HACKING xpm.el (et al)                                     -*- org -*-

This file is both a guide for newcomers and a todo list for oldstayers.

* ideas / wishlist
*** lacunae (sigh)
(defun xpm-as-rectangle ()
  (xpm--w/gg (w h cpp origin y-mult) (xpm--gate)
    (extract-rectangle
     origin
     (+ origin (* y-mult (1- h)) (* w cpp)))))

(defun xpm-from-rectangle (rect)
  (xpm--w/gg (w h cpp origin y-mult) (xpm--gate)
    (assert (= h (length rect)))
    (assert (= (* w cpp) (length (car rect))))
    (goto-char origin)
    (delete-rectangle origin (+ origin (* y-mult (1- h)) (* w cpp)))
    (insert-rectangle rect)))

(defun xpm-replace-from (buffer)
  (xpm-from-rectangle
   (with-current-buffer buffer
     (xpm-as-rectangle))))
*** add xpm-mode for interactive use -- [[file:xpm-ui.el][xpm-ui.el]]
***** hide/show header lines
***** palette
******* hide/show
******* display each PX in associated color (loses for ‘s’-only)
******* display as table (conserve vertical space)
******* add state "current px", commands to set it
***** hide/show sides
*** composition facilities -- [[file:xpm-compose.el][xpm-compose.el]]
***** multilevel congruence
******* dimensions only
******* palette not None
******* palette subset
******* full palette
***** destructive (2-op) vs non-destructive (3-op)
***** customizable pixel-compose fn
*** misc functionality
***** validate palette-data correspondance
***** import from rectangle
******* as-is (dangerous)
******* w/ char-to-px quantization
*** perf
***** ??? use ‘binary’ coding system
***** make ‘xpm-raster’ do [vh]-line expansion
* etc
#+odd


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