def _pdf_image(self, psem): with TemporaryDirectory(prefix="djpdf-") as temp_dir: # JBIG2Globals are only used in symbol mode # In symbol mode jbig2 writes output to files otherwise # it's written to stdout symbol_mode = self.jbig2_threshold != 1 images_with_shared_globals = [] if symbol_mode and SHARE_JBIG2_GLOBALS: # Find all Jbig2Images that share the same symbol directory for obj in self._factory._cache: if (isinstance(obj, Jbig2Image) and self.compression == obj.compression and self.jbig2_threshold == obj.jbig2_threshold): images_with_shared_globals.append(obj) else: # The symbol directory is not shared with other Jbig2Images images_with_shared_globals.append(self) # Promise all handled Jbig2Images the finished image image_futures = [] my_image_future = None for image in images_with_shared_globals: future = asyncio.Future() asyncio.ensure_future(image._cache.get(future)) image_futures.append(future) if image is self: my_image_future = future # All futures are in place, the lock can be released self._factory._cache_lock.release() self._cache_lock_acquired = False # Prepare everything in parallel @asyncio.coroutine def get_jbig2_images(psem): # Convert images with ImageMagick to bitonal png in parallel yield from asyncio.gather(*[ run_command_async([ CONVERT_CMD, "-alpha", "remove", "-alpha", "off", "-colorspace", "gray", "-threshold", "50%", path.abspath(image.filename), path.abspath(path.join(temp_dir, "input.%d.png" % i))], psem) for i, image in enumerate(images_with_shared_globals)]) cmd = [JBIG2_CMD, "-p"] if symbol_mode: cmd.extend(["-s", "-t", format_number(self.jbig2_threshold, 4)]) for i, _ in enumerate(images_with_shared_globals): cmd.append(path.abspath(path.join(temp_dir, "input.%d.png" % i))) jbig2_images = [] jbig2_globals = None if symbol_mode: yield from run_command_async(cmd, psem, cwd=temp_dir) jbig2_globals = PdfDict() jbig2_globals.indirect = True with open(path.join(temp_dir, "output.sym"), "rb") as f: jbig2_globals.stream = f.read().decode("latin-1") for i, _ in enumerate(images_with_shared_globals): with open(path.join(temp_dir, "output.%04d" % i), "rb") as f: jbig2_images.append(f.read()) else: jbig2_images.append( (yield from run_command_async(cmd, psem, cwd=temp_dir))) return jbig2_images, jbig2_globals @asyncio.coroutine def get_image_mask(image, psem): if image._mask is None: return None return (yield from image._mask.pdf_image(psem)) ((jbig2_images, jbig2_globals), image_masks) = yield from asyncio.gather( get_jbig2_images(psem), asyncio.gather(*[get_image_mask(image, psem) for image in images_with_shared_globals])) for image, jbig2_image, image_mask, image_future in zip( images_with_shared_globals, jbig2_images, image_masks, image_futures): (width, height, xres, yres) = struct.unpack( '>IIII', jbig2_image[11:27]) pdf_image = PdfDict() pdf_image.indirect = True pdf_image.Type = PdfName.XObject pdf_image.Subtype = PdfName.Image pdf_image.Width = width pdf_image.Height = height if image._image_mask: pdf_image.ImageMask = PdfBool(True) else: pdf_image.ColorSpace = PdfName.DeviceGray if image_mask is not None: pdf_image.Mask = image_mask pdf_image.BitsPerComponent = 1 pdf_image.Filter = [PdfName.JBIG2Decode] if symbol_mode: pdf_image.DecodeParms = [{ PdfName.JBIG2Globals: jbig2_globals}] pdf_image.stream = jbig2_image.decode("latin-1") image_future.set_result(pdf_image) return my_image_future.result()
def _pdf_image(self, psem): with TemporaryDirectory(prefix="djpdf-") as temp_dir: # JBIG2Globals are only used in symbol mode # In symbol mode jbig2 writes output to files otherwise # it's written to stdout symbol_mode = self.jbig2_threshold != 1 images_with_shared_globals = [] if symbol_mode and SHARE_JBIG2_GLOBALS: # Find all Jbig2Images that share the same symbol directory for obj in self._factory._cache: if (isinstance(obj, Jbig2Image) and self.compression == obj.compression and self.jbig2_threshold == obj.jbig2_threshold): images_with_shared_globals.append(obj) else: # The symbol directory is not shared with other Jbig2Images images_with_shared_globals.append(self) # Promise all handled Jbig2Images the finished image image_futures = [] my_image_future = None for image in images_with_shared_globals: future = asyncio.Future() asyncio.ensure_future(image._cache.get(future)) image_futures.append(future) if image is self: my_image_future = future # All futures are in place, the lock can be released self._factory._cache_lock.release() self._cache_lock_acquired = False # Prepare everything in parallel @asyncio.coroutine def get_jbig2_images(psem): # Convert images with ImageMagick to bitonal png in parallel yield from asyncio.gather(*[ run_command_async([ CONVERT_CMD, "-alpha", "remove", "-alpha", "off", "-colorspace", "gray", "-threshold", "50%", path.abspath(image.filename), path.abspath(path.join(temp_dir, "input.%d.png" % i)) ], psem) for i, image in enumerate(images_with_shared_globals) ]) cmd = [JBIG2_CMD, "-p"] if symbol_mode: cmd.extend( ["-s", "-t", format_number(self.jbig2_threshold, 4)]) for i, _ in enumerate(images_with_shared_globals): cmd.append( path.abspath(path.join(temp_dir, "input.%d.png" % i))) jbig2_images = [] jbig2_globals = None if symbol_mode: yield from run_command_async(cmd, psem, cwd=temp_dir) jbig2_globals = PdfDict() jbig2_globals.indirect = True with open(path.join(temp_dir, "output.sym"), "rb") as f: jbig2_globals.stream = f.read().decode("latin-1") for i, _ in enumerate(images_with_shared_globals): with open(path.join(temp_dir, "output.%04d" % i), "rb") as f: jbig2_images.append(f.read()) else: jbig2_images.append((yield from run_command_async(cmd, psem, cwd=temp_dir))) return jbig2_images, jbig2_globals @asyncio.coroutine def get_image_mask(image, psem): if image._mask is None: return None return (yield from image._mask.pdf_image(psem)) ((jbig2_images, jbig2_globals), image_masks) = yield from asyncio.gather( get_jbig2_images(psem), asyncio.gather(*[ get_image_mask(image, psem) for image in images_with_shared_globals ])) for image, jbig2_image, image_mask, image_future in zip( images_with_shared_globals, jbig2_images, image_masks, image_futures): (width, height, xres, yres) = struct.unpack('>IIII', jbig2_image[11:27]) pdf_image = PdfDict() pdf_image.indirect = True pdf_image.Type = PdfName.XObject pdf_image.Subtype = PdfName.Image pdf_image.Width = width pdf_image.Height = height if image._image_mask: pdf_image.ImageMask = PdfBool(True) else: # NOTE: DefaultGray color space is required for PDF/A pdf_image.ColorSpace = PdfName.DeviceGray if image_mask is not None: pdf_image.Mask = image_mask pdf_image.BitsPerComponent = 1 pdf_image.Filter = [PdfName.JBIG2Decode] if symbol_mode: pdf_image.DecodeParms = [{ PdfName.JBIG2Globals: jbig2_globals }] pdf_image.stream = jbig2_image.decode("latin-1") image_future.set_result(pdf_image) return my_image_future.result()