gfx/skia/trunk/include/core/SkFontHost.h@129ffea94266 (annotated)
gfx/skia/trunk/include/core/SkFontHost.h
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
| michael@0 | 1 | |
| michael@0 | 2 | /* |
| michael@0 | 3 | * Copyright 2006 The Android Open Source Project |
| michael@0 | 4 | * |
| michael@0 | 5 | * Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 6 | * found in the LICENSE file. |
| michael@0 | 7 | */ |
| michael@0 | 8 | |
| michael@0 | 9 | |
| michael@0 | 10 | #ifndef SkFontHost_DEFINED |
| michael@0 | 11 | #define SkFontHost_DEFINED |
| michael@0 | 12 | |
| michael@0 | 13 | #include "SkTypeface.h" |
| michael@0 | 14 | |
| michael@0 | 15 | class SkDescriptor; |
| michael@0 | 16 | class SkScalerContext; |
| michael@0 | 17 | struct SkScalerContextRec; |
| michael@0 | 18 | class SkStream; |
| michael@0 | 19 | class SkWStream; |
| michael@0 | 20 | |
| michael@0 | 21 | /** \class SkFontHost |
| michael@0 | 22 | |
| michael@0 | 23 | This class is ported to each environment. It is responsible for bridging |
| michael@0 | 24 | the gap between the (sort of) abstract class SkTypeface and the |
| michael@0 | 25 | platform-specific implementation that provides access to font files. |
| michael@0 | 26 | |
| michael@0 | 27 | One basic task is for each create (subclass of) SkTypeface, the FontHost is |
| michael@0 | 28 | responsible for assigning a uniqueID. The ID should be unique for the |
| michael@0 | 29 | underlying font file/data, not unique per typeface instance. Thus it is |
| michael@0 | 30 | possible/common to request a typeface for the same font more than once |
| michael@0 | 31 | (e.g. asking for the same font by name several times). The FontHost may |
| michael@0 | 32 | return seperate typeface instances in that case, or it may choose to use a |
| michael@0 | 33 | cache and return the same instance (but calling typeface->ref(), since the |
| michael@0 | 34 | caller is always responsible for calling unref() on each instance that is |
| michael@0 | 35 | returned). Either way, the fontID for those instance(s) will be the same. |
| michael@0 | 36 | In addition, the fontID should never be set to 0. That value is used as a |
| michael@0 | 37 | sentinel to indicate no-font-id. |
| michael@0 | 38 | |
| michael@0 | 39 | The major aspects are: |
| michael@0 | 40 | 1) Given either a name/style, return a subclass of SkTypeface that |
| michael@0 | 41 | references the closest matching font available on the host system. |
| michael@0 | 42 | 2) Given the data for a font (either in a stream or a file name), return |
| michael@0 | 43 | a typeface that allows access to that data. |
| michael@0 | 44 | 3) Each typeface instance carries a 32bit ID for its corresponding font. |
| michael@0 | 45 | SkFontHost turns that ID into a stream to access the font's data. |
| michael@0 | 46 | 4) Given a font ID, return a subclass of SkScalerContext, which connects a |
| michael@0 | 47 | font scaler (e.g. freetype or other) to the font's data. |
| michael@0 | 48 | 5) Utilites to manage the font cache (budgeting) and gamma correction |
| michael@0 | 49 | */ |
| michael@0 | 50 | class SK_API SkFontHost { |
| michael@0 | 51 | public: |
| michael@0 | 52 | /** LCDs either have their color elements arranged horizontally or |
| michael@0 | 53 | vertically. When rendering subpixel glyphs we need to know which way |
| michael@0 | 54 | round they are. |
| michael@0 | 55 | |
| michael@0 | 56 | Note, if you change this after startup, you'll need to flush the glyph |
| michael@0 | 57 | cache because it'll have the wrong type of masks cached. |
| michael@0 | 58 | |
| michael@0 | 59 | @deprecated use SkPixelGeometry instead. |
| michael@0 | 60 | */ |
| michael@0 | 61 | enum LCDOrientation { |
| michael@0 | 62 | kHorizontal_LCDOrientation = 0, //!< this is the default |
| michael@0 | 63 | kVertical_LCDOrientation = 1 |
| michael@0 | 64 | }; |
| michael@0 | 65 | |
| michael@0 | 66 | /** @deprecated set on Device creation. */ |
| michael@0 | 67 | static void SetSubpixelOrientation(LCDOrientation orientation); |
| michael@0 | 68 | /** @deprecated get from Device. */ |
| michael@0 | 69 | static LCDOrientation GetSubpixelOrientation(); |
| michael@0 | 70 | |
| michael@0 | 71 | /** LCD color elements can vary in order. For subpixel text we need to know |
| michael@0 | 72 | the order which the LCDs uses so that the color fringes are in the |
| michael@0 | 73 | correct place. |
| michael@0 | 74 | |
| michael@0 | 75 | Note, if you change this after startup, you'll need to flush the glyph |
| michael@0 | 76 | cache because it'll have the wrong type of masks cached. |
| michael@0 | 77 | |
| michael@0 | 78 | kNONE_LCDOrder means that the subpixel elements are not spatially |
| michael@0 | 79 | separated in any usable fashion. |
| michael@0 | 80 | |
| michael@0 | 81 | @deprecated use SkPixelGeometry instead. |
| michael@0 | 82 | */ |
| michael@0 | 83 | enum LCDOrder { |
| michael@0 | 84 | kRGB_LCDOrder = 0, //!< this is the default |
| michael@0 | 85 | kBGR_LCDOrder = 1, |
| michael@0 | 86 | kNONE_LCDOrder = 2 |
| michael@0 | 87 | }; |
| michael@0 | 88 | |
| michael@0 | 89 | /** @deprecated set on Device creation. */ |
| michael@0 | 90 | static void SetSubpixelOrder(LCDOrder order); |
| michael@0 | 91 | /** @deprecated get from Device. */ |
| michael@0 | 92 | static LCDOrder GetSubpixelOrder(); |
| michael@0 | 93 | |
| michael@0 | 94 | private: |
| michael@0 | 95 | /** Return a new, closest matching typeface given either an existing family |
| michael@0 | 96 | (specified by a typeface in that family) or by a familyName and a |
| michael@0 | 97 | requested style. |
| michael@0 | 98 | 1) If familyFace is null, use familyName. |
| michael@0 | 99 | 2) If familyName is null, use data (UTF-16 to cover). |
| michael@0 | 100 | 3) If all are null, return the default font that best matches style |
| michael@0 | 101 | */ |
| michael@0 | 102 | static SkTypeface* CreateTypeface(const SkTypeface* familyFace, |
| michael@0 | 103 | const char familyName[], |
| michael@0 | 104 | SkTypeface::Style style); |
| michael@0 | 105 | |
| michael@0 | 106 | /** Return a new typeface given the data buffer. If the data does not |
| michael@0 | 107 | represent a valid font, returns null. |
| michael@0 | 108 | |
| michael@0 | 109 | If a typeface instance is returned, the caller is responsible for |
| michael@0 | 110 | calling unref() on the typeface when they are finished with it. |
| michael@0 | 111 | |
| michael@0 | 112 | The returned typeface may or may not have called ref() on the stream |
| michael@0 | 113 | parameter. If the typeface has not called ref(), then it may have made |
| michael@0 | 114 | a copy of the releveant data. In either case, the caller is still |
| michael@0 | 115 | responsible for its refcnt ownership of the stream. |
| michael@0 | 116 | */ |
| michael@0 | 117 | static SkTypeface* CreateTypefaceFromStream(SkStream*); |
| michael@0 | 118 | |
| michael@0 | 119 | /** Return a new typeface from the specified file path. If the file does not |
| michael@0 | 120 | represent a valid font, this returns null. If a typeface is returned, |
| michael@0 | 121 | the caller is responsible for calling unref() when it is no longer used. |
| michael@0 | 122 | */ |
| michael@0 | 123 | static SkTypeface* CreateTypefaceFromFile(const char path[]); |
| michael@0 | 124 | |
| michael@0 | 125 | /////////////////////////////////////////////////////////////////////////// |
| michael@0 | 126 | |
| michael@0 | 127 | friend class SkScalerContext; |
| michael@0 | 128 | friend class SkTypeface; |
| michael@0 | 129 | }; |
| michael@0 | 130 | |
| michael@0 | 131 | #endif |
