Re: Image scaling for Platform RegisterImage and RegisterRGBAImage?

Mitchell:

Is there any appetite for modifying the Platform RegisterImage and 
RegisterRGBAImage interfaces to add a scaling parameter? 
...
It might be possible to make scale=1 an optional default parameter, but I 
don’t know enough about C++ to know if that’ll still require downstream 
Platform changes or not.


It is not possible to add a parameter without modifying each downstream 
platform layer implementation. A defaulted parameter doesn't help this case 
- it helps the opposite case where user (or platform layer) code calls into 
platform-independent code.

Using the scale set with SCI_RGBAIMAGESETSCALE for SCI_REGISTERRGBAIMAGE 
could potentially cause problems for applications which set a scale for 
SCI_MARKERDEFINERGBAIMAGE but don't currently reset it before calling 
SCI_REGISTERRGBAIMAGE.

It may be possible to specify a scale factor by adding a scale field to the 
ListOptions struct as that will be ignored by current platform layers. 
However, ListOptions is a set of options to the whole ListBox, not to a 
specific image so would only be OK if all the images were scaled by the 
same factor.

Another approach is to subvert the types used with ScintillaQt::WndProc or 
similar handling Message::RegisterRGBAImage by dynamic casting the ac.lb 
(autocomplete listbox) from interface ListBox to concrete ListBoxImpl then 
calling a private RegisterRGBAImageScaled method. 

Neil

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