gif

commit 52677c1a0e6a91a995c9387fe7d0ea75544200af
parent c9dfbfd24f852142ef3298cff9d8598e336fd36f
Author: phoebos <ben@bvnf.space>
Date:   Wed,  1 Sep 2021 23:24:15 +0100

move colortable scanning to a separate function

Diffstat:
M
gif.c
 | 
24
++++++++++++++++++------

1 file changed, 18 insertions(+), 6 deletions(-)
diff --git a/gif.c b/gif.c
@@ -51,6 +51,16 @@ struct Image {
 };
 
 void
+scan_colortable(struct Color_table *ct, unsigned char *buf) {
+    /* TODO: gif87a.txt L 336? */
+    int i;
+    for (i = 0; i < ct->len; i += 1) {
+        rgb c = {*buf++, *buf++, *buf++};
+        memcpy(ct->table[i], c, sizeof(rgb));
+    }
+}
+
+void
 print_colortable(struct Color_table *c) {
     for (int i = 0; i < c->len; i++) {
         printf("%d: \033[48;2;%d;%d;%dm(%02x;%02x;%02x)\033[0m\n", i,
@@ -94,7 +104,12 @@ gif_decode_image(struct Image *img, struct Color_table *gct,
 
     if (img->flags && 0x80) {
         /* local color table follows */
-        fprintf(stderr, "using LCT(%d), ", img->flags && 7);
+        fprintf(stderr, "using LCT(%d)\n", img->flags && 7);
+        scan_colortable(img->lct, buf);
+        buf += 3 * img->lct->len;
+        print_colortable(img->lct);
+
+        ct = img->lct;
     } else {
         /* use GCT */
         fprintf(stderr, "using GCT, ");
@@ -157,11 +172,8 @@ gif_decode(unsigned char *buf, size_t len) {
 
     /* if GCT... */
     if (g.flags & 0x80) {
-        /* TODO: gif87a.txt L 336? */
-        for (int i = 0; i < g.gct->len; i += 1) {
-            rgb c = {*buf++, *buf++, *buf++};
-            memcpy(g.gct->table[i], c, sizeof(rgb));
-        }
+        scan_colortable(g.gct, buf);
+        buf += 3 * g.gct->len;
     }
 
     print_colortable(g.gct);