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/********************************************************************************
* *
* P P M I n p u t / O u t p u t *
* *
*********************************************************************************
* Copyright (C) 2003,2022 by Jeroen van der Zijp. All Rights Reserved. *
*********************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This library 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 Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/> *
********************************************************************************/
#include "xincs.h"
#include "fxver.h"
#include "fxdefs.h"
#include "fxmath.h"
#include "FXArray.h"
#include "FXHash.h"
#include "FXElement.h"
#include "FXStream.h"
/*
Notes:
- Definitely a 'no-frills' format.
- Certainly not optimized for speed; but it works.
- No support for values greater than 255.
*/
using namespace FX;
/*******************************************************************************/
namespace FX {
#ifndef FXLOADPPM
extern FXAPI FXbool fxcheckPPM(FXStream& store);
extern FXAPI FXbool fxloadPPM(FXStream& store,FXColor*& data,FXint& width,FXint& height);
extern FXAPI FXbool fxsavePPM(FXStream& store,const FXColor *data,FXint width,FXint height);
#endif
// Furnish our own version
extern FXAPI FXint __snprintf(FXchar* string,FXint length,const FXchar* format,...);
// Read one integer
static FXint getint(FXStream& store){
FXint num=0;
FXuchar c;
while(!store.eof()){
store >> c;
if('0'<=c && c<='9') break;
if(c=='#'){
while(!store.eof()){
store >> c;
if(c=='\n') break;
}
}
}
while(!store.eof()){
num=num*10+c-'0';
store >> c;
if(c<'0' || c>'9') break;
}
return num;
}
// Check if stream contains a PPM
FXbool fxcheckPPM(FXStream& store){
FXuchar signature[2];
store.load(signature,2);
store.position(-2,FXFromCurrent);
return signature[0]=='P' && '1'<=signature[1] && signature[1]<='6';
}
// Load image from stream
FXbool fxloadPPM(FXStream& store,FXColor*& data,FXint& width,FXint& height){
FXint npixels,i,j,maxvalue=1;
FXuchar *pp;
FXuchar magic,format,byte;
// Null out
data=nullptr;
width=0;
height=0;
// Check magic byte
store >> magic;
if(magic=='P'){
// Check format
// "P1" = Ascii bitmap,
// "P2" = Ascii greymap,
// "P3" = Ascii pixmap,
// "P4" = Raw bitmap,
// "P5" = Raw greymap,
// "P6" = Raw pixmap
store >> format;
if('1'<=format && format<='6'){
// Get size
width=getint(store);
height=getint(store);
// Sanity check
if(0<width && 0<height){
npixels=width*height;
// Get maximum value
if(format!='1' && format!='4'){
maxvalue=getint(store);
if(maxvalue<=0 || maxvalue>=256) return false;
}
FXTRACE((100,"fxloadPPM: width=%d height=%d type=%c \n",width,height,format));
// Allocate buffer
if(callocElms(data,npixels)){
// Read it
pp=(FXuchar*)data;
switch(format){
case '1': // Ascii bitmap
for(i=0; i<height; i++){
for(j=0; j<width; j++,pp+=4){
byte=getint(store);
pp[2] = byte?255:0;
pp[1] = pp[2];
pp[0] = pp[2];
pp[3] = 255;
}
}
break;
case '2': // Ascii greymap
for(i=0; i<height; i++){
for(j=0; j<width; j++,pp+=4){
pp[2] = getint(store);
pp[1] = pp[2];
pp[0] = pp[2];
pp[3] = 255;
}
}
break;
case '3': // Ascii pixmap
for(i=0; i<height; i++){
for(j=0; j<width; j++,pp+=4){
pp[2] = getint(store);
pp[1] = getint(store);
pp[0] = getint(store);
pp[3] = 255;
}
}
break;
case '4': // Binary bitmap
for(i=0; i<height; i++){
for(j=0; j<width; j++,byte<<=1,pp+=4){
if((j&7)==0){ store >> byte; }
pp[2] = (byte&0x80)?255:0;
pp[1] = pp[2];
pp[0] = pp[2];
pp[3] = 255;
}
}
break;
case '5': // Binary greymap
for(i=0; i<height; i++){
for(j=0; j<width; j++,pp+=4){
store >> pp[2];
pp[1] = pp[2];
pp[0] = pp[2];
pp[3] = 255;
}
}
break;
case '6': // Binary pixmap
for(i=0; i<height; i++){
for(j=0; j<width; j++,pp+=4){
store >> pp[2];
store >> pp[1];
store >> pp[0];
pp[3] = 255;
}
}
break;
}
return true;
}
}
}
}
return false;
}
/*******************************************************************************/
// Save a bmp file to a stream
FXbool fxsavePPM(FXStream& store,const FXColor *data,FXint width,FXint height){
if(data && 0<width && 0<height){
const FXuchar *pp=(const FXuchar*)data;
FXint i,j,nsize;
FXchar size[32];
// Save header
nsize=__snprintf(size,sizeof(size),"P6\n%d %d\n255\n",width,height);
store.save(size,nsize);
// 24-bit/pixel
for(i=0; i<height; i++){
for(j=0; j<width; j++,pp+=4){
store << pp[2];
store << pp[1];
store << pp[0];
}
}
return true;
}
return false;
}
}
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