DM: read image files without an extra copy

src/core/SkStream.cpp

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkStream.h"
@@ skipping 415 matching lines @@
 /////////////////////////////////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////////////////////////////////
 
 SkFILEWStream::SkFILEWStream(const char path[])
 {
     fFILE = sk_fopen(path, kWrite_SkFILE_Flag);
 }
 
 SkFILEWStream::~SkFILEWStream()
 {
-    if (fFILE)
+    if (fFILE) {
         sk_fclose(fFILE);
+    }
+}
+
+size_t SkFILEWStream::bytesWritten() const {
+    return sk_ftell(fFILE);
 }
 
 bool SkFILEWStream::write(const void* buffer, size_t size)
 {
-    if (fFILE == NULL)
+    if (fFILE == NULL) {
         return false;
+    }
 
     if (sk_fwrite(buffer, size, fFILE) != size)
     {
         SkDEBUGCODE(SkDebugf("SkFILEWStream failed writing %d bytes\n", size);)
         sk_fclose(fFILE);
         fFILE = NULL;
         return false;
     }
     return true;
 }
 
 void SkFILEWStream::flush()
 {
-    if (fFILE)
+    if (fFILE) {
         sk_fflush(fFILE);
+    }
 }
 
 ////////////////////////////////////////////////////////////////////////
 
 SkMemoryWStream::SkMemoryWStream(void* buffer, size_t size)
     : fBuffer((char*)buffer), fMaxLength(size), fBytesWritten(0)
 {
 }
 
 bool SkMemoryWStream::write(const void* buffer, size_t size)
@@ skipping 360 matching lines @@
 
     // If we get here, then our attempt at using mmap failed, so try normal
     // file access.
     SkFILEStream* stream = SkNEW_ARGS(SkFILEStream, (path));
     if (!stream->isValid()) {
         stream->unref();
         stream = NULL;
     }
     return stream;
 }