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#include "fitz.h"
#define MAX_FONT_SIZE 1000
#define MAX_GLYPH_SIZE 256
#define MAX_CACHE_SIZE (1024*1024)
typedef struct fz_glyph_key_s fz_glyph_key;
struct fz_glyph_cache_s
{
fz_hash_table *hash;
int total;
};
struct fz_glyph_key_s
{
fz_font *font;
int a, b;
int c, d;
unsigned short gid;
unsigned char e, f;
};
fz_glyph_cache *
fz_new_glyph_cache(fz_context *ctx)
{
fz_glyph_cache *cache;
cache = fz_malloc_struct(ctx, fz_glyph_cache);
fz_try(ctx)
{
cache->hash = fz_new_hash_table(ctx, 509, sizeof(fz_glyph_key));
}
fz_catch(ctx)
{
fz_free(ctx, cache);
fz_rethrow(ctx);
}
cache->total = 0;
return cache;
}
static void
fz_evict_glyph_cache(fz_context *ctx, fz_glyph_cache *cache)
{
fz_glyph_key *key;
fz_pixmap *pixmap;
int i;
for (i = 0; i < fz_hash_len(cache->hash); i++)
{
key = fz_hash_get_key(cache->hash, i);
if (key->font)
fz_drop_font(ctx, key->font);
pixmap = fz_hash_get_val(cache->hash, i);
if (pixmap)
fz_drop_pixmap(ctx, pixmap);
}
cache->total = 0;
fz_empty_hash(cache->hash);
}
void
fz_free_glyph_cache(fz_context *ctx, fz_glyph_cache *cache)
{
if (!cache)
return;
fz_evict_glyph_cache(ctx, cache);
fz_free_hash(cache->hash);
fz_free(ctx, cache);
}
fz_pixmap *
fz_render_stroked_glyph(fz_context *ctx, fz_glyph_cache *cache, fz_font *font, int gid, fz_matrix trm, fz_matrix ctm, fz_stroke_state *stroke)
{
if (font->ft_face)
return fz_render_ft_stroked_glyph(ctx, font, gid, trm, ctm, stroke);
return fz_render_glyph(ctx, cache, font, gid, trm, NULL);
}
fz_pixmap *
fz_render_glyph(fz_context *ctx, fz_glyph_cache *cache, fz_font *font, int gid, fz_matrix ctm, fz_colorspace *model)
{
fz_glyph_key key;
fz_pixmap *val;
float size = fz_matrix_expansion(ctm);
if (size > MAX_FONT_SIZE)
{
/* TODO: this case should be handled by rendering glyph as a path fill */
fz_warn(ctx, "font size too large (%g), not rendering glyph", size);
return NULL;
}
memset(&key, 0, sizeof key);
key.font = font;
key.gid = gid;
key.a = ctm.a * 65536;
key.b = ctm.b * 65536;
key.c = ctm.c * 65536;
key.d = ctm.d * 65536;
key.e = (ctm.e - floorf(ctm.e)) * 256;
key.f = (ctm.f - floorf(ctm.f)) * 256;
val = fz_hash_find(cache->hash, &key);
if (val)
return fz_keep_pixmap(val);
ctm.e = floorf(ctm.e) + key.e / 256.0f;
ctm.f = floorf(ctm.f) + key.f / 256.0f;
if (font->ft_face)
{
val = fz_render_ft_glyph(ctx, font, gid, ctm);
}
else if (font->t3procs)
{
val = fz_render_t3_glyph(ctx, font, gid, ctm, model);
}
else
{
fz_warn(ctx, "assert: uninitialized font structure");
return NULL;
}
if (val)
{
if (val->w < MAX_GLYPH_SIZE && val->h < MAX_GLYPH_SIZE)
{
if (cache->total + val->w * val->h > MAX_CACHE_SIZE)
fz_evict_glyph_cache(ctx, cache);
fz_try(ctx)
{
fz_hash_insert(cache->hash, &key, val);
fz_keep_font(key.font);
val = fz_keep_pixmap(val);
}
fz_catch(ctx)
{
fz_warn(ctx, "Failed to encache glyph - continuing");
}
cache->total += val->w * val->h;
return val;
}
return val;
}
return NULL;
}
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