diff options
| -rw-r--r-- | text.c | 47 | ||||
| -rw-r--r-- | text.h | 4 |
2 files changed, 39 insertions, 12 deletions
@@ -1,6 +1,5 @@ #include "base.h" #include "text.h" -#include "unicode.h" #define STB_TRUETYPE_IMPLEMENTATION #define STBTT_STATIC no_warn_start @@ -9,6 +8,15 @@ no_warn_end #include <stdlib.h> #include <GL/gl.h> +#define UNICODE_BOX_CHARACTER 0x2610 +#define UNICODE_CODE_POINTS 0x110000 // number of Unicode code points + +static bool unicode_is_start_of_code_point(u8 byte) { + // see https://en.wikipedia.org/wiki/UTF-8#Encoding + // continuation bytes are of the form 10xxxxxx + return (byte & 0xC0) != 0x80; +} + // We split up code points into a bunch of pages, so we don't have to load all of the font at // once into one texture. #define CHAR_PAGE_SIZE 2048 @@ -189,12 +197,16 @@ void text_render_char(Font *font, TextRenderState *state, char32_t c) { if (c >= UNICODE_CODE_POINTS) c = UNICODE_BOX_CHARACTER; // code points this big should never appear in valid Unicode uint page = c / CHAR_PAGE_SIZE; uint index = c % CHAR_PAGE_SIZE; - text_render_with_page(font, (int)page); + if (state->render) + text_render_with_page(font, (int)page); stbtt_bakedchar *char_data = font->char_pages[page]; + float char_height = font->char_height; if (char_data) { // if page was successfully loaded stbtt_aligned_quad q = {0}; + state->y += char_height * 0.75f; stbtt_GetBakedQuad(char_data, font->tex_widths[page], font->tex_heights[page], (int)index, &state->x, &state->y, &q, 1); + state->y -= char_height * 0.75f; float s0 = q.s0, t0 = q.t0; float s1 = q.s1, t1 = q.t1; float x0 = q.x0, y0 = q.y0; @@ -223,15 +235,17 @@ void text_render_char(Font *font, TextRenderState *state, char32_t c) { t1 = (max_y-1-y0) / (y1-y0) * (t1-t0) + t0; y1 = max_y-1; } - glTexCoord2f(s0,t0); glVertex2f(x0,y0); - glTexCoord2f(s0,t1); glVertex2f(x0,y1); - glTexCoord2f(s1,t1); glVertex2f(x1,y1); - glTexCoord2f(s1,t0); glVertex2f(x1,y0); + if (state->render) { + glTexCoord2f(s0,t0); glVertex2f(x0,y0); + glTexCoord2f(s0,t1); glVertex2f(x0,y1); + glTexCoord2f(s1,t1); glVertex2f(x1,y1); + glTexCoord2f(s1,t0); glVertex2f(x1,y0); + } } } void text_render_with_state(Font *font, TextRenderState *render_state, char const *text, float x, float y) { - text_chars_begin(font); + if (render_state->render) text_chars_begin(font); render_state->x = x; render_state->y = y; char32_t c = 0; @@ -257,28 +271,37 @@ void text_render_with_state(Font *font, TextRenderState *render_state, char cons } } } - text_chars_end(font); + if (render_state->render) text_chars_end(font); } -static void text_render_internal(Font *font, char const *text, float *x, float *y) { - TextRenderState render_state = {.x = 0, .y = 0, .min_x = -FLT_MAX, .max_x = FLT_MAX, .min_y = -FLT_MAX, .max_y = FLT_MAX}; +static void text_render_internal(Font *font, char const *text, float *x, float *y, bool render) { + TextRenderState render_state = {.x = 0, .y = 0, .min_x = -FLT_MAX, .max_x = FLT_MAX, .min_y = -FLT_MAX, .max_y = FLT_MAX, .render = render}; text_render_with_state(font, &render_state, text, *x, *y); *x = render_state.x; *y = render_state.y; } void text_render(Font *font, char const *text, float x, float y) { - text_render_internal(font, text, &x, &y); + text_render_internal(font, text, &x, &y, true); } void text_get_size(Font *font, char const *text, float *width, float *height) { float x = 0, y = 0; - text_render_internal(font, text, &x, &y); + text_render_internal(font, text, &x, &y, false); if (width) *width = x; if (height) *height = y + font->char_height * (2/3.0f); } +void text_get_size32(Font *font, char32_t const *text, u64 len, float *width, float *height) { + TextRenderState render_state = {.x = 0, .y = 0, .min_x = -FLT_MAX, .max_x = FLT_MAX, .min_y = -FLT_MAX, .max_y = FLT_MAX, .render = false}; + for (u64 i = 0; i < len; ++i) { + text_render_char(font, &render_state, text[i]); + } + if (width) *width = render_state.x; + if (height) *height = render_state.y + font->char_height * (2/3.0f); +} + void text_font_free(Font *font) { free(font->ttf_data); stbtt_bakedchar **char_pages = font->char_pages; @@ -11,6 +11,9 @@ typedef struct Font Font; typedef struct { + // should the text actually be rendered (set to false to get text size) + bool render; + float x, y; // points at which the text should be cut off float min_x, max_x, min_y, max_y; @@ -32,6 +35,7 @@ extern float text_font_char_width(Font *font); extern void text_render(Font *font, char const *text, float x, float y); // Get the dimensions of some text. extern void text_get_size(Font *font, char const *text, float *width, float *height); +extern void text_get_size32(Font *font, char32_t const *text, u64 len, float *width, float *height); // Write text, but using a state, starting at (x, y) -- state->x and state->y are ignored. This allows you to control min/max_x/y. extern void text_render_with_state(Font *font, TextRenderState *state, char const *text, float x, float y); // Begin writing characters. |