#------------------------------------------------------------------------------
-# $File: images,v 1.113 2016/01/19 16:35:14 christos Exp $
+# $File: images,v 1.114 2016/03/11 18:10:06 christos Exp $
# images: file(1) magic for image formats (see also "iff", and "c-lang" for
# XPM bitmaps)
#
# Targa - matches `povray', `ppmtotga' and `xv' outputs
# by Philippe De Muyter <phdm@macqel.be>
+# URL: http://justsolve.archiveteam.org/wiki/TGA
+# Reference: http://www.dca.fee.unicamp.br/~martino/disciplinas/ea978/tgaffs.pdf
+# Update: Joerg Jenderek
# at 2, byte ImgType must be 1, 2, 3, 9, 10 or 11
+# ,32 or 33 (both not observed)
# at 1, byte CoMapType must be 1 if ImgType is 1 or 9, 0 otherwise
+# or theoretically 2-128 reserved for use by Truevision or 128-255 may be used for developer applications
# at 3, leshort Index is 0 for povray, ppmtotga and xv outputs
# `xv' recognizes only a subset of the following (RGB with pixelsize = 24)
# `tgatoppm' recognizes a superset (Index may be anything)
-1 belong&0xfff7ffff 0x01010000 Targa image data - Map
-!:strength + 2
->2 byte&8 8 - RLE
->12 leshort >0 %d x
->14 leshort >0 %d
-1 belong&0xfff7ffff 0x00020000 Targa image data - RGB
-!:strength + 2
->2 byte&8 8 - RLE
->12 leshort >0 %d x
->14 leshort >0 %d
-1 belong&0xfff7ffff 0x00030000 Targa image data - Mono
-!:strength + 2
->2 byte&8 8 - RLE
->12 leshort >0 %d x
->14 leshort >0 %d
+#
+# test of Color Map Type 0~no 1~color map
+# and Image Type 1 2 3 9 10 11 32 33
+# and Color Map Entry Size 0 15 16 24 32
+0 ubequad&0x00FeC400000000C0 0
+# skip more garbage by looking for positive image type
+>2 ubyte >0
+# skip some compiled terminfo by looking for image type less equal 33
+>>2 ubyte <34
+# skip arches.3200 , Finder.Root , Slp.1 by looking for low pixel sizes 15 16 24 32
+>>>16 ubyte <33
+# skip more by looking for pixel size 0Fh 10h 18h 20h
+>>>>16 ubyte&0xC0 0x00
+# skip 260-16.ico by looking for no color map
+>>>>>1 ubyte 0
+# implies no first map entry
+>>>>>>3 uleshort 0
+>>>>>>>0 use tga-image
+# Color Map
+>>>>>1 ubyte >0
+>>>>>>0 use tga-image
+# display tga bitmap image information
+0 name tga-image
+>2 ubyte <34 Targa image data
+!:mime image/x-tga
+!:apple ????TPIC
+# normal extension .tga but some Truevision products used others:
+# tpic (Apple),icb (Image Capture Board),vda (Video Display Adapter),vst (NuVista),win (UNSURE about that)
+!:ext tga/tpic/icb/vda/vst
+# image type 1 2 3 9 10 11 32 33
+>2 ubyte&0xF7 1 - Map
+>2 ubyte&0xF7 2 - RGB
+# alpha channel
+>>17 ubyte&0x0F >0 \bA
+>2 ubyte&0xF7 3 - Mono
+# type not found, but by http://www.fileformat.info/format/tga/corion.htm
+# Compressed color-mapped data, using Huffman, Delta, and runlength encoding
+>2 ubyte 32 - Color
+# Compressed color-mapped data, using Huffman, Delta, and RLE. 4-pass quadtree- type process
+>2 ubyte 33 - Color
+# Color Map Type 0~no 1~color map
+>1 ubyte 1 (
+# first color map entry, 0 normal
+>>3 uleshort >0 \b%d-
+# color map length 0 2 1dh 3bh d9h 100h
+>>5 uleshort x \b%d)
+# 8~run length encoding bit
+>2 ubyte&0x08 8 - RLE
+# gimp can create big pictures!
+>12 uleshort >0 %d x
+>12 uleshort =0 65536 x
+# image height. 0 interpreted as 65536
+>14 uleshort >0 %d
+>14 uleshort =0 65536
+# Image Pixel Size 15 16 24 32
+>16 ubyte x x %d
+# X origin of image. 0 normal
+>8 uleshort >0 +%d
+# Y origin of image. 0 normal; positive for top
+>10 uleshort >0 +%d
+# Image descriptor: bits 3-0 give the alpha channel depth, bits 5-4 give direction
+>17 ubyte&0x0F >0 - %d-bit alpha
+# bits 5-4 give direction. normal bottom left
+>17 ubyte &0x20 - top
+#>17 ubyte ^0x20 - bottom
+>17 ubyte &0x10 - right
+#>17 ubyte ^0x10 - left
+# some info say other bits 6-7 should be zero
+# but data storage interleave by http://www.fileformat.info/format/tga/corion.htm
+# 00 - no interleave;01 - even/odd interleave; 10 - four way interleave; 11 - reserved
+#>17 ubyte&0xC0 0x00 - no interleave
+>17 ubyte&0xC0 0x40 - interleave
+>17 ubyte&0xC0 0x80 - four way interleave
+>17 ubyte&0xC0 0xC0 - reserved
+# positive length implies identification field
+>0 ubyte >0
+>>18 string x "%s"
+# last 18 bytes of newer tga file footer signature
+>18 search/4261301/s TRUEVISION-XFILE.\0
+# extension area offset if not 0
+>>&-8 ulelong >0
+# length of the extension area. normal 495 for version 2.0
+>>>(&-4.l) uleshort 0x01EF
+# AuthorName[41]
+>>>>&0 string >\0 - author "%-.40s"
+# Comment[324]=4 * 80 null terminated
+>>>>&41 string >\0 - comment "%-.80s"
+# date
+>>>>&365 ubequad&0xffffFFFFffff0000 !0
+# Day
+>>>>>&-6 uleshort x %d
+# Month
+>>>>>&-8 uleshort x \b-%d
+# Year
+>>>>>&-4 uleshort x \b-%d
+# time
+>>>>&371 ubequad&0xffffFFFFffff0000 !0
+# hour
+>>>>>&-8 uleshort x %d
+# minutes
+>>>>>&-6 uleshort x \b:%.2d
+# second
+>>>>>&-4 uleshort x \b:%.2d
+# JobName[41]
+>>>>&377 string >\0 - job "%-.40s"
+# JobHour Jobminute Jobsecond
+>>>>&418 ubequad&0xffffFFFFffff0000 !0
+>>>>>&-8 uleshort x %d
+>>>>>&-6 uleshort x \b:%.2d
+>>>>>&-4 uleshort x \b:%.2d
+# SoftwareId[41]
+>>>>&424 string >\0 - %-.40s
+# SoftwareVersionNumber
+>>>>&424 ubyte >0
+>>>>>&40 uleshort/100 x %d
+>>>>>&40 uleshort%100 x \b.%d
+# VersionLetter
+>>>>>&42 ubyte >0x20 \b%c
+# KeyColor
+>>>>&468 ulelong >0 - keycolor 0x%8.8x
+# Denominator of Pixel ratio. 0~no pixel aspect
+>>>>&474 uleshort >0
+# Numerator
+>>>>>&-4 uleshort >0 - aspect %d
+>>>>>&-2 uleshort x \b/%d
+# Denominator of Gamma ratio. 0~no Gamma value
+>>>>&478 uleshort >0
+# Numerator
+>>>>>&-4 uleshort >0 - gamma %d
+>>>>>&-2 uleshort x \b/%d
+# ColorOffset
+#>>>>&480 ulelong x - col offset 0x%8.8x
+# StampOffset
+#>>>>&484 ulelong x - stamp offset 0x%8.8x
+# ScanOffset
+#>>>>&488 ulelong x - scan offset 0x%8.8x
+# AttributesType
+#>>>>&492 ubyte x - Attributes 0x%x
+## EndOfTGA
# PBMPLUS images
# The next byte following the magic is always whitespace.
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