-(defun stretched-image (img)
- "Resize that file to 32x32 and convert it into a ppm."
- ;; HAAAAAAAAAAAACK
- (map '(vector (unsigned-byte 8)) #'char-code
- (resized (resize-bmp-blob img 32 32))))
+(defun bmp-to-gif (inblob)
+ "Convert BMP to Grayscale-Gif using skippy."
+ (let*
+ ((w (uxul-world::bmp-width inblob))
+ (h (uxul-world::bmp-height inblob))
+ (img (uxul-world::bmp-pixel-data inblob))
+ (color-table (skippy:make-color-table))
+ (colors
+ (let
+ ((v (make-array '(256) :adjustable nil)))
+ (dotimes (i 256)
+ (setf (elt v i)
+ (skippy:ensure-color (skippy:rgb-color i i i) color-table)))
+ v))
+ (grayscale (lambda (x)
+ ;; 0 becomes transparent
+ (cond
+ ((< (elt x 3) 128) 0)
+ (t (max 1
+ (round
+ (/ (+ (elt x 1) (elt x 2) (elt x 0)) 3)))))))
+ (image-data
+ (let ((id (skippy:make-image-data w h)))
+ (dotimes (i w)
+ (dotimes (j h)
+ (setf (elt id (+ i (* w (- h j 1))))
+ (elt colors
+ (funcall grayscale
+ (make-array '(4)
+ :element-type '(unsigned-byte 8)
+ :displaced-to img
+ :displaced-index-offset
+ (* 4 (+ i (* w j)))))))))
+ id))
+ (image (skippy:make-image :width w :height h
+ :image-data image-data
+ :transparency-index 0))
+ (data-stream (skippy:make-data-stream
+ :height h :width w
+ :color-table color-table)))
+ (skippy:add-image image data-stream)
+ (flexi-streams:with-output-to-sequence (out)
+ (skippy:write-data-stream data-stream out))))
+
+
+(defun stretched-image (imgs)
+ "Resize that image to 32x32 and convert it into a ppm."
+ (bmp-to-gif
+ (uxul-world::resize-bmp-blob (car imgs) 32 32)))