text widget has a constant buffer and owns the string to draw now

(passing a const char * from a local stack context is not really a
good idea!)
added more efficiet draw method for characters in vga driver
protected desktop for now against too often redraws (boolean global
variable needs_redraw, this is later a soffisticated set-of-areas-to
-redraw algorithm)

1 files changed, 3 insertions, 1 deletions

diff --git a/src/gui/text_widget.h b/src/gui/text_widget.h
index 4b00b4f..7e87a3c 100644
--- a/src/gui/text_widget.h
+++ b/src/gui/text_widget.h
@@ -3,6 +3,8 @@
 
 #include "widget.h"
 
+#define TEXT_WIDGET_MAX_TEXT_SIZE 100
+
 typedef struct {
 	widget_vtable_t base;
 	void (*set_text)( void *obj, const char *s );
@@ -11,7 +13,7 @@ typedef struct {
 typedef struct {
 	widget_t base;
 	text_widget_vtable_t *vtable;
-	const char *s;
+	char s[TEXT_WIDGET_MAX_TEXT_SIZE];
 } text_widget_t;
 
 void text_widget_init( text_widget_t *widget, widget_t *parent, const int x, const int y, const int w, const int h, const vga_color_t background_color, const char *s );