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Added check for byte swapping when writing RGB files so rgb files can be

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created on big endian machines
This commit is contained in:
Don BURNS
2003-08-16 18:52:37 +00:00
parent 3738c62cde
commit 52819c3f25
1 changed files with 122 additions and 88 deletions
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210
src/osgPlugins/rgb/ReaderWriterRGB.cpp
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@@ -18,19 +18,6 @@
using namespace osg;
typedef unsigned char * BytePtr;
template <class T>
inline void swapBytes( T &s )
{
if( sizeof( T ) == 1 ) return;
T d = s;
BytePtr sptr = (BytePtr)&s;
BytePtr dptr = &(((BytePtr)&d)[sizeof(T)-1]);
for( unsigned int i = 0; i < sizeof(T); i++ )
*(sptr++) = *(dptr--);
}
typedef struct _rawImageRec
{
@@ -47,6 +34,49 @@ typedef struct _rawImageRec
unsigned long rleEnd;
GLuint *rowStart;
GLint *rowSize;
typedef unsigned char * BytePtr;
bool needsBytesSwapped()
{
union {
int testWord;
char testByte[sizeof(int)];
}endianTest;
endianTest.testWord = 1;
if( endianTest.testByte[0] == 1 )
return true;
else
return false;
}
template <class T>
inline void swapBytes( T &s )
{
if( sizeof( T ) == 1 )
return;
T d = s;
BytePtr sptr = (BytePtr)&s;
BytePtr dptr = &(((BytePtr)&d)[sizeof(T)-1]);
for( unsigned int i = 0; i < sizeof(T); i++ )
*(sptr++) = *(dptr--);
}
void swapBytes()
{
swapBytes( imagic );
swapBytes( type );
swapBytes( dim );
swapBytes( sizeX );
swapBytes( sizeY );
swapBytes( sizeZ );
swapBytes( wasteBytes );
swapBytes( min );
swapBytes( max );
swapBytes( colorMap );
}
} rawImageRec;
static void ConvertShort(unsigned short *array, long length)
@@ -63,7 +93,6 @@ static void ConvertShort(unsigned short *array, long length)
}
}
static void ConvertLong(GLuint *array, long length)
{
unsigned long b1, b2, b3, b4;
@@ -379,89 +408,94 @@ class ReaderWriterRGB : public osgDB::ReaderWriter
if (!acceptsExtension(ext)) return WriteResult::FILE_NOT_HANDLED;
FILE *fp = fopen(fileName.c_str(), "wb");
if (!fp) return WriteResult::ERROR_IN_WRITING_FILE;
if (!fp)
return WriteResult::ERROR_IN_WRITING_FILE;
rawImageRec raw;
raw.imagic = 0732;
rawImageRec raw;
raw.imagic = 0732;
GLenum dataType = img.getDataType();
GLenum dataType = img.getDataType();
raw.type =
dataType == GL_UNSIGNED_BYTE ? 1 :
dataType == GL_BYTE ? 1 :
dataType == GL_BITMAP ? 1 :
dataType == GL_UNSIGNED_SHORT ? 2 :
dataType == GL_SHORT ? 2 :
dataType == GL_UNSIGNED_INT ? 4 :
dataType == GL_INT ? 4 :
dataType == GL_FLOAT ? 4 :
dataType == GL_UNSIGNED_BYTE_3_3_2 ? 1 :
dataType == GL_UNSIGNED_BYTE_2_3_3_REV ? 1 :
dataType == GL_UNSIGNED_SHORT_5_6_5 ? 2 :
dataType == GL_UNSIGNED_SHORT_5_6_5_REV ? 2 :
dataType == GL_UNSIGNED_SHORT_4_4_4_4 ? 2 :
dataType == GL_UNSIGNED_SHORT_4_4_4_4_REV ? 2 :
dataType == GL_UNSIGNED_SHORT_5_5_5_1 ? 2 :
dataType == GL_UNSIGNED_SHORT_1_5_5_5_REV ? 2 :
dataType == GL_UNSIGNED_INT_8_8_8_8 ? 4 :
dataType == GL_UNSIGNED_INT_8_8_8_8_REV ? 4 :
dataType == GL_UNSIGNED_INT_10_10_10_2 ? 4 :
dataType == GL_UNSIGNED_INT_2_10_10_10_REV ? 4 : 4;
raw.type = dataType == GL_UNSIGNED_BYTE ? 1 :
dataType == GL_BYTE ? 1 :
dataType == GL_BITMAP ? 1 :
dataType == GL_UNSIGNED_SHORT ? 2 :
dataType == GL_SHORT ? 2 :
dataType == GL_UNSIGNED_INT ? 4 :
dataType == GL_INT ? 4 :
dataType == GL_FLOAT ? 4 :
dataType == GL_UNSIGNED_BYTE_3_3_2 ? 1 :
dataType == GL_UNSIGNED_BYTE_2_3_3_REV ? 1 :
dataType == GL_UNSIGNED_SHORT_5_6_5 ? 2 :
dataType == GL_UNSIGNED_SHORT_5_6_5_REV ? 2 :
dataType == GL_UNSIGNED_SHORT_4_4_4_4 ? 2 :
dataType == GL_UNSIGNED_SHORT_4_4_4_4_REV ? 2 :
dataType == GL_UNSIGNED_SHORT_5_5_5_1 ? 2 :
dataType == GL_UNSIGNED_SHORT_1_5_5_5_REV ? 2 :
dataType == GL_UNSIGNED_INT_8_8_8_8 ? 4 :
dataType == GL_UNSIGNED_INT_8_8_8_8_REV ? 4 :
dataType == GL_UNSIGNED_INT_10_10_10_2 ? 4 :
dataType == GL_UNSIGNED_INT_2_10_10_10_REV ? 4 : 4;
GLenum pixelFormat = img.getPixelFormat();
raw.dim =
pixelFormat == GL_COLOR_INDEX? 1 :
pixelFormat == GL_RED? 1 :
pixelFormat == GL_GREEN? 1 :
pixelFormat == GL_BLUE? 1 :
pixelFormat == GL_ALPHA? 1 :
pixelFormat == GL_RGB? 3 :
pixelFormat == GL_BGR ? 3 :
pixelFormat == GL_RGBA? 4 :
pixelFormat == GL_BGRA? 4 :
pixelFormat == GL_LUMINANCE? 1 :
pixelFormat == GL_LUMINANCE_ALPHA ? 2 : 1;
raw.sizeX = img.s();
raw.sizeY = img.t();
raw.sizeZ = raw.dim;
raw.min = 0;
raw.max = 0xFF;
raw.wasteBytes = 0;
strcpy( raw.name, fileName.c_str() );
raw.colorMap = 0;
GLenum pixelFormat = img.getPixelFormat();
raw.dim =
pixelFormat == GL_COLOR_INDEX? 1 :
pixelFormat == GL_RED? 1 :
pixelFormat == GL_GREEN? 1 :
pixelFormat == GL_BLUE? 1 :
pixelFormat == GL_ALPHA? 1 :
pixelFormat == GL_RGB? 3 :
pixelFormat == GL_BGR ? 3 :
pixelFormat == GL_RGBA? 4 :
pixelFormat == GL_BGRA? 4 :
pixelFormat == GL_LUMINANCE? 1 :
pixelFormat == GL_LUMINANCE_ALPHA ? 2 : 1;
raw.sizeX = img.s();
raw.sizeY = img.t();
raw.sizeZ = raw.dim;
raw.min = 0;
raw.max = 0xFF;
raw.wasteBytes = 0;
strcpy( raw.name, fileName.c_str() );
raw.colorMap = 0;
int isize = img.getImageSizeInBytes();
unsigned char *buffer = new unsigned char[isize];
unsigned char *dptr = buffer;
int i, j;
for( i = 0; i < raw.sizeZ; i++ )
{
const unsigned char *ptr = img.data();
ptr += i;
for( j = 0; j < isize/raw.sizeZ; j++ )
{
*(dptr++) = *ptr;
ptr += raw.sizeZ;
}
}
int isize = img.getImageSizeInBytes();
unsigned char *buffer = new unsigned char[isize];
unsigned char *dptr = buffer;
int i, j;
for( i = 0; i < raw.sizeZ; i++ )
{
const unsigned char *ptr = img.data();
ptr += i;
for( j = 0; j < isize/raw.sizeZ; j++ )
{
*(dptr++) = *ptr;
ptr += raw.sizeZ;
}
}
swapBytes( raw.imagic );
swapBytes( raw.type );
swapBytes( raw.dim );
swapBytes( raw.sizeX );
swapBytes( raw.sizeY );
swapBytes( raw.sizeZ );
swapBytes( raw.min );
swapBytes( raw.max );
swapBytes( raw.colorMap );
if( raw.needsBytesSwapped() )
raw.swapBytes();
/*
swapBytes( raw.imagic );
swapBytes( raw.type );
swapBytes( raw.dim );
swapBytes( raw.sizeX );
swapBytes( raw.sizeY );
swapBytes( raw.sizeZ );
swapBytes( raw.min );
swapBytes( raw.max );
swapBytes( raw.colorMap );
*/
char pad[512 - sizeof(rawImageRec)];
memset( pad, 0, sizeof(pad));
char pad[512 - sizeof(rawImageRec)];
memset( pad, 0, sizeof(pad));
fwrite( &raw, sizeof( rawImageRec), 1, fp );
fwrite( pad, sizeof(pad), 1, fp );
fwrite( buffer, isize, 1, fp );
fwrite( &raw, sizeof( rawImageRec), 1, fp );
fwrite( pad, sizeof(pad), 1, fp );
fwrite( buffer, isize, 1, fp );
fclose(fp);
return WriteResult::FILE_SAVED;