forked from Mirrorlandia_minetest/irrlicht
cfde879801
Thanks @sfan5 for the original patch (got modified a bit): dbd39120e7
Forum: https://irrlicht.sourceforge.io/forum/viewtopic.php?f=2&t=52819&p=306518
Those are the common formats, but rest of image loaders should also call this some day.
git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6387 dfc29bdd-3216-0410-991c-e03cc46cb475
378 lines
8.6 KiB
C++
378 lines
8.6 KiB
C++
// 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 "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;
|
|
|
|
if ( !IImage::checkDataSizeLimit( (size_t)header.Width*header.Height*header.BPP) )
|
|
{
|
|
os::Printer::log("Image dimensions too large for file", file->getFileName(), ELL_WARNING);
|
|
goto cleanup;
|
|
}
|
|
|
|
switch(header.BPP)
|
|
{
|
|
case 1:
|
|
image = new CImage(ECF_A1R5G5B5, dim);
|
|
if (image)
|
|
CColorConverter::convert1BitTo16Bit(bmpData, (s16*)image->getData(), header.Width, header.Height, pitch, true);
|
|
break;
|
|
case 4:
|
|
image = new CImage(ECF_A1R5G5B5, dim);
|
|
if (image)
|
|
CColorConverter::convert4BitTo16Bit(bmpData, (s16*)image->getData(), header.Width, header.Height, paletteData, pitch, true);
|
|
break;
|
|
case 8:
|
|
image = new CImage(ECF_A1R5G5B5, dim);
|
|
if (image)
|
|
CColorConverter::convert8BitTo16Bit(bmpData, (s16*)image->getData(), header.Width, header.Height, paletteData, pitch, true);
|
|
break;
|
|
case 16:
|
|
image = new CImage(ECF_A1R5G5B5, dim);
|
|
if (image)
|
|
CColorConverter::convert16BitTo16Bit((s16*)bmpData, (s16*)image->getData(), header.Width, header.Height, pitch, true);
|
|
break;
|
|
case 24:
|
|
image = new CImage(ECF_R8G8B8, dim);
|
|
if (image)
|
|
CColorConverter::convert24BitTo24Bit(bmpData, (u8*)image->getData(), 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->getData(), header.Width, header.Height, pitch, true);
|
|
break;
|
|
};
|
|
|
|
// clean up
|
|
cleanup:
|
|
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
|
|
|