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/************************************************************************
Raster image support.
$Id: raster.cxx 427 2004-09-27 04:45:31Z garland $
************************************************************************/
#include <gfx/gfx.h>
#include <gfx/raster.h>
#include <string>
#include <cctype>
#include <cstring>
namespace gfx
{
ByteRaster::ByteRaster(const ByteRaster &img)
: Raster<unsigned char>(img.width(), img.height(), img.channels())
{
memcpy(head(), img.head(), img.length()*sizeof(unsigned char));
}
ByteRaster::ByteRaster(const FloatRaster &img)
: Raster<unsigned char>(img.width(), img.height(), img.channels())
{
for(int i=0; i<length(); i++ )
(*this)[i] = (unsigned char) (255.0f * img[i]);
}
FloatRaster::FloatRaster(const ByteRaster &img)
: Raster<float>(img.width(), img.height(), img.channels())
{
for(int i=0; i<length(); i++)
(*this)[i] = (float)img[i] / 255.0f;
}
FloatRaster::FloatRaster(const FloatRaster &img)
: Raster<float>(img.width(), img.height(), img.channels())
{
memcpy(head(), img.head(), img.length()*sizeof(float));
}
////////////////////////////////////////////////////////////////////////
//
// Table of supported formats
//
static char *img_names[] = {"PPM", "PNG", "TIFF", "JPEG"};
static char *img_ext[] = {"ppm", "png", "tif", "jpg"};
const char *image_type_name(int type)
{ return type>=IMG_LIMIT ? NULL : img_names[type]; }
const char *image_type_ext(int type)
{ return type>=IMG_LIMIT ? NULL : img_ext[type]; }
int infer_image_type(const char *filename)
{
const char *ext = strrchr(filename, '.');
if( !ext ) return -1;
// Make sure extension is lower case
std::string lo(ext+1);
for(int i=0; i<lo.length(); i++) lo[i] = tolower(lo[i]);
// Search for extension in the table
for(int typ=0; typ<IMG_LIMIT; typ++)
if(lo == img_ext[typ]) return typ;
// Test for alternatives
if(lo=="tiff") return IMG_TIFF;
// Unknown type
return -1;
}
bool write_image(const char *filename, const ByteRaster& img, int type)
{
if( type<0 )
type = infer_image_type(filename);
switch( type )
{
case IMG_PNM: return write_pnm_image(filename, img);
case IMG_PNG: return write_png_image(filename, img);
case IMG_TIFF: return write_tiff_image(filename, img);
case IMG_JPEG: return write_jpeg_image(filename, img);
default: return false;
}
}
ByteRaster *read_image(const char *filename, int type)
{
if( type<0 )
type = infer_image_type(filename);
switch( type )
{
case IMG_PNM: return read_pnm_image(filename);
case IMG_PNG: return read_png_image(filename);
case IMG_TIFF: return read_tiff_image(filename);
case IMG_JPEG: return read_jpeg_image(filename);
default: return NULL;
}
}
} // namespace gfx
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