forked from openlp/openlp
445 lines
19 KiB
Python
445 lines
19 KiB
Python
# -*- coding: utf-8 -*-
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# vim: autoindent shiftwidth=4 expandtab textwidth=80 tabstop=4 softtabstop=4
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"""
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OpenLP - Open Source Lyrics Projection
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Copyright (c) 2008 Raoul Snyman
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Portions copyright (c) 2008-2009 Martin Thompson, Tim Bentley
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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"""
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import logging
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import os, os.path
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import sys
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#from copy import copy
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from PyQt4 import QtGui, QtCore, Qt
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class Renderer:
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"""
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Genarates a pixmap image of a array of text. The Text is formatted to
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make sure it fits on the screen and if not extra frames a generated.
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"""
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global log
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log = logging.getLogger(u'Renderer')
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log.info(u'Renderer Loaded')
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def __init__(self):
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self._rect = None
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self._debug = 0
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#self.words = None
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self._right_margin = 64 # the amount of right indent
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self._shadow_offset = 5
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self._outline_offset = 2
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self.theme_name = None
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self._theme = None
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self._bg_image_filename = None
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self._frame = None
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self._bg_frame = None
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self.bg_image = None
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self._bg_frame_small = None
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def set_debug(self, debug):
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self._debug=debug
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def set_theme(self, theme):
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"""
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External API to pass in the theme to be used
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"""
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log.debug(u'set theme')
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self._theme = theme
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self._bg_frame = None
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self.bg_image = None
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self.theme_name = theme.theme_name
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self._set_theme_font()
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if theme.background_type == u'image':
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if theme.background_filename is not None:
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self.set_bg_image(theme.background_filename)
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def set_bg_image(self, filename):
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log.debug(u'set bg image %s', filename)
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self._bg_image_filename = str(filename)
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if self._frame is not None:
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self.scale_bg_image()
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def scale_bg_image(self):
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assert self._frame
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preview = QtGui.QPixmap(self._bg_image_filename)
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width = self._frame.width()
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height = self._frame.height()
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preview = preview.scaled(width, height, QtCore.Qt.KeepAspectRatio, QtCore.Qt.SmoothTransformation)
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realwidth = preview.width()
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realheight = preview.height()
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# and move it to the centre of the preview space
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self.bg_image = QtGui.QPixmap(width, height)
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self.bg_image.fill(QtCore.Qt.transparent)
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painter = QtGui.QPainter(self.bg_image)
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self.background_offsetx = (width - realwidth) / 2
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self.background_offsety = (height - realheight) / 2
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painter.drawPixmap(self.background_offsetx, self.background_offsety , preview)
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def set_frame_dest(self, frame_width, frame_height, preview=False):
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"""
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External API to pass the frame size to be painted
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"""
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if preview == True:
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self._bg_frame = None
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log.debug(u'set frame dest (frame) w %d h %d', frame_width, frame_height)
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self._frame = QtGui.QPixmap(frame_width, frame_height)
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if self._bg_image_filename is not None and self.bg_image is None:
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self.scale_bg_image()
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if self._bg_frame is None:
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self._generate_background_frame()
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def format_slide(self, words, footer):
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"""
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External API to sort out the text to pe placed on the frame
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"""
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log.debug(u'format_slide - Start')
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verses = []
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words = words.replace(u'\r\n', u'\n')
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verses_text = words.split(u'\n\n')
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text = []
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for verse in verses_text:
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lines = verse.split(u'\n')
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for line in lines:
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text.append(line)
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split_text = self._split_set_of_lines(text, False)
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log.debug(u'format_slide - End')
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return split_text
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def set_text_rectangle(self, rect_main, rect_footer):
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"""
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Sets the rectangle within which text should be rendered
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"""
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self._rect = rect_main
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self._rect_footer = rect_footer
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def generate_frame_from_lines(self, lines, footer_lines=None):
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"""
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Render a set of lines according to the theme, return bounding box
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"""
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#print "########## Generate frame from lines ##################"
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log.debug(u'generate_frame_from_lines - Start')
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#print "Render Lines ", lines
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bbox = self._render_lines_unaligned(lines, False)
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if footer_lines is not None:
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bbox1 = self._render_lines_unaligned(footer_lines, True)
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# reset the frame. first time do not worry about what you paint on.
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self._frame = QtGui.QPixmap(self._frame.width(), self._frame.height()) #(self._bg_frame)
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self._frame.fill(QtCore.Qt.transparent)
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x, y = self._correctAlignment(self._rect, bbox)
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bbox = self._render_lines_unaligned(lines, False, (x, y))
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if footer_lines is not None:
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bbox = self._render_lines_unaligned(footer_lines, True, (self._rect_footer.left(), self._rect_footer.top()) )
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log.debug(u'generate_frame_from_lines - Finish')
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return self._frame
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def _generate_background_frame(self):
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"""
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Generate a background frame to the same size as the frame to be used
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Results cached for performance reasons.
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"""
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assert(self._theme)
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self._bg_frame = QtGui.QPixmap(self._frame.width(), self._frame.height())
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log.debug(u'render background %s start', self._theme.background_type)
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painter = QtGui.QPainter()
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painter.begin(self._bg_frame)
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if self._theme.background_type == u'solid':
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painter.fillRect(self._frame.rect(), QtGui.QColor(self._theme.background_color))
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elif self._theme.background_type == u'gradient' : # gradient
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gradient = None
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if self._theme.background_direction == u'horizontal':
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w = int(self._frame.width()) / 2
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gradient = QtGui.QLinearGradient(w, 0, w, self._frame.height()) # vertical
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elif self._theme.background_direction == u'vertical':
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h = int(self._frame.height()) / 2
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gradient = QtGui.QLinearGradient(0, h, self._frame.width(), h) # Horizontal
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else:
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w = int(self._frame.width()) / 2
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h = int(self._frame.height()) / 2
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gradient = QtGui.QRadialGradient(w, h, w) # Circular
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gradient.setColorAt(0, QtGui.QColor(self._theme.background_startColor))
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gradient.setColorAt(1, QtGui.QColor(self._theme.background_endColor))
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painter.setBrush(QtGui.QBrush(gradient))
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rectPath = QtGui.QPainterPath()
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max_x = self._frame.width()
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max_y = self._frame.height()
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rectPath.moveTo(0, 0)
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rectPath.lineTo(0, max_y)
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rectPath.lineTo(max_x, max_y)
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rectPath.lineTo(max_x, 0)
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rectPath.closeSubpath()
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painter.drawPath(rectPath)
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elif self._theme.background_type== u'image':
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if self.bg_image is not None:
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painter.drawPixmap(0 ,0 , self.bg_image)
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else:
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painter.fillRect(self._frame.rect(), QtGui.QColor(u'#000000'))
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painter.end()
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self._bg_frame_small = self._bg_frame.scaled(QtCore.QSize(280, 210), QtCore.Qt.KeepAspectRatio,
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QtCore.Qt.SmoothTransformation)
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log.debug(u'render background End')
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def _split_set_of_lines(self, lines, footer):
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"""
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Given a list of lines, decide how to split them best if they don't all fit on the screen
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- this is done by splitting at 1/2, 1/3 or 1/4 of the set
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If it doesn't fit, even at this size, just split at each opportunity.
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We'll do this by getting the bounding box of each line, and then summing them appropriately
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Returns a list of [lists of lines], one set for each screenful
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"""
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bboxes = []
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for line in lines:
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bboxes.append(self._render_and_wrap_single_line(line, footer))
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numlines = len(lines)
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bottom = self._rect.bottom()
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for ratio in (numlines, numlines/2, numlines/3, numlines/4):
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good = 1
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startline = 0
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endline = startline + ratio
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while (endline <= numlines and endline != 0):
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by = 0
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for (x,y) in bboxes[startline:endline]:
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by += y
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if by > bottom:
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good = 0
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break
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startline += ratio
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endline = startline + ratio
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if good == 1:
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break
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retval = []
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numlines_per_page = ratio
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if good:
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c = 0
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thislines = []
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while c < numlines:
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thislines.append(lines[c])
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c += 1
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if len(thislines) == numlines_per_page:
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retval.append(thislines)
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thislines = []
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if len(thislines) > 0:
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retval.append(thislines)
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else:
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# print "Just split where you can"
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retval = []
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startline = 0
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endline = startline + 1
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while (endline <= numlines):
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by = 0
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for (x,y) in bboxes[startline:endline]:
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by += y
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if by > bottom:
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retval.append(lines[startline:endline-1])
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startline = endline-1
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# gets incremented below
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endline = startline
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by = 0
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endline += 1
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return retval
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def _correctAlignment(self, rect, bbox):
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x = rect.left()
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if int(self._theme.display_verticalAlign) == 0: # top align
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y = rect.top()
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elif int(self._theme.display_verticalAlign) == 2: # bottom align
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y = rect.bottom() - bbox.height()
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elif int(self._theme.display_verticalAlign) == 1: # centre align
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y = rect.top() + (rect.height() - bbox.height()) / 2
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else:
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log.error(u'Invalid value for theme.VerticalAlign:%s' % self._theme.display_verticalAlign)
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return x, y
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def _render_lines_unaligned(self, lines, footer, tlcorner=(0,0)):
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"""
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Given a list of lines to render, render each one in turn
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(using the _render_single_line fn - which may result in going
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off the bottom) They are expected to be pre-arranged to less
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than a screenful (eg. by using split_set_of_lines)
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Returns the bounding box of the text as QRect
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"""
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x, y = tlcorner
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brx = x
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bry = y
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for line in lines:
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# render after current bottom, but at original left edge
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# keep track of right edge to see which is biggest
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(thisx, bry) = self._render_and_wrap_single_line(line, footer, (x , bry))
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if (thisx > brx):
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brx = thisx
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retval = QtCore.QRect(x, y,brx-x, bry-y)
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if self._debug:
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painter = QtGui.QPainter()
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painter.begin(self._frame)
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painter.setPen(QtGui.QPen(QtGui.QColor(0,0,255)))
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painter.drawRect(retval)
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painter.end()
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return retval
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def _render_and_wrap_single_line(self, line, footer, tlcorner=(0,0)):
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"""
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Render a single line of words onto the DC, top left corner
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specified.
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If the line is too wide for the context, it wraps, but
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right-aligns the surplus words in the manner of song lyrics
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Returns the bottom-right corner (of what was rendered) as a tuple(x, y).
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"""
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x, y = tlcorner
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# We draw the text to see how big it is and then iterate to make it fit
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# when we line wrap we do in in the "lyrics" style, so the second line is
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# right aligned with a "hanging indent"
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words = line.split(u' ')
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thisline = u' '.join(words)
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lastword = len(words)
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lines = []
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maxx = self._rect.width();
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maxy = self._rect.height();
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while (len(words) > 0):
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w , h = self._get_extent_and_render(thisline, footer)
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rhs = w + x
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if rhs < maxx - self._right_margin:
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lines.append(thisline)
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words = words[lastword:]
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thisline = ' '.join(words)
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lastword = len(words)
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else:
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lastword -= 1
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thisline = ' '.join(words[:lastword])
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startx = x
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starty = y
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rightextent = None
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# dont allow alignment messing with footers
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if footer:
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align = 0
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else:
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align = int(self._theme .display_horizontalAlign)
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for linenum in range(len(lines)):
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line = lines[linenum]
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#find out how wide line is
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w , h = self._get_extent_and_render(line, footer, tlcorner=(x, y), draw=False)
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if self._theme.display_shadow:
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w += self._shadow_offset
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h += self._shadow_offset
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if self._theme.display_outline:
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# pixels either side
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w += 2 * self._outline_offset
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# pixels top/bottom
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h += 2 * self._outline_offset
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if align == 0: # left align
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rightextent = x + w
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# shift right from last line's rh edge
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if self._theme.display_wrapStyle == 1 and linenum != 0:
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rightextent = self._first_line_right_extent + self._right_margin
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if rightextent > maxx:
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rightextent = maxx
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x = rightextent - w
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# right align
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elif align == 1:
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rightextent = maxx
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x = maxx - w
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# centre
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elif align == 2:
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x = (maxx - w) / 2;
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rightextent = x + w
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# now draw the text, and any outlines/shadows
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if self._theme.display_shadow:
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self._get_extent_and_render(line, footer, tlcorner=(x+self._shadow_offset,y+self._shadow_offset),
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draw=True, color = self._theme.display_shadow_color)
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if self._theme.display_outline:
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self._get_extent_and_render(line, footer, (x+self._outline_offset,y), draw=True,
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color = self._theme.display_outline_color)
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self._get_extent_and_render(line, footer, (x, y+self._outline_offset), draw=True,
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color = self._theme.display_outline_color)
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self._get_extent_and_render(line, footer, (x, y-self._outline_offset), draw=True,
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color = self._theme.display_outline_color)
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self._get_extent_and_render(line, footer, (x-self._outline_offset,y), draw=True,
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color = self._theme.display_outline_color)
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if self._outline_offset > 1:
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self._get_extent_and_render(line, footer, (x+self._outline_offset,y+self._outline_offset), draw=True,
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color = self._theme.display_outline_color)
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self._get_extent_and_render(line, footer, (x-self._outline_offset,y+self._outline_offset), draw=True,
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color = self._theme.display_outline_color)
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self._get_extent_and_render(line, footer, (x+self._outline_offset,y-self._outline_offset), draw=True,
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color = self._theme.display_outline_color)
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self._get_extent_and_render(line, footer, (x-self._outline_offset,y-self._outline_offset), draw=True,
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color = self._theme.display_outline_color)
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self._get_extent_and_render(line, footer,tlcorner=(x, y), draw=True)
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y += h
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if linenum == 0:
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self._first_line_right_extent = rightextent
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# draw a box around the text - debug only
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if self._debug:
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painter = QtGui.QPainter()
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painter.begin(self._frame)
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painter.setPen(QtGui.QPen(QtGui.QColor(0,255,0)))
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painter.drawRect(startx , starty , rightextent-startx , y-starty)
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painter.end()
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brcorner = (rightextent , y)
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return brcorner
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def _set_theme_font(self):
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self.footerFont = QtGui.QFont(self._theme.font_footer_name,
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int(self._theme.font_footer_proportion), # size
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QtGui.QFont.Normal, # weight
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0)# italic
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self.footerFont.setPixelSize(int(self._theme.font_footer_proportion))
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self.mainFont = QtGui.QFont(self._theme.font_main_name,
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int(self._theme.font_main_proportion), # size
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QtGui.QFont.Normal, # weight
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0)# italic
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self.mainFont.setPixelSize(int(self._theme.font_main_proportion))
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def _get_extent_and_render(self, line, footer, tlcorner=(0,0), draw=False, color=None):
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"""
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Find bounding box of text - as render_single_line.
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If draw is set, actually draw the text to the current DC as well
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return width and height of text as a tuple (w,h)
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"""
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# setup defaults
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painter = QtGui.QPainter()
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painter.begin(self._frame)
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# 'twould be more efficient to set this once when theme changes
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# or p changes
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if footer :
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font = self.footerFont
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else:
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font = self.mainFont
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painter.setFont(font)
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if color == None:
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if footer:
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painter.setPen(QtGui.QColor(self._theme.font_footer_color))
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else:
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painter.setPen(QtGui.QColor(self._theme.font_main_color))
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else:
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painter.setPen(QtGui.QColor(color))
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x, y = tlcorner
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metrics = QtGui.QFontMetrics(font)
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# xxx some fudges to make it exactly like wx! Take 'em out later
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w = metrics.width(line)
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h = metrics.height() - 2
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if draw:
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painter.drawText(x, y + metrics.ascent() , line)
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painter.end()
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return (w, h)
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def snoop_Image(self, image, image2=None):
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"""
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Debugging method to allow images to be viewed
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"""
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im = image.toImage()
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im.save(u'renderer.png', u'png')
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if image2 is not None:
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im = image2.toImage()
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im.save(u'renderer2.png', u'png')
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