156 lines
3.0 KiB
C
156 lines
3.0 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include "pixman.h"
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#include <gtk/gtk.h>
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static 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 rgba;
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rgba = (argb << 8) | (argb >> 24);
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p_bits[h * (p_stride / 4) + w] = rgba;
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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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gtk_widget_show (window);
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gtk_main ();
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}
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#define WIDTH 100
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#define HEIGHT 100
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static uint32_t
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reader (const void *src, int size)
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{
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switch (size)
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{
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case 1:
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return *(uint8_t *)src;
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case 2:
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return *(uint16_t *)src;
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case 4:
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return *(uint32_t *)src;
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default:
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g_assert_not_reached();
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}
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}
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static void
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writer (void *src, uint32_t value, int size)
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{
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switch (size)
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{
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case 1:
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*(uint8_t *)src = value;
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break;
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case 2:
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*(uint16_t *)src = value;
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break;
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case 4:
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*(uint32_t *)src = value;
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break;
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}
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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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uint32_t *src = malloc (WIDTH * HEIGHT * 4);
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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, j;
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gtk_init (&argc, &argv);
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for (i = 0; i < WIDTH * HEIGHT; ++i)
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src[i] = 0x7f7f0000; /* red */
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for (i = 0; i < WIDTH * HEIGHT; ++i)
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dest[i] = 0x7f0000ff; /* blue */
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src_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
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WIDTH, HEIGHT,
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src,
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WIDTH * 4);
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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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pixman_image_set_accessors (src_img, reader, writer);
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pixman_image_set_accessors (dest_img, reader, writer);
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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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#if 0
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for (i = 0; i < WIDTH; ++i)
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{
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for (j = 0; j < HEIGHT; ++j)
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g_print ("%x, ", dest[i * WIDTH + j]);
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g_print ("\n");
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}
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#endif
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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 (src);
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free (dest);
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return 0;
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}
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