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f-image-surface.c

#include <gdk/gdk.h>
#include <cairo.h>

const cairo_user_data_key_t pixel_key;
const cairo_user_data_key_t format_key;

cairo_surface_t *
f_image_surface_create (cairo_format_t format, int width, int height)
{
      int size;
      cairo_surface_t *surface;
      unsigned char *pixels;

      switch (format) {
      case CAIRO_FORMAT_ARGB32:
      case CAIRO_FORMAT_RGB24:
            size = 4;
            break;
      case CAIRO_FORMAT_A8:
            size = 8;
            break;
      case CAIRO_FORMAT_A1:
            size = 1;
            break;
      }

      pixels = g_malloc (width * height * size);
      surface = cairo_image_surface_create_for_data (pixels,
                                           format,
                                           width,
                                           height,
                                           width * size);

      cairo_surface_set_user_data (surface, &pixel_key, pixels, g_free);
      cairo_surface_set_user_data (surface, &format_key, GINT_TO_POINTER (format), NULL);

      return surface;
}

void  *
f_image_surface_get_data (cairo_surface_t *surface)
{
      return cairo_surface_get_user_data (surface, &pixel_key);
}

cairo_format_t
f_image_surface_get_format (cairo_surface_t *surface)
{
      return GPOINTER_TO_INT (cairo_surface_get_user_data (surface, &format_key));
}

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