[PDF] Refactor SkPDFFont to enable font/cmap subsetting.

Patch from Arthur Hsu, original CL: http://codereview.appspot.com/4633050/

Review URL: http://codereview.appspot.com/4811049

git-svn-id: http://skia.googlecode.com/svn/trunk@1943 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 15 insertions, 4 deletions

diff --git a/include/pdf/SkPDFDevice.h b/include/pdf/SkPDFDevice.h
index 7a3e7bb7f1..1a0807aa67 100644
--- a/include/pdf/SkPDFDevice.h
+++ b/include/pdf/SkPDFDevice.h
@@ -30,6 +30,7 @@ class SkPDFDevice;
 class SkPDFDict;
 class SkPDFFont;
 class SkPDFFormXObject;
+class SkPDFGlyphSetMap;
 class SkPDFGraphicState;
 class SkPDFObject;
 class SkPDFShader;
@@ -150,11 +151,18 @@ public:
      *  for calling data->unref() when it is finished.
      */
     SK_API SkData* copyContentToData() const;
-    
+
     SK_API const SkMatrix& initialTransform() const {
         return fInitialTransform;
     }
 
+    /** Returns a SkPDFGlyphSetMap which represents glyph usage of every font
+     *  that shows on this device.
+     */
+    const SkPDFGlyphSetMap& getFontGlyphUsage() const {
+        return *(fFontGlyphUsage.get());
+    }
+
 private:
     // TODO(vandebo) push most of SkPDFDevice's state into a core object in
     // order to get the right access levels without using friend.
@@ -183,17 +191,20 @@ private:
     ContentEntry* getLastContentEntry();
     void setLastContentEntry(ContentEntry* contentEntry);
 
+    // Glyph ids used for each font on this device.
+    SkTScopedPtr<SkPDFGlyphSetMap> fFontGlyphUsage;
+
     SkPDFDevice(const SkISize& layerSize, const SkClipStack& existingClipStack,
                 const SkRegion& existingClipRegion);
 
     // override from SkDevice
-    virtual SkDevice* onCreateCompatibleDevice(SkBitmap::Config config, 
-                                               int width, int height, 
+    virtual SkDevice* onCreateCompatibleDevice(SkBitmap::Config config,
+                                               int width, int height,
                                                bool isOpaque,
                                                Usage usage);
 
     void init();
-    void cleanUp();
+    void cleanUp(bool clearFontUsage);
     void createFormXObjectFromDevice(SkRefPtr<SkPDFFormXObject>* xobject);
 
     // Clear the passed clip from all existing content entries.