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# Window descriptor structure.
define LEN_WDES (210+(W_MAXWC+1)*LEN_WC)
define LEN_WC 10 # 4=[XbXeYbYe]+2=tr_type[xy]
define W_MAXWC 5 # max world coord systems
define W_SZSTRING 99 # size of strings
define W_SZIMSECT W_SZSTRING # image section string
define W_DEVICE Memi[$1]
define W_FRAME Memi[$1+1] # device frame number
define W_XRES Memi[$1+2] # device resolution, x
define W_YRES Memi[$1+3] # device resolution, y
define W_BPDISP Memi[$1+4] # bad pixel display option
define W_BPCOLORS Memi[$1+5] # overlay colors
define W_OCOLORS Memi[$1+6] # badpixel colors
define W_IMSECT Memc[P2C($1+10)] # image section
define W_OVRLY Memc[P2C($1+60)] # overlay mask
define W_BPM Memc[P2C($1+110)] # bad pixel mask
define W_ZPM Memc[P2C($1+160)] # Z scaling pixel mask
define W_WC ($1+$2*LEN_WC+210) # ptr to coord descriptor
# Fields of the WC coordinate descriptor, a substructure of the window
# descriptor. "W_XB(W_WC(w,0))" is the XB field of wc 0 of window W.
define W_XS Memr[P2R($1)] # starting X value
define W_XE Memr[P2R($1+1)] # ending X value
define W_XT Memi[$1+2] # X transformation type
define W_YS Memr[P2R($1+3)] # starting Y value
define W_YE Memr[P2R($1+4)] # ending Y value
define W_YT Memi[$1+5] # Y transformation type
define W_ZS Memr[P2R($1+6)] # starting Z value (greyscale)
define W_ZE Memr[P2R($1+7)] # ending Z value
define W_ZT Memi[$1+8] # Z transformation type
define W_UPTR Memi[$1+9] # LUT when ZT=USER
# WC types.
define W_NWIN 0 # Display window in NDC coordinates
define W_DWIN 1 # Display window in image pixel coordinates
define W_WWIN 2 # Display window in image world coordinates
define W_IPIX 3 # Image pixel coordinates (in pixels)
define W_DPIX 4 # Display pixel coordinates (in pixels)
# Types of coordinate and greyscale transformations.
define W_UNITARY 0 # values map without change
define W_LINEAR 1 # linear mapping
define W_LOG 2 # logarithmic mapping
define W_USER 3 # user specifies transformation
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