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#include <stdio.h>
#include <stdlib.h>
#include <gtk/gtk.h>
#include "pixman.h"
GdkPixbuf *
pixbuf_from_argb32 (uint32_t *bits,
int width,
int height,
int stride)
{
GdkPixbuf *pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE,
8, width, height);
int p_stride = gdk_pixbuf_get_rowstride (pixbuf);
guint32 *p_bits = (guint32 *)gdk_pixbuf_get_pixels (pixbuf);
int w, h;
for (h = 0; h < height; ++h)
{
for (w = 0; w < width; ++w)
{
uint32_t argb = bits[h * stride + w];
guint32 abgr;
abgr = (argb & 0xff000000) |
(argb & 0xff) << 16 |
(argb & 0x00ff00) |
(argb & 0xff0000) >> 16;
p_bits[h * (p_stride / 4) + w] = abgr;
}
}
return pixbuf;
}
static gboolean
on_expose (GtkWidget *widget, GdkEventExpose *expose, gpointer data)
{
GdkPixbuf *pixbuf = data;
gdk_draw_pixbuf (widget->window, NULL,
pixbuf, 0, 0, 0, 0,
gdk_pixbuf_get_width (pixbuf),
gdk_pixbuf_get_height (pixbuf),
GDK_RGB_DITHER_NONE,
0, 0);
return TRUE;
}
static void
show_window (uint32_t *bits, int w, int h, int stride)
{
GdkPixbuf *pixbuf;
GtkWidget *window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
pixbuf = pixbuf_from_argb32 (bits, w, h, stride);
g_signal_connect (window, "expose_event", G_CALLBACK (on_expose), pixbuf);
g_signal_connect (window, "delete_event", G_CALLBACK (gtk_main_quit), NULL);
gtk_widget_show (window);
gtk_main ();
}
int
main (int argc, char **argv)
{
#define WIDTH 200
#define HEIGHT 200
uint32_t *dest = malloc (WIDTH * HEIGHT * 4);
pixman_image_t *src_img;
pixman_image_t *dest_img;
int i;
pixman_gradient_stop_t stops[2] =
{
{ pixman_int_to_fixed (0), { 0xffff, 0x0000, 0x0000, 0xffff } },
{ pixman_int_to_fixed (1), { 0xffff, 0xffff, 0x0000, 0xffff } }
};
pixman_point_fixed_t p1 = { 0, 0 };
pixman_point_fixed_t p2 = { pixman_int_to_fixed (WIDTH),
pixman_int_to_fixed (HEIGHT) };
pixman_transform_t trans = {
{ { pixman_double_to_fixed (2), pixman_double_to_fixed (0.5), pixman_double_to_fixed (-100), },
{ pixman_double_to_fixed (0), pixman_double_to_fixed (2), pixman_double_to_fixed (0), },
{ pixman_double_to_fixed (0), pixman_double_to_fixed (0.004990), pixman_double_to_fixed (1.0) }
}
};
pixman_transform_t id = {
{ { pixman_fixed_1, 0, 0 },
{ 0, pixman_fixed_1, 0 },
{ 0, 0, pixman_fixed_1 } }
};
pixman_point_fixed_t c_inner;
pixman_point_fixed_t c_outer;
pixman_fixed_t r_inner;
pixman_fixed_t r_outer;
gtk_init (&argc, &argv);
for (i = 0; i < WIDTH * HEIGHT; ++i)
dest[i] = 0x3f0000ff; /* pale blue */
dest_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
WIDTH, HEIGHT,
dest,
WIDTH * 4);
c_inner.x = pixman_double_to_fixed (50.0);
c_inner.y = pixman_double_to_fixed (50.0);
c_outer.x = pixman_double_to_fixed (50.0);
c_outer.y = pixman_double_to_fixed (50.0);
r_inner = 0;
r_outer = pixman_double_to_fixed (50.0);
src_img = pixman_image_create_radial_gradient (&c_inner, &c_outer,
r_inner, r_outer,
stops, 2);
#if 0
src_img = pixman_image_create_linear_gradient (&p1, &p2,
stops, 2);
#endif
pixman_image_set_transform (src_img, &trans);
pixman_image_composite (PIXMAN_OP_OVER, src_img, NULL, dest_img,
0, 0, 0, 0, 0, 0, WIDTH, HEIGHT);
printf ("0, 0: %x\n", dest[0]);
printf ("10, 10: %x\n", dest[10 * 10 + 10]);
printf ("w, h: %x\n", dest[(HEIGHT - 1) * 100 + (WIDTH - 1)]);
show_window (dest, WIDTH, HEIGHT, WIDTH);
pixman_image_unref (src_img);
pixman_image_unref (dest_img);
free (dest);
return 0;
}
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