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
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
#ifndef GFX_TextRenderer_H
#define GFX_TextRenderer_H
#include "mozilla/EnumeratedArray.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/UniquePtr.h"
#include "nsISupportsImpl.h"
#include <string>
namespace mozilla {
namespace layers {
class Compositor;
class TextureSource;
class TextureSourceProvider;
struct FontBitmapInfo;
class TextRenderer final {
~TextRenderer();
public:
NS_INLINE_DECL_REFCOUNTING(TextRenderer)
enum class FontType { Default, FixedWidth, NumTypes };
TextRenderer() = default;
RefPtr<TextureSource> RenderText(TextureSourceProvider* aProvider,
const std::string& aText,
uint32_t aTargetPixelWidth,
FontType aFontType);
void RenderText(Compositor* aCompositor, const std::string& aText,
const gfx::IntPoint& aOrigin,
const gfx::Matrix4x4& aTransform, uint32_t aTextSize,
uint32_t aTargetPixelWidth,
FontType aFontType = FontType::Default);
gfx::IntSize ComputeSurfaceSize(const std::string& aText,
uint32_t aTargetPixelWidth,
FontType aFontType = FontType::Default);
void RenderTextToDrawTarget(gfx::DrawTarget* aDrawTarget,
const std::string& aText,
uint32_t aTargetPixelWidth,
FontType aFontType = FontType::Default);
struct FontCache {
~FontCache();
RefPtr<gfx::DataSourceSurface> mGlyphBitmaps;
gfx::DataSourceSurface::MappedSurface mMap;
const FontBitmapInfo* mInfo;
};
protected:
// Note that this may still fail to set mGlyphBitmaps to a valid value
// if the underlying CreateDataSourceSurface fails for some reason.
bool EnsureInitialized(FontType aType);
static const FontBitmapInfo* GetFontInfo(FontType aType);
private:
EnumeratedArray<FontType, FontType::NumTypes, UniquePtr<FontCache>> mFonts;
};
struct FontBitmapInfo {
Maybe<unsigned int> mGlyphWidth;
Maybe<const unsigned short*> mGlyphWidths;
unsigned int mTextureWidth;
unsigned int mTextureHeight;
unsigned int mCellWidth;
unsigned int mCellHeight;
unsigned int mFirstChar;
const unsigned char* mPNG;
size_t mPNGLength;
unsigned int GetGlyphWidth(char aGlyph) const {
if (mGlyphWidth) {
return mGlyphWidth.value();
}
MOZ_ASSERT(unsigned(aGlyph) >= mFirstChar);
return mGlyphWidths.value()[unsigned(aGlyph) - mFirstChar];
}
};
} // namespace layers
} // namespace mozilla
#endif
|
