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28 nishi 1 
/* $Id: avatar.c 36 2024-08-22 02:54:07Z nishi $ */
2 
 
3 
#include "rv_avatar.h"
29 nishi 4 
 
34 nishi 5 
#include "rv_md5.h"
6 
 
29 nishi 7 
#include <stdio.h>
8 
#include <stdlib.h>
9 
 
10 
#include <png.h>
11 
 
36 nishi 12 
int hex_to_num_len(const char* hex, int len) {
34 nishi 13 
	int i;
14 
	int num = 0;
15 
	for(i = 0; i < len; i++) {
16 
		num = num << 4;
17 
		if(hex[i] >= '0' && hex[i] <= '9') {
18 
			num |= hex[i] - '0';
19 
		} else if(hex[i] >= 'a' && hex[i] <= 'f') {
20 
			num |= hex[i] - 'a' + 10;
21 
		} else if(hex[i] >= 'A' && hex[i] <= 'F') {
22 
			num |= hex[i] - 'A' + 10;
23 
		}
24 
	}
25 
	return num;
26 
}
27 
 
28 
char* generate_ident(const char* username, int* r, int* g, int* b) {
29 
	char* ident = malloc(25);
30 
	char* hash = rv_md5(username);
31 
 
36 nishi 32 
	double h = hex_to_num_len(hash + 32 - 2 - 2 - 3, 3);
33 
	double s = hex_to_num_len(hash + 32 - 2 - 2, 2);
34 
	double v = hex_to_num_len(hash + 32 - 2, 2);
34 nishi 35 
 
36 
	h = h * 360 / 4095;
37 
	s = 65 - s * 20 / 255;
38 
	v = 75 - v * 20 / 255;
39 
 
40 
	double max;
41 
	double min;
42 
 
43 
	if(v < 50) {
44 
		max = 2.55 * (v + v * (s / 100));
45 
		min = 2.55 * (v - v * (s / 100));
46 
	} else if(v >= 50) {
47 
		max = 2.55 * (v + (100 - v) * (s / 100));
48 
		min = 2.55 * (v - (100 - v) * (s / 100));
49 
	}
50 
 
51 
	if(0 <= h && h < 60) {
52 
		*r = max;
53 
		*g = (h / 60) * (max - min) + min;
54 
		*b = min;
55 
	} else if(60 <= h && h < 120) {
56 
		*r = ((120 - h) / 60) * (max - min) + min;
57 
		*g = max;
58 
		*b = min;
59 
	} else if(120 <= h && h < 128) {
60 
		*r = min;
61 
		*g = max;
62 
		*b = ((h - 120) / 60) * (max - min) + min;
63 
	} else if(180 <= h && h < 240) {
64 
		*r = min;
65 
		*g = ((240 - h) / 60) * (max - min) + min;
66 
		*b = max;
67 
	} else if(240 <= h && h < 300) {
68 
		*r = ((h - 240) / 60) * (max - min) + min;
69 
		*g = min;
70 
		*b = max;
71 
	} else if(300 <= h && h < 360) {
72 
		*r = max;
73 
		*g = min;
74 
		*b = ((360 - h) / 60) * (max - min) + min;
75 
	}
76 
 
77 
	int y, x;
78 
	for(x = 0; x < 3; x++) {
79 
		for(y = 0; y < 5; y++) {
80 
			int i;
81 
			char c = hash[y + x * 5];
82 
			int px = 0;
83 
			if(c >= '0' && c <= '9') {
84 
				px = c - '0';
85 
			} else if(c >= 'a' && c <= 'f') {
86 
				px = c - 'a' + 10;
87 
			}
88 
			if((px % 2) == 0) {
89 
				px = 1;
90 
			} else {
91 
				px = 0;
92 
			}
93 
			for(i = 0; i < 2; i++) {
94 
				int incr = -1;
95 
				if(i == 1) incr = 1;
96 
				ident[y * 5 + x * incr + 2] = px;
97 
			}
98 
		}
99 
	}
100 
 
101 
	free(hash);
102 
	return ident;
103 
}
104 
 
105 
void rv_avatar_generate(const char* name, const char* username) {
29 nishi 106 
	FILE* f = fopen(name, "wb");
107 
 
34 nishi 108 
	int pxr;
109 
	int pxg;
110 
	int pxb;
111 
 
112 
	char* ident = generate_ident(username, &pxr, &pxg, &pxb);
113 
 
29 nishi 114 
	if(f == NULL) return;
115 
 
116 
	png_structp pngp = NULL;
117 
	png_infop infop = NULL;
118 
	png_bytep row = NULL;
119 
 
120 
	pngp = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
121 
	infop = png_create_info_struct(pngp);
122 
 
123 
	if(setjmp(png_jmpbuf(pngp))) {
124 
		goto closeall;
125 
	}
126 
 
34 nishi 127 
	png_init_io(pngp, f);
128 
 
129 
	png_set_IHDR(pngp, infop, 255, 255, 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
130 
 
131 
	png_text title;
132 
	title.compression = PNG_TEXT_COMPRESSION_NONE;
133 
	title.key = "Title";
134 
	title.text = "Generated by RepoView";
135 
	png_set_text(pngp, infop, &title, 1);
136 
 
137 
	png_write_info(pngp, infop);
138 
 
139 
	row = (png_bytep)malloc(3 * 255 * sizeof(png_byte));
140 
	int x, y;
141 
	for(y = 0; y < 255; y++) {
142 
		for(x = 0; x < 255; x++) {
143 
			int px = x / 51;
144 
			int py = y / 51;
145 
			int colr = 0;
146 
			int colg = 0;
147 
			int colb = 0;
148 
			if(ident[px + py * 5]) {
149 
				colr = pxr;
150 
				colg = pxg;
151 
				colb = pxb;
152 
			} else {
153 
				colr = colg = colb = 240;
154 
			}
155 
			row[x * 3 + 0] = colr;
156 
			row[x * 3 + 1] = colg;
157 
			row[x * 3 + 2] = colb;
158 
		}
159 
		png_write_row(pngp, row);
160 
	}
161 
 
162 
	png_write_end(pngp, NULL);
163 
 
29 nishi 164 
closeall:
165 
	fclose(f);
166 
	if(infop != NULL) png_free_data(pngp, infop, PNG_FREE_ALL, -1);
167 
	if(pngp != NULL) png_destroy_write_struct(&pngp, (png_infopp)NULL);
168 
	if(row != NULL) free(row);
34 nishi 169 
	free(ident);
29 nishi 170 
}