The Tor Browser: gfx/thebes/gfxSVGGlyphs.cpp@6474c204b198 (annotated)

gfx/thebes/gfxSVGGlyphs.cpp@6474c204b198 (annotated)

gfx/thebes/gfxSVGGlyphs.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* 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/. */
 #include "gfxSVGGlyphs.h"
 #include "nsError.h"
 #include "nsIDOMDocument.h"
 #include "nsString.h"
 #include "nsIDocument.h"
 #include "nsICategoryManager.h"
 #include "nsIDocumentLoaderFactory.h"
 #include "nsIContentViewer.h"
 #include "nsIStreamListener.h"
 #include "nsServiceManagerUtils.h"
 #include "nsIPresShell.h"
 #include "nsNetUtil.h"
 #include "nsIInputStream.h"
 #include "nsStringStream.h"
 #include "nsStreamUtils.h"
 #include "nsIPrincipal.h"
 #include "mozilla/dom/Element.h"
 #include "nsSVGUtils.h"
 #include "nsIScriptSecurityManager.h"
 #include "nsHostObjectProtocolHandler.h"
 #include "nsContentUtils.h"
 #include "gfxFont.h"
 #include "nsSMILAnimationController.h"
 #include "gfxContext.h"
 #include "gfxColor.h"
 #include "harfbuzz/hb.h"
 #define SVG_CONTENT_TYPE NS_LITERAL_CSTRING("image/svg+xml")
 #define UTF8_CHARSET NS_LITERAL_CSTRING("utf-8")
 using namespace mozilla;
 typedef mozilla::dom::Element Element;
 mozilla::gfx::UserDataKey gfxTextContextPaint::sUserDataKey;
 const gfxRGBA SimpleTextContextPaint::sZero = gfxRGBA(0.0f, 0.0f, 0.0f, 0.0f);
 gfxSVGGlyphs::gfxSVGGlyphs(hb_blob_t *aSVGTable, gfxFontEntry *aFontEntry)
     : mSVGData(aSVGTable)
     , mFontEntry(aFontEntry)
 {
     unsigned int length;
     const char* svgData = hb_blob_get_data(mSVGData, &length);
     mHeader = reinterpret_cast<const Header*>(svgData);
     mDocIndex = nullptr;
     if (sizeof(Header) <= length && uint16_t(mHeader->mVersion) == 0 &&
         uint64_t(mHeader->mDocIndexOffset) + 2 <= length) {
         const DocIndex* docIndex = reinterpret_cast<const DocIndex*>
             (svgData + mHeader->mDocIndexOffset);
         // Limit the number of documents to avoid overflow
         if (uint64_t(mHeader->mDocIndexOffset) + 2 +
                 uint16_t(docIndex->mNumEntries) * sizeof(IndexEntry) <= length) {
             mDocIndex = docIndex;
         }
     }
 }
 gfxSVGGlyphs::~gfxSVGGlyphs()
 {
     hb_blob_destroy(mSVGData);
 }
 void
 gfxSVGGlyphs::DidRefresh()
 {
     mFontEntry->NotifyGlyphsChanged();
 }
 /*
  * Comparison operator for finding a range containing a given glyph ID. Simply
  *   checks whether |key| is less (greater) than every element of |range|, in
  *   which case return |key| < |range| (|key| > |range|). Otherwise |key| is in
  *   |range|, in which case return equality.
  * The total ordering here is guaranteed by
  *   (1) the index ranges being disjoint; and
  *   (2) the (sole) key always being a singleton, so intersection => containment
  *       (note that this is wrong if we have more than one intersection or two
  *        sets intersecting of size > 1 -- so... don't do that)
  */
 /* static */ int
 gfxSVGGlyphs::CompareIndexEntries(const void *aKey, const void *aEntry)
 {
     const uint32_t key = *(uint32_t*)aKey;
     const IndexEntry *entry = (const IndexEntry*)aEntry;
     if (key < uint16_t(entry->mStartGlyph)) {
         return -1;
     }
     if (key > uint16_t(entry->mEndGlyph)) {
         return 1;
     }
     return 0;
 }
 gfxSVGGlyphsDocument *
 gfxSVGGlyphs::FindOrCreateGlyphsDocument(uint32_t aGlyphId)
 {
     if (!mDocIndex) {
         // Invalid table
         return nullptr;
     }
     IndexEntry *entry = (IndexEntry*)bsearch(&aGlyphId, mDocIndex->mEntries,
                                              uint16_t(mDocIndex->mNumEntries),
                                              sizeof(IndexEntry),
                                              CompareIndexEntries);
     if (!entry) {
         return nullptr;
     }
     gfxSVGGlyphsDocument *result = mGlyphDocs.Get(entry->mDocOffset);
     if (!result) {
         unsigned int length;
         const uint8_t *data = (const uint8_t*)hb_blob_get_data(mSVGData, &length);
         if (entry->mDocOffset > 0 &&
             uint64_t(mHeader->mDocIndexOffset) + entry->mDocOffset + entry->mDocLength <= length) {
             result = new gfxSVGGlyphsDocument(data + mHeader->mDocIndexOffset + entry->mDocOffset,
                                               entry->mDocLength, this);
             mGlyphDocs.Put(entry->mDocOffset, result);
         }
     }
     return result;
 }
 nsresult
 gfxSVGGlyphsDocument::SetupPresentation()
 {
     nsCOMPtr<nsICategoryManager> catMan = do_GetService(NS_CATEGORYMANAGER_CONTRACTID);
     nsXPIDLCString contractId;
     nsresult rv = catMan->GetCategoryEntry("Gecko-Content-Viewers", "image/svg+xml", getter_Copies(contractId));
     NS_ENSURE_SUCCESS(rv, rv);
     nsCOMPtr<nsIDocumentLoaderFactory> docLoaderFactory = do_GetService(contractId);
     NS_ASSERTION(docLoaderFactory, "Couldn't get DocumentLoaderFactory");
     nsCOMPtr<nsIContentViewer> viewer;
     rv = docLoaderFactory->CreateInstanceForDocument(nullptr, mDocument, nullptr, getter_AddRefs(viewer));
     NS_ENSURE_SUCCESS(rv, rv);
     rv = viewer->Init(nullptr, nsIntRect(0, 0, 1000, 1000));
     if (NS_SUCCEEDED(rv)) {
         rv = viewer->Open(nullptr, nullptr);
         NS_ENSURE_SUCCESS(rv, rv);
     }
     nsCOMPtr<nsIPresShell> presShell;
     rv = viewer->GetPresShell(getter_AddRefs(presShell));
     NS_ENSURE_SUCCESS(rv, rv);
     nsPresContext* presContext = presShell->GetPresContext();
     presContext->SetIsGlyph(true);
     if (!presShell->DidInitialize()) {
         nsRect rect = presContext->GetVisibleArea();
         rv = presShell->Initialize(rect.width, rect.height);
         NS_ENSURE_SUCCESS(rv, rv);
     }
     mDocument->FlushPendingNotifications(Flush_Layout);
     nsSMILAnimationController* controller = mDocument->GetAnimationController();
     if (controller) {
       controller->Resume(nsSMILTimeContainer::PAUSE_IMAGE);
     }
     mDocument->SetImagesNeedAnimating(true);
     mViewer = viewer;
     mPresShell = presShell;
     mPresShell->AddPostRefreshObserver(this);
     return NS_OK;
 }
 void
 gfxSVGGlyphsDocument::DidRefresh()
 {
     mOwner->DidRefresh();
 }
 /**
  * Walk the DOM tree to find all glyph elements and insert them into the lookup
  * table
  * @param aElem The element to search from
  */
 void
 gfxSVGGlyphsDocument::FindGlyphElements(Element *aElem)
 {
     for (nsIContent *child = aElem->GetLastChild(); child;
             child = child->GetPreviousSibling()) {
         if (!child->IsElement()) {
             continue;
         }
         FindGlyphElements(child->AsElement());
     }
     InsertGlyphId(aElem);
 }
 /**
  * If there exists an SVG glyph with the specified glyph id, render it and return true
  * If no such glyph exists, or in the case of an error return false
  * @param aContext The thebes aContext to draw to
  * @param aGlyphId The glyph id
  * @param aDrawMode Whether to fill or stroke or both (see |DrawMode|)
  * @return true iff rendering succeeded
  */
 bool
 gfxSVGGlyphs::RenderGlyph(gfxContext *aContext, uint32_t aGlyphId,
                           DrawMode aDrawMode, gfxTextContextPaint *aContextPaint)
 {
     if (aDrawMode == DrawMode::GLYPH_PATH) {
         return false;
     }
     gfxContextAutoSaveRestore aContextRestorer(aContext);
     Element *glyph = mGlyphIdMap.Get(aGlyphId);
     NS_ASSERTION(glyph, "No glyph element. Should check with HasSVGGlyph() first!");
     return nsSVGUtils::PaintSVGGlyph(glyph, aContext, aDrawMode, aContextPaint);
 }
 bool
 gfxSVGGlyphs::GetGlyphExtents(uint32_t aGlyphId, const gfxMatrix& aSVGToAppSpace,
                               gfxRect *aResult)
 {
     Element *glyph = mGlyphIdMap.Get(aGlyphId);
     NS_ASSERTION(glyph, "No glyph element. Should check with HasSVGGlyph() first!");
     return nsSVGUtils::GetSVGGlyphExtents(glyph, aSVGToAppSpace, aResult);
 }
 Element *
 gfxSVGGlyphs::GetGlyphElement(uint32_t aGlyphId)
 {
     Element *elem;
     if (!mGlyphIdMap.Get(aGlyphId, &elem)) {
         elem = nullptr;
         if (gfxSVGGlyphsDocument *set = FindOrCreateGlyphsDocument(aGlyphId)) {
             elem = set->GetGlyphElement(aGlyphId);
         }
         mGlyphIdMap.Put(aGlyphId, elem);
     }
     return elem;
 }
 bool
 gfxSVGGlyphs::HasSVGGlyph(uint32_t aGlyphId)
 {
     return !!GetGlyphElement(aGlyphId);
 }
 Element *
 gfxSVGGlyphsDocument::GetGlyphElement(uint32_t aGlyphId)
 {
     return mGlyphIdMap.Get(aGlyphId);
 }
 gfxSVGGlyphsDocument::gfxSVGGlyphsDocument(const uint8_t *aBuffer,
                                            uint32_t aBufLen,
                                            gfxSVGGlyphs *aSVGGlyphs)
     : mOwner(aSVGGlyphs)
 {
     ParseDocument(aBuffer, aBufLen);
     if (!mDocument) {
         NS_WARNING("Could not parse SVG glyphs document");
         return;
     }
     Element *root = mDocument->GetRootElement();
     if (!root) {
         NS_WARNING("Could not parse SVG glyphs document");
         return;
     }
     nsresult rv = SetupPresentation();
     if (NS_FAILED(rv)) {
         NS_WARNING("Couldn't setup presentation for SVG glyphs document");
         return;
     }
     FindGlyphElements(root);
 }
 gfxSVGGlyphsDocument::~gfxSVGGlyphsDocument()
 {
     if (mDocument) {
         nsSMILAnimationController* controller = mDocument->GetAnimationController();
         if (controller) {
             controller->Pause(nsSMILTimeContainer::PAUSE_PAGEHIDE);
         }
     }
     if (mPresShell) {
         mPresShell->RemovePostRefreshObserver(this);
     }
     if (mViewer) {
         mViewer->Destroy();
     }
 }
 static nsresult
 CreateBufferedStream(const uint8_t *aBuffer, uint32_t aBufLen,
                      nsCOMPtr<nsIInputStream> &aResult)
 {
     nsCOMPtr<nsIInputStream> stream;
     nsresult rv = NS_NewByteInputStream(getter_AddRefs(stream),
                                         reinterpret_cast<const char *>(aBuffer),
                                         aBufLen, NS_ASSIGNMENT_DEPEND);
     NS_ENSURE_SUCCESS(rv, rv);
     nsCOMPtr<nsIInputStream> aBufferedStream;
     if (!NS_InputStreamIsBuffered(stream)) {
         rv = NS_NewBufferedInputStream(getter_AddRefs(aBufferedStream), stream, 4096);
         NS_ENSURE_SUCCESS(rv, rv);
         stream = aBufferedStream;
     }
     aResult = stream;
     return NS_OK;
 }
 nsresult
 gfxSVGGlyphsDocument::ParseDocument(const uint8_t *aBuffer, uint32_t aBufLen)
 {
     // Mostly pulled from nsDOMParser::ParseFromStream
     nsCOMPtr<nsIInputStream> stream;
     nsresult rv = CreateBufferedStream(aBuffer, aBufLen, stream);
     NS_ENSURE_SUCCESS(rv, rv);
     nsCOMPtr<nsIURI> uri;
     nsHostObjectProtocolHandler::GenerateURIString(NS_LITERAL_CSTRING(FONTTABLEURI_SCHEME),
                                                    mSVGGlyphsDocumentURI);
     rv = NS_NewURI(getter_AddRefs(uri), mSVGGlyphsDocumentURI);
     NS_ENSURE_SUCCESS(rv, rv);
     nsCOMPtr<nsIPrincipal> principal;
     nsContentUtils::GetSecurityManager()->
         GetNoAppCodebasePrincipal(uri, getter_AddRefs(principal));
     nsCOMPtr<nsIDOMDocument> domDoc;
     rv = NS_NewDOMDocument(getter_AddRefs(domDoc),
                            EmptyString(),   // aNamespaceURI
                            EmptyString(),   // aQualifiedName
                            nullptr,          // aDoctype
                            uri, uri, principal,
                            false,           // aLoadedAsData
                            nullptr,          // aEventObject
                            DocumentFlavorSVG);
     NS_ENSURE_SUCCESS(rv, rv);
     nsCOMPtr<nsIDocument> document(do_QueryInterface(domDoc));
     if (!document) {
         return NS_ERROR_FAILURE;
     }
     nsCOMPtr<nsIChannel> channel;
     rv = NS_NewInputStreamChannel(getter_AddRefs(channel), uri, nullptr /* stream */,
                                   SVG_CONTENT_TYPE, UTF8_CHARSET);
     NS_ENSURE_SUCCESS(rv, rv);
     channel->SetOwner(principal);
     // Set this early because various decisions during page-load depend on it.
     document->SetIsBeingUsedAsImage();
     document->SetReadyStateInternal(nsIDocument::READYSTATE_UNINITIALIZED);
     nsCOMPtr<nsIStreamListener> listener;
     rv = document->StartDocumentLoad("external-resource", channel,
                                      nullptr,    // aLoadGroup
                                      nullptr,    // aContainer
                                      getter_AddRefs(listener),
                                      true /* aReset */);
     if (NS_FAILED(rv) || !listener) {
         return NS_ERROR_FAILURE;
     }
     rv = listener->OnStartRequest(channel, nullptr /* aContext */);
     if (NS_FAILED(rv)) {
         channel->Cancel(rv);
     }
     nsresult status;
     channel->GetStatus(&status);
     if (NS_SUCCEEDED(rv) && NS_SUCCEEDED(status)) {
         rv = listener->OnDataAvailable(channel, nullptr /* aContext */, stream, 0, aBufLen);
         if (NS_FAILED(rv)) {
             channel->Cancel(rv);
         }
         channel->GetStatus(&status);
     }
     rv = listener->OnStopRequest(channel, nullptr /* aContext */, status);
     NS_ENSURE_SUCCESS(rv, NS_ERROR_FAILURE);
     document.swap(mDocument);
     return NS_OK;
 }
 void
 gfxSVGGlyphsDocument::InsertGlyphId(Element *aGlyphElement)
 {
     nsAutoString glyphIdStr;
     static const uint32_t glyphPrefixLength = 5;
     // The maximum glyph ID is 65535 so the maximum length of the numeric part
     // is 5.
     if (!aGlyphElement->GetAttr(kNameSpaceID_None, nsGkAtoms::id, glyphIdStr) ||
         !StringBeginsWith(glyphIdStr, NS_LITERAL_STRING("glyph")) ||
         glyphIdStr.Length() > glyphPrefixLength + 5) {
         return;
     }
     uint32_t id = 0;
     for (uint32_t i = glyphPrefixLength; i < glyphIdStr.Length(); ++i) {
       char16_t ch = glyphIdStr.CharAt(i);
       if (ch < '0' || ch > '9') {
         return;
       }
       if (ch == '0' && i == glyphPrefixLength) {
         return;
       }
       id = id * 10 + (ch - '0');
     }
     mGlyphIdMap.Put(id, aGlyphElement);
 }
 void
 gfxTextContextPaint::InitStrokeGeometry(gfxContext *aContext,
                                         float devUnitsPerSVGUnit)
 {
     mStrokeWidth = aContext->CurrentLineWidth() / devUnitsPerSVGUnit;
     aContext->CurrentDash(mDashes, &mDashOffset);
     for (uint32_t i = 0; i < mDashes.Length(); i++) {
         mDashes[i] /= devUnitsPerSVGUnit;
     }
     mDashOffset /= devUnitsPerSVGUnit;
 }

The Tor Browser / annotate

gfx/thebes/gfxSVGGlyphs.cpp@6474c204b198 (annotated)

gfx/thebes/gfxSVGGlyphs.cpp