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✏️ gs_setpd.ps
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% Copyright (C) 2001-2019 Artifex Software, Inc. % All Rights Reserved. % % This software is provided AS-IS with no warranty, either express or % implied. % % This software is distributed under license and may not be copied, % modified or distributed except as expressly authorized under the terms % of the license contained in the file LICENSE in this distribution. % % Refer to licensing information at http://www.artifex.com or contact % Artifex Software, Inc., 1305 Grant Avenue - Suite 200, Novato, % CA 94945, U.S.A., +1(415)492-9861, for further information. % % The current implementation of setpagedevice has the following limitations: % - It doesn't attempt to "interact with the user" for Policy = 2. languagelevel 1 .setlanguagelevel level2dict begin % ---------------- Redefinitions ---------------- % % Define interpreter callouts for handling gstate-saving operators, % to make sure that they create a page device dictionary for use by % the corresponding gstate-restoring operator. % We'd really like to avoid the cost of doing this, but we don't see how. % The names %gsavepagedevice, %savepagedevice, %gstatepagedevice, % %copygstatepagedevice, and %currentgstatepagedevice are known to the % interpreter. (%gsavepagedevice) cvn { currentpagedevice pop gsave } bind def (%savepagedevice) cvn { currentpagedevice pop save } bind def (%gstatepagedevice) cvn { currentpagedevice pop gstate } bind def (%copygstatepagedevice) cvn { currentpagedevice pop copy } bind def (%currentgstatepagedevice) cvn { currentpagedevice pop currentgstate } bind def % Define interpreter callouts for handling gstate-restoring operators % when the current page device needs to be changed. % The names %grestorepagedevice, %grestoreallpagedevice, % %restorepagedevice, %restore1pagedevice, and %setgstatepagedevice % are known to the interpreter. % ---------------- Keys and Attributes ---------------- % % We have to deal specially with entries that the driver may change % on its own. We also have to deal specially with parameters which the device may % change on its own but which we *also* want to transmit to the device. Previously % any parameter which was 'dynamic' would not be sent to the device, making it % impossible to set a parameter, and later have the device change it. Currently % only OutputICCProfile fits this category. % This whole area is broken its completely the wrong way round from the way the spec says it should work. % This dictionary contains the keys we never want to set. /.readonlypdkeys mark /.MediaSize dup % because it changes when PageSize is set /PageCount dup /Colors dup /BitsPerPixel dup /ColorValues dup .dicttomark readonly def % Bonkers, but needed by our ridiculous setpagedevice implementation. There are % some keys (at the moment, RedValues, GreenValues and BlueValues are known) which % only exist in the page device dictionary under some conditions (ProcessColorModel == DeviceRGB) % If we change the conditions, so that these keys are no longer present in the params % returned by the device, sending these keys to the device can trigger a fault. % This is a problem because of our stored dictionary: % % 1) Set up the inital dictioanry by retrieving the params from the device % 2) Change the conditions (ProcessColorModel == DeviceGray) % 3) merge any volatile keys from the device. Note that RedValues etc no longer defined. % 4) Call .installpagdevice, use the stored dicitonary to set the params % 5) The stored RedValues etc, cause an error. % % The stored dictioanry is readonly (we use forceput to wedge new keys into it) so % we can't 'undef' keys from it. (the dictionary is made readonly by the action of zsetpagedevice % '.setpagedevice' in PostScrfipt) % % So the only solution is to have 'write only' keys. These can be written to the device % but are not stored in the saved page device dictionary. This means PostScript programs % can't interrogate and take action on these, but there's no solution to that except to % rewrite this stuff completely so that it actually works properly. /.writeonlykeys mark /RedValues dup % Set by the device when ProcessColorModel changes /GreenValues dup % Set by the device when ProcessColorModel changes /BlueValues dup % Set by the device when ProcessColorModel changes /GrayValues dup % Set by the device when ProcessColorModel changes .dicttomark readonly def % This dictionary contains the keys we always want to read back from the device. /.volatilepdkeys mark /.MediaSize dup % because it changes when PageSize is set /RedValues dup % Set by the device when ProcessColorModel changes /GreenValues dup % Set by the device when ProcessColorModel changes /BlueValues dup % Set by the device when ProcessColorModel changes /GrayValues dup % Set by the device when ProcessColorModel changes /PageCount dup /Colors dup /BitsPerPixel dup /ColorValues dup /OutputICCProfile dup % ColorConversionStrategy can change this .dicttomark readonly def % The implementation of setpagedevice is quite complex. Currently, % everything but the media matching algorithm is implemented here. % By default, we only present the requested changes to the device, % but there are some parameters that require special merging action. % Define those parameters here, with the procedures that do the merging. % The procedures are called as follows: % <merged> <key> <new_value> -proc- <merged> <key> <new_value'> /.mergespecial mark /InputAttributes { dup //null eq { pop //null } { 3 copy pop .knownget { dup //null eq { pop dup length dict } { dup length 2 index length add dict .copydict } ifelse } { dup length dict } ifelse .copydict readonly } ifelse } bind /OutputAttributes 1 index /Policies { 3 copy pop .knownget { dup length 2 index length add dict .copydict } { dup length dict } ifelse copy readonly } bind .dicttomark readonly def % M. Sweet, Easy Software Products: % % Define NOMEDIAATTRS to turn off the default (but unimplementable) media % selection policies for setpagedevice. This is used by CUPS to support % the standard Adobe media attributes. NOMEDIAATTRS { % Define only PageSize for input attribute matching. /.inputattrkeys [ /PageSize ] readonly def % Define no other keys used in media selection. /.inputselectionkeys [ /noInputSelectionsKeys ] readonly def % Define no keys used in output attribute matching. /.outputattrkeys [ /noOutputAttrKeys ] readonly def } { % Define the keys used in input attribute matching. /.inputattrkeys [ /PageSize /MediaColor /MediaWeight /MediaType /InsertSheet /ManualFeed % The following are documented in Adobe's supplement for v2017. /LeadingEdge /MediaClass ] readonly def % Define other keys used in media selection. /.inputselectionkeys [ /MediaPosition /Orientation ] readonly def % Define the keys used in output attribute matching. /.outputattrkeys [ /OutputType ] readonly def } ifelse % Define all the parameters that should always be copied to the merged % dictionary. /.copiedkeys [ /OutputDevice //.mergespecial { pop } forall .inputattrkeys aload pop .inputselectionkeys aload pop .outputattrkeys aload pop ] readonly def % Define the parameters that should not be presented to the device. % The procedures are called as follows: % <merged> <key> <value> -proc- % The procedure leaves all its operands on the stack and returns % true iff the key/value pair should be presented to .putdeviceparams. /.presentspecial mark .readonlypdkeys { pop //false } forall % We must ignore an explicit request for .MediaSize, % because media matching always handles this. /.MediaSize //false /Name //false /OutputDevice //false /PageDeviceName //false /PageOffset //false /PageSize //false % obsolete alias for .MediaSize /InputAttributes //false .inputattrkeys { dup dup /PageSize eq exch /LeadingEdge eq or { pop } { { 2 index /InputAttributes .knownget { //null eq } { //true } ifelse } } ifelse } forall .inputselectionkeys { //false } forall /OutputAttributes //false .outputattrkeys { { 2 index /OutputAttributes .knownget { //null eq } { //true } ifelse } } forall /Install //false /BeginPage //false /EndPage //false /Policies //false % Our extensions: /HWColorMap { % HACK: don't transmit the color map, because % window systems can change the color map on their own % incrementally. Someday we'll have a better % solution for this.... //false } /ViewerPreProcess //false /ImagingBBox //false % This prevents the ImagingBBox value in the setpagedevice % from affecting the device's ImagingBBox parameter, but % does retain a 'shadow' copy at the PostScript level. % This is done for Adobe compatibility since Adobe does % render marks outside the ImagingBBox (and QuarkXpress % relies on it). .dicttomark readonly def % ---------------- End Keys and Attributes ---------------- % % Prepare to present parameters to the device, by spreading them onto the % operand stack and removing any that shouldn't be presented. /.prepareparams % <params> .prepareparams -mark- <key1> <value1> ... { mark exch dup { % Stack: -mark- key1 value1 ... merged key value //.presentspecial 2 index .knownget { exec { 3 -1 roll } { pop pop } ifelse } { 3 -1 roll } ifelse } forall pop } bind def currentdict /.presentspecial .undef % Compute the media size and initial matrix from a merged request (after % media selection). /.computemediasize % <request> .computemediasize % <request> <matrix> <[width height]> { dup /PageSize get % requested page size 1 index /InputAttributes get 2 index (%MediaSource) get get /PageSize get % media size % (may be a range) 2 index /Policies get dup /PageSize .knownget { exch pop } { /PolicyNotFound get } ifelse % PageSize policy, % affects scaling 3 index /Orientation .knownget not { //null } if 4 index /RollFedMedia .knownget not { //false } if matrix .matchpagesize not { % This is a "can't happen" condition! /setpagedevice .systemvar /rangecheck signalerror } if 2 array astore } bind def % Try setting the device parameters from the merged request. /.trysetparams % <merged> <(ignored)> <device> <Policies> % .trysetparams { //true 4 index //.prepareparams exec % Add the computed .MediaSize. % Stack: merged (ignored) device Policies -true- % -mark- key1 value1 ... counttomark 5 add index //.computemediasize exec exch pop exch pop /.MediaSize exch SETPDDEBUG { (Putting.) = pstack flush } if .putdeviceparamsonly SETPDDEBUG { (Result of putting.) = pstack flush } if } bind executeonly odef /.installpagedevice { % Since setpagedevice doesn't create new device objects, % we must (carefully) reinstall the old parameters in % the same device. .currentpagedevice pop //null currentdevice //null { //.trysetparams } //.internalstopped exec { //null } if dup type /booleantype eq { pop pop } { SETPDDEBUG { (Error in .trysetparams!) = pstack flush } if {cleartomark pop pop pop} //.internalstopped exec pop % if resetting the entire device state failed, at least put back the % security related key currentdevice //null //false mark /.LockSafetyParams currentpagedevice /.LockSafetyParams .knownget not {systemdict /SAFER .knownget not {//false} } if .putdeviceparamsonly /.installpagedevice cvx /rangecheck signalerror } ifelse pop pop % A careful reading of the Red Book reveals that an erasepage % should occur, but *not* an initgraphics. erasepage .beginpage } bind executeonly def /.uninstallpagedevice { {2 .endpage { .currentnumcopies //false .outputpage } if} //.internalstopped exec pop nulldevice } bind executeonly def (%grestorepagedevice) cvn { .uninstallpagedevice grestore //.installpagedevice exec } bind def (%grestoreallpagedevice) cvn { .uninstallpagedevice grestore //.installpagedevice exec grestoreall } bind def (%restore1pagedevice) cvn { .uninstallpagedevice grestore //.installpagedevice exec restore } bind def (%restorepagedevice) cvn { .uninstallpagedevice restore //.installpagedevice exec } bind def (%setgstatepagedevice) cvn { .uninstallpagedevice setgstate //.installpagedevice exec } bind def % Redefine .currentpagedevice and .setpagedevice so they convert between % null and a fixed empty directionary. /.nullpagedevice 0 dict readonly def /.currentpagedevice { //.currentpagedevice exch dup //null eq { pop //.nullpagedevice } if exch } bind odef /.setpagedevice { dup //.nullpagedevice eq { pop //null } if //.setpagedevice } bind odef % ---------------- Auxiliary definitions ---------------- % % Define the required attributes of all page devices, and their default values. % We don't include attributes such as .MediaSize, which all devices % are guaranteed to supply on their own. /.defaultpolicies mark % M. Sweet, Easy Software Products % % Due to the fact that it is not possible to properly implement % the selection policies from a Ghostscript driver, we have changed % the default policy to "7" (impose) to avoid numerous problems with % printing within CUPS... % % If NOMEDIAATTRS is false, the set the default depending on whether % PSFitPage is true. Policy 13 does best fit with page scaling up or down % so it is only useful if FIXEDMEDIA is also specified, or if the set of % media in the InputAttributes dictionary is the actual available choices % and does not include any "range" page sizes. /PageSize NOMEDIAATTRS { 7 } { //systemdict /PSFitPage known { 13 } { 0 } ifelse } ifelse /PolicyNotFound 1 /PolicyReport { dup /.LockSafetyParams known { % Only possible error is invalidaccess /setpagedevice .systemvar /invalidaccess signalerror } if pop } bind .dicttomark readonly def % Note that the values of .requiredattrs are executed, not just fetched. /.requiredattrs mark /PageDeviceName //null /PageOffset [0 0] readonly % We populate InputAttributes with all of the known page sizes % followed by a dummy media type that handles pages of any size. % This will create some duplicates, but that only slightly slows % down the media selection (loop is in zmedia2.c). % % Some PostScript creators assume that slot 0 is the default media % size and some can't handle a non-standard 4-element array which % is a 'range' type page size (always put last). % % Real Devices that can only handle specific page sizes will override this. /InputAttributes { mark % First put the device's default page size in slot 0 % This satifies those that have devices built with a4 as the default 0 mark /PageSize /GetDeviceParam .special_op not {/setpagedevice .systemvar /configurationerror signalerror} if .dicttomark % Only populate the other entries if we aren't FIXEDMEDIA FIXEDMEDIA not { statusdict /.pagetypenames get { statusdict /.pagetypeprocs get exch get 0 2 getinterval cvlit counttomark 1 sub 2 idiv exch mark exch /PageSize exch % stack: mark --dict-- --dict-- ... key mark /PageSize [x y] % see note above about pagetype executable array contents. .dicttomark } forall % If NORANGEPAGESIZE is defined, (-dNORANGEPAGESIZE), then don't add % the 'match any' PageSize entry systemdict /NORANGEPAGESIZE known not { % Add one last entry which is the 4 element range array (non-standard) counttomark 2 idiv % PageSize with either dimension 0 will be detected in % match_page_size, so we can allow it here mark /PageSize [0 dup 16#7ffff dup] .dicttomark } if } if % FIXEDMEDIA false .dicttomark } (%MediaSource) 0 /OutputAttributes { mark 0 mark .dicttomark readonly .dicttomark } (%MediaDestination) 0 /Install {{.callinstall}} bind /BeginPage {{.callbeginpage}} bind /EndPage {{.callendpage}} bind /Policies .defaultpolicies /ImagingBBox //null % default value /UseCIEColor /.getuseciecolor load .dicttomark readonly def % Define currentpagedevice so it creates the dictionary on demand if needed, % adding all the required entries defined just above. /.makecurrentpagedevice { % - .makecurrentpagedevice <dict> currentdevice //null .getdeviceparams % Make the dictionary large enough to add defaulted entries. counttomark 2 idiv //.requiredattrs length add dict counttomark 2 idiv { dup 4 2 roll put } repeat exch pop % Add any missing required attributes. % Make a writable and (if possible) local copy of any default % dictionaries, to work around a bug in the output of WordPerfect, % which assumes that these dictionaries are writable and local. .currentglobal exch dup gcheck .setglobal //.requiredattrs { 2 index 2 index known { 1 index /Policies eq { % Merge policies from the device driver with defaults 2 index % <<>> /key value <<>> 3 2 roll get % <<>> value <<policies>> exch { 2 index 2 index known { pop pop } { 2 index 3 1 roll put } ifelse } forall pop } { pop pop } ifelse } { exec 2 index 3 1 roll put } ifelse } forall exch .setglobal % Remove any keys we don't want to be stored, before .setpagedevice % makes the dictionary read only .writeonlykeys {2 index exch undef pop} forall dup .setpagedevice } bind def % Copy a dictionary recursively. /.copytree { % <dict> .copytree <dict'> dup length dict exch { dup type /dicttype eq { .copytree } if 2 index 3 1 roll put } forall } bind def /currentpagedevice { .currentpagedevice { dup length 0 eq { pop //.makecurrentpagedevice exec } { % If any of the dynamic keys have changed, % we must update the page device dictionary. currentdevice //.volatilepdkeys .getdeviceparams .dicttomark { % Stack: current key value 2 index 2 index .knownget { 1 index ne } { //true } ifelse { 2 index wcheck not { % This is the first entry being updated. % Copy the dictionary to make it writable. 3 -1 roll currentglobal 1 index dup gcheck currentglobal and setglobal length dict exch setglobal .copydict 3 1 roll } if 2 index 3 1 roll put } { pop pop } ifelse } forall % If the device is the distiller device, update distillerparams that % may have been changed by setdistillerparams /IsDistiller /GetDeviceParam .special_op { exch pop }{ //false }ifelse { currentdistillerparams { % Stack: current key value 2 index 2 index .knownget { 1 index ne } { //true } ifelse { 2 index 3 1 roll put } { pop pop } ifelse } forall } if % If the dictionary was global and is now local, copy % any global subsidiary dictionaries to local VM. This % too is to work around the Word Perfect bug (see above). dup gcheck not { dup { dup type /dicttype eq { dup gcheck } { //false } ifelse { % Copy-on-write, see above. 2 index wcheck not { 3 -1 roll dup length dict .copydict 3 1 roll } if //.copytree exec 2 index 3 1 roll put } { pop pop } ifelse } forall } if % We would like to do a .setpagedevice so we don't keep % re-creating the dictionary. Unfortunately, the effect % of this is that if any dynamic key changes (PageCount % in particular), we will do the equivalent of a % setpagedevice at the next restore or grestore. % Therefore, we make the dictionary read-only, but % we don't store it away. I.e., NOT: % dup wcheck { .setpagedevice .currentpagedevice pop } if readonly } ifelse } if } bind odef % Define access to device defaults. /.defaultdeviceparams { finddevice //null .getdeviceparams } bind def % Select media (input or output). The hard work is done in an operator: % <pagedict> <attrdict> <policydict> <keys> .matchmedia <key> true % <pagedict> <attrdict> <policydict> <keys> .matchmedia false % <pagedict> null <policydict> <keys> .matchmedia null true /.selectmedia % <orig> <request> <merged> <failed> <-- retained % <attrdict> <policydict> <attrkeys> <mediakey> % .selectmedia { 5 index 5 -2 roll 4 index .matchmedia % Stack: orig request merged failed attrkeys mediakey % (key true | false) { 4 index 3 1 roll put pop } { % Adobe's implementations have a "big hairy heuristic" % to choose the set of keys to report as having failed the match. % For the moment, we report any keys that are in the request % and don't have the same value as in the original dictionary. 5 index 1 index .knownget { 4 index 3 1 roll put } { 3 index exch .undef } ifelse { % Stack: <orig> <request> <merged> <failed> <attrkey> 3 index 1 index .knownget { 5 index 2 index .knownget { ne } { pop //true } ifelse } { //false } ifelse % Stack: ... <failed> <attrkey> <report> { 2 copy /rangecheck put } if pop } forall } ifelse } bind def % Apply Policies to any unprocessed failed requests. % As we process each request entry, we replace the error name % in the <failed> dictionary with the policy value, % and we replace the key in the <merged> dictionary with its prior value % (or remove it if it had no prior value). % These procedures are called with the following on the stack: % <orig> <merged> <failed> <Policies> <key> <policy> % They are expected to consume the top 2 operands. % NOTE: we currently treat all values other than 0, 1, or 7 (for PageSize) % the same as 0, i.e., we signal an error. /0Policy { % Set errorinfo and signal a configurationerror. NOMEDIAATTRS { % NOMEDIAATTRS means that the default policy is 7... pop 2 index exch 7 put } { pop dup 4 index exch get 2 array astore $error /errorinfo 3 -1 roll put cleartomark /setpagedevice .systemvar /configurationerror signalerror } ifelse } bind executeonly odef % Making this an operator means we can properly hide % the contents - specifically .forceput /1Policy { % Roll back the failed request to its previous status. SETPDDEBUG { (Rolling back.) = pstack flush } if 3 index 2 index 3 -1 roll .forceput 4 index 1 index .knownget { 4 index 3 1 roll .forceput } executeonly { 3 index exch .undef } ifelse } bind executeonly odef /7Policy { % For PageSize only, just impose the request. 1 index /PageSize eq { pop pop 1 index /PageSize 7 put } { .policyprocs 0 get exec } ifelse } bind executeonly odef /.applypolicies % <orig> <merged> <failed> .applypolicies % <orig> <merged'> <failed'> { 1 index /Policies get 1 index { type /integertype eq { pop % already processed }{ 2 copy .knownget not { 1 index /PolicyNotFound get } if % Stack: <orig> <merged> <failed> <Policies> <key> % <policy> dup 1 eq { 1Policy }{ dup 7 eq { 7Policy }{ 0Policy } ifelse } ifelse } ifelse } forall pop } bind executeonly odef currentdict /0Policy undef currentdict /1Policy undef currentdict /7Policy undef % Put device parameters without resetting currentpagedevice. % (.putdeviceparams clears the current page device.) /.putdeviceparamsonly % <device> <Policies|null> <require_all> -mark- % <key1> <value1> ... .putdeviceparamsonly % On success: <device> <eraseflag> % On failure: <device> <Policies|null> <req_all> -mark- % <key1> <error1> ... { .currentpagedevice { counttomark 4 add 1 roll .putdeviceparams dup type /booleantype eq { 3 } { counttomark 5 add } ifelse -1 roll .setpagedevice } { pop .putdeviceparams } ifelse } bind def /.postinstall { % mark ... <failed> <merged> .postinstall - matrix currentmatrix .setdefaultmatrix % Erase and initialize the page. initgraphics currentoverprint //false setoverprint 1 setcolor .fillpage 0 setcolor setoverprint .beginpage % Clean up, calling PolicyReport if needed. % Stack: mark ... <failed> <merged> SETPDDEBUG { (Finishing.) = pstack flush } if exch dup length 0 ne { 1 index /Policies get /PolicyReport get counttomark 1 add 2 roll cleartomark exec } { cleartomark } ifelse pop } def % ---------------- setpagedevice itself ---------------- % /setpagedevice { % To avoid VM mismatches caused by copying subsidiary % dictionaries to local VM (see WorPerfect bug in % .makecurrentpagedevice) we want to make the dict % returned by currentpagedevice local. However, if we % run with -dSAFER we get a call to setpagedevice from % .setsafe in gs_init.ps during startup. The dict returned % by currentpagdevice is stored to the graphics state by % .setpagedevice below, and returned by currentpagdevice. % The Display PostScript code insists that the savedinitialgstate % not have any pointers to local VM objects, so if we simply % make the dict local then we fail in gs_dps.ps. The only % solution is to make sure the VM mode is global during % startup (to satisfy gs_dps.ps) and local thereafter % (to satisfy the WordPerfect bug). dup /..StartupGlobal known { currentglobal exch //true setglobal dup /..StartupGlobal undef } { % ensure that we are always in local VM mode to avoid % mismatches. This is because we always create child % dictionaries in local VM, regardless of the current VM state, % (see .makecurrentpagdevice) and we can't store local objects % in a global object, so we must ensure teh dictionary returned % from currentpagedevice is in local VM. currentglobal exch //false setglobal } ifelse %% We used to execute endpage after .tsrysetparams, but that actually alters %% the page device dictionary (in particular /PageSize) this is not correct. %% Testing with Adobe Acrobat Distiller shows that EndPage is ececuted if the %% page device dictionary is empty, and indeed even if setpagedevice returns %% an error (caught by stopped), so it seems pretty clear that we should %% run any required EndPage very early in the setpagedevice process. %% Bug 690667. 2 .endpage { 1 //true .outputpage (>>setpagedevice, press <return> to continue<<\n) //.confirm exec } if % We mustn't pop the argument until the very end, % so that the pseudo-operator machinery can restore the stack % if an error occurs. mark 1 index currentpagedevice % Check whether we are changing OutputDevice; % also handle the case where the current device % is not a page device. % Stack: mark <request> <current> SETPDDEBUG { (Checking.) = pstack flush } if dup /OutputDevice .knownget { % Current device is a page device. 2 index /OutputDevice .knownget { % A specific OutputDevice was requested. 2 copy eq { pop pop //null } { exch pop } ifelse } { pop //null } ifelse } { % Current device is not a page device. % Use the default device. 1 index /OutputDevice .knownget not { .defaultdevicename } if } ifelse dup //null eq { pop } { exch pop //.defaultdeviceparams exec % In case of duplicate keys, .dicttomark takes the entry % lower on the stack, so we can just append the defaults here. //.requiredattrs { exec } forall .dicttomark } ifelse % Check whether a viewer wants to intervene. % We must check both the request (which takes precedence) % and the current dictionary. % Stack: mark <request> <orig> exch dup /ViewerPreProcess .knownget { exec } { 1 index /ViewerPreProcess .knownget { exec } if } ifelse exch % Construct a merged request from the actual request plus % any keys that should always be propagated. % Stack: mark <request> <orig> SETPDDEBUG { (Merging.) = pstack flush } if exch 1 index length 1 index length add dict .copiedkeys { % Stack: <orig> <request> <merged> <key> 3 index 1 index .knownget { 3 copy put pop } if pop } forall % Stack: <orig> <request> <merged> dup 2 index { % stack: <orig> <request> <merged> <merged> <rkey> <rvalue> //.mergespecial 2 index .knownget { exec } if put dup } forall pop % Hack: if FIXEDRESOLUTION is true, discard any attempt to % change HWResolution. FIXEDRESOLUTION { dup /HWResolution .undef } if % Hack: if FIXEDMEDIA is true, discard any attempt to change % PageSize or HWSize unless the PageSize Policy 13 (for FitPage). dup /Policies get /PageSize get 13 ne FIXEDMEDIA and { dup /PageSize 4 index /PageSize get put dup /HWSize 4 index /HWSize get put } if % Hack: to work around some files that take a PageSize % from InputAttributes and impose it, discard any attempt % to set PageSize to a 4-element value. % Stack: mark <orig> <request> <merged> dup /PageSize .knownget { length 2 ne { dup /PageSize 4 index /PageSize get put } if } if % Select input and output media. % Stack: mark <orig> <request> <merged> SETPDDEBUG { (Selecting.) = pstack flush } if 0 dict % <failed> 1 index /InputAttributes .knownget { 2 index /Policies get .inputattrkeys (%MediaSource) cvn //.selectmedia exec } if 1 index /OutputAttributes .knownget { 2 index /Policies get .outputattrkeys (%MediaDestination) cvn //.selectmedia exec } if 3 -1 roll 4 1 roll % temporarily swap orig & request .applypolicies 3 -1 roll 4 1 roll % swap back % Construct the new device, and attempt to set its attributes. % Stack: mark <orig> <request> <merged> <failed> SETPDDEBUG { (Constructing.) = pstack flush } if % Non-obvious: we need to check the name of the output device, to tell % whether we're going to have to replace the entire device chain (which % may be only one device, or may be multiple devices. % If we're not replacing the entire change, we have to use the device in % the graphics state, so the configuration of the entire device chain is % correctly set. .currentoutputdevice .devicename 2 index /OutputDevice get eq { currentdevice } { 1 index /OutputDevice get finddevice } ifelse %**************** We should copy the device here, %**************** but since we can't close the old device, %**************** we don't. This is WRONG. %****************copydevice 2 index /Policies get //.trysetparams dup type /booleantype ne { % The request failed. % Stack: ... <orig> <request> <merged> <failed> <device> % <Policies> true mark <name> <errorname> ... SETPDDEBUG { (Recovering.) = pstack flush } if counttomark 4 add index counttomark 2 idiv { dup 4 -2 roll put } repeat pop pop pop % Stack: mark ... <orig> <request> <merged> <failed> <device> % <Policies> 6 2 roll 3 -1 roll 4 1 roll .applypolicies 3 -1 roll 4 1 roll 6 -2 roll //.trysetparams % shouldn't fail! dup type /booleantype ne { 2 { counttomark 1 add 1 roll cleartomark } repeat /setpagedevice .systemvar exch signalerror } if } if % The attempt succeeded. Install the new device. % Stack: mark ... <merged> <failed> <device> <eraseflag> SETPDDEBUG { (Installing.) = pstack flush } if pop % .setdevice clears the current page device! .currentpagedevice pop exch { .setdevice } stopped { cleartomark exch pop /setpagedevice $error /errorname get signalerror } if pop .setpagedevice % Implement UseCIEColor directly if this is a LL3 system. % The color substitution feature is now implemented in % the interpreter, and this is used as an optimization. % % NB: This shoud be the only use of the .setuseciecolor % operator anywhere. % % Set some color space other than /DeviceGray, to insure % that initgraphics will actually perform a setcolorspace % operation (there is an optimization in setcolorspace % that does nothing if the operand and current color % spaces are the same) /.setuseciecolor where { pop 1 index /UseCIEColor .knownget { .setuseciecolor /DeviceRGB setcolorspace } if } if % Merge the request into the current page device, % unless we're changing the OutputDevice. % Stack: mark ... <merged> <failed> exch currentpagedevice dup length 2 index length add dict % Stack: mark ... <failed> <merged> <current> <newdict> 2 index /OutputDevice .knownget { 2 index /OutputDevice .knownget not { //null } if eq } { //true } ifelse { % Same OutputDevice, merge the dictionaries. .copydict } { % Different OutputDevice, discard the old dictionary. exch pop } ifelse .copydict % Initialize the default matrix, taking media matching % into account. //.computemediasize exec pop initmatrix concat dup /PageOffset .knownget { % Translate by the given number of 1/72" units in device X/Y. dup 0 get exch 1 get 2 index /HWResolution get dup 1 get exch 0 get 4 -1 roll mul 72 div 3 1 roll mul 72 div idtransform translate } if % We must install the new page device dictionary % before calling the Install procedure. dup .setpagedevice /HighLevelDevice /GetDeviceParam .special_op { exch pop not }{ //true }ifelse { .setdefaulthalftone % Set the default screen before calling Install. } if dup /Install .knownget { { .execinstall } stopped { pop % Install procedure failed. One element will have been left on the stack. % stack: mark <orig> <request> <failed> <merged> 1 index /Install $error /errorname get put % Put it in the "failed" dict % .applypolicies needs stack: <orig> <merged> <failed> exch 4 2 roll exch 4 2 roll .applypolicies exch 4 2 roll exch 4 2 roll % Now execute the old Install -- failures after this are not handled dup /Install .knownget { { .execinstall } stopped { pop } if } if //.postinstall exec stop } { //.postinstall exec } ifelse } { //.postinstall exec } ifelse setglobal % return to original VM allocation mode } bind executeonly odef % We break out the code after calling the Install procedure into a % separate procedure, since it is executed even if Install causes an error. % By making .execinstall a separate operator procedure, we get the stacks % mostly restored if it fails, except for one element (the operand). % Thus if it fails, there will be one element left on the op stack. /.execinstall { % <proc> .execinstall - dup % element left on the stack if the exec fails. % Because the interpreter optimizes tail calls, we can't just let % the body of this procedure be 'exec', because that would lose % the stack protection that is the whole reason for having the % procedure in the first place. The 'pop' for the dummy element % on the op stack suffices. exec pop % See above. } odef [ /.computemediasize /.prepareparams /.selectmedia /.trysetparams /.installpagedevice /.postinstall /.copytree /.defaultdeviceparams /.makecurrentpagedevice /.mergespecial /.requiredattrs % /.uninstallpagedevice % (called from C code) ] {currentdict exch .forceundef} forall end % level2dict .setlanguagelevel
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