├── vc14
    ├── .gitignore
    ├── pngcmp.vcxproj.filters
    ├── pngcmp.sln
    └── pngcmp.vcxproj
├── README.org
├── LICENSE.txt
└── main.cpp


/vc14/.gitignore:
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1 | Debug
2 | Release
3 | .vs
4 | *.VC.db
5 | *.VC.VC.opendb
6 | *.vcxproj.user
7 | 


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/README.org:
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1 | * pngcmp
2 | 
3 | Pngcmp compares two .png files and outputs the number of matching pixels and total number of pixels.
4 | 
5 | #+BEGIN_SRC sh
6 | pngcmp a.png b.png
7 | # => 303916	307200
8 | #+END_SRC
9 | 


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/vc14/pngcmp.vcxproj.filters:
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 1 | <?xml version="1.0" encoding="utf-8"?>
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/LICENSE.txt:
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 1 | The MIT License (MIT)
 2 | 
 3 | Copyright (c) 2017 AKIYAMA Kouhei
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


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/vc14/pngcmp.sln:
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 1 | 
 2 | Microsoft Visual Studio Solution File, Format Version 12.00
 3 | # Visual Studio 14
 4 | VisualStudioVersion = 14.0.25123.0
 5 | MinimumVisualStudioVersion = 10.0.40219.1
 6 | Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "pngcmp", "pngcmp.vcxproj", "{377ECAED-6A48-4FF8-B39B-772B33EE7C82}"
 7 | EndProject
 8 | Global
 9 | 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
10 | 		Debug|x64 = Debug|x64
11 | 		Debug|x86 = Debug|x86
12 | 		Release|x64 = Release|x64
13 | 		Release|x86 = Release|x86
14 | 	EndGlobalSection
15 | 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
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17 | 		{377ECAED-6A48-4FF8-B39B-772B33EE7C82}.Debug|x64.Build.0 = Debug|x64
18 | 		{377ECAED-6A48-4FF8-B39B-772B33EE7C82}.Debug|x86.ActiveCfg = Debug|Win32
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21 | 		{377ECAED-6A48-4FF8-B39B-772B33EE7C82}.Release|x64.Build.0 = Release|x64
22 | 		{377ECAED-6A48-4FF8-B39B-772B33EE7C82}.Release|x86.ActiveCfg = Release|Win32
23 | 		{377ECAED-6A48-4FF8-B39B-772B33EE7C82}.Release|x86.Build.0 = Release|Win32
24 | 	EndGlobalSection
25 | 	GlobalSection(SolutionProperties) = preSolution
26 | 		HideSolutionNode = FALSE
27 | 	EndGlobalSection
28 | EndGlobal
29 | 


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/main.cpp:
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  1 | /**
  2 |  * pngcmp main
  3 |  *
  4 |  * @author AKIYAMA Kouhei
  5 |  * @since 2017-02-02
  6 |  */
  7 | 
  8 | #ifndef PNGCMP_LINK_STATIC_LIBRARY
  9 | # define PNGCMP_LINK_STATIC_LIBRARY 1
 10 | #endif
 11 | #if PNGCMP_LINK_STATIC_LIBRARY
 12 | # ifdef _DEBUG
 13 | #  pragma comment(lib, "Debug Library/libpng16.lib")
 14 | #  pragma comment(lib, "ZlibStatDebug/zlibstat.lib")
 15 | # else
 16 | #  pragma comment(lib, "Release Library/libpng16.lib")
 17 | #  pragma comment(lib, "ZlibStatRelease/zlibstat.lib")
 18 | # endif
 19 | #endif
 20 | 
 21 | #include <iostream>
 22 | #include <string>
 23 | #include <cstdio>
 24 | #include <setjmp.h>
 25 | #include <png.h>
 26 | 
 27 | struct PngStruct
 28 | {
 29 |     png_structp png_ptr;
 30 |     png_infop info_ptr;
 31 |     png_infop end_info;
 32 |     PngStruct()
 33 |         : png_ptr(png_create_read_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr))
 34 |         , info_ptr(png_ptr ? png_create_info_struct(png_ptr) : nullptr)
 35 |         , end_info(png_ptr ? png_create_info_struct(png_ptr) : nullptr)
 36 |     {
 37 |     }
 38 |     ~PngStruct()
 39 |     {
 40 |         if(png_ptr){
 41 |             png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
 42 |         }
 43 |     }
 44 |     bool hasError() const
 45 |     {
 46 |         return !png_ptr || !info_ptr || !end_info;
 47 |     }
 48 | };
 49 | 
 50 | struct File
 51 | {
 52 |     FILE *fp;
 53 |     File(const char *filename) : fp(std::fopen(filename, "rb")){}
 54 |     ~File(){if(fp){std::fclose(fp);}}
 55 |     operator FILE *() const {return fp;}
 56 | };
 57 | 
 58 | class PngFile
 59 | {
 60 |     std::string filename;
 61 |     File fp;
 62 |     PngStruct png;
 63 | public:
 64 |     PngFile(const char * const filename)
 65 |         : filename(filename)
 66 |         , fp(filename)
 67 |         , png()
 68 |     {
 69 |     }
 70 |     void error(const std::string &msg)
 71 |     {
 72 |         std::cerr << filename << ":: " << msg << std::endl;
 73 |     }
 74 |     bool read()
 75 |     {
 76 |         if(!fp){
 77 |             error("File cannot open.");
 78 |             return false;
 79 |         }
 80 |         if(png.hasError()){
 81 |             error("Failed to initialize libpng.");
 82 |             return false;
 83 |         }
 84 | 
 85 |         png_init_io(png.png_ptr, fp);
 86 | 
 87 |         // read image.
 88 |         int transform
 89 |             = PNG_TRANSFORM_STRIP_16
 90 |             | PNG_TRANSFORM_EXPAND
 91 |             | PNG_TRANSFORM_BGR;
 92 | 
 93 |         png_read_png(png.png_ptr, png.info_ptr, transform, NULL);
 94 | 
 95 |         const int color_type = png_get_color_type(png.png_ptr, png.info_ptr);
 96 |         const int bit_depth = png_get_bit_depth(png.png_ptr, png.info_ptr);
 97 | 
 98 |         const std::size_t pixelBytes =
 99 |             color_type == PNG_COLOR_TYPE_RGB ? 3 :
100 |             color_type == PNG_COLOR_TYPE_RGB_ALPHA ? 4 :
101 |             0;
102 |         if (pixelBytes == 0){
103 |             error("unsupported color type found.");
104 |             return false;
105 |         }
106 |         ///@todo 16bit-depth
107 |         ///@todo PNG_COLOR_TYPE_PALETTE
108 |         return true;
109 |     }
110 |     const png_bytep *rows(){return png_get_rows(png.png_ptr, png.info_ptr);}
111 |     png_uint_32 width(){return png_get_image_width(png.png_ptr, png.info_ptr);}
112 |     png_uint_32 height(){return png_get_image_height(png.png_ptr, png.info_ptr);}
113 |     int color_type(){return png_get_color_type(png.png_ptr, png.info_ptr);}
114 | };
115 | 
116 | 
117 | 
118 | int main(int argc, char *argv[])
119 | {
120 |     if(argc < 3){
121 |         std::cout << "usage: " << argv[0] << " <png filename1> <png filename2>" << std::endl;
122 |         return -1;
123 |     }
124 | 
125 | 	// read png
126 |     PngFile img1(argv[1]);
127 |     if(!img1.read()){return -1;}
128 |     PngFile img2(argv[2]);
129 |     if(!img2.read()){return -1;}
130 | 
131 | 	// compare width, height, color_type
132 |     if(img1.width() != img2.width() || img1.height() != img2.height()){
133 |         std::cerr << "Image size mismatch." << std::endl;
134 |         return -1;
135 |     }
136 |     if(img1.color_type() != img2.color_type()){
137 |         std::cerr << "Image color type mismatch." << std::endl;
138 |         return -1;
139 |     }
140 | 
141 | 	// compare pixels
142 |     const unsigned int width = img1.width();
143 |     const unsigned int height = img1.height();
144 |     const int color_type = img1.color_type();
145 |     const png_bytep * const rows1 = img1.rows();
146 |     const png_bytep * const rows2 = img2.rows();
147 | 
148 |     int error_count = 0;
149 |     for(unsigned int y = 0; y < height; ++y){
150 |         png_bytep p1 = rows1[y];
151 |         png_bytep p2 = rows2[y];
152 | 
153 |         if(color_type == PNG_COLOR_TYPE_RGB){
154 |             for(unsigned int x = 0; x < width; ++x){
155 |                 if(p1[0] != p2[0] ||
156 |                    p1[1] != p2[1] ||
157 |                    p1[2] != p2[2]){
158 |                     ++error_count;
159 |                 }
160 |                 p1 += 3;
161 |                 p2 += 3;
162 |             }
163 |         }
164 |         else if(color_type == PNG_COLOR_TYPE_RGB_ALPHA){
165 |             for(unsigned int x = 0; x < width; ++x){
166 |                 if(p1[0] != p2[0] ||
167 |                    p1[1] != p2[1] ||
168 |                    p1[2] != p2[2] ||
169 |                    p1[3] != p2[3]){
170 |                     ++error_count;
171 |                 }
172 |                 p1 += 4;
173 |                 p2 += 4;
174 |             }
175 |         }
176 |         else{
177 |             return -1;
178 |         }
179 |     }
180 | 
181 | 	// output result
182 |     const unsigned int total = width * height;
183 |     const unsigned int matched = total - error_count;
184 |     std::cout << matched << "\t" << total << std::endl;
185 |     //std::cout << (100 * matched / total) << std::endl;
186 | 
187 |     return 0;
188 | }
189 | 


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/vc14/pngcmp.vcxproj:
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