;; SDL (Simple Media Layer) library using CFFI for foreign function interfacing...
;; (C)2006 Luke Crook <luke@balooga.com>
;; This file contains some useful functions for using Zach Beane's VECTO with lispbuilder-SDL
;; http://www.xach.com/lisp/vecto/
(in-package #:lispbuilder-sdl)
(defun vecto->surface (src-image dst-surface x y &key (pixel-alpha t) (alpha 255))
(check-type dst-surface sdl-surface)
(unless (and (<= (vecto::width src-image)
(width dst-surface))
(<= (vecto::height src-image)
(height dst-surface)))
(error "VECTO->SURFACE: SRC-IMAGE larger than dst-surface"))
(sdl:with-surface (temp-surf (sdl:create-surface (vecto::width src-image)
(vecto::height src-image)
:pixel-alpha pixel-alpha
:alpha alpha))
(let ((fp-to-surf (fp temp-surf)))
(sdl-base::with-pixel (px fp-to-surf)
(let ((image-data (vecto::image-data src-image)))
(let ((ix 0) (iy 0)
(w (vecto::width src-image)))
(do ((h 0 (+ h 4))
(i 1 (+ i 4))
(j 2 (+ j 4))
(k 3 (+ k 4)))
((<= (length image-data) k))
(sdl-base::write-pixel px ix iy (sdl-base::map-color fp-to-surf
(aref image-data h)
(aref image-data i)
(aref image-data j)
(aref image-data k)))
(incf ix)
(when (>= ix w)
(setf ix 0
iy (1+ iy))))))))
(sdl:draw-surface-at-* temp-surf x y :surface dst-surface))
dst-surface)
(defun surface->vecto (src-surface dst-image)
(declare (ignore src-surface dst-image)))
