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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31#ifndef PNGPP_PACKED_PIXEL_HPP_INCLUDED
32#define PNGPP_PACKED_PIXEL_HPP_INCLUDED
33
34#include "types.hpp"
35
36namespace 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 >
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
Definition packed_pixel.hpp:41
The packed pixel class template.
Definition packed_pixel.hpp:56
static int get_bit_depth()
Definition packed_pixel.hpp:68
static byte get_bit_mask()
Definition packed_pixel.hpp:73
packed_pixel(byte value=0)
Definition packed_pixel.hpp:58
The PNG reader class template. This is the low-level reading interface–use image class or consumer cl...
Definition reader.hpp:67
Definition color.hpp:37
png_byte byte
Definition types.hpp:39