380 lines
8.6 KiB
C++
380 lines
8.6 KiB
C++
// Copyright (C) 2002-2007 Nikolaus Gebhardt
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// This file is part of the "Irrlicht Engine".
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// For conditions of distribution and use, see copyright notice in irrlicht.h
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#include "CImageLoaderBMP.h"
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#include "IReadFile.h"
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#include "SColor.h"
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#include "CColorConverter.h"
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#include "CImage.h"
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#include "os.h"
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#include "irrString.h"
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namespace irr
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{
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namespace video
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{
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//! constructor
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CImageLoaderBMP::CImageLoaderBMP()
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: BmpData(0), PaletteData(0)
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{
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#ifdef _DEBUG
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setDebugName("CImageLoaderBMP");
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#endif
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}
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//! destructor
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CImageLoaderBMP::~CImageLoaderBMP()
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{
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if (PaletteData)
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delete [] PaletteData;
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if (BmpData)
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delete [] BmpData;
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}
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//! returns true if the file maybe is able to be loaded by this class
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//! based on the file extension (e.g. ".tga")
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bool CImageLoaderBMP::isALoadableFileExtension(const c8* fileName)
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{
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return strstr(fileName, ".bmp") != 0;
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}
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//! returns true if the file maybe is able to be loaded by this class
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bool CImageLoaderBMP::isALoadableFileFormat(irr::io::IReadFile* file)
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{
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u16 headerID;
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file->read(&headerID, sizeof(u16));
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#ifdef __BIG_ENDIAN__
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headerID = os::Byteswap::byteswap(headerID);
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#endif
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return headerID == 0x4d42;
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}
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void CImageLoaderBMP::decompress8BitRLE(u8*& BmpData, s32 size, s32 width, s32 height, s32 pitch)
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{
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u8* p = BmpData;
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u8* newBmp = new u8[(width+pitch)*height];
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u8* d = newBmp;
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u8* destEnd = newBmp + (width+pitch)*height;
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s32 line = 0;
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while (BmpData - p < size && d < destEnd)
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{
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if (*p == 0)
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{
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++p;
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switch(*p)
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{
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case 0: // end of line
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++p;
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++line;
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d = newBmp + (line*(width+pitch));
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break;
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case 1: // end of bmp
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delete [] BmpData;
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BmpData = newBmp;
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return;
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case 2:
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++p; d +=(u8)*p; // delta
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++p; d += ((u8)*p)*(width+pitch);
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++p;
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break;
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default:
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{
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// absolute mode
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s32 count = (u8)*p; ++p;
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s32 readAdditional = ((2-(count%2))%2);
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s32 i;
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for (i=0; i<count; ++i)
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{
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*d = *p;
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++p;
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++d;
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}
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for (i=0; i<readAdditional; ++i)
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++p;
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}
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}
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}
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else
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{
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s32 count = (u8)*p; ++p;
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s32 color = (u8)*p; ++p;
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for (s32 i=0; i<count; ++i)
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{
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*d = color;
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++d;
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}
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}
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}
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delete [] BmpData;
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BmpData = newBmp;
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}
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void CImageLoaderBMP::decompress4BitRLE(u8*& BmpData, s32 size, s32 width, s32 height, s32 pitch)
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{
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s32 lineWidth = (width+1)/2+pitch;
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u8* p = BmpData;
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u8* newBmp = new u8[lineWidth*height];
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u8* d = newBmp;
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u8* destEnd = newBmp + lineWidth*height;
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s32 line = 0;
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s32 shift = 4;
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while (BmpData - p < size && d < destEnd)
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{
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if (*p == 0)
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{
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++p;
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switch(*p)
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{
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case 0: // end of line
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++p;
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++line;
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d = newBmp + (line*lineWidth);
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shift = 4;
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break;
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case 1: // end of bmp
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delete [] BmpData;
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BmpData = newBmp;
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return;
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case 2:
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{
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++p;
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s32 x = (u8)*p; ++p;
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s32 y = (u8)*p; ++p;
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d += x/2 + y*lineWidth;
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shift = x%2==0 ? 4 : 0;
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}
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break;
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default:
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{
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// absolute mode
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s32 count = (u8)*p; ++p;
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s32 readAdditional = ((2-((count)%2))%2);
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s32 readShift = 4;
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s32 i;
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for (i=0; i<count; ++i)
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{
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s32 color = (((u8)*p) >> readShift) & 0x0f;
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readShift -= 4;
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if (readShift < 0)
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{
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++*p;
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readShift = 4;
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}
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u8 mask = 0x0f << shift;
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*d = (*d & (~mask)) | ((color << shift) & mask);
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shift -= 4;
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if (shift < 0)
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{
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shift = 4;
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++d;
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}
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}
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for (i=0; i<readAdditional; ++i)
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++p;
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}
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}
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}
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else
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{
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s32 count = (u8)*p; ++p;
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s32 color1 = (u8)*p; color1 = color1 & 0x0f;
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s32 color2 = (u8)*p; color2 = (color2 >> 4) & 0x0f;
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++p;
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for (s32 i=0; i<count; ++i)
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{
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u8 mask = 0x0f << shift;
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u8 toSet = (shift==0 ? color1 : color2) << shift;
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*d = (*d & (~mask)) | (toSet & mask);
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shift -= 4;
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if (shift < 0)
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{
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shift = 4;
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++d;
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}
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}
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}
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}
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delete [] BmpData;
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BmpData = newBmp;
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}
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//! creates a surface from the file
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IImage* CImageLoaderBMP::loadImage(irr::io::IReadFile* file)
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{
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SBMPHeader header;
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file->read(&header, sizeof(header));
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#ifdef __BIG_ENDIAN__
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header.Id = os::Byteswap::byteswap(header.Id);
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header.FileSize = os::Byteswap::byteswap(header.FileSize);
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header.BitmapDataOffset = os::Byteswap::byteswap(header.BitmapDataOffset);
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header.BitmapHeaderSize = os::Byteswap::byteswap(header.BitmapHeaderSize);
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header.Width = os::Byteswap::byteswap(header.Width);
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header.Height = os::Byteswap::byteswap(header.Height);
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header.Planes = os::Byteswap::byteswap(header.Planes);
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header.BPP = os::Byteswap::byteswap(header.BPP);
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header.Compression = os::Byteswap::byteswap(header.Compression);
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header.BitmapDataSize = os::Byteswap::byteswap(header.BitmapDataSize);
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header.PixelPerMeterX = os::Byteswap::byteswap(header.PixelPerMeterX);
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header.PixelPerMeterY = os::Byteswap::byteswap(header.PixelPerMeterY);
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header.Colors = os::Byteswap::byteswap(header.Colors);
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header.ImportantColors = os::Byteswap::byteswap(header.ImportantColors);
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#endif
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s32 pitch = 0;
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//! return if the header is false
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if (header.Id != 0x4d42)
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return 0;
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if (header.Compression > 2) // we'll only handle RLE-Compression
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{
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os::Printer::log("Compression mode not supported.", ELL_ERROR);
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return 0;
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}
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// adjust bitmap data size to dword boundary
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header.BitmapDataSize += (4-(header.BitmapDataSize%4))%4;
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// read palette
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s32 pos = file->getPos();
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s32 paletteSize = (header.BitmapDataOffset - pos) / 4;
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if (paletteSize)
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{
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PaletteData = new s32[paletteSize];
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file->read(PaletteData, paletteSize * sizeof(s32));
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#ifdef __BIG_ENDIAN__
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for (int i=0; i<paletteSize; ++i)
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PaletteData[i] = os::Byteswap::byteswap(PaletteData[i]);
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#endif
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}
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// read image data
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if (!header.BitmapDataSize)
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{
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// okay, lets guess the size
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// some tools simply don't set it
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header.BitmapDataSize = file->getSize() - header.BitmapDataOffset;
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}
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file->seek(header.BitmapDataOffset);
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f32 t = (header.Width) * (header.BPP / 8.0f);
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s32 widthInBytes = (s32)t;
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t -= widthInBytes;
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if (t!=0.0f)
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++widthInBytes;
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s32 lineData = widthInBytes + ((4-(widthInBytes%4)))%4;
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pitch = lineData - widthInBytes;
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BmpData = new u8[header.BitmapDataSize];
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file->read(BmpData, header.BitmapDataSize);
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// decompress data if needed
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switch(header.Compression)
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{
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case 1: // 8 bit rle
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decompress8BitRLE(BmpData, header.BitmapDataSize, header.Width, header.Height, pitch);
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break;
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case 2: // 4 bit rle
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decompress4BitRLE(BmpData, header.BitmapDataSize, header.Width, header.Height, pitch);
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break;
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}
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// create surface
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IImage* image = 0;
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switch(header.BPP)
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{
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case 1:
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image = new CImage(ECF_A1R5G5B5, core::dimension2d<s32>(header.Width, header.Height));
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if (image)
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CColorConverter::convert1BitTo16Bit(BmpData, (s16*)image->lock(), header.Width, header.Height, pitch, true);
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break;
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case 4:
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image = new CImage(ECF_A1R5G5B5, core::dimension2d<s32>(header.Width, header.Height));
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if (image)
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CColorConverter::convert4BitTo16Bit(BmpData, (s16*)image->lock(), header.Width, header.Height, PaletteData, pitch, true);
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break;
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case 8:
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image = new CImage(ECF_A1R5G5B5, core::dimension2d<s32>(header.Width, header.Height));
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if (image)
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CColorConverter::convert8BitTo16Bit(BmpData, (s16*)image->lock(), header.Width, header.Height, PaletteData, pitch, true);
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break;
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case 16:
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image = new CImage(ECF_A1R5G5B5, core::dimension2d<s32>(header.Width, header.Height));
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if (image)
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CColorConverter::convert16BitTo16Bit((s16*)BmpData, (s16*)image->lock(), header.Width, header.Height, pitch, true);
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break;
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case 24:
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image = new CImage(ECF_R8G8B8, core::dimension2d<s32>(header.Width, header.Height));
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if (image)
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CColorConverter::convert24BitTo24Bit(BmpData, (u8*)image->lock(), header.Width, header.Height, pitch, true, true);
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break;
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case 32: // thx to Reinhard Ostermeier
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image = new CImage(ECF_A8R8G8B8, core::dimension2d<s32>(header.Width, header.Height));
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if (image)
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CColorConverter::convert32BitTo32Bit((s32*)BmpData, (s32*)image->lock(), header.Width, header.Height, pitch, true);
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break;
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};
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if (image)
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image->unlock();
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// clean up
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delete [] PaletteData;
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PaletteData = 0;
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delete [] BmpData;
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BmpData = 0;
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return image;
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}
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//! creates a loader which is able to load windows bitmaps
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IImageLoader* createImageLoaderBMP()
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{
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return new CImageLoaderBMP;
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}
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} // end namespace video
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} // end namespace irr
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