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image.h
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/*
OGN - Open Glider Network - http://glidernet.org/
Copyright (c) 2015 The OGN Project
A detailed list of copyright holders can be found in the file "AUTHORS".
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 3 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 software. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __IMAGE_H__
#define __IMAGE_H__
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <math.h>
// #include <png.h>
#include <jpeglib.h>
#include <setjmp.h>
// =============================================================================
template <class Type=float>
class MonoImage
{ public:
Type *Data; // pointer to image storage
int Size; // actuall (needed) storage size
int Allocated; // allocated storage (when 0 => storage is empty or outside of this object)
int Width; // number of columns
int Height; // number of rows
MonoImage()
{ Data=0; Width=0; Height=0; Size=0; Allocated=0; }
MonoImage(int NewWidth, int NewHeight) { New(NewWidth, NewHeight); }
~MonoImage()
{ if(Allocated) free(Data); }
void Free(void)
{ if(Allocated) free(Data);
Data=0; Size=0; Allocated=0; }
int Reallocate(int NewSize)
{ // printf("PixelImage::Reallocate(%d) ...\n", NewSize);
if(Allocated&&(NewSize==Size)) return Size;
Data=(Type *)realloc(Data, NewSize*sizeof(Type)); if(Data==0) { Allocated=0; Size=0; return 0; }
Allocated=NewSize; return NewSize; }
int New(int NewWidth, int NewHeight)
{ // printf("MonoImage::New(%dx%d) ...\n", NewWidth, NewHeight);
int NewSize=NewWidth*NewHeight;
if(Allocated<NewSize) Reallocate(NewSize);
if(Allocated<NewSize) { Width=0; Height=0; Size=0; return 0; }
Width=NewWidth; Height=NewHeight; Size=NewSize;
// printf(" Size=%d, Allocated=%d\n", Size, Allocated);
return Size; }
template <class NewType>
int New(MonoImage<NewType> &Ref)
{ return New(Ref.Width, Ref.Height); }
int NewBlank(int NewWidth, int NewHeight)
{ if(New(NewWidth, NewHeight)<=0) return 0;
Blank(0); return Size; }
int setExternal(Type *ExtImage, int ExtWidth, int ExtHeight)
{ if(Allocated) { free(Data); Allocated=0; }
Data=ExtImage; Width=ExtWidth; Height=ExtHeight;
return Size=Width*Height; }
// -----------------------------------------------------------------------------
bool isPixel(int X, int Y) const { return (X>=0) && (X<Width) && (Y>=0) && (Y<=Height); }
void setPixel(int X, int Y, Type Value) { Data[Y*Width+X]=Value; }
Type getPixel(int X, int Y) const { return Data[Y*Width+X]; }
Type incPixel(int X, int Y, Type Value=1) { return Data[Y*Width+X]+=Value; }
// -----------------------------------------------------------------------------
template <class ExtType>
int Copy(ExtType *ExtData, int ExtWidth, int ExtHeight, ExtType Scale=1)
{ if(New(ExtWidth, ExtHeight)<=0) return 0;
Type *ImgData = Data;
for(int Row=0; Row<Height; Row++)
{ for(int Col=0; Col<Width; Col++)
{ (*ImgData++) = Scale*(*ExtData++); }
}
return Size; }
template <class ExtType>
int Copy(MonoImage<ExtType> &ExtImage, ExtType Scale=1)
{ return Copy(ExtImage.Data, ExtImage.Width, ExtImage.Height, Scale); }
template <class ExtType>
int Add(ExtType *ExtData, int ExtWidth, int ExtHeight, ExtType Weight=1)
{ if(Size==0) { if(NewBlank(ExtWidth, ExtHeight)<=0) return 0; }
if( (Width!=ExtWidth) || (Height!=ExtHeight) ) return 0;
Type *ImgData = Data;
for(int Row=0; Row<Height; Row++)
{ for(int Col=0; Col<Width; Col++)
{ (*ImgData++) += Weight*(*ExtData++); }
}
return Size; }
template <class ExtType>
int Add(MonoImage<ExtType> &ExtImage, ExtType Weight=1)
{ return Add(ExtImage.Data, ExtImage.Width, ExtImage.Height, Weight); }
template <class ExtType>
int CopyBox(ExtType *ExtData, int ExtWidth, int ExtHeight, int FirstCol, int FirstRow, int Cols, int Rows, ExtType Scale=1)
{ if(New(Cols, Rows)<=0) return 0;
Type *ImgData = Data;
for(int Row=0; Row<Height; Row++)
{ int ExtRow = FirstRow+Row;
if( (ExtRow<0) || (ExtRow>=ExtHeight) )
{ for(int Col=0; Col<Width; Col++) (*ImgData++)=0; continue; }
ExtType *ExtRowData = ExtData + (ExtRow*ExtWidth);
int ExtCol = FirstCol;
for( int Col=0; Col<Width; Col++, ExtCol++)
{ ExtType Data=0;
if((ExtCol>=0) && (ExtCol<ExtWidth))
Data=ExtRowData[ExtCol];
(*ImgData++)=Scale*Data; }
}
return Size; }
template <class ExtType>
int CopyBox(MonoImage<ExtType> &ExtImage, int FirstCol, int FirstRow, int Cols, int Rows, ExtType Scale=1)
{ return CopyBox(ExtImage.Data, ExtImage.Width, ExtImage.Height, FirstCol, FirstRow, Cols, Rows, Scale); }
void Blank(Type Level=0)
{ if(Data==0) return;
Type *Image=Data; int Count=Size; for( ; Count; Count--) (*Image++)=Level; }
// -----------------------------------------------------------------------------
int WritePGM_8bpp(const char *FileName, Type LogRef=0, Type Scale=1, Type Bias=0) const
{ FILE *File=fopen(FileName,"wb"); if(File==0) return -1;
fprintf(File,"P5\n%d %d 255\n", Width, Height);
uint8_t Line[Width];
Type *Img = Data;
for(int Row=0; Row<Height; Row++)
{ for(int Col=0; Col<Width; Col++)
{ Type Pixel=(*Img++);
if(LogRef)
{ if(Pixel) { Pixel=logf((float)Pixel/LogRef); Pixel = Pixel*Scale + Bias; }
else Pixel=0; }
else
{ Pixel = Pixel*Scale + Bias; }
if(Pixel<0x00) Pixel=0x00;
else if(Pixel>0xFF) Pixel=0xFF;
Line[Col]=(uint8_t)Pixel; }
if(fwrite(Line, Width, 1, File)!=1) { fclose(File); return -1; }
}
fclose(File);
return Width*Height; }
/*
int WritePNG_8bpp(const char *FileName, Type LogRef=0, Type Scale=1, Type Bias=0) const
{ FILE *File=fopen(FileName, "wb"); if(File==0) return -1;
png_structp Struct;
png_infop Info;
Struct = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
if(Struct==0) { fclose(File); return -1; }
Info = png_create_info_struct(Struct);
if(Info==0) { png_destroy_write_struct(&Struct, (png_infopp)0); fclose(File); return -1; }
if(setjmp(png_jmpbuf(Struct))) { png_destroy_write_struct(&Struct, (png_infopp)0); fclose(File); return -1; }
png_set_IHDR(Struct, Info, Width, Height,
8, PNG_COLOR_TYPE_GRAY, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
png_init_io(Struct, File);
png_write_info(Struct, Info);
uint8_t Line[Width];
for(int Row=0; Row<Height; Row++)
{ Type *Img = Data+(Row*Width);
for(int Col=0; Col<Width; Col++)
{ Type Pixel=(*Img++);
if(LogRef)
{ if(Pixel) { Pixel=logf((float)Pixel/LogRef); Pixel = Pixel*Scale + Bias; }
else Pixel=0; }
else
{ Pixel = Pixel*Scale + Bias; }
if(Pixel<0x00) Pixel=0x00;
else if(Pixel>0xFF) Pixel=0xFF;
Line[Col]=(uint8_t)Pixel; }
png_write_row(Struct, Line);
}
png_write_end(Struct, Info);
png_destroy_write_struct(&Struct, (png_infopp)0);
fclose(File);
return Width*Height; }
*/
int WriteJPG_8bpp(int Fd, int Quality=80, Type LogRef=0, Type Scale=1, Type Bias=0) const
{ FILE *File=fdopen(Fd, "wb"); if(File==0) return -1;
int Size=WriteJPG_8bpp(File, Quality, LogRef, Scale, Bias);
fclose(File); return Size; }
int WriteJPG_8bpp(const char *FileName, int Quality=80, Type LogRef=0, Type Scale=1, Type Bias=0) const
{ FILE *File=fopen(FileName, "wb"); if(File==0) return -1;
int Size=WriteJPG_8bpp(File, Quality, LogRef, Scale, Bias);
fclose(File); return Size; }
int WriteJPG_8bpp(FILE *File, int Quality=80, Type LogRef=0, Type Scale=1, Type Bias=0) const
{
struct jpeg_compress_struct JpegCompress;
struct jpeg_error_mgr JpegErrorManager;
jmp_buf JpegErrorJmp;
JpegCompress.err = jpeg_std_error(&JpegErrorManager);
jpeg_create_compress(&JpegCompress);
JpegCompress.image_width = Width;
JpegCompress.image_height = Height;
JpegCompress.input_components = 1;
JpegCompress.in_color_space = JCS_GRAYSCALE;
jpeg_set_defaults(&JpegCompress);
jpeg_set_quality(&JpegCompress, Quality, TRUE);
jpeg_stdio_dest(&JpegCompress, File);
jpeg_start_compress(&JpegCompress, TRUE);
if(setjmp(JpegErrorJmp))
{ jpeg_abort_compress(&JpegCompress);
jpeg_destroy_compress(&JpegCompress);
return -1; }
uint8_t Line[Width];
for(int Row=0; Row<Height; Row++) // loop over image lines
{ Type *Img = Data+(Row*Width);
for(int Col=0; Col<Width; Col++) // loop over pixels in a line
{ Type Pixel=(*Img++);
if(LogRef) // logarythimc pixel rescale
{ if(Pixel) { Pixel=logf((float)Pixel/LogRef); Pixel = Pixel*Scale + Bias; }
else Pixel=0; } //
else // linear pixel rescale
{ Pixel = Pixel*Scale + Bias; }
if(Pixel<0x00) Pixel=0x00; // limit to 8 bits
else if(Pixel>0xFF) Pixel=0xFF;
Line[Col]=(uint8_t)Pixel; }
uint8_t *RowPtr=Line;
jpeg_write_scanlines(&JpegCompress, &RowPtr, 1);
}
jpeg_finish_compress(&JpegCompress);
jpeg_destroy_compress(&JpegCompress);
return Width*Height; }
} ;
// =============================================================================
#endif // of __IMAGE_H__