png++ 0.2.10

packed_pixel.hpp
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1/*
2 * Copyright (C) 2007,2008 Alex Shulgin
3 *
4 * This file is part of png++ the C++ wrapper for libpng. PNG++ is free
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8 * modification, are permitted provided that the following conditions are met:
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10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
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20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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30 */
31#ifndef PNGPP_PACKED_PIXEL_HPP_INCLUDED
32#define PNGPP_PACKED_PIXEL_HPP_INCLUDED
33
34#include "types.hpp"
35
36 namespace png
37{
38
39 namespace detail
40 {
41 template< int bits > class allowed_bit_depth;
42
43 template<> class allowed_bit_depth< 1 > {};
44 template<> class allowed_bit_depth< 2 > {};
45 template<> class allowed_bit_depth< 4 > {};
46 } // namespace detail
47
53 template< int bits >
54 class packed_pixel
55 : detail::allowed_bit_depth< bits >
56 {
57 public:
58 packed_pixel(byte value = 0)
59 : m_value(value & get_bit_mask())
60 {
61 }
62
63 operator byte() const
64 {
65 return m_value;
66 }
67
68 static int get_bit_depth()
69 {
70 return bits;
71 }
72
73 static byte get_bit_mask()
74 {
75 return (1 << bits) - 1;
76 }
77
78 private:
79 byte m_value;
80 };
81
82} // namespace png
83
84#endif // PNGPP_PACKED_PIXEL_HPP_INCLUDED
png::detail::allowed_bit_depth
Definition packed_pixel.hpp:41
png::packed_pixel::get_bit_depth
static int get_bit_depth()
Definition packed_pixel.hpp:68
png::packed_pixel::get_bit_mask
static byte get_bit_mask()
Definition packed_pixel.hpp:73
png::packed_pixel::packed_pixel
packed_pixel(byte value=0)
Definition packed_pixel.hpp:58
png::detail
Definition convert_color_space.hpp:47
png
Definition color.hpp:37
png::byte
png_byte byte
Definition types.hpp:39
types.hpp