coco
136 lines
3.8 KiB
C++
136 lines
3.8 KiB
C++
// Copyright (C) 2010 Davis E. King (davis@dlib.net), Nils Labugt
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// License: Boost Software License See LICENSE.txt for the full license.
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#ifndef DLIB_JPEG_IMPORT
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#define DLIB_JPEG_IMPORT
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#include <vector>
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#include "jpeg_loader_abstract.h"
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#include "image_loader.h"
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#include "../pixel.h"
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#include "../dir_nav.h"
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#include "../test_for_odr_violations.h"
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namespace dlib
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{
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class jpeg_loader : noncopyable
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{
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public:
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jpeg_loader( const char* filename );
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jpeg_loader( const std::string& filename );
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jpeg_loader( const dlib::file& f );
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jpeg_loader( const unsigned char* imgbuffer, size_t buffersize );
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bool is_gray() const;
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bool is_rgb() const;
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bool is_rgba() const;
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template<typename T>
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void get_image( T& t_) const
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{
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#ifndef DLIB_JPEG_SUPPORT
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/* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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You are getting this error because you are trying to use the jpeg_loader
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object but you haven't defined DLIB_JPEG_SUPPORT. You must do so to use
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this object. You must also make sure you set your build environment
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to link against the libjpeg library.
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*/
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COMPILE_TIME_ASSERT(sizeof(T) == 0);
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#endif
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image_view<T> t(t_);
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t.set_size( height_, width_ );
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for ( unsigned n = 0; n < height_;n++ )
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{
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const unsigned char* v = get_row( n );
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for ( unsigned m = 0; m < width_;m++ )
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{
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if ( is_gray() )
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{
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unsigned char p = v[m];
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assign_pixel( t[n][m], p );
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}
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else if ( is_rgba() ) {
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rgb_alpha_pixel p;
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p.red = v[m*4];
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p.green = v[m*4+1];
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p.blue = v[m*4+2];
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p.alpha = v[m*4+3];
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assign_pixel( t[n][m], p );
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}
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else // if ( is_rgb() )
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{
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rgb_pixel p;
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p.red = v[m*3];
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p.green = v[m*3+1];
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p.blue = v[m*3+2];
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assign_pixel( t[n][m], p );
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}
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}
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}
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}
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private:
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const unsigned char* get_row( unsigned long i ) const
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{
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return &data[i*width_*output_components_];
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}
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FILE * check_file(const char* filename );
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void read_image( FILE *file, const unsigned char* imgbuffer, size_t imgbuffersize );
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unsigned long height_;
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unsigned long width_;
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unsigned long output_components_;
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std::vector<unsigned char> data;
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};
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// ----------------------------------------------------------------------------------------
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template <
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typename image_type
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>
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void load_jpeg (
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image_type& image,
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const std::string& file_name
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)
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{
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jpeg_loader(file_name).get_image(image);
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}
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template <
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typename image_type
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>
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void load_jpeg (
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image_type& image,
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const unsigned char* imgbuff,
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size_t imgbuffsize
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)
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{
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jpeg_loader(imgbuff, imgbuffsize).get_image(image);
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}
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template <
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typename image_type
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>
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void load_jpeg (
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image_type& image,
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const char* imgbuff,
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size_t imgbuffsize
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)
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{
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jpeg_loader(reinterpret_cast<const unsigned char*>(imgbuff), imgbuffsize).get_image(image);
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}
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// ----------------------------------------------------------------------------------------
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}
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#ifdef NO_MAKEFILE
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#include "jpeg_loader.cpp"
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#endif
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#endif // DLIB_JPEG_IMPORT
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