/*
    This file is part of icoformat, a Windows Icon (ICO) File Format
    plugin for Adobe Photoshop
    Copyright (C) 2002-2010 Toby Thain, toby@telegraphics.com.au

    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 "icoformat.h"

#include "PIAbout.h"

#include "entry.h" // must come after Photoshop includes

#include "ui.h"

enum{
	// estimate the largest total of memory allocations we might need
	MAX_MEM = 4*256 /* 4 x 256 = size of largest colour table */
			+ 4*256L*256L /* size of largest icon image */
			+ 32*256L /* largest transparency mask */
			+ (64L<<10) /* slop */
};

// MPW MrC requires a prototype
DLLEXPORT
MACPASCAL void PluginMain(short selector, FormatRecordPtr pb, intptr_t *data, short *result);

DLLEXPORT
MACPASCAL void PluginMain(short selector, FormatRecordPtr pb, intptr_t *data, short *result)
{
	OSErr e = noErr;
	BufferID tempId;

	// Need this global data to pass data between phases (Estimate/Write).
	// Was using malloc(), but that's rather dangerous, as it's supposed
	// to survive invocations of the plugin.

	if(selector != formatSelectorAbout && !*data){
		if( (*result = PS_BUFFER_ALLOC(sizeof(struct globals), &tempId)) )
			return;
		*data = (intptr_t)PS_BUFFER_LOCK(tempId, true);
	}

	EnterCodeResource();

	/* Perform the requested operation */

	switch (selector){
	case formatSelectorAbout: DoAbout((AboutRecordPtr)pb); break;

	case formatSelectorEstimatePrepare:
	case formatSelectorWritePrepare:
	case formatSelectorReadPrepare: /* estimate memory requirements */
		pb->maxData /= 2; // take half of available
		if(pb->maxData > MAX_MEM)
			pb->maxData = MAX_MEM;
		break;

	case formatSelectorReadStart:    e = read_start(pb); break;
	case formatSelectorReadContinue: e = read_continue(pb); break;
	case formatSelectorReadFinish:   e = read_finish(pb); break;

	case formatSelectorOptionsPrepare:
		pb->maxData = 0; // no buffers are allocated in Options
		break;
	case formatSelectorOptionsStart:
		// ask user whether to use standard ICO or Vista (PNG) format
		if(!formatdialog(pb))
			e = userCanceledErr;
		else
			G(usepng) = usepng; // pass this value to next phase
	case formatSelectorOptionsContinue:
		pb->data = NULL;
	case formatSelectorOptionsFinish:
		break;

	case formatSelectorEstimateStart:    e = estimate_start(pb, data); break;
	case formatSelectorEstimateContinue: e = estimate_continue(pb, data); break;
	case formatSelectorEstimateFinish:   e = estimate_finish(pb, data); break;

	case formatSelectorWriteStart:    e = write_start(pb, data); break;
	case formatSelectorWriteContinue: e = write_continue(pb, data); break;
	case formatSelectorWriteFinish:   e = write_finish(pb); break;

	case formatSelectorFilterFile: break;

	default: e = formatBadParameters;
	}

	*result = e;

	ExitCodeResource();
}