Re: high-level text drawing

[Olexiy Avramchenko <olexiy irtech cn ua>]

Tom Liu wrote:

>Hi Olexiy:
>	Attatch is the program I make for the test. 
>	You may try it and will find what's wrong with this test
>program.
>	
>	I run this program on a sun box and the Xserver is Exceed7.1.1.
>  
>
You should not create/destroy layout and set layout's font in your test 
because you dont use XLoadFont or so...
I've done some testing (sample attached), my results: ~100 times with 
Xft backend and ~20 times with GDK_USE_XFT=0 (XFree86-4.3.0 NVIDIA 
driver NV17 chip, P4 1.8GHz portable).

PS: I was really surprised, my older measurements were much better ;)

    Olexiy
#include <stdio.h>
#include <string.h>
#include <gtk/gtk.h>
#include <gdk/gdkx.h>


static GtkWidget *label;
static GtkWidget *area;
static GtkWidget *spin;


static void run_test()
{
gint		i, count;
gchar		s[256];
gdouble		t0, t1;
GTimer		*timer;
PangoLayout	*pl;

	count = gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(spin));
	timer = g_timer_new();

	pl = gtk_widget_create_pango_layout(area, NULL);

	g_timer_start(timer);
	for (i=0;i<count;i++) {
		sprintf(s, "str%d", i);
		pango_layout_set_text(pl, s, -1);
		gdk_draw_layout(area->window, area->style->black_gc, 0,0, pl);
	}
	gdk_flush();
	g_timer_stop(timer);
	g_object_unref(pl);

	t0 = g_timer_elapsed(timer, NULL);

	g_timer_start(timer);
	for (i=0;i<count;i++) {
		sprintf(s, "str%d", i);
		XDrawString(GDK_DISPLAY(), GDK_DRAWABLE_XID(area->window), GDK_GC_XGC(area->style->black_gc), 0,0, s, strlen(s));
	}
	gdk_flush();
	g_timer_stop(timer);

	t1 = g_timer_elapsed(timer, NULL);

	sprintf(
		s,
		"gdk_draw_layout: %fms total, %fus per string\n"\
		"XDrawString: %fms total, %fus per string\n\n"\
		"gdk_draw_layout/XDrawString: %f\n",
		t0/1000.0, t0*1000.0*1000.0/count,
		t1/1000.0, t1*1000.0*1000.0/count,
		t0/t1
	);

	gtk_label_set_text(GTK_LABEL(label), s);

	g_timer_destroy(timer);
}

int main(int argc, char **argv)
{
GtkWidget *window;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *button;

	gtk_init(&argc, &argv);

	window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
	gtk_container_set_border_width(GTK_CONTAINER(window), 4);
	g_signal_connect(window, "delete-event", G_CALLBACK(gtk_main_quit), 0);

	vbox = gtk_vbox_new(FALSE, 4);
	gtk_container_add(GTK_CONTAINER(window), vbox);

	area = gtk_drawing_area_new();
	gtk_widget_set_size_request(area, 256,64);
	gtk_box_pack_start(GTK_BOX(vbox), area, FALSE,FALSE, 0);

	label = gtk_label_new("[ press execute to run test ]");
	gtk_box_pack_start(GTK_BOX(vbox), label, FALSE,FALSE, 0);

	hbox = gtk_hbox_new(FALSE, 4);
	gtk_box_pack_start(GTK_BOX(vbox), hbox, FALSE,FALSE, 0);

	gtk_box_pack_start(GTK_BOX(hbox), gtk_label_new("N tests:"), FALSE,FALSE, 0);

	spin = gtk_spin_button_new_with_range(1024,128*1024, 1024);
	gtk_box_pack_start(GTK_BOX(hbox), spin, FALSE,FALSE, 0);

	button = gtk_button_new_from_stock(GTK_STOCK_EXECUTE);
	gtk_box_pack_start(GTK_BOX(hbox), button, FALSE,FALSE, 0);
	g_signal_connect(button, "clicked", G_CALLBACK(run_test), 0);

	gtk_widget_show_all(window);
	gtk_main();

	return 0;
}