Simple DDS file loader ... load a DDS file as a QImage

fileDDS.py

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

__author__ = '[email protected]'

## reference:  https://gist.github.com/bjorn/4635382

# -- This line is 75 characters -------------------------------------------

# example code
#QImage readDDSFile(const QString &filename)
#{
    #QGLWidget glWidget;
    #glWidget.makeCurrent();
 
    #GLuint texture = glWidget.bindTexture(filename);
    #if (!texture)
        #return QImage();
 
    #// Determine the size of the DDS image
    #GLint width, height;
    #glBindTexture(GL_TEXTURE_2D, texture);
    #glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &width);
    #glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &height);
 
    #if (width == 0 || height == 0)
        #return QImage();
 
    #QGLPixelBuffer pbuffer(QSize(width, height), glWidget.format(), &glWidget);
    #if (!pbuffer.makeCurrent())
        #return QImage();
 
    #pbuffer.drawTexture(QRectF(-1, -1, 2, 2), texture);
    #return pbuffer.toImage();
#}

#from PySide import QtGui, QtCore

import os, sys

from OpenGL.GL import *

#import numpy as np

from PySide.QtOpenGL import *
from PySide.QtGui import *
from PySide.QtCore import *

# global debug config set up
global gDebug
from bp_config.debugConfig import gDebug, setDebug

# my path convenience class, should be easy to remove/replace
from bp_files.bp_path import Path

###########################################################################
## 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 = Path(filePath)
            self._qImage = self.readDDSFile(self._filePath)
        
    # --method-------------------------------------------------------------
    def readDDSFile(self, filePath=None):
        
        glWidget = QGLWidget()
        glWidget.makeCurrent()
        
        texture = glWidget.bindTexture(filePath)
        if not texture:
            return 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 gDebug:
            print 'Image W/H:: {0}, {1}'.format(self._width, self._height)
     
        if self._width == 0 and self._height == 0:
            return QImage()
     
        pbuffer = QGLPixelBuffer(QSize(self._width, self._height), glWidget.format())
        if not pbuffer.makeCurrent():
            return QImage()
     
        pbuffer.drawTexture(QRectF(-1, -1, 2, 2), texture)
        return pbuffer.toImage()
    
    
###########################################################################
# --call block-------------------------------------------------------------
if __name__ == "__main__":
    '''Allows the script to be run as main()'''
    global gDebug
    gDebug = setDebug(True)
    
    from bp_files.bp_path import Path  # path convenience class
    
    global myApp
    myApp = QApplication(sys.argv)
    myApp.setStyle('Plastique')
    
    testPath = Path(r'testDDS.dds')
    
    image = fileDDS(testPath)._qImage
    
    # Should get back a QImage
    print image
    
    sys.exit(myApp.exec_())