зеркало из https://github.com/mozilla/gecko-dev.git
307 строки
11 KiB
C++
307 строки
11 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Foundation code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2008
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* John Daggett <jdaggett@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef GFX_USER_FONT_SET_H
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#define GFX_USER_FONT_SET_H
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#include "gfxTypes.h"
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#include "gfxFont.h"
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#include "gfxFontUtils.h"
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#include "nsRefPtrHashtable.h"
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#include "nsAutoPtr.h"
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#include "nsCOMPtr.h"
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#include "nsIURI.h"
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#include "nsIFile.h"
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#include "nsISupportsImpl.h"
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#include "nsIScriptError.h"
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class nsIURI;
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class gfxMixedFontFamily;
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// parsed CSS @font-face rule information
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// lifetime: from when @font-face rule processed until font is loaded
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struct gfxFontFaceSrc {
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bool mIsLocal; // url or local
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// if url, whether to use the origin principal or not
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bool mUseOriginPrincipal;
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// format hint flags, union of all possible formats
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// (e.g. TrueType, EOT, SVG, etc.)
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// see FLAG_FORMAT_* enum values below
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PRUint32 mFormatFlags;
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nsString mLocalName; // full font name if local
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nsCOMPtr<nsIURI> mURI; // uri if url
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nsCOMPtr<nsIURI> mReferrer; // referrer url if url
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nsCOMPtr<nsISupports> mOriginPrincipal; // principal if url
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};
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// Subclassed to store platform-specific code cleaned out when font entry is
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// deleted.
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// Lifetime: from when platform font is created until it is deactivated.
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// If the platform does not need to add any platform-specific code/data here,
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// then the gfxUserFontSet will allocate a base gfxUserFontData and attach
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// to the entry to track the basic user font info fields here.
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class gfxUserFontData {
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public:
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gfxUserFontData()
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: mSrcIndex(0), mFormat(0), mMetaOrigLen(0)
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{ }
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virtual ~gfxUserFontData() { }
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nsTArray<PRUint8> mMetadata; // woff metadata block (compressed), if any
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nsCOMPtr<nsIURI> mURI; // URI of the source, if it was url()
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nsString mLocalName; // font name used for the source, if local()
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nsString mRealName; // original fullname from the font resource
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PRUint32 mSrcIndex; // index in the rule's source list
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PRUint32 mFormat; // format hint for the source used, if any
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PRUint32 mMetaOrigLen; // length needed to decompress metadata
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};
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// initially contains a set of proxy font entry objects, replaced with
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// platform/user fonts as downloaded
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class gfxMixedFontFamily : public gfxFontFamily {
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public:
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friend class gfxUserFontSet;
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gfxMixedFontFamily(const nsAString& aName)
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: gfxFontFamily(aName) { }
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virtual ~gfxMixedFontFamily() { }
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void AddFontEntry(gfxFontEntry *aFontEntry) {
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nsRefPtr<gfxFontEntry> fe = aFontEntry;
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mAvailableFonts.AppendElement(fe);
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aFontEntry->SetFamily(this);
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}
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void ReplaceFontEntry(gfxFontEntry *aOldFontEntry, gfxFontEntry *aNewFontEntry)
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{
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PRUint32 numFonts = mAvailableFonts.Length();
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for (PRUint32 i = 0; i < numFonts; i++) {
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gfxFontEntry *fe = mAvailableFonts[i];
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if (fe == aOldFontEntry) {
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aOldFontEntry->SetFamily(nsnull);
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// note that this may delete aOldFontEntry, if there's no
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// other reference to it except from its family
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mAvailableFonts[i] = aNewFontEntry;
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aNewFontEntry->SetFamily(this);
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return;
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}
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}
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}
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void RemoveFontEntry(gfxFontEntry *aFontEntry)
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{
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PRUint32 numFonts = mAvailableFonts.Length();
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for (PRUint32 i = 0; i < numFonts; i++) {
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gfxFontEntry *fe = mAvailableFonts[i];
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if (fe == aFontEntry) {
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aFontEntry->SetFamily(nsnull);
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mAvailableFonts.RemoveElementAt(i);
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return;
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}
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}
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}
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// temp method to determine if all proxies are loaded
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bool AllLoaded()
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{
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PRUint32 numFonts = mAvailableFonts.Length();
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for (PRUint32 i = 0; i < numFonts; i++) {
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gfxFontEntry *fe = mAvailableFonts[i];
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if (fe->mIsProxy)
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return PR_FALSE;
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}
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return PR_TRUE;
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}
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};
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class gfxProxyFontEntry;
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class THEBES_API gfxUserFontSet {
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public:
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NS_INLINE_DECL_REFCOUNTING(gfxUserFontSet)
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gfxUserFontSet();
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virtual ~gfxUserFontSet();
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enum {
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// no flags ==> no hint set
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// unknown ==> unknown format hint set
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FLAG_FORMAT_UNKNOWN = 1,
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FLAG_FORMAT_OPENTYPE = 1 << 1,
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FLAG_FORMAT_TRUETYPE = 1 << 2,
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FLAG_FORMAT_TRUETYPE_AAT = 1 << 3,
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FLAG_FORMAT_EOT = 1 << 4,
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FLAG_FORMAT_SVG = 1 << 5,
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FLAG_FORMAT_WOFF = 1 << 6,
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// mask of all unused bits, update when adding new formats
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FLAG_FORMAT_NOT_USED = ~((1 << 7)-1)
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};
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enum LoadStatus {
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STATUS_LOADING = 0,
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STATUS_LOADED,
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STATUS_FORMAT_NOT_SUPPORTED,
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STATUS_ERROR,
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STATUS_END_OF_LIST
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};
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// add in a font face
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// weight, stretch - 0 == unknown, [1, 9] otherwise
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// italic style = constants in gfxFontConstants.h, e.g. NS_FONT_STYLE_NORMAL
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// TODO: support for unicode ranges not yet implemented
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gfxFontEntry *AddFontFace(const nsAString& aFamilyName,
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const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
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PRUint32 aWeight,
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PRUint32 aStretch,
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PRUint32 aItalicStyle,
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const nsString& aFeatureSettings,
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const nsString& aLanguageOverride,
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gfxSparseBitSet *aUnicodeRanges = nsnull);
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// add in a font face for which we have the gfxFontEntry already
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void AddFontFace(const nsAString& aFamilyName, gfxFontEntry* aFontEntry);
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// Whether there is a face with this family name
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bool HasFamily(const nsAString& aFamilyName) const
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{
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return GetFamily(aFamilyName) != nsnull;
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}
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// lookup a font entry for a given style, returns null if not loaded
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gfxFontEntry *FindFontEntry(const nsAString& aName,
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const gfxFontStyle& aFontStyle,
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bool& aFoundFamily,
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bool& aNeedsBold,
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bool& aWaitForUserFont);
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// initialize the process that loads external font data, which upon
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// completion will call OnLoadComplete method
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virtual nsresult StartLoad(gfxProxyFontEntry *aProxy,
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const gfxFontFaceSrc *aFontFaceSrc) = 0;
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// when download has been completed, pass back data here
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// aDownloadStatus == NS_OK ==> download succeeded, error otherwise
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// returns true if platform font creation sucessful (or local()
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// reference was next in line)
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// Ownership of aFontData is passed in here; the font set must
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// ensure that it is eventually deleted with NS_Free().
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bool OnLoadComplete(gfxProxyFontEntry *aProxy,
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const PRUint8 *aFontData, PRUint32 aLength,
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nsresult aDownloadStatus);
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// Replace a proxy with a real fontEntry; this is implemented in
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// nsUserFontSet in order to keep track of the entry corresponding
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// to each @font-face rule.
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virtual void ReplaceFontEntry(gfxProxyFontEntry *aProxy,
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gfxFontEntry *aFontEntry) = 0;
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// generation - each time a face is loaded, generation is
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// incremented so that the change can be recognized
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PRUint64 GetGeneration() { return mGeneration; }
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// increment the generation on font load
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void IncrementGeneration();
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protected:
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// for a given proxy font entry, attempt to load the next resource
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// in the src list
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LoadStatus LoadNext(gfxProxyFontEntry *aProxyEntry);
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gfxMixedFontFamily *GetFamily(const nsAString& aName) const;
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// report a problem of some kind (implemented in nsUserFontSet)
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virtual nsresult LogMessage(gfxProxyFontEntry *aProxy,
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const char *aMessage,
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PRUint32 aFlags = nsIScriptError::errorFlag,
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nsresult aStatus = 0) = 0;
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// font families defined by @font-face rules
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nsRefPtrHashtable<nsStringHashKey, gfxMixedFontFamily> mFontFamilies;
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PRUint64 mGeneration;
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static PRLogModuleInfo *sUserFontsLog;
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};
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// acts a placeholder until the real font is downloaded
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class gfxProxyFontEntry : public gfxFontEntry {
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friend class gfxUserFontSet;
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public:
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gfxProxyFontEntry(const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
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gfxMixedFontFamily *aFamily,
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PRUint32 aWeight,
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PRUint32 aStretch,
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PRUint32 aItalicStyle,
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const nsTArray<gfxFontFeature>& aFeatureSettings,
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PRUint32 aLanguageOverride,
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gfxSparseBitSet *aUnicodeRanges);
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virtual ~gfxProxyFontEntry();
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virtual gfxFont *CreateFontInstance(const gfxFontStyle *aFontStyle, bool aNeedsBold);
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// note that code depends on the ordering of these values!
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enum LoadingState {
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NOT_LOADING = 0, // not started to load any font resources yet
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LOADING_STARTED, // loading has started; hide fallback font
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LOADING_ALMOST_DONE, // timeout happened but we're nearly done,
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// so keep hiding fallback font
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LOADING_SLOWLY, // timeout happened and we're not nearly done,
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// so use the fallback font
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LOADING_FAILED // failed to load any source: use fallback
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};
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LoadingState mLoadingState;
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nsTArray<gfxFontFaceSrc> mSrcList;
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PRUint32 mSrcIndex; // index of loading src item
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};
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#endif /* GFX_USER_FONT_SET_H */
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