aura: A few changes to have aura_demo compile and run on linux.

ui/gfx/linux_util.cc

+// Copyright (c) 2011 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 "ui/gfx/linux_util.h"
+
+#include <pango/pango.h>
+#include <pango/pangocairo.h>
+#include <stdlib.h>
+
+#include "base/basictypes.h"
+#include "base/command_line.h"
+#include "base/linux_util.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "third_party/skia/include/core/SkUnPreMultiply.h"
+#include "ui/gfx/rect.h"
+
+namespace {
+
+// Common implementation of ConvertAcceleratorsFromWindowsStyle() and
+// RemoveWindowsStyleAccelerators().
+// Replaces all ampersands (as used in our grd files to indicate mnemonics)
+// to |target|. Similarly any underscores get replaced with two underscores as
+// is needed by GTK.
+std::string ConvertAmperstandsTo(const std::string& label,
+                                 const std::string& target) {
+  std::string ret;
+  ret.reserve(label.length() * 2);
+  for (size_t i = 0; i < label.length(); ++i) {
+    if ('_' == label[i]) {
+      ret.push_back('_');
+      ret.push_back('_');
+    } else if ('&' == label[i]) {
+      if (i + 1 < label.length() && '&' == label[i + 1]) {
+        ret.push_back('&');
+        ++i;
+      } else {
+        ret.append(target);
+      }
+    } else {
+      ret.push_back(label[i]);
+    }
+  }
+
+  return ret;
+}
+
+}  // namespace
+
+namespace gfx {
+
+#if defined(USE_WAYLAND) || defined(USE_AURA)
+PangoContext* GetPangoContext() {
+  PangoFontMap* font_map = pango_cairo_font_map_get_default();
+  return pango_font_map_create_context(font_map);
+}
+#endif
+
+double GetPangoResolution() {
+  static double resolution;
+  static bool determined_resolution = false;
+  if (!determined_resolution) {
+    determined_resolution = true;
+    PangoContext* default_context = GetPangoContext();
+    resolution = pango_cairo_context_get_resolution(default_context);
+    g_object_unref(default_context);
+  }
+  return resolution;
+}
+
+std::string ConvertAcceleratorsFromWindowsStyle(const std::string& label) {
+  return ConvertAmperstandsTo(label, "_");
+}
+
+std::string RemoveWindowsStyleAccelerators(const std::string& label) {
+  return ConvertAmperstandsTo(label, "");
+}
+
+uint8_t* BGRAToRGBA(const uint8_t* pixels, int width, int height, int stride) {
+  if (stride == 0)
+    stride = width * 4;
+
+  uint8_t* new_pixels = static_cast<uint8_t*>(malloc(height * stride));
+
+  // We have to copy the pixels and swap from BGRA to RGBA.
+  for (int i = 0; i < height; ++i) {
+    for (int j = 0; j < width; ++j) {
+      int idx = i * stride + j * 4;
+      new_pixels[idx] = pixels[idx + 2];
+      new_pixels[idx + 1] = pixels[idx + 1];
+      new_pixels[idx + 2] = pixels[idx];
+      new_pixels[idx + 3] = pixels[idx + 3];
+    }
+  }
+
+  return new_pixels;
+}
+
+}  // namespace gfx