+++ /dev/null
-/*M///////////////////////////////////////////////////////////////////////////////////////
-//
-// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
-//
-// By downloading, copying, installing or using the software you agree to this license.
-// If you do not agree to this license, do not download, install,
-// copy or use the software.
-//
-//
-// Intel License Agreement
-// For Open Source Computer Vision Library
-//
-// Copyright (C) 2000, Intel Corporation, all rights reserved.
-// Third party copyrights are property of their respective owners.
-//
-// Redistribution and use in source and binary forms, with or without modification,
-// are permitted provided that the following conditions are met:
-//
-// * Redistribution's of source code must retain the above copyright notice,
-// this list of conditions and the following disclaimer.
-//
-// * Redistribution's in binary form must reproduce the above copyright notice,
-// this list of conditions and the following disclaimer in the documentation
-// and/or other materials provided with the distribution.
-//
-// * The name of Intel Corporation may not be used to endorse or promote products
-// derived from this software without specific prior written permission.
-//
-// This software is provided by the copyright holders and contributors "as is" and
-// any express or implied warranties, including, but not limited to, the implied
-// warranties of merchantability and fitness for a particular purpose are disclaimed.
-// In no event shall the Intel Corporation or contributors be liable for any direct,
-// indirect, incidental, special, exemplary, or consequential damages
-// (including, but not limited to, procurement of substitute goods or services;
-// loss of use, data, or profits; or business interruption) however caused
-// and on any theory of liability, whether in contract, strict liability,
-// or tort (including negligence or otherwise) arising in any way out of
-// the use of this software, even if advised of the possibility of such damage.
-//
-//M*/
-
-#include "grfmt_pxm.h"
-#include <assert.h>
-#include <string.h>
-#include <ctype.h>
-#include <limits.h>
-
-/************************ P*M reader *****************************/
-
-static int ReadNumber( RLByteStream& strm, int maxdigits )
-{
- int code;
- int val = 0;
- int digits = 0;
-
- code = strm.GetByte();
-
- if( !isdigit(code))
- {
- do
- {
- while( isspace(code))
- code = strm.GetByte();
-
- if( code == '#' )
- {
- do
- {
- code = strm.GetByte();
- }
- while( code != '\n' && code != '\r' );
- }
-
- code = strm.GetByte();
- }
- while( !isdigit( code ));
- }
-
- do
- {
- val = val*10 + code - '0';
- if( ++digits >= maxdigits ) break;
- code = strm.GetByte();
- }
- while( isdigit(code));
-
- return val;
-}
-
-
-GrFmtPXMReader::GrFmtPXMReader()
-{
- m_sign_len = 3;
- m_signature ="";
- m_description = "Portable image format (*.pbm;*.pgm;*.ppm)";
- m_offset = -1;
-}
-
-
-bool GrFmtPXMReader::CheckFormat( const char* signature )
-{
- return strlen(signature) >= 3 && signature[0] == 'P' &&
- '1' <= signature[1] && signature[1] <= '6' &&
- isspace(signature[2]);
-}
-
-
-int GrFmtPXMReader::GetColor()
-{
- return m_bpp > 8 ? 1 : 0;
-}
-
-
-void GrFmtPXMReader::Close()
-{
- m_strm.Close();
-}
-
-
-bool GrFmtPXMReader::ReadHeader()
-{
- bool result = false;
-
- assert( strlen(m_filename) != 0 );
- if( !m_strm.Open( m_filename )) return false;
-
- try
- {
- int code = m_strm.GetByte();
- if( code != 'P' )
- BAD_HEADER_ERR();
-
- code = m_strm.GetByte();
- switch( code )
- {
- case '1': case '4': m_bpp = 1; break;
- case '2': case '5': m_bpp = 8; break;
- case '3': case '6': m_bpp = 24; break;
- default: BAD_HEADER_ERR();
- }
-
- m_binary = code >= '4';
-
- m_width = ReadNumber( m_strm, INT_MAX );
- m_height = ReadNumber( m_strm, INT_MAX );
-
- m_maxval = m_bpp == 1 ? 1 : ReadNumber( m_strm, INT_MAX );
-
- if( m_maxval > 255 ) m_binary = false;
-
- if( m_width > 0 && m_height > 0 && m_maxval > 0 && m_maxval < (1 << 16))
- {
- m_offset = m_strm.GetPos();
- result = true;
- }
- }
- catch( int )
- {
- }
-
- if( !result )
- {
- m_offset = -1;
- m_width = m_height = -1;
- m_strm.Close();
- }
- return result;
-}
-
-
-bool GrFmtPXMReader::ReadData( uchar* data, int step, int color )
-{
- const int buffer_size = 1 << 12;
- uchar buffer[buffer_size];
- uchar pal_buffer[buffer_size];
- uchar bgr_buffer[buffer_size];
- PaletteEntry palette[256];
- bool result = false;
- uchar* src = buffer;
- uchar* gray_palette = pal_buffer;
- uchar* bgr = bgr_buffer;
- int src_pitch = (m_width*m_bpp + 7)/8;
- int nch = color ? 3 : 1;
- int width3 = m_width*nch;
- int i, x, y;
-
- if( m_offset < 0 || !m_strm.IsOpened())
- return false;
-
- if( src_pitch+32 > buffer_size )
- src = new uchar[width3 + 32];
-
- if( m_maxval + 1 > buffer_size )
- gray_palette = new uchar[m_maxval + 1];
-
- if( m_width*3 + 32 > buffer_size )
- bgr = new uchar[m_width*3 + 32];
-
- // create LUT for converting colors
- for( i = 0; i <= m_maxval; i++ )
- {
- gray_palette[i] = (uchar)(i*255/m_maxval);
- }
-
- FillGrayPalette( palette, 8 );
-
- try
- {
- m_strm.SetPos( m_offset );
-
- switch( m_bpp )
- {
- /************************* 1 BPP ************************/
- case 1:
- if( !m_binary )
- {
- for( y = 0; y < m_height; y++, data += step )
- {
- for( x = 0; x < m_width; x++ )
- {
- src[x] = gray_palette[ReadNumber( m_strm, 1 ) != 0];
- }
-
- if( color )
- FillColorRow8( data, src, m_width, palette );
- else
- memcpy( data, src, m_width );
- }
- }
- else
- {
- for( y = 0; y < m_height; y++, data += step )
- {
- m_strm.GetBytes( src, src_pitch );
-
- if( color )
- FillColorRow1( data, src, m_width, palette );
- else
- FillGrayRow1( data, src, m_width, gray_palette );
- }
- }
- result = true;
- break;
-
- /************************* 8 BPP ************************/
- case 8:
- case 24:
- for( y = 0; y < m_height; y++, data += step )
- {
- if( !m_binary )
- {
- for( x = 0; x < width3; x++ )
- {
- int code = ReadNumber( m_strm, INT_MAX );
- if( (unsigned)code > (unsigned)m_maxval ) code = m_maxval;
- src[x] = gray_palette[code];
- }
- }
- else
- {
- m_strm.GetBytes( src, width3 );
- }
-
- if( m_bpp == 8 )
- {
- if( color )
- FillColorRow8( src, data, m_width, palette );
- else
- memcpy( data, src, m_width );
- }
- else
- {
- if( color )
- CvtRGBToGray( src, data, m_width );
- else
- CvtRGBToBGR( src, data, m_width );
- }
- }
- result = true;
- break;
- default:
- assert(0);
- }
- }
- catch( int )
- {
- }
-
- if( src != buffer )
- delete src;
-
- if( bgr != bgr_buffer )
- delete bgr;
-
- if( gray_palette != pal_buffer )
- delete gray_palette;
-
- return true;
-}
-
projects / opencv / blobdiff