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Diffstat (limited to 'thirdparty/stb/stb_easy_font.h')
| -rw-r--r-- | thirdparty/stb/stb_easy_font.h | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/thirdparty/stb/stb_easy_font.h b/thirdparty/stb/stb_easy_font.h new file mode 100644 index 0000000..afe4013 --- /dev/null +++ b/thirdparty/stb/stb_easy_font.h @@ -0,0 +1,303 @@ +// stb_easy_font.h - v1.0 - bitmap font for 3D rendering - public domain +// Sean Barrett, Feb 2015 +// +// Easy-to-deploy, +// reasonably compact, +// extremely inefficient performance-wise, +// crappy-looking, +// ASCII-only, +// bitmap font for use in 3D APIs. +// +// Intended for when you just want to get some text displaying +// in a 3D app as quickly as possible. +// +// Doesn't use any textures, instead builds characters out of quads. +// +// DOCUMENTATION: +// +// int stb_easy_font_width(char *text) +// int stb_easy_font_height(char *text) +// +// Takes a string and returns the horizontal size and the +// vertical size (which can vary if 'text' has newlines). +// +// int stb_easy_font_print(float x, float y, +// char *text, unsigned char color[4], +// void *vertex_buffer, int vbuf_size) +// +// Takes a string (which can contain '\n') and fills out a +// vertex buffer with renderable data to draw the string. +// Output data assumes increasing x is rightwards, increasing y +// is downwards. +// +// The vertex data is divided into quads, i.e. there are four +// vertices in the vertex buffer for each quad. +// +// The vertices are stored in an interleaved format: +// +// x:float +// y:float +// z:float +// color:uint8[4] +// +// You can ignore z and color if you get them from elsewhere +// This format was chosen in the hopes it would make it +// easier for you to reuse existing vertex-buffer-drawing code. +// +// If you pass in NULL for color, it becomes 255,255,255,255. +// +// Returns the number of quads. +// +// If the buffer isn't large enough, it will truncate. +// Expect it to use an average of ~270 bytes per character. +// +// If your API doesn't draw quads, build a reusable index +// list that allows you to render quads as indexed triangles. +// +// void stb_easy_font_spacing(float spacing) +// +// Use positive values to expand the space between characters, +// and small negative values (no smaller than -1.5) to contract +// the space between characters. +// +// E.g. spacing = 1 adds one "pixel" of spacing between the +// characters. spacing = -1 is reasonable but feels a bit too +// compact to me; -0.5 is a reasonable compromise as long as +// you're scaling the font up. +// +// LICENSE +// +// See end of file for license information. +// +// VERSION HISTORY +// +// (2017-01-15) 1.0 space character takes same space as numbers; fix bad spacing of 'f' +// (2016-01-22) 0.7 width() supports multiline text; add height() +// (2015-09-13) 0.6 #include <math.h>; updated license +// (2015-02-01) 0.5 First release +// +// CONTRIBUTORS +// +// github:vassvik -- bug report + +#if 0 +// SAMPLE CODE: +// +// Here's sample code for old OpenGL; it's a lot more complicated +// to make work on modern APIs, and that's your problem. +// +void print_string(float x, float y, char *text, float r, float g, float b) +{ + static char buffer[99999]; // ~500 chars + int num_quads; + + num_quads = stb_easy_font_print(x, y, text, NULL, buffer, sizeof(buffer)); + + glColor3f(r,g,b); + glEnableClientState(GL_VERTEX_ARRAY); + glVertexPointer(2, GL_FLOAT, 16, buffer); + glDrawArrays(GL_QUADS, 0, num_quads*4); + glDisableClientState(GL_VERTEX_ARRAY); +} +#endif + +#ifndef INCLUDE_STB_EASY_FONT_H +#define INCLUDE_STB_EASY_FONT_H + +#include <stdlib.h> +#include <math.h> + +struct stb_easy_font_info_struct { + unsigned char advance; + unsigned char h_seg; + unsigned char v_seg; +} stb_easy_font_charinfo[96] = { + { 6, 0, 0 }, { 3, 0, 0 }, { 5, 1, 1 }, { 7, 1, 4 }, + { 7, 3, 7 }, { 7, 6, 12 }, { 7, 8, 19 }, { 4, 16, 21 }, + { 4, 17, 22 }, { 4, 19, 23 }, { 23, 21, 24 }, { 23, 22, 31 }, + { 20, 23, 34 }, { 22, 23, 36 }, { 19, 24, 36 }, { 21, 25, 36 }, + { 6, 25, 39 }, { 6, 27, 43 }, { 6, 28, 45 }, { 6, 30, 49 }, + { 6, 33, 53 }, { 6, 34, 57 }, { 6, 40, 58 }, { 6, 46, 59 }, + { 6, 47, 62 }, { 6, 55, 64 }, { 19, 57, 68 }, { 20, 59, 68 }, + { 21, 61, 69 }, { 22, 66, 69 }, { 21, 68, 69 }, { 7, 73, 69 }, + { 9, 75, 74 }, { 6, 78, 81 }, { 6, 80, 85 }, { 6, 83, 90 }, + { 6, 85, 91 }, { 6, 87, 95 }, { 6, 90, 96 }, { 7, 92, 97 }, + { 6, 96,102 }, { 5, 97,106 }, { 6, 99,107 }, { 6,100,110 }, + { 6,100,115 }, { 7,101,116 }, { 6,101,121 }, { 6,101,125 }, + { 6,102,129 }, { 7,103,133 }, { 6,104,140 }, { 6,105,145 }, + { 7,107,149 }, { 6,108,151 }, { 7,109,155 }, { 7,109,160 }, + { 7,109,165 }, { 7,118,167 }, { 6,118,172 }, { 4,120,176 }, + { 6,122,177 }, { 4,122,181 }, { 23,124,182 }, { 22,129,182 }, + { 4,130,182 }, { 22,131,183 }, { 6,133,187 }, { 22,135,191 }, + { 6,137,192 }, { 22,139,196 }, { 6,144,197 }, { 22,147,198 }, + { 6,150,202 }, { 19,151,206 }, { 21,152,207 }, { 6,155,209 }, + { 3,160,210 }, { 23,160,211 }, { 22,164,216 }, { 22,165,220 }, + { 22,167,224 }, { 22,169,228 }, { 21,171,232 }, { 21,173,233 }, + { 5,178,233 }, { 22,179,234 }, { 23,180,238 }, { 23,180,243 }, + { 23,180,248 }, { 22,189,248 }, { 22,191,252 }, { 5,196,252 }, + { 3,203,252 }, { 5,203,253 }, { 22,210,253 }, { 0,214,253 }, +}; + +unsigned char stb_easy_font_hseg[214] = { + 97,37,69,84,28,51,2,18,10,49,98,41,65,25,81,105,33,9,97,1,97,37,37,36, + 81,10,98,107,3,100,3,99,58,51,4,99,58,8,73,81,10,50,98,8,73,81,4,10,50, + 98,8,25,33,65,81,10,50,17,65,97,25,33,25,49,9,65,20,68,1,65,25,49,41, + 11,105,13,101,76,10,50,10,50,98,11,99,10,98,11,50,99,11,50,11,99,8,57, + 58,3,99,99,107,10,10,11,10,99,11,5,100,41,65,57,41,65,9,17,81,97,3,107, + 9,97,1,97,33,25,9,25,41,100,41,26,82,42,98,27,83,42,98,26,51,82,8,41, + 35,8,10,26,82,114,42,1,114,8,9,73,57,81,41,97,18,8,8,25,26,26,82,26,82, + 26,82,41,25,33,82,26,49,73,35,90,17,81,41,65,57,41,65,25,81,90,114,20, + 84,73,57,41,49,25,33,65,81,9,97,1,97,25,33,65,81,57,33,25,41,25, +}; + +unsigned char stb_easy_font_vseg[253] = { + 4,2,8,10,15,8,15,33,8,15,8,73,82,73,57,41,82,10,82,18,66,10,21,29,1,65, + 27,8,27,9,65,8,10,50,97,74,66,42,10,21,57,41,29,25,14,81,73,57,26,8,8, + 26,66,3,8,8,15,19,21,90,58,26,18,66,18,105,89,28,74,17,8,73,57,26,21, + 8,42,41,42,8,28,22,8,8,30,7,8,8,26,66,21,7,8,8,29,7,7,21,8,8,8,59,7,8, + 8,15,29,8,8,14,7,57,43,10,82,7,7,25,42,25,15,7,25,41,15,21,105,105,29, + 7,57,57,26,21,105,73,97,89,28,97,7,57,58,26,82,18,57,57,74,8,30,6,8,8, + 14,3,58,90,58,11,7,74,43,74,15,2,82,2,42,75,42,10,67,57,41,10,7,2,42, + 74,106,15,2,35,8,8,29,7,8,8,59,35,51,8,8,15,35,30,35,8,8,30,7,8,8,60, + 36,8,45,7,7,36,8,43,8,44,21,8,8,44,35,8,8,43,23,8,8,43,35,8,8,31,21,15, + 20,8,8,28,18,58,89,58,26,21,89,73,89,29,20,8,8,30,7, +}; + +typedef struct +{ + unsigned char c[4]; +} stb_easy_font_color; + +static int stb_easy_font_draw_segs(float x, float y, unsigned char *segs, int num_segs, int vertical, stb_easy_font_color c, char *vbuf, int vbuf_size, int offset) +{ + int i,j; + for (i=0; i < num_segs; ++i) { + int len = segs[i] & 7; + x += (float) ((segs[i] >> 3) & 1); + if (len && offset+64 <= vbuf_size) { + float y0 = y + (float) (segs[i]>>4); + for (j=0; j < 4; ++j) { + * (float *) (vbuf+offset+0) = x + (j==1 || j==2 ? (vertical ? 1 : len) : 0); + * (float *) (vbuf+offset+4) = y0 + ( j >= 2 ? (vertical ? len : 1) : 0); + * (float *) (vbuf+offset+8) = 0.f; + * (stb_easy_font_color *) (vbuf+offset+12) = c; + offset += 16; + } + } + } + return offset; +} + +float stb_easy_font_spacing_val = 0; +static void stb_easy_font_spacing(float spacing) +{ + stb_easy_font_spacing_val = spacing; +} + +static int stb_easy_font_print(float x, float y, char *text, unsigned char color[4], void *vertex_buffer, int vbuf_size) +{ + char *vbuf = (char *) vertex_buffer; + float start_x = x; + int offset = 0; + + stb_easy_font_color c = { 255,255,255,255 }; // use structure copying to avoid needing depending on memcpy() + if (color) { c.c[0] = color[0]; c.c[1] = color[1]; c.c[2] = color[2]; c.c[3] = color[3]; } + + while (*text && offset < vbuf_size) { + if (*text == '\n') { + y += 12; + x = start_x; + } else { + unsigned char advance = stb_easy_font_charinfo[*text-32].advance; + float y_ch = advance & 16 ? y+1 : y; + int h_seg, v_seg, num_h, num_v; + h_seg = stb_easy_font_charinfo[*text-32 ].h_seg; + v_seg = stb_easy_font_charinfo[*text-32 ].v_seg; + num_h = stb_easy_font_charinfo[*text-32+1].h_seg - h_seg; + num_v = stb_easy_font_charinfo[*text-32+1].v_seg - v_seg; + offset = stb_easy_font_draw_segs(x, y_ch, &stb_easy_font_hseg[h_seg], num_h, 0, c, vbuf, vbuf_size, offset); + offset = stb_easy_font_draw_segs(x, y_ch, &stb_easy_font_vseg[v_seg], num_v, 1, c, vbuf, vbuf_size, offset); + x += advance & 15; + x += stb_easy_font_spacing_val; + } + ++text; + } + return (unsigned) offset/64; +} + +static int stb_easy_font_width(char *text) +{ + float len = 0; + float max_len = 0; + while (*text) { + if (*text == '\n') { + if (len > max_len) max_len = len; + len = 0; + } else { + len += stb_easy_font_charinfo[*text-32].advance & 15; + len += stb_easy_font_spacing_val; + } + ++text; + } + if (len > max_len) max_len = len; + return (int) ceil(max_len); +} + +static int stb_easy_font_height(char *text) +{ + float y = 0; + int nonempty_line=0; + while (*text) { + if (*text == '\n') { + y += 12; + nonempty_line = 0; + } else { + nonempty_line = 1; + } + ++text; + } + return (int) ceil(y + (nonempty_line ? 12 : 0)); +} +#endif + +/* +------------------------------------------------------------------------------ +This software is available under 2 licenses -- choose whichever you prefer. +------------------------------------------------------------------------------ +ALTERNATIVE A - MIT License +Copyright (c) 2017 Sean Barrett +Permission is hereby granted, free of charge, to any person obtaining a copy of +this software and associated documentation files (the "Software"), to deal in +the Software without restriction, including without limitation the rights to +use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies +of the Software, and to permit persons to whom the Software is furnished to do +so, subject to the following conditions: +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. +------------------------------------------------------------------------------ +ALTERNATIVE B - Public Domain (www.unlicense.org) +This is free and unencumbered software released into the public domain. +Anyone is free to copy, modify, publish, use, compile, sell, or distribute this +software, either in source code form or as a compiled binary, for any purpose, +commercial or non-commercial, and by any means. +In jurisdictions that recognize copyright laws, the author or authors of this +software dedicate any and all copyright interest in the software to the public +domain. We make this dedication for the benefit of the public at large and to +the detriment of our heirs and successors. We intend this dedication to be an +overt act of relinquishment in perpetuity of all present and future rights to +this software under copyright law. +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN +ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +------------------------------------------------------------------------------ +*/ |