Adds an iOS implementation of gfx::Image.

ui/gfx/image/image_util_ios.mm

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <UIKit/UIKit.h>
+
+#include "ui/gfx/image/image.h"
+#include "ui/gfx/image/image_util.h"
+
+#include "base/logging.h"
+
+namespace gfx {
+
+Image* ImageFromPNGEncodedData(const unsigned char* input, size_t input_size) {

[Robert Sesek, 2012/09/13 16:14:24]

Wait, why this and gfx::internal::CreateUIImageFromPNG?

[rohitrao (ping after 24h), 2012/09/13 17:57:57]

Legacy code.  These util functions were written before ImagePNG existed, and
they're still used by chrome/ code.

I think in this situation, providing iOS implementations of cross-platform
functions is important, even if they are somewhat deprecated.  The correct
solution is to remove uses of these functions from chrome/ and then get rid of
them completely.

I've switched the PNG functions to just create and return ImagePNGs.  I can't
quite drop this file in favor of image_util.mm because we don't compile the JPEG
decoder on iOS yet, so the JPEG conversion still needs to go through UIImage
functions.

+  NSData* data = [NSData dataWithBytes:input length:input_size];
+  UIImage* image = [[UIImage alloc] initWithData:data];
+  if (!image)
+    return NULL;
+
+  return new Image(image);
+}
+
+
+bool PNGEncodedDataFromImage(const Image& image,

[Robert Sesek, 2012/09/13 16:14:24]

And why this and gfx::internal::PNGFromUIImage?

+                             std::vector<unsigned char>* dst) {
+  NSData* data = UIImagePNGRepresentation(image.ToUIImage());
+
+  if (!data || [data length] == 0)

[Robert Sesek, 2012/09/13 16:14:24]

nit: extra check, and on line 41

[rohitrao (ping after 24h), 2012/09/13 17:57:57]

Done.

+    return false;
+
+  dst->resize([data length]);
+  [data getBytes:(&dst->at(0)) length:[data length]];

[Robert Sesek, 2012/09/13 16:14:24]

nit: extra parens, and on line 45

[rohitrao (ping after 24h), 2012/09/13 17:57:57]

Done.

+  return true;
+}
+
+bool JPEGEncodedDataFromImage(const Image& image,
+                              int quality,
+                              std::vector<unsigned char>* dst) {
+  NSData* data = UIImageJPEGRepresentation(image.ToUIImage(), quality / 100.0);
+
+  if (!data || [data length] == 0)
+    return false;
+
+  dst->resize([data length]);
+  [data getBytes:(&dst->at(0)) length:[data length]];
+  return true;
+}
+
+}  // end namespace gfx