The Tor Browser: layout/inspector/nsFontFaceList.cpp@8bccb770b82d

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 #include "nsFontFaceList.h"

     6 #include "nsFontFace.h"

     7 #include "nsFontFaceLoader.h"

     8 #include "nsIFrame.h"

     9 #include "gfxFont.h"

    10 #include "mozilla/gfx/2D.h"

    12 nsFontFaceList::nsFontFaceList()

    13 {

    14 }

    16 nsFontFaceList::~nsFontFaceList()

    17 {

    18 }

    20 ////////////////////////////////////////////////////////////////////////

    21 // nsISupports

    23 NS_IMPL_ISUPPORTS(nsFontFaceList, nsIDOMFontFaceList)

    25 ////////////////////////////////////////////////////////////////////////

    26 // nsIDOMFontFaceList

    28 /* nsIDOMFontFace item (in unsigned long index); */

    29 struct FindByIndexData {

    30   uint32_t mTarget;

    31   uint32_t mCurrent;

    32   nsIDOMFontFace* mResult;

    33 };

    35 static PLDHashOperator

    36 FindByIndex(gfxFontEntry* aKey, nsIDOMFontFace* aData, void* aUserData)

    37 {

    38   FindByIndexData* data = static_cast<FindByIndexData*>(aUserData);

    39   if (data->mCurrent == data->mTarget) {

    40     data->mResult = aData;

    41     return PL_DHASH_STOP;

    42   }

    43   data->mCurrent++;

    44   return PL_DHASH_NEXT;

    45 }

    47 NS_IMETHODIMP

    48 nsFontFaceList::Item(uint32_t index, nsIDOMFontFace **_retval)

    49 {

    50   NS_ENSURE_TRUE(index < mFontFaces.Count(), NS_ERROR_INVALID_ARG);

    51   FindByIndexData userData;

    52   userData.mTarget = index;

    53   userData.mCurrent = 0;

    54   userData.mResult = nullptr;

    55   mFontFaces.EnumerateRead(FindByIndex, &userData);

    56   NS_ASSERTION(userData.mResult != nullptr, "null entry in nsFontFaceList?");

    57   NS_IF_ADDREF(*_retval = userData.mResult);

    58   return NS_OK;

    59 }

    61 /* readonly attribute unsigned long length; */

    62 NS_IMETHODIMP

    63 nsFontFaceList::GetLength(uint32_t *aLength)

    64 {

    65   *aLength = mFontFaces.Count();

    66   return NS_OK;

    67 }

    69 ////////////////////////////////////////////////////////////////////////

    70 // nsFontFaceList

    72 nsresult

    73 nsFontFaceList::AddFontsFromTextRun(gfxTextRun* aTextRun,

    74                                     uint32_t aOffset, uint32_t aLength)

    75 {

    76   gfxTextRun::GlyphRunIterator iter(aTextRun, aOffset, aLength);

    77   while (iter.NextRun()) {

    78     gfxFontEntry *fe = iter.GetGlyphRun()->mFont->GetFontEntry();

    79     // if we have already listed this face, just make sure the match type is

    80     // recorded

    81     nsFontFace* existingFace =

    82       static_cast<nsFontFace*>(mFontFaces.GetWeak(fe));

    83     if (existingFace) {

    84       existingFace->AddMatchType(iter.GetGlyphRun()->mMatchType);

    85     } else {

    86       // A new font entry we haven't seen before

    87       nsRefPtr<nsFontFace> ff =

    88         new nsFontFace(fe, aTextRun->GetFontGroup(),

    89                        iter.GetGlyphRun()->mMatchType);

    90       mFontFaces.Put(fe, ff);

    91     }

    92   }

    94   return NS_OK;

    95 }

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