# # Gramps - a GTK+/GNOME based genealogy program # # Copyright (C) 2000-2006 Donald N. Allingham # Copyright (C) 2011 Adam Stein # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA # # $Id:ImgManip.py 9912 2008-01-22 09:17:46Z acraphae $ """ Image manipulation routines. """ #------------------------------------------------------------------------- # # Standard python modules # #------------------------------------------------------------------------- import os import tempfile #------------------------------------------------------------------------- # # GTK/Gnome modules # #------------------------------------------------------------------------- #------------------------------------------------------------------------- # # Gramps modules # #------------------------------------------------------------------------- import Utils #------------------------------------------------------------------------- # # resize_to_jpeg # #------------------------------------------------------------------------- def resize_to_jpeg(source, destination, width, height, crop=None): """ Create the destination, derived from the source, resizing it to the specified size, while converting to JPEG. :param source: source image file, in any format that gtk recognizes :type source: unicode :param destination: destination image file, output written in jpeg format :type destination: unicode :param width: desired width of the destination image :type width: int :param height: desired height of the destination image :type height: int :param crop: cropping coordinates :type crop: array of integers ([start_x, start_y, end_x, end_y]) """ import gtk img = gtk.gdk.pixbuf_new_from_file(source) if crop: # Gramps cropping coorinates are [0, 100], so we need to convert to pixels start_x = int((crop[0]/100.0)*img.get_width()) start_y = int((crop[1]/100.0)*img.get_height()) end_x = int((crop[2]/100.0)*img.get_width()) end_y = int((crop[3]/100.0)*img.get_height()) img = img.subpixbuf(start_x, start_y, end_x-start_x, end_y-start_y) # Need to keep the ratio intact, otherwise scaled images look stretched # if the dimensions aren't close in size (width, height) = image_actual_size(width, height, img.get_width(), img.get_height()) scaled = img.scale_simple(int(width), int(height), gtk.gdk.INTERP_BILINEAR) scaled.save(destination, 'jpeg') #------------------------------------------------------------------------- # # image_dpi # #------------------------------------------------------------------------- def image_dpi(source): """ Return the dpi found in the image header. None is returned if no dpi attribute is available. :param source: source image file, in any format that PIL recognizes :type source: unicode :rtype: int :returns: the DPI setting in the image header """ try: import PIL.Image except ImportError: import sys print >> sys.stderr, _("WARNING: PIL module not loaded. " "Image cropping in report files will not be available.") dpi = None else: try: img = PIL.Image.open(source) except IOError: dpi = None else: try: dpi = img.info["dpi"] except AttributeError, KeyError: dpi = None return dpi #------------------------------------------------------------------------- # # image_size # #------------------------------------------------------------------------- def image_size(source): """ Return the width and size of the specified image. :param source: source image file, in any format that gtk recongizes :type source: unicode :rtype: tuple(int, int) :returns: a tuple consisting of the width and height """ import gtk import gobject try: img = gtk.gdk.pixbuf_new_from_file(source) width = img.get_width() height = img.get_height() except gobject.GError: width = 0 height = 0 return (width, height) #------------------------------------------------------------------------- # # image_actual_size # #------------------------------------------------------------------------- def image_actual_size(x_cm, y_cm, x, y): """ Calculate what the actual width & height of the image should be. :param x_cm: width in centimeters :type source: int :param y_cm: height in centimeters :type source: int :param x: desired width in pixels :type source: int :param y: desired height in pixels :type source: int :rtype: tuple(int, int) :returns: a tuple consisting of the width and height in centimeters """ ratio = float(x_cm)*float(y)/(float(y_cm)*float(x)) if ratio < 1: act_width = x_cm act_height = y_cm*ratio else: act_height = y_cm act_width = x_cm/ratio return (act_width, act_height) #------------------------------------------------------------------------- # # resize_to_jpeg_buffer # #------------------------------------------------------------------------- def resize_to_jpeg_buffer(source, width, height): """ Loads the image, converting the file to JPEG, and resizing it. Instead of saving the file, the data is returned in a buffer. :param source: source image file, in any format that gtk recognizes :type source: unicode :param width: desired width of the destination image :type width: int :param height: desired height of the destination image :type height: int :rtype: buffer of data :returns: jpeg image as raw data """ import gtk filed, dest = tempfile.mkstemp() img = gtk.gdk.pixbuf_new_from_file(source) scaled = img.scale_simple(int(width), int(height), gtk.gdk.INTERP_BILINEAR) os.close(filed) dest = Utils.get_unicode_path_from_env_var(dest) scaled.save(dest, 'jpeg') ofile = open(dest, mode='rb') data = ofile.read() ofile.close() try: os.unlink(dest) except: pass return data