170 lines
8.0 KiB
C
170 lines
8.0 KiB
C
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#ifndef IMG_CONVERT_H_
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#define IMG_CONVERT_H_
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// implementation of conversions between basic image types
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// assumes linearity for both source and destination
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// uses CIE 1931 luminance definition for default grayscale conversion:
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// Y = 0.212671*R + 0.715160*G + 0.072169*B
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// assumes 255 for default alpha_value parameter
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#include "img/img_image.h"
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namespace img {
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// Y to RGB
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template<typename SrcScalarType, bool SrcSafe,typename DestScalarType, bool DestSafe>
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inline void convert_Y_to_RGB(const Image<1,SrcScalarType,SrcSafe> &source, Image<3,DestScalarType,DestSafe> &destination)
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{
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assert(source.isValid());
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if(SrcSafe || DestSafe){
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if(!source.isValid()) throw ImageException("Invalid source image");
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}
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destination.setZero(source.width(),source.height());
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for (int y_coord = 0; y_coord < source.height(); ++y_coord)
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for (int x_coord = 0; x_coord < source.width(); ++x_coord){
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DestScalarType Y = static_cast<DestScalarType>(source.getValue(x_coord, y_coord, 0));
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destination.setValue(x_coord, y_coord, 0, Y);
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destination.setValue(x_coord, y_coord, 1, Y);
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destination.setValue(x_coord, y_coord, 2, Y);
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}
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destination.attributes.setRange(source.attributes);
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destination.attributes.setGamma(source.attributes);
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}
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// Y to RGBA
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template<typename SrcScalarType, bool SrcSafe,typename DestScalarType, bool DestSafe>
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inline void convert_Y_to_RGBA(const Image<1,SrcScalarType,SrcSafe> &source, Image<4,DestScalarType,DestSafe> &destination, DestScalarType alpha_value=255.0f )
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{
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assert(source.isValid());
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if(SrcSafe || DestSafe){
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if(!source.isValid()) throw ImageException("Invalid source image");
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}
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destination.setZero(source.width(),source.height());
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for (int y_coord = 0; y_coord < source.height(); ++y_coord)
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for (int x_coord = 0; x_coord < source.width(); ++x_coord){
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DestScalarType Y = static_cast<DestScalarType>(source.getValue(x_coord, y_coord, 0));
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destination.setValue(x_coord, y_coord, 0, Y);
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destination.setValue(x_coord, y_coord, 1, Y);
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destination.setValue(x_coord, y_coord, 2, Y);
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destination.setValue(x_coord, y_coord, 3, alpha_value);
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}
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destination.attributes.setRange(source.attributes);
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destination.attributes.setGamma(source.attributes);
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}
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// RGB to Y
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template<typename SrcScalarType, bool SrcSafe,typename DestScalarType, bool DestSafe>
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inline void convert_RGB_to_Y(const Image<3,SrcScalarType,SrcSafe> &source, Image<1,DestScalarType,DestSafe> &destination)
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{
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assert(source.isValid());
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if(SrcSafe || DestSafe){
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if(!source.isValid()) throw ImageException("Invalid source image");
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}
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destination.setZero(source.width(),source.height());
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for (int y_coord = 0; y_coord < source.height(); ++y_coord)
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for (int x_coord = 0; x_coord < source.width(); ++x_coord){
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DestScalarType R = static_cast<DestScalarType>(source.getValue(x_coord, y_coord, 0));
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DestScalarType G = static_cast<DestScalarType>(source.getValue(x_coord, y_coord, 1));
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DestScalarType B = static_cast<DestScalarType>(source.getValue(x_coord, y_coord, 2));
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destination.setValue(x_coord, y_coord, 0, 0.212671f*R + 0.715160f*G + 0.072169f*B);
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}
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destination.attributes.setRange(source.attributes);
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destination.attributes.setGamma(source.attributes);
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}
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// RGB to RGBA
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template<typename SrcScalarType, bool SrcSafe,typename DestScalarType, bool DestSafe>
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inline void convert_RGB_to_RGBA(const Image<3,SrcScalarType,SrcSafe> &source, Image<4,DestScalarType,DestSafe> &destination, DestScalarType alpha_value=255.0f )
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{
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assert(source.isValid());
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if(SrcSafe || DestSafe){
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if(!source.isValid()) throw ImageException("Invalid source image");
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}
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destination.setZero(source.width(),source.height());
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for (int y_coord = 0; y_coord < source.height(); ++y_coord)
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for (int x_coord = 0; x_coord < source.width(); ++x_coord){
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destination.setValue(x_coord, y_coord, 0, static_cast<DestScalarType>(source.getValue(x_coord, y_coord, 0)));
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destination.setValue(x_coord, y_coord, 1, static_cast<DestScalarType>(source.getValue(x_coord, y_coord, 1)));
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destination.setValue(x_coord, y_coord, 2, static_cast<DestScalarType>(source.getValue(x_coord, y_coord, 2)));
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destination.setValue(x_coord, y_coord, 3, alpha_value);
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}
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destination.attributes.setRange(source.attributes);
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destination.attributes.setGamma(source.attributes);
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}
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// RGBA to Y
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template<typename SrcScalarType, bool SrcSafe,typename DestScalarType, bool DestSafe>
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inline void convert_RGBA_to_Y(const Image<4,SrcScalarType,SrcSafe> &source, Image<1,DestScalarType,DestSafe> &destination)
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{
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assert(source.isValid());
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if(SrcSafe || DestSafe){
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if(!source.isValid()) throw ImageException("Invalid source image");
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}
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destination.setZero(source.width(),source.height());
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for (int y_coord = 0; y_coord < source.height(); ++y_coord)
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for (int x_coord = 0; x_coord < source.width(); ++x_coord){
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DestScalarType R = static_cast<DestScalarType>(source.getValue(x_coord, y_coord, 0));
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DestScalarType G = static_cast<DestScalarType>(source.getValue(x_coord, y_coord, 1));
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DestScalarType B = static_cast<DestScalarType>(source.getValue(x_coord, y_coord, 2));
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destination.setValue(x_coord, y_coord, 0, 0.212671f*R + 0.715160f*G + 0.072169f*B);
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}
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destination.attributes.setRange(source.attributes);
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destination.attributes.setGamma(source.attributes);
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}
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// RGBA to RGB
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template<typename SrcScalarType, bool SrcSafe,typename DestScalarType, bool DestSafe>
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inline void convert_RGBA_to_RGB(const Image<4,SrcScalarType,SrcSafe> &source, Image<3,DestScalarType,DestSafe> &destination)
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{
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assert(source.isValid());
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if(SrcSafe || DestSafe){
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if(!source.isValid()) throw ImageException("Invalid source image");
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}
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destination.setZero(source.width(),source.height());
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for (int y_coord = 0; y_coord < source.height(); ++y_coord)
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for (int x_coord = 0; x_coord < source.width(); ++x_coord){
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destination.setValue(x_coord, y_coord, 0, static_cast<DestScalarType>(source.getValue(x_coord, y_coord, 0)));
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destination.setValue(x_coord, y_coord, 1, static_cast<DestScalarType>(source.getValue(x_coord, y_coord, 1)));
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destination.setValue(x_coord, y_coord, 2, static_cast<DestScalarType>(source.getValue(x_coord, y_coord, 2)));
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}
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destination.attributes.setRange(source.attributes);
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destination.attributes.setGamma(source.attributes);
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}
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// range conversion
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template<int Channels, typename SrcScalarType, bool SrcSafe, typename DestScalarType, bool DestSafe>
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inline void convert_range_0_255_to_0_1(const Image<Channels,SrcScalarType,SrcSafe> &source, Image<Channels,DestScalarType,DestSafe> &destination)
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{
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assert(source.isValid());
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assert(source.attributes.hasRange(0,255));
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if(SrcSafe || DestSafe){
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if(!source.isValid()) throw ImageException("Invalid source image");
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if(!source.attributes.hasRange(0,255)) throw ImageException("Invalid range attribute");
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}
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destination.setZero(source.width(),source.height());
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for(int offset=0;offset<source.dataValuesSize();offset++)
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destination.dataValues()[offset] = static_cast<DestScalarType>(source.dataValues()[offset]) / DestScalarType(255.0);
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destination.attributes=source.attributes;
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destination.attributes.setRange(0,1);
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}
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template<int Channels, typename SrcScalarType, bool SrcSafe, typename DestScalarType, bool DestSafe>
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inline void convert_range_0_1_to_0_255(const Image<Channels,SrcScalarType,SrcSafe> &source, Image<Channels,DestScalarType,DestSafe> &destination)
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{
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assert(source.isValid());
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assert(source.attributes.hasRange(0,1));
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if(SrcSafe || DestSafe){
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if(!source.isValid()) throw ImageException("Invalid source image");
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if(!source.attributes.hasRange(0,1)) throw ImageException("Invalid range attribute");
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}
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destination.setZero(source.width(),source.height());
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for(int offset=0;offset<source.dataValuesSize();offset++)
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destination.dataValues()[offset] = static_cast<DestScalarType>(source.dataValues()[offset]) * DestScalarType(255.0);
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destination.attributes=source.attributes;
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destination.attributes.setRange(0,255);
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}
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} //end namespace img
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#endif /*IMG_CONVERT_H_*/
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