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fix font

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This commit is contained in:
John Alanbrook
2025-11-06 15:02:03 -06:00
parent c02b42f710
commit 0dd4ad8046
3 changed files with 95 additions and 126 deletions
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216
source/font.c
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@@ -14,6 +14,9 @@
#include "HandmadeMath.h"
typedef struct { const char *start, *end; float width; } line_t;
typedef struct { line_t *lines; float max_width; } layout_lines;
struct sFont *use_font;
void font_free(JSRuntime *rt, font *f)
@@ -75,9 +78,9 @@ struct sFont *MakeFont(void *ttf_buffer, size_t len, int height) {
rect quad;
quad.x = glyph.xoff;
quad.w = glyph.xoff2-glyph.xoff;
quad.y = -glyph.yoff2;
quad.h = glyph.yoff2-glyph.yoff;
quad.y = -glyph.yoff2; // Top of glyph relative to baseline
quad.w = glyph.xoff2 - glyph.xoff;
quad.h = glyph.yoff2 - glyph.yoff; // Height from baseline
newfont->Characters[c].quad = quad;
newfont->Characters[c].advance = glyph.xadvance;
}
@@ -87,6 +90,82 @@ struct sFont *MakeFont(void *ttf_buffer, size_t len, int height) {
return newfont;
}
layout_lines layout_text_lines(const char *text, font *f,
float letter_spacing,
float wrap,
TEXT_BREAK break_at)
{
layout_lines out = {0};
int break_at_word = (break_at == WORD);
const char *line_start = text;
const char *word_start = text;
float line_width = 0;
float word_width = 0;
float max_width = 0;
for (const char *p = text; *p; p++) {
if (*p == '\n') {
line_t L = { line_start, p, line_width };
arrput(out.lines, L);
if (line_width > max_width) max_width = line_width;
line_start = p + 1;
word_start = p + 1;
line_width = 0;
word_width = 0;
continue;
}
unsigned char ch = (unsigned char)*p;
float char_w = f->Characters[ch].advance + letter_spacing;
if (wrap > 0 && line_width + char_w > wrap) {
const char *break_pt = p;
float break_w = line_width;
if (break_at_word && *p != ' ' && word_width > 0 && word_start > line_start) {
break_pt = word_start;
break_w = line_width - word_width;
}
line_t L = { line_start, break_pt, break_w };
arrput(out.lines, L);
if (break_w > max_width) max_width = break_w;
line_start = break_pt;
if (break_at_word && *line_start == ' ') line_start++;
p = line_start - 1;
word_start = line_start;
line_width = 0;
word_width = 0;
continue;
}
line_width += char_w;
if (break_at_word) {
if (*p == ' ') {
word_width = 0;
word_start = p + 1;
} else {
word_width += char_w;
}
}
}
if (line_start < text + strlen(text)) {
line_t L = { line_start, text + strlen(text), line_width };
arrput(out.lines, L);
if (line_width > max_width) max_width = line_width;
}
out.max_width = max_width;
return out;
}
void sdrawCharacter(struct text_vert **buffer, stbtt_packedchar c, HMM_Vec2 cursor, float scale, struct rgba color) {
struct text_vert vert;
@@ -164,69 +243,21 @@ const char *esc_color(const char *c, struct rgba *color, struct rgba defc)
// text is a string, font f, wrap is how long a line is before wrapping. -1 to not wrap
HMM_Vec2 measure_text(const char *text, font *f, float letter_spacing, float wrap, TEXT_BREAK break_at, TEXT_ALIGN align)
{
int break_at_word = (break_at == WORD);
layout_lines lay = layout_text_lines(text, f, letter_spacing, wrap, break_at);
float lh = f->line_height;
float height = lh;
float max_width = 0, line_width = 0;
int line_count = 1; // Start with 1 line
int line_count = arrlen(lay.lines);
float height = line_count > 0 ? line_count * lh : 0;
const char *word_start = text;
float word_width = 0;
for (const char *p = text; *p; ) {
if (*p == '\n') {
if (line_width > max_width) max_width = line_width;
line_width = 0;
height += lh;
line_count++;
word_start = p + 1;
word_width = 0;
p++;
continue;
}
unsigned char ch = (unsigned char)*p;
float adv = f->Characters[ch].advance;
/* add letter spacing unless this will be end-of-line char; unknown yet, so include it here;
wrap logic below uses same width */
float char_w = adv + letter_spacing;
if (wrap > 0 && line_width + char_w > wrap) {
if (break_at_word && *p != ' ' && word_width > 0 && word_width <= wrap) {
line_width -= word_width;
p = word_start;
} else {
if (line_width > max_width) max_width = line_width;
line_width = 0;
height += lh;
line_count++;
word_start = p;
word_width = 0;
/* if not word-breaking or current is space, consume it here */
if (!break_at_word || *p == ' ') { p++; }
continue;
}
} else {
p++;
}
line_width += char_w;
if (break_at_word) {
if (*p == ' ') {
word_width = 0;
word_start = p + 1;
} else {
word_width += char_w;
}
}
float width = lay.max_width;
if (wrap > 0 && align != LEFT && align != JUSTIFY) {
// For RIGHT or CENTER we might shift lines visually, but width is still max(line.width, wrap ? min(wrap, ...) ).
// Usually you'd report max(wrap, width) or just wrap, depending on how you want containers to size.
}
if (line_width > max_width) max_width = line_width;
HMM_Vec2 dim = { width, height };
printf("measure_text: Number of lines: %d\n", line_count);
HMM_Vec2 dim = { max_width, height };
arrfree(lay.lines);
return dim;
}
@@ -236,69 +267,10 @@ struct text_vert *renderText(const char *text, HMM_Vec2 pos, font *f, colorf col
float letter_spacing)
{
text_vert *buffer = NULL;
int break_at_word = (break_at == WORD);
float lh = f->line_height;
typedef struct { const char *start, *end; float width; } line_t;
line_t *lines = NULL;
const char *line_start = text, *word_start = text;
float line_width = 0, word_width = 0;
for (const char *p = text; *p; p++) {
if (*p == '\n') {
line_t L = { line_start, p, line_width };
arrput(lines, L);
line_start = p + 1;
word_start = p + 1;
line_width = 0;
word_width = 0;
continue;
}
unsigned char ch = (unsigned char)*p;
float adv = f->Characters[ch].advance;
float char_w = adv + letter_spacing;
if (wrap > 0 && line_width + char_w > wrap) {
const char *break_pt = p;
float break_w = line_width;
if (break_at_word && *p != ' ' && word_width > 0 && word_start > line_start) {
break_pt = word_start;
break_w = line_width - word_width;
}
line_t L = { line_start, break_pt, break_w };
arrput(lines, L);
line_start = break_pt;
if (break_at_word && *line_start == ' ') line_start++;
p = line_start - 1;
word_start = line_start;
line_width = 0;
word_width = 0;
continue;
}
line_width += char_w;
if (break_at_word) {
if (*p == ' ') {
word_width = 0;
word_start = p + 1;
} else {
word_width += char_w;
}
}
}
if (line_start < text + strlen(text)) {
line_t L = { line_start, text + strlen(text), line_width };
arrput(lines, L);
}
printf("renderText: Number of lines: %d\n", arrlen(lines));
layout_lines lay = layout_text_lines(text, f, letter_spacing, wrap, break_at);
line_t *lines = lay.lines;
HMM_Vec2 cursor = pos;