X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=tools%2Fpngdump%2Fimage.c;h=f276e63778c56fbdb106f014b923d04788472064;hb=HEAD;hp=0ae86f96592463064f3d9607df228ae72b73a859;hpb=ca3123df6cd875b1361533020c1f4eebfe9da295;p=gba_blender

diff --git a/tools/pngdump/image.c b/tools/pngdump/image.c
index 0ae86f9..f276e63 100644
--- a/tools/pngdump/image.c
+++ b/tools/pngdump/image.c
@@ -235,3 +235,78 @@ void blit(struct image *src, int sx, int sy, int w, int h, struct image *dst, in
 		sptr += src->pitch;
 	}
 }
+
+static unsigned int get_pixel(struct image *img, int x, int y)
+{
+	unsigned char *pptr;
+	unsigned short *pptr16;
+
+	switch(img->bpp) {
+	case 4:
+		pptr = img->pixels + y * img->pitch + x / 2;
+		return x & 1 ? *pptr & 0xf : *pptr >> 4;
+	case 8:
+		pptr = img->pixels + y * img->pitch + x;
+		return *pptr;
+	case 16:
+		pptr16 = (unsigned short*)(img->pixels + y * img->pitch + x * 2);
+		return *pptr16;
+	default:
+		fprintf(stderr, "get_pixel not implemented for %d bpp\n", img->bpp);
+	}
+
+	return 0;
+}
+
+static void put_pixel(struct image *img, int x, int y, unsigned int pix)
+{
+	unsigned char *pptr;
+	unsigned short *pptr16;
+
+	switch(img->bpp) {
+	case 4:
+		pptr = img->pixels + y * img->pitch + x / 2;
+		if(x & 1) {
+			*pptr = (*pptr & 0xf0) | pix;
+		} else {
+			*pptr = (*pptr & 0xf) | (pix << 4);
+		}
+		break;
+
+	case 8:
+		pptr = img->pixels + y * img->pitch + x;
+		*pptr = pix;
+		break;
+
+	case 16:
+		pptr16 = (unsigned short*)(img->pixels + y * img->pitch + x * 2);
+		*pptr16 = pix;
+		break;
+
+	default:
+		fprintf(stderr, "put_pixel not implemented for %d bpp\n", img->bpp);
+	}
+}
+
+void overlay_key(struct image *src, unsigned int key, struct image *dst)
+{
+	int i, j;
+	unsigned char *sptr, *dptr;
+	unsigned int pix;
+
+	assert(src->bpp == dst->bpp);
+	assert(src->width == dst->width);
+	assert(src->height == dst->height);
+
+	sptr = src->pixels;
+	dptr = dst->pixels;
+
+	for(i=0; i<dst->height; i++) {
+		for(j=0; j<dst->width; j++) {
+			pix = get_pixel(src, j, i);
+			if(pix != key) {
+				put_pixel(dst, j, i, pix);
+			}
+		}
+	}
+}