minetest/irr/src/CImageLoaderBMP.h

// 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

#pragma once

#include "IImageLoader.h"

namespace irr
{
namespace video
{

// byte-align structures
#include "irrpack.h"

struct SBMPHeader
{
	u16 Id; //	BM - Windows 3.1x, 95, NT, 98, 2000, ME, XP
			//	BA - OS/2 Bitmap Array
			//	CI - OS/2 Color Icon
			//	CP - OS/2 Color Pointer
			//	IC - OS/2 Icon
			//	PT - OS/2 Pointer
	u32 FileSize;
	u32 Reserved;
	u32 BitmapDataOffset;
	u32 BitmapHeaderSize; // should be 28h for windows bitmaps or
						  // 0Ch for OS/2 1.x or F0h for OS/2 2.x
	u32 Width;
	u32 Height;
	u16 Planes;
	u16 BPP; // 1: Monochrome bitmap
			 // 4: 16 color bitmap
			 // 8: 256 color bitmap
			 // 16: 16bit (high color) bitmap
			 // 24: 24bit (true color) bitmap
			 // 32: 32bit (true color) bitmap

	u32 Compression; // 0: none (Also identified by BI_RGB)
					 // 1: RLE 8-bit / pixel (Also identified by BI_RLE4)
					 // 2: RLE 4-bit / pixel (Also identified by BI_RLE8)
					 // 3: Bitfields  (Also identified by BI_BITFIELDS)

	u32 BitmapDataSize; // Size of the bitmap data in bytes. This number must be rounded to the next 4 byte boundary.
	u32 PixelPerMeterX;
	u32 PixelPerMeterY;
	u32 Colors;
	u32 ImportantColors;
} PACK_STRUCT;

// Default alignment
#include "irrunpack.h"

/*!
	Surface Loader for Windows bitmaps
*/
class CImageLoaderBMP : public IImageLoader
{
public:
	//! constructor
	CImageLoaderBMP();

	//! returns true if the file maybe is able to be loaded by this class
	//! based on the file extension (e.g. ".tga")
	bool isALoadableFileExtension(const io::path &filename) const override;

	//! returns true if the file maybe is able to be loaded by this class
	bool isALoadableFileFormat(io::IReadFile *file) const override;

	//! creates a surface from the file
	IImage *loadImage(io::IReadFile *file) const override;

private:
	void decompress8BitRLE(u8 *&BmpData, s32 size, s32 width, s32 height, s32 pitch) const;

	void decompress4BitRLE(u8 *&BmpData, s32 size, s32 width, s32 height, s32 pitch) const;
};

} // end namespace video
} // end namespace irr