cairodriver/read.c

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/*!
   \file lib/cairodriver/read.c
 
   \brief GRASS cairo display driver - read image (lower level functions)
 
   SPDX-FileCopyrightText: 2007-2008, 2011 Lars Ahlzen
   SPDX-FileCopyrightText: GRASS Development Team
   SPDX-License-Identifier: GPL-2.0-or-later
 
   \author Lars Ahlzen <lars ahlzen.com> (original contributor)
   \author Glynn Clements
 */
 
#include "cairodriver.h"
 
void cairo_read_image(void)
{
    G_debug(1, "read_image");
 
    if (!cairo || !surface)
        return;
 
    if (ca.file_type == FTYPE_PPM) {
        G_debug(1, "Reading image from %s", ca.file_name);
        cairo_read_ppm();
    }
    else if (ca.file_type == FTYPE_BMP) {
        G_debug(1, "Reading image from %s", ca.file_name);
        cairo_read_bmp();
    }
#if CAIRO_HAS_PNG_FUNCTIONS
    else if (ca.file_type == FTYPE_PNG) {
        cairo_surface_t *img_surf;
 
        G_debug(1, "Reading image from %s", ca.file_name);
 
        img_surf = cairo_image_surface_create_from_png(ca.file_name);
        if (!img_surf)
            return;
 
        cairo_save(cairo);
        cairo_set_source_surface(cairo, img_surf, 0, 0);
        cairo_paint(cairo);
        cairo_restore(cairo);
 
        cairo_surface_destroy(img_surf);
    }
#endif
#if CAIRO_HAS_XLIB_XRENDER_SURFACE
    else if (ca.file_type == FTYPE_X11) {
        G_debug(1, "Reading XID from %s", ca.file_name);
        cairo_read_xid();
    }
#endif
    /* vector format files are written directly to file */
 
    ca.modified = 0;
}