зеркало из https://github.com/mozilla/gecko-dev.git
169 строки
5.8 KiB
C++
169 строки
5.8 KiB
C++
/* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#ifndef nsICanvasRenderingContextInternal_h___
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#define nsICanvasRenderingContextInternal_h___
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#include "mozilla/gfx/2D.h"
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#include "nsISupports.h"
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#include "nsIInputStream.h"
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#include "nsIDocShell.h"
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#include "nsRefreshDriver.h"
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#include "mozilla/dom/HTMLCanvasElement.h"
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#include "GraphicsFilter.h"
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#include "mozilla/RefPtr.h"
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#define NS_ICANVASRENDERINGCONTEXTINTERNAL_IID \
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{ 0x3cc9e801, 0x1806, 0x4ff6, \
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{ 0x86, 0x14, 0xf9, 0xd0, 0xf4, 0xfb, 0x3b, 0x08 } }
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class gfxASurface;
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class nsDisplayListBuilder;
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namespace mozilla {
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namespace layers {
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class CanvasLayer;
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class LayerManager;
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} // namespace layers
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namespace gfx {
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class SourceSurface;
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} // namespace gfx
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} // namespace mozilla
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class nsICanvasRenderingContextInternal :
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public nsISupports,
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public nsAPostRefreshObserver
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{
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public:
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typedef mozilla::layers::CanvasLayer CanvasLayer;
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typedef mozilla::layers::LayerManager LayerManager;
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_ICANVASRENDERINGCONTEXTINTERNAL_IID)
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void SetCanvasElement(mozilla::dom::HTMLCanvasElement* parentCanvas)
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{
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RemovePostRefreshObserver();
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mCanvasElement = parentCanvas;
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AddPostRefreshObserverIfNecessary();
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}
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virtual nsIPresShell *GetPresShell() {
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if (mCanvasElement) {
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return mCanvasElement->OwnerDoc()->GetShell();
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}
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return nullptr;
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}
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void RemovePostRefreshObserver()
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{
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if (mRefreshDriver) {
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mRefreshDriver->RemovePostRefreshObserver(this);
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mRefreshDriver = nullptr;
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}
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}
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void AddPostRefreshObserverIfNecessary()
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{
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if (!GetPresShell() ||
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!GetPresShell()->GetPresContext() ||
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!GetPresShell()->GetPresContext()->RefreshDriver()) {
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return;
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}
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mRefreshDriver = GetPresShell()->GetPresContext()->RefreshDriver();
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mRefreshDriver->AddPostRefreshObserver(this);
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}
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mozilla::dom::HTMLCanvasElement* GetParentObject() const
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{
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return mCanvasElement;
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}
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#ifdef DEBUG
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// Useful for testing
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virtual int32_t GetWidth() const = 0;
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virtual int32_t GetHeight() const = 0;
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#endif
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// Sets the dimensions of the canvas, in pixels. Called
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// whenever the size of the element changes.
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NS_IMETHOD SetDimensions(int32_t width, int32_t height) = 0;
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NS_IMETHOD InitializeWithSurface(nsIDocShell *docShell, gfxASurface *surface, int32_t width, int32_t height) = 0;
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// Creates an image buffer. Returns null on failure.
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virtual void GetImageBuffer(uint8_t** imageBuffer, int32_t* format) = 0;
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// Gives you a stream containing the image represented by this context.
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// The format is given in mimeTime, for example "image/png".
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//
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// If the image format does not support transparency or includeTransparency
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// is false, alpha will be discarded and the result will be the image
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// composited on black.
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NS_IMETHOD GetInputStream(const char *mimeType,
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const char16_t *encoderOptions,
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nsIInputStream **stream) = 0;
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// This gets an Azure SourceSurface for the canvas, this will be a snapshot
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// of the canvas at the time it was called.
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// If premultAlpha is provided, then it assumed the callee can handle
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// un-premultiplied surfaces, and *premultAlpha will be set to false
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// if one is returned.
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virtual already_AddRefed<mozilla::gfx::SourceSurface> GetSurfaceSnapshot(bool* premultAlpha = nullptr) = 0;
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// If this context is opaque, the backing store of the canvas should
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// be created as opaque; all compositing operators should assume the
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// dst alpha is always 1.0. If this is never called, the context
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// defaults to false (not opaque).
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NS_IMETHOD SetIsOpaque(bool isOpaque) = 0;
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virtual bool GetIsOpaque() = 0;
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// Invalidate this context and release any held resources, in preperation
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// for possibly reinitializing with SetDimensions/InitializeWithSurface.
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NS_IMETHOD Reset() = 0;
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// Return the CanvasLayer for this context, creating
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// one for the given layer manager if not available.
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virtual already_AddRefed<CanvasLayer> GetCanvasLayer(nsDisplayListBuilder* builder,
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CanvasLayer *oldLayer,
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LayerManager *manager) = 0;
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// Return true if the canvas should be forced to be "inactive" to ensure
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// it can be drawn to the screen even if it's too large to be blitted by
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// an accelerated CanvasLayer.
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virtual bool ShouldForceInactiveLayer(LayerManager *manager) { return false; }
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virtual void MarkContextClean() = 0;
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// Redraw the dirty rectangle of this canvas.
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NS_IMETHOD Redraw(const gfxRect &dirty) = 0;
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NS_IMETHOD SetContextOptions(JSContext* cx, JS::Handle<JS::Value> options) { return NS_OK; }
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// return true and fills in the bounding rect if elementis a child and has a hit region.
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virtual bool GetHitRegionRect(mozilla::dom::Element* element, nsRect& rect) { return false; }
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// Given a point, return hit region ID if it exists or an empty string if it doesn't
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virtual nsString GetHitRegion(const mozilla::gfx::Point& point) { return nsString(); }
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//
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// shmem support
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//
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// If this context can be set to use Mozilla's Shmem segments as its backing
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// store, this will set it to that state. Note that if you have drawn
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// anything into this canvas before changing the shmem state, it will be
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// lost.
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NS_IMETHOD SetIsIPC(bool isIPC) = 0;
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protected:
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nsRefPtr<mozilla::dom::HTMLCanvasElement> mCanvasElement;
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nsRefPtr<nsRefreshDriver> mRefreshDriver;
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsICanvasRenderingContextInternal,
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NS_ICANVASRENDERINGCONTEXTINTERNAL_IID)
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#endif /* nsICanvasRenderingContextInternal_h___ */
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