1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
#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_irect 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_irect 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_irect;
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;
}
|
