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
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef INCLUDED_VCL_GLYPHITEMCACHE_HXX
#define INCLUDED_VCL_GLYPHITEMCACHE_HXX
#include <sal/types.h>
#include <vcl/dllapi.h>
#include <o3tl/lru_map.hxx>
#include <o3tl/hash_combine.hxx>
#include <vcl/glyphitem.hxx>
#include <vcl/metric.hxx>
#include <vcl/outdev.hxx>
#include <vcl/vclptr.hxx>
#include <tools/gen.hxx>
#include <optional>
/**
A cache for SalLayoutGlyphs objects.
Allows caching for OutputDevice::DrawText() and similar calls. Pass the text and the output device
for the call to OutputDevice::ImplLayout(). Items are cached per output device and its font.
If something more changes, call clear().
*/
class VCL_DLLPUBLIC SalLayoutGlyphsCache final
{
public:
// NOTE: The lifetime of the returned value is guaranteed only until the next call
// to any function in this class.
const SalLayoutGlyphs* GetLayoutGlyphs(VclPtr<const OutputDevice> outputDevice,
const OUString& text,
const vcl::text::TextLayoutCache* layoutCache = nullptr)
{
return GetLayoutGlyphs(outputDevice, text, 0, text.getLength(), 0, layoutCache);
}
const SalLayoutGlyphs* GetLayoutGlyphs(VclPtr<const OutputDevice> outputDevice,
const OUString& text, sal_Int32 nIndex, sal_Int32 nLen,
tools::Long nLogicWidth = 0,
const vcl::text::TextLayoutCache* layoutCache = nullptr);
void clear();
static SalLayoutGlyphsCache* self();
SalLayoutGlyphsCache(int size) // needs to be public for vcl::DeleteOnDeinit
: mCachedGlyphs(size)
{
}
private:
struct CachedGlyphsKey
{
OUString text;
sal_Int32 index;
sal_Int32 len;
tools::Long logicWidth;
FontMetric fontMetric;
double fontScaleX;
double fontScaleY;
MapMode mapMode;
bool rtl;
bool artificialItalic;
bool artificialBold;
vcl::text::ComplexTextLayoutFlags layoutMode;
LanguageType digitLanguage;
size_t hashValue;
CachedGlyphsKey(const VclPtr<const OutputDevice>& dev, const OUString& t, sal_Int32 i,
sal_Int32 l, tools::Long w);
bool operator==(const CachedGlyphsKey& other) const;
};
struct CachedGlyphsHash
{
size_t operator()(const CachedGlyphsKey& key) const { return key.hashValue; }
};
struct GlyphsCost
{
size_t operator()(const SalLayoutGlyphs&) const;
};
typedef o3tl::lru_map<CachedGlyphsKey, SalLayoutGlyphs, CachedGlyphsHash,
std::equal_to<CachedGlyphsKey>, GlyphsCost>
GlyphsCache;
GlyphsCache mCachedGlyphs;
// Last temporary glyphs returned (pointer is returned, so the object needs to be kept somewhere).
std::optional<CachedGlyphsKey> mLastTemporaryKey;
SalLayoutGlyphs mLastTemporaryGlyphs;
// If set, info about the last call which wanted a substring of the full text.
std::optional<CachedGlyphsKey> mLastSubstringKey;
SalLayoutGlyphsCache(const SalLayoutGlyphsCache&) = delete;
SalLayoutGlyphsCache& operator=(const SalLayoutGlyphsCache&) = delete;
};
#endif // INCLUDED_VCL_GLYPHITEMCACHE_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
