Fixed cross compilation with mingw.

src/ports/SkOSFile_win.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkOSFile.h"
 
 #include "SkTFitsIn.h"
@@ skipping 32 matching lines @@
 }
 
 bool sk_fidentical(SkFILE* a, SkFILE* b) {
     SkFILEID aID, bID;
     return sk_ino(a, &aID) && sk_ino(b, &bID)
            && aID.fLsbSize == bID.fLsbSize
            && aID.fMsbSize == bID.fMsbSize
            && aID.fVolume == bID.fVolume;
 }
 
-template <typename HandleType, HandleType InvalidValue, BOOL (WINAPI * Close)(HandleType)>
+template <typename HandleType, LONG_PTR InvalidValue, BOOL (WINAPI * Close)(HandleType)>

[bungeman-skia, 2014/03/14 14:50:37]

Ick, ack, uck. So technically... in the C++ specification 14.3.2 it appears that
it used to be the case that pointer template arguments had to be addresses of
real objects. C++11 extended this to include NULL. The rationale for this is
that some systems don't have flat pointers into which random stuff like -1 can
be stuffed (in fact it seemed like there was some debate about NULL for this
reason as well). VC++ lets this slide, but it is against the spec to have a

template <void* P> struct A { };
typedef A<-1> a;  //  -1 doesn't isn't the address of an object.

I'll have to think about this a bit.

 class SkAutoTHandle : SkNoncopyable {
 public:
     SkAutoTHandle(HandleType handle) : fHandle(handle) { }
     ~SkAutoTHandle() { Close(fHandle); }
     operator HandleType() { return fHandle; }
-    bool isValid() { return InvalidValue != fHandle; }
+    bool isValid() { return HandleType(InvalidValue) != fHandle; }
 private:
     HandleType fHandle;
 };
-typedef SkAutoTHandle<HANDLE, INVALID_HANDLE_VALUE, CloseHandle> SkAutoWinFile;
-typedef SkAutoTHandle<HANDLE, NULL, CloseHandle> SkAutoWinMMap;
+typedef SkAutoTHandle<HANDLE, -1 /* INVALID_HANDLE_VALUE */, CloseHandle> SkAutoWinFile;
+typedef SkAutoTHandle<HANDLE, 0 /* NULL */, CloseHandle> SkAutoWinMMap;
 
 void sk_fmunmap(const void* addr, size_t) {
     UnmapViewOfFile(addr);
 }
 
 void* sk_fdmmap(int fileno, size_t* length) {
     HANDLE file = (HANDLE)_get_osfhandle(fileno);
     if (INVALID_HANDLE_VALUE == file) {
         return NULL;
     }
@@ skipping 29 matching lines @@
 }
 
 void* sk_fmmap(SkFILE* f, size_t* length) {
     int fileno = sk_fileno(f);
     if (fileno < 0) {
         return NULL;
     }
 
     return sk_fdmmap(fileno, length);
 }