92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/**
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* libpsd - Photoshop file formats (*.psd) decode library
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* Copyright (C) 2004-2007 Graphest Software.
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*
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* libpsd is the legal property of its developers, whose names are too numerous
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* to list here. Please refer to the COPYRIGHT file distributed with this
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* source distribution.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* $Id: threshold.c, created by Patrick in 2006.05.22, libpsd@graphest.com Exp $
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*/
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#include "libpsd.h"
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#include "psd_system.h"
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#include "psd_stream.h"
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#include "psd_color.h"
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#include "psd_rect.h"
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extern void psd_adjustment_blend_gray(psd_context * context, psd_layer_record * layer, psd_rect * dst_rect,
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psd_uchar * lookup_table);
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psd_status psd_get_layer_threshold(psd_context * context, psd_layer_record * layer)
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{
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psd_layer_threshold * data;
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layer->layer_info_type[layer->layer_info_count] = psd_layer_info_type_threshold;
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layer->layer_type = psd_layer_type_threshold;
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data = (psd_layer_threshold *)psd_malloc(sizeof(psd_layer_threshold));
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if(data == NULL)
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return psd_status_malloc_failed;
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memset(data, 0, sizeof(psd_layer_threshold));
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layer->layer_info_data[layer->layer_info_count] = (psd_uint)data;
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layer->layer_info_count ++;
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// (1...255)
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data->level = psd_stream_get_short(context);
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psd_assert(data->level >= 1 && data->level <= 255);
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// for padding ?
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psd_stream_get_short(context);
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layer->adjustment_valid = psd_true;
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return psd_status_done;
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}
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psd_bool psd_layer_blend_threshold(psd_context * context, psd_layer_record * layer, psd_rect * dst_rect)
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{
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psd_uint layer_info_data;
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psd_layer_threshold * data = NULL;
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psd_int i;
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psd_uchar lookup_table[256];
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for(i = 0; i < layer->layer_info_count; i ++)
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{
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if(layer->layer_info_type[i] == psd_layer_info_type_threshold)
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{
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layer_info_data = layer->layer_info_data[i];
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data = (psd_layer_threshold *)layer_info_data;
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break;
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}
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}
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if(data == NULL)
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return psd_false;
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memset(lookup_table, 0, data->level);
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memset(lookup_table + data->level, 255, 256 - data->level);
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psd_adjustment_blend_gray(context, layer, dst_rect, lookup_table);
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layer->adjustment_valid = psd_false;
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return psd_true;
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}
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