300 lines
11 KiB
Python
300 lines
11 KiB
Python
from lib.hachoir_metadata.metadata import (registerExtractor,
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Metadata, RootMetadata, MultipleMetadata)
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from lib.hachoir_parser.image import (
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BmpFile, IcoFile, PcxFile, GifFile, PngFile, TiffFile,
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XcfFile, TargaFile, WMF_File, PsdFile)
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from lib.hachoir_parser.image.png import getBitsPerPixel as pngBitsPerPixel
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from lib.hachoir_parser.image.xcf import XcfProperty
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from lib.hachoir_core.i18n import _
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from lib.hachoir_metadata.safe import fault_tolerant
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def computeComprRate(meta, compr_size):
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"""
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Compute image compression rate. Skip size of color palette, focus on
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image pixels. Original size is width x height x bpp. Compressed size
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is an argument (in bits).
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Set "compr_data" with a string like "1.52x".
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"""
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if not meta.has("width") \
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or not meta.has("height") \
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or not meta.has("bits_per_pixel"):
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return
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if not compr_size:
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return
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orig_size = meta.get('width') * meta.get('height') * meta.get('bits_per_pixel')
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meta.compr_rate = float(orig_size) / compr_size
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class BmpMetadata(RootMetadata):
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def extract(self, image):
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if "header" not in image:
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return
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hdr = image["header"]
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self.width = hdr["width"].value
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self.height = hdr["height"].value
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bpp = hdr["bpp"].value
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if bpp:
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if bpp <= 8 and "used_colors" in hdr:
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self.nb_colors = hdr["used_colors"].value
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self.bits_per_pixel = bpp
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self.compression = hdr["compression"].display
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self.format_version = u"Microsoft Bitmap version %s" % hdr.getFormatVersion()
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self.width_dpi = hdr["horizontal_dpi"].value
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self.height_dpi = hdr["vertical_dpi"].value
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if "pixels" in image:
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computeComprRate(self, image["pixels"].size)
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class TiffMetadata(RootMetadata):
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key_to_attr = {
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"img_width": "width",
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"img_height": "width",
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# TODO: Enable that (need link to value)
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# "description": "comment",
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# "doc_name": "title",
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# "orientation": "image_orientation",
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}
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def extract(self, tiff):
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if "ifd" in tiff:
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self.useIFD(tiff["ifd"])
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def useIFD(self, ifd):
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for field in ifd:
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try:
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attrname = self.key_to_attr[field.name]
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except KeyError:
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continue
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if "value" not in field:
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continue
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value = field["value"].value
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setattr(self, attrname, value)
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class IcoMetadata(MultipleMetadata):
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color_to_bpp = {
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2: 1,
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16: 4,
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256: 8
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}
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def extract(self, icon):
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for index, header in enumerate(icon.array("icon_header")):
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image = Metadata(self)
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# Read size and colors from header
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image.width = header["width"].value
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image.height = header["height"].value
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bpp = header["bpp"].value
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nb_colors = header["nb_color"].value
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if nb_colors != 0:
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image.nb_colors = nb_colors
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if bpp == 0 and nb_colors in self.color_to_bpp:
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bpp = self.color_to_bpp[nb_colors]
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elif bpp == 0:
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bpp = 8
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image.bits_per_pixel = bpp
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image.setHeader(_("Icon #%u (%sx%s)")
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% (1+index, image.get("width", "?"), image.get("height", "?")))
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# Read compression from data (if available)
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key = "icon_data[%u]/header/codec" % index
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if key in icon:
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image.compression = icon[key].display
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key = "icon_data[%u]/pixels" % index
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if key in icon:
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computeComprRate(image, icon[key].size)
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# Store new image
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self.addGroup("image[%u]" % index, image)
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class PcxMetadata(RootMetadata):
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@fault_tolerant
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def extract(self, pcx):
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self.width = 1 + pcx["xmax"].value
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self.height = 1 + pcx["ymax"].value
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self.width_dpi = pcx["horiz_dpi"].value
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self.height_dpi = pcx["vert_dpi"].value
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self.bits_per_pixel = pcx["bpp"].value
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if 1 <= pcx["bpp"].value <= 8:
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self.nb_colors = 2 ** pcx["bpp"].value
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self.compression = _("Run-length encoding (RLE)")
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self.format_version = "PCX: %s" % pcx["version"].display
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if "image_data" in pcx:
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computeComprRate(self, pcx["image_data"].size)
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class XcfMetadata(RootMetadata):
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# Map image type to bits/pixel
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TYPE_TO_BPP = {0: 24, 1: 8, 2: 8}
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def extract(self, xcf):
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self.width = xcf["width"].value
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self.height = xcf["height"].value
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try:
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self.bits_per_pixel = self.TYPE_TO_BPP[ xcf["type"].value ]
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except KeyError:
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pass
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self.format_version = xcf["type"].display
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self.readProperties(xcf)
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@fault_tolerant
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def processProperty(self, prop):
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type = prop["type"].value
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if type == XcfProperty.PROP_PARASITES:
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for field in prop["data"]:
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if "name" not in field or "data" not in field:
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continue
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if field["name"].value == "gimp-comment":
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self.comment = field["data"].value
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elif type == XcfProperty.PROP_COMPRESSION:
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self.compression = prop["data/compression"].display
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elif type == XcfProperty.PROP_RESOLUTION:
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self.width_dpi = int(prop["data/xres"].value)
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self.height_dpi = int(prop["data/yres"].value)
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def readProperties(self, xcf):
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for prop in xcf.array("property"):
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self.processProperty(prop)
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class PngMetadata(RootMetadata):
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TEXT_TO_ATTR = {
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"software": "producer",
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}
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def extract(self, png):
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if "header" in png:
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self.useHeader(png["header"])
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if "time" in png:
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self.useTime(png["time"])
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if "physical" in png:
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self.usePhysical(png["physical"])
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for comment in png.array("text"):
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if "text" not in comment:
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continue
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keyword = comment["keyword"].value
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text = comment["text"].value
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try:
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key = self.TEXT_TO_ATTR[keyword.lower()]
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setattr(self, key, text)
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except KeyError:
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if keyword.lower() != "comment":
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self.comment = "%s=%s" % (keyword, text)
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else:
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self.comment = text
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compr_size = sum( data.size for data in png.array("data") )
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computeComprRate(self, compr_size)
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@fault_tolerant
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def useTime(self, field):
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self.creation_date = field.value
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@fault_tolerant
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def usePhysical(self, field):
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self.width_dpi = field["pixel_per_unit_x"].value
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self.height_dpi = field["pixel_per_unit_y"].value
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@fault_tolerant
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def useHeader(self, header):
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self.width = header["width"].value
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self.height = header["height"].value
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# Read number of colors and pixel format
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if "/palette/size" in header:
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nb_colors = header["/palette/size"].value // 3
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else:
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nb_colors = None
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if not header["has_palette"].value:
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if header["has_alpha"].value:
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self.pixel_format = _("RGBA")
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else:
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self.pixel_format = _("RGB")
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elif "/transparency" in header:
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self.pixel_format = _("Color index with transparency")
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if nb_colors:
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nb_colors -= 1
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else:
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self.pixel_format = _("Color index")
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self.bits_per_pixel = pngBitsPerPixel(header)
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if nb_colors:
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self.nb_colors = nb_colors
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# Read compression, timestamp, etc.
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self.compression = header["compression"].display
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class GifMetadata(RootMetadata):
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def extract(self, gif):
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self.useScreen(gif["/screen"])
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if self.has("bits_per_pixel"):
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self.nb_colors = (1 << self.get('bits_per_pixel'))
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self.compression = _("LZW")
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self.format_version = "GIF version %s" % gif["version"].value
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for comments in gif.array("comments"):
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for comment in gif.array(comments.name + "/comment"):
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self.comment = comment.value
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if "graphic_ctl/has_transp" in gif and gif["graphic_ctl/has_transp"].value:
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self.pixel_format = _("Color index with transparency")
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else:
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self.pixel_format = _("Color index")
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@fault_tolerant
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def useScreen(self, screen):
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self.width = screen["width"].value
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self.height = screen["height"].value
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self.bits_per_pixel = (1 + screen["bpp"].value)
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class TargaMetadata(RootMetadata):
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def extract(self, tga):
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self.width = tga["width"].value
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self.height = tga["height"].value
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self.bits_per_pixel = tga["bpp"].value
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if tga["nb_color"].value:
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self.nb_colors = tga["nb_color"].value
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self.compression = tga["codec"].display
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if "pixels" in tga:
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computeComprRate(self, tga["pixels"].size)
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class WmfMetadata(RootMetadata):
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def extract(self, wmf):
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if wmf.isAPM():
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if "amf_header/rect" in wmf:
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rect = wmf["amf_header/rect"]
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self.width = (rect["right"].value - rect["left"].value)
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self.height = (rect["bottom"].value - rect["top"].value)
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self.bits_per_pixel = 24
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elif wmf.isEMF():
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emf = wmf["emf_header"]
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if "description" in emf:
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desc = emf["description"].value
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if "\0" in desc:
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self.producer, self.title = desc.split("\0", 1)
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else:
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self.producer = desc
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if emf["nb_colors"].value:
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self.nb_colors = emf["nb_colors"].value
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self.bits_per_pixel = 8
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else:
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self.bits_per_pixel = 24
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self.width = emf["width_px"].value
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self.height = emf["height_px"].value
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class PsdMetadata(RootMetadata):
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@fault_tolerant
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def extract(self, psd):
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self.width = psd["width"].value
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self.height = psd["height"].value
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self.bits_per_pixel = psd["depth"].value * psd["nb_channels"].value
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self.pixel_format = psd["color_mode"].display
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self.compression = psd["compression"].display
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registerExtractor(IcoFile, IcoMetadata)
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registerExtractor(GifFile, GifMetadata)
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registerExtractor(XcfFile, XcfMetadata)
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registerExtractor(TargaFile, TargaMetadata)
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registerExtractor(PcxFile, PcxMetadata)
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registerExtractor(BmpFile, BmpMetadata)
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registerExtractor(PngFile, PngMetadata)
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registerExtractor(TiffFile, TiffMetadata)
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registerExtractor(WMF_File, WmfMetadata)
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registerExtractor(PsdFile, PsdMetadata)
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