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