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(stb.c) Fix growth conditional and limit growth to 2048x2048

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This commit is contained in:
Higor Eurípedes 2015-07-17 13:38:12 -03:00
parent 7f3424ab15
commit ab55ed7908
1 changed files with 35 additions and 15 deletions
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50
gfx/drivers_font_renderer/stb.c
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@ -57,19 +57,27 @@ static void font_renderer_stb_free(void *data)
}
static bool font_renderer_stb_create_atlas(stb_font_renderer_t *self,
uint8_t *font_data, float font_size)
uint8_t *font_data, float font_size, unsigned width, unsigned height)
{
int i;
stbtt_pack_context pc = {NULL};
stbtt_packedchar chardata[256];
self->atlas.width = self->atlas.height = 512;
if (width > 2048 || height > 2048)
{
RARCH_WARN("[stb] Font atlas too big: %ux%u\n", width, height);
goto error;
}
alloc_atlas:
self->atlas.buffer = (uint8_t*)calloc(self->atlas.height, self->atlas.width);
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)
return false;
goto error;
stbtt_PackBegin(&pc, self->atlas.buffer,
self->atlas.width, self->atlas.height,
@ -92,22 +100,34 @@ alloc_atlas:
g->height = c->y1 - c->y0;
/* make sure important characters fit */
if (isprint(i) && !isspace(i) && (!g->width || !g->height))
if (isalnum(i) && (!g->width || !g->height))
{
if (i != 160)
{
/* increase atlas by 20% in all directions */
self->atlas.width *= 1.2;
self->atlas.height *= 1.2;
int new_width = width * 1.2;
int new_height = height * 1.2;
free(self->atlas.buffer);
goto alloc_atlas;
break;
/* 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;
}
static void *font_renderer_stb_init(const char *font_path, float font_size)
@ -126,7 +146,7 @@ static void *font_renderer_stb_init(const char *font_path, float font_size)
if (!read_file(font_path, (void**)&font_data, NULL))
goto error;
if (!font_renderer_stb_create_atlas(self, font_data, font_size))
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)))