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      1 #include <gtk/gtk.h>
      2 #include <config.h>
      3 #include "../test/utils.h"
      4 #include "gtk-utils.h"
      5 
      6 pixman_image_t *
      7 pixman_image_from_file (const char *filename, pixman_format_code_t format)
      8 {
      9     GdkPixbuf *pixbuf;
     10     pixman_image_t *image;
     11     int width, height;
     12     uint32_t *data, *d;
     13     uint8_t *gdk_data;
     14     int n_channels;
     15     int j, i;
     16     int stride;
     17 
     18     if (!(pixbuf = gdk_pixbuf_new_from_file (filename, NULL)))
     19 	return NULL;
     20 
     21     image = NULL;
     22 
     23     width = gdk_pixbuf_get_width (pixbuf);
     24     height = gdk_pixbuf_get_height (pixbuf);
     25     n_channels = gdk_pixbuf_get_n_channels (pixbuf);
     26     gdk_data = gdk_pixbuf_get_pixels (pixbuf);
     27     stride = gdk_pixbuf_get_rowstride (pixbuf);
     28 
     29     if (!(data = malloc (width * height * sizeof (uint32_t))))
     30 	goto out;
     31 
     32     d = data;
     33     for (j = 0; j < height; ++j)
     34     {
     35 	uint8_t *gdk_line = gdk_data;
     36 
     37 	for (i = 0; i < width; ++i)
     38 	{
     39 	    int r, g, b, a;
     40 	    uint32_t pixel;
     41 
     42 	    r = gdk_line[0];
     43 	    g = gdk_line[1];
     44 	    b = gdk_line[2];
     45 
     46 	    if (n_channels == 4)
     47 		a = gdk_line[3];
     48 	    else
     49 		a = 0xff;
     50 
     51 	    r = (r * a + 127) / 255;
     52 	    g = (g * a + 127) / 255;
     53 	    b = (b * a + 127) / 255;
     54 
     55 	    pixel = (a << 24) | (r << 16) | (g << 8) | b;
     56 
     57 	    *d++ = pixel;
     58 	    gdk_line += n_channels;
     59 	}
     60 
     61 	gdk_data += stride;
     62     }
     63 
     64     image = pixman_image_create_bits (
     65 	format, width, height, data, width * 4);
     66 
     67 out:
     68     g_object_unref (pixbuf);
     69     return image;
     70 }
     71 
     72 GdkPixbuf *
     73 pixbuf_from_argb32 (uint32_t *bits,
     74 		    int width,
     75 		    int height,
     76 		    int stride)
     77 {
     78     GdkPixbuf *pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE,
     79 					8, width, height);
     80     int p_stride = gdk_pixbuf_get_rowstride (pixbuf);
     81     guint32 *p_bits = (guint32 *)gdk_pixbuf_get_pixels (pixbuf);
     82     int i;
     83 
     84     for (i = 0; i < height; ++i)
     85     {
     86 	uint32_t *src_row = &bits[i * (stride / 4)];
     87 	uint32_t *dst_row = p_bits + i * (p_stride / 4);
     88 
     89 	a8r8g8b8_to_rgba_np (dst_row, src_row, width);
     90     }
     91 
     92     return pixbuf;
     93 }
     94 
     95 static gboolean
     96 on_expose (GtkWidget *widget, GdkEventExpose *expose, gpointer data)
     97 {
     98     pixman_image_t *pimage = data;
     99     int width = pixman_image_get_width (pimage);
    100     int height = pixman_image_get_height (pimage);
    101     int stride = pixman_image_get_stride (pimage);
    102     cairo_surface_t *cimage;
    103     cairo_format_t format;
    104     cairo_t *cr;
    105 
    106     if (pixman_image_get_format (pimage) == PIXMAN_x8r8g8b8)
    107 	format = CAIRO_FORMAT_RGB24;
    108     else
    109 	format = CAIRO_FORMAT_ARGB32;
    110 
    111     cimage = cairo_image_surface_create_for_data (
    112 	(uint8_t *)pixman_image_get_data (pimage),
    113 	format, width, height, stride);
    114 
    115     cr = gdk_cairo_create (widget->window);
    116 
    117     cairo_rectangle (cr, 0, 0, width, height);
    118     cairo_set_source_surface (cr, cimage, 0, 0);
    119     cairo_fill (cr);
    120 
    121     cairo_destroy (cr);
    122     cairo_surface_destroy (cimage);
    123 
    124     return TRUE;
    125 }
    126 
    127 void
    128 show_image (pixman_image_t *image)
    129 {
    130     GtkWidget *window;
    131     int width, height;
    132     int argc;
    133     char **argv;
    134     char *arg0 = g_strdup ("pixman-test-program");
    135     pixman_format_code_t format;
    136     pixman_image_t *copy;
    137 
    138     argc = 1;
    139     argv = (char **)&arg0;
    140 
    141     gtk_init (&argc, &argv);
    142 
    143     window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    144     width = pixman_image_get_width (image);
    145     height = pixman_image_get_height (image);
    146 
    147     gtk_window_set_default_size (GTK_WINDOW (window), width, height);
    148 
    149     format = pixman_image_get_format (image);
    150 
    151     /* We always display the image as if it contains sRGB data. That
    152      * means that no conversion should take place when the image
    153      * has the a8r8g8b8_sRGB format.
    154      */
    155     switch (format)
    156     {
    157     case PIXMAN_a8r8g8b8_sRGB:
    158     case PIXMAN_a8r8g8b8:
    159     case PIXMAN_x8r8g8b8:
    160 	copy = pixman_image_ref (image);
    161 	break;
    162 
    163     default:
    164 	copy = pixman_image_create_bits (PIXMAN_a8r8g8b8,
    165 					 width, height, NULL, -1);
    166 	pixman_image_composite32 (PIXMAN_OP_SRC,
    167 				  image, NULL, copy,
    168 				  0, 0, 0, 0, 0, 0,
    169 				  width, height);
    170 	break;
    171     }
    172 
    173     g_signal_connect (window, "expose_event", G_CALLBACK (on_expose), copy);
    174     g_signal_connect (window, "delete_event", G_CALLBACK (gtk_main_quit), NULL);
    175 
    176     gtk_widget_show (window);
    177 
    178     gtk_main ();
    179 }
    180