зеркало из https://github.com/mozilla/gecko-dev.git
111 строки
3.1 KiB
C++
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();
|
|
}
|