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