54 lines
1.8 KiB
C
Vendored
54 lines
1.8 KiB
C
Vendored
#define STB_TRUETYPE_IMPLEMENTATION
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#include "stb_truetype.h"
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unsigned char* stbtt_RenderText(stbtt_fontinfo* info, int b_w, int b_h, int l_h, int* word)
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{
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// https://github.com/justinmeiners/stb-truetype-example
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/* create a bitmap for the phrase */
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unsigned char* bitmap = calloc(b_w * b_h, sizeof(unsigned char));
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/* calculate font scaling */
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float scale = stbtt_ScaleForPixelHeight(info, l_h);
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int x = 0;
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int ascent, descent, lineGap;
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stbtt_GetFontVMetrics(info, &ascent, &descent, &lineGap);
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ascent = roundf(ascent * scale);
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descent = roundf(descent * scale);
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int i = 0;
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while (word[i]) {
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/* how wide is this character */
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int ax;
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int lsb;
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stbtt_GetCodepointHMetrics(info, word[i], &ax, &lsb);
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/* (Note that each Codepoint call has an alternative Glyph version which caches the work required to lookup the character word[i].) */
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/* get bounding box for character (may be offset to account for chars that dip above or below the line) */
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int c_x1, c_y1, c_x2, c_y2;
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stbtt_GetCodepointBitmapBox(info, word[i], scale, scale, &c_x1, &c_y1, &c_x2, &c_y2);
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/* compute y (different characters have different heights) */
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int y = ascent + c_y1;
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/* render character (stride and offset is important here) */
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int byteOffset = x + roundf(lsb * scale) + (y * b_w);
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stbtt_MakeCodepointBitmap(info, bitmap + byteOffset, c_x2 - c_x1, c_y2 - c_y1, b_w, scale, scale, word[i]);
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/* advance x */
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x += roundf(ax * scale);
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/* add kerning */
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int kern;
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kern = stbtt_GetCodepointKernAdvance(info, word[i], word[i + 1]);
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x += roundf(kern * scale);
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++i;
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}
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return bitmap;
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}
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int main() { return 0; }
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