1 files changed, 110 insertions, 0 deletions
diff --git a/Lib/plat-irix6/jpeg.py b/Lib/plat-irix6/jpeg.py
new file mode 100644
index 0000000..85d6d83
--- /dev/null
+++ b/Lib/plat-irix6/jpeg.py
@@ -0,0 +1,110 @@
+# Implement 'jpeg' interface using SGI's compression library
+
+# XXX Options 'smooth' and 'optimize' are ignored.
+
+# XXX It appears that compressing grayscale images doesn't work right;
+# XXX the resulting file causes weirdness.
+
+error = 'jpeg.error' # Exception
+
+options = {'quality': 75, 'optimize': 0, 'smooth': 0, 'forcegray': 0}
+
+comp = None
+decomp = None
+
+def compress(imgdata, width, height, bytesperpixel):
+	global comp
+	import cl, CL
+	if comp is None: comp = cl.OpenCompressor(CL.JPEG)
+	if bytesperpixel == 1:
+		format = CL.GRAYSCALE
+	elif bytesperpixel == 4:
+		format = CL.RGBX
+	if options['forcegray']:
+		iformat = CL.GRAYSCALE
+	else:
+		iformat = CL.YUV
+	# XXX How to support 'optimize'?
+	params = [CL.IMAGE_WIDTH, width, CL.IMAGE_HEIGHT, height, \
+		  CL.ORIGINAL_FORMAT, format, \
+		  CL.ORIENTATION, CL.BOTTOM_UP, \
+		  CL.QUALITY_FACTOR, options['quality'], \
+		  CL.INTERNAL_FORMAT, iformat, \
+		 ]
+	comp.SetParams(params)
+	jpegdata = comp.Compress(1, imgdata)
+	return jpegdata
+
+def decompress(jpegdata):
+	global decomp
+	import cl, CL
+	if decomp is None: decomp = cl.OpenDecompressor(CL.JPEG)
+	headersize = decomp.ReadHeader(jpegdata)
+	params = [CL.IMAGE_WIDTH, 0, CL.IMAGE_HEIGHT, 0, CL.INTERNAL_FORMAT, 0]
+	decomp.GetParams(params)
+	width, height, format = params[1], params[3], params[5]
+	if format == CL.GRAYSCALE or options['forcegray']:
+		format = CL.GRAYSCALE
+		bytesperpixel = 1
+	else:
+		format = CL.RGBX
+		bytesperpixel = 4
+	# XXX How to support 'smooth'?
+	params = [CL.ORIGINAL_FORMAT, format, \
+		  CL.ORIENTATION, CL.BOTTOM_UP, \
+		  CL.FRAME_BUFFER_SIZE, width*height*bytesperpixel]
+	decomp.SetParams(params)
+	imgdata = decomp.Decompress(1, jpegdata)
+	return imgdata, width, height, bytesperpixel
+
+def setoption(name, value):
+	if type(value) <> type(0):
+		raise TypeError, 'jpeg.setoption: numeric options only'
+	if name == 'forcegrey':
+		name = 'forcegray'
+	if not options.has_key(name):
+		raise KeyError, 'jpeg.setoption: unknown option name'
+	options[name] = int(value)
+
+def test():
+	import sys
+	if sys.argv[1:2] == ['-g']:
+		del sys.argv[1]
+		setoption('forcegray', 1)
+	if not sys.argv[1:]:
+		sys.argv.append('/usr/local/images/data/jpg/asterix.jpg')
+	for file in sys.argv[1:]:
+		show(file)
+
+def show(file):
+	import gl, GL, DEVICE
+	jpegdata = open(file, 'r').read()
+	imgdata, width, height, bytesperpixel = decompress(jpegdata)
+	gl.foreground()
+	gl.prefsize(width, height)
+	win = gl.winopen(file)
+	if bytesperpixel == 1:
+		gl.cmode()
+		gl.pixmode(GL.PM_SIZE, 8)
+		gl.gconfig()
+		for i in range(256):
+			gl.mapcolor(i, i, i, i)
+	else:
+		gl.RGBmode()
+		gl.pixmode(GL.PM_SIZE, 32)
+		gl.gconfig()
+	gl.qdevice(DEVICE.REDRAW)
+	gl.qdevice(DEVICE.ESCKEY)
+	gl.qdevice(DEVICE.WINQUIT)
+	gl.qdevice(DEVICE.WINSHUT)
+	gl.lrectwrite(0, 0, width-1, height-1, imgdata)
+	while 1:
+		dev, val = gl.qread()
+		if dev in (DEVICE.ESCKEY, DEVICE.WINSHUT, DEVICE.WINQUIT):
+			break
+		if dev == DEVICE.REDRAW:
+			gl.lrectwrite(0, 0, width-1, height-1, imgdata)
+	gl.winclose(win)
+	# Now test the compression and write the result to a fixed filename
+	newjpegdata = compress(imgdata, width, height, bytesperpixel)
+	open('/tmp/j.jpg', 'w').write(newjpegdata)