alpha of the sMask should be inverted.
+     */
+    static SkPDFGraphicState* GetSMaskGraphicState(SkPDFFormXObject* sMask,
+                                                   bool invert);
+
+    /** Get a graphic state that only unsets the soft mask. The reference
+     *  count of the object is incremented and it is the caller's responsibility
+     *  to unreference it when done. This is needed to accommodate the weak
+     *  reference pattern used when the returned object is new and has no
+     *  other references.
+     */
+    static SkPDFGraphicState* GetNoSMaskGraphicState();
+
+private:
+    const SkPaint fPaint;
+    SkTDArray<SkPDFObject*> fResources;
+    bool fPopulated;
+    bool fSMask;
+
+    class GSCanonicalEntry {
+    public:
+        SkPDFGraphicState* fGraphicState;
+        const SkPaint* fPaint;
+
+        bool operator==(const GSCanonicalEntry& b) const;
+        explicit GSCanonicalEntry(SkPDFGraphicState* gs)
+            : fGraphicState(gs),
+              fPaint(&gs->fPaint) {}
+        explicit GSCanonicalEntry(const SkPaint* paint)
+            : fGraphicState(NULL),
+              fPaint(paint) {}
+    };
+
+    // This should be made a hash table if performance is a problem.
+    static SkTDArray<GSCanonicalEntry>& CanonicalPaints();
+    static SkBaseMutex& CanonicalPaintsMutex();
+
+    SkPDFGraphicState();
+    explicit SkPDFGraphicState(const SkPaint& paint);
+
+    void populateDict();
+
+    static SkPDFObject* GetInvertFunction();
+
+    static int Find(const SkPaint& paint);
+};
+
+#endif