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#include "BMPLoader.h"
#include "itextstream.h"
#include "ifilesystem.h"
typedef unsigned char byte;
#include "RGBAImage.h"
#include "stream/ScopedArchiveBuffer.h"
#include "stream/PointerInputStream.h"
#include "stream/utils.h"
namespace image
{
typedef unsigned char PaletteEntry[4];
typedef struct
{
char id[2];
unsigned long fileSize;
unsigned long reserved0;
unsigned long bitmapDataOffset;
unsigned long bitmapHeaderSize;
unsigned long width;
unsigned long height;
unsigned short planes;
unsigned short bitsPerPixel;
unsigned long compression;
unsigned long bitmapDataSize;
unsigned long hRes;
unsigned long vRes;
unsigned long colors;
unsigned long importantColors;
PaletteEntry palette[256];
} BMPHeader_t;
class ReadPixel8
{
PaletteEntry* m_palette;
public:
ReadPixel8(PaletteEntry* palette) : m_palette(palette)
{
}
void operator()(stream::PointerInputStream& inputStream, byte*& pixbuf) const
{
byte palIndex;
inputStream.read(&palIndex, 1);
*pixbuf++ = m_palette[palIndex][2];
*pixbuf++ = m_palette[palIndex][1];
*pixbuf++ = m_palette[palIndex][0];
*pixbuf++ = 0xff;
}
};
class ReadPixel16
{
public:
void operator()(stream::PointerInputStream& inputStream, byte*& pixbuf) const
{
unsigned short shortPixel;
inputStream.read(reinterpret_cast<byte*>(&shortPixel), sizeof(unsigned short)); //!\todo Is this endian safe?
*pixbuf++ = static_cast<byte>(shortPixel & (31 << 10)) >> 7;
*pixbuf++ = static_cast<byte>(shortPixel & (31 << 5)) >> 2;
*pixbuf++ = static_cast<byte>(shortPixel & (31)) << 3;
*pixbuf++ = 0xff;
}
};
class ReadPixel24
{
public:
void operator()(stream::PointerInputStream& inputStream, byte*& pixbuf) const
{
byte bgr[3];
inputStream.read(bgr, 3);
*pixbuf++ = bgr[2];
*pixbuf++ = bgr[1];
*pixbuf++ = bgr[0];
*pixbuf++ = 255;
}
};
class ReadPixel32
{
public:
void operator()(stream::PointerInputStream& inputStream, byte*& pixbuf) const
{
byte bgra[4];
inputStream.read(bgra, 4);
*pixbuf++ = bgra[2];
*pixbuf++ = bgra[1];
*pixbuf++ = bgra[0];
*pixbuf++ = bgra[3];
}
};
template<typename ReadPixel>
void ReadBMP(stream::PointerInputStream& inputStream, byte* bmpRGBA, int rows, int columns, ReadPixel readPixel)
{
for (int row = rows - 1; row >= 0; row--)
{
byte* pixbuf = bmpRGBA + row * columns * 4;
for (int column = 0; column < columns; column++)
{
readPixel(inputStream, pixbuf);
}
}
}
RGBAImagePtr LoadBMPBuff(stream::PointerInputStream& inputStream, std::size_t length)
{
BMPHeader_t bmpHeader;
inputStream.read(reinterpret_cast<byte*>(bmpHeader.id), 2);
bmpHeader.fileSize = stream::readLittleEndian<uint32_t>(inputStream);
bmpHeader.reserved0 = stream::readLittleEndian<uint32_t>(inputStream);
bmpHeader.bitmapDataOffset = stream::readLittleEndian<uint32_t>(inputStream);
bmpHeader.bitmapHeaderSize = stream::readLittleEndian<uint32_t>(inputStream);
bmpHeader.width = stream::readLittleEndian<uint32_t>(inputStream);
bmpHeader.height = stream::readLittleEndian<uint32_t>(inputStream);
bmpHeader.planes = stream::readLittleEndian<uint16_t>(inputStream);
bmpHeader.bitsPerPixel = stream::readLittleEndian<uint16_t>(inputStream);
bmpHeader.compression = stream::readLittleEndian<uint32_t>(inputStream);
bmpHeader.bitmapDataSize = stream::readLittleEndian<uint32_t>(inputStream);
bmpHeader.hRes = stream::readLittleEndian<uint32_t>(inputStream);
bmpHeader.vRes = stream::readLittleEndian<uint32_t>(inputStream);
bmpHeader.colors = stream::readLittleEndian<uint32_t>(inputStream);
bmpHeader.importantColors = stream::readLittleEndian<uint32_t>(inputStream);
if (bmpHeader.bitsPerPixel == 8)
{
int paletteSize = bmpHeader.colors * 4;
inputStream.read(reinterpret_cast<byte*>(bmpHeader.palette), paletteSize);
}
if (bmpHeader.id[0] != 'B' && bmpHeader.id[1] != 'M')
{
rError() << "LoadBMP: only Windows-style BMP files supported\n";
return RGBAImagePtr();
}
if (bmpHeader.fileSize != length)
{
rError() << "LoadBMP: header size does not match file size (" << bmpHeader.fileSize << " vs. " << length << ")\n";
return RGBAImagePtr();
}
if (bmpHeader.compression != 0)
{
rError() << "LoadBMP: only uncompressed BMP files supported\n";
return RGBAImagePtr();
}
if (bmpHeader.bitsPerPixel < 8)
{
rError() << "LoadBMP: monochrome and 4-bit BMP files not supported\n";
return RGBAImagePtr();
}
int columns = bmpHeader.width;
int rows = bmpHeader.height;
if (rows < 0)
rows = -rows;
RGBAImagePtr image(new RGBAImage(columns, rows));
switch (bmpHeader.bitsPerPixel)
{
case 8:
ReadBMP(inputStream, image->getPixels(), rows, columns, ReadPixel8(bmpHeader.palette));
break;
case 16:
ReadBMP(inputStream, image->getPixels(), rows, columns, ReadPixel16());
break;
case 24:
ReadBMP(inputStream, image->getPixels(), rows, columns, ReadPixel24());
break;
case 32:
ReadBMP(inputStream, image->getPixels(), rows, columns, ReadPixel32());
break;
default:
rError() << "LoadBMP: illegal pixel_size '" << bmpHeader.bitsPerPixel << "'\n";
return RGBAImagePtr();
}
return image;
}
ImagePtr BMPLoader::load(ArchiveFile& file) const
{
archive::ScopedArchiveBuffer buffer(file);
stream::PointerInputStream inputStream(buffer.buffer);
return LoadBMPBuff(inputStream, buffer.length);
}
ImageTypeLoader::Extensions BMPLoader::getExtensions() const
{
Extensions extensions;
extensions.push_back("bmp");
return extensions;
}
}
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