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# -*- mode:python; tab-width:4; indent-tabs-mode:t; -*-
# sliderenderer.py
#
# Class for rendering slides to a surface
# B. Mayton <bmayton@cs.washington.edu>
#
# 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import cairo
import rsvg
import gtk
import os
import utils
import time
import logging
class Renderer(object):
def __init__(self, deck):
"""Constructs a new SlideRenderer that will render slides from deck"""
self.__logger = logging.getLogger('Renderer')
self.__logger.setLevel('error')
self.__deck = deck
def getSlideDimensionsFromFirstLayer(self, n=None):
"""Returns the [width, height] of the first slide layer"""
if n is None:
n = self.__deck.getIndex()
layers = self.__deck.getSlideLayers(n)
# return some default reasonable value if this is an empty slide
if len(layers) == 0:
return [640.0, 480.0]
ftype = utils.getFileType(layers[0])
# This may be optimizable to avoid having to open the first layer to get its size,
# or at least keeping it around to re-use it when the slide is first rendered
if ftype == "svg":
f = open(layers[0], 'rb')
svg_data = f.read()
f.close()
handle = rsvg.Handle(data=svg_data)
a, b, w, h = handle.get_dimension_data()
return [w,h]
elif ftype == "png":
surface = cairo.ImageSurface.create_from_png(layers[0])
return [float(surface.get_width()), float(surface.get_height())]
elif ftype == "jpg":
pbuf = gtk.gdk.pixbuf_new_from_file(layers[0])
return [float(pbuf.get_width()), float(pbuf.get_height())]
else:
return [640.0, 480.0]
def getSlideDimensions(self, n=None):
"""Returns the slide dimensions, using the value in the XML file first, if it exists, and then the size of the first layer"""
if n is None:
n = self.__deck.getIndex()
dims = self.__deck.getSlideDimensionsFromXML(n)
if dims == False:
return self.getSlideDimensionsFromFirstLayer(n)
else:
w, h = dims
return [w, h]
def renderSlideToSurface(self, surface, n=None):
if n is None:
n = self.__deck.getIndex()
timerstart = time.time()
self.__logger.debug("rendering slide " + str(n))
ctx = gtk.gdk.CairoContext(cairo.Context(surface))
#ctx = cairo.Context(surface)
self.__logger.debug("Got context at " + str(time.time() - timerstart))
# Get the slide dimensions and set up a Cairo transformation matrix
srcw, srch = self.getSlideDimensions(n)
if srcw > 640:
srcw = 640
if srch > 480:
srch = 480
targw = float(surface.get_width())
targh = float(surface.get_height())
x_scale = targw/srcw
y_scale = targh/srch
print 'rendering slide', str(n), "w=", targw, srcw, x_scale, "h=", targh, srch, y_scale
self.__logger.debug("Surface is " + str(targw) + "x" + str(targh))
scale = x_scale
if y_scale < x_scale:
scale = y_scale
if scale < .98 or scale > 1.02:
ctx.transform(cairo.Matrix(scale, 0, 0, scale, 0, 0))
self.__logger.debug("Got transformation matrix at " + str(time.time() - timerstart))
# Paint the slide background
ctx.set_source_rgb(1.0, 1.0, 1.0)
ctx.rectangle(0, 0, srcw, srch)
ctx.fill()
self.__logger.debug("Filled background at " + str(time.time() - timerstart))
# Paint the layers
layers = self.__deck.getSlideLayers(n)
self.__logger.debug("Got layers at " + str(time.time() - timerstart))
for layer in layers:
type = utils.getFileType(layer)
self.__logger.debug("Drawing layer " + str(layer) +" " + str(scale) + " at " + str(time.time() - timerstart))
print 'drawing layer', type, str(layer)
if type == "svg":
f = open(layer, "rb")
svg_data = f.read()
f.close()
handle = rsvg.Handle(data=svg_data)
handle.render_cairo(ctx)
elif type == "png":
png_surface = cairo.ImageSurface.create_from_png(layer)
self.__logger.debug("Got PNG surface at "+ str(time.time() - timerstart))
ctx.set_source_surface(png_surface, 0, 0)
ctx.rectangle(0, 0, png_surface.get_width(), png_surface.get_height())
ctx.fill()
elif type == "jpg":
jpg_pixbuf = gtk.gdk.pixbuf_new_from_file(layer)
self.__logger.debug("Got JPG pixbuf at "+ str(time.time() - timerstart))
ctx.set_source_pixbuf(jpg_pixbuf, 0, 0)
ctx.rectangle(0, 0, jpg_pixbuf.get_width(), jpg_pixbuf.get_height())
ctx.fill()
self.__logger.debug("Finished drawing layer at "+ str(time.time() - timerstart))
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