Fix possible memory leak in wxICOHandler loading code.

Use wxScopedArray<> instead of a raw pointer to ensure that the memory is
always freed, even in case of error return.

See #15918.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76128 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Allow loading icons of width 256 from ICO files.

Account for the tweak of ICO file format which uses 0 if the width is 256.

See #15918.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76129 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Handle verbosity correctly in wxICOHandler loading code.

Pass on the "verbose" argument to LoadDib() function instead of always being
verbose in it.

Also remove the unused IsBmp variable.

See #15918.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76130 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add support for loading icons in PNG format to wxImage.

ICO files can contain data in PNG, as well as BMP, format in recent (i.e. from
this millennium) versions of Windows, so check for this case in wxICOHandler
and load such data using wxPNGHandler.

See #15918.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76131 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add support for saving 256*256 ICOs in PNG format.

Allow saving icons larger than 127*127 pixels (up to 256*256 which is the
maximal size supported by the ICO format) and save large icons with the item
data in PNG format, as it is normally done for these sizes.

See #15918.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76132 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Allow saving 24 bpp ICO file in wxImage.

Create ICO files with 24bpp if the image being saved contains more than 256
colours.

Also use smaller values (4 bpp or monochrome) if the image uses fewer colours.

See #15918.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76133 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add support for saving 32bpp icons too.

Save in 32bpp format if alpha channel is present in the image being saved in
ICO format.

See #15918.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76134 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
No changes, just use properly const variable in wxBMPHandler code.

Initialize "data" pointer consistently with "alpha".

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76135 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Use wxScopedXXX<> instead of explicit memory management in wxBMPHandler.

Make the code simpler and ensure there are no memory leaks in it.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76136 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775