mirror of
https://github.com/mozilla/gecko-dev.git
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131 lines
3.3 KiB
C++
131 lines
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <stdlib.h>
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#include <stdarg.h>
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#include "prprf.h"
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#include "nsIServiceManager.h"
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#include "nsIConsoleService.h"
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#include "nsIDOMCanvasRenderingContext2D.h"
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#include "nsICanvasRenderingContextInternal.h"
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#include "nsIHTMLCollection.h"
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#include "mozilla/dom/HTMLCanvasElement.h"
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#include "nsIPrincipal.h"
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#include "nsGfxCIID.h"
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#include "nsTArray.h"
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#include "CanvasUtils.h"
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#include "mozilla/gfx/Matrix.h"
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#include "WebGL2Context.h"
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using namespace mozilla::gfx;
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namespace mozilla {
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namespace CanvasUtils {
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bool
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GetCanvasContextType(const nsAString& str, dom::CanvasContextType* const out_type)
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{
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if (str.EqualsLiteral("2d")) {
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*out_type = dom::CanvasContextType::Canvas2D;
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return true;
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}
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if (str.EqualsLiteral("experimental-webgl")) {
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*out_type = dom::CanvasContextType::WebGL1;
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return true;
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}
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#ifdef MOZ_WEBGL_CONFORMANT
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if (str.EqualsLiteral("webgl")) {
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/* WebGL 1.0, $2.1 "Context Creation":
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* If the user agent supports both the webgl and experimental-webgl
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* canvas context types, they shall be treated as aliases.
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*/
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*out_type = dom::CanvasContextType::WebGL1;
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return true;
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}
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#endif
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if (WebGL2Context::IsSupported()) {
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if (str.EqualsLiteral("webgl2")) {
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*out_type = dom::CanvasContextType::WebGL2;
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return true;
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}
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}
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if (str.EqualsLiteral("bitmaprenderer")) {
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*out_type = dom::CanvasContextType::ImageBitmap;
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return true;
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}
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return false;
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}
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/**
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* This security check utility might be called from an source that never taints
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* others. For example, while painting a CanvasPattern, which is created from an
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* ImageBitmap, onto a canvas. In this case, the caller could set the CORSUsed
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* true in order to pass this check and leave the aPrincipal to be a nullptr
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* since the aPrincipal is not going to be used.
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*/
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void
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DoDrawImageSecurityCheck(dom::HTMLCanvasElement *aCanvasElement,
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nsIPrincipal *aPrincipal,
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bool forceWriteOnly,
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bool CORSUsed)
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{
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// Callers should ensure that mCanvasElement is non-null before calling this
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if (!aCanvasElement) {
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NS_WARNING("DoDrawImageSecurityCheck called without canvas element!");
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return;
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}
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if (aCanvasElement->IsWriteOnly())
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return;
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// If we explicitly set WriteOnly just do it and get out
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if (forceWriteOnly) {
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aCanvasElement->SetWriteOnly();
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return;
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}
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// No need to do a security check if the image used CORS for the load
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if (CORSUsed)
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return;
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NS_PRECONDITION(aPrincipal, "Must have a principal here");
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if (aCanvasElement->NodePrincipal()->Subsumes(aPrincipal)) {
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// This canvas has access to that image anyway
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return;
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}
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aCanvasElement->SetWriteOnly();
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}
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bool
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CoerceDouble(JS::Value v, double* d)
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{
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if (v.isDouble()) {
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*d = v.toDouble();
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} else if (v.isInt32()) {
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*d = double(v.toInt32());
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} else if (v.isUndefined()) {
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*d = 0.0;
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} else {
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return false;
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}
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return true;
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}
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} // namespace CanvasUtils
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} // namespace mozilla
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