move SK_MMAP_SUPPORT into SkPreConfig, so we can know about its availability

trunk/src/ports/SkFontHost_simple.cpp

Index: trunk/src/ports/SkFontHost_simple.cpp
===================================================================
--- trunk/src/ports/SkFontHost_simple.cpp	(revision 8197)
+++ trunk/src/ports/SkFontHost_simple.cpp	(working copy)
@@ -9,7 +9,6 @@
 
 #include "SkFontHost.h"
 #include "SkDescriptor.h"
-#include "SkMMapStream.h"
 #include "SkPaint.h"
 #include "SkString.h"
 #include "SkStream.h"
@@ -312,30 +311,18 @@
         fPath.set(path);
     }
 
-    // overrides
-    virtual SkStream* openStream() {
-        SkStream* stream = SkNEW_ARGS(SkMMAPStream, (fPath.c_str()));
-
-        // check for failure
-        if (stream->getLength() <= 0) {
-            SkDELETE(stream);
-            // maybe MMAP isn't supported. try FILE
-            stream = SkNEW_ARGS(SkFILEStream, (fPath.c_str()));
-            if (stream->getLength() <= 0) {
-                SkDELETE(stream);
-                stream = NULL;
-            }
-        }
-        return stream;
+    virtual SkStream* openStream() SK_OVERRIDE {
+        return SkStream::NewFromFile(fPath.c_str());
     }
-    virtual const char* getUniqueString() const {
+
+    virtual const char* getUniqueString() const SK_OVERRIDE {
         const char* str = strrchr(fPath.c_str(), '/');
         if (str) {
             str += 1;   // skip the '/'
         }
         return str;
     }
-    virtual const char* getFilePath() const {
+    virtual const char* getFilePath() const SK_OVERRIDE {
         return fPath.c_str();
     }
 
@@ -353,21 +340,15 @@
     SkString        fullpath;
     GetFullPathForSysFonts(&fullpath, path);
 
-    SkMMAPStream stream(fullpath.c_str());
-    if (stream.getLength() > 0) {
+    SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(path));
+    if (stream.get()) {
         return find_name_and_attributes(&stream, name, style, NULL);
-    }
-    else {
-        SkFILEStream stream(fullpath.c_str());
-        if (stream.getLength() > 0) {
-            return find_name_and_attributes(&stream, name, style, NULL);
+    } else {
+        if (isExpected) {
+            SkDebugf("---- failed to open <%s> as a font\n", fullpath.c_str());
         }
+        return false;
     }
-
-    if (isExpected) {
-        SkDebugf("---- failed to open <%s> as a font\n", fullpath.c_str());
-    }
-    return false;
 }
 
 // used to record our notion of the pre-existing fonts
@@ -636,9 +617,6 @@
 }
 
 SkTypeface* SkFontHost::CreateTypefaceFromFile(const char path[]) {
-    SkStream* stream = SkNEW_ARGS(SkMMAPStream, (path));
-    SkTypeface* face = SkFontHost::CreateTypefaceFromStream(stream);
-    // since we created the stream, we let go of our ref() here
-    stream->unref();
-    return face;
+    SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(path));
+    return stream.get() ? SkFontHost::CreateTypefaceFromStream(stream) : NULL;
 }