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// Copyright (C) 2002-2012 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h
#include "CImageLoaderPCX.h"
#ifdef _IRR_COMPILE_WITH_PCX_LOADER_
#include "IReadFile.h"
#include "SColor.h"
#include "CColorConverter.h"
#include "CImage.h"
#include "os.h"
#include "irrString.h"
namespace irr
{
namespace video
{
//! constructor
CImageLoaderPCX::CImageLoaderPCX()
{
#ifdef _DEBUG
setDebugName("CImageLoaderPCX");
#endif
}
//! returns true if the file maybe is able to be loaded by this class
//! based on the file extension (e.g. ".tga")
bool CImageLoaderPCX::isALoadableFileExtension(const io::path& filename) const
{
return core::hasFileExtension ( filename, "pcx" );
}
//! returns true if the file maybe is able to be loaded by this class
bool CImageLoaderPCX::isALoadableFileFormat(io::IReadFile* file) const
{
u8 headerID;
file->read(&headerID, sizeof(headerID));
return headerID == 0x0a;
}
//! creates a image from the file
IImage* CImageLoaderPCX::loadImage(io::IReadFile* file) const
{
SPCXHeader header;
s32* paletteData = 0;
file->read(&header, sizeof(header));
#ifdef __BIG_ENDIAN__
header.XMin = os::Byteswap::byteswap(header.XMin);
header.YMin = os::Byteswap::byteswap(header.YMin);
header.XMax = os::Byteswap::byteswap(header.XMax);
header.YMax = os::Byteswap::byteswap(header.YMax);
header.HorizDPI = os::Byteswap::byteswap(header.HorizDPI);
header.VertDPI = os::Byteswap::byteswap(header.VertDPI);
header.BytesPerLine = os::Byteswap::byteswap(header.BytesPerLine);
header.PaletteType = os::Byteswap::byteswap(header.PaletteType);
header.HScrSize = os::Byteswap::byteswap(header.HScrSize);
header.VScrSize = os::Byteswap::byteswap(header.VScrSize);
#endif
//! return if the header is wrong
if (header.Manufacturer != 0x0a && header.Encoding != 0x01)
return 0;
// return if this isn't a supported type
if ((header.BitsPerPixel != 8) && (header.BitsPerPixel != 4) && (header.BitsPerPixel != 1))
{
os::Printer::log("Unsupported bits per pixel in PCX file.",
file->getFileName(), irr::ELL_WARNING);
return 0;
}
// read palette
if( (header.BitsPerPixel == 8) && (header.Planes == 1) )
{
// the palette indicator (usually a 0x0c is found infront of the actual palette data)
// is ignored because some exporters seem to forget to write it. This would result in
// no image loaded before, now only wrong colors will be set.
const long pos = file->getPos();
file->seek( file->getSize()-256*3, false );
u8 *tempPalette = new u8[768];
paletteData = new s32[256];
file->read( tempPalette, 768 );
for( s32 i=0; i<256; i++ )
{
paletteData[i] = (0xff000000 |
(tempPalette[i*3+0] << 16) |
(tempPalette[i*3+1] << 8) |
(tempPalette[i*3+2]));
}
delete [] tempPalette;
file->seek(pos);
}
else if( header.BitsPerPixel == 4 )
{
paletteData = new s32[16];
for( s32 i=0; i<16; i++ )
{
paletteData[i] = (0xff000000 |
(header.Palette[i*3+0] << 16) |
(header.Palette[i*3+1] << 8) |
(header.Palette[i*3+2]));
}
}
// read image data
const s32 width = header.XMax - header.XMin + 1;
const s32 height = header.YMax - header.YMin + 1;
const s32 imagebytes = header.BytesPerLine * header.Planes * header.BitsPerPixel * height / 8;
u8* PCXData = new u8[imagebytes];
u8 cnt, value;
s32 lineoffset=0, linestart=0, nextmode=1;
for(s32 offset = 0; offset < imagebytes; offset += cnt)
{
file->read(&cnt, 1);
if( !((cnt & 0xc0) == 0xc0) )
{
value = cnt;
cnt = 1;
}
else
{
cnt &= 0x3f;
file->read(&value, 1);
}
if (header.Planes==1)
memset(PCXData+offset, value, cnt);
else
{
for (u8 i=0; i<cnt; ++i)
{
PCXData[linestart+lineoffset]=value;
lineoffset += 3;
if (lineoffset>=3*header.BytesPerLine)
{
lineoffset=nextmode;
if (++nextmode==3)
nextmode=0;
if (lineoffset==0)
linestart += 3*header.BytesPerLine;
}
}
}
}
// create image
video::IImage* image = 0;
s32 pad = (header.BytesPerLine - width * header.BitsPerPixel / 8) * header.Planes;
if (pad < 0)
pad = -pad;
if (header.BitsPerPixel==8)
{
switch(header.Planes) // TODO: Other formats
{
case 1:
image = new CImage(ECF_A1R5G5B5, core::dimension2d<u32>(width, height));
if (image)
CColorConverter::convert8BitTo16Bit(PCXData, (s16*)image->lock(), width, height, paletteData, pad);
break;
case 3:
image = new CImage(ECF_R8G8B8, core::dimension2d<u32>(width, height));
if (image)
CColorConverter::convert24BitTo24Bit(PCXData, (u8*)image->lock(), width, height, pad);
break;
}
}
else if (header.BitsPerPixel==4)
{
if (header.Planes==1)
{
image = new CImage(ECF_A1R5G5B5, core::dimension2d<u32>(width, height));
if (image)
CColorConverter::convert4BitTo16Bit(PCXData, (s16*)image->lock(), width, height, paletteData, pad);
}
}
else if (header.BitsPerPixel==1)
{
if (header.Planes==4)
{
image = new CImage(ECF_A1R5G5B5, core::dimension2d<u32>(width, height));
if (image)
CColorConverter::convert4BitTo16Bit(PCXData, (s16*)image->lock(), width, height, paletteData, pad);
}
else if (header.Planes==1)
{
image = new CImage(ECF_A1R5G5B5, core::dimension2d<u32>(width, height));
if (image)
CColorConverter::convert1BitTo16Bit(PCXData, (s16*)image->lock(), width, height, pad);
}
}
if (image)
image->unlock();
// clean up
delete [] paletteData;
delete [] PCXData;
return image;
}
//! creates a loader which is able to load pcx images
IImageLoader* createImageLoaderPCX()
{
return new CImageLoaderPCX();
}
} // end namespace video
} // end namespace irr
#endif
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