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effects.py
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effects.py
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# Copyright (C) 2016 Russ Dill <russ.dill@gmail.com>
#
# 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, see <http://www.gnu.org/licenses/>.
from PyQt4 import Qt
import ctypes
import sip
_qtgui = ctypes.CDLL("libQtGui.so.4")
_qt_blurImage = _qtgui._Z12qt_blurImageP8QPainterR6QImagedbbi
def qt_blurImage(p, blurImage, radius, quality, alphaOnly, transposed=0):
p = ctypes.c_void_p(sip.unwrapinstance(p))
blurImage = ctypes.c_void_p(sip.unwrapinstance(blurImage))
radius = ctypes.c_double(radius)
quality = ctypes.c_bool(quality)
alphaOnly = ctypes.c_bool(alphaOnly)
transposed = ctypes.c_int(transposed)
_qt_blurImage(p, blurImage, radius, quality, alphaOnly, transposed)
class QGraphicsBlurShadowEffect(Qt.QGraphicsEffect):
def __init__(self, *args, **kwargs):
super(QGraphicsBlurShadowEffect, self).__init__(*args, **kwargs)
self._distance = 4.0
self._blurRadius = 10.0
self._color = Qt.QColor(0, 0, 0, 80)
@Qt.pyqtProperty(float)
def distance(self):
return self._distance
@distance.setter
def distance(self, value):
self._distance = value
@Qt.pyqtProperty(float)
def blurRadius(self):
return self._blurRadius
@blurRadius.setter
def blurRadius(self, value):
self._blurRadius = value
@Qt.pyqtProperty(Qt.QColor)
def color(self):
return self._color
@color.setter
def color(self, value):
self._color = value
def draw(self, painter):
# if nothing to show outside the item, just draw source
if (self.blurRadius + self.distance) <= 0:
drawSource(painter)
return
mode = Qt.QGraphicsEffect.PadToEffectiveBoundingRect
px, offset = self.sourcePixmap(Qt.Qt.DeviceCoordinates, mode)
# return if no source
if px.isNull():
return
# save world transform
restoreTransform = painter.worldTransform()
painter.setWorldTransform(Qt.QTransform())
# Calculate size for the background image
szi = Qt.QSize(px.size().width() + 2 * self.distance, px.size().height() + 2 * self.distance)
tmp = Qt.QImage(szi, Qt.QImage.Format_ARGB32_Premultiplied)
scaled = Qt.QPixmap(px.scaled(szi))
tmp.fill(0)
tmpPainter = Qt.QPainter(tmp)
tmpPainter.setCompositionMode(Qt.QPainter.CompositionMode_Source)
tmpPainter.drawPixmap(Qt.QPointF(-self.distance, -self.distance), scaled)
tmpPainter.end()
# blur the alpha channel
blurred = Qt.QImage(tmp.size(), Qt.QImage.Format_ARGB32_Premultiplied)
blurred.fill(0)
blurPainter = Qt.QPainter(blurred)
qt_blurImage(blurPainter, tmp, self.blurRadius, False, True)
blurPainter.end()
tmp = blurred
# blacken the image...
tmpPainter.begin(tmp)
tmpPainter.setCompositionMode(Qt.QPainter.CompositionMode_SourceIn)
tmpPainter.fillRect(tmp.rect(), self.color)
tmpPainter.end()
# draw the blurred shadow...
painter.drawImage(offset, tmp)
# draw the actual pixmap...
painter.drawPixmap(offset, px, Qt.QRectF())
# restore world transform
painter.setWorldTransform(restoreTransform)
def boundingRectFor(self, rect):
delta = self.blurRadius + self.distance
return rect.united(rect.adjusted(-delta, -delta, delta, delta))