141 lines
5.3 KiB
Python
141 lines
5.3 KiB
Python
from ..Qt import QtCore, QtGui
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try:
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from ..Qt import QtOpenGL
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from OpenGL.GL import *
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HAVE_OPENGL = True
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except ImportError:
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HAVE_OPENGL = False
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from .. import functions as fn
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import numpy as np
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class RawImageWidget(QtGui.QWidget):
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"""
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Widget optimized for very fast video display.
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Generally using an ImageItem inside GraphicsView is fast enough.
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On some systems this may provide faster video. See the VideoSpeedTest example for benchmarking.
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"""
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def __init__(self, parent=None, scaled=False):
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"""
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Setting scaled=True will cause the entire image to be displayed within the boundaries of the widget. This also greatly reduces the speed at which it will draw frames.
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"""
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QtGui.QWidget.__init__(self, parent=None)
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self.setSizePolicy(QtGui.QSizePolicy(QtGui.QSizePolicy.Expanding,QtGui.QSizePolicy.Expanding))
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self.scaled = scaled
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self.opts = None
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self.image = None
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def setImage(self, img, *args, **kargs):
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"""
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img must be ndarray of shape (x,y), (x,y,3), or (x,y,4).
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Extra arguments are sent to functions.makeARGB
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"""
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self.opts = (img, args, kargs)
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self.image = None
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self.update()
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def paintEvent(self, ev):
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if self.opts is None:
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return
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if self.image is None:
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argb, alpha = fn.makeARGB(self.opts[0], *self.opts[1], **self.opts[2])
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self.image = fn.makeQImage(argb, alpha)
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self.opts = ()
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#if self.pixmap is None:
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#self.pixmap = QtGui.QPixmap.fromImage(self.image)
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p = QtGui.QPainter(self)
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if self.scaled:
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rect = self.rect()
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ar = rect.width() / float(rect.height())
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imar = self.image.width() / float(self.image.height())
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if ar > imar:
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rect.setWidth(int(rect.width() * imar/ar))
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else:
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rect.setHeight(int(rect.height() * ar/imar))
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p.drawImage(rect, self.image)
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else:
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p.drawImage(QtCore.QPointF(), self.image)
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#p.drawPixmap(self.rect(), self.pixmap)
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p.end()
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if HAVE_OPENGL:
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class RawImageGLWidget(QtOpenGL.QGLWidget):
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"""
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Similar to RawImageWidget, but uses a GL widget to do all drawing.
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Perfomance varies between platforms; see examples/VideoSpeedTest for benchmarking.
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"""
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def __init__(self, parent=None, scaled=False):
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QtOpenGL.QGLWidget.__init__(self, parent=None)
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self.scaled = scaled
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self.image = None
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self.uploaded = False
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self.smooth = False
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self.opts = None
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def setImage(self, img, *args, **kargs):
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"""
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img must be ndarray of shape (x,y), (x,y,3), or (x,y,4).
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Extra arguments are sent to functions.makeARGB
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"""
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self.opts = (img, args, kargs)
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self.image = None
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self.uploaded = False
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self.update()
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def initializeGL(self):
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self.texture = glGenTextures(1)
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def uploadTexture(self):
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glEnable(GL_TEXTURE_2D)
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glBindTexture(GL_TEXTURE_2D, self.texture)
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if self.smooth:
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
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else:
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST)
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST)
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER)
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER)
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#glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_BORDER)
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shape = self.image.shape
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### Test texture dimensions first
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#glTexImage2D(GL_PROXY_TEXTURE_2D, 0, GL_RGBA, shape[0], shape[1], 0, GL_RGBA, GL_UNSIGNED_BYTE, None)
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#if glGetTexLevelParameteriv(GL_PROXY_TEXTURE_2D, 0, GL_TEXTURE_WIDTH) == 0:
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#raise Exception("OpenGL failed to create 2D texture (%dx%d); too large for this hardware." % shape[:2])
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, shape[0], shape[1], 0, GL_RGBA, GL_UNSIGNED_BYTE, self.image.transpose((1,0,2)))
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glDisable(GL_TEXTURE_2D)
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def paintGL(self):
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if self.image is None:
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if self.opts is None:
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return
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img, args, kwds = self.opts
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kwds['useRGBA'] = True
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self.image, alpha = fn.makeARGB(img, *args, **kwds)
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if not self.uploaded:
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self.uploadTexture()
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glViewport(0, 0, self.width(), self.height())
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glEnable(GL_TEXTURE_2D)
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glBindTexture(GL_TEXTURE_2D, self.texture)
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glColor4f(1,1,1,1)
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glBegin(GL_QUADS)
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glTexCoord2f(0,0)
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glVertex3f(-1,-1,0)
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glTexCoord2f(1,0)
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glVertex3f(1, -1, 0)
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glTexCoord2f(1,1)
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glVertex3f(1, 1, 0)
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glTexCoord2f(0,1)
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glVertex3f(-1, 1, 0)
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glEnd()
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glDisable(GL_TEXTURE_3D)
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