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/********************************************************************************
* *
* W e b - P I m a g e I n p u t / O u t p u t *
* *
*********************************************************************************
* Copyright (C) 2011,2022 by S. Jansen & J. 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"
#ifdef HAVE_WEBP_H
#include "webp/types.h"
#include "webp/encode.h"
#include "webp/decode.h"
#endif
/*
Notes:
- Support for Google WEBP image file compression.
- Reference:
http://code.google.com/speed/webp/
- Header layout:
Offset Description
0 "RIFF" 4-byte tag
4 Size of image data (including metadata) starting at offset 8
8 "WEBP" the form-type signature
12 "VP8 " 4-bytes tags, describing the raw video format used
16 Size of the raw VP8 image data, starting at offset 20; should be even
20 The VP8 bytes...
*/
using namespace FX;
/*******************************************************************************/
namespace FX {
#ifndef FXLOADWEBP
extern FXAPI FXbool fxcheckWEBP(FXStream& store);
extern FXAPI FXbool fxloadWEBP(FXStream& store,FXColor*& data,FXint& width,FXint& height);
extern FXAPI FXbool fxsaveWEBP(FXStream& store,const FXColor* data,FXint width,FXint height,FXfloat quality);
#endif
/*******************************************************************************/
#ifdef HAVE_WEBP_H
// Check if stream contains a WebP
FXbool fxcheckWEBP(FXStream& store){
FXuchar signature[16];
store.load(signature,16);
store.position(-16,FXFromCurrent);
return (signature[ 0]=='R' && signature[ 1]=='I' && signature[ 2]=='F' && signature[ 3]=='F' &&
signature[ 8]=='W' && signature[ 9]=='E' && signature[10]=='B' && signature[11]=='P' &&
signature[12]=='V' && signature[13]=='P' && signature[14]=='8' && signature[15]==' ');
}
/*******************************************************************************/
// Load a WebP image
FXbool fxloadWEBP(FXStream& store,FXColor*& data,FXint& width,FXint& height){
FXuchar *buffer=nullptr;
FXlong start;
FXuint size;
FXbool swap;
// Everyone remember where we parked.
start=store.position();
// Go directly to size chunk
store.position(4,FXFromCurrent);
// Read size in little endian
swap=store.swapBytes();
store.setBigEndian(false);
store >> size;
size+=8; // add riff and size fields
store.setBigEndian(swap);
// Start over
store.position(start);
// Allocate Buffer
if(allocElms(buffer,size)){
// Read the complete data
store.load(buffer,size);
// Get Info
if(WebPGetInfo(buffer,size,&width,&height) && width>0 && height>0){
// Allocate Output Buffer
if(allocElms(data,width*height)){
// Try Decoding
if(WebPDecodeBGRAInto(buffer,size,(FXuchar*)data,width*height*4,width*4)){
freeElms(buffer);
return true;
}
freeElms(data);
}
}
freeElms(buffer);
}
data=nullptr;
height=0;
width=0;
return false;
}
/*******************************************************************************/
// Save a WebP image
FXbool fxsaveWEBP(FXStream& store,const FXColor* colors,FXint width,FXint height,FXfloat quality){
FXuchar *data=nullptr;
FXuint size=WebPEncodeBGRA((const FXuchar*)colors,width,height,width*4,quality,&data);
if(size){
store.save(data,size);
free(data);
return true;
}
return false;
}
/*******************************************************************************/
#else
// Check if stream contains a PNG
FXbool fxcheckWEBP(FXStream&){
return false;
}
// Stub routine
FXbool fxloadWEBP(FXStream&,FXColor*& data,FXint& width,FXint& height){
static const FXColor color[2]={FXRGB(0,0,0),FXRGB(255,255,255)};
static const FXuchar webp_bits[] = {
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0xc6,0x00,0x06,0x00,0x82,0x00,0x04,0x00,0x82,
0x00,0x04,0x00,0x82,0x00,0x04,0x00,0x92,0x38,0x3c,0x3e,0x92,0x44,0x44,0x44,
0x92,0x82,0x84,0x84,0xaa,0xfe,0x84,0x84,0xaa,0x02,0x84,0x84,0xaa,0x02,0x84,
0x84,0x44,0x82,0x84,0x44,0x44,0x84,0x44,0x3c,0x44,0x78,0x3c,0x04,0x00,0x00,
0x00,0x04,0x00,0x00,0x00,0x1e,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
allocElms(data,32*32);
for(FXint p=0; p<32*32; p++){
data[p]=color[(webp_bits[p>>3]>>(p&7))&1];
}
width=32;
height=32;
return true;
}
// Stub routine
FXbool fxsaveWEBP(FXStream&,const FXColor*,FXint,FXint,FXfloat){
return false;
}
#endif
}
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