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

trunk/src/ports/SkFontHost_linux.cpp

Index: trunk/src/ports/SkFontHost_linux.cpp
===================================================================
--- trunk/src/ports/SkFontHost_linux.cpp	(revision 8197)
+++ trunk/src/ports/SkFontHost_linux.cpp	(working copy)
@@ -10,7 +10,6 @@
 #include "SkFontHost.h"
 #include "SkFontDescriptor.h"
 #include "SkDescriptor.h"
-#include "SkMMapStream.h"
 #include "SkOSFile.h"
 #include "SkPaint.h"
 #include "SkString.h"
@@ -280,8 +279,8 @@
     EmptyTypeface() : INHERITED(SkTypeface::kNormal, true, NULL, false) {}
 
     // overrides
-    virtual SkStream* openStream() { return NULL; }
-    virtual const char* getUniqueString() const { return NULL; }
+    virtual SkStream* openStream() SK_OVERRIDE { return NULL; }
+    virtual const char* getUniqueString() SK_OVERRIDE const { return NULL; }
 
 private:
     typedef FamilyTypeface INHERITED;
@@ -299,14 +298,12 @@
         fStream->unref();
     }
 
-    // overrides
-    virtual SkStream* openStream()
-    {
+    virtual SkStream* openStream() SK_OVERRIDE {
       // openStream returns a refed stream.
       fStream->ref();
       return fStream;
     }
-    virtual const char* getUniqueString() const { return NULL; }
+    virtual const char* getUniqueString() const SK_OVERRIDE { return NULL; }
 
 private:
     SkStream* fStream;
@@ -322,25 +319,11 @@
         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 '/'
@@ -359,19 +342,13 @@
 
 static bool get_name_and_style(const char path[], SkString* name,
                                SkTypeface::Style* style, bool* isFixedWidth) {
-    SkMMAPStream stream(path);
-    if (stream.getLength() > 0) {
-        return find_name_and_attributes(&stream, name, style, isFixedWidth);
+    SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(path));
+    if (stream.get()) {
+        return find_name_and_attributes(stream, name, style, isFixedWidth);
+    } else {
+        SkDebugf("---- failed to open <%s> as a font\n", path);
+        return false;
     }
-    else {
-        SkFILEStream stream(path);
-        if (stream.getLength() > 0) {
-            return find_name_and_attributes(&stream, name, style, isFixedWidth);
-        }
-    }
-
-    SkDebugf("---- failed to open <%s> as a font\n", path);
-    return false;
 }
 
 // these globals are assigned (once) by load_system_fonts()