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/*
* Modification History
*
* 2001-September-24 Jason Rohrer
* Created.
*/
#include "minorGems/graphics/Image.h"
#include "minorGems/graphics/ImageColorConverter.h"
#include "minorGems/graphics/converters/TGAImageConverter.h"
#include "minorGems/io/file/File.h"
#include "minorGems/io/file/FileInputStream.h"
#include "minorGems/io/file/FileOutputStream.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void usage( char *inAppName );
Image *loadTGAImage( char *inFileName );
void writeTGAImage( char *inFileName, Image *inImage );
// normalizes an image into the pixel range [0,1] if some
// pixels are out of range
void normalizeImage( Image *inImage );
// a test program that converts a tga image between
// parameterizable color formats
int main( char inNumArgs, char **inArgs ) {
if( inNumArgs != 5 ) {
usage( inArgs[0] );
}
Image *inImage = loadTGAImage( inArgs[1] );
Image *outImage;
// convert inImage to outImage based on the color space strings
if( !strcmp( inArgs[3], "rgb" ) ) {
if( !strcmp( inArgs[4], "yiq" ) ) {
outImage = ImageColorConverter::RGBToYIQ( inImage );
}
if( !strcmp( inArgs[4], "ycbcr" ) ) {
outImage = ImageColorConverter::RGBToYCbCr( inImage );
}
}
if( !strcmp( inArgs[3], "yiq" ) ) {
if( !strcmp( inArgs[4], "rgb" ) ) {
outImage = ImageColorConverter::YIQToRGB( inImage );
}
if( !strcmp( inArgs[4], "ycbcr" ) ) {
Image *tempImage = ImageColorConverter::YIQToRGB( inImage );
outImage = ImageColorConverter::RGBToYCbCr( tempImage );
delete tempImage;
}
}
if( !strcmp( inArgs[3], "ycbcr" ) ) {
if( !strcmp( inArgs[4], "rgb" ) ) {
outImage = ImageColorConverter::YCbCrToRGB( inImage );
}
if( !strcmp( inArgs[4], "yiq" ) ) {
Image *tempImage = ImageColorConverter::YCbCrToRGB( inImage );
outImage = ImageColorConverter::RGBToYIQ( tempImage );
delete tempImage;
}
}
writeTGAImage( inArgs[2], outImage );
delete inImage;
delete outImage;
return 0;
}
void usage( char *inAppName ) {
printf( "Usage:\n" );
printf( "\t%s in_image_tga out_image_tga in_format out_format\n",
inAppName );
printf( "Example:\n" );
printf( "\t%s testRGB.tga testYIQ.bmp rgb yiq\n", inAppName );
printf( "The following color formats are supported:\n" );
printf( "\trgb, yiq, ycbcr\n" );
exit( 1 );
}
void normalizeImage( Image *inImage ) {
// now normalize the image so that pixels are in the range [0,1]
int numPixels = inImage->getWidth() * inImage->getHeight();
int numChannels = inImage->getNumChannels();
double minValue = 1000.0;
double maxValue = -1000.0;
int c;
// search for min and max values
for( c=0; c<numChannels; c++ ) {
double *channel = inImage->getChannel( c );
for( int p=0; p<numPixels; p++ ) {
if( channel[p] < minValue ) {
minValue = channel[p];
}
else if( channel[p] > maxValue ) {
maxValue = channel[p];
}
}
}
double diff = maxValue - minValue;
if( minValue >= 0 && diff + minValue <= 1 ) {
// no need to normalize, as values are already
// in range
return;
}
double scale = 1.0 / diff;
// now normalize all pixels
for( c=0; c<numChannels; c++ ) {
double *channel = inImage->getChannel( c );
for( int p=0; p<numPixels; p++ ) {
channel[p] = ( channel[p] - minValue ) * scale;
}
}
}
Image *loadTGAImage( char *inFileName ) {
File *imageFile = new File( NULL, inFileName,
strlen( inFileName ) );
FileInputStream *imageStream
= new FileInputStream( imageFile );
TGAImageConverter *converter = new TGAImageConverter();
Image *returnImage = converter->deformatImage( imageStream );
delete imageFile;
delete imageStream;
delete converter;
return returnImage;
}
void writeTGAImage( char *inFileName, Image *inImage ) {
File *imageFile = new File( NULL, inFileName,
strlen( inFileName ) );
FileOutputStream *imageStream
= new FileOutputStream( imageFile );
TGAImageConverter *converter = new TGAImageConverter();
converter->formatImage( inImage, imageStream );
delete imageFile;
delete imageStream;
delete converter;
}
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