1.1 --- a/src/gfx.c	Wed Mar 07 06:11:51 2012 +0200
     1.2 +++ b/src/gfx.c	Thu Mar 08 14:37:17 2012 +0200
     1.3 @@ -1,5 +1,5 @@
     1.4  /*
     1.5 -Copyright 2004 John Tsiombikas <nuclear@siggraph.org>
     1.6 +Copyright 2004-2012 John Tsiombikas <nuclear@member.fsf.org>
     1.7  
     1.8  This file is part of gbasys, a library for GameBoy Advance development.
     1.9  
    1.10 @@ -21,6 +21,7 @@
    1.11  #include "config.h"
    1.12  
    1.13  #include <stdlib.h>
    1.14 +#include <string.h>
    1.15  #include "gfx.h"
    1.16  
    1.17  #define FRAME_SEL_BIT	0x10
    1.18 @@ -134,6 +135,42 @@
    1.19  	dma_copy32(3, dst->pixels, src->pixels, words);
    1.20  }
    1.21  
    1.22 +#define MIN(a, b)	((a) < (b) ? (a) : (b))
    1.23 +
    1.24 +void blit(struct pixel_buffer *src, int src_x, int src_y, int src_w, int src_h,
    1.25 +		struct pixel_buffer *dst, int dst_x, int dst_y)
    1.26 +{
    1.27 +	int i, pixsize, width, height, dstride, sstride;
    1.28 +	unsigned char *dptr, *sptr;
    1.29 +
    1.30 +	if(dst->bpp != src->bpp)
    1.31 +		return;
    1.32 +
    1.33 +	if(src_w <= 0)
    1.34 +		src_w = src->x;
    1.35 +	if(src_h <= 0)
    1.36 +		src_h = src->y;
    1.37 +
    1.38 +	width = MIN(src_w, MIN(src->x - src_x, dst->x - dst_x));
    1.39 +	height = MIN(src_h, MIN(src->y - src_y, dst->y - dst_y));
    1.40 +
    1.41 +	if(width <= 0 || height <= 0)
    1.42 +		return;
    1.43 +
    1.44 +	pixsize = dst->bpp / 8;
    1.45 +	dptr = (unsigned char*)dst->pixels + (dst_y * dst->x + dst_x) * pixsize;
    1.46 +	sptr = (unsigned char*)src->pixels + (src_y * src->x + src_x) * pixsize;
    1.47 +
    1.48 +	dstride = dst->x * pixsize;
    1.49 +	sstride = src->x * pixsize;
    1.50 +
    1.51 +	for(i=0; i<height; i++) {
    1.52 +		memcpy(dptr, sptr, width * pixsize);
    1.53 +		sptr += sstride;
    1.54 +		dptr += dstride;
    1.55 +	}
    1.56 +}
    1.57 +
    1.58  
    1.59  void draw_line(int x1, int y1, int x2, int y2, unsigned short col, struct pixel_buffer *pbuf) {
    1.60  	int dx, dy, dx2, dy2;