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
|
// -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
#ifndef __gccache_hh
#define __gccache_hh
extern "C" {
#include <X11/Xlib.h>
}
#include "display.hh"
#include "color.hh"
namespace otk {
class GCCacheItem;
class GCCacheContext {
public:
void set(const Color &_color, const XFontStruct * const _font,
const int _function, const int _subwindow, const int _linewidth);
void set(const XFontStruct * const _font);
~GCCacheContext(void);
private:
GCCacheContext()
: gc(0), pixel(0ul), fontid(0ul),
function(0), subwindow(0), used(false), screen(~(0u)), linewidth(0) {}
GC gc;
unsigned long pixel;
unsigned long fontid;
int function;
int subwindow;
bool used;
unsigned int screen;
int linewidth;
GCCacheContext(const GCCacheContext &_nocopy);
GCCacheContext &operator=(const GCCacheContext &_nocopy);
friend class GCCache;
friend class GCCacheItem;
};
class GCCacheItem {
public:
inline const GC &gc(void) const { return ctx->gc; }
private:
GCCacheItem(void) : ctx(0), count(0), hits(0), fault(false) { }
GCCacheContext *ctx;
unsigned int count;
unsigned int hits;
bool fault;
GCCacheItem(const GCCacheItem &_nocopy);
GCCacheItem &operator=(const GCCacheItem &_nocopy);
friend class GCCache;
};
class GCCache {
public:
GCCache(unsigned int screen_count);
~GCCache(void);
// cleans up the cache
void purge(void);
GCCacheItem *find(const Color &_color, const XFontStruct * const _font = 0,
int _function = GXcopy, int _subwindow = ClipByChildren,
int _linewidth = 0);
void release(GCCacheItem *_item);
private:
GCCacheContext *nextContext(unsigned int _screen);
void release(GCCacheContext *ctx);
// this is closely modelled after the Qt GC cache, but with some of the
// complexity stripped out
const unsigned int context_count;
const unsigned int cache_size;
const unsigned int cache_buckets;
const unsigned int cache_total_size;
GCCacheContext **contexts;
GCCacheItem **cache;
};
class Pen {
public:
inline Pen(const Color &_color, const XFontStruct * const _font = 0,
int _linewidth = 0, int _function = GXcopy,
int _subwindow = ClipByChildren)
: color(_color), font(_font), linewidth(_linewidth), function(_function),
subwindow(_subwindow), cache(display->gcCache()), item(0) { }
inline ~Pen(void) { if (item) cache->release(item); }
inline const GC &gc(void) const {
if (! item) item = cache->find(color, font, function, subwindow,
linewidth);
return item->gc();
}
private:
const Color &color;
const XFontStruct *font;
int linewidth;
int function;
int subwindow;
mutable GCCache *cache;
mutable GCCacheItem *item;
};
}
#endif // __gccache_hh
|
