WIP. Scale cover art option. Seems to work

2014-06-14 20:44:03 +02:00
parent 1d67a548c9
commit 9bada5ee2a
92 changed files with 15866 additions and 1890 deletions
@@ -0,0 +1,99 @@
+/*
+    Copyright 2007-2008 Christian Henning, Andreas Pokorny, Lubomir Bourdev
+    Use, modification and distribution are subject to the Boost Software License,
+    Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+    http://www.boost.org/LICENSE_1_0.txt).
+*/
+
+/*************************************************************************************************/
+
+#ifndef BOOST_GIL_EXTENSION_IO_DETAIL_PNG_IO_BASE_HPP
+#define BOOST_GIL_EXTENSION_IO_DETAIL_PNG_IO_BASE_HPP
+
+////////////////////////////////////////////////////////////////////////////////////////
+/// \file
+/// \brief
+/// \author Christian Henning, Andreas Pokorny, Lubomir Bourdev \n
+///
+/// \date   2007-2008 \n
+///
+////////////////////////////////////////////////////////////////////////////////////////
+
+#include <boost/gil/extension/io_new/png_tags.hpp>
+
+#include <boost/gil/extension/io_new/detail/base.hpp>
+#include <boost/gil/extension/io_new/detail/reader_base.hpp>
+#include <boost/gil/extension/io_new/detail/io_device.hpp>
+#include <boost/gil/extension/io_new/detail/typedefs.hpp>
+
+namespace boost { namespace gil { namespace detail {
+
+template<typename Device>
+class png_io_base
+{
+public:
+    png_io_base( Device & io_dev )
+        : _io_dev(io_dev)
+    {}
+
+protected:
+    Device & _io_dev;
+
+    void check() const
+    {
+        byte_t buf[PNG_BYTES_TO_CHECK];
+
+        io_error_if(_io_dev.read(buf, PNG_BYTES_TO_CHECK) != PNG_BYTES_TO_CHECK,
+                "png_check_validity: failed to read image");
+
+        io_error_if(png_sig_cmp(png_bytep(buf), png_size_t(0), PNG_BYTES_TO_CHECK)!=0,
+                "png_check_validity: invalid png image");
+    }
+
+    static void read_data( png_structp png_ptr
+                         , png_bytep   data
+                         , png_size_t length
+                         )
+    {
+        static_cast<Device*>(png_get_io_ptr(png_ptr) )->read( data
+                                                            , length );
+    }
+
+    static void write_data( png_structp png_ptr
+                          , png_bytep   data
+                          , png_size_t  length
+                          )
+    {
+        static_cast<Device*>( png_get_io_ptr( png_ptr ))->write( data
+                                                               , length );
+    }
+
+    static void flush( png_structp png_ptr )
+    {
+        static_cast<Device*>(png_get_io_ptr(png_ptr) )->flush();
+    }
+
+
+    static int read_user_chunk_callback( png_struct*        /* png_ptr */
+                                       , png_unknown_chunkp /* chunk */
+                                       )
+    {
+        // @todo
+        return 0;
+    }
+
+    static void read_row_callback( png_structp /* png_ptr    */
+                                 , png_uint_32 /* row_number */
+                                 , int         /* pass       */
+                                 )
+    {
+        // @todo
+    }
+
+};
+
+} // namespace detail
+} // namespace gil
+} // namespace boost
+
+#endif // BOOST_GIL_EXTENSION_IO_DETAIL_PNG_IO_BASE_HPP