fixed errors in gif loading

config.ini

@@ -1,9 +1,9 @@
-tile_width	= 16
-tile_height	= 16
-map_width 	= 240
-map_height	= 238
+tile_width	= 8
+tile_height	= 8
+map_width 	= 100
+map_height	= 100
 screen_width 	= 320
-screen_height	= 224
+screen_height	= 240
 zoom		= 3
-tiles		= tiles.png
+tiles		= test.gif
 map		= map.map

gif.c

@@ -381,6 +381,8 @@ static int process_extension( unsigned char* buffer )
  */
 
 unsigned char* LoadPalette(unsigned char *buffer) {
+    bbb = buffer;
+
 	unsigned char header[7];
 	screen_descriptor_t screen_descriptor;
 	int color_resolution_bits;

main.cpp

@@ -165,6 +165,13 @@ void UpdateMiniMap() {
 	free(pixels);
 }
 
+const bool IsGIF(const char* filename) {
+	const int filename_size = strlen(filename);
+	if ((filename[filename_size-3]=='g') && (filename[filename_size-2]=='i') && (filename[filename_size-1]=='f') ||
+		(filename[filename_size-3]=='G') && (filename[filename_size-2]=='I') && (filename[filename_size-1]=='F')) return true;
+	return false;
+}
+
 void Init() {
 	LoadConfig();
 
@@ -188,10 +195,40 @@ void Init() {
 	int c;
 	FILE* f = fopen(GetPath(tiles_filename), "rb");
 	if (!f) { error = 2; return; }
-	buffer = stbi_load_from_file(f, &tilemap_width, &tilemap_height, &c, 4);
-	sdlTilesTexture = SDL_CreateTexture(sdlRenderer, SDL_PIXELFORMAT_ABGR8888, SDL_TEXTUREACCESS_STATIC, tilemap_width, tilemap_height);
-	SDL_UpdateTexture(sdlTilesTexture, NULL, buffer, tilemap_width * sizeof(Uint32));
-	SDL_SetTextureBlendMode(sdlTilesTexture, SDL_BLENDMODE_BLEND);
+
+	if (IsGIF(tiles_filename)) {
+		fseek(f, 0, SEEK_END);
+		const long fsize = ftell(f);
+		fseek(f, 0, SEEK_SET);  /* same as rewind(f); */
+		char *string = (char*)malloc(fsize + 1);
+		fread(string, 1, fsize, f);
+		string[fsize] = 0;
+		unsigned short w, h;
+		buffer = LoadGif((unsigned char*)string, &w, &h);
+		tilemap_width = w; tilemap_height = h;
+		Uint8* palette = LoadPalette((unsigned char*)string);
+		Uint32 pal[256];
+		for (int i=0;i<256;++i) {
+			pal[i] = 0xFF000000 + (palette[(i*3)]) + (palette[(i*3)+1] << 8) + (palette[(i*3)+2] << 16);
+		}
+		free(palette);
+		free(string);
+		if (buffer == NULL) { error = 2; return; }
+		sdlTilesTexture = SDL_CreateTexture(sdlRenderer, SDL_PIXELFORMAT_ABGR8888, SDL_TEXTUREACCESS_STATIC, tilemap_width, tilemap_height);
+		Uint32* pixels = (Uint32*)malloc(w*h*sizeof(Uint32));
+		for (int i = 0; i < w*h; i++) { pixels[i] = pal[buffer[i]]; }
+		SDL_UpdateTexture(sdlTilesTexture, NULL, pixels, w * sizeof(Uint32));
+		SDL_SetTextureBlendMode(sdlTilesTexture, SDL_BLENDMODE_BLEND);
+		free(buffer);
+		buffer = (Uint8*)malloc(w*h*sizeof(Uint32));
+		memcpy(buffer, pixels, w*h*sizeof(Uint32));
+		free(pixels);
+	} else {
+		buffer = stbi_load_from_file(f, &tilemap_width, &tilemap_height, &c, 4);
+		sdlTilesTexture = SDL_CreateTexture(sdlRenderer, SDL_PIXELFORMAT_ABGR8888, SDL_TEXTUREACCESS_STATIC, tilemap_width, tilemap_height);
+		SDL_UpdateTexture(sdlTilesTexture, NULL, buffer, tilemap_width * sizeof(Uint32));
+		SDL_SetTextureBlendMode(sdlTilesTexture, SDL_BLENDMODE_BLEND);
+	}
 	fclose(f);
 
 	const int tmtw = (tilemap_width / tile_width);
@@ -216,7 +253,11 @@ void Init() {
 			minitiles[tmx + tmy*tmtw] = 0xFF000000 + b + (g << 8) + (r << 16);
 		}
 	}
-	stbi_image_free(buffer);
+	if (IsGIF(tiles_filename)) {
+		free(buffer);
+	} else {
+		stbi_image_free(buffer);
+	}
 
 	f = fopen(GetPath(map_filename), "rb");
 	map = (unsigned char*)calloc(map_width*map_height*2, 1);