void
GBitmap::init(ByteStream &ref, int aborder)
{
GMonitorLock lock(monitor());
// Get magic number
char magic[2];
magic[0] = magic[1] = 0;
ref.readall((void*)magic, sizeof(magic));
char lookahead = '\n';
int acolumns = read_integer(lookahead, ref);
int arows = read_integer(lookahead, ref);
init(arows, acolumns, aborder);
// go reading file
if (magic[0]=='P')
{
switch(magic[1])
{
case '1':
grays = 2;
read_pbm_text(ref);
return;
case '2':
grays = 1 + read_integer(lookahead, ref);
if (grays > 256)
G_THROW("Cannot read PGM with depth greater than 8 bits.");
read_pgm_text(ref);
return;
case '4':
grays = 2;
read_pbm_raw(ref);
return;
case '5':
grays = 1 + read_integer(lookahead, ref);
if (grays > 256)
grays = 256;
read_pgm_raw(ref);
return;
}
}
else if (magic[0]=='R')
{
switch(magic[1])
{
case '4':
grays = 2;
read_rle_raw(ref);
return;
}
}
G_THROW( ERR_MSG("GBitmap.bad_format") );
}
void
GBitmap::init(ByteStream &ref, int aborder)
{
GMonitorLock lock(monitor());
#if HAVE_FREEIMAGE
FIBITMAP *dib = ref.fiLoadImage(0);
if (dib == NULL)
G_THROW("File format unrecognized by FreeImage.");
{
FIBITMAP *dib2 = FreeImage_ConvertToGreyscale(dib);
FreeImage_Unload(dib);
if (dib2 == NULL) {
G_THROW("Failed to convert the bitmap to grayscale bitmap.");
}
dib = dib2;
}
// Read image size
int acolumns = FreeImage_GetWidth(dib);
int arows = FreeImage_GetHeight(dib);
init(arows, acolumns, aborder);
// Returns the width of the bitmap in bytes, rounded to the next 32-bit boundary,
// also known as "pitch" or "stride" or "scan width".
unsigned pitch = FreeImage_GetPitch(dib);
const unsigned char* bits = (const unsigned char*)FreeImage_GetBits(dib); // the pointer to the 1 pixel
// Read image data
grays = 256;
unsigned char *row = bytes_data + border;
for (int y = 0; y < nrows; y++) {
const unsigned char *rgb = bits + y*pitch;
for (int x = 0; x < ncolumns; x++) {
row[x] = 255 - rgb[x];
}
row += bytes_per_row;
}
FreeImage_Unload(dib);
#else
// Get magic number
char magic[2];
magic[0] = magic[1] = 0;
ref.readall((void*)magic, sizeof(magic));
char lookahead = '\n';
int acolumns = read_integer(lookahead, ref);
int arows = read_integer(lookahead, ref);
int maxval = 1;
init(arows, acolumns, aborder);
// go reading file
if (magic[0]=='P')
{
switch(magic[1])
{
case '1':
grays = 2;
read_pbm_text(ref);
return;
case '2':
maxval = read_integer(lookahead, ref);
if (maxval > 65535)
G_THROW("Cannot read PGM with depth greater than 16 bits.");
grays = (maxval>255 ? 256 : maxval+1);
read_pgm_text(ref, maxval);
return;
case '4':
grays = 2;
read_pbm_raw(ref);
return;
case '5':
maxval = read_integer(lookahead, ref);
if (maxval > 65535)
G_THROW("Cannot read PGM with depth greater than 16 bits.");
grays = (maxval>255 ? 256 : maxval+1);
read_pgm_raw(ref, maxval);
return;
}
}
else if (magic[0]=='R')
{
switch(magic[1])
{
case '4':
grays = 2;
read_rle_raw(ref);
return;
}
}
G_THROW( ERR_MSG("GBitmap.bad_format") );
#endif
}