This fixes a number of things that are warnings in the Mac compiler....

core/cross/texture.cc

 /*
  * Copyright 2009, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 78 matching lines @@
                                               levels())));
 }
 
 void Texture2D::DrawImage(Bitmap* src_img,
                           int src_x, int src_y,
                           int src_width, int src_height,
                           int dst_x, int dst_y,
                           int dst_width, int dst_height, int dest_mip) {
   DCHECK(src_img->image_data());
 
-  int mip_width = std::max(1, width() >> dest_mip);
-  int mip_height = std::max(1, height() >> dest_mip);
+  unsigned int mip_width = std::max(1, width() >> dest_mip);
+  unsigned int mip_height = std::max(1, height() >> dest_mip);
 
   // Clip source and destination rectangles to
   // source and destination bitmaps.
   // if src or dest rectangle is out of boundary,
   // do nothing and return.
   if (!Bitmap::AdjustDrawImageBoundary(&src_x, &src_y,
                                        &src_width, &src_height,
                                        src_img->width(), src_img->height(),
                                        &dst_x, &dst_y,
                                        &dst_width, &dst_height,
                                        mip_width, mip_height))
     return;
 
   unsigned int components = 0;
   // check formats of source and dest images.
   // format of source and dest should be the same.
   if (src_img->format() != format()) {
     O3D_ERROR(service_locator()) << "DrawImage does not support "
                                  << "different formats.";
     return;
   }
   // if src and dest are in the same size and drawImage is copying
   // the entire bitmap on dest image, just perform memcpy.
   if (src_x == 0 && src_y == 0 && dst_x == 0 && dst_y == 0 &&
       src_img->width() == mip_width && src_img->height() == mip_height &&
-      src_width == src_img->width() && src_height == src_img->height() &&
-      dst_width == mip_width && dst_height == mip_height) {
+      static_cast<unsigned int>(src_width) == src_img->width() && 
+      static_cast<unsigned int>(src_height) == src_img->height() &&
+      static_cast<unsigned int>(dst_width) == mip_width &&
+      static_cast<unsigned int>(dst_height) == mip_height) {
     void* data = NULL;
     if (!Lock(dest_mip, &data))
       return;
 
     uint8* mip_data = static_cast<uint8*>(data);
     unsigned int size = Bitmap::GetMipChainSize(mip_width, mip_height,
                                                 format(), 1);
     memcpy(mip_data, src_img->image_data(), size);
     this->Unlock(dest_mip);
 
@@ skipping 103 matching lines @@
 }
 
 void TextureCUBE::DrawImage(Bitmap* src_img,
                             int src_x, int src_y,
                             int src_width, int src_height,
                             int dst_x, int dst_y,
                             int dst_width, int dst_height,
                             CubeFace dest_face, int dest_mip) {
   DCHECK(src_img->image_data());
 
-  int mip_length = std::max(1, edge_length() >> dest_mip);
+  unsigned int mip_length = std::max(1, edge_length() >> dest_mip);
 
   // Clip source and destination rectangles to
   // source and destination bitmaps.
   // if src or dest rectangle is out of boundary,
   // do nothing and return true.
   if (!Bitmap::AdjustDrawImageBoundary(&src_x, &src_y,
                                        &src_width, &src_height,
                                        src_img->width(), src_img->height(),
                                        &dst_x, &dst_y,
                                        &dst_width, &dst_height,
                                        mip_length, mip_length))
     return;
 
   unsigned int components = 0;
   // check formats of source and dest images.
   // format of source and dest should be the same.
   if (src_img->format() != format()) {
     O3D_ERROR(service_locator()) << "DrawImage does not support "
                                  << "different formats.";
     return;
   }
   // if src and dest are in the same size and drawImage is copying
   // the entire bitmap on dest image, just perform memcpy.
   if (src_x == 0 && src_y == 0 && dst_x == 0 && dst_y == 0 &&
       src_img->width() == mip_length && src_img->height() == mip_length &&
-      src_width == src_img->width() && src_height == src_img->height() &&
-      dst_width == mip_length && dst_height == mip_length) {
+      static_cast<unsigned int>(src_width) == src_img->width() &&
+      static_cast<unsigned int>(src_height) == src_img->height() &&
+      static_cast<unsigned int>(dst_width) == mip_length &&
+      static_cast<unsigned int>(dst_height) == mip_length) {
     // get mip data by lock method.
     void* data = NULL;
     if (!Lock(dest_face, dest_mip, &data))
       return;
 
     uint8* mip_data = static_cast<uint8*>(data);
     unsigned int size = Bitmap::GetMipChainSize(mip_length, mip_length,
                                                 format(), 1);
     memcpy(mip_data, src_img->image_data(), size);
     this->Unlock(dest_face, dest_mip);
@@ skipping 23 matching lines @@
                                    src_width, src_height,
                                    src_img->width(), src_img->height(),
                                    mip_data, dst_x, dst_y,
                                    dst_width, dst_height,
                                    mip_length, mip_length, components);
 
   this->Unlock(dest_face, dest_mip);
 }
 
 }  // namespace o3d