Retour
Version Originale

./aip/1.8aipmod/source/Irrlicht/CImageLoaderBMP.cpp :


// Copyright (C) 2002-2011 Nikolaus Gebhardt

// This file is part of the "Irrlicht Engine".

// For conditions of distribution and use, see copyright notice in irrlicht.h


#include "CImageLoaderBMP.h"

#ifdef _IRR_COMPILE_WITH_BMP_LOADER_

#include "IReadFile.h"
#include "SColor.h"
#include "CColorConverter.h"
#include "CImage.h"
#include "os.h"
#include "irrString.h"

namespace irr
{
namespace video
{


//! constructor

CImageLoaderBMP::CImageLoaderBMP()
{
	#ifdef _DEBUG
	setDebugName("CImageLoaderBMP");
	#endif
}


//! returns true if the file maybe is able to be loaded by this class

//! based on the file extension (e.g. ".tga")

bool CImageLoaderBMP::isALoadableFileExtension(const io::path& filename) const
{
	return core::hasFileExtension ( filename, "bmp" );
}


//! returns true if the file maybe is able to be loaded by this class

bool CImageLoaderBMP::isALoadableFileFormat(io::IReadFile* file) const
{
	u16 headerID;
	file->read(&headerID, sizeof(u16));
#ifdef __BIG_ENDIAN__
	headerID = os::Byteswap::byteswap(headerID);
#endif
	return headerID == 0x4d42;
}


void CImageLoaderBMP::decompress8BitRLE(u8*& bmpData, s32 size, s32 width, s32 height, s32 pitch) const
{
	u8* p = bmpData;
	u8* newBmp = new u8[(width+pitch)*height];
	u8* d = newBmp;
	u8* destEnd = newBmp + (width+pitch)*height;
	s32 line = 0;

	while (bmpData - p < size && d < destEnd)
	{
		if (*p == 0)
		{
			++p;

			switch(*p)
			{
			case 0: // end of line

				++p;
				++line;
				d = newBmp + (line*(width+pitch));
				break;
			case 1: // end of bmp

				delete [] bmpData;
				bmpData = newBmp;
				return;
			case 2:
				++p; d +=(u8)*p;  // delta

				++p; d += ((u8)*p)*(width+pitch);
				++p;
				break;
			default:
				{
					// absolute mode

					s32 count = (u8)*p; ++p;
					s32 readAdditional = ((2-(count%2))%2);
					s32 i;

					for (i=0; i<count; ++i)
					{
						*d = *p;
						++p;
						++d;
					}

					for (i=0; i<readAdditional; ++i)
						++p;
				}
			}
		}
		else
		{
			s32 count = (u8)*p; ++p;
			u8 color = *p; ++p;
			for (s32 i=0; i<count; ++i)
			{
				*d = color;
				++d;
			}
		}
	}

	delete [] bmpData;
	bmpData = newBmp;
}


void CImageLoaderBMP::decompress4BitRLE(u8*& bmpData, s32 size, s32 width, s32 height, s32 pitch) const
{
	s32 lineWidth = (width+1)/2+pitch;
	u8* p = bmpData;
	u8* newBmp = new u8[lineWidth*height];
	u8* d = newBmp;
	u8* destEnd = newBmp + lineWidth*height;
	s32 line = 0;
	s32 shift = 4;

	while (bmpData - p < size && d < destEnd)
	{
		if (*p == 0)
		{
			++p;

			switch(*p)
			{
			case 0: // end of line

				++p;
				++line;
				d = newBmp + (line*lineWidth);
				shift = 4;
				break;
			case 1: // end of bmp

				delete [] bmpData;
				bmpData = newBmp;
				return;
			case 2:
				{
					++p;
					s32 x = (u8)*p; ++p;
					s32 y = (u8)*p; ++p;
					d += x/2 + y*lineWidth;
					shift = x%2==0 ? 4 : 0;
				}
				break;
			default:
				{
					// absolute mode

					s32 count = (u8)*p; ++p;
					s32 readAdditional = ((2-((count)%2))%2);
					s32 readShift = 4;
					s32 i;

					for (i=0; i<count; ++i)
					{
						s32 color = (((u8)*p) >> readShift) & 0x0f;
						readShift -= 4;
						if (readShift < 0)
						{
							++*p;
							readShift = 4;
						}

						u8 mask = 0x0f << shift;
						*d = (*d & (~mask)) | ((color << shift) & mask);

						shift -= 4;
						if (shift < 0)
						{
							shift = 4;
							++d;
						}

					}

					for (i=0; i<readAdditional; ++i)
						++p;
				}
			}
		}
		else
		{
			s32 count = (u8)*p; ++p;
			s32 color1 = (u8)*p; color1 = color1 & 0x0f;
			s32 color2 = (u8)*p; color2 = (color2 >> 4) & 0x0f;
			++p;

			for (s32 i=0; i<count; ++i)
			{
				u8 mask = 0x0f << shift;
				u8 toSet = (shift==0 ? color1 : color2) << shift;
				*d = (*d & (~mask)) | (toSet & mask);

				shift -= 4;
				if (shift < 0)
				{
					shift = 4;
					++d;
				}
			}
		}
	}

	delete [] bmpData;
	bmpData = newBmp;
}



//! creates a surface from the file

IImage* CImageLoaderBMP::loadImage(io::IReadFile* file) const
{
	SBMPHeader header;

	file->read(&header, sizeof(header));

#ifdef __BIG_ENDIAN__
	header.Id = os::Byteswap::byteswap(header.Id);
	header.FileSize = os::Byteswap::byteswap(header.FileSize);
	header.BitmapDataOffset = os::Byteswap::byteswap(header.BitmapDataOffset);
	header.BitmapHeaderSize = os::Byteswap::byteswap(header.BitmapHeaderSize);
	header.Width = os::Byteswap::byteswap(header.Width);
	header.Height = os::Byteswap::byteswap(header.Height);
	header.Planes = os::Byteswap::byteswap(header.Planes);
	header.BPP = os::Byteswap::byteswap(header.BPP);
	header.Compression = os::Byteswap::byteswap(header.Compression);
	header.BitmapDataSize = os::Byteswap::byteswap(header.BitmapDataSize);
	header.PixelPerMeterX = os::Byteswap::byteswap(header.PixelPerMeterX);
	header.PixelPerMeterY = os::Byteswap::byteswap(header.PixelPerMeterY);
	header.Colors = os::Byteswap::byteswap(header.Colors);
	header.ImportantColors = os::Byteswap::byteswap(header.ImportantColors);
#endif

	s32 pitch = 0;

	//! return if the header is false


	if (header.Id != 0x4d42)
		return 0;

	if (header.Compression > 2) // we'll only handle RLE-Compression

	{
		os::Printer::log("Compression mode not supported.", ELL_ERROR);
		return 0;
	}

	// adjust bitmap data size to dword boundary

	header.BitmapDataSize += (4-(header.BitmapDataSize%4))%4;

	// read palette


	long pos = file->getPos();
	s32 paletteSize = (header.BitmapDataOffset - pos) / 4;

	s32* paletteData = 0;
	if (paletteSize)
	{
		paletteData = new s32[paletteSize];
		file->read(paletteData, paletteSize * sizeof(s32));
#ifdef __BIG_ENDIAN__
		for (s32 i=0; i<paletteSize; ++i)
			paletteData[i] = os::Byteswap::byteswap(paletteData[i]);
#endif
	}

	// read image data


	if (!header.BitmapDataSize)
	{
		// okay, lets guess the size

		// some tools simply don't set it

		header.BitmapDataSize = static_cast<u32>(file->getSize()) - header.BitmapDataOffset;
	}

	file->seek(header.BitmapDataOffset);

	f32 t = (header.Width) * (header.BPP / 8.0f);
	s32 widthInBytes = (s32)t;
	t -= widthInBytes;
	if (t!=0.0f)
		++widthInBytes;

	s32 lineData = widthInBytes + ((4-(widthInBytes%4)))%4;
	pitch = lineData - widthInBytes;

	u8* bmpData = new u8[header.BitmapDataSize];
	file->read(bmpData, header.BitmapDataSize);

	// decompress data if needed

	switch(header.Compression)
	{
	case 1: // 8 bit rle

		decompress8BitRLE(bmpData, header.BitmapDataSize, header.Width, header.Height, pitch);
		break;
	case 2: // 4 bit rle

		decompress4BitRLE(bmpData, header.BitmapDataSize, header.Width, header.Height, pitch);
		break;
	}

	// create surface


	// no default constructor from packed area! ARM problem!

	core::dimension2d<u32> dim;
	dim.Width = header.Width;
	dim.Height = header.Height;

	IImage* image = 0;
	switch(header.BPP)
	{
	case 1:
		image = new CImage(ECF_A1R5G5B5, dim);
		if (image)
			CColorConverter::convert1BitTo16Bit(bmpData, (s16*)image->lock(), header.Width, header.Height, pitch, true);
		break;
	case 4:
		image = new CImage(ECF_A1R5G5B5, dim);
		if (image)
			CColorConverter::convert4BitTo16Bit(bmpData, (s16*)image->lock(), header.Width, header.Height, paletteData, pitch, true);
		break;
	case 8:
		image = new CImage(ECF_A1R5G5B5, dim);
		if (image)
			CColorConverter::convert8BitTo16Bit(bmpData, (s16*)image->lock(), header.Width, header.Height, paletteData, pitch, true);
		break;
	case 16:
		image = new CImage(ECF_A1R5G5B5, dim);
		if (image)
			CColorConverter::convert16BitTo16Bit((s16*)bmpData, (s16*)image->lock(), header.Width, header.Height, pitch, true);
		break;
	case 24:
		image = new CImage(ECF_R8G8B8, dim);
		if (image)
			CColorConverter::convert24BitTo24Bit(bmpData, (u8*)image->lock(), header.Width, header.Height, pitch, true, true);
		break;
	case 32: // thx to Reinhard Ostermeier

		image = new CImage(ECF_A8R8G8B8, dim);
		if (image)
			CColorConverter::convert32BitTo32Bit((s32*)bmpData, (s32*)image->lock(), header.Width, header.Height, pitch, true);
		break;
	};
	if (image)
		image->unlock();

	// clean up


	delete [] paletteData;
	delete [] bmpData;

	return image;
}


//! creates a loader which is able to load windows bitmaps

IImageLoader* createImageLoaderBMP()
{
	return new CImageLoaderBMP;
}


} // end namespace video

} // end namespace irr


#endif

Options Liens officiels Caractéristiques Statistiques Communauté
Corrections
irrlicht
irrklang
irredit
irrxml
xhtml 1.0
css 2.1
Propulsé par FluxBB
Traduit par FluxBB.fr
882 membres
1429 sujets
11119 messages
Dernier membre inscrit: LiseBuisson96
74 invités en ligne
Aucun membre connecté
RSS Feed