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142 lines
4.5 KiB
C++
142 lines
4.5 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Corporation code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Karl Tomlinson <karlt+@karlt.net>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "gfxCachedTempSurface.h"
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#include "gfxContext.h"
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class CachedSurfaceExpirationTracker :
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public nsExpirationTracker<gfxCachedTempSurface,2> {
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public:
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// With K = 2, this means that surfaces will be released when they are not
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// used for 1-2 seconds.
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enum { TIMEOUT_MS = 1000 };
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CachedSurfaceExpirationTracker()
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: nsExpirationTracker<gfxCachedTempSurface,2>(TIMEOUT_MS) {}
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~CachedSurfaceExpirationTracker() {
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AgeAllGenerations();
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}
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virtual void NotifyExpired(gfxCachedTempSurface* aSurface) {
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RemoveObject(aSurface);
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aSurface->Expire();
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}
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static void MarkSurfaceUsed(gfxCachedTempSurface* aSurface)
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{
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if (aSurface->GetExpirationState()->IsTracked()) {
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sExpirationTracker->MarkUsed(aSurface);
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return;
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}
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if (!sExpirationTracker) {
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sExpirationTracker = new CachedSurfaceExpirationTracker();
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}
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sExpirationTracker->AddObject(aSurface);
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}
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static void RemoveSurface(gfxCachedTempSurface* aSurface)
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{
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if (!sExpirationTracker)
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return;
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if (aSurface->GetExpirationState()->IsTracked()) {
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sExpirationTracker->RemoveObject(aSurface);
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}
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if (sExpirationTracker->IsEmpty()) {
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delete sExpirationTracker;
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sExpirationTracker = nsnull;
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}
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}
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private:
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static CachedSurfaceExpirationTracker* sExpirationTracker;
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};
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CachedSurfaceExpirationTracker*
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CachedSurfaceExpirationTracker::sExpirationTracker = nsnull;
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gfxCachedTempSurface::~gfxCachedTempSurface()
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{
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CachedSurfaceExpirationTracker::RemoveSurface(this);
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}
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already_AddRefed<gfxContext>
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gfxCachedTempSurface::Get(gfxASurface::gfxContentType aContentType,
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const gfxRect& aRect,
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gfxASurface* aSimilarTo)
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{
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if (mSurface) {
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/* Verify the current buffer is valid for this purpose */
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if (mSize.width < aRect.width || mSize.height < aRect.height
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|| mSurface->GetContentType() != aContentType) {
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mSurface = nsnull;
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} else {
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NS_ASSERTION(mType == aSimilarTo->GetType(),
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"Unexpected surface type change");
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}
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}
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bool cleared = false;
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if (!mSurface) {
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mSize = gfxIntSize(PRInt32(ceil(aRect.width)), PRInt32(ceil(aRect.height)));
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mSurface = aSimilarTo->CreateSimilarSurface(aContentType, mSize);
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if (!mSurface)
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return nsnull;
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cleared = true;
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#ifdef DEBUG
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mType = aSimilarTo->GetType();
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#endif
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}
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mSurface->SetDeviceOffset(-aRect.TopLeft());
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nsRefPtr<gfxContext> ctx = new gfxContext(mSurface);
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ctx->Rectangle(aRect);
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ctx->Clip();
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if (!cleared && aContentType != gfxASurface::CONTENT_COLOR) {
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ctx->SetOperator(gfxContext::OPERATOR_CLEAR);
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ctx->Paint();
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ctx->SetOperator(gfxContext::OPERATOR_OVER);
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}
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CachedSurfaceExpirationTracker::MarkSurfaceUsed(this);
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return ctx.forget();
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}
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