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Rev 29 Rev 34
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/* $Id: avatar.c 29 2024-08-21 19:23:54Z nishi $ */
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/* $Id: avatar.c 34 2024-08-22 02:50:46Z nishi $ */
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#include "rv_avatar.h"
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#include "rv_avatar.h"
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 4 
 
- 
 
 5 
#include "rv_md5.h"
- 
 
 6 
 
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#include <stdio.h>
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#include <stdio.h>
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#include <stdlib.h>
 8 
#include <stdlib.h>
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 9 
 
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#include <png.h>
 10 
#include <png.h>
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 11 
 
- 
 
 12 
int hex_to_num(const char* hex, int len) {
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	int i;
- 
 
 14 
	int num = 0;
- 
 
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	for(i = 0; i < len; i++) {
- 
 
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		num = num << 4;
- 
 
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		if(hex[i] >= '0' && hex[i] <= '9') {
- 
 
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			num |= hex[i] - '0';
- 
 
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		} else if(hex[i] >= 'a' && hex[i] <= 'f') {
- 
 
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			num |= hex[i] - 'a' + 10;
- 
 
 21 
		} else if(hex[i] >= 'A' && hex[i] <= 'F') {
- 
 
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			num |= hex[i] - 'A' + 10;
- 
 
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		}
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	}
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	return num;
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}
- 
 
 27 
 
- 
 
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char* generate_ident(const char* username, int* r, int* g, int* b) {
- 
 
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	char* ident = malloc(25);
- 
 
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	char* hash = rv_md5(username);
- 
 
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- 
 
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	double h = hex_to_num(hash + 32 - 2 - 2 - 3, 3);
- 
 
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	double s = hex_to_num(hash + 32 - 2 - 2, 2);
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	double v = hex_to_num(hash + 32 - 2, 2);
- 
 
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	h = h * 360 / 4095;
- 
 
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	s = 65 - s * 20 / 255;
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	v = 75 - v * 20 / 255;
- 
 
 39 
 
- 
 
 40 
	double max;
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	double min;
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 42 
 
- 
 
 43 
	if(v < 50) {
- 
 
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		max = 2.55 * (v + v * (s / 100));
- 
 
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		min = 2.55 * (v - v * (s / 100));
- 
 
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	} else if(v >= 50) {
- 
 
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		max = 2.55 * (v + (100 - v) * (s / 100));
- 
 
 48 
		min = 2.55 * (v - (100 - v) * (s / 100));
- 
 
 49 
	}
- 
 
 50 
 
- 
 
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	if(0 <= h && h < 60) {
- 
 
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		*r = max;
- 
 
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		*g = (h / 60) * (max - min) + min;
- 
 
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		*b = min;
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 55 
	} else if(60 <= h && h < 120) {
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		*r = ((120 - h) / 60) * (max - min) + min;
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		*g = max;
- 
 
 58 
		*b = min;
- 
 
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	} else if(120 <= h && h < 128) {
- 
 
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		*r = min;
- 
 
 61 
		*g = max;
- 
 
 62 
		*b = ((h - 120) / 60) * (max - min) + min;
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	} else if(180 <= h && h < 240) {
- 
 
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		*r = min;
- 
 
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		*g = ((240 - h) / 60) * (max - min) + min;
- 
 
 66 
		*b = max;
- 
 
 67 
	} else if(240 <= h && h < 300) {
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		*r = ((h - 240) / 60) * (max - min) + min;
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		*g = min;
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		*b = max;
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	} else if(300 <= h && h < 360) {
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		*r = max;
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		*g = min;
- 
 
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		*b = ((360 - h) / 60) * (max - min) + min;
- 
 
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	}
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 76 
 
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	int y, x;
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	for(x = 0; x < 3; x++) {
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		for(y = 0; y < 5; y++) {
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 80 
			int i;
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			char c = hash[y + x * 5];
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			int px = 0;
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			if(c >= '0' && c <= '9') {
- 
 
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				px = c - '0';
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 85 
			} else if(c >= 'a' && c <= 'f') {
- 
 
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				px = c - 'a' + 10;
- 
 
 87 
			}
- 
 
 88 
			if((px % 2) == 0) {
- 
 
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				px = 1;
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 90 
			} else {
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 91 
				px = 0;
- 
 
 92 
			}
- 
 
 93 
			for(i = 0; i < 2; i++) {
- 
 
 94 
				int incr = -1;
- 
 
 95 
				if(i == 1) incr = 1;
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				ident[y * 5 + x * incr + 2] = px;
- 
 
 97 
			}
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 98 
		}
- 
 
 99 
	}
- 
 
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	free(hash);
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	return ident;
- 
 
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}
- 
 
 104 
 
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void rv_avatar_generate(const char* name) {
 105 
void rv_avatar_generate(const char* name, const char* username) {
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	FILE* f = fopen(name, "wb");
 106 
	FILE* f = fopen(name, "wb");
12 
 
 107 
 
- 
 
 108 
	int pxr;
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 109 
	int pxg;
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 110 
	int pxb;
- 
 
 111 
 
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	char* ident = generate_ident(username, &pxr, &pxg, &pxb);
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 113 
 
13 
	if(f == NULL) return;
 114 
	if(f == NULL) return;
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 115 
 
15 
	png_structp pngp = NULL;
 116 
	png_structp pngp = NULL;
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	png_infop infop = NULL;
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	png_infop infop = NULL;
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	png_bytep row = NULL;
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	png_bytep row = NULL;
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 122 
 
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	if(setjmp(png_jmpbuf(pngp))) {
 123 
	if(setjmp(png_jmpbuf(pngp))) {
23 
		goto closeall;
 124 
		goto closeall;
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	}
 125 
	}
25 
 
 126 
 
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 127 
	png_init_io(pngp, f);
- 
 
 128 
 
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 129 
	png_set_IHDR(pngp, infop, 255, 255, 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
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 130 
 
- 
 
 131 
	png_text title;
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 132 
	title.compression = PNG_TEXT_COMPRESSION_NONE;
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 133 
	title.key = "Title";
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	title.text = "Generated by RepoView";
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	png_set_text(pngp, infop, &title, 1);
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 136 
 
- 
 
 137 
	png_write_info(pngp, infop);
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 138 
 
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	row = (png_bytep)malloc(3 * 255 * sizeof(png_byte));
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 140 
	int x, y;
- 
 
 141 
	for(y = 0; y < 255; y++) {
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 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 
 
26 
closeall:
 164 
closeall:
27 
	fclose(f);
 165 
	fclose(f);
28 
	if(infop != NULL) png_free_data(pngp, infop, PNG_FREE_ALL, -1);
 166 
	if(infop != NULL) png_free_data(pngp, infop, PNG_FREE_ALL, -1);
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	if(pngp != NULL) png_destroy_write_struct(&pngp, (png_infopp)NULL);
 167 
	if(pngp != NULL) png_destroy_write_struct(&pngp, (png_infopp)NULL);
30 
	if(row != NULL) free(row);
 168 
	if(row != NULL) free(row);
- 
 
 169 
	free(ident);
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}
 170 
}