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- //
- // Copyright 2008 Christian Henning
- //
- // Distributed under 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_BMP_TAGS_HPP
- #define BOOST_GIL_EXTENSION_IO_BMP_TAGS_HPP
- #include <boost/gil/io/base.hpp>
- namespace boost { namespace gil {
- /// Defines bmp tag.
- struct bmp_tag : format_tag {};
- /// See http://en.wikipedia.org/wiki/BMP_file_format#BMP_File_Header for reference.
- /// Defines type for offset value.
- struct bmp_offset : property_base< uint32_t > {};
- /// Defines type for header sizes.
- struct bmp_header_size : property_base< uint32_t >
- {
- static const type _size = 14; /// Constant size for bmp file header size.
- static const type _win32_info_size = 40; /// Constant size for win32 bmp info header size.
- static const type _os2_info_size = 12; /// Constant size for os2 bmp info header size.
- };
- /// Defines type for image width property.
- struct bmp_image_width : property_base< int32_t > {};
- /// Defines type for image height property.
- struct bmp_image_height : property_base< int32_t > {};
- /// Defines type for bits per pixels property.
- struct bmp_bits_per_pixel : property_base< uint16_t > {};
- /// Defines type for compression property.
- struct bmp_compression : property_base< uint32_t >
- {
- static const type _rgb = 0; /// RGB without compression
- static const type _rle8 = 1; /// 8 bit index with RLE compression
- static const type _rle4 = 2; /// 4 bit index with RLE compression
- static const type _bitfield = 3; /// 16 or 32 bit fields without compression
- };
- /// Defines type for image size property.
- struct bmp_image_size : property_base< uint32_t > {};
- /// Defines type for horizontal resolution property.
- struct bmp_horizontal_resolution : property_base< int32_t > {};
- /// Defines type for vertical resolution property.
- struct bmp_vertical_resolution : property_base< int32_t > {};
- /// Defines type for number of colors property.
- struct bmp_num_colors : property_base< uint32_t > {};
- /// Defines type for important number of colors property.
- struct bmp_num_important_colors : property_base< uint32_t > {};
- /// if height is negative then image is stored top-down instead of bottom-up.
- struct bmp_top_down : property_base< bool > {};
- static const uint32_t bmp_signature = 0x4D42; /// Constant signature for bmp file format.
- /// Read information for bmp images.
- ///
- /// The structure is returned when using read_image_info.
- template<>
- struct image_read_info< bmp_tag >
- {
- /// Default contructor.
- image_read_info< bmp_tag >()
- : _top_down(false)
- , _valid( false )
- {}
- /// The offset, i.e. starting address, of the byte where the bitmap data can be found.
- bmp_offset::type _offset;
- /// The size of this header:
- /// - 40 bytes for Windows V3 header
- /// - 12 bytes for OS/2 V1 header
- bmp_header_size::type _header_size;
- /// The bitmap width in pixels ( signed integer ).
- bmp_image_width::type _width;
- /// The bitmap height in pixels ( signed integer ).
- bmp_image_height::type _height;
- /// The number of bits per pixel, which is the color depth of the image.
- /// Typical values are 1, 4, 8, 16, 24 and 32.
- bmp_bits_per_pixel::type _bits_per_pixel;
- /// The compression method being used. See above for a list of possible values.
- bmp_compression::type _compression;
- /// The image size. This is the size of the raw bitmap data (see below),
- /// and should not be confused with the file size.
- bmp_image_size::type _image_size;
- /// The horizontal resolution of the image. (pixel per meter, signed integer)
- bmp_horizontal_resolution::type _horizontal_resolution;
- /// The vertical resolution of the image. (pixel per meter, signed integer)
- bmp_vertical_resolution::type _vertical_resolution;
- /// The number of colors in the color palette, or 0 to default to 2^n - 1.
- bmp_num_colors::type _num_colors;
- /// The number of important colors used, or 0 when every color is important;
- /// generally ignored.
- bmp_num_important_colors::type _num_important_colors;
- bmp_top_down::type _top_down;
- /// Used internaly to identify is the header has been read.
- bool _valid;
- };
- /// Read settings for bmp images.
- ///
- /// The structure can be used for all read_xxx functions, except read_image_info.
- template<>
- struct image_read_settings< bmp_tag > : public image_read_settings_base
- {
- /// Default constructor
- image_read_settings()
- : image_read_settings_base()
- {}
- /// Constructor
- /// \param top_left Top left coordinate for reading partial image.
- /// \param dim Dimensions for reading partial image.
- image_read_settings( const point_t& top_left
- , const point_t& dim
- )
- : image_read_settings_base( top_left
- , dim
- )
- {}
- };
- /// Write information for bmp images.
- ///
- /// The structure can be used for write_view() function.
- template<>
- struct image_write_info< bmp_tag >
- {
- };
- } // namespace gil
- } // namespace boost
- #endif
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