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% of the license contained in the file LICENSE in this distribution.
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% Artifex Software, Inc., 1305 Grant Avenue - Suite 200, Novato,
% CA 94945, U.S.A., +1(415)492-9861, for further information.
%
% gs_dpnxt.ps
% NeXT Display PostScript extensions
% Define the operation values for compositing. These must match the values
% in gsdpnext.h, which also are the ones from the NeXT documentation.
% We put them in systemdict, which seems like as good a place as any.
mark
/Clear /Copy /Sover /Sin /Sout /Satop /Dover /Din /Dout /Datop /Xor
/PlusD /PlusL /Highlight % not sure about Highlight
counttomark { counttomark 1 sub def } repeat pop
% We implement readimage and sizeimage using the following 3 otherwise
% undocumented lower-level operators:
%
% <x> <y> <width> <height> <matrix> .sizeimagebox
% <dev_x> <dev_y> <dev_width> <dev_height> <matrix>
%
% - .sizeimageparams <bits/sample> <multiproc> <ncolors>
%
% <device> <x> <y> <width> <max_height> <alpha?> <std_depth|null>
% <string> .getbitsrect <height> <substring>
%
% NOTE: These operators are subject to change without notice!
% Implement readimage using .getbitsrect. Experimentation on a NeXT system
% shows that the data is always returned in order of increasing device Y,
% regardless of the CTM.
%
% Note that we can't make stack protection work for this operator,
% because it must remove its operands from the stack before calling
% the supplied procedure(s).
/readimage { % <x> <y> <width> <height> <proc> [... <procN-1>]
% <string> <alpha?> readimage -
.sizeimageparams exch {
% multiproc = true. If N > 1, store the procedures in an array.
exch pop 1 index { 1 add } if
% Stack: ... string alpha? nprocs
dup 1 eq {
pop //false % only 1 procedure, multiproc is irrelevant
} {
dup array 4 1 roll 3 add 2 roll astore 3 1 roll //true
} ifelse
} {
% multiproc = false.
pop pop //false
} ifelse
% Map the rectangle to device coordinates.
% Stack: x y w h proc(s) str alpha? multi?
8 -4 roll matrix .sizeimagebox pop 8 4 roll
% Make sure we allocate the operand array in local VM
% to avoid a possible invalidaccess.
.currentglobal //false .setglobal 9 1 roll
exch { 1 } { 0 } ifelse exch % alpha is last, if present
exch 4 1 roll 8 array astore exch .setglobal
{ % Read out a block of scan lines and pass them to the procedure.
% Stack: [x y w h alpha? proc(s) str multi?] -- we must consume this.
dup 3 get 0 eq { pop exit } if
aload 9 1 roll pop exch pop currentdevice 7 1 roll
% Always read out the data as standard (not native) pixels.
.sizeimageparams pop pop exch .getbitsrect
% Stack: [x y w h alpha? proc(s) str multi?] hread substr
3 -1 roll
% Stack: hread substr [x y w h alpha? proc(s) str multi?]
dup 1 2 copy get 5 index add put
% Stack: hread substr [x y' w h alpha? proc(s) str multi?]
dup 3 2 copy get 6 -1 roll sub put
% Stack: substr [x y' w h' alpha? proc(s) str multi?]
dup 5 get exch 7 get {
% multiproc = true, pass each plane to a different procedure.
% Stack: substr procs
0 1 2 index length 1 sub {
% Push 1 plane and its procedure under the top 2 elements.
% Stack: ... substr procs plane#
2 index length 2 index length idiv % bytes per plane
dup 2 index mul exch
% Stack: ... substr procs plane# start length
4 index 3 1 roll getinterval 4 1 roll
2 copy get 4 1 roll pop
} for
exch pop length 2 mul .execn
} {
% multiproc = false, just call the procedure.
exec
} ifelse
} //systemdict /exec get 3 packedarray cvx loop
} bind odef
%
% <w> <h> <bpc> <mtx> <dsrc0> ... <multi> <ncomp> alphaimage -
%
img_utils_dict begin
/.alphaimage where
{
pop
.currentglobal //true .setglobal
/alphaimage
{
//true
//.colorimage
stopped
{ /alphaimage .systemvar $error /errorname get signalerror }
if
}
.bind systemdict begin odef end
.setglobal
}
if
end
% Implement sizeimage using lower-level operators.
/sizeimage { % <x> <y> <width> <height> <matrix> sizeimage
% <devwidth> <devheight> <bits/sample> <matrix>
% <multiproc> <ncolors>
.sizeimagebox 5 -2 roll pop pop
.sizeimageparams 3 -1 roll 4 1 roll
} bind odef
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