irrlicht/source/Irrlicht/CImageLoaderRGB.h

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// Copyright (C) 2009-2012 Gary Conway
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h
/*
Author: Gary Conway (Viper) - co-author of the ZIP file format, Feb 1989,
see the story at http://www.idcnet.us/ziphistory.html
Website: http://idcnet.us
Email: codeslinger@vipergc.com
Created: March 1, 2009
Version: 1.0
Updated:
*/
#ifndef IRR_C_IMAGE_LOADER_RGB_H_INCLUDED
#define IRR_C_IMAGE_LOADER_RGB_H_INCLUDED
// define _IRR_RGB_FILE_INVERTED_IMAGE_ to preserve the inverted format of the RGB file
// commenting this out will invert the inverted image,resulting in the image being upright
#define _IRR_RGB_FILE_INVERTED_IMAGE_
#include "IrrCompileConfig.h"
#ifdef _IRR_COMPILE_WITH_RGB_LOADER_
#include "IImageLoader.h"
namespace irr
{
namespace video
{
// byte-align structures
#include "irrpack.h"
// the RGB image file header structure
struct SRGBHeader
{
u16 Magic; // IRIS image file magic number
u8 Storage; // Storage format
u8 BPC; // Number of bytes per pixel channel
u16 Dimension; // Number of dimensions
u16 Xsize; // X size in pixels
u16 Ysize; // Y size in pixels
u16 Zsize; // Z size in pixels
u32 Pixmin; // Minimum pixel value
u32 Pixmax; // Maximum pixel value
u32 Dummy1; // ignored
char Imagename[80];// Image name
u32 Colormap; // Colormap ID
// char Dummy2[404];// Ignored
} PACK_STRUCT;
// Default alignment
#include "irrunpack.h"
// this structure holds context specific data about the file being loaded.
typedef struct _RGBdata
{
u8 *tmp;
u8 *tmpR;
u8 *tmpG;
u8 *tmpB;
u8 *tmpA;
u32 *StartTable; // compressed data table, holds file offsets
u32 *LengthTable; // length for the above data, hold lengths for above
u32 TableLen; // len of above tables
SRGBHeader Header; // define the .rgb file header
u32 ImageSize;
u8 *rgbData;
public:
_RGBdata() : tmp(0), tmpR(0), tmpG(0), tmpB(0), tmpA(0),
StartTable(0), LengthTable(0), TableLen(0), ImageSize(0), rgbData(0)
{
}
~_RGBdata()
{
delete [] tmp;
delete [] tmpR;
delete [] tmpG;
delete [] tmpB;
delete [] tmpA;
delete [] StartTable;
delete [] LengthTable;
delete [] rgbData;
}
bool allocateTemps()
{
tmp = tmpR = tmpG = tmpB = tmpA = 0;
tmp = new u8 [Header.Xsize * 256 * Header.BPC];
if (!tmp)
return false;
if (Header.Zsize >= 1)
{
tmpR = new u8[Header.Xsize * Header.BPC];
if (!tmpR)
return false;
}
if (Header.Zsize >= 2)
{
tmpG = new u8[Header.Xsize * Header.BPC];
if (!tmpG)
return false;
}
if (Header.Zsize >= 3)
{
tmpB = new u8[Header.Xsize * Header.BPC];
if (!tmpB)
return false;
}
if (Header.Zsize >= 4)
{
tmpA = new u8[Header.Xsize * Header.BPC];
if (!tmpA)
return false;
}
return true;
}
} rgbStruct;
//! Surface Loader for Silicon Graphics RGB files
class CImageLoaderRGB : public IImageLoader
{
public:
//! constructor
CImageLoaderRGB();
//! returns true if the file maybe is able to be loaded by this class
//! based on the file extension (e.g. ".tga")
virtual bool isALoadableFileExtension(const io::path& filename) const IRR_OVERRIDE;
//! returns true if the file maybe is able to be loaded by this class
virtual bool isALoadableFileFormat(io::IReadFile* file) const IRR_OVERRIDE;
//! creates a surface from the file
virtual IImage* loadImage(io::IReadFile* file) const IRR_OVERRIDE;
private:
bool readHeader(io::IReadFile* file, rgbStruct& rgb) const;
void readRGBrow(u8 *buf, int y, int z, io::IReadFile* file, rgbStruct& rgb) const;
void processFile(io::IReadFile *file, rgbStruct& rgb) const;
bool checkFormat(io::IReadFile *file, rgbStruct& rgb) const;
bool readOffsetTables(io::IReadFile* file, rgbStruct& rgb) const;
void converttoARGB(u32* in, const u32 size) const;
};
} // end namespace video
} // end namespace irr
#endif // _IRR_COMPILE_WITH_RGB_LOADER_
#endif // IRR_C_IMAGE_LOADER_RGB_H_INCLUDED