Source code for psychopy.visual.image

#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""Display an image on `psycopy.visual.Window`"""

# Part of the PsychoPy library
# Copyright (C) 2002-2018 Jonathan Peirce (C) 2019-2024 Open Science Tools Ltd.
# Distributed under the terms of the GNU General Public License (GPL).

# Ensure setting pyglet.options['debug_gl'] to False is done prior to any
# other calls to pyglet or pyglet submodules, otherwise it may not get picked
# up by the pyglet GL engine and have no effect.
# Shaders will work but require OpenGL2.0 drivers AND PyOpenGL3.0+
import pyglet

from psychopy.layout import Size

pyglet.options['debug_gl'] = False
import ctypes
GL =

import numpy
from fractions import Fraction

import psychopy  # so we can get the __path__
from psychopy import logging, colors, layout

from import attributeSetter, setAttribute
from psychopy.visual.basevisual import (
    BaseVisualStim, DraggingMixin, ContainerMixin, ColorMixin, TextureMixin

[docs]class ImageStim(BaseVisualStim, DraggingMixin, ContainerMixin, ColorMixin, TextureMixin): """Display an image on a :class:`psychopy.visual.Window` """ def __init__(self, win, image=None, mask=None, units="", pos=(0.0, 0.0), size=None, anchor="center", ori=0.0, color=(1.0, 1.0, 1.0), colorSpace='rgb', contrast=1.0, opacity=None, depth=0, interpolate=False, draggable=False, flipHoriz=False, flipVert=False, texRes=128, name=None, autoLog=None, maskParams=None): """ """ # Empty docstring. All doc is in attributes # what local vars are defined (these are the init params) for use by # __repr__ self._initParams = dir() self._initParams.remove('self') super(ImageStim, self).__init__(win, units=units, name=name, autoLog=False) # set at end of init self.draggable = draggable # use shaders if available by default, this is a good thing self.__dict__['useShaders'] = win._haveShaders # initialise textures for stimulus self._texID = GL.GLuint() GL.glGenTextures(1, ctypes.byref(self._texID)) self._maskID = GL.GLuint() GL.glGenTextures(1, ctypes.byref(self._maskID)) self._pixbuffID = GL.GLuint() GL.glGenBuffers(1, ctypes.byref(self._pixbuffID)) self.__dict__['maskParams'] = maskParams self.__dict__['mask'] = mask # Not pretty (redefined later) but it works! self.__dict__['texRes'] = texRes # Other stuff self._imName = image self.isLumImage = None self.interpolate = interpolate self.vertices = None self.anchor = anchor self.flipHoriz = flipHoriz self.flipVert = flipVert self._requestedSize = size self._origSize = None # updated if an image texture gets loaded self.size = size self.pos = numpy.array(pos, float) self.ori = float(ori) self.depth = depth # color and contrast etc self.rgbPedestal = [0, 0, 0] # does an rgb pedestal make sense for an image? self.colorSpace = colorSpace # omit decorator self.color = color self.contrast = float(contrast) self.opacity = opacity # Set the image and mask- self.setImage(image, log=False) self.texRes = texRes # rebuilds the mask self.size = size # generate a displaylist ID self._listID = GL.glGenLists(1) self._updateList() # ie refresh display list # set autoLog now that params have been initialised wantLog = autoLog is None and self.__dict__['autoLog'] = autoLog or wantLog if self.autoLog: logging.exp("Created %s = %s" % (, str(self)))
[docs] def _updateListShaders(self): """ The user shouldn't need this method since it gets called after every call to .set() Basically it updates the OpenGL representation of your stimulus if some parameter of the stimulus changes. Call it if you change a property manually rather than using the .set() command """ self._needUpdate = False GL.glNewList(self._listID, GL.GL_COMPILE) # setup the shaderprogram if self.isLumImage: # for a luminance image do recoloring _prog = GL.glUseProgram(_prog) # set the texture to be texture unit 0 GL.glUniform1i(GL.glGetUniformLocation(_prog, b"texture"), 0) # mask is texture unit 1 GL.glUniform1i(GL.glGetUniformLocation(_prog, b"mask"), 1) else: # for an rgb image there is no recoloring _prog = GL.glUseProgram(_prog) # set the texture to be texture unit 0 GL.glUniform1i(GL.glGetUniformLocation(_prog, b"texture"), 0) # mask is texture unit 1 GL.glUniform1i(GL.glGetUniformLocation(_prog, b"mask"), 1) # mask GL.glActiveTexture(GL.GL_TEXTURE1) GL.glBindTexture(GL.GL_TEXTURE_2D, self._maskID) GL.glEnable(GL.GL_TEXTURE_2D) # implicitly disables 1D # main texture GL.glActiveTexture(GL.GL_TEXTURE0) GL.glBindTexture(GL.GL_TEXTURE_2D, self._texID) GL.glEnable(GL.GL_TEXTURE_2D) # access just once because it's slower than basic property vertsPix = self.verticesPix GL.glBegin(GL.GL_QUADS) # draw a 4 sided polygon # right bottom GL.glMultiTexCoord2f(GL.GL_TEXTURE0, 1, 0) GL.glMultiTexCoord2f(GL.GL_TEXTURE1, 1, 0) GL.glVertex2f(vertsPix[0, 0], vertsPix[0, 1]) # left bottom GL.glMultiTexCoord2f(GL.GL_TEXTURE0, 0, 0) GL.glMultiTexCoord2f(GL.GL_TEXTURE1, 0, 0) GL.glVertex2f(vertsPix[1, 0], vertsPix[1, 1]) # left top GL.glMultiTexCoord2f(GL.GL_TEXTURE0, 0, 1) GL.glMultiTexCoord2f(GL.GL_TEXTURE1, 0, 1) GL.glVertex2f(vertsPix[2, 0], vertsPix[2, 1]) # right top GL.glMultiTexCoord2f(GL.GL_TEXTURE0, 1, 1) GL.glMultiTexCoord2f(GL.GL_TEXTURE1, 1, 1) GL.glVertex2f(vertsPix[3, 0], vertsPix[3, 1]) GL.glEnd() # unbind the textures GL.glActiveTexture(GL.GL_TEXTURE1) GL.glBindTexture(GL.GL_TEXTURE_2D, 0) GL.glDisable(GL.GL_TEXTURE_2D) # implicitly disables 1D # main texture GL.glActiveTexture(GL.GL_TEXTURE0) GL.glBindTexture(GL.GL_TEXTURE_2D, 0) GL.glDisable(GL.GL_TEXTURE_2D) GL.glUseProgram(0) GL.glEndList()
def __del__(self): """Remove textures from graphics card to prevent crash """ try: if hasattr(self, '_listID'): GL.glDeleteLists(self._listID, 1) self.clearTextures() except (ImportError, ModuleNotFoundError, TypeError): pass # has probably been garbage-collected already
[docs] def draw(self, win=None): """Draw. """ # check the type of image we're dealing with if (type(self.image) != numpy.ndarray and self.image in (None, "None", "none")): return # make the context for the window current if win is None: win = self._selectWindow(win) # If our image is a movie stim object, pull pixel data from the most # recent frame and write it to the memory if hasattr(self.image, 'getVideoFrame'): videoFrame = self.image.getVideoFrame() if videoFrame is not None: self._movieFrameToTexture(videoFrame) GL.glPushMatrix() # push before the list, pop after win.setScale('pix') GL.glColor4f(*self._foreColor.render('rgba1')) if self._needTextureUpdate: self.setImage(value=self._imName, log=False) if self._needUpdate: self._updateList() GL.glCallList(self._listID) # return the view to previous state GL.glPopMatrix()
[docs] def _movieFrameToTexture(self, movieSrc): """Convert a movie frame to a texture and use it. This method is used internally to copy pixel data from a camera object into a texture. This enables the `ImageStim` to be used as a 'viewfinder' of sorts for the camera to view a live video stream on a window. Parameters ---------- movieSrc : `` Movie source object. """ # get the most recent video frame and extract color data colorData = movieSrc.colorData # get the size of the movie frame and compute the buffer size vidWidth, vidHeight = movieSrc.size nBufferBytes = vidWidth * vidHeight * 3 # bind pixel unpack buffer GL.glBindBuffer(GL.GL_PIXEL_UNPACK_BUFFER, self._pixbuffID) # Free last storage buffer before mapping and writing new frame # data. This allows the GPU to process the extant buffer in VRAM # uploaded last cycle without being stalled by the CPU accessing it. GL.glBufferData( GL.GL_PIXEL_UNPACK_BUFFER, nBufferBytes * ctypes.sizeof(GL.GLubyte), None, GL.GL_STREAM_DRAW) # Map the buffer to client memory, `GL_WRITE_ONLY` to tell the # driver to optimize for a one-way write operation if it can. bufferPtr = GL.glMapBuffer( GL.GL_PIXEL_UNPACK_BUFFER, GL.GL_WRITE_ONLY) bufferArray = numpy.ctypeslib.as_array( ctypes.cast(bufferPtr, ctypes.POINTER(GL.GLubyte)), shape=(nBufferBytes,)) # copy data bufferArray[:] = colorData[:] # Very important that we unmap the buffer data after copying, but # keep the buffer bound for setting the texture. GL.glUnmapBuffer(GL.GL_PIXEL_UNPACK_BUFFER) # bind the texture in OpenGL GL.glEnable(GL.GL_TEXTURE_2D) GL.glActiveTexture(GL.GL_TEXTURE0) GL.glBindTexture(GL.GL_TEXTURE_2D, self._texID) # copy the PBO to the texture GL.glPixelStorei(GL.GL_UNPACK_ALIGNMENT, 1) GL.glTexSubImage2D( GL.GL_TEXTURE_2D, 0, 0, 0, vidWidth, vidHeight, GL.GL_RGB, GL.GL_UNSIGNED_BYTE, 0) # point to the presently bound buffer # update texture filtering only if needed if self.interpolate: texFilter = GL.GL_LINEAR else: texFilter = GL.GL_NEAREST GL.glTexParameteri( GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, texFilter) GL.glTexParameteri( GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, texFilter) # important to unbind the PBO GL.glBindBuffer(GL.GL_PIXEL_UNPACK_BUFFER, 0) GL.glBindTexture(GL.GL_TEXTURE_2D, 0) GL.glDisable(GL.GL_TEXTURE_2D)
@attributeSetter def image(self, value): """The image file to be presented (most formats supported). This can be a path-like object to an image file, or a numpy array of shape [H, W, C] where C are channels. The third dim will usually have length 1 (defining an intensity-only image), 3 (defining an RGB image) or 4 (defining an RGBA image). If passing a numpy array to the image attribute, the size attribute of ImageStim must be set explicitly. """ self.__dict__['image'] = self._imName = value # If given a color array, get it in rgb1 if isinstance(value, colors.Color): value = value.render('rgb1') wasLumImage = self.isLumImage if type(value) != numpy.ndarray and value == "color": datatype = GL.GL_FLOAT else: datatype = GL.GL_UNSIGNED_BYTE if type(value) != numpy.ndarray and value in (None, "None", "none"): self.isLumImage = True else: self.isLumImage = self._createTexture( value, id=self._texID, stim=self, pixFormat=GL.GL_RGB, dataType=datatype, maskParams=self.maskParams, forcePOW2=False, wrapping=False) # update size self.size = self._requestedSize if hasattr(value, 'getVideoFrame'): # make sure we invert vertices self.flipVert = True # if we switched to/from lum image then need to update shader rule if wasLumImage != self.isLumImage: self._needUpdate = True self._needTextureUpdate = False
[docs] def setImage(self, value, log=None): """Usually you can use 'stim.attribute = value' syntax instead, but use this method if you need to suppress the log message. """ setAttribute(self, 'image', value, log)
@property def aspectRatio(self): """ Aspect ratio of original image, before taking into account the `.size` attribute of this object. returns : Aspect ratio as a (w, h) tuple, simplified using the smallest common denominator (e.g. 1080x720 pixels becomes (3, 2)) """ # Return None if we don't have a texture yet if (not hasattr(self, "_origSize")) or self._origSize is None: return # Work out aspect ratio (w/h) frac = Fraction(*self._origSize) return frac.numerator, frac.denominator @property def size(self): return BaseVisualStim.size.fget(self) @size.setter def size(self, value): # store requested size self._requestedSize = value isNone = numpy.asarray(value) == None if (self.aspectRatio is not None) and (isNone.any()) and (not isNone.all()): # If only one value is None, replace it with a value which maintains aspect ratio pix = layout.Size(value, units=self.units, # Replace None value with scaled pix value i = isNone.argmax() ni = isNone.argmin() pix[i] = pix[ni] * self.aspectRatio[i] / self.aspectRatio[ni] # Recreate layout object from pix value = layout.Size(pix, units="pix", elif (self.aspectRatio is not None) and (isNone.all()): # If both values are None, use pixel size value = layout.Size(self._origSize, units="pix", # Do base setting BaseVisualStim.size.fset(self, value) @attributeSetter def mask(self, value): """The alpha mask that can be used to control the outer shape of the stimulus + **None**, 'circle', 'gauss', 'raisedCos' + or the name of an image file (most formats supported) + or a numpy array (1xN or NxN) ranging -1:1 """ self.__dict__['mask'] = value self._createTexture(value, id=self._maskID, pixFormat=GL.GL_ALPHA, dataType=GL.GL_UNSIGNED_BYTE, stim=self, res=self.texRes, maskParams=self.maskParams, forcePOW2=False, wrapping=True)
[docs] def setMask(self, value, log=None): """Usually you can use 'stim.attribute = value' syntax instead, but use this method if you need to suppress the log message. """ setAttribute(self, 'mask', value, log)

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