296 lines
9.9 KiB
Python
296 lines
9.9 KiB
Python
#
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# Gramps - a GTK+/GNOME based genealogy program
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#
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# Copyright (C) 2000-2006 Donald N. Allingham
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# Copyright (C) 2011 Adam Stein <adam@csh.rit.edu>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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"""
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Image manipulation routines.
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"""
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#-------------------------------------------------------------------------
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#
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# Standard python modules
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#
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#-------------------------------------------------------------------------
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import os
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import sys
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import tempfile
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#-------------------------------------------------------------------------
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#
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# GTK/Gnome modules
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#
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#-------------------------------------------------------------------------
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#-------------------------------------------------------------------------
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#
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# Gramps modules
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#
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#-------------------------------------------------------------------------
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from ..constfunc import conv_to_unicode
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from ..const import GRAMPS_LOCALE as glocale
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_ = glocale.translation.gettext
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def crop_percentage_to_subpixel(width, height, crop):
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"""
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Convert from Gramps cropping coordinates [0, 100] to
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pixels, given image width and height. No rounding to pixel resolution.
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"""
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return (
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crop[0]/100.0*width,
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crop[1]/100.0*height,
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crop[2]/100.0*width,
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crop[3]/100.0*height )
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def crop_percentage_to_pixel(width, height, crop):
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return map (int, crop_percentage_to_subpixel(width, height, crop))
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#-------------------------------------------------------------------------
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#
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# resize_to_jpeg
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#
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#-------------------------------------------------------------------------
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def resize_to_jpeg(source, destination, width, height, crop=None):
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"""
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Create the destination, derived from the source, resizing it to the
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specified size, while converting to JPEG.
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:param source: source image file, in any format that gtk recognizes
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:type source: unicode
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:param destination: destination image file, output written in jpeg format
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:type destination: unicode
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:param width: desired width of the destination image
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:type width: int
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:param height: desired height of the destination image
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:type height: int
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:param crop: cropping coordinates
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:type crop: array of integers ([start_x, start_y, end_x, end_y])
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"""
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from gi.repository import GdkPixbuf
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img = GdkPixbuf.Pixbuf.new_from_file(source)
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if crop:
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(start_x, start_y, end_x, end_y
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) = crop_percentage_to_pixel(
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img.get_width(), img.get_height(), crop)
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if sys.version_info[0] < 3:
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img = img.new_subpixbuf(start_x, start_y, end_x-start_x, end_y-start_y)
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else:
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img = img.subpixbuf(start_x, start_y, end_x-start_x, end_y-start_y)
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# Need to keep the ratio intact, otherwise scaled images look stretched
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# if the dimensions aren't close in size
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(width, height) = image_actual_size(width, height, img.get_width(), img.get_height())
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scaled = img.scale_simple(int(width), int(height), GdkPixbuf.InterpType.BILINEAR)
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scaled.savev(destination, "jpeg" "", "")
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#-------------------------------------------------------------------------
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#
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# image_dpi
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#
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#-------------------------------------------------------------------------
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MM_PER_INCH = 25.4
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def image_dpi(source):
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"""
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Return the dpi found in the image header. Use a sensible
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default of the screen DPI or 96.0 dpi if N/A.
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:param source: source image file, in any format that PIL recognizes
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:type source: unicode
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:rtype: int
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:returns: (x_dpi, y_dpi)
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"""
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try:
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import PIL.Image
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except ImportError:
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import logging
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logging.warning(_("WARNING: PIL module not loaded. "
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"Image cropping in report files will be impaired."))
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else:
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try:
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img = PIL.Image.open(source)
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except IOError:
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pass
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else:
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try:
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dpi = img.info["dpi"]
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return dpi
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except (AttributeError, KeyError):
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pass
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try:
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from gi.repository import Gdk
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s = Gdk.Display.get_default().get_default_screen()
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dpi = (
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s.get_width() * MM_PER_INCH / s.get_width_mm(),
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s.get_height() * MM_PER_INCH / s.get_height_mm()
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)
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except:
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dpi = (96.0,96.0) #LibOO 3.6 assumes this if image contains no DPI info
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# This isn't safe even within a single platform (Windows), but we
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# can't do better if all of the above failed. See bug# 7290.
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return dpi
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#-------------------------------------------------------------------------
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#
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# image_size
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#
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#-------------------------------------------------------------------------
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def image_size(source):
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"""
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Return the width and size of the specified image.
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:param source: source image file, in any format that gtk recongizes
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:type source: unicode
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:rtype: tuple(int, int)
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:returns: a tuple consisting of the width and height
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"""
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from gi.repository import GdkPixbuf
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from gi.repository import GObject
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try:
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img = GdkPixbuf.Pixbuf.new_from_file(source)
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width = img.get_width()
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height = img.get_height()
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except GObject.GError:
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width = 0
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height = 0
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return (width, height)
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#-------------------------------------------------------------------------
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#
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# image_actual_size
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#
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#-------------------------------------------------------------------------
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def image_actual_size(x_cm, y_cm, x, y):
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"""
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Calculate what the actual width & height of the image should be.
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:param x_cm: width in centimeters
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:type source: int
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:param y_cm: height in centimeters
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:type source: int
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:param x: desired width in pixels
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:type source: int
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:param y: desired height in pixels
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:type source: int
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:rtype: tuple(int, int)
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:returns: a tuple consisting of the width and height in centimeters
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"""
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ratio = float(x_cm)*float(y)/(float(y_cm)*float(x))
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if ratio < 1:
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act_width = x_cm
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act_height = y_cm*ratio
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else:
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act_height = y_cm
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act_width = x_cm/ratio
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return (act_width, act_height)
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#-------------------------------------------------------------------------
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#
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# resize_to_buffer
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#
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#-------------------------------------------------------------------------
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def resize_to_buffer(source, size, crop=None):
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"""
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Loads the image and resizes it. Instead of saving the file, the data
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is returned in a buffer.
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:param source: source image file, in any format that gtk recognizes
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:type source: unicode
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:param size: desired size of the destination image ([width, height])
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:type size: list
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:param crop: cropping coordinates
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:type crop: array of integers ([start_x, start_y, end_x, end_y])
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:rtype: buffer of data
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:returns: raw data
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"""
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from gi.repository import GdkPixbuf
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img = GdkPixbuf.Pixbuf.new_from_file(source)
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if crop:
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(start_x, start_y, end_x, end_y
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) = crop_percentage_to_pixel(
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img.get_width(), img.get_height(), crop)
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if sys.version_info[0] < 3:
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img = img.new_subpixbuf(start_x, start_y, end_x-start_x, end_y-start_y)
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else:
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img = img.subpixbuf(start_x, start_y, end_x-start_x, end_y-start_y)
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# Need to keep the ratio intact, otherwise scaled images look stretched
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# if the dimensions aren't close in size
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(size[0], size[1]) = image_actual_size(size[0], size[1], img.get_width(), img.get_height())
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scaled = img.scale_simple(int(size[0]), int(size[1]), GdkPixbuf.InterpType.BILINEAR)
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return scaled
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#-------------------------------------------------------------------------
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#
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# resize_to_jpeg_buffer
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#
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#-------------------------------------------------------------------------
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def resize_to_jpeg_buffer(source, size, crop=None):
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"""
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Loads the image, converting the file to JPEG, and resizing it. Instead of
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saving the file, the data is returned in a buffer.
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:param source: source image file, in any format that gtk recognizes
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:type source: unicode
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:param size: desired size of the destination image ([width, height])
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:type size: list
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:param crop: cropping coordinates
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:type crop: array of integers ([start_x, start_y, end_x, end_y])
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:rtype: buffer of data
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:returns: jpeg image as raw data
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"""
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from gi.repository import GdkPixbuf
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filed, dest = tempfile.mkstemp()
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img = GdkPixbuf.Pixbuf.new_from_file(source)
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if crop:
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(start_x, start_y, end_x, end_y
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) = crop_percentage_to_pixel(
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img.get_width(), img.get_height(), crop)
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if sys.version_info[0] < 3:
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img = img.new_subpixbuf(start_x, start_y, end_x-start_x, end_y-start_y)
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else:
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img = img.subpixbuf(start_x, start_y, end_x-start_x, end_y-start_y)
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# Need to keep the ratio intact, otherwise scaled images look stretched
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# if the dimensions aren't close in size
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(size[0], size[1]) = image_actual_size(size[0], size[1], img.get_width(), img.get_height())
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scaled = img.scale_simple(int(size[0]), int(size[1]), GdkPixbuf.InterpType.BILINEAR)
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os.close(filed)
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dest = conv_to_unicode(dest, None)
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scaled.savev(dest, "jpeg", "", "")
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ofile = open(dest, mode='rb')
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data = ofile.read()
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ofile.close()
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try:
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os.unlink(dest)
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except:
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pass
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return data
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