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#include <gtk/gtk.h>
#ifdef HAVE_CONFIG_H
#include <pixman-config.h>
#endif
#include "utils.h"
#include "gtk-utils.h"
pixman_image_t *
pixman_image_from_file (const char *filename, pixman_format_code_t format)
{
GdkPixbuf *pixbuf;
pixman_image_t *image;
int width, height;
uint32_t *data, *d;
uint8_t *gdk_data;
int n_channels;
int j, i;
int stride;
if (!(pixbuf = gdk_pixbuf_new_from_file (filename, NULL)))
return NULL;
image = NULL;
width = gdk_pixbuf_get_width (pixbuf);
height = gdk_pixbuf_get_height (pixbuf);
n_channels = gdk_pixbuf_get_n_channels (pixbuf);
gdk_data = gdk_pixbuf_get_pixels (pixbuf);
stride = gdk_pixbuf_get_rowstride (pixbuf);
if (!(data = malloc (width * height * sizeof (uint32_t))))
goto out;
d = data;
for (j = 0; j < height; ++j)
{
uint8_t *gdk_line = gdk_data;
for (i = 0; i < width; ++i)
{
int r, g, b, a;
uint32_t pixel;
r = gdk_line[0];
g = gdk_line[1];
b = gdk_line[2];
if (n_channels == 4)
a = gdk_line[3];
else
a = 0xff;
r = (r * a + 127) / 255;
g = (g * a + 127) / 255;
b = (b * a + 127) / 255;
pixel = (a << 24) | (r << 16) | (g << 8) | b;
*d++ = pixel;
gdk_line += n_channels;
}
gdk_data += stride;
}
image = pixman_image_create_bits (
format, width, height, data, width * 4);
out:
g_object_unref (pixbuf);
return image;
}
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 i;
for (i = 0; i < height; ++i)
{
uint32_t *src_row = &bits[i * (stride / 4)];
uint32_t *dst_row = p_bits + i * (p_stride / 4);
a8r8g8b8_to_rgba_np (dst_row, src_row, width);
}
return pixbuf;
}
static gboolean
on_draw (GtkWidget *widget, cairo_t *cr, gpointer user_data)
{
pixman_image_t *pimage = user_data;
int width = pixman_image_get_width (pimage);
int height = pixman_image_get_height (pimage);
int stride = pixman_image_get_stride (pimage);
cairo_surface_t *cimage;
cairo_format_t format;
if (pixman_image_get_format (pimage) == PIXMAN_x8r8g8b8)
format = CAIRO_FORMAT_RGB24;
else
format = CAIRO_FORMAT_ARGB32;
cimage = cairo_image_surface_create_for_data (
(uint8_t *)pixman_image_get_data (pimage),
format, width, height, stride);
cairo_rectangle (cr, 0, 0, width, height);
cairo_set_source_surface (cr, cimage, 0, 0);
cairo_fill (cr);
cairo_surface_destroy (cimage);
return TRUE;
}
void
show_image (pixman_image_t *image)
{
GtkWidget *window;
int width, height;
int argc;
char **argv;
char *arg0 = g_strdup ("pixman-test-program");
pixman_format_code_t format;
pixman_image_t *copy;
argc = 1;
argv = (char **)&arg0;
gtk_init (&argc, &argv);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
width = pixman_image_get_width (image);
height = pixman_image_get_height (image);
gtk_window_set_default_size (GTK_WINDOW (window), width, height);
format = pixman_image_get_format (image);
/* We always display the image as if it contains sRGB data. That
* means that no conversion should take place when the image
* has the a8r8g8b8_sRGB format.
*/
switch (format)
{
case PIXMAN_a8r8g8b8_sRGB:
case PIXMAN_a8r8g8b8:
case PIXMAN_x8r8g8b8:
copy = pixman_image_ref (image);
break;
default:
copy = pixman_image_create_bits (PIXMAN_a8r8g8b8,
width, height, NULL, -1);
pixman_image_composite32 (PIXMAN_OP_SRC,
image, NULL, copy,
0, 0, 0, 0, 0, 0,
width, height);
break;
}
g_signal_connect (window, "draw", G_CALLBACK (on_draw), copy);
g_signal_connect (window, "delete_event", G_CALLBACK (gtk_main_quit), NULL);
gtk_widget_show (window);
gtk_main ();
}
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