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b=419718, extend canvas checks, r=stuart

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This commit is contained in:
vladimir@pobox.com 2008-03-06 11:56:47 -08:00
parent f2f61ab3c0
commit 134de18d19
1 changed files with 70 additions and 37 deletions
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107
content/canvas/src/nsCanvasRenderingContext2D.cpp
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@ -420,6 +420,31 @@ protected:
PRInt32 *widthOut, PRInt32 *heightOut,
nsIPrincipal **prinOut,
PRBool *forceWriteOnlyOut);
// other helpers
void GetAppUnitsValues(PRUint32 *perDevPixel, PRUint32 *perCSSPixel) {
// If we don't have a canvas element, we just return something generic.
PRUint32 devPixel = 60;
PRUint32 cssPixel = 60;
nsCOMPtr<nsINode> elem = do_QueryInterface(mCanvasElement);
if (elem) {
nsIDocument *doc = elem->GetOwnerDoc();
if (!doc) goto FINISH;
nsIPresShell *ps = doc->GetPrimaryShell();
if (!ps) goto FINISH;
nsPresContext *pc = ps->GetPresContext();
if (!pc) goto FINISH;
devPixel = pc->AppUnitsPerDevPixel();
cssPixel = pc->AppUnitsPerCSSPixel();
}
FINISH:
if (perDevPixel)
*perDevPixel = devPixel;
if (cssPixel)
*perCSSPixel = cssPixel;
}
};
NS_IMPL_ADDREF(nsCanvasRenderingContext2D)
@ -570,7 +595,13 @@ nsCanvasRenderingContext2D::DoDrawImageSecurityCheck(nsIPrincipal* aPrincipal,
PRBool forceWriteOnly)
{
NS_PRECONDITION(aPrincipal, "Must have a principal here");
// Callers should ensure that mCanvasElement is non-null before calling this
if (!mCanvasElement) {
NS_WARNING("DoDrawImageSecurityCheck called without canvas element!");
return;
}
if (mCanvasElement->IsWriteOnly())
return;
@ -610,6 +641,9 @@ nsCanvasRenderingContext2D::ApplyStyle(PRInt32 aWhichStyle)
nsCanvasPattern* pattern = CurrentState().patternStyles[aWhichStyle];
if (pattern) {
if (!mCanvasElement)
return;
DoDrawImageSecurityCheck(pattern->Principal(),
pattern->GetForceWriteOnly());
pattern->Apply(mCairo);
@ -1432,21 +1466,28 @@ nsCanvasRenderingContext2D::SetMozTextStyle(const nsAString& textStyle)
if(mTextStyle.Equals(textStyle)) return NS_OK;
nsCOMPtr<nsINode> elem = do_QueryInterface(mCanvasElement);
NS_ASSERTION(elem, "Canvas element must be a dom node");
if (!elem) {
NS_WARNING("Canvas element must be an nsINode and non-null");
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsIPrincipal> elemPrincipal;
nsCOMPtr<nsIDocument> elemDocument;
nsIPrincipal* elemPrincipal = elem->NodePrincipal();
nsIDocument* elemDocument = elem->GetOwnerDoc();
elemPrincipal = elem->NodePrincipal();
elemDocument = elem->GetOwnerDoc();
if (!elemDocument || !elemPrincipal) {
NS_WARNING("Element is missing document or principal");
return NS_ERROR_FAILURE;
}
NS_ASSERTION(elemDocument && elemPrincipal, "Element is missing document or principal");
nsIPresShell* presShell = elemDocument->GetPrimaryShell();
if (!presShell)
return NS_ERROR_FAILURE;
nsIURI *docURL = elemDocument->GetDocumentURI();
nsIURI *baseURL = elemDocument->GetBaseURI();
nsCString langGroup;
elemDocument->GetPrimaryShell()->GetPresContext()->GetLangGroup()->ToUTF8String(langGroup);
presShell->GetPresContext()->GetLangGroup()->ToUTF8String(langGroup);
nsCOMArray<nsIStyleRule> rules;
PRBool changed;
@ -1469,14 +1510,14 @@ nsCanvasRenderingContext2D::SetMozTextStyle(const nsAString& textStyle)
rules.AppendObject(rule);
nsStyleSet *styleSet = elemDocument->GetPrimaryShell()->StyleSet();
nsStyleSet *styleSet = presShell->StyleSet();
nsRefPtr<nsStyleContext> sc = styleSet->ResolveStyleForRules(nsnull,rules);
const nsStyleFont *fontStyle = sc->GetStyleFont();
NS_ASSERTION(fontStyle, "Could not obtain font style");
PRUint32 aupdp = elemDocument->GetPrimaryShell()->GetPresContext()->AppUnitsPerDevPixel();
PRUint32 aupdp = presShell->GetPresContext()->AppUnitsPerDevPixel();
gfxFontStyle style(fontStyle->mFont.style,
fontStyle->mFont.weight,
@ -1514,16 +1555,13 @@ gfxFontGroup *nsCanvasRenderingContext2D::GetCurrentFontStyle()
NS_IMETHODIMP
nsCanvasRenderingContext2D::MozDrawText(const nsAString& textToDraw)
{
nsCOMPtr<nsINode> elem = do_QueryInterface(mCanvasElement);
NS_ASSERTION(elem, "Canvas element must be an nsINode");
nsCOMPtr<nsIDocument> elemDocument(elem->GetOwnerDoc());
const PRUnichar* textdata;
textToDraw.GetData(&textdata);
PRUint32 textrunflags = 0;
PRUint32 aupdp = elemDocument->GetPrimaryShell()->GetPresContext()->AppUnitsPerDevPixel();
PRUint32 aupdp;
GetAppUnitsValues(&aupdp, NULL);
gfxTextRunCache::AutoTextRun textRun;
textRun = gfxTextRunCache::MakeTextRun(textdata,
@ -1554,16 +1592,12 @@ nsCanvasRenderingContext2D::MozDrawText(const nsAString& textToDraw)
NS_IMETHODIMP
nsCanvasRenderingContext2D::MozMeasureText(const nsAString& textToMeasure, float *retVal)
{
nsCOMPtr<nsINode> elem = do_QueryInterface(mCanvasElement);
NS_ASSERTION(elem, "Canvas element must be an nsINode");
nsCOMPtr<nsIDocument> elemDocument(elem->GetOwnerDoc());
const PRUnichar* textdata;
textToMeasure.GetData(&textdata);
PRUint32 textrunflags = 0;
PRUint32 aupdp = elemDocument->GetPrimaryShell()->GetPresContext()->AppUnitsPerDevPixel();
PRUint32 aupdp, aupcp;
GetAppUnitsValues(&aupdp, &aupcp);
gfxTextRunCache::AutoTextRun textRun;
textRun = gfxTextRunCache::MakeTextRun(textdata,
@ -1580,23 +1614,20 @@ nsCanvasRenderingContext2D::MozMeasureText(const nsAString& textToMeasure, float
gfxTextRun::Metrics metrics = textRun->MeasureText(/* offset = */ 0, textToMeasure.Length(),
tightBoundingBox, mThebesContext,
nsnull);
*retVal = float(metrics.mAdvanceWidth/gfxFloat(elemDocument->GetPrimaryShell()->GetPresContext()->AppUnitsPerCSSPixel()));
*retVal = float(metrics.mAdvanceWidth/gfxFloat(aupcp));
return NS_OK;
}
NS_IMETHODIMP
nsCanvasRenderingContext2D::MozPathText(const nsAString& textToPath)
{
nsCOMPtr<nsINode> elem = do_QueryInterface(mCanvasElement);
NS_ASSERTION(elem, "Canvas element must be an nsINode");
nsCOMPtr<nsIDocument> elemDocument(elem->GetOwnerDoc());
const PRUnichar* textdata;
textToPath.GetData(&textdata);
PRUint32 textrunflags = 0;
PRUint32 aupdp = elemDocument->GetPrimaryShell()->GetPresContext()->AppUnitsPerDevPixel();
PRUint32 aupdp;
GetAppUnitsValues(&aupdp, NULL);
gfxTextRunCache::AutoTextRun textRun;
textRun = gfxTextRunCache::MakeTextRun(textdata,
@ -1626,16 +1657,13 @@ nsCanvasRenderingContext2D::MozTextAlongPath(const nsAString& textToDraw, PRBool
// Most of this code is copied from its svg equivalent
nsRefPtr<gfxFlattenedPath> path(mThebesContext->GetFlattenedPath());
nsCOMPtr<nsINode> elem = do_QueryInterface(mCanvasElement);
NS_ASSERTION(elem, "Canvas element must be an nsINode");
nsCOMPtr<nsIDocument> elemDocument(elem->GetOwnerDoc());
const PRUnichar* textdata;
textToDraw.GetData(&textdata);
PRUint32 textrunflags = 0;
PRUint32 aupdp = elemDocument->GetPrimaryShell()->GetPresContext()->AppUnitsPerDevPixel();
PRUint32 aupdp;
GetAppUnitsValues(&aupdp, NULL);
gfxTextRunCache::AutoTextRun textRun;
textRun = gfxTextRunCache::MakeTextRun(textdata,
@ -1709,7 +1737,7 @@ nsCanvasRenderingContext2D::MozTextAlongPath(const nsAString& textToDraw, PRBool
mThebesContext->SetMatrix(matrix);
}
delete[] cp;
delete [] cp;
return NS_OK;
}
@ -1851,6 +1879,11 @@ nsCanvasRenderingContext2D::DrawImage()
{
nsresult rv;
// we can't do a security check without a canvas element, so
// just skip this entirely
if (!mCanvasElement)
return NS_ERROR_FAILURE;
nsAXPCNativeCallContext *ncc = nsnull;
rv = nsContentUtils::XPConnect()->
GetCurrentNativeCallContext(&ncc);
@ -2360,7 +2393,7 @@ nsCanvasRenderingContext2D::DrawWindow(nsIDOMWindow* aWindow, PRInt32 aX, PRInt3
NS_IMETHODIMP
nsCanvasRenderingContext2D::GetImageData()
{
if (!mValid)
if (!mValid || !mCanvasElement)
return NS_ERROR_FAILURE;
if (mCanvasElement->IsWriteOnly() && !nsContentUtils::IsCallerTrustedForRead()) {