add SKIA_VERSION_[MAJOR, MINOR, PATCH] in header and SkGraphics API

git-svn-id: http://skia.googlecode.com/svn/trunk@542 2bbb7eff-a529-9590-31e7-b0007b416f81

include/core/SkGraphics.h

@@ -33,7 +33,12 @@ public:
         Returns true if some amount was purged from the font cache.
     */
     static bool SetFontCacheUsed(size_t usageInBytes);
-    
+
+    /** Return the version numbers for the library. If the parameter is not
+        null, it is set to the version number.
+     */
+    static void GetVersion(int32_t* major, int32_t* minor, int32_t* patch);
+
 private:
     /** This is automatically called by SkGraphics::Init(), and must be
         implemented by the host OS. This allows the host OS to register a callback

include/core/SkTypes.h

@@ -30,6 +30,12 @@
 /** \file SkTypes.h
 */
 
+/** See SkGraphics::GetVersion() to retrieve these at runtime
+ */
+#define SKIA_VERSION_MAJOR  1
+#define SKIA_VERSION_MINOR  0
+#define SKIA_VERSION_PATCH  0
+
 /*
     memory wrappers to be implemented by the porting layer (platform)
 */

src/core/SkGraphics.cpp

@@ -374,3 +374,15 @@ bool SkGraphics::SetFontCacheUsed(size_t usageInBytes) {
     return SkGlyphCache::SetCacheUsed(usageInBytes);
 }
 
+void SkGraphics::GetVersion(int32_t* major, int32_t* minor, int32_t* patch) {
+    if (major) {
+        *major = SKIA_VERSION_MAJOR;
+    }
+    if (minor) {
+        *minor = SKIA_VERSION_MINOR;
+    }
+    if (patch) {
+        *patch = SKIA_VERSION_PATCH;
+    }
+}
+