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gecko-dev/gfx/thebes/gfxSVGGlyphs.cpp

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/* 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 "mozilla/SVGContextPaint.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 "NullPrincipal.h"
#include "nsIInputStream.h"
#include "nsStringStream.h"
#include "nsStreamUtils.h"
#include "nsIPrincipal.h"
#include "mozilla/BasePrincipal.h"
#include "mozilla/dom/Element.h"
#include "mozilla/LoadInfo.h"
#include "nsSVGUtils.h"
#include "nsHostObjectProtocolHandler.h"
#include "nsContentUtils.h"
#include "gfxFont.h"
#include "nsSMILAnimationController.h"
#include "gfxContext.h"
#include "harfbuzz/hb.h"
#include "mozilla/dom/ImageTracker.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;
/* static */ const Color SimpleTextContextPaint::sZero = Color();
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);
nsCString 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.get());
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, gfx::IntRect(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(FlushType::Layout);
if (mDocument->HasAnimationController()) {
mDocument->GetAnimationController()
->Resume(nsSMILTimeContainer::PAUSE_IMAGE);
}
mDocument->ImageTracker()->SetAnimatingState(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
* @return true iff rendering succeeded
*/
void
gfxSVGGlyphs::RenderGlyph(gfxContext *aContext, uint32_t aGlyphId,
SVGContextPaint* aContextPaint)
{
gfxContextAutoSaveRestore aContextRestorer(aContext);
Element *glyph = mGlyphIdMap.Get(aGlyphId);
MOZ_ASSERT(glyph, "No glyph element. Should check with HasSVGGlyph() first!");
AutoSetRestoreSVGContextPaint autoSetRestore(aContextPaint, glyph->OwnerDoc());
nsSVGUtils::PaintSVGGlyph(glyph, aContext);
}
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);
}
size_t
gfxSVGGlyphs::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
// We don't include the size of mSVGData here, because (depending on the
// font backend implementation) it will either wrap a block of data owned
// by the system (and potentially shared), or a table that's in our font
// table cache and therefore already counted.
size_t result = aMallocSizeOf(this)
+ mGlyphDocs.ShallowSizeOfExcludingThis(aMallocSizeOf)
+ mGlyphIdMap.ShallowSizeOfExcludingThis(aMallocSizeOf);
for (auto iter = mGlyphDocs.ConstIter(); !iter.Done(); iter.Next()) {
result += iter.Data()->SizeOfIncludingThis(aMallocSizeOf);
}
return result;
}
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) {
mDocument->OnPageHide(false, nullptr);
}
if (mPresShell) {
mPresShell->RemovePostRefreshObserver(this);
}
if (mViewer) {
mViewer->Close(nullptr);
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.forget(), 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),
nullptr,
mSVGGlyphsDocumentURI);
rv = NS_NewURI(getter_AddRefs(uri), mSVGGlyphsDocumentURI);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIPrincipal> principal = NullPrincipal::Create();
auto styleBackend = nsLayoutUtils::StyloEnabled() ? StyleBackendType::Servo
: StyleBackendType::Gecko;
nsCOMPtr<nsIDOMDocument> domDoc;
rv = NS_NewDOMDocument(getter_AddRefs(domDoc),
EmptyString(), // aNamespaceURI
EmptyString(), // aQualifiedName
nullptr, // aDoctype
uri, uri, principal,
false, // aLoadedAsData
nullptr, // aEventObject
DocumentFlavorSVG,
styleBackend);
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, //aStream
principal,
nsILoadInfo::SEC_FORCE_INHERIT_PRINCIPAL,
nsIContentPolicy::TYPE_OTHER,
SVG_CONTENT_TYPE,
UTF8_CHARSET);
NS_ENSURE_SUCCESS(rv, rv);
// 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);
}
size_t
gfxSVGGlyphsDocument::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
{
return aMallocSizeOf(this)
+ mGlyphIdMap.ShallowSizeOfExcludingThis(aMallocSizeOf)
+ mSVGGlyphsDocumentURI.SizeOfExcludingThisIfUnshared(aMallocSizeOf);
}
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