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Allow setting custom glyphset size (#1542) 

* Properly set glyphset size

* Rename `MAX_GLYPHSET` to `GLYPHSET_SIZE`

* Use more appropriate types for font metrics
This commit is contained in:
Guldoman 2023-07-04 05:50:28 +02:00 committed by George Sokianos
parent 819bd81293
commit 608ad159cd
1 changed files with 17 additions and 14 deletions
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31
src/renderer.c
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@ -16,8 +16,9 @@
#include "renderer.h"
#include "renwindow.h"
#define MAX_GLYPHSET 256
#define MAX_LOADABLE_GLYPHSETS 4096
#define MAX_UNICODE 0x100000
#define GLYPHSET_SIZE 256
#define MAX_LOADABLE_GLYPHSETS (MAX_UNICODE / GLYPHSET_SIZE)
#define SUBPIXEL_BITMAPS_CACHED 3
RenWindow window_renderer = {0};
@ -37,14 +38,14 @@ static void* check_alloc(void *ptr) {
/************************* Fonts *************************/
typedef struct {
unsigned short x0, x1, y0, y1, loaded;
short bitmap_left, bitmap_top;
unsigned int x0, x1, y0, y1, loaded;
int bitmap_left, bitmap_top;
float xadvance;
} GlyphMetric;
typedef struct {
SDL_Surface* surface;
GlyphMetric metrics[MAX_GLYPHSET];
GlyphMetric metrics[GLYPHSET_SIZE];
} GlyphSet;
typedef struct RenFont {
@ -128,14 +129,14 @@ static void font_load_glyphset(RenFont* font, int idx) {
for (int j = 0, pen_x = 0; j < bitmaps_cached; ++j) {
GlyphSet* set = check_alloc(calloc(1, sizeof(GlyphSet)));
font->sets[j][idx] = set;
for (int i = 0; i < MAX_GLYPHSET; ++i) {
int glyph_index = FT_Get_Char_Index(font->face, i + idx * MAX_GLYPHSET);
for (int i = 0; i < GLYPHSET_SIZE; ++i) {
int glyph_index = FT_Get_Char_Index(font->face, i + idx * GLYPHSET_SIZE);
if (!glyph_index || FT_Load_Glyph(font->face, glyph_index, load_option | FT_LOAD_BITMAP_METRICS_ONLY)
|| font_set_style(&font->face->glyph->outline, j * (64 / SUBPIXEL_BITMAPS_CACHED), font->style) || FT_Render_Glyph(font->face->glyph, render_option)) {
continue;
}
FT_GlyphSlot slot = font->face->glyph;
int glyph_width = slot->bitmap.width / byte_width;
unsigned int glyph_width = slot->bitmap.width / byte_width;
if (font->antialiasing == FONT_ANTIALIASING_NONE)
glyph_width *= 8;
set->metrics[i] = (GlyphMetric){ pen_x, pen_x + glyph_width, 0, slot->bitmap.rows, true, slot->bitmap_left, slot->bitmap_top, (slot->advance.x + slot->lsb_delta - slot->rsb_delta) / 64.0f};
@ -153,8 +154,8 @@ static void font_load_glyphset(RenFont* font, int idx) {
continue;
set->surface = check_alloc(SDL_CreateRGBSurface(0, pen_x, font->max_height, font->antialiasing == FONT_ANTIALIASING_SUBPIXEL ? 24 : 8, 0, 0, 0, 0));
uint8_t* pixels = set->surface->pixels;
for (int i = 0; i < MAX_GLYPHSET; ++i) {
int glyph_index = FT_Get_Char_Index(font->face, i + idx * MAX_GLYPHSET);
for (int i = 0; i < GLYPHSET_SIZE; ++i) {
int glyph_index = FT_Get_Char_Index(font->face, i + idx * GLYPHSET_SIZE);
if (!glyph_index || FT_Load_Glyph(font->face, glyph_index, load_option))
continue;
FT_GlyphSlot slot = font->face->glyph;
@ -178,7 +179,7 @@ static void font_load_glyphset(RenFont* font, int idx) {
}
static GlyphSet* font_get_glyphset(RenFont* font, unsigned int codepoint, int subpixel_idx) {
int idx = (codepoint >> 8) % MAX_LOADABLE_GLYPHSETS;
int idx = (codepoint / GLYPHSET_SIZE) % MAX_LOADABLE_GLYPHSETS;
if (!font->sets[font->antialiasing == FONT_ANTIALIASING_SUBPIXEL ? subpixel_idx : 0][idx])
font_load_glyphset(font, idx);
return font->sets[font->antialiasing == FONT_ANTIALIASING_SUBPIXEL ? subpixel_idx : 0][idx];
@ -192,7 +193,7 @@ static RenFont* font_group_get_glyph(GlyphSet** set, GlyphMetric** metric, RenFo
bitmap_index += SUBPIXEL_BITMAPS_CACHED;
for (int i = 0; i < FONT_FALLBACK_MAX && fonts[i]; ++i) {
*set = font_get_glyphset(fonts[i], codepoint, bitmap_index);
*metric = &(*set)->metrics[codepoint % 256];
*metric = &(*set)->metrics[codepoint % GLYPHSET_SIZE];
if ((*metric)->loaded || codepoint < 0xFF)
return fonts[i];
}
@ -323,14 +324,16 @@ void ren_font_free(RenFont* font) {
}
void ren_font_group_set_tab_size(RenFont **fonts, int n) {
unsigned int tab_index = '\t' % GLYPHSET_SIZE;
for (int j = 0; j < FONT_FALLBACK_MAX && fonts[j]; ++j) {
for (int i = 0; i < (fonts[j]->antialiasing == FONT_ANTIALIASING_SUBPIXEL ? SUBPIXEL_BITMAPS_CACHED : 1); ++i)
font_get_glyphset(fonts[j], '\t', i)->metrics['\t'].xadvance = fonts[j]->space_advance * n;
font_get_glyphset(fonts[j], '\t', i)->metrics[tab_index].xadvance = fonts[j]->space_advance * n;
}
}
int ren_font_group_get_tab_size(RenFont **fonts) {
float advance = font_get_glyphset(fonts[0], '\t', 0)->metrics['\t'].xadvance;
unsigned int tab_index = '\t' % GLYPHSET_SIZE;
float advance = font_get_glyphset(fonts[0], '\t', 0)->metrics[tab_index].xadvance;
if (fonts[0]->space_advance) {
advance /= fonts[0]->space_advance;
}