gecko-dev/other-licenses/libart_lgpl/test_gradient.c

377 строки
8.3 KiB
C

/* test_gradient.c */
#include <math.h>
#include <gtk/gtk.h>
#include "art_point.h"
#include "art_misc.h"
#include "art_affine.h"
#include "art_svp.h"
#include "art_svp_vpath.h"
#include "art_rgb.h"
#include "art_rgb_svp.h"
#include "art_render.h"
#include "art_render_gradient.h"
GtkWidget *drawing_area;
static art_u8 *rgbdata = NULL;
int width, height;
double pos_x[2], pos_y[2];
int pos_nr = 0;
double a = 1/32.0;
double b = -1/33.00000;
double c = -1/3.0;
ArtGradientSpread spread = ART_GRADIENT_REPEAT;
ArtVpath *
randstar (int n)
{
ArtVpath *vec;
int i;
double r, th;
vec = art_new (ArtVpath, n + 2);
for (i = 0; i < n; i++)
{
vec[i].code = i ? ART_LINETO : ART_MOVETO;
r = rand () * (250.0 / RAND_MAX);
th = i * 2 * M_PI / n;
vec[i].x = 250 + r * cos (th);
vec[i].y = 250 - r * sin (th);
}
vec[i].code = ART_LINETO;
vec[i].x = vec[0].x;
vec[i].y = vec[0].y;
i++;
vec[i].code = ART_END;
vec[i].x = 0;
vec[i].y = 0;
return vec;
}
ArtVpath *
rect (void)
{
ArtVpath *vec;
int i;
double r, th;
#define START 0
vec = art_new (ArtVpath, 6);
vec[0].code = ART_MOVETO;
vec[0].x = START;
vec[0].y = START;
vec[1].code = ART_LINETO;
vec[1].x = START;
vec[1].y = 512-START;
vec[2].code = ART_LINETO;
vec[2].x = 512-START;
vec[2].y = 512-START;
vec[3].code = ART_LINETO;
vec[3].x = 512-START;
vec[3].y = START;
vec[4].code = ART_LINETO;
vec[4].x = START;
vec[4].y = START;
vec[5].code = ART_END;
vec[5].x = 0;
vec[5].y = 0;
return vec;
}
static void
draw_test()
{
static ArtVpath *vpath = NULL;
static ArtSVP *svp = NULL;
ArtRender *render;
ArtPixMaxDepth color[3] = {0x0000, 0x0000, 0x8000 };
ArtGradientLinear gradient;
ArtGradientStop stops[3] = {
{ 0.02, { 0x7fff, 0x0000, 0x0000, 0x7fff }},
{ 0.5, { 0x0000, 0x0000, 0x0000, 0x1000 }},
{ 0.98, { 0x0000, 0x7fff, 0x0000, 0x7fff }}
};
if (!vpath) {
vpath = rect ();
svp = art_svp_from_vpath (vpath);
}
gradient.a = a;
gradient.b = b;
gradient.c = c;
gradient.spread = spread;
gradient.n_stops = sizeof(stops) / sizeof(stops[0]);
gradient.stops = stops;
render = art_render_new (0, 0,
width, height,
rgbdata, width * 3,
3, 8, ART_ALPHA_NONE,
NULL);
art_render_clear_rgb (render, 0xfff0c0);
art_render_svp (render, svp);
art_render_gradient_linear (render, &gradient, ART_FILTER_NEAREST);
// art_render_image_solid (render, color);
art_render_invoke (render);
}
/* Create a new backing pixmap of the appropriate size */
static gint configure_event( GtkWidget *widget,
GdkEventConfigure *event )
{
if (rgbdata)
free(rgbdata);
rgbdata = malloc(3*widget->allocation.width*widget->allocation.height);
width = widget->allocation.width;
height = widget->allocation.height;
draw_test();
return TRUE;
}
/* Redraw the screen from the backing pixmap */
static gint expose_event( GtkWidget *widget,
GdkEventExpose *event )
{
static GdkGC *copy_gc = NULL;
if (copy_gc == NULL) {
copy_gc = gdk_gc_new(widget->window);
}
gdk_draw_rgb_image(widget->window,
copy_gc,
event->area.x, event->area.y,
event->area.width, event->area.height,
GDK_RGB_DITHER_NONE,
rgbdata + event->area.x*3+event->area.y*3*width,
width*3 );
return FALSE;
}
static gint button_press_event( GtkWidget *widget,
GdkEventButton *event )
{
static GdkGC *copy_gc = NULL;
int x, y;
x = event->x;
y = event->y;
pos_x[pos_nr] = (double) x;
pos_y[pos_nr] = (double) y;
pos_nr = (pos_nr+1) % 2;
draw_test();
if (copy_gc == NULL) {
copy_gc = gdk_gc_new(widget->window);
}
gdk_draw_rgb_image(widget->window,
copy_gc,
0, 0,
width, height,
GDK_RGB_DITHER_NONE,
rgbdata, width*3 );
return TRUE;
}
static gint motion_notify_event( GtkWidget *widget,
GdkEventMotion *event )
{
static GdkGC *copy_gc = NULL;
int x, y;
GdkModifierType state;
if (event->is_hint) {
gdk_window_get_pointer (event->window, &x, &y, &state);
} else {
x = event->x;
y = event->y;
state = event->state;
}
if (state & GDK_BUTTON1_MASK && rgbdata != NULL) {
pos_x[(pos_nr+1) % 2] = (double) x;
pos_y[(pos_nr+1) % 2] = (double) y;
draw_test();
if (copy_gc == NULL) {
copy_gc = gdk_gc_new(widget->window);
}
gdk_draw_rgb_image(widget->window,
copy_gc,
0, 0,
width, height,
GDK_RGB_DITHER_NONE,
rgbdata, width*3 );
}
return TRUE;
}
void quit ()
{
gtk_exit (0);
}
static void
change_gradient (GtkEntry *entry,
double *ptr)
{
double d;
d = g_ascii_strtod (gtk_entry_get_text (entry), NULL);
if (d != 0.0)
*ptr = 1.0/d;
else
*ptr = 0.0;
draw_test();
gtk_widget_queue_draw (drawing_area);
}
static void
change_spread (GtkEntry *entry,
int *ptr)
{
double d;
d = g_ascii_strtod (gtk_entry_get_text (entry), NULL);
*ptr = (int)d;
draw_test();
gtk_widget_queue_draw (drawing_area);
}
int main( int argc,
char *argv[] )
{
GtkWidget *window;
GtkWidget *vbox;
char buf[G_ASCII_DTOSTR_BUF_SIZE];
GtkWidget *button;
GtkWidget *entry;
gtk_init (&argc, &argv);
gdk_rgb_init();
pos_x[0] = 100;
pos_y[0] = 100;
pos_x[1] = 300;
pos_y[1] = 300;
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_widget_set_name (window, "Test Input");
vbox = gtk_vbox_new (FALSE, 0);
gtk_container_add (GTK_CONTAINER (window), vbox);
gtk_widget_show (vbox);
gtk_signal_connect (GTK_OBJECT (window), "destroy",
GTK_SIGNAL_FUNC (quit), NULL);
/* Create the drawing area */
drawing_area = gtk_drawing_area_new ();
gtk_drawing_area_size (GTK_DRAWING_AREA (drawing_area), 512, 512);
gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0);
gtk_widget_show (drawing_area);
/* Signals used to handle backing pixmap */
gtk_signal_connect (GTK_OBJECT (drawing_area), "expose_event",
(GtkSignalFunc) expose_event, NULL);
gtk_signal_connect (GTK_OBJECT(drawing_area),"configure_event",
(GtkSignalFunc) configure_event, NULL);
/* Event signals */
gtk_signal_connect (GTK_OBJECT (drawing_area), "motion_notify_event",
(GtkSignalFunc) motion_notify_event, NULL);
gtk_signal_connect (GTK_OBJECT (drawing_area), "button_press_event",
(GtkSignalFunc) button_press_event, NULL);
gtk_widget_set_events (drawing_area, GDK_EXPOSURE_MASK
| GDK_LEAVE_NOTIFY_MASK
| GDK_BUTTON_PRESS_MASK
| GDK_POINTER_MOTION_MASK
| GDK_POINTER_MOTION_HINT_MASK);
entry = gtk_entry_new ();
gtk_box_pack_start (GTK_BOX (vbox), entry, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (entry), "activate",
GTK_SIGNAL_FUNC (change_gradient),
&a);
gtk_entry_set_text (GTK_ENTRY (entry),
g_ascii_dtostr (buf, G_ASCII_DTOSTR_BUF_SIZE,
1.0/a));
gtk_widget_show (entry);
entry = gtk_entry_new ();
gtk_box_pack_start (GTK_BOX (vbox), entry, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (entry), "activate",
GTK_SIGNAL_FUNC (change_gradient),
&b);
gtk_entry_set_text (GTK_ENTRY (entry),
g_ascii_dtostr (buf, G_ASCII_DTOSTR_BUF_SIZE,
1.0/b));
gtk_widget_show (entry);
entry = gtk_entry_new ();
gtk_box_pack_start (GTK_BOX (vbox), entry, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (entry), "activate",
GTK_SIGNAL_FUNC (change_gradient),
&c);
gtk_entry_set_text (GTK_ENTRY (entry),
g_ascii_dtostr (buf, G_ASCII_DTOSTR_BUF_SIZE,
1.0/c));
gtk_widget_show (entry);
entry = gtk_entry_new ();
gtk_box_pack_start (GTK_BOX (vbox), entry, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (entry), "activate",
GTK_SIGNAL_FUNC (change_spread),
&spread);
gtk_entry_set_text (GTK_ENTRY (entry),
g_strdup_printf ("%d", spread));
gtk_widget_show (entry);
/* .. And a quit button */
button = gtk_button_new_with_label ("Quit");
gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
gtk_signal_connect_object (GTK_OBJECT (button), "clicked",
GTK_SIGNAL_FUNC (gtk_widget_destroy),
GTK_OBJECT (window));
gtk_widget_show (button);
gtk_widget_show (window);
gtk_main ();
return 0;
}