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git-svn-id: svn://fileserver/activex/AVS/Sources/TeamlabOffice/trunk/ServerComponents@61945 954022d7-b5bf-4e40-9824-e11837661b57
121 lines
3.8 KiB
C
121 lines
3.8 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: brightness_contrast.c, created by Patrick in 2006.05.22, libpsd@graphest.com Exp $
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*/
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#include <math.h>
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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_rect.h"
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#include "psd_math.h"
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extern void psd_adjustment_blend_image(psd_context * context, psd_layer_record * layer, psd_rect * dst_rect,
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psd_uchar * lookup_table);
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// Brightness and Contrast
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psd_status psd_get_layer_brightness_contrast(psd_context * context, psd_layer_record * layer)
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{
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psd_layer_brightness_contrast * data;
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layer->layer_info_type[layer->layer_info_count] = psd_layer_info_type_brightness_contrast;
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layer->layer_type = psd_layer_type_brightness_contrast;
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data = (psd_layer_brightness_contrast *)psd_malloc(sizeof(psd_layer_brightness_contrast));
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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_brightness_contrast));
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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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// Brightness
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data->brightness = psd_stream_get_short(context);
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// Contrast
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data->contrast = psd_stream_get_short(context);
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// Mean value for brightness and contrast
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data->mean_value = psd_stream_get_short(context);
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// Lab color only
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data->Lab_color = psd_stream_get_char(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_brightness_contrast(psd_context * context, psd_layer_record * layer, psd_rect * dst_rect)
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{
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psd_layer_brightness_contrast * data = NULL;
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psd_int i;
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psd_float brightness, contrast, slant, value;
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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_brightness_contrast)
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{
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data = (psd_layer_brightness_contrast *)layer->layer_info_data[i];
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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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if(layer->adjustment_valid == psd_true)
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{
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if(data->brightness != 0 && data->contrast != 0)
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{
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brightness = (psd_float)data->brightness / data->mean_value;
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contrast = (psd_float)data->contrast / data->mean_value;
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slant = (psd_float)tan((contrast + 1) * PSD_PI_4);
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for(i = 0; i < 256; i ++)
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{
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value = i / 255.0f;
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if(brightness < 0.0)
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value = value * (1.0f + brightness);
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else if(brightness > 0.0)
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value = value + ((1.0f - value) * brightness);
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if(contrast != 0.0)
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value = (value - 0.5f) * slant + 0.5f;
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value = 255 * value + 0.5f;
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value = PSD_CONSTRAIN(value, 0, 255);
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data->lookup_table[i] = (psd_int)value;
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}
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}
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else
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{
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for(i = 0; i < 256; i ++)
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data->lookup_table[i] = i;
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}
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}
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psd_adjustment_blend_image(context, layer, dst_rect, data->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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