зеркало из https://github.com/mozilla/gecko-dev.git
107 строки
3.0 KiB
C++
107 строки
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 20; 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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#include "gfxCachedTempSurface.h"
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#include "gfxContext.h"
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#include "mozilla/Attributes.h"
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class CachedSurfaceExpirationTracker MOZ_FINAL :
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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 = nullptr;
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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 = nullptr;
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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(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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|| mType != aSimilarTo->GetType()) {
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mSurface = nullptr;
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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(int32_t(ceil(aRect.width)), int32_t(ceil(aRect.height)));
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mSurface = aSimilarTo->CreateSimilarSurface(aContentType, mSize);
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if (!mSurface)
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return nullptr;
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cleared = true;
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mType = aSimilarTo->GetType();
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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 != gfxContentType::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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