static void *font_renderer_stb_init(const char *font_path, float font_size)
{
int ascent, descent, line_gap;
stbtt_fontinfo info;
uint8_t *font_data = NULL;
stb_font_renderer_t *self = (stb_font_renderer_t*) calloc(1, sizeof(*self));
/* See https://github.com/nothings/stb/blob/master/stb_truetype.h#L539 */
font_size = STBTT_POINT_SIZE(font_size);
if (!self)
goto error;
if (!filestream_read_file(font_path, (void**)&font_data, NULL))
goto error;
if (!font_renderer_stb_create_atlas(self, font_data, font_size, 512, 512))
goto error;
if (!stbtt_InitFont(&info, font_data, stbtt_GetFontOffsetForIndex(font_data, 0)))
goto error;
stbtt_GetFontVMetrics(&info, &ascent, &descent, &line_gap);
self->line_height = ascent - descent;
if (font_size < 0)
self->line_height *= stbtt_ScaleForMappingEmToPixels(&info, -font_size);
else
self->line_height *= stbtt_ScaleForPixelHeight(&info, font_size);
free(font_data);
return self;
error:
if (font_data)
free(font_data);
if (self)
font_renderer_stb_free(self);
return NULL;
}
static void *font_renderer_stb_init(const char *font_path, float font_size)
{
uint8_t *font_data = NULL;
int ascent, descent, line_gap;
stbtt_fontinfo info;
stb_font_renderer_t *self = (stb_font_renderer_t*) calloc(1, sizeof(*self));
/* prevent warnings */
(void)rect_width_compare;
if (!self)
goto error;
if (!read_file(font_path, (void**)&font_data, NULL))
goto error;
if (!font_renderer_stb_create_atlas(self, font_data, font_size))
goto error;
if (!stbtt_InitFont(&info, font_data, stbtt_GetFontOffsetForIndex(font_data, 0)))
goto error;
stbtt_GetFontVMetrics(&info, &ascent, &descent, &line_gap);
self->line_height = ascent - descent;// + line_gap;
if (font_size < 0)
self->line_height *= stbtt_ScaleForMappingEmToPixels(&info, -font_size);
else
self->line_height *= stbtt_ScaleForPixelHeight(&info, font_size);
free(font_data);
return self;
error:
if (font_data)
free(font_data);
font_renderer_stb_free(self);
return NULL;
}
static bool font_renderer_stb_create_atlas(stb_font_renderer_t *self,
uint8_t *font_data, float font_size, unsigned width, unsigned height)
{
int i;
stbtt_pack_context pc = {NULL};
stbtt_packedchar chardata[256];
if (width > 2048 || height > 2048)
{
RARCH_WARN("[stb] Font atlas too big: %ux%u\n", width, height);
goto error;
}
if (self->atlas.buffer)
free(self->atlas.buffer);
self->atlas.buffer = (uint8_t*)calloc(height, width);
self->atlas.width = width;
self->atlas.height = height;
if (!self->atlas.buffer)
goto error;
stbtt_PackBegin(&pc, self->atlas.buffer,
self->atlas.width, self->atlas.height,
self->atlas.width, 1, NULL);
stbtt_PackFontRange(&pc, font_data, 0, font_size, 0, 256, chardata);
stbtt_PackEnd(&pc);
for (i = 0; i < 256; ++i)
{
struct font_glyph *g = &self->glyphs[i];
stbtt_packedchar *c = &chardata[i];
g->advance_x = c->xadvance;
g->atlas_offset_x = c->x0;
g->atlas_offset_y = c->y0;
g->draw_offset_x = c->xoff;
g->draw_offset_y = c->yoff;
g->width = c->x1 - c->x0;
g->height = c->y1 - c->y0;
/* Make sure important characters fit */
if (isalnum(i) && (!g->width || !g->height))
{
int new_width = width * 1.2;
int new_height = height * 1.2;
/* Limit growth to 2048x2048 unless we already reached that */
if (width < 2048 || height < 2048)
{
new_width = MIN(new_width, 2048);
new_height = MIN(new_height, 2048);
}
return font_renderer_stb_create_atlas(self, font_data, font_size,
new_width, new_height);
}
}
return true;
error:
self->atlas.width = self->atlas.height = 0;
if (self->atlas.buffer)
free(self->atlas.buffer);
self->atlas.buffer = NULL;
return false;
}
