loading a DDS file into a QImage for display in PyQt

[Benjam901]

Hello all,

I am having some trouble loading a dds file into PyQt for displaying in a window. 

I have dug around and I keep being pointed towards OpenGL.GL and QtOpenGL. I found a function on tech artists forum http://tech-artists.org/forum/showthread.php?5196-Simple-DDS-loader that supposedly returns a Qimage from a dds filepath but when the function tries to bind the texture it fails instantly or returns 0. Am I missing a step before trying to bind the image?

I have also tried a custom fucntion earlier using QtOpenGL but I have had no luck so far

There doesn't seem to be a huge amount of info out there on this so hopefully someone on here can help shine a light!

The code is below to ilustrate my issue:

import os
	import sys
	from PyQt4 import QtGui, QtCore
	from PyQt4.QtOpenGL import *
	from OpenGL.GL import *
	class ShaderCoordWindow(QtGui.QDialog):
	def __init__(self):
	QtGui.QDialog.__init__(self)
	global coordWindow
	coordWindow = QtGui.QDialog()
	coordWindow.resize(512, 512)
	coordWindow.setWindowTitle("Objects to skin")
	coordWindow.setWindowFlags(QtCore.Qt.WindowStaysOnTopHint)
	testDDS = r'D:\\test.dds'
	testJPG = r'D:\\test_jpg.jpg'
	jpgPixMap = QtGui.QPixmap(testJPG)
	qFileDDS = fileDDS(testDDS)
	testImg = QtGui.QPixmap.fromImage(qFileDDS._qImage)
	imageLabel = QtGui.QLabel(coordWindow)
	imageLabel.setPixmap(testImg)
	layout = QtGui.QHBoxLayout()
	layout.addWidget(imageLabel)
	coordWindow.setLayout(layout)
	coordWindow.show()
	###########################################################################
	## DDS file reader
	class fileDDS(object):
	"""This class represnts a generic DDS file as a QImage"""
	#global gDebug
	# --BASE-METHODS-------------------------------------------------------
	# --constructor-
	def __init__(self, filePath=None):
	self._filePath = None
	self._width = int(0)
	self._height = int(0)
	self._qImage = None
	if filePath != None:
	self._filePath = filePath
	self._qImage = self.readDDSFile(self._filePath)
	# --method-------------------------------------------------------------
	def readDDSFile(self, filePath=None):
	print 'reading', filePath
	glWidget = QGLWidget()
	glWidget.makeCurrent()
	texture = glWidget.bindTexture(QtCore.QString(filePath))
	if not texture:
	print 'not textures'
	return QtGui.QImage()
	# Determine the size of the DDS image
	glBindTexture(GL_TEXTURE_2D, texture)
	self._width = glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH)
	self._height = glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT)
	if self._width == 0 and self._height == 0:
	print 'width and height nothing'
	return QtGui.QImage()
	pbuffer = QGLPixelBuffer(QtCore.QSize(self._width, self._height), glWidget.format())
	if not pbuffer.makeCurrent():
	print 'no pbuffer'
	return QtGui.QImage()
	pbuffer.drawTexture(QtCore.QRectF(-1, -1, 2, 2), texture)
	return pbuffer.toImage()
	def run():
	app = QtGui.QApplication(sys.argv)
	ShaderCoordWindow()
	sys.exit(app.exec_())
	run()

[Benjam901]

UPDATE:

I shortened the function for readibility but I am still displaying nothing but blank on my qt window. My IDE prompts me that I am missing a QImage on this line QtGui.QPixmap.fromImage(img)which is odd sicne I am passing something into it and calling it straight from QtGui Module. I can't help but think I am missing something?

def returnPixMap(self, ddsPath):
	glWidget = QGLWidget()
	glWidget.makeCurrent()
	texture = glWidget.bindTexture(ddsPath)
	width = -1
	height = -1
	glBindTexture(GL_TEXTURE_2D, texture)
	width = glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH)
	height = glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT)
	pbuffer = QGLPixelBuffer(QtCore.QSize(width, height), glWidget.format())

pbuffer.drawTexture(QtCore.QRectF(-1, -1, 2, 2), texture)

	img = pbuffer.toImage()
	return QtGui.QPixmap.fromImage(img)

...

[damon shelton]

try this

QtGui.QPixmap.fromImage(QtGui.QImage(img))

see if it fixes your issue.

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[Ben Hearn]

Hello Damon,

No dice on that one I am afraid. img is already a QImage since I got it from pbuffer.toImage() I have implemented it however but no luck. I am going to try and run a conversion under the hood and if it isn't too slow speed wise I may stick with that solution. I would very much like to be able to manipulate DDS image data though, have you managed to solve something like this before?

-- Ben

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[Benjam901]

[SOLVED]

Hello all,

I have found a way to display this and I have posted the solution below.

Unfortunately I did not find a way to actually display the DDS file so I had to run a convert under the hood using Image Magick (great tool).

I then ran the TGA file image through the rungs of formatting the data to generate a pixmap.

Anyway here are the functions I used to help my situation. I hope it helps some people!!

CODE:

def convertDDS(self, ddsPath='', imageMagickDir='', overlay=False):
	""" Convert the DDS files passed in to a tga file """
	convert = imageMagickDir+'\\convert'
	if overlay:
		tempOutPath = r'D:\\magickOverlayOut.tga'
	else:
		tempOutPath = r'D:\\magickOut.tga'
	subprocess.call([convert, ddsPath, tempOutPath])
	return tempOutPath

def returnQPixmapFromImage(self, inputPath='', overlayPath=''):
	# We turn out input paths into ImageQt objects for Qt to use later
	inImg = Image.open(inputPath)
	inputImg = ImageQt.ImageQt(inImg)
	overImg = Image.open(overlayPath)
	overlayImage = ImageQt.ImageQt(overImg)

	# Creating the input image into a QPixmap
	pix = QtGui.QPixmap.fromImage(inputImg)
	pix = pix.scaled(512, 512, QtCore.Qt.KeepAspectRatioByExpanding)
	pixHeight = round(pix.size().height(), 2)
	pixWidth = round(pix.size().width(), 2)

	# Creating the overlay images
	overlayPix = QtGui.QPixmap.fromImage(overlayImage)
	overlayImage = QtGui.QPixmap.toImage(overlayPix)
	overlayImage = overlayImage.scaled(pix.size(), QtCore.Qt.KeepAspectRatio)

	# Check the image has an alpha channel so we can remove it for preview
	if pix.hasAlpha():
		qtFormat = QtGui.QImage.Format_RGB32
	else:
		# We need this for DXT1's/TGA's without an alpha. For some reason it crashes the app
		qtFormat = QtGui.QImage.Format_ARGB32

	# Converting to QImage and removing the alpha then back to pixmap again
	stripAlpha = QtGui.QPixmap.toImage(pix).convertToFormat(qtFormat)
	myQImg = stripAlpha

	painter = QtGui.QPainter()
	painter.begin(myQImg)
	painter.drawImage(0, 0, overlayImage)
	painter.end()

	finalImage = QtGui.QPixmap.fromImage(myQImg)

	return finalImage, pixHeight, pixWidth

On Monday, 17 August 2015 15:26:49 UTC+2, Benjam901 wrote:

...