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Diffstat (limited to 'ml/dlib/dlib/image_loader/png_loader.cpp')
-rw-r--r--ml/dlib/dlib/image_loader/png_loader.cpp222
1 files changed, 0 insertions, 222 deletions
diff --git a/ml/dlib/dlib/image_loader/png_loader.cpp b/ml/dlib/dlib/image_loader/png_loader.cpp
deleted file mode 100644
index 3346ddb6a..000000000
--- a/ml/dlib/dlib/image_loader/png_loader.cpp
+++ /dev/null
@@ -1,222 +0,0 @@
-// Copyright (C) 2008 Davis E. King (davis@dlib.net), Nils Labugt
-// License: Boost Software License See LICENSE.txt for the full license.
-#ifndef DLIB_PNG_LOADER_CPp_
-#define DLIB_PNG_LOADER_CPp_
-
-// only do anything with this file if DLIB_PNG_SUPPORT is defined
-#ifdef DLIB_PNG_SUPPORT
-
-#include "../array2d.h"
-#include "../pixel.h"
-#include "../dir_nav.h"
-#include "png_loader.h"
-#include <png.h>
-#include "../string.h"
-#include "../byte_orderer.h"
-#include <sstream>
-#include <cstring>
-
-namespace dlib
-{
-
-// ----------------------------------------------------------------------------------------
-
- struct LibpngData
- {
- png_bytep* row_pointers_;
- png_structp png_ptr_;
- png_infop info_ptr_;
- png_infop end_info_;
- };
-
-// ----------------------------------------------------------------------------------------
-
- png_loader::
- png_loader( const char* filename ) : height_( 0 ), width_( 0 )
- {
- read_image( filename );
- }
-
-// ----------------------------------------------------------------------------------------
-
- png_loader::
- png_loader( const std::string& filename ) : height_( 0 ), width_( 0 )
- {
- read_image( filename.c_str() );
- }
-
-// ----------------------------------------------------------------------------------------
-
- png_loader::
- png_loader( const dlib::file& f ) : height_( 0 ), width_( 0 )
- {
- read_image( f.full_name().c_str() );
- }
-
-// ----------------------------------------------------------------------------------------
-
- const unsigned char* png_loader::get_row( unsigned i ) const
- {
- return ld_->row_pointers_[i];
- }
-
-// ----------------------------------------------------------------------------------------
-
- png_loader::~png_loader()
- {
- if ( ld_ && ld_->row_pointers_ != NULL )
- png_destroy_read_struct( &( ld_->png_ptr_ ), &( ld_->info_ptr_ ), &( ld_->end_info_ ) );
- }
-
-// ----------------------------------------------------------------------------------------
-
- bool png_loader::is_gray() const
- {
- return ( color_type_ == PNG_COLOR_TYPE_GRAY );
- }
-
-// ----------------------------------------------------------------------------------------
-
- bool png_loader::is_graya() const
- {
- return ( color_type_ == PNG_COLOR_TYPE_GRAY_ALPHA );
- }
-
-// ----------------------------------------------------------------------------------------
-
- bool png_loader::is_rgb() const
- {
- return ( color_type_ == PNG_COLOR_TYPE_RGB );
- }
-
-// ----------------------------------------------------------------------------------------
-
- bool png_loader::is_rgba() const
- {
- return ( color_type_ == PNG_COLOR_TYPE_RGB_ALPHA );
- }
-
-// ----------------------------------------------------------------------------------------
-
- // Don't do anything when libpng calls us to tell us about an error. Just return to
- // our own code and throw an exception (at the long jump target).
- void png_loader_user_error_fn_silent(png_structp png_struct, png_const_charp )
- {
- longjmp(png_jmpbuf(png_struct),1);
- }
- void png_loader_user_warning_fn_silent(png_structp , png_const_charp )
- {
- }
-
- void png_loader::read_image( const char* filename )
- {
- ld_.reset(new LibpngData);
- if ( filename == NULL )
- {
- throw image_load_error("png_loader: invalid filename, it is NULL");
- }
- FILE *fp = fopen( filename, "rb" );
- if ( !fp )
- {
- throw image_load_error(std::string("png_loader: unable to open file ") + filename);
- }
- png_byte sig[8];
- if (fread( sig, 1, 8, fp ) != 8)
- {
- fclose( fp );
- throw image_load_error(std::string("png_loader: error reading file ") + filename);
- }
- if ( png_sig_cmp( sig, 0, 8 ) != 0 )
- {
- fclose( fp );
- throw image_load_error(std::string("png_loader: format error in file ") + filename);
- }
- ld_->png_ptr_ = png_create_read_struct( PNG_LIBPNG_VER_STRING, NULL, &png_loader_user_error_fn_silent, &png_loader_user_warning_fn_silent );
- if ( ld_->png_ptr_ == NULL )
- {
- fclose( fp );
- std::ostringstream sout;
- sout << "Error, unable to allocate png structure while opening file " << filename << std::endl;
- const char* runtime_version = png_get_header_ver(NULL);
- if (runtime_version && std::strcmp(PNG_LIBPNG_VER_STRING, runtime_version) != 0)
- {
- sout << "This is happening because you compiled against one version of libpng, but then linked to another." << std::endl;
- sout << "Compiled against libpng version: " << PNG_LIBPNG_VER_STRING << std::endl;
- sout << "Linking to this version of libpng: " << runtime_version << std::endl;
- }
- throw image_load_error(sout.str());
- }
- ld_->info_ptr_ = png_create_info_struct( ld_->png_ptr_ );
- if ( ld_->info_ptr_ == NULL )
- {
- fclose( fp );
- png_destroy_read_struct( &( ld_->png_ptr_ ), ( png_infopp )NULL, ( png_infopp )NULL );
- throw image_load_error(std::string("png_loader: parse error in file ") + filename);
- }
- ld_->end_info_ = png_create_info_struct( ld_->png_ptr_ );
- if ( ld_->end_info_ == NULL )
- {
- fclose( fp );
- png_destroy_read_struct( &( ld_->png_ptr_ ), &( ld_->info_ptr_ ), ( png_infopp )NULL );
- throw image_load_error(std::string("png_loader: parse error in file ") + filename);
- }
-
- if (setjmp(png_jmpbuf(ld_->png_ptr_)))
- {
- // If we get here, we had a problem writing the file
- fclose(fp);
- png_destroy_read_struct( &( ld_->png_ptr_ ), &( ld_->info_ptr_ ), &( ld_->end_info_ ) );
- throw image_load_error(std::string("png_loader: parse error in file ") + filename);
- }
-
- png_set_palette_to_rgb(ld_->png_ptr_);
-
- png_init_io( ld_->png_ptr_, fp );
- png_set_sig_bytes( ld_->png_ptr_, 8 );
- // flags force one byte per channel output
- byte_orderer bo;
- int png_transforms = PNG_TRANSFORM_PACKING;
- if (bo.host_is_little_endian())
- png_transforms |= PNG_TRANSFORM_SWAP_ENDIAN;
- png_read_png( ld_->png_ptr_, ld_->info_ptr_, png_transforms, NULL );
- height_ = png_get_image_height( ld_->png_ptr_, ld_->info_ptr_ );
- width_ = png_get_image_width( ld_->png_ptr_, ld_->info_ptr_ );
- bit_depth_ = png_get_bit_depth( ld_->png_ptr_, ld_->info_ptr_ );
- color_type_ = png_get_color_type( ld_->png_ptr_, ld_-> info_ptr_ );
-
-
- if (color_type_ != PNG_COLOR_TYPE_GRAY &&
- color_type_ != PNG_COLOR_TYPE_RGB &&
- color_type_ != PNG_COLOR_TYPE_RGB_ALPHA &&
- color_type_ != PNG_COLOR_TYPE_GRAY_ALPHA)
- {
- fclose( fp );
- png_destroy_read_struct( &( ld_->png_ptr_ ), &( ld_->info_ptr_ ), &( ld_->end_info_ ) );
- throw image_load_error(std::string("png_loader: unsupported color type in file ") + filename);
- }
-
- if (bit_depth_ != 8 && bit_depth_ != 16)
- {
- fclose( fp );
- png_destroy_read_struct( &( ld_->png_ptr_ ), &( ld_->info_ptr_ ), &( ld_->end_info_ ) );
- throw image_load_error("png_loader: unsupported bit depth of " + cast_to_string(bit_depth_) + " in file " + std::string(filename));
- }
-
- ld_->row_pointers_ = png_get_rows( ld_->png_ptr_, ld_->info_ptr_ );
-
- fclose( fp );
- if ( ld_->row_pointers_ == NULL )
- {
- png_destroy_read_struct( &( ld_->png_ptr_ ), &( ld_->info_ptr_ ), &( ld_->end_info_ ) );
- throw image_load_error(std::string("png_loader: parse error in file ") + filename);
- }
- }
-
-// ----------------------------------------------------------------------------------------
-
-}
-
-#endif // DLIB_PNG_SUPPORT
-
-#endif // DLIB_PNG_LOADER_CPp_
-
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