gecko-dev/gfx/thebes/gfxCachedTempSurface.cpp

111 строки
3.1 KiB
C++

/* -*- Mode: C++; tab-width: 20; 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/. */
#include "gfxCachedTempSurface.h"
#include "gfxContext.h"
#include "mozilla/Attributes.h"
class CachedSurfaceExpirationTracker MOZ_FINAL :
public nsExpirationTracker<gfxCachedTempSurface,2> {
public:
// With K = 2, this means that surfaces will be released when they are not
// used for 1-2 seconds.
enum { TIMEOUT_MS = 1000 };
CachedSurfaceExpirationTracker()
: nsExpirationTracker<gfxCachedTempSurface,2>(TIMEOUT_MS) {}
~CachedSurfaceExpirationTracker() {
AgeAllGenerations();
}
virtual void NotifyExpired(gfxCachedTempSurface* aSurface) {
RemoveObject(aSurface);
aSurface->Expire();
}
static void MarkSurfaceUsed(gfxCachedTempSurface* aSurface)
{
if (aSurface->GetExpirationState()->IsTracked()) {
sExpirationTracker->MarkUsed(aSurface);
return;
}
if (!sExpirationTracker) {
sExpirationTracker = new CachedSurfaceExpirationTracker();
}
sExpirationTracker->AddObject(aSurface);
}
static void RemoveSurface(gfxCachedTempSurface* aSurface)
{
if (!sExpirationTracker)
return;
if (aSurface->GetExpirationState()->IsTracked()) {
sExpirationTracker->RemoveObject(aSurface);
}
if (sExpirationTracker->IsEmpty()) {
delete sExpirationTracker;
sExpirationTracker = nullptr;
}
}
private:
static CachedSurfaceExpirationTracker* sExpirationTracker;
};
CachedSurfaceExpirationTracker*
CachedSurfaceExpirationTracker::sExpirationTracker = nullptr;
gfxCachedTempSurface::~gfxCachedTempSurface()
{
CachedSurfaceExpirationTracker::RemoveSurface(this);
}
already_AddRefed<gfxContext>
gfxCachedTempSurface::Get(gfxASurface::gfxContentType aContentType,
const gfxRect& aRect,
gfxASurface* aSimilarTo)
{
if (mSurface) {
/* Verify the current buffer is valid for this purpose */
if (mSize.width < aRect.width || mSize.height < aRect.height
|| mSurface->GetContentType() != aContentType) {
mSurface = nullptr;
} else {
NS_ASSERTION(mType == aSimilarTo->GetType(),
"Unexpected surface type change");
}
}
bool cleared = false;
if (!mSurface) {
mSize = gfxIntSize(int32_t(ceil(aRect.width)), int32_t(ceil(aRect.height)));
mSurface = aSimilarTo->CreateSimilarSurface(aContentType, mSize);
if (!mSurface)
return nullptr;
cleared = true;
#ifdef DEBUG
mType = aSimilarTo->GetType();
#endif
}
mSurface->SetDeviceOffset(-aRect.TopLeft());
nsRefPtr<gfxContext> ctx = new gfxContext(mSurface);
ctx->Rectangle(aRect);
ctx->Clip();
if (!cleared && aContentType != gfxASurface::CONTENT_COLOR) {
ctx->SetOperator(gfxContext::OPERATOR_CLEAR);
ctx->Paint();
ctx->SetOperator(gfxContext::OPERATOR_OVER);
}
CachedSurfaceExpirationTracker::MarkSurfaceUsed(this);
return ctx.forget();
}