cstring and csprite are working

source/tart.c

@@ -26,6 +26,13 @@ struct tart_window tart_create_window() {
     return window;
 }
 
+tart_byte tart_restore_window(struct tart_window* window) {
+    for (int i = 0; i < window->data_count; i++) {
+        window->data[i] = '\0';
+    }
+    return TART_OK;
+}
+
 struct tart_buffer tart_create_buffer(tart_id id, struct tart_vec2 size, struct tart_vec2 position) {
     unsigned int cell_count = size.x * size.y;
 
@@ -37,6 +44,7 @@ struct tart_buffer tart_create_buffer(tart_id id, struct tart_vec2 size, struct
 
     unsigned int data_count = (size.x*size.y) * TART_CELL_DATA_SIZE;
     struct tart_buffer buf = {cell_count,0,id,size,position,cells}; // -NOTE- dose not set the layer
+    buf.cell_count = cell_count;
     return buf;
 }
 #ifdef TART_RGB_COLORS
@@ -174,7 +182,7 @@ tart_byte tart_csprite_free(struct tart_csprite* sprite) {
 }
 
 tart_byte tart_draw_cell_position(struct tart_buffer * buffer, struct tart_cell cell, struct tart_vec2 position) {
-    if(buffer->size.x >= position.x && buffer->size.y >= position.y) {
+    if(buffer->size.x > position.x && buffer->size.y > position.y) {
         buffer->cells[(buffer->size.x * position.y) + position.x] = cell;
     }
     return TART_OK;
@@ -198,5 +206,8 @@ tart_byte tart_draw_csprite_position(struct tart_buffer * buffer, struct tart_cs
 }
 
 tart_byte tart_restore_buffer(struct tart_buffer *buffer) {
+    for (int i = 0; i < buffer->cell_count; i++) {
+        buffer->cells[i] = NULL_CELL;
+    }
     return TART_OK;
 }