core/DesktopEditor/cximage/libpsd/gradient_fill.c

/**
 * libpsd - Photoshop file formats (*.psd) decode library
 * Copyright (C) 2004-2007 Graphest Software.
 *
 * libpsd is the legal property of its developers, whose names are too numerous
 * to list here.  Please refer to the COPYRIGHT file distributed with this
 * source distribution.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Library 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 Library 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
 *
 * $Id: gradient_fill.c, created by Patrick in 2006.06.11, libpsd@graphest.com Exp $
 */

#include "libpsd.h"
#include "psd_system.h"
#include "psd_stream.h"
#include "psd_descriptor.h"


// Gradient fill setting (Photoshop 6.0)
psd_status psd_get_layer_gradient_fill(psd_context * context, psd_layer_record * layer)
{
	psd_layer_gradient_fill * data;
	psd_int length;
	psd_int number_items;
	psd_uint type, key, rootkey;
	psd_uchar keychar[256];
	
	layer->layer_info_type[layer->layer_info_count] = psd_layer_info_type_gradient_fill;
	layer->layer_type = psd_layer_type_gradient_fill;

	data = (psd_layer_gradient_fill *)psd_malloc(sizeof(psd_layer_gradient_fill));
	if(data == NULL)
		return psd_status_malloc_failed;
	memset(data, 0, sizeof(psd_layer_gradient_fill));
	layer->layer_info_data[layer->layer_info_count] = (psd_uint)data;
	layer->layer_info_count ++;

	// default value
	data->scale = 100;
	data->reverse = psd_false;
	data->dithered = psd_false;
	data->align_with_layer = psd_true;

	// Version ( = 16 for Photoshop 6.0)
	if(psd_stream_get_int(context) != 16)
		return psd_status_gradient_fill_unsupport_version;

	// Unicode string: name from classID
	length = psd_stream_get_int(context) * 2;
	psd_stream_get_null(context, length);

	// classID: 4 bytes (length), followed either by string or (if length is zero) 4-
	// byte classID
	length = psd_stream_get_int(context);
	if(length == 0)
		data->id = psd_stream_get_int(context);
	else
		psd_stream_get_null(context, length);

	// Number of items in descriptor
	number_items = psd_stream_get_int(context);

	/***************************************************************************/
	while(number_items--)
	{
		length = psd_stream_get_int(context);
		psd_assert(length == 0);
		if(length == 0)
			rootkey = psd_stream_get_int(context);
		else
		{
			rootkey = 0;
			psd_stream_get(context, keychar, length);
			keychar[length] = 0;
		}
		// Type: OSType key
		type = psd_stream_get_int(context);

		switch(rootkey)
		{
			case 'Dthr':	// dithered
				// boolean
				psd_assert(type == 'bool');
				data->dithered = psd_stream_get_bool(context);
				break;

			case 'Rvrs':	// reverse
				// boolean
				psd_assert(type == 'bool');
				data->reverse = psd_stream_get_bool(context);
				break;

			case 'Algn':	// align with layer
				// boolean
				psd_assert(type == 'bool');
				data->align_with_layer = psd_stream_get_bool(context);
				break;
				
			case 'Angl':	// angle
				// Unit psd_float
				psd_assert(type == 'UntF');
				
				// '#Ang' = angle: base degrees
				key = psd_stream_get_int(context);
				psd_assert(key == '#Ang');

				// Actual value (double)
				data->angle = psd_stream_get_double(context);
				break;

			case 'Scl ':	// scale
				// Unit psd_float
				psd_assert(type == 'UntF');

				// '#Prc' = percent:
				key = psd_stream_get_int(context);
				psd_assert(key == '#Prc');
								
				// Actual value (double)
				data->scale = (psd_int)psd_stream_get_double(context);
				break;

			case 'Type':	// gradient style
				// Enumerated
				psd_assert(type == 'enum');

				// TypeID: 4 bytes (length), followed either by string or (if length is zero) 4-
				// byte typeID
				length = psd_stream_get_int(context);
				psd_assert(length == 0);
				key = psd_stream_get_int(context);
				// Gradient Type
				psd_assert(key == 'GrdT');
				data->style = psd_stream_get_object_gradient_style(context);
				break;

			case 'Grad':	// grid minor
				// Descriptor
				psd_assert(type == 'Objc');
				psd_stream_get_object_gradient_color(&data->gradient_color, context);
				break;

			default:
				psd_assert(0);
				psd_stream_get_object_null(type, context);
				break;
		}
	}

	return psd_status_done;
}