diff options
Diffstat (limited to 'PIL/JpegImagePlugin.py')
| -rw-r--r-- | PIL/JpegImagePlugin.py | 430 |
1 files changed, 0 insertions, 430 deletions
diff --git a/PIL/JpegImagePlugin.py b/PIL/JpegImagePlugin.py deleted file mode 100644 index b8ba8e4..0000000 --- a/PIL/JpegImagePlugin.py +++ /dev/null @@ -1,430 +0,0 @@ -# -# The Python Imaging Library. -# $Id: JpegImagePlugin.py 2763 2006-06-22 21:43:28Z fredrik $ -# -# JPEG (JFIF) file handling -# -# See "Digital Compression and Coding of Continous-Tone Still Images, -# Part 1, Requirements and Guidelines" (CCITT T.81 / ISO 10918-1) -# -# History: -# 1995-09-09 fl Created -# 1995-09-13 fl Added full parser -# 1996-03-25 fl Added hack to use the IJG command line utilities -# 1996-05-05 fl Workaround Photoshop 2.5 CMYK polarity bug -# 1996-05-28 fl Added draft support, JFIF version (0.1) -# 1996-12-30 fl Added encoder options, added progression property (0.2) -# 1997-08-27 fl Save mode 1 images as BW (0.3) -# 1998-07-12 fl Added YCbCr to draft and save methods (0.4) -# 1998-10-19 fl Don't hang on files using 16-bit DQT's (0.4.1) -# 2001-04-16 fl Extract DPI settings from JFIF files (0.4.2) -# 2002-07-01 fl Skip pad bytes before markers; identify Exif files (0.4.3) -# 2003-04-25 fl Added experimental EXIF decoder (0.5) -# 2003-06-06 fl Added experimental EXIF GPSinfo decoder -# 2003-09-13 fl Extract COM markers -# -# Copyright (c) 1997-2003 by Secret Labs AB. -# Copyright (c) 1995-1996 by Fredrik Lundh. -# -# See the README file for information on usage and redistribution. -# - -__version__ = "0.5" - -import array, string -import Image, ImageFile - -def i16(c,o=0): - return ord(c[o+1]) + (ord(c[o])<<8) - -def i32(c,o=0): - return ord(c[o+3]) + (ord(c[o+2])<<8) + (ord(c[o+1])<<16) + (ord(c[o])<<24) - -# -# Parser - -def Skip(self, marker): - n = i16(self.fp.read(2))-2 - ImageFile._safe_read(self.fp, n) - -def APP(self, marker): - # - # Application marker. Store these in the APP dictionary. - # Also look for well-known application markers. - - n = i16(self.fp.read(2))-2 - s = ImageFile._safe_read(self.fp, n) - - app = "APP%d" % (marker&15) - - self.app[app] = s # compatibility - self.applist.append((app, s)) - - if marker == 0xFFE0 and s[:4] == "JFIF": - # extract JFIF information - self.info["jfif"] = version = i16(s, 5) # version - self.info["jfif_version"] = divmod(version, 256) - # extract JFIF properties - try: - jfif_unit = ord(s[7]) - jfif_density = i16(s, 8), i16(s, 10) - except: - pass - else: - if jfif_unit == 1: - self.info["dpi"] = jfif_density - self.info["jfif_unit"] = jfif_unit - self.info["jfif_density"] = jfif_density - elif marker == 0xFFE1 and s[:5] == "Exif\0": - # extract Exif information (incomplete) - self.info["exif"] = s # FIXME: value will change - elif marker == 0xFFE2 and s[:5] == "FPXR\0": - # extract FlashPix information (incomplete) - self.info["flashpix"] = s # FIXME: value will change - elif marker == 0xFFEE and s[:5] == "Adobe": - self.info["adobe"] = i16(s, 5) - # extract Adobe custom properties - try: - adobe_transform = ord(s[1]) - except: - pass - else: - self.info["adobe_transform"] = adobe_transform - -def COM(self, marker): - # - # Comment marker. Store these in the APP dictionary. - - n = i16(self.fp.read(2))-2 - s = ImageFile._safe_read(self.fp, n) - - self.app["COM"] = s # compatibility - self.applist.append(("COM", s)) - -def SOF(self, marker): - # - # Start of frame marker. Defines the size and mode of the - # image. JPEG is colour blind, so we use some simple - # heuristics to map the number of layers to an appropriate - # mode. Note that this could be made a bit brighter, by - # looking for JFIF and Adobe APP markers. - - n = i16(self.fp.read(2))-2 - s = ImageFile._safe_read(self.fp, n) - self.size = i16(s[3:]), i16(s[1:]) - - self.bits = ord(s[0]) - if self.bits != 8: - raise SyntaxError("cannot handle %d-bit layers" % self.bits) - - self.layers = ord(s[5]) - if self.layers == 1: - self.mode = "L" - elif self.layers == 3: - self.mode = "RGB" - elif self.layers == 4: - self.mode = "CMYK" - else: - raise SyntaxError("cannot handle %d-layer images" % self.layers) - - if marker in [0xFFC2, 0xFFC6, 0xFFCA, 0xFFCE]: - self.info["progression"] = 1 - - for i in range(6, len(s), 3): - t = s[i:i+3] - # 4-tuples: id, vsamp, hsamp, qtable - self.layer.append((t[0], ord(t[1])/16, ord(t[1])&15, ord(t[2]))) - -def DQT(self, marker): - # - # Define quantization table. Support baseline 8-bit tables - # only. Note that there might be more than one table in - # each marker. - - # FIXME: The quantization tables can be used to estimate the - # compression quality. - - n = i16(self.fp.read(2))-2 - s = ImageFile._safe_read(self.fp, n) - while len(s): - if len(s) < 65: - raise SyntaxError("bad quantization table marker") - v = ord(s[0]) - if v/16 == 0: - self.quantization[v&15] = array.array("b", s[1:65]) - s = s[65:] - else: - return # FIXME: add code to read 16-bit tables! - # raise SyntaxError, "bad quantization table element size" - - -# -# JPEG marker table - -MARKER = { - 0xFFC0: ("SOF0", "Baseline DCT", SOF), - 0xFFC1: ("SOF1", "Extended Sequential DCT", SOF), - 0xFFC2: ("SOF2", "Progressive DCT", SOF), - 0xFFC3: ("SOF3", "Spatial lossless", SOF), - 0xFFC4: ("DHT", "Define Huffman table", Skip), - 0xFFC5: ("SOF5", "Differential sequential DCT", SOF), - 0xFFC6: ("SOF6", "Differential progressive DCT", SOF), - 0xFFC7: ("SOF7", "Differential spatial", SOF), - 0xFFC8: ("JPG", "Extension", None), - 0xFFC9: ("SOF9", "Extended sequential DCT (AC)", SOF), - 0xFFCA: ("SOF10", "Progressive DCT (AC)", SOF), - 0xFFCB: ("SOF11", "Spatial lossless DCT (AC)", SOF), - 0xFFCC: ("DAC", "Define arithmetic coding conditioning", Skip), - 0xFFCD: ("SOF13", "Differential sequential DCT (AC)", SOF), - 0xFFCE: ("SOF14", "Differential progressive DCT (AC)", SOF), - 0xFFCF: ("SOF15", "Differential spatial (AC)", SOF), - 0xFFD0: ("RST0", "Restart 0", None), - 0xFFD1: ("RST1", "Restart 1", None), - 0xFFD2: ("RST2", "Restart 2", None), - 0xFFD3: ("RST3", "Restart 3", None), - 0xFFD4: ("RST4", "Restart 4", None), - 0xFFD5: ("RST5", "Restart 5", None), - 0xFFD6: ("RST6", "Restart 6", None), - 0xFFD7: ("RST7", "Restart 7", None), - 0xFFD8: ("SOI", "Start of image", None), - 0xFFD9: ("EOI", "End of image", None), - 0xFFDA: ("SOS", "Start of scan", Skip), - 0xFFDB: ("DQT", "Define quantization table", DQT), - 0xFFDC: ("DNL", "Define number of lines", Skip), - 0xFFDD: ("DRI", "Define restart interval", Skip), - 0xFFDE: ("DHP", "Define hierarchical progression", SOF), - 0xFFDF: ("EXP", "Expand reference component", Skip), - 0xFFE0: ("APP0", "Application segment 0", APP), - 0xFFE1: ("APP1", "Application segment 1", APP), - 0xFFE2: ("APP2", "Application segment 2", APP), - 0xFFE3: ("APP3", "Application segment 3", APP), - 0xFFE4: ("APP4", "Application segment 4", APP), - 0xFFE5: ("APP5", "Application segment 5", APP), - 0xFFE6: ("APP6", "Application segment 6", APP), - 0xFFE7: ("APP7", "Application segment 7", APP), - 0xFFE8: ("APP8", "Application segment 8", APP), - 0xFFE9: ("APP9", "Application segment 9", APP), - 0xFFEA: ("APP10", "Application segment 10", APP), - 0xFFEB: ("APP11", "Application segment 11", APP), - 0xFFEC: ("APP12", "Application segment 12", APP), - 0xFFED: ("APP13", "Application segment 13", APP), - 0xFFEE: ("APP14", "Application segment 14", APP), - 0xFFEF: ("APP15", "Application segment 15", APP), - 0xFFF0: ("JPG0", "Extension 0", None), - 0xFFF1: ("JPG1", "Extension 1", None), - 0xFFF2: ("JPG2", "Extension 2", None), - 0xFFF3: ("JPG3", "Extension 3", None), - 0xFFF4: ("JPG4", "Extension 4", None), - 0xFFF5: ("JPG5", "Extension 5", None), - 0xFFF6: ("JPG6", "Extension 6", None), - 0xFFF7: ("JPG7", "Extension 7", None), - 0xFFF8: ("JPG8", "Extension 8", None), - 0xFFF9: ("JPG9", "Extension 9", None), - 0xFFFA: ("JPG10", "Extension 10", None), - 0xFFFB: ("JPG11", "Extension 11", None), - 0xFFFC: ("JPG12", "Extension 12", None), - 0xFFFD: ("JPG13", "Extension 13", None), - 0xFFFE: ("COM", "Comment", COM) -} - - -def _accept(prefix): - return prefix[0] == "\377" - -## -# Image plugin for JPEG and JFIF images. - -class JpegImageFile(ImageFile.ImageFile): - - format = "JPEG" - format_description = "JPEG (ISO 10918)" - - def _open(self): - - s = self.fp.read(1) - - if ord(s[0]) != 255: - raise SyntaxError("not a JPEG file") - - # Create attributes - self.bits = self.layers = 0 - - # JPEG specifics (internal) - self.layer = [] - self.huffman_dc = {} - self.huffman_ac = {} - self.quantization = {} - self.app = {} # compatibility - self.applist = [] - - while 1: - - s = s + self.fp.read(1) - - i = i16(s) - - if MARKER.has_key(i): - name, description, handler = MARKER[i] - # print hex(i), name, description - if handler is not None: - handler(self, i) - if i == 0xFFDA: # start of scan - rawmode = self.mode - if self.mode == "CMYK": - rawmode = "CMYK;I" - self.tile = [("jpeg", (0,0) + self.size, 0, (rawmode, ""))] - # self.__offset = self.fp.tell() - break - s = self.fp.read(1) - elif i == 0 or i == 65535: - # padded marker or junk; move on - s = "\xff" - else: - raise SyntaxError("no marker found") - - def draft(self, mode, size): - - if len(self.tile) != 1: - return - - d, e, o, a = self.tile[0] - scale = 0 - - if a[0] == "RGB" and mode in ["L", "YCbCr"]: - self.mode = mode - a = mode, "" - - if size: - scale = max(self.size[0] / size[0], self.size[1] / size[1]) - for s in [8, 4, 2, 1]: - if scale >= s: - break - e = e[0], e[1], (e[2]-e[0]+s-1)/s+e[0], (e[3]-e[1]+s-1)/s+e[1] - self.size = ((self.size[0]+s-1)/s, (self.size[1]+s-1)/s) - scale = s - - self.tile = [(d, e, o, a)] - self.decoderconfig = (scale, 1) - - return self - - def load_djpeg(self): - - # ALTERNATIVE: handle JPEGs via the IJG command line utilities - - import tempfile, os - file = tempfile.mktemp() - os.system("djpeg %s >%s" % (self.filename, file)) - - try: - self.im = Image.core.open_ppm(file) - finally: - try: os.unlink(file) - except: pass - - self.mode = self.im.mode - self.size = self.im.size - - self.tile = [] - - def _getexif(self): - # Extract EXIF information. This method is highly experimental, - # and is likely to be replaced with something better in a future - # version. - import TiffImagePlugin, StringIO - def fixup(value): - if len(value) == 1: - return value[0] - return value - # The EXIF record consists of a TIFF file embedded in a JPEG - # application marker (!). - try: - data = self.info["exif"] - except KeyError: - return None - file = StringIO.StringIO(data[6:]) - head = file.read(8) - exif = {} - # process dictionary - info = TiffImagePlugin.ImageFileDirectory(head) - info.load(file) - for key, value in info.items(): - exif[key] = fixup(value) - # get exif extension - file.seek(exif[0x8769]) - info = TiffImagePlugin.ImageFileDirectory(head) - info.load(file) - for key, value in info.items(): - exif[key] = fixup(value) - # get gpsinfo extension - try: - file.seek(exif[0x8825]) - except KeyError: - pass - else: - info = TiffImagePlugin.ImageFileDirectory(head) - info.load(file) - exif[0x8825] = gps = {} - for key, value in info.items(): - gps[key] = fixup(value) - return exif - -# -------------------------------------------------------------------- -# stuff to save JPEG files - -RAWMODE = { - "1": "L", - "L": "L", - "RGB": "RGB", - "RGBA": "RGB", - "RGBX": "RGB", - "CMYK": "CMYK;I", - "YCbCr": "YCbCr", -} - -def _save(im, fp, filename): - - try: - rawmode = RAWMODE[im.mode] - except KeyError: - raise IOError("cannot write mode %s as JPEG" % im.mode) - - info = im.encoderinfo - - dpi = info.get("dpi", (0, 0)) - - # get keyword arguments - im.encoderconfig = ( - info.get("quality", 0), - # "progressive" is the official name, but older documentation - # says "progression" - # FIXME: issue a warning if the wrong form is used (post-1.1.5) - info.has_key("progressive") or info.has_key("progression"), - info.get("smooth", 0), - info.has_key("optimize"), - info.get("streamtype", 0), - dpi[0], dpi[1] - ) - - ImageFile._save(im, fp, [("jpeg", (0,0)+im.size, 0, rawmode)]) - -def _save_cjpeg(im, fp, filename): - # ALTERNATIVE: handle JPEGs via the IJG command line utilities. - import os - file = im._dump() - os.system("cjpeg %s >%s" % (file, filename)) - try: os.unlink(file) - except: pass - -# -------------------------------------------------------------------q- -# Registry stuff - -Image.register_open("JPEG", JpegImageFile, _accept) -Image.register_save("JPEG", _save) - -Image.register_extension("JPEG", ".jfif") -Image.register_extension("JPEG", ".jpe") -Image.register_extension("JPEG", ".jpg") -Image.register_extension("JPEG", ".jpeg") - -Image.register_mime("JPEG", "image/jpeg") |