Introduce Emacs_Pix_Container and Emacs_Pix_Context typedefs
Emacs_Pix_Container is a pointer to a struct representing pixmap data on the backend. Emacs_Pix_Context is the context for the bitmap/pixmap on the backend. Only w32 currently makes this distinction; they are otherwise the same type. * src/dispextern.h: Remove XImagePtr in favor of using XImage* directly. Rename XImagePtr_or_DC to Emacs_Pix_Context. [HAVE_X_WINDOWS] Alias Emacs_Pix_Container and Emacs_Pix_Context to XImage*. [HAVE_NS] Alias Emacs_Pix_Container and Emacs_Pix_Context to trivial Emacs_Pixmap definition. [HAVE_NTGUI]: Alias Emacs_Pix_Container to XImage* and Emacs_Pix_Context to HDC. * src/dispextern.h: * src/image.c: Use Emacs_Pix_Container over XImagePtr and Emacs_Pix_Context over XImagePtr_or_DC.
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