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#include "fitz-internal.h"
#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
{
int refs;
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;
int aa;
};
void
fz_new_glyph_cache_context(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_LOCK_GLYPHCACHE);
}
fz_catch(ctx)
{
fz_free(ctx, cache);
fz_rethrow(ctx);
}
cache->total = 0;
cache->refs = 1;
ctx->glyph_cache = cache;
}
/* The glyph cache lock is always held when this function is called. */
static void
fz_evict_glyph_cache(fz_context *ctx)
{
fz_glyph_cache *cache = ctx->glyph_cache;
fz_glyph_key *key;
fz_pixmap *pixmap;
int i;
for (i = 0; i < fz_hash_len(ctx, cache->hash); i++)
{
key = fz_hash_get_key(ctx, cache->hash, i);
if (key->font)
fz_drop_font(ctx, key->font);
pixmap = fz_hash_get_val(ctx, cache->hash, i);
if (pixmap)
fz_drop_pixmap(ctx, pixmap);
}
cache->total = 0;
fz_empty_hash(ctx, cache->hash);
}
void
fz_drop_glyph_cache_context(fz_context *ctx)
{
if (!ctx->glyph_cache)
return;
fz_lock(ctx, FZ_LOCK_GLYPHCACHE);
ctx->glyph_cache->refs--;
if (ctx->glyph_cache->refs == 0)
{
fz_evict_glyph_cache(ctx);
fz_free_hash(ctx, ctx->glyph_cache->hash);
fz_free(ctx, ctx->glyph_cache);
ctx->glyph_cache = NULL;
}
fz_unlock(ctx, FZ_LOCK_GLYPHCACHE);
}
fz_glyph_cache *
fz_keep_glyph_cache(fz_context *ctx)
{
fz_lock(ctx, FZ_LOCK_GLYPHCACHE);
ctx->glyph_cache->refs++;
fz_unlock(ctx, FZ_LOCK_GLYPHCACHE);
return ctx->glyph_cache;
}
fz_pixmap *
fz_render_stroked_glyph(fz_context *ctx, fz_font *font, int gid, fz_matrix trm, fz_matrix ctm, fz_stroke_state *stroke, fz_bbox scissor)
{
if (font->ft_face)
{
if (stroke->dash_len > 0)
return NULL;
return fz_render_ft_stroked_glyph(ctx, font, gid, trm, ctm, stroke);
}
return fz_render_glyph(ctx, font, gid, trm, NULL, scissor);
}
/*
Render a glyph and return a bitmap.
If the glyph is too large to fit the cache we have two choices:
1) Return NULL so the caller can draw the glyph using an outline.
Only supported for freetype fonts.
2) Render a clipped glyph by using the scissor rectangle.
Only supported for type 3 fonts.
This must not be inserted into the cache.
*/
fz_pixmap *
fz_render_glyph(fz_context *ctx, fz_font *font, int gid, fz_matrix ctm, fz_colorspace *model, fz_bbox scissor)
{
fz_glyph_cache *cache;
fz_glyph_key key;
fz_pixmap *val;
float size = fz_matrix_expansion(ctm);
int do_cache;
if (size <= MAX_GLYPH_SIZE)
{
scissor = fz_infinite_bbox;
do_cache = 1;
}
else
{
if (font->ft_face)
return NULL;
do_cache = 0;
}
cache = ctx->glyph_cache;
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;
key.aa = fz_aa_level(ctx);
ctm.e = floorf(ctm.e) + key.e / 256.0f;
ctm.f = floorf(ctm.f) + key.f / 256.0f;
fz_lock(ctx, FZ_LOCK_GLYPHCACHE);
val = fz_hash_find(ctx, cache->hash, &key);
if (val)
{
fz_keep_pixmap(ctx, val);
fz_unlock(ctx, FZ_LOCK_GLYPHCACHE);
return val;
}
fz_try(ctx)
{
if (font->ft_face)
{
val = fz_render_ft_glyph(ctx, font, gid, ctm, key.aa);
}
else if (font->t3procs)
{
/* We drop the glyphcache here, and execute the t3
* glyph code. The danger here is that some other
* thread will come along, and want the same glyph
* too. If it does, we may both end up rendering
* pixmaps. We cope with this later on, by ensuring
* that only one gets inserted into the cache. If
* we insert ours to find one already there, we
* abandon ours, and use the one there already.
*/
fz_unlock(ctx, FZ_LOCK_GLYPHCACHE);
val = fz_render_t3_glyph(ctx, font, gid, ctm, model, scissor);
fz_lock(ctx, FZ_LOCK_GLYPHCACHE);
}
else
{
fz_warn(ctx, "assert: uninitialized font structure");
val = NULL;
}
}
fz_catch(ctx)
{
fz_unlock(ctx, FZ_LOCK_GLYPHCACHE);
fz_rethrow(ctx);
}
if (val && do_cache)
{
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);
fz_try(ctx)
{
fz_pixmap *pix = fz_hash_insert(ctx, cache->hash, &key, val);
if (pix)
{
fz_drop_pixmap(ctx, val);
val = pix;
}
else
fz_keep_font(ctx, key.font);
val = fz_keep_pixmap(ctx, val);
}
fz_catch(ctx)
{
fz_warn(ctx, "Failed to encache glyph - continuing");
}
cache->total += val->w * val->h;
}
}
fz_unlock(ctx, FZ_LOCK_GLYPHCACHE);
return val;
}
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