gecko/content/canvas/public/nsICanvasRenderingContextInternal.h

138 lines
4.7 KiB
C++

/* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
#ifndef nsICanvasRenderingContextInternal_h___
#define nsICanvasRenderingContextInternal_h___
#include "nsISupports.h"
#include "nsIInputStream.h"
#include "nsIDocShell.h"
#include "mozilla/dom/HTMLCanvasElement.h"
#include "gfxPattern.h"
#include "mozilla/RefPtr.h"
#define NS_ICANVASRENDERINGCONTEXTINTERNAL_IID \
{ 0x8b8da863, 0xd151, 0x4014, \
{ 0x8b, 0xdc, 0x62, 0xb5, 0x0d, 0xc0, 0x2b, 0x62 } }
class gfxContext;
class gfxASurface;
class nsDisplayListBuilder;
namespace mozilla {
namespace layers {
class CanvasLayer;
class LayerManager;
}
namespace ipc {
class Shmem;
}
namespace gfx {
class SourceSurface;
}
}
class nsICanvasRenderingContextInternal : public nsISupports {
public:
typedef mozilla::layers::CanvasLayer CanvasLayer;
typedef mozilla::layers::LayerManager LayerManager;
NS_DECLARE_STATIC_IID_ACCESSOR(NS_ICANVASRENDERINGCONTEXTINTERNAL_IID)
enum {
RenderFlagPremultAlpha = 0x1
};
void SetCanvasElement(mozilla::dom::HTMLCanvasElement* aParentCanvas)
{
mCanvasElement = aParentCanvas;
}
mozilla::dom::HTMLCanvasElement* GetParentObject() const
{
return mCanvasElement;
}
// Sets the dimensions of the canvas, in pixels. Called
// whenever the size of the element changes.
NS_IMETHOD SetDimensions(int32_t width, int32_t height) = 0;
NS_IMETHOD InitializeWithSurface(nsIDocShell *docShell, gfxASurface *surface, int32_t width, int32_t height) = 0;
// Render the canvas at the origin of the given gfxContext
NS_IMETHOD Render(gfxContext *ctx,
gfxPattern::GraphicsFilter aFilter,
uint32_t aFlags = RenderFlagPremultAlpha) = 0;
// Gives you a stream containing the image represented by this context.
// The format is given in aMimeTime, for example "image/png".
//
// If the image format does not support transparency or aIncludeTransparency
// is false, alpha will be discarded and the result will be the image
// composited on black.
NS_IMETHOD GetInputStream(const char *aMimeType,
const PRUnichar *aEncoderOptions,
nsIInputStream **aStream) = 0;
// If this canvas context can be represented with a simple Thebes surface,
// return the surface. Otherwise returns an error.
NS_IMETHOD GetThebesSurface(gfxASurface **surface) = 0;
// This gets an Azure SourceSurface for the canvas, this will be a snapshot
// of the canvas at the time it was called.
virtual mozilla::TemporaryRef<mozilla::gfx::SourceSurface> GetSurfaceSnapshot() = 0;
// If this context is opaque, the backing store of the canvas should
// be created as opaque; all compositing operators should assume the
// dst alpha is always 1.0. If this is never called, the context
// defaults to false (not opaque).
NS_IMETHOD SetIsOpaque(bool isOpaque) = 0;
// Invalidate this context and release any held resources, in preperation
// for possibly reinitializing with SetDimensions/InitializeWithSurface.
NS_IMETHOD Reset() = 0;
// Return the CanvasLayer for this context, creating
// one for the given layer manager if not available.
virtual already_AddRefed<CanvasLayer> GetCanvasLayer(nsDisplayListBuilder* aBuilder,
CanvasLayer *aOldLayer,
LayerManager *aManager) = 0;
// Return true if the canvas should be forced to be "inactive" to ensure
// it can be drawn to the screen even if it's too large to be blitted by
// an accelerated CanvasLayer.
virtual bool ShouldForceInactiveLayer(LayerManager *aManager) { return false; }
virtual void MarkContextClean() = 0;
// Redraw the dirty rectangle of this canvas.
NS_IMETHOD Redraw(const gfxRect &dirty) = 0;
NS_IMETHOD SetContextOptions(JSContext* aCx, JS::Handle<JS::Value> aOptions) { return NS_OK; }
//
// shmem support
//
// If this context can be set to use Mozilla's Shmem segments as its backing
// store, this will set it to that state. Note that if you have drawn
// anything into this canvas before changing the shmem state, it will be
// lost.
NS_IMETHOD SetIsIPC(bool isIPC) = 0;
protected:
nsRefPtr<mozilla::dom::HTMLCanvasElement> mCanvasElement;
};
namespace mozilla {
namespace dom {
}
}
NS_DEFINE_STATIC_IID_ACCESSOR(nsICanvasRenderingContextInternal,
NS_ICANVASRENDERINGCONTEXTINTERNAL_IID)
#endif /* nsICanvasRenderingContextInternal_h___ */