png++: streaming_base.hpp Source File

png++ 0.2.10

streaming_base.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
5 * software; the exact copying conditions are as follows:
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * 3. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
23 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
25 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31 #ifndef PNGPP_STREAMING_BASE_HPP_INCLUDED
32 #define PNGPP_STREAMING_BASE_HPP_INCLUDED
33
34 #include <cassert>
35 #include "image_info.hpp"
36 #include "pixel_traits.hpp"
37
38 namespace png
39 {
40
45 class def_image_info_holder
46 {
47 public:
48 def_image_info_holder(image_info const& info)
49 : m_info(info)
50 {
51 }
52
53 image_info& get_info()
54 {
55 return m_info;
56 }
57
58 private:
59 image_info m_info;
60 };
61
67 class image_info_ref_holder
68 {
69 public:
70 image_info_ref_holder(image_info& info)
71 : m_info(info)
72 {
73 }
74
75 image_info& get_info()
76 {
77 return m_info;
78 }
79
80 private:
81 image_info& m_info;
82 };
83
89 template< typename pixel, class info_holder >
90 class streaming_base
91 {
92 public:
93 typedef pixel_traits< pixel > traits;
94
95 explicit streaming_base(image_info& info)
96 : m_info_holder(info)
97 {
98 }
99
100 streaming_base(uint_32 width, uint_32 height)
101 : m_info_holder(make_image_info< pixel >())
102 {
103 get_info().set_width(width);
104 get_info().set_height(height);
105 }
106
107 image_info const& get_info() const
108 {
109 return m_info_holder.get_info();
110 }
111
112 protected:
113 void reset(size_t /*pass*/)
114 {
115 // nothing to do in the most general case
116 }
117
118 image_info& get_info()
119 {
120 return m_info_holder.get_info();
121 }
122
123 info_holder m_info_holder;
124 };
125
126 } // namespace png
127
128 #endif // PNGPP_STREAMING_BASE_HPP_INCLUDED
png::image_info_ref_holder
An image_info holder class. Stores a reference to the image_info object. The image_info object itself...
Definition: streaming_base.hpp:68
png::info
Holds information about PNG image. Adapter class for IO image operations.
Definition: info.hpp:48
png::def_image_info_holder::get_info
image_info & get_info()
Definition: streaming_base.hpp:53
png::def_image_info_holder::def_image_info_holder
def_image_info_holder(image_info const &info)
Definition: streaming_base.hpp:48
pixel_traits.hpp
png::image_info_ref_holder::get_info
image_info & get_info()
Definition: streaming_base.hpp:75
png::image_info
Holds information about PNG image.
Definition: image_info.hpp:48
png::image_info_ref_holder::image_info_ref_holder
image_info_ref_holder(image_info &info)
Definition: streaming_base.hpp:70
png::streaming_base
A base class template for consumer and generator classes. Provides default reset() method implementat...
Definition: streaming_base.hpp:91
png::uint_32
png_uint_32 uint_32
Definition: types.hpp:41
png::streaming_base::reset
void reset(size_t)
Definition: streaming_base.hpp:113
png::image_info::set_width
void set_width(uint_32 width)
Definition: image_info.hpp:72
png::def_image_info_holder
The default image_info holder class. Stores image_info member object.
Definition: streaming_base.hpp:46
png::make_image_info
image_info make_image_info()
Returns an image_info object with color_type and bit_depth fields setup appropriate for the pixel typ...
Definition: image_info.hpp:204
png::image_info::set_height
void set_height(uint_32 height)
Definition: image_info.hpp:82
png::pixel_traits
Pixel traits class template.
Definition: pixel_traits.hpp:48
png::streaming_base::streaming_base
streaming_base(image_info &info)
Definition: streaming_base.hpp:95
png::streaming_base::get_info
image_info const & get_info() const
Definition: streaming_base.hpp:107
png::streaming_base::get_info
image_info & get_info()
Definition: streaming_base.hpp:118
png::streaming_base::streaming_base
streaming_base(uint_32 width, uint_32 height)
Definition: streaming_base.hpp:100
png::streaming_base::traits
pixel_traits< pixel > traits
Definition: streaming_base.hpp:93
image_info.hpp
png::streaming_base::m_info_holder
info_holder m_info_holder
Definition: streaming_base.hpp:123
png
Definition: color.hpp:37