https://bugs.gentoo.org/763591

https://github.com/tux4kids/t4kcommon/commit/99e9d3895b480d5998513592f6af25096c6d1c50
From: Paul Huff <paul.huff@gmail.com>
Date: Wed, 1 May 2019 19:56:12 -0600
Subject: [PATCH] Use libxml2 to get info from svg files for frame counts since
 librsvg doesn't let you access the description anymore.
--- a/src/t4k_loaders.c
+++ b/src/t4k_loaders.c
@@ -41,4 +41,6 @@
 #include<librsvg/rsvg.h>
 #include<librsvg/rsvg-cairo.h>
+#include <libxml/parser.h>
+#include <libxml/tree.h>
 #endif
 
@@ -49,4 +51,5 @@
 
 #ifdef HAVE_RSVG
+int             get_number_of_frames_from_svg(const char *file_name);
 SDL_Surface*    load_svg(const char* file_name, int width, int height, const char* layer_name);
 sprite*         load_svg_sprite(const char* file_name, int width, int height);
@@ -161,4 +164,43 @@
 #ifdef HAVE_RSVG
 
+int get_number_of_frames_from_svg(const char* file_name) {
+    xmlDocPtr svgFile;
+    xmlNodePtr svgNode = NULL, nodeIterator = NULL;
+    int number_of_frames = 0, found = 0;
+
+    svgFile = xmlReadFile(file_name, NULL, XML_PARSE_RECOVER | XML_PARSE_NOERROR | XML_PARSE_NOWARNING);
+
+    /* If it's null something's really wrong because we're trying to load a sprite that doesn't exist */
+    if(svgFile == NULL) {
+        DEBUGMSG(debug_loaders, "get_number_of_frames_from_svg: couldn't load svgFile: %s\n", file_name);
+        return 0;
+    }
+
+    svgNode = xmlDocGetRootElement(svgFile);
+
+    /* If it's null then something's really wrong because there should be a root in every svg file... */
+    if(svgNode == NULL) {
+        DEBUGMSG(debug_loaders, "get_number_of_frames_from_svg: couldn't load the root from the svgFile: %s", file_name);
+        xmlFreeDoc(svgFile); /* be clean */
+        return 0;
+    }
+
+    nodeIterator = svgNode->children;
+    while(nodeIterator) {
+        if(xmlStrcasecmp(nodeIterator->name, (const xmlChar*)"desc") == 0) {
+            sscanf((const char*)xmlNodeGetContent(nodeIterator), "%d", &number_of_frames);
+            xmlFreeDoc(svgFile);
+            return number_of_frames;
+        }
+        nodeIterator = nodeIterator->next;
+    }
+
+    /* if we get here we had no description, which means something's really wrong */
+    DEBUGMSG(debug_loaders, "get_number_of_frames_from_svg: couldn't find the description frame number count from svgFile: %s", file_name);
+    xmlFreeDoc(svgFile);
+    return 0;
+}
+
+
 /* Load a layer of SVG file and resize it to given dimensions.
    If width or height is negative no resizing is applied.
@@ -215,5 +257,5 @@
 
   /* get number of frames from description */
-  sscanf(rsvg_handle_get_desc(file_handle), "%d", &new_sprite->num_frames);
+  new_sprite->num_frames = get_number_of_frames_from_svg(file_name);
   DEBUGMSG(debug_loaders, "load_svg_sprite(): loading %d frames\n", new_sprite->num_frames);