Subversion Repositories filter_foundry

/*

    This file is part of "Filter Foundry", a filter plugin for Adobe Photoshop

    Copyright (C) 2003-2009 Toby Thain, toby@telegraphics.com.au

    Copyright (C) 2018-2021 Daniel Marschall, ViaThinkSoft

    This program is free software; you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation; either version 2 of the License, or

    (at your option) any later version.

    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License

    along with this program; if not, write to the Free Software

    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/

//#include <stdio.h>

//#include <sound.h>

#include "ff.h"

#include "node.h"

#include "funcs.h"

#include "y.tab.h"

#include "scripting.h"

#include <math.h>

#include "PIBufferSuite.h"

// GIMP (PSPI) and IrfanView preserve neither *data(gdata), nor pb->parameters between invocations!

// For debugging, we can simulate it here

//#define DEBUG_SIMULATE_GIMP

// Used to find out which host signatures and memory settings a plugin host has

//#define SHOW_HOST_DEBUG

struct node *tree[4];

char *err[4];

int errpos[4],errstart[4],nplanes,cnvused,chunksize,toprow;

uint8_t slider[8],map[4][0x100];

value_type cell[NUM_CELLS];

char *expr[4];

// long maxSpace;

globals_t *gdata;

FilterRecordPtr gpb;

#ifdef MAC_ENV

        #define HINSTANCE HANDLE

        #define hDllInstance NULL /* fake this Windows-only global */

#endif

#ifdef WIN_ENV

#include "manifest.h"

#endif

extern struct sym_rec predefs[];

extern int nplanes,varused[];

int checkandinitparams(Handle params);

// MPW MrC requires prototype

DLLEXPORT MACPASCAL

void ENTRYPOINT(short selector,FilterRecordPtr pb,intptr_t *data,short *result);

unsigned long get_parm_hash(PARM_T *parm) {

        unsigned long hash;

        int i;

        hash = djb2((char*)parm->category);

        hash += djb2((char*)parm->title);

        hash += djb2((char*)parm->copyright);

        hash += djb2((char*)parm->author);

        for (i = 0; i < 4; i++) hash += hash += djb2((char*)parm->map[i]);

        for (i = 0; i < 8; i++) hash += hash += djb2((char*)parm->ctl[i]);

        for (i = 0; i < 4; i++) hash += hash += djb2((char*)parm->formula[i]);

        return hash;

}

void get_temp_afs(char *outfilename, Boolean isStandalone, PARM_T *parm) {

        char* tempdir;

        int hash;

        tempdir = getenv("TMP");

        #ifdef WIN_ENV

        if (strlen(tempdir) > 0) strcat(tempdir, "\\");

        #else

        if (strlen(tempdir) > 0) strcat(tempdir, "/");

        #endif

        hash = (isStandalone) ? get_parm_hash(parm) : 0;

        sprintf(outfilename, "%sFilterFoundry%d.afs", tempdir, hash);

}

DLLEXPORT MACPASCAL

void ENTRYPOINT(short selector, FilterRecordPtr pb, intptr_t *data, short *result){

        static Boolean wantdialog = false;

        static Boolean premiereWarnedOnce = false;

        OSErr e = noErr;

        char *reason;

        #ifdef SHOW_HOST_DEBUG

        char* tmp;

        #endif

        #ifdef WIN_ENV

        // For Windows, we use an activation context to enforce that our Manifest resource will

        // be used. This allows us to use Visual Styles, even if the host application does not

        // support it.

        ManifestActivationCtx manifestVars;

        BOOL activationContextUsed;

        #endif

        // ---------------------------------------------------------------------

        EnterCodeResource();

        #ifdef WIN_ENV

        // The first 64KB of address space is always invalid

        if ((intptr_t)result <= 0xffff) {

                // When the 8BF file is analyzed with VirusTotal.com, it will invoke each

                // exported function by calling

                //    C:\Windows\System32\rundll32.exe rundll32.exe FilterFoundry.8bf,PluginMain

                // But RunDLL32 requires following signature:

                //    void CALLBACK EntryPoint(HWND hwnd, HINSTANCE hinst, LPSTR lpszCmdLine, int nCmdShow);

                // Obviously, this will cause an Exception. (It crashes at *result=e because result is 0xA)

                // Here is the problem: The crash will be handled by WerFault.exe inside the

                // VirusTotal virtual machine. WerFault connects to various servers (9 DNS resolutions!) and does

                // a lot of weird things, but VirusTotal thinks that our plugin does all that stuff,

                // and so they mark our plugin as "malware"!

                // This is a problem with VirusTotal! It shall not assume that WerFault.exe actions are our actions!

                // Even processes like "MicrosoftEdgeUpdate.exe" and "SpeechRuntime.exe" are reported to be our

                // actions, although they have nothing to do with us!

                // See https://www.virustotal.com/gui/file/1f1012c567208186be455b81afc1ee407ae6476c197d633c70cc70929113223a/behavior

                // 

                // TODO: Not 100% sure if the calling convention is correct...

                //       are we corrupting the stack? At least WER isn't triggered...

                return;

        }

        #endif

        #ifdef SHOW_HOST_DEBUG

        tmp = (char*)malloc(512);

        sprintf(tmp, "Host signature: '%c%c%c%c' (%d)\nMaxSpace32 = %d\nMaxSpace64 = %lld\nNum buffer procs: %d", (pb->hostSig >> 24) & 0xFF, (pb->hostSig >> 16) & 0xFF, (pb->hostSig >> 8) & 0xFF, pb->hostSig & 0xFF, pb->hostSig, pb->maxSpace, pb->maxSpace64, pb->bufferProcs->numBufferProcs);

        simplealert(tmp);

        #endif

        if (pb->hostSig == HOSTSIG_ADOBE_PREMIERE) {

                // DM 19.07.2021 : Tried running the 8BF file in Adobe Premiere 5 (yes, that's possible,

                // and there is even a FilterFactory for Premeire!),

                // but it crashes in evalpixel() where there is write-access to the "outp".

                // Probably the canvas structure is different (maybe it contains frames to achieve transitions?)

                if (!premiereWarnedOnce) {

                        simplealert(_strdup("This version of Filter Foundry is not compatible with Adobe Premiere!"));

                }

                premiereWarnedOnce = true;

                *result = errPlugInHostInsufficient;

                return;

        }

        #ifdef DEBUG_SIMULATE_GIMP

        *data = 0;

        pb->parameters = pb->handleProcs->newProc(1);

        #endif

        // Register "gdata" that contains the PARM information and other things which need to be persistant

        // and preserve then in *data

        // TODO: memory leak? where is the stuff freed?

        if (selector != filterSelectorAbout && !*data) {

                /*

                PSBufferSuite1* pSBufferSuite32 = NULL;

                if ((pb->sSPBasic == 0) ||

                        (pb->sSPBasic->AcquireSuite(kPSBufferSuite, kPSBufferSuiteVersion1, (const void**)&pSBufferSuite32)) ||

                        (pSBufferSuite32 == NULL))

                {

                                // Old deprecated buffer suite

                                BufferID tempId;

                                if ((*result = pb->bufferProcs->allocateProc(sizeof(globals_t), &tempId))) return;

                                *data = (intptr_t)pb->bufferProcs->lockProc(tempId, true);

                                gdata = (globals_t*)*data;

                }

                else

                {

                                // New buffer suite (but only 32-bit version 1, because version 2 has problems with old Photoshop versions)

                                // Windows Photoshop 7 and CS 2 accepts kPSBufferSuiteVersion2, but doesn't correctly implement it:

                                // The symbols "New" and "GetSpace64" point to memory memory addresses outside the Photoshop.exe address range.

                                // (Other Photoshop versions were not tested.)

                                // 64-bit support for Windows was established in Photoshop CS 4,

                                // and PSBufferSuite2 was first documented in SDK CS 6.

                                // So, kPSBufferSuiteVersion2 probably was partically implemented as hidden "Work in progress" version

                                // before it was publicly documented.

                                // Side note:  pb->bufferSpace64/pb->maxSpace64 was documented in SDK CC 2017.

                                //             pb->bufferProcs->allocateProc64/spaceProc64 was documented in SDK CS 6.

                                unsigned32 siz = sizeof(globals_t);

                                *data = (intptr_t)pSBufferSuite32->New(&siz, siz);

                                if ((*data == 0) || (siz == 0)) {

                                                *result = errPlugInHostInsufficient; // TODO: what is the correct error code for "out of memory"?

                                                return;

                                }

                                gdata = (globals_t*)*data;

                                pb->sSPBasic->ReleaseSuite(kPSBufferSuite, kPSBufferSuiteVersion1);

                }

                gdata->standalone = gdata->parmloaded = false;

                */

                // We have 3 options:

                // - The deprecated buffer suite (pb->bufferProcs), works fine

                // - The recommended buffer suite (kPSBufferSuite), does NOT work (causes memory corruption?) and is not available on some hosts!

                //   Either I do something wrong, or maybe it cannot be used to store data between invocations?

                // - Using malloc(), which works also fine and is more independent from the host and easier

                *data = (intptr_t)malloc(sizeof(globals_t));

                if (*data == 0) return;

                gdata = (globals_t*)*data;

                gdata->standalone = gdata->parmloaded = false; // they will be set later

        }

        else {

                // We have data from the previous invocation. Use it instead

                gdata = (globals_t*)*data;

        }

        #ifdef WIN_ENV

        activationContextUsed = ActivateManifest((HMODULE)hDllInstance, 1, &manifestVars);

        #endif

        gpb = pb;

        nplanes = MIN(pb->planes,4);

        switch (selector){

        case filterSelectorAbout:

                if (!gdata) {

                        gdata = (globals_t*)malloc(sizeof(globals_t));

                        if (!gdata) break;

                        gdata->standalone = gdata->parmloaded = readPARMresource((HMODULE)hDllInstance,&reason,READ_OBFUSC);

                        if (gdata->parmloaded && (gdata->parm.cbSize != PARM_SIZE) && (gdata->parm.cbSize != PARM_SIZE_PREMIERE) && (gdata->parm.cbSize != PARM_SIG_MAC)) {

                                if (gdata->obfusc) {

                                        simplealert(_strdup("Incompatible obfuscation."));

                                }

                                else {

                                        simplealert(_strdup("Invalid parameter data."));

                                }

                        }

                        else {

                                DoAbout((AboutRecordPtr)pb);

                        }

                        free(gdata);

                        gdata = NULL;

                } else {

                        DoAbout((AboutRecordPtr)pb);

                }

                break;

        case filterSelectorParameters:

                wantdialog = true;

                break;

        case filterSelectorPrepare:

                DoPrepare(pb);

                init_symtab(predefs); // ready for parser calls

                init_trigtab();

                break;

        case filterSelectorStart:

                if (HAS_BIG_DOC(pb)) {

                        // The BigDocument structure is required if the document is larger than 30,000 pixels

                        // It deprecates imageSize, filterRect, inRect, outRect, maskRect, floatCoord, and wholeSize.

                        // By setting it to nonzero, we communicate to Photoshop that we support the BigDocument structure.

                        pb->bigDocumentData->PluginUsing32BitCoordinates = true;

                }

                /* initialise the parameter handle that Photoshop keeps for us */

                if(!pb->parameters)

                        pb->parameters = PINEWHANDLE(1); // don't set initial size to 0, since some hosts (e.g. GIMP/PSPI) are incompatible with that.

                wantdialog |= checkandinitparams(pb->parameters);

                /* wantdialog = false means that we never got a Parameters call, so we're not supposed to ask user */

                if( wantdialog && (!gdata->standalone || gdata->parm.popDialog) ){

                        if( maindialog(pb) ){

                                if (!host_preserves_parameters()) {

                                        /* Workaround for GIMP/PSPI, to avoid that formulas vanish when you re-open the main window.

                                           The reason is a bug in PSPI: The host should preserve the value of pb->parameters, which PSPI does not do.

                                           Also, all global variables are unloaded, so the plugin cannot preserve any data.

                                           Workaround in FF 1.7: If the host GIMP is detected, then a special mode will be activated.

                                           This mode saves the filter data into a temporary file "FilterFoundryXX.afs" and loads it

                                           when the window is opened again. */

                                        // Workaround: Save settings in "FilterFoundryXX.afs" if the host does not preserve pb->parameters

                                        char outfilename[255];

                                        StandardFileReply sfr;

                                        char* bakexpr[4];

                                        sfr.sfGood = true;

                                        sfr.sfReplacing = true;

                                        sfr.sfType = PS_FILTER_FILETYPE;

                                        get_temp_afs(&outfilename[0], gdata->standalone, &gdata->parm);

                                        myc2pstrcpy(sfr.sfFile.name, outfilename);

                                        #ifdef WIN_ENV

                                        sfr.nFileExtension = (WORD)(strlen(outfilename) - strlen(".afs") + 1);

                                        #endif

                                        sfr.sfScript = 0; // FIXME: is that ok?

                                        // We only want the parameters (ctl,map) in the temporary .afs file

                                        // It is important to remove the expressions, otherwise they would be

                                        // revealed in the temporary files.

                                        bakexpr[0] = expr[0]; // moved out of the if-definition to make the compiler happy

                                        bakexpr[1] = expr[1];

                                        bakexpr[2] = expr[2];

                                        bakexpr[3] = expr[3];

                                        if (gdata->standalone) {

                                                expr[0] = _strdup("r");

                                                expr[1] = _strdup("g");

                                                expr[2] = _strdup("b");

                                                expr[3] = _strdup("a");

                                        }

                                        savefile_afs_pff(&sfr);

                                        if (gdata->standalone) {

                                                free(expr[0]); expr[0] = bakexpr[0];

                                                free(expr[1]); expr[1] = bakexpr[1];

                                                free(expr[2]); expr[2] = bakexpr[2];

                                                free(expr[3]); expr[3] = bakexpr[3];

                                        }

                                } else {

                                        /* update stored parameters from new user settings */

                                        saveparams(pb->parameters);

                                }

                        }else

                                e = userCanceledErr;

                }

                wantdialog = false;

                if(!e){

                        if(setup(pb)){

                                DoStart(pb);

                        }else{

                                SYSBEEP(1);

                                e = filterBadParameters;

                        }

                }

                break;

        case filterSelectorContinue:

                e = DoContinue(pb);

                break;

        case filterSelectorFinish:

                DoFinish(pb);

                break;

        default:

                e = filterBadParameters;

        }

        *result = e;

        #ifdef WIN_ENV

        if (activationContextUsed) DeactivateManifest(&manifestVars);

        #endif

        ExitCodeResource();

}

int checkandinitparams(Handle params){

        char *reasonstr,*reason;

        int i,bUninitializedParams;

        Boolean showdialog;

        if (!host_preserves_parameters()) {

                // Workaround: Load settings in "FilterFoundryXX.afs" if host does not preserve pb->parameters

                char outfilename[255];

                Boolean isStandalone;

                StandardFileReply sfr;

                char* bakexpr[4];

                sfr.sfGood = true;

                sfr.sfReplacing = true;

                sfr.sfType = PS_FILTER_FILETYPE;

                // We need to set gdata->standalone after loadfile(), but we must call readPARMresource() before loadfile()

                // Reason: readPARMresource() reads parameters from the DLL while loadfile() reads parameters from the AFS file

                // But loadfile() will reset gdata->standalone ...

                isStandalone = readPARMresource((HMODULE)hDllInstance, &reason, READ_OBFUSC);

                if (isStandalone && (gdata->parm.cbSize != PARM_SIZE) && (gdata->parm.cbSize != PARM_SIZE_PREMIERE) && (gdata->parm.cbSize != PARM_SIG_MAC)) {

                        if (gdata->obfusc) {

                                simplealert(_strdup("Incompatible obfuscation."));

                        }

                        else {

                                simplealert(_strdup("Invalid parameter data."));

                        }

                        gdata->parmloaded = false;

                        return false;

                }

                get_temp_afs(&outfilename[0], isStandalone, &gdata->parm);

                myc2pstrcpy(sfr.sfFile.name, outfilename);

                #ifdef WIN_ENV

                sfr.nFileExtension = (WORD)(strlen(outfilename) - strlen(".afs") + 1);

                #endif

                sfr.sfScript = 0; // FIXME: is that ok?

                // We only want the parameters (ctl,map) in the temporary .afs file

                if (isStandalone) {

                        bakexpr[0] = my_strdup(expr[0]);

                        bakexpr[1] = my_strdup(expr[1]);

                        bakexpr[2] = my_strdup(expr[2]);

                        bakexpr[3] = my_strdup(expr[3]);

                }

                if (loadfile(&sfr, &reason)) {

                        gdata->standalone = gdata->parmloaded = isStandalone;

                        if (isStandalone) {

                                free(expr[0]); expr[0] = bakexpr[0];

                                free(expr[1]); expr[1] = bakexpr[1];

                                free(expr[2]); expr[2] = bakexpr[2];

                                free(expr[3]); expr[3] = bakexpr[3];

                        }

                        return true;

                }

        }

        if( (bUninitializedParams = !(params && readparams(params,false,&reasonstr))) ){

                /* either the parameter handle was uninitialised,

                   or the parameter data couldn't be read; set default values */

                // see if saved parameters exist

                gdata->standalone = gdata->parmloaded = readPARMresource((HMODULE)hDllInstance,&reason,READ_OBFUSC);

                if (gdata->parmloaded && (gdata->parm.cbSize != PARM_SIZE) && (gdata->parm.cbSize != PARM_SIZE_PREMIERE) && (gdata->parm.cbSize != PARM_SIG_MAC)) {

                        if (gdata->obfusc) {

                                simplealert(_strdup("Incompatible obfuscation."));

                        }

                        else {

                                simplealert(_strdup("Invalid parameter data."));

                        }

                        gdata->parmloaded = false;

                        return false;

                }

                if(!gdata->standalone){

                        // no saved settings (not standalone)

                        for(i = 0; i < 8; ++i)

                                slider[i] = i*10+100;

                        for(i = 0; i < 4; ++i)

                                if(expr[i])

                                        free(expr[i]);

                        if(gpb->imageMode == plugInModeRGBColor){

                                expr[0] = _strdup("r");

                                expr[1] = _strdup("g");

                                expr[2] = _strdup("b");

                                expr[3] = _strdup("a");

                        }else{

                                expr[0] = _strdup("c");

                                expr[1] = _strdup("c");

                                expr[2] = _strdup("c");

                                expr[3] = _strdup("c");

                        }

                }

        }

        // let scripting system change parameters, if we're scripted;

        // user may want to force display of dialog during scripting playback

        switch (ReadScriptParamsOnRead()) {

        case SCR_SHOW_DIALOG:

                showdialog = true;

                break;

        case SCR_HIDE_DIALOG:

                showdialog = false;

                break;

        default:

        case SCR_NO_SCRIPT:

                showdialog = bUninitializedParams;

                break;

        }

        saveparams(params);

        return showdialog;

}

Boolean host_preserves_parameters() {

        #ifdef DEBUG_SIMULATE_GIMP

        return false;

        #endif

        if (gpb->hostSig == HOSTSIG_GIMP) return false;

        if (gpb->hostSig == HOSTSIG_IRFANVIEW) return false;

        // We just assume the other hosts preserve the parameters

        return true;

}

int64_t maxspace(){

        // Please see "Hosts.md" for details about the MaxSpace implementations of tested plugins

        // Plugins that don't support MaxSpace64 shall set the field to zero; then we will use MaxSpace instead.

        // Also check "gpb->bufferProcs->numBufferProcs" to see if 64 bit API is available

        if ((gpb->bufferProcs->numBufferProcs >= 8) && (gpb->maxSpace64 > 0)) {

                uint64_t maxSpace64 = gpb->maxSpace64;

                return maxSpace64;

        } else {

                // Note: If maxSpace gets converted from Int32 to unsigned int, we can reach up to 4 GB RAM. However, after this, there will be a wrap to 0 GB again.

                unsigned int maxSpace32 = (unsigned int) gpb->maxSpace;

                uint64_t maxSpace64 = maxSpace32;

                if (gpb->hostSig == HOSTSIG_IRFANVIEW) maxSpace64 *= 1024; // IrfanView is giving Kilobytes instead of Bytes

                //if (gpb->hostSig == HOSTSIG_SERIF_PHOTOPLUS) maxSpace64 *= 1024; // TODO: Serif PhotoPlus also gives Kilobytes instead of bytes. But since it uses not a unique host signature, there is nothing we can do???

                return maxSpace64;

        }

}

Boolean maxspace_available() {

        // Please see "Hosts.md" for details about the MaxSpace implementations of tested plugins

        // GIMP PSPI sets MaxSpace to hardcoded 100 MB

        if (gpb->hostSig == HOSTSIG_GIMP) return false;

        // HOSTSIG_PAINT_NET sets MaxSpace to hardcoded 1 GB, see https://github.com/0xC0000054/PSFilterPdn/issues/5

        // Comment by the host author "This was done to avoid any compatibility issues with plugins handling 2 GB - 1"

        if (gpb->hostSig == HOSTSIG_PAINT_NET) return false;

        return true;

}

void DoPrepare(FilterRecordPtr pb){

        int i;

        for(i = 4; i--;){

                if(expr[i]||tree[i]) DBG("expr[] or tree[] non-NULL in Prepare!");

                expr[i] = NULL;

                tree[i] = NULL;

        }

        // Commented out by DM, 18 Dec 2018:

        // This code did not work on systems with 8 GB RAM:

        /*

        long space = (pb->maxSpace*9)/10; // don't ask for more than 90% of available memory

        maxSpace = 512L<<10; // this is a wild guess, actually

        if(maxSpace > space)

                        maxSpace = space;

        pb->maxSpace = maxSpace;

        */

        // New variant:

        if (maxspace_available()) {

                pb->maxSpace = (int32)ceil((maxspace()/10.)*9); // don't ask for more than 90% of available memory

                // FIXME: Also maxSpace64

        }

}

void RequestNext(FilterRecordPtr pb,long toprow){

        /* Request next block of the image */

        pb->inLoPlane = pb->outLoPlane = 0;

        pb->inHiPlane = pb->outHiPlane = nplanes-1;

        if (HAS_BIG_DOC(pb)) {

                // if any of the formulae involve random access to image pixels,

                // ask for the entire image

                if (needall) {

                        SETRECT(BIGDOC_IN_RECT(pb), 0, 0, BIGDOC_IMAGE_SIZE(pb).h, BIGDOC_IMAGE_SIZE(pb).v);

                } else {

                        // TODO: This does not work with GIMP. So, if we are using GIMP, we should

                        //       somehow always use "needall=true", and/or find out why this doesn't work

                        //       with GIMP.

                        // otherwise, process the filtered area, by chunksize parts

                        BIGDOC_IN_RECT(pb).left = BIGDOC_FILTER_RECT(pb).left;

                        BIGDOC_IN_RECT(pb).right = BIGDOC_FILTER_RECT(pb).right;

                        BIGDOC_IN_RECT(pb).top = (int32)toprow;

                        BIGDOC_IN_RECT(pb).bottom = (int32)MIN(toprow + chunksize, BIGDOC_FILTER_RECT(pb).bottom);

                        if (cnvused) {

                                // cnv() needs one extra pixel in each direction

                                if (BIGDOC_IN_RECT(pb).left > 0)

                                        --BIGDOC_IN_RECT(pb).left;

                                if (BIGDOC_IN_RECT(pb).right < BIGDOC_IMAGE_SIZE(pb).h)

                                        ++BIGDOC_IN_RECT(pb).right;

                                if (BIGDOC_IN_RECT(pb).top > 0)

                                        --BIGDOC_IN_RECT(pb).top;

                                if (BIGDOC_IN_RECT(pb).bottom < BIGDOC_IMAGE_SIZE(pb).v)

                                        ++BIGDOC_IN_RECT(pb).bottom;

                        }

                }

                BIGDOC_OUT_RECT(pb) = BIGDOC_FILTER_RECT(pb);

                /*

                {char s[0x100];sprintf(s,"RequestNext needall=%d inRect=(%d,%d,%d,%d) filterRect=(%d,%d,%d,%d)",

                                needall,

                                BIGDOC_IN_RECT(pb).left,BIGDOC_IN_RECT(pb).top,BIGDOC_IN_RECT(pb).right,BIGDOC_IN_RECT(pb).bottom,

                                BIGDOC_FILTER_RECT(pb).left,BIGDOC_FILTER_RECT(pb).top,BIGDOC_FILTER_RECT(pb).right,BIGDOC_FILTER_RECT(pb).bottom);dbg(s);}

                */

        } else {

                // if any of the formulae involve random access to image pixels,

                // ask for the entire image

                if (needall) {

                        SETRECT(IN_RECT(pb), 0, 0, IMAGE_SIZE(pb).h, IMAGE_SIZE(pb).v);

                }

                else {

                        // TODO: This does not work with GIMP. So, if we are using GIMP, we should

                        //       somehow always use "needall=true", and/or find out why this doesn't work

                        //       with GIMP.

                        // otherwise, process the filtered area, by chunksize parts

                        IN_RECT(pb).left = FILTER_RECT(pb).left;

                        IN_RECT(pb).right = FILTER_RECT(pb).right;

                        IN_RECT(pb).top = (int16)toprow;

                        IN_RECT(pb).bottom = (int16)MIN(toprow + chunksize, FILTER_RECT(pb).bottom);

                        if (cnvused) {

                                // cnv() needs one extra pixel in each direction

                                if (IN_RECT(pb).left > 0)

                                        --IN_RECT(pb).left;

                                if (IN_RECT(pb).right < IMAGE_SIZE(pb).h)

                                        ++IN_RECT(pb).right;

                                if (IN_RECT(pb).top > 0)

                                        --IN_RECT(pb).top;

                                if (IN_RECT(pb).bottom < IMAGE_SIZE(pb).v)

                                        ++IN_RECT(pb).bottom;

                        }

                }

                OUT_RECT(pb) = FILTER_RECT(pb);

                /*

                {char s[0x100];sprintf(s,"RequestNext needall=%d inRect=(%d,%d,%d,%d) filterRect=(%d,%d,%d,%d)",

                                needall,

                                IN_RECT(pb).left,IN_RECT(pb).top,IN_RECT(pb).right,IN_RECT(pb).bottom,

                                FILTER_RECT(pb).left,FILTER_RECT(pb).top,FILTER_RECT(pb).right,FILTER_RECT(pb).bottom);dbg(s);}

                */

        }

}

void DoStart(FilterRecordPtr pb){

        /* Global variable "needall": if src() or rad() functions are used, random access to the image data is required,

           so we must request the entire image in a single chunk, otherwise we will use chunksize "CHUNK_ROWS". */

        if (HAS_BIG_DOC(pb)) {

                chunksize = needall ? (BIGDOC_FILTER_RECT(pb).bottom - BIGDOC_FILTER_RECT(pb).top) : CHUNK_ROWS;

                toprow = BIGDOC_FILTER_RECT(pb).top;

        } else {

                chunksize = needall ? (FILTER_RECT(pb).bottom - FILTER_RECT(pb).top) : CHUNK_ROWS;

                toprow = FILTER_RECT(pb).top;

        }

        RequestNext(pb, toprow);

}

OSErr DoContinue(FilterRecordPtr pb){

        OSErr e = noErr;

        long outoffset;

        if (HAS_BIG_DOC(pb)) {

                VRect fr;

                if (needall) {

                        fr = BIGDOC_FILTER_RECT(pb);  // filter whole selection at once

                } else if (cnvused) {

                        // we've requested one pixel extra all around

                        // (see RequestNext()), just for access purposes. But filter

                        // original selection only.

                        fr.left = BIGDOC_FILTER_RECT(pb).left;

                        fr.right = BIGDOC_FILTER_RECT(pb).right;

                        fr.top = toprow;

                        fr.bottom = MIN(toprow + chunksize, BIGDOC_FILTER_RECT(pb).bottom);

                } else {  // filter whatever portion we've been given

                        fr = BIGDOC_IN_RECT(pb);

                }

                outoffset = (long)pb->outRowBytes * (fr.top - BIGDOC_OUT_RECT(pb).top)

                        + (long)nplanes * (fr.left - BIGDOC_OUT_RECT(pb).left);

                if (!(e = process_scaled_bigdoc(pb, true, fr, fr,

                        (Ptr)pb->outData + outoffset, pb->outRowBytes, 1.)))

                {

                        toprow += chunksize;

                        if (toprow < BIGDOC_FILTER_RECT(pb).bottom)

                                RequestNext(pb, toprow);

                        else {

                                SETRECT(BIGDOC_IN_RECT(pb), 0, 0, 0, 0);

                                BIGDOC_OUT_RECT(pb) = BIGDOC_MASK_RECT(pb) = BIGDOC_IN_RECT(pb);

                        }

                }

        } else {

                Rect fr;

                if (needall) {

                        fr = FILTER_RECT(pb);  // filter whole selection at once

                } else if (cnvused) {

                        // we've requested one pixel extra all around

                        // (see RequestNext()), just for access purposes. But filter

                        // original selection only.

                        fr.left = FILTER_RECT(pb).left;

                        fr.right = FILTER_RECT(pb).right;

                        fr.top = toprow;

                        fr.bottom = MIN(toprow + chunksize, FILTER_RECT(pb).bottom);

                } else {  // filter whatever portion we've been given

                        fr = IN_RECT(pb);

                }

                outoffset = (long)pb->outRowBytes*(fr.top - OUT_RECT(pb).top)

                        + (long)nplanes*(fr.left - OUT_RECT(pb).left);

                if(!(e = process_scaled_olddoc(pb, true, fr, fr,

                        (Ptr)pb->outData+outoffset, pb->outRowBytes, 1.)))

                {

                        toprow += chunksize;

                        if(toprow < FILTER_RECT(pb).bottom)

                                RequestNext(pb,toprow);

                        else{

                                SETRECT(IN_RECT(pb),0,0,0,0);

                                OUT_RECT(pb) = MASK_RECT(pb) = IN_RECT(pb);

                        }

                }

        }

        return e;

}

void DoFinish(FilterRecordPtr pb){

        int i;

        WriteScriptParamsOnRead();

        for(i = 4; i--;){

                freetree(tree[i]);

                if(expr[i]) free(expr[i]);

        }

}