1172 lines
38 KiB
C++
1172 lines
38 KiB
C++
/* 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef CanvasRenderingContext2D_h
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#define CanvasRenderingContext2D_h
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#include "mozilla/Attributes.h"
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#include <vector>
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#include "nsIDOMCanvasRenderingContext2D.h"
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#include "nsICanvasRenderingContextInternal.h"
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#include "mozilla/RefPtr.h"
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#include "nsColor.h"
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#include "mozilla/dom/HTMLCanvasElement.h"
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#include "mozilla/dom/HTMLVideoElement.h"
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#include "gfxTextRun.h"
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#include "mozilla/ErrorResult.h"
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#include "mozilla/dom/CanvasGradient.h"
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#include "mozilla/dom/CanvasRenderingContext2DBinding.h"
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#include "mozilla/dom/CanvasPattern.h"
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#include "mozilla/gfx/Rect.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/UniquePtr.h"
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#include "gfx2DGlue.h"
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#include "imgIEncoder.h"
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#include "nsLayoutUtils.h"
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#include "mozilla/EnumeratedArray.h"
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#include "FilterSupport.h"
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#include "nsSVGEffects.h"
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#include "Layers.h"
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class nsGlobalWindow;
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class nsXULElement;
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namespace mozilla {
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namespace gl {
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class SourceSurface;
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} // namespace gl
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namespace dom {
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class HTMLImageElementOrSVGImageElementOrHTMLCanvasElementOrHTMLVideoElementOrImageBitmap;
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typedef HTMLImageElementOrSVGImageElementOrHTMLCanvasElementOrHTMLVideoElementOrImageBitmap CanvasImageSource;
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class ImageBitmap;
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class ImageData;
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class StringOrCanvasGradientOrCanvasPattern;
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class OwningStringOrCanvasGradientOrCanvasPattern;
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class TextMetrics;
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class CanvasFilterChainObserver;
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class CanvasPath;
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extern const mozilla::gfx::Float SIGMA_MAX;
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template<typename T> class Optional;
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struct CanvasBidiProcessor;
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class CanvasRenderingContext2DUserData;
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class CanvasDrawObserver;
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class CanvasShutdownObserver;
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/**
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** CanvasRenderingContext2D
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**/
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class CanvasRenderingContext2D final :
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public nsICanvasRenderingContextInternal,
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public nsWrapperCache
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{
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virtual ~CanvasRenderingContext2D();
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public:
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explicit CanvasRenderingContext2D(layers::LayersBackend aCompositorBackend);
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virtual JSObject* WrapObject(JSContext *aCx, JS::Handle<JSObject*> aGivenProto) override;
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HTMLCanvasElement* GetCanvas() const
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{
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if (!mCanvasElement || mCanvasElement->IsInNativeAnonymousSubtree()) {
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return nullptr;
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}
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// corresponds to changes to the old bindings made in bug 745025
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return mCanvasElement->GetOriginalCanvas();
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}
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void Save();
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void Restore();
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void Scale(double aX, double aY, mozilla::ErrorResult& aError);
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void Rotate(double aAngle, mozilla::ErrorResult& aError);
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void Translate(double aX, double aY, mozilla::ErrorResult& aError);
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void Transform(double aM11, double aM12, double aM21, double aM22, double aDx,
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double aDy, mozilla::ErrorResult& aError);
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void SetTransform(double aM11, double aM12, double aM21, double aM22, double aDx,
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double aDy, mozilla::ErrorResult& aError);
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void ResetTransform(mozilla::ErrorResult& aError);
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double GlobalAlpha()
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{
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return CurrentState().globalAlpha;
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}
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// Useful for silencing cast warnings
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static mozilla::gfx::Float ToFloat(double aValue) { return mozilla::gfx::Float(aValue); }
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void SetGlobalAlpha(double aGlobalAlpha)
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{
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if (aGlobalAlpha >= 0.0 && aGlobalAlpha <= 1.0) {
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CurrentState().globalAlpha = ToFloat(aGlobalAlpha);
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}
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}
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void GetGlobalCompositeOperation(nsAString& aOp, mozilla::ErrorResult& aError);
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void SetGlobalCompositeOperation(const nsAString& aOp,
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mozilla::ErrorResult& aError);
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void GetStrokeStyle(OwningStringOrCanvasGradientOrCanvasPattern& aValue)
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{
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GetStyleAsUnion(aValue, Style::STROKE);
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}
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void SetStrokeStyle(const StringOrCanvasGradientOrCanvasPattern& aValue)
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{
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SetStyleFromUnion(aValue, Style::STROKE);
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}
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void GetFillStyle(OwningStringOrCanvasGradientOrCanvasPattern& aValue)
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{
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GetStyleAsUnion(aValue, Style::FILL);
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}
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void SetFillStyle(const StringOrCanvasGradientOrCanvasPattern& aValue)
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{
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SetStyleFromUnion(aValue, Style::FILL);
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}
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already_AddRefed<CanvasGradient>
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CreateLinearGradient(double aX0, double aY0, double aX1, double aY1);
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already_AddRefed<CanvasGradient>
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CreateRadialGradient(double aX0, double aY0, double aR0, double aX1, double aY1,
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double aR1, ErrorResult& aError);
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already_AddRefed<CanvasPattern>
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CreatePattern(const CanvasImageSource& aElement,
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const nsAString& aRepeat, ErrorResult& aError);
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double ShadowOffsetX()
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{
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return CurrentState().shadowOffset.x;
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}
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void SetShadowOffsetX(double aShadowOffsetX)
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{
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CurrentState().shadowOffset.x = ToFloat(aShadowOffsetX);
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}
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double ShadowOffsetY()
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{
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return CurrentState().shadowOffset.y;
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}
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void SetShadowOffsetY(double aShadowOffsetY)
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{
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CurrentState().shadowOffset.y = ToFloat(aShadowOffsetY);
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}
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double ShadowBlur()
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{
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return CurrentState().shadowBlur;
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}
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void SetShadowBlur(double aShadowBlur)
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{
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if (aShadowBlur >= 0.0) {
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CurrentState().shadowBlur = ToFloat(aShadowBlur);
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}
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}
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void GetShadowColor(nsAString& aShadowColor)
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{
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StyleColorToString(CurrentState().shadowColor, aShadowColor);
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}
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void GetFilter(nsAString& aFilter)
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{
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aFilter = CurrentState().filterString;
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}
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void SetShadowColor(const nsAString& aShadowColor);
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void SetFilter(const nsAString& aFilter, mozilla::ErrorResult& aError);
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void ClearRect(double aX, double aY, double aW, double aH);
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void FillRect(double aX, double aY, double aW, double aH);
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void StrokeRect(double aX, double aY, double aW, double aH);
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void BeginPath();
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void Fill(const CanvasWindingRule& aWinding);
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void Fill(const CanvasPath& aPath, const CanvasWindingRule& aWinding);
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void Stroke();
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void Stroke(const CanvasPath& aPath);
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void DrawFocusIfNeeded(mozilla::dom::Element& aElement, ErrorResult& aRv);
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bool DrawCustomFocusRing(mozilla::dom::Element& aElement);
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void Clip(const CanvasWindingRule& aWinding);
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void Clip(const CanvasPath& aPath, const CanvasWindingRule& aWinding);
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bool IsPointInPath(double aX, double aY, const CanvasWindingRule& aWinding);
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bool IsPointInPath(const CanvasPath& aPath, double aX, double aY, const CanvasWindingRule& aWinding);
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bool IsPointInStroke(double aX, double aY);
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bool IsPointInStroke(const CanvasPath& aPath, double aX, double aY);
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void FillText(const nsAString& aText, double aX, double aY,
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const Optional<double>& aMaxWidth,
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mozilla::ErrorResult& aError);
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void StrokeText(const nsAString& aText, double aX, double aY,
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const Optional<double>& aMaxWidth,
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mozilla::ErrorResult& aError);
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TextMetrics*
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MeasureText(const nsAString& aRawText, mozilla::ErrorResult& aError);
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void AddHitRegion(const HitRegionOptions& aOptions, mozilla::ErrorResult& aError);
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void RemoveHitRegion(const nsAString& aId);
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void ClearHitRegions();
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void DrawImage(const CanvasImageSource& aImage,
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double aDx, double aDy, mozilla::ErrorResult& aError)
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{
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DrawImage(aImage, 0.0, 0.0, 0.0, 0.0, aDx, aDy, 0.0, 0.0, 0, aError);
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}
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void DrawImage(const CanvasImageSource& aImage,
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double aDx, double aDy, double aDw, double aDh,
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mozilla::ErrorResult& aError)
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{
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DrawImage(aImage, 0.0, 0.0, 0.0, 0.0, aDx, aDy, aDw, aDh, 2, aError);
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}
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void DrawImage(const CanvasImageSource& aImage,
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double aSx, double aSy, double aSw, double aSh, double aDx,
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double aDy, double aDw, double aDh, mozilla::ErrorResult& aError)
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{
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DrawImage(aImage, aSx, aSy, aSw, aSh, aDx, aDy, aDw, aDh, 6, aError);
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}
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already_AddRefed<ImageData>
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CreateImageData(JSContext* aCx, double aSw, double aSh,
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mozilla::ErrorResult& aError);
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already_AddRefed<ImageData>
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CreateImageData(JSContext* aCx, ImageData& aImagedata,
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mozilla::ErrorResult& aError);
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already_AddRefed<ImageData>
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GetImageData(JSContext* aCx, double aSx, double aSy, double aSw, double aSh,
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mozilla::ErrorResult& aError);
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void PutImageData(ImageData& aImageData,
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double aDx, double aDy, mozilla::ErrorResult& aError);
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void PutImageData(ImageData& aImageData,
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double aDx, double aDy, double aDirtyX, double aDirtyY,
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double aDirtyWidth, double aDirtyHeight,
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mozilla::ErrorResult& aError);
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double LineWidth()
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{
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return CurrentState().lineWidth;
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}
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void SetLineWidth(double aWidth)
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{
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if (aWidth > 0.0) {
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CurrentState().lineWidth = ToFloat(aWidth);
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}
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}
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void GetLineCap(nsAString& aLinecapStyle);
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void SetLineCap(const nsAString& aLinecapStyle);
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void GetLineJoin(nsAString& aLinejoinStyle, mozilla::ErrorResult& aError);
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void SetLineJoin(const nsAString& aLinejoinStyle);
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double MiterLimit()
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{
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return CurrentState().miterLimit;
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}
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void SetMiterLimit(double aMiter)
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{
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if (aMiter > 0.0) {
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CurrentState().miterLimit = ToFloat(aMiter);
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}
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}
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void GetFont(nsAString& aFont)
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{
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aFont = GetFont();
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}
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void SetFont(const nsAString& aFont, mozilla::ErrorResult& aError);
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void GetTextAlign(nsAString& aTextAlign);
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void SetTextAlign(const nsAString& aTextAlign);
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void GetTextBaseline(nsAString& aTextBaseline);
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void SetTextBaseline(const nsAString& aTextBaseline);
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void ClosePath()
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{
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EnsureWritablePath();
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if (mPathBuilder) {
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mPathBuilder->Close();
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} else {
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mDSPathBuilder->Close();
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}
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}
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void MoveTo(double aX, double aY)
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{
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EnsureWritablePath();
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if (mPathBuilder) {
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mPathBuilder->MoveTo(mozilla::gfx::Point(ToFloat(aX), ToFloat(aY)));
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} else {
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mDSPathBuilder->MoveTo(mTarget->GetTransform().TransformPoint(
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mozilla::gfx::Point(ToFloat(aX), ToFloat(aY))));
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}
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}
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void LineTo(double aX, double aY)
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{
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EnsureWritablePath();
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LineTo(mozilla::gfx::Point(ToFloat(aX), ToFloat(aY)));
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}
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void QuadraticCurveTo(double aCpx, double aCpy, double aX, double aY)
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{
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EnsureWritablePath();
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if (mPathBuilder) {
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mPathBuilder->QuadraticBezierTo(mozilla::gfx::Point(ToFloat(aCpx), ToFloat(aCpy)),
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mozilla::gfx::Point(ToFloat(aX), ToFloat(aY)));
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} else {
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mozilla::gfx::Matrix transform = mTarget->GetTransform();
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mDSPathBuilder->QuadraticBezierTo(transform.TransformPoint(
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mozilla::gfx::Point(ToFloat(aCpx), ToFloat(aCpy))),
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transform.TransformPoint(
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mozilla::gfx::Point(ToFloat(aX), ToFloat(aY))));
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}
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}
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void BezierCurveTo(double aCp1x, double aCp1y, double aCp2x, double aCp2y, double aX, double aY)
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{
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EnsureWritablePath();
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BezierTo(mozilla::gfx::Point(ToFloat(aCp1x), ToFloat(aCp1y)),
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mozilla::gfx::Point(ToFloat(aCp2x), ToFloat(aCp2y)),
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mozilla::gfx::Point(ToFloat(aX), ToFloat(aY)));
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}
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void ArcTo(double aX1, double aY1, double aX2, double aY2, double aRadius,
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mozilla::ErrorResult& aError);
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void Rect(double aX, double aY, double aW, double aH);
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void Arc(double aX, double aY, double aRadius, double aStartAngle,
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double aEndAngle, bool aAnticlockwise, mozilla::ErrorResult& aError);
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void Ellipse(double aX, double aY, double aRadiusX, double aRadiusY,
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double aRotation, double aStartAngle, double aEndAngle,
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bool aAnticlockwise, ErrorResult& aError);
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void GetMozCurrentTransform(JSContext* aCx,
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JS::MutableHandle<JSObject*> aResult,
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mozilla::ErrorResult& aError);
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void SetMozCurrentTransform(JSContext* aCx,
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JS::Handle<JSObject*> aCurrentTransform,
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mozilla::ErrorResult& aError);
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void GetMozCurrentTransformInverse(JSContext* aCx,
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JS::MutableHandle<JSObject*> aResult,
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mozilla::ErrorResult& aError);
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void SetMozCurrentTransformInverse(JSContext* aCx,
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JS::Handle<JSObject*> aCurrentTransform,
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mozilla::ErrorResult& aError);
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void GetFillRule(nsAString& aFillRule);
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void SetFillRule(const nsAString& aFillRule);
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void SetLineDash(const Sequence<double>& aSegments,
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mozilla::ErrorResult& aRv);
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void GetLineDash(nsTArray<double>& aSegments) const;
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void SetLineDashOffset(double aOffset);
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double LineDashOffset() const;
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void GetMozTextStyle(nsAString& aMozTextStyle)
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{
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GetFont(aMozTextStyle);
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}
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void SetMozTextStyle(const nsAString& aMozTextStyle,
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mozilla::ErrorResult& aError)
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{
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SetFont(aMozTextStyle, aError);
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}
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bool ImageSmoothingEnabled()
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{
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return CurrentState().imageSmoothingEnabled;
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}
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void SetImageSmoothingEnabled(bool aImageSmoothingEnabled)
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{
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if (aImageSmoothingEnabled != CurrentState().imageSmoothingEnabled) {
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CurrentState().imageSmoothingEnabled = aImageSmoothingEnabled;
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}
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}
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void DrawWindow(nsGlobalWindow& aWindow, double aX, double aY,
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double aW, double aH,
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const nsAString& aBgColor, uint32_t aFlags,
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mozilla::ErrorResult& aError);
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void AsyncDrawXULElement(nsXULElement& aElem, double aX, double aY, double aW,
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double aH, const nsAString& aBgColor, uint32_t aFlags,
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mozilla::ErrorResult& aError);
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enum RenderingMode {
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SoftwareBackendMode,
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OpenGLBackendMode,
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DefaultBackendMode
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};
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bool SwitchRenderingMode(RenderingMode aRenderingMode);
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// Eventually this should be deprecated. Keeping for now to keep the binding functional.
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void Demote();
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nsresult Redraw();
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virtual int32_t GetWidth() const override;
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virtual int32_t GetHeight() const override;
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gfx::IntSize GetSize() const { return gfx::IntSize(mWidth, mHeight); }
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// nsICanvasRenderingContextInternal
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/**
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* Gets the pres shell from either the canvas element or the doc shell
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*/
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virtual nsIPresShell *GetPresShell() override {
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if (mCanvasElement) {
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return mCanvasElement->OwnerDoc()->GetShell();
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}
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if (mDocShell) {
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return mDocShell->GetPresShell();
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}
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return nullptr;
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}
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NS_IMETHOD SetDimensions(int32_t aWidth, int32_t aHeight) override;
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NS_IMETHOD InitializeWithDrawTarget(nsIDocShell* aShell,
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NotNull<gfx::DrawTarget*> aTarget) override;
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NS_IMETHOD GetInputStream(const char* aMimeType,
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const char16_t* aEncoderOptions,
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nsIInputStream** aStream) override;
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already_AddRefed<mozilla::gfx::SourceSurface> GetSurfaceSnapshot(bool* aPremultAlpha = nullptr) override
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{
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EnsureTarget();
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if (aPremultAlpha) {
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*aPremultAlpha = true;
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}
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return mTarget->Snapshot();
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}
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NS_IMETHOD SetIsOpaque(bool aIsOpaque) override;
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bool GetIsOpaque() override { return mOpaque; }
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NS_IMETHOD Reset() override;
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already_AddRefed<Layer> GetCanvasLayer(nsDisplayListBuilder* aBuilder,
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Layer* aOldLayer,
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LayerManager* aManager,
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bool aMirror = false) override;
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virtual bool ShouldForceInactiveLayer(LayerManager* aManager) override;
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void MarkContextClean() override;
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void MarkContextCleanForFrameCapture() override;
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bool IsContextCleanForFrameCapture() override;
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NS_IMETHOD SetIsIPC(bool aIsIPC) override;
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// this rect is in canvas device space
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void Redraw(const mozilla::gfx::Rect& aR);
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NS_IMETHOD Redraw(const gfxRect& aR) override { Redraw(ToRect(aR)); return NS_OK; }
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NS_IMETHOD SetContextOptions(JSContext* aCx,
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JS::Handle<JS::Value> aOptions,
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ErrorResult& aRvForDictionaryInit) override;
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/**
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* An abstract base class to be implemented by callers wanting to be notified
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* that a refresh has occurred. Callers must ensure an observer is removed
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* before it is destroyed.
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*/
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virtual void DidRefresh() override;
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// this rect is in mTarget's current user space
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void RedrawUser(const gfxRect& aR);
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// nsISupports interface + CC
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS(CanvasRenderingContext2D)
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enum class CanvasMultiGetterType : uint8_t {
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|
STRING = 0,
|
|
PATTERN = 1,
|
|
GRADIENT = 2
|
|
};
|
|
|
|
enum class Style : uint8_t {
|
|
STROKE = 0,
|
|
FILL,
|
|
MAX
|
|
};
|
|
|
|
nsINode* GetParentObject()
|
|
{
|
|
return mCanvasElement;
|
|
}
|
|
|
|
void LineTo(const mozilla::gfx::Point& aPoint)
|
|
{
|
|
if (mPathBuilder) {
|
|
mPathBuilder->LineTo(aPoint);
|
|
} else {
|
|
mDSPathBuilder->LineTo(mTarget->GetTransform().TransformPoint(aPoint));
|
|
}
|
|
}
|
|
|
|
void BezierTo(const mozilla::gfx::Point& aCP1,
|
|
const mozilla::gfx::Point& aCP2,
|
|
const mozilla::gfx::Point& aCP3)
|
|
{
|
|
if (mPathBuilder) {
|
|
mPathBuilder->BezierTo(aCP1, aCP2, aCP3);
|
|
} else {
|
|
mozilla::gfx::Matrix transform = mTarget->GetTransform();
|
|
mDSPathBuilder->BezierTo(transform.TransformPoint(aCP1),
|
|
transform.TransformPoint(aCP2),
|
|
transform.TransformPoint(aCP3));
|
|
}
|
|
}
|
|
|
|
friend class CanvasRenderingContext2DUserData;
|
|
|
|
virtual UniquePtr<uint8_t[]> GetImageBuffer(int32_t* aFormat) override;
|
|
|
|
|
|
// Given a point, return hit region ID if it exists
|
|
nsString GetHitRegion(const mozilla::gfx::Point& aPoint) override;
|
|
|
|
|
|
// return true and fills in the bound rect if element has a hit region.
|
|
bool GetHitRegionRect(Element* aElement, nsRect& aRect) override;
|
|
|
|
void OnShutdown();
|
|
|
|
// Check the global setup, as well as the compositor type:
|
|
bool AllowOpenGLCanvas() const;
|
|
|
|
protected:
|
|
nsresult GetImageDataArray(JSContext* aCx, int32_t aX, int32_t aY,
|
|
uint32_t aWidth, uint32_t aHeight,
|
|
JSObject** aRetval);
|
|
|
|
nsresult PutImageData_explicit(int32_t aX, int32_t aY, uint32_t aW, uint32_t aH,
|
|
dom::Uint8ClampedArray* aArray,
|
|
bool aHasDirtyRect, int32_t aDirtyX, int32_t aDirtyY,
|
|
int32_t aDirtyWidth, int32_t aDirtyHeight);
|
|
|
|
/**
|
|
* Internal method to complete initialisation, expects mTarget to have been set
|
|
*/
|
|
nsresult Initialize(int32_t aWidth, int32_t aHeight);
|
|
|
|
nsresult InitializeWithTarget(mozilla::gfx::DrawTarget* aSurface,
|
|
int32_t aWidth, int32_t aHeight);
|
|
|
|
/**
|
|
* The number of living nsCanvasRenderingContexts. When this goes down to
|
|
* 0, we free the premultiply and unpremultiply tables, if they exist.
|
|
*/
|
|
static uintptr_t sNumLivingContexts;
|
|
|
|
static mozilla::gfx::DrawTarget* sErrorTarget;
|
|
|
|
void SetTransformInternal(const mozilla::gfx::Matrix& aTransform);
|
|
|
|
// Some helpers. Doesn't modify a color on failure.
|
|
void SetStyleFromUnion(const StringOrCanvasGradientOrCanvasPattern& aValue,
|
|
Style aWhichStyle);
|
|
void SetStyleFromString(const nsAString& aStr, Style aWhichStyle);
|
|
|
|
void SetStyleFromGradient(CanvasGradient& aGradient, Style aWhichStyle)
|
|
{
|
|
CurrentState().SetGradientStyle(aWhichStyle, &aGradient);
|
|
}
|
|
|
|
void SetStyleFromPattern(CanvasPattern& aPattern, Style aWhichStyle)
|
|
{
|
|
CurrentState().SetPatternStyle(aWhichStyle, &aPattern);
|
|
}
|
|
|
|
void GetStyleAsUnion(OwningStringOrCanvasGradientOrCanvasPattern& aValue,
|
|
Style aWhichStyle);
|
|
|
|
// Returns whether a color was successfully parsed.
|
|
bool ParseColor(const nsAString& aString, nscolor* aColor);
|
|
|
|
static void StyleColorToString(const nscolor& aColor, nsAString& aStr);
|
|
|
|
// Returns whether a filter was successfully parsed.
|
|
bool ParseFilter(const nsAString& aString,
|
|
nsTArray<nsStyleFilter>& aFilterChain,
|
|
ErrorResult& aError);
|
|
|
|
// Returns whether the font was successfully updated.
|
|
bool SetFontInternal(const nsAString& aFont, mozilla::ErrorResult& aError);
|
|
|
|
|
|
/**
|
|
* Creates the error target, if it doesn't exist
|
|
*/
|
|
static void EnsureErrorTarget();
|
|
|
|
/* This function ensures there is a writable pathbuilder available, this
|
|
* pathbuilder may be working in user space or in device space or
|
|
* device space.
|
|
* After calling this function mPathTransformWillUpdate will be false
|
|
*/
|
|
void EnsureWritablePath();
|
|
|
|
// Ensures a path in UserSpace is available.
|
|
void EnsureUserSpacePath(const CanvasWindingRule& aWinding = CanvasWindingRule::Nonzero);
|
|
|
|
/**
|
|
* Needs to be called before updating the transform. This makes a call to
|
|
* EnsureTarget() so you don't have to.
|
|
*/
|
|
void TransformWillUpdate();
|
|
|
|
// Report the fillRule has changed.
|
|
void FillRuleChanged();
|
|
|
|
/**
|
|
* Create the backing surfacing, if it doesn't exist. If there is an error
|
|
* in creating the target then it will put sErrorTarget in place. If there
|
|
* is in turn an error in creating the sErrorTarget then they would both
|
|
* be null so IsTargetValid() would still return null.
|
|
*
|
|
* Returns the actual rendering mode being used by the created target.
|
|
*/
|
|
RenderingMode EnsureTarget(const gfx::Rect* aCoveredRect = nullptr,
|
|
RenderingMode aRenderMode = RenderingMode::DefaultBackendMode);
|
|
|
|
void RestoreClipsAndTransformToTarget();
|
|
|
|
bool TrySkiaGLTarget(RefPtr<gfx::DrawTarget>& aOutDT,
|
|
RefPtr<layers::PersistentBufferProvider>& aOutProvider);
|
|
|
|
bool TrySharedTarget(RefPtr<gfx::DrawTarget>& aOutDT,
|
|
RefPtr<layers::PersistentBufferProvider>& aOutProvider);
|
|
|
|
bool TryBasicTarget(RefPtr<gfx::DrawTarget>& aOutDT,
|
|
RefPtr<layers::PersistentBufferProvider>& aOutProvider);
|
|
|
|
void RegisterAllocation();
|
|
|
|
void SetInitialState();
|
|
|
|
void SetErrorState();
|
|
|
|
/**
|
|
* This method is run at the end of the event-loop spin where
|
|
* ScheduleStableStateCallback was called.
|
|
*
|
|
* We use it to unlock resources that need to be locked while drawing.
|
|
*/
|
|
void OnStableState();
|
|
|
|
/**
|
|
* Cf. OnStableState.
|
|
*/
|
|
void ScheduleStableStateCallback();
|
|
|
|
/**
|
|
* Disposes an old target and prepares to lazily create a new target.
|
|
*
|
|
* Parameters are the new dimensions to be used, or if either is negative,
|
|
* existing dimensions will be left unchanged.
|
|
*/
|
|
void ClearTarget(int32_t aWidth = -1, int32_t aHeight = -1);
|
|
|
|
/*
|
|
* Returns the target to the buffer provider. i.e. this will queue a frame for
|
|
* rendering.
|
|
*/
|
|
void ReturnTarget(bool aForceReset = false);
|
|
|
|
/**
|
|
* Check if the target is valid after calling EnsureTarget.
|
|
*/
|
|
bool IsTargetValid() const {
|
|
return (sErrorTarget == nullptr || mTarget != sErrorTarget) && (mBufferProvider != nullptr || mTarget);
|
|
}
|
|
|
|
/**
|
|
* Returns the surface format this canvas should be allocated using. Takes
|
|
* into account mOpaque, platform requirements, etc.
|
|
*/
|
|
mozilla::gfx::SurfaceFormat GetSurfaceFormat() const;
|
|
|
|
/**
|
|
* Returns true if we know for sure that the pattern for a given style is opaque.
|
|
* Usefull to know if we can discard the content below in certain situations.
|
|
*/
|
|
bool PatternIsOpaque(Style aStyle) const;
|
|
|
|
/**
|
|
* Update CurrentState().filter with the filter description for
|
|
* CurrentState().filterChain.
|
|
* Flushes the PresShell, so the world can change if you call this function.
|
|
*/
|
|
void UpdateFilter();
|
|
|
|
nsLayoutUtils::SurfaceFromElementResult
|
|
CachedSurfaceFromElement(Element* aElement);
|
|
|
|
void DrawImage(const CanvasImageSource& aImgElt,
|
|
double aSx, double aSy, double aSw, double aSh,
|
|
double aDx, double aDy, double aDw, double aDh,
|
|
uint8_t aOptional_argc, mozilla::ErrorResult& aError);
|
|
|
|
void DrawDirectlyToCanvas(const nsLayoutUtils::DirectDrawInfo& aImage,
|
|
mozilla::gfx::Rect* aBounds,
|
|
mozilla::gfx::Rect aDest,
|
|
mozilla::gfx::Rect aSrc,
|
|
gfx::IntSize aImgSize);
|
|
|
|
nsString& GetFont()
|
|
{
|
|
/* will initilize the value if not set, else does nothing */
|
|
GetCurrentFontStyle();
|
|
|
|
return CurrentState().font;
|
|
}
|
|
|
|
// This function maintains a list of raw pointers to cycle-collected
|
|
// objects. We need to ensure that no entries persist beyond unlink,
|
|
// since the objects are logically destructed at that point.
|
|
static std::vector<CanvasRenderingContext2D*>& DemotableContexts();
|
|
static void DemoteOldestContextIfNecessary();
|
|
|
|
static void AddDemotableContext(CanvasRenderingContext2D* aContext);
|
|
static void RemoveDemotableContext(CanvasRenderingContext2D* aContext);
|
|
|
|
RenderingMode mRenderingMode;
|
|
|
|
layers::LayersBackend mCompositorBackend;
|
|
|
|
// Member vars
|
|
int32_t mWidth, mHeight;
|
|
|
|
// This is true when the canvas is valid, but of zero size, this requires
|
|
// specific behavior on some operations.
|
|
bool mZero;
|
|
|
|
bool mOpaque;
|
|
|
|
// This is true when the next time our layer is retrieved we need to
|
|
// recreate it (i.e. our backing surface changed)
|
|
bool mResetLayer;
|
|
// This is needed for drawing in drawAsyncXULElement
|
|
bool mIPC;
|
|
// True if the current DrawTarget is using skia-gl, used so we can avoid
|
|
// requesting the DT from mBufferProvider to check.
|
|
bool mIsSkiaGL;
|
|
|
|
bool mHasPendingStableStateCallback;
|
|
|
|
nsTArray<CanvasRenderingContext2DUserData*> mUserDatas;
|
|
|
|
// If mCanvasElement is not provided, then a docshell is
|
|
nsCOMPtr<nsIDocShell> mDocShell;
|
|
|
|
// This is created lazily so it is necessary to call EnsureTarget before
|
|
// accessing it. In the event of an error it will be equal to
|
|
// sErrorTarget.
|
|
RefPtr<mozilla::gfx::DrawTarget> mTarget;
|
|
|
|
RefPtr<mozilla::layers::PersistentBufferProvider> mBufferProvider;
|
|
|
|
uint32_t SkiaGLTex() const;
|
|
|
|
// This observes our draw calls at the beginning of the canvas
|
|
// lifetime and switches to software or GPU mode depending on
|
|
// what it thinks is best
|
|
CanvasDrawObserver* mDrawObserver;
|
|
void RemoveDrawObserver();
|
|
|
|
RefPtr<CanvasShutdownObserver> mShutdownObserver;
|
|
void RemoveShutdownObserver();
|
|
bool AlreadyShutDown() const { return !mShutdownObserver; }
|
|
|
|
/**
|
|
* Flag to avoid duplicate calls to InvalidateFrame. Set to true whenever
|
|
* Redraw is called, reset to false when Render is called.
|
|
*/
|
|
bool mIsEntireFrameInvalid;
|
|
/**
|
|
* When this is set, the first call to Redraw(gfxRect) should set
|
|
* mIsEntireFrameInvalid since we expect it will be followed by
|
|
* many more Redraw calls.
|
|
*/
|
|
bool mPredictManyRedrawCalls;
|
|
|
|
/**
|
|
* Flag to avoid unnecessary surface copies to FrameCaptureListeners in the
|
|
* case when the canvas is not currently being drawn into and not rendered
|
|
* but canvas capturing is still ongoing.
|
|
*/
|
|
bool mIsCapturedFrameInvalid;
|
|
|
|
/**
|
|
* We also have a device space pathbuilder. The reason for this is as
|
|
* follows, when a path is being built, but the transform changes, we
|
|
* can no longer keep a single path in userspace, considering there's
|
|
* several 'user spaces' now. We therefore transform the current path
|
|
* into device space, and add all operations to this path in device
|
|
* space.
|
|
*
|
|
* When then finally executing a render, the Azure drawing API expects
|
|
* the path to be in userspace. We could then set an identity transform
|
|
* on the DrawTarget and do all drawing in device space. This is
|
|
* undesirable because it requires transforming patterns, gradients,
|
|
* clips, etc. into device space and it would not work for stroking.
|
|
* What we do instead is convert the path back to user space when it is
|
|
* drawn, and draw it with the current transform. This makes all drawing
|
|
* occur correctly.
|
|
*
|
|
* There's never both a device space path builder and a user space path
|
|
* builder present at the same time. There is also never a path and a
|
|
* path builder present at the same time. When writing proceeds on an
|
|
* existing path the Path is cleared and a new builder is created.
|
|
*
|
|
* mPath is always in user-space.
|
|
*/
|
|
RefPtr<mozilla::gfx::Path> mPath;
|
|
RefPtr<mozilla::gfx::PathBuilder> mDSPathBuilder;
|
|
RefPtr<mozilla::gfx::PathBuilder> mPathBuilder;
|
|
bool mPathTransformWillUpdate;
|
|
mozilla::gfx::Matrix mPathToDS;
|
|
|
|
/**
|
|
* Number of times we've invalidated before calling redraw
|
|
*/
|
|
uint32_t mInvalidateCount;
|
|
static const uint32_t kCanvasMaxInvalidateCount = 100;
|
|
|
|
/**
|
|
* State information for hit regions
|
|
*/
|
|
struct RegionInfo
|
|
{
|
|
nsString mId;
|
|
// fallback element for a11y
|
|
RefPtr<Element> mElement;
|
|
// Path of the hit region in the 2d context coordinate space (not user space)
|
|
RefPtr<gfx::Path> mPath;
|
|
};
|
|
|
|
nsTArray<RegionInfo> mHitRegionsOptions;
|
|
|
|
/**
|
|
* Returns true if a shadow should be drawn along with a
|
|
* drawing operation.
|
|
*/
|
|
bool NeedToDrawShadow()
|
|
{
|
|
const ContextState& state = CurrentState();
|
|
|
|
// The spec says we should not draw shadows if the operator is OVER.
|
|
// If it's over and the alpha value is zero, nothing needs to be drawn.
|
|
return NS_GET_A(state.shadowColor) != 0 &&
|
|
(state.shadowBlur != 0.f || state.shadowOffset.x != 0.f || state.shadowOffset.y != 0.f);
|
|
}
|
|
|
|
/**
|
|
* Returns true if the result of a drawing operation should be
|
|
* drawn with a filter.
|
|
*/
|
|
bool NeedToApplyFilter()
|
|
{
|
|
return EnsureUpdatedFilter().mPrimitives.Length() > 0;
|
|
}
|
|
|
|
/**
|
|
* Calls UpdateFilter if the canvas's WriteOnly state has changed between the
|
|
* last call to UpdateFilter and now.
|
|
*/
|
|
const gfx::FilterDescription& EnsureUpdatedFilter() {
|
|
bool isWriteOnly = mCanvasElement && mCanvasElement->IsWriteOnly();
|
|
if (CurrentState().filterSourceGraphicTainted != isWriteOnly) {
|
|
UpdateFilter();
|
|
EnsureTarget();
|
|
}
|
|
MOZ_ASSERT(CurrentState().filterSourceGraphicTainted == isWriteOnly);
|
|
return CurrentState().filter;
|
|
}
|
|
|
|
bool NeedToCalculateBounds()
|
|
{
|
|
return NeedToDrawShadow() || NeedToApplyFilter();
|
|
}
|
|
|
|
mozilla::gfx::CompositionOp UsedOperation()
|
|
{
|
|
if (NeedToDrawShadow() || NeedToApplyFilter()) {
|
|
// In this case the shadow or filter rendering will use the operator.
|
|
return mozilla::gfx::CompositionOp::OP_OVER;
|
|
}
|
|
|
|
return CurrentState().op;
|
|
}
|
|
|
|
// text
|
|
|
|
protected:
|
|
enum class TextAlign : uint8_t {
|
|
START,
|
|
END,
|
|
LEFT,
|
|
RIGHT,
|
|
CENTER
|
|
};
|
|
|
|
enum class TextBaseline : uint8_t {
|
|
TOP,
|
|
HANGING,
|
|
MIDDLE,
|
|
ALPHABETIC,
|
|
IDEOGRAPHIC,
|
|
BOTTOM
|
|
};
|
|
|
|
enum class TextDrawOperation : uint8_t {
|
|
FILL,
|
|
STROKE,
|
|
MEASURE
|
|
};
|
|
|
|
protected:
|
|
gfxFontGroup *GetCurrentFontStyle();
|
|
|
|
/**
|
|
* Implementation of the fillText, strokeText, and measure functions with
|
|
* the operation abstracted to a flag.
|
|
*/
|
|
nsresult DrawOrMeasureText(const nsAString& aText,
|
|
float aX,
|
|
float aY,
|
|
const Optional<double>& aMaxWidth,
|
|
TextDrawOperation aOp,
|
|
float* aWidth);
|
|
|
|
bool CheckSizeForSkiaGL(mozilla::gfx::IntSize aSize);
|
|
|
|
// A clip or a transform, recorded and restored in order.
|
|
struct ClipState {
|
|
explicit ClipState(mozilla::gfx::Path* aClip)
|
|
: clip(aClip)
|
|
{}
|
|
|
|
explicit ClipState(const mozilla::gfx::Matrix& aTransform)
|
|
: transform(aTransform)
|
|
{}
|
|
|
|
bool IsClip() const { return !!clip; }
|
|
|
|
RefPtr<mozilla::gfx::Path> clip;
|
|
mozilla::gfx::Matrix transform;
|
|
};
|
|
|
|
// state stack handling
|
|
class ContextState {
|
|
public:
|
|
ContextState() : textAlign(TextAlign::START),
|
|
textBaseline(TextBaseline::ALPHABETIC),
|
|
shadowColor(0),
|
|
lineWidth(1.0f),
|
|
miterLimit(10.0f),
|
|
globalAlpha(1.0f),
|
|
shadowBlur(0.0),
|
|
dashOffset(0.0f),
|
|
op(mozilla::gfx::CompositionOp::OP_OVER),
|
|
fillRule(mozilla::gfx::FillRule::FILL_WINDING),
|
|
lineCap(mozilla::gfx::CapStyle::BUTT),
|
|
lineJoin(mozilla::gfx::JoinStyle::MITER_OR_BEVEL),
|
|
filterString(u"none"),
|
|
filterSourceGraphicTainted(false),
|
|
imageSmoothingEnabled(true),
|
|
fontExplicitLanguage(false)
|
|
{ }
|
|
|
|
ContextState(const ContextState& aOther)
|
|
: fontGroup(aOther.fontGroup),
|
|
fontLanguage(aOther.fontLanguage),
|
|
fontFont(aOther.fontFont),
|
|
gradientStyles(aOther.gradientStyles),
|
|
patternStyles(aOther.patternStyles),
|
|
colorStyles(aOther.colorStyles),
|
|
font(aOther.font),
|
|
textAlign(aOther.textAlign),
|
|
textBaseline(aOther.textBaseline),
|
|
shadowColor(aOther.shadowColor),
|
|
transform(aOther.transform),
|
|
shadowOffset(aOther.shadowOffset),
|
|
lineWidth(aOther.lineWidth),
|
|
miterLimit(aOther.miterLimit),
|
|
globalAlpha(aOther.globalAlpha),
|
|
shadowBlur(aOther.shadowBlur),
|
|
dash(aOther.dash),
|
|
dashOffset(aOther.dashOffset),
|
|
op(aOther.op),
|
|
fillRule(aOther.fillRule),
|
|
lineCap(aOther.lineCap),
|
|
lineJoin(aOther.lineJoin),
|
|
filterString(aOther.filterString),
|
|
filterChain(aOther.filterChain),
|
|
filterChainObserver(aOther.filterChainObserver),
|
|
filter(aOther.filter),
|
|
filterAdditionalImages(aOther.filterAdditionalImages),
|
|
filterSourceGraphicTainted(aOther.filterSourceGraphicTainted),
|
|
imageSmoothingEnabled(aOther.imageSmoothingEnabled),
|
|
fontExplicitLanguage(aOther.fontExplicitLanguage)
|
|
{ }
|
|
|
|
void SetColorStyle(Style aWhichStyle, nscolor aColor)
|
|
{
|
|
colorStyles[aWhichStyle] = aColor;
|
|
gradientStyles[aWhichStyle] = nullptr;
|
|
patternStyles[aWhichStyle] = nullptr;
|
|
}
|
|
|
|
void SetPatternStyle(Style aWhichStyle, CanvasPattern* aPat)
|
|
{
|
|
gradientStyles[aWhichStyle] = nullptr;
|
|
patternStyles[aWhichStyle] = aPat;
|
|
}
|
|
|
|
void SetGradientStyle(Style aWhichStyle, CanvasGradient* aGrad)
|
|
{
|
|
gradientStyles[aWhichStyle] = aGrad;
|
|
patternStyles[aWhichStyle] = nullptr;
|
|
}
|
|
|
|
/**
|
|
* returns true iff the given style is a solid color.
|
|
*/
|
|
bool StyleIsColor(Style aWhichStyle) const
|
|
{
|
|
return !(patternStyles[aWhichStyle] || gradientStyles[aWhichStyle]);
|
|
}
|
|
|
|
int32_t ShadowBlurRadius() const
|
|
{
|
|
static const gfxFloat GAUSSIAN_SCALE_FACTOR = (3 * sqrt(2 * M_PI) / 4) * 1.5;
|
|
return (int32_t)floor(ShadowBlurSigma() * GAUSSIAN_SCALE_FACTOR + 0.5);
|
|
}
|
|
|
|
mozilla::gfx::Float ShadowBlurSigma() const
|
|
{
|
|
return std::min(SIGMA_MAX, shadowBlur / 2.0f);
|
|
}
|
|
|
|
nsTArray<ClipState> clipsAndTransforms;
|
|
|
|
RefPtr<gfxFontGroup> fontGroup;
|
|
nsCOMPtr<nsIAtom> fontLanguage;
|
|
nsFont fontFont;
|
|
|
|
EnumeratedArray<Style, Style::MAX, RefPtr<CanvasGradient>> gradientStyles;
|
|
EnumeratedArray<Style, Style::MAX, RefPtr<CanvasPattern>> patternStyles;
|
|
EnumeratedArray<Style, Style::MAX, nscolor> colorStyles;
|
|
|
|
nsString font;
|
|
TextAlign textAlign;
|
|
TextBaseline textBaseline;
|
|
|
|
nscolor shadowColor;
|
|
|
|
mozilla::gfx::Matrix transform;
|
|
mozilla::gfx::Point shadowOffset;
|
|
mozilla::gfx::Float lineWidth;
|
|
mozilla::gfx::Float miterLimit;
|
|
mozilla::gfx::Float globalAlpha;
|
|
mozilla::gfx::Float shadowBlur;
|
|
nsTArray<mozilla::gfx::Float> dash;
|
|
mozilla::gfx::Float dashOffset;
|
|
|
|
mozilla::gfx::CompositionOp op;
|
|
mozilla::gfx::FillRule fillRule;
|
|
mozilla::gfx::CapStyle lineCap;
|
|
mozilla::gfx::JoinStyle lineJoin;
|
|
|
|
nsString filterString;
|
|
nsTArray<nsStyleFilter> filterChain;
|
|
RefPtr<nsSVGFilterChainObserver> filterChainObserver;
|
|
mozilla::gfx::FilterDescription filter;
|
|
nsTArray<RefPtr<mozilla::gfx::SourceSurface>> filterAdditionalImages;
|
|
|
|
// This keeps track of whether the canvas was "tainted" or not when
|
|
// we last used a filter. This is a security measure, whereby the
|
|
// canvas is flipped to write-only if a cross-origin image is drawn to it.
|
|
// This is to stop bad actors from reading back data they shouldn't have
|
|
// access to.
|
|
//
|
|
// This also limits what filters we can apply to the context; in particular
|
|
// feDisplacementMap is restricted.
|
|
//
|
|
// We keep track of this to ensure that if this gets out of sync with the
|
|
// tainted state of the canvas itself, we update our filters accordingly.
|
|
bool filterSourceGraphicTainted;
|
|
|
|
bool imageSmoothingEnabled;
|
|
bool fontExplicitLanguage;
|
|
};
|
|
|
|
AutoTArray<ContextState, 3> mStyleStack;
|
|
|
|
inline ContextState& CurrentState() {
|
|
return mStyleStack[mStyleStack.Length() - 1];
|
|
}
|
|
|
|
inline const ContextState& CurrentState() const {
|
|
return mStyleStack[mStyleStack.Length() - 1];
|
|
}
|
|
|
|
friend class CanvasGeneralPattern;
|
|
friend class CanvasFilterChainObserver;
|
|
friend class AdjustedTarget;
|
|
friend class AdjustedTargetForShadow;
|
|
friend class AdjustedTargetForFilter;
|
|
|
|
// other helpers
|
|
void GetAppUnitsValues(int32_t* aPerDevPixel, int32_t* aPerCSSPixel)
|
|
{
|
|
// If we don't have a canvas element, we just return something generic.
|
|
int32_t devPixel = 60;
|
|
int32_t cssPixel = 60;
|
|
|
|
nsIPresShell *ps = GetPresShell();
|
|
nsPresContext *pc;
|
|
|
|
if (!ps) goto FINISH;
|
|
pc = ps->GetPresContext();
|
|
if (!pc) goto FINISH;
|
|
devPixel = pc->AppUnitsPerDevPixel();
|
|
cssPixel = pc->AppUnitsPerCSSPixel();
|
|
|
|
FINISH:
|
|
if (aPerDevPixel)
|
|
*aPerDevPixel = devPixel;
|
|
if (aPerCSSPixel)
|
|
*aPerCSSPixel = cssPixel;
|
|
}
|
|
|
|
friend struct CanvasBidiProcessor;
|
|
friend class CanvasDrawObserver;
|
|
friend class ImageBitmap;
|
|
|
|
// For the origin-clean algorithm (mWriteOnly == !origin-clean)
|
|
// See https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html
|
|
void SetWriteOnly();
|
|
|
|
bool IsWriteOnly() const {
|
|
return mWriteOnly;
|
|
}
|
|
|
|
bool mWriteOnly;
|
|
};
|
|
|
|
} // namespace dom
|
|
} // namespace mozilla
|
|
|
|
#endif /* CanvasRenderingContext2D_h */
|