332 lines
10 KiB
Python
332 lines
10 KiB
Python
"""
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Gimp image parser (XCF file, ".xcf" extension).
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You can find informations about XCF file in Gimp source code. URL to read
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CVS online:
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http://cvs.gnome.org/viewcvs/gimp/app/xcf/
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\--> files xcf-read.c and xcf-load.c
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Author: Victor Stinner
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"""
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from lib.hachoir_parser import Parser
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from lib.hachoir_core.field import (StaticFieldSet, FieldSet, ParserError,
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UInt8, UInt32, Enum, Float32, String, PascalString32, RawBytes)
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from lib.hachoir_parser.image.common import RGBA
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from lib.hachoir_core.endian import NETWORK_ENDIAN
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class XcfCompression(FieldSet):
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static_size = 8
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COMPRESSION_NAME = {
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0: u"None",
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1: u"RLE",
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2: u"Zlib",
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3: u"Fractal"
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}
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def createFields(self):
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yield Enum(UInt8(self, "compression", "Compression method"), self.COMPRESSION_NAME)
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class XcfResolution(StaticFieldSet):
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format = (
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(Float32, "xres", "X resolution in DPI"),
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(Float32, "yres", "Y resolution in DPI")
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)
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class XcfTattoo(StaticFieldSet):
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format = ((UInt32, "tattoo", "Tattoo"),)
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class LayerOffsets(StaticFieldSet):
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format = (
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(UInt32, "ofst_x", "Offset X"),
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(UInt32, "ofst_y", "Offset Y")
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)
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class LayerMode(FieldSet):
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static_size = 32
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MODE_NAME = {
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0: u"Normal",
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1: u"Dissolve",
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2: u"Behind",
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3: u"Multiply",
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4: u"Screen",
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5: u"Overlay",
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6: u"Difference",
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7: u"Addition",
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8: u"Subtract",
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9: u"Darken only",
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10: u"Lighten only",
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11: u"Hue",
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12: u"Saturation",
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13: u"Color",
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14: u"Value",
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15: u"Divide",
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16: u"Dodge",
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17: u"Burn",
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18: u"Hard light",
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19: u"Soft light",
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20: u"Grain extract",
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21: u"Grain merge",
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22: u"Color erase"
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}
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def createFields(self):
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yield Enum(UInt32(self, "mode", "Layer mode"), self.MODE_NAME)
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class GimpBoolean(UInt32):
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def __init__(self, parent, name):
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UInt32.__init__(self, parent, name)
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def createValue(self):
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return 1 == UInt32.createValue(self)
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class XcfUnit(StaticFieldSet):
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format = ((UInt32, "unit", "Unit"),)
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class XcfParasiteEntry(FieldSet):
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def createFields(self):
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yield PascalString32(self, "name", "Name", strip="\0", charset="UTF-8")
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yield UInt32(self, "flags", "Flags")
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yield PascalString32(self, "data", "Data", strip=" \0", charset="UTF-8")
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class XcfLevel(FieldSet):
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def createFields(self):
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yield UInt32(self, "width", "Width in pixel")
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yield UInt32(self, "height", "Height in pixel")
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yield UInt32(self, "offset", "Offset")
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offset = self["offset"].value
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if offset == 0:
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return
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data_offsets = []
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while (self.absolute_address + self.current_size)/8 < offset:
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chunk = UInt32(self, "data_offset[]", "Data offset")
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yield chunk
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if chunk.value == 0:
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break
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data_offsets.append(chunk)
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if (self.absolute_address + self.current_size)/8 != offset:
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raise ParserError("Problem with level offset.")
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previous = offset
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for chunk in data_offsets:
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data_offset = chunk.value
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size = data_offset - previous
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yield RawBytes(self, "data[]", size, "Data content of %s" % chunk.name)
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previous = data_offset
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class XcfHierarchy(FieldSet):
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def createFields(self):
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yield UInt32(self, "width", "Width")
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yield UInt32(self, "height", "Height")
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yield UInt32(self, "bpp", "Bits/pixel")
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offsets = []
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while True:
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chunk = UInt32(self, "offset[]", "Level offset")
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yield chunk
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if chunk.value == 0:
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break
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offsets.append(chunk.value)
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for offset in offsets:
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padding = self.seekByte(offset, relative=False)
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if padding is not None:
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yield padding
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yield XcfLevel(self, "level[]", "Level")
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# yield XcfChannel(self, "channel[]", "Channel"))
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class XcfChannel(FieldSet):
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def createFields(self):
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yield UInt32(self, "width", "Channel width")
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yield UInt32(self, "height", "Channel height")
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yield PascalString32(self, "name", "Channel name", strip="\0", charset="UTF-8")
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for field in readProperties(self):
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yield field
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yield UInt32(self, "hierarchy_ofs", "Hierarchy offset")
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yield XcfHierarchy(self, "hierarchy", "Hierarchy")
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def createDescription(self):
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return 'Channel "%s"' % self["name"].value
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class XcfLayer(FieldSet):
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def createFields(self):
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yield UInt32(self, "width", "Layer width in pixels")
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yield UInt32(self, "height", "Layer height in pixels")
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yield Enum(UInt32(self, "type", "Layer type"), XcfFile.IMAGE_TYPE_NAME)
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yield PascalString32(self, "name", "Layer name", strip="\0", charset="UTF-8")
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for prop in readProperties(self):
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yield prop
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# --
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# TODO: Hack for Gimp 1.2 files
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# --
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yield UInt32(self, "hierarchy_ofs", "Hierarchy offset")
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yield UInt32(self, "mask_ofs", "Layer mask offset")
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padding = self.seekByte(self["hierarchy_ofs"].value, relative=False)
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if padding is not None:
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yield padding
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yield XcfHierarchy(self, "hierarchy", "Hierarchy")
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# TODO: Read layer mask if needed: self["mask_ofs"].value != 0
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def createDescription(self):
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return 'Layer "%s"' % self["name"].value
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class XcfParasites(FieldSet):
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def createFields(self):
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size = self["../size"].value * 8
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while self.current_size < size:
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yield XcfParasiteEntry(self, "parasite[]", "Parasite")
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class XcfProperty(FieldSet):
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PROP_COMPRESSION = 17
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PROP_RESOLUTION = 19
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PROP_PARASITES = 21
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TYPE_NAME = {
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0: u"End",
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1: u"Colormap",
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2: u"Active layer",
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3: u"Active channel",
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4: u"Selection",
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5: u"Floating selection",
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6: u"Opacity",
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7: u"Mode",
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8: u"Visible",
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9: u"Linked",
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10: u"Lock alpha",
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11: u"Apply mask",
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12: u"Edit mask",
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13: u"Show mask",
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14: u"Show masked",
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15: u"Offsets",
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16: u"Color",
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17: u"Compression",
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18: u"Guides",
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19: u"Resolution",
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20: u"Tattoo",
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21: u"Parasites",
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22: u"Unit",
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23: u"Paths",
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24: u"User unit",
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25: u"Vectors",
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26: u"Text layer flags",
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}
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handler = {
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6: RGBA,
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7: LayerMode,
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8: GimpBoolean,
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9: GimpBoolean,
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10: GimpBoolean,
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11: GimpBoolean,
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12: GimpBoolean,
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13: GimpBoolean,
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15: LayerOffsets,
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17: XcfCompression,
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19: XcfResolution,
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20: XcfTattoo,
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21: XcfParasites,
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22: XcfUnit
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}
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def __init__(self, *args, **kw):
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FieldSet.__init__(self, *args, **kw)
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self._size = (8 + self["size"].value) * 8
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def createFields(self):
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yield Enum(UInt32(self, "type", "Property type"), self.TYPE_NAME)
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yield UInt32(self, "size", "Property size")
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size = self["size"].value
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if 0 < size:
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cls = self.handler.get(self["type"].value, None)
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if cls:
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yield cls(self, "data", size=size*8)
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else:
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yield RawBytes(self, "data", size, "Data")
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def createDescription(self):
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return "Property: %s" % self["type"].display
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def readProperties(parser):
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while True:
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prop = XcfProperty(parser, "property[]")
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yield prop
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if prop["type"].value == 0:
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return
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class XcfFile(Parser):
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PARSER_TAGS = {
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"id": "xcf",
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"category": "image",
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"file_ext": ("xcf",),
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"mime": (u"image/x-xcf", u"application/x-gimp-image"),
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"min_size": (26 + 8 + 4 + 4)*8, # header+empty property+layer offset+channel offset
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"magic": (
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('gimp xcf file\0', 0),
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('gimp xcf v002\0', 0),
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),
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"description": "Gimp (XCF) picture"
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}
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endian = NETWORK_ENDIAN
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IMAGE_TYPE_NAME = {
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0: u"RGB",
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1: u"Gray",
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2: u"Indexed"
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}
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def validate(self):
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if self.stream.readBytes(0, 14) not in ('gimp xcf file\0', 'gimp xcf v002\0'):
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return "Wrong signature"
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return True
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def createFields(self):
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# Read signature
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yield String(self, "signature", 14, "Gimp picture signature (ends with nul byte)", charset="ASCII")
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# Read image general informations (width, height, type)
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yield UInt32(self, "width", "Image width")
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yield UInt32(self, "height", "Image height")
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yield Enum(UInt32(self, "type", "Image type"), self.IMAGE_TYPE_NAME)
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for prop in readProperties(self):
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yield prop
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# Read layer offsets
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layer_offsets = []
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while True:
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chunk = UInt32(self, "layer_offset[]", "Layer offset")
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yield chunk
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if chunk.value == 0:
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break
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layer_offsets.append(chunk.value)
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# Read channel offsets
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channel_offsets = []
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while True:
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chunk = UInt32(self, "channel_offset[]", "Channel offset")
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yield chunk
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if chunk.value == 0:
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break
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channel_offsets.append(chunk.value)
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# Read layers
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for index, offset in enumerate(layer_offsets):
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if index+1 < len(layer_offsets):
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size = (layer_offsets[index+1] - offset) * 8
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else:
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size = None
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padding = self.seekByte(offset, relative=False)
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if padding:
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yield padding
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yield XcfLayer(self, "layer[]", size=size)
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# Read channels
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for index, offset in enumerate(channel_offsets):
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if index+1 < len(channel_offsets):
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size = (channel_offsets[index+1] - offset) * 8
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else:
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size = None
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padding = self.seekByte(offset, relative=False)
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if padding is not None:
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yield padding
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yield XcfChannel(self, "channel[]", "Channel", size=size)
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