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