From 5a63b4c2710732f73caed6fa9fa08fcf1ca7fd44 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Sun, 17 Feb 2013 04:50:18 -0500
Subject: Support layers in maps.

---
(limited to 'src')

diff --git a/src/resources/map.c b/src/resources/map.c
index ea2144f..7eda415 100644
--- a/src/resources/map.c
+++ b/src/resources/map.c
@@ -6,6 +6,8 @@
 #include "map.h"
 #include "resource.h"
 #include "../xml.h"
+#include "../base64.h"
+#include "../compression.h"
 #include "../logging.h"
 
 struct resource_table ts_res;
@@ -20,6 +22,10 @@ static void XMLCALL tmx_tileset_end(void *, const char *);
 static void XMLCALL tmx_tilesetemb_end(void *, const char *);
 static void XMLCALL tmx_tileset_el_start(void *, const char *, const char **);
 static void XMLCALL tmx_image_end(void *, const char *);
+static void XMLCALL tmx_layer_el_start(void *, const char *, const char **);
+static void XMLCALL tmx_layer_end(void *, const char *);
+static void XMLCALL tmx_data_end(void *, const char *);
+static void XMLCALL tmx_data_cdata(void *, const char *, int);
 static void XMLCALL tmx_unused_start(void *, const char *, const char **);
 static void XMLCALL tmx_unused_end(void *, const char *);
 static void XMLCALL tmx_invalid_start(void *, const char *, const char **);
@@ -97,17 +103,6 @@ map_get(const char *path)
 }
 
 void
-map_add_layer(struct map *m, struct layer *l)
-{
-	if (m->layers_head == NULL) {
-		m->layers_head = l;
-	} else {
-		m->layers_tail->next = l;
-	}
-	m->layers_tail = l;
-}
-
-void
 map_add_tileset(struct map *m, struct tileset *t, int firstgid)
 {
 	struct map_tileset *mts;
@@ -129,6 +124,28 @@ map_add_tileset(struct map *m, struct tileset *t, int firstgid)
 	m->tilesets_tail = mts;
 }
 
+struct layer *
+map_get_layer(struct map *m, const char *name)
+{
+	if (strcmp(name, "ground") == 0) {
+		return &m->layers[LAYER_GROUND];
+	} else if (strcmp(name, "obj-low") == 0) {
+		return &m->layers[LAYER_OBJ_LOW];
+	} else if (strcmp(name, "char-bot") == 0) {
+		return &m->layers[LAYER_CHAR_BOT];
+	} else if (strcmp(name, "obj-mid") == 0) {
+		return &m->layers[LAYER_OBJ_MID];
+	} else if (strcmp(name, "char-top") == 0) {
+		return &m->layers[LAYER_CHAR_TOP];
+	} else if (strcmp(name, "obj-high") == 0) {
+		return &m->layers[LAYER_OBJ_HIGH];
+	} else if (strcmp(name, "weather") == 0) {
+		return &m->layers[LAYER_WEATHER];
+	} else {
+		return NULL;
+	}
+}
+
 static struct tileset *
 tileset_get(const char *path, const char *basedir)
 {
@@ -243,14 +260,17 @@ tmx_map_el_start(void *pv, const char *name, const char **attr)
 	char *source;
 	char *path;
 	struct tileset *ts;
+	char *ly_name;
+	struct layer *ly;
 
 	debug("<%s> (map child)", name);
 
+	m = xml_node_peek(p);
+
 	if (xml_check_tag(name, "properties")) {
 		/* Not used by engine. */
 		xml_node_push(p, NULL, tmx_unused_start, tmx_unused_end, NULL);
 	} else if (xml_check_tag(name, "tileset")) {
-		m = xml_node_peek(p);
 		dirname = m->dirname;
 		source = NULL;
 		xml_get_string_attr(p, attr, "source", &source, 0);
@@ -281,6 +301,13 @@ tmx_map_el_start(void *pv, const char *name, const char **attr)
 					tmx_tilesetemb_end, NULL);
 		}
 		xml_get_int_attr(p, attr, "firstgid", &m->cur_ts_firstgid, 1);
+	} else if (xml_check_tag(name, "layer")) {
+		ly_name = NULL;
+		xml_get_string_attr(p, attr, "name", &ly_name, 1);
+		ly = map_get_layer(m, ly_name);
+		free(ly_name);
+		ly->map = m;
+		xml_node_push(p, ly, tmx_layer_el_start, tmx_layer_end, NULL);
 	} else {
 		xml_unexpected_start_tag(p, name,
 				"properties, tileset, layer, or objectgroup");
@@ -293,7 +320,7 @@ tmx_tileset_start(void *pv, const char *name, const char **attr)
 	XML_Parser p = (XML_Parser) pv;
 	struct tileset *ts;
 
-	debug("<%s> (tileset)", name);
+	debug("<%s> (external tileset)", name);
 
 	if (xml_check_tag(name, "tileset")) {
 		ts = xml_node_peek(p);
@@ -350,7 +377,10 @@ tmx_tileset_el_start(void *pv, const char *name, const char **attr)
 
 	debug("<%s> (tileset child)", name);
 
-	if (xml_check_tag(name, "image")) {
+	if (xml_check_tag(name, "tileoffset")) {
+		/* Not used by engine. */
+		xml_node_push(p, NULL, tmx_unused_start, tmx_unused_end, NULL);
+	} else if (xml_check_tag(name, "image")) {
 		dirname = ((struct tileset *) xml_node_peek(p))->dirname;
 		xml_get_string_attr(p, attr, "source", &source, 0);
 		path = malloc(strlen(dirname) + strlen(source) + 2);
@@ -361,6 +391,11 @@ tmx_tileset_el_start(void *pv, const char *name, const char **attr)
 		img = img_png_get(path);
 		free(source);
 		xml_node_push(p, img, tmx_invalid_start, tmx_image_end, NULL);
+#if 0
+	} else if (xml_check_tag(name, "tile")) {
+		xml_node_push(p, img, tmx_tile_properties_start, tmx_tile_end,
+				NULL);
+#endif
 	} else {
 		xml_unexpected_start_tag(p, name, "image");
 	}
@@ -385,6 +420,142 @@ tmx_image_end(void *pv, const char *name)
 }
 
 static void XMLCALL
+tmx_layer_el_start(void *pv, const char *name, const char **attr)
+{
+	XML_Parser p = (XML_Parser) pv;
+	struct layer *ly;
+
+	debug("<%s> (layer child)", name);
+
+	ly = xml_node_peek(p);
+
+	if (xml_check_tag(name, "properties")) {
+		/* Not used by engine. */
+		xml_node_push(p, NULL, tmx_unused_start, tmx_unused_end, NULL);
+	} else if (xml_check_tag(name, "data")) {
+		/* NB: This parser requires an encoding.  The author is too lazy
+		 * to parse a bunch of <tile> elements. */
+		xml_get_string_attr(p, attr, "encoding", &ly->encoding, 1);
+		xml_get_string_attr(p, attr, "compression", &ly->compression,
+				0);
+		xml_node_push(p, ly, tmx_invalid_start, tmx_data_end,
+				tmx_data_cdata);
+	} else {
+		xml_unexpected_start_tag(p, name, "layer");
+	}
+}
+
+static void XMLCALL
+tmx_layer_end(void *pv, const char *name)
+{
+	XML_Parser p = (XML_Parser) pv;
+
+	debug("</%s> (layer)", name);
+
+	if (xml_check_tag(name, "layer")) {
+		xml_node_pop(p);
+	} else {
+		xml_unexpected_end_tag(p, name, "layer");
+	}
+}
+
+static void XMLCALL
+tmx_data_end(void *pv, const char *name)
+{
+	XML_Parser p = (XML_Parser) pv;
+	struct layer *ly;
+	size_t decoded_len;
+	size_t decomp_len;
+	char *decoded_buf;
+	char *decomp_buf;
+
+	debug("</%s> (data)", name);
+
+	ly = xml_node_peek(p);
+
+	if (xml_check_tag(name, "data")) {
+		decoded_len = strlen(ly->raw_data);
+		decomp_len = 4 * ly->map->width * ly->map->height;
+		debug("Expected map data size: %d", decomp_len);
+		decoded_buf = malloc(decoded_len + 1);
+		if (decoded_buf == NULL) {
+			warn("Failed to allocate layer data buffer");
+			return;
+		}
+		if (strcmp(ly->encoding, "base64") == 0) {
+			debug("Decoding base 64 layer data...");
+			base64_decode(ly->raw_data,
+					decoded_buf, decoded_len + 1);
+		}
+		if (ly->compression == NULL) {
+			debug("Layer data already decompressed");
+			decomp_buf = decoded_buf;
+		} else if (strcmp(ly->compression, "zlib") == 0) {
+			debug("Decompressing layer data with zlib...");
+			decomp_buf = malloc(decomp_len);
+			if (decomp_buf == NULL) {
+				warn("Failed to allocate layer data buffer");
+				return;
+			}
+			decompress(decoded_buf, decoded_len,
+					decomp_buf, decomp_len);
+			free(decoded_buf);
+		} else if (strcmp(ly->compression, "gzip") == 0) {
+			debug("Decompressing layer data with gzip...");
+			decomp_buf = malloc(decomp_len);
+			if (decomp_buf == NULL) {
+				warn("Failed to allocate layer data buffer");
+			}
+			decompress(decoded_buf, decoded_len,
+					decomp_buf, decomp_len);
+			free(decoded_buf);
+		} else {
+			/* This should never happen.  This branch exists only to
+			 * silence GCC's maybe-uninitialized warning on
+			 * decomp_buf below. */
+			return;
+		}
+		free(ly->raw_data);
+		ly->tiles = (Uint32 *) decomp_buf;
+		xml_node_pop(p);
+	} else {
+		xml_unexpected_end_tag(p, name, "data");
+	}
+}
+
+static void XMLCALL
+tmx_data_cdata(void *pv, const char *s, int len)
+{
+	XML_Parser p = (XML_Parser) pv;
+	struct layer *ly;
+	char *s_z;
+	char *s_z_trimmed, *s_z_trimmed_end;
+
+	debug("[CDATA]");
+
+	ly = xml_node_peek(p);
+
+	s_z = s_z_trimmed = strndup(s, len);
+
+	while(isspace(*s_z_trimmed)) {
+		++s_z_trimmed;
+		--len;
+	}
+	if (*s_z_trimmed == '\0') {
+		return;
+	}
+	s_z_trimmed_end = s_z_trimmed + len - 1;
+	while (s_z_trimmed_end > s_z_trimmed && isspace(*s_z_trimmed_end)) {
+		--s_z_trimmed_end;
+	}
+	*(s_z_trimmed_end + 1) = '\0';
+
+	ly->raw_data = strdup(s_z_trimmed);
+
+	free(s_z);
+}
+
+static void XMLCALL
 tmx_unused_start(void *pv, const char *name, const char **attr)
 {
 	XML_Parser p = (XML_Parser) pv;
@@ -403,7 +574,7 @@ tmx_unused_end(void *pv, const char *name)
 {
 	XML_Parser p = (XML_Parser) pv;
 
-	debug("<%s> (unused)", name);
+	debug("</%s> (unused)", name);
 
 	/* Shut up, GCC. */
 	for (; *name != '\0'; ++name);
diff --git a/src/resources/map.h b/src/resources/map.h
index 2926aa5..11ba808 100644
--- a/src/resources/map.h
+++ b/src/resources/map.h
@@ -4,8 +4,17 @@
 #include <SDL_stdinc.h>
 #include "resource.h"
 #include "image.h"
-#include "layer.h"
 
+enum layer_id {
+	LAYER_GROUND = 0,
+	LAYER_OBJ_LOW,
+	LAYER_CHAR_BOT,
+	LAYER_OBJ_MID,
+	LAYER_CHAR_TOP,
+	LAYER_OBJ_HIGH,
+	LAYER_WEATHER,
+	LAYERS_MAX
+};
 struct tileset {
 	struct resource res;
 	char *dirname;
@@ -19,6 +28,13 @@ struct map_tileset {
 	int firstgid;
 	struct map_tileset *next;
 };
+struct layer {
+	struct map *map;
+	Uint32 *tiles;
+	char *encoding;
+	char *compression;
+	char *raw_data;
+};
 struct map {
 	struct resource res;
 	char *dirname;
@@ -28,15 +44,14 @@ struct map {
 	int tileheight;
 	struct map_tileset *tilesets_head;
 	struct map_tileset *tilesets_tail;
-	struct layer *layers_head;
-	struct layer *layers_tail;
+	struct layer layers[LAYERS_MAX];
 	Uint8 *collision;
 	int cur_ts_firstgid;
 };
 
 struct map *map_get(const char *path);
 void map_free(struct map *map);
-void map_add_layer(struct map *m, struct layer *l);
 void map_add_tileset(struct map *m, struct tileset *t, int firstgid);
+struct layer *map_get_layer(struct map *m, const char *name);
 
 #endif
--
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