gecko/layout/base/nsImageLoader.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
2012-05-21 04:12:37 -07:00
* 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/. */
/* class to notify frames of background image loads */
#include "nsImageLoader.h"
#include "imgILoader.h"
#include "nsIURI.h"
#include "nsILoadGroup.h"
#include "nsNetUtil.h"
#include "nsPresContext.h"
#include "nsIPresShell.h"
#include "nsIFrame.h"
#include "nsIContent.h"
#include "imgIContainer.h"
#include "nsStyleContext.h"
#include "nsGkAtoms.h"
#include "nsLayoutUtils.h"
// Paint forcing
#include "prenv.h"
NS_IMPL_ISUPPORTS2(nsImageLoader, imgIDecoderObserver, imgIContainerObserver)
nsImageLoader::nsImageLoader(nsIFrame *aFrame, PRUint32 aActions,
nsImageLoader *aNextLoader)
: mFrame(aFrame),
mActions(aActions),
mNextLoader(aNextLoader),
mRequestRegistered(false)
{
}
nsImageLoader::~nsImageLoader()
{
Destroy();
}
/* static */ already_AddRefed<nsImageLoader>
nsImageLoader::Create(nsIFrame *aFrame, imgIRequest *aRequest,
PRUint32 aActions, nsImageLoader *aNextLoader)
{
nsRefPtr<nsImageLoader> loader =
new nsImageLoader(aFrame, aActions, aNextLoader);
loader->Load(aRequest);
return loader.forget();
}
void
nsImageLoader::Destroy()
{
// Destroy the chain with only one level of recursion.
nsRefPtr<nsImageLoader> list = mNextLoader;
mNextLoader = nullptr;
while (list) {
nsRefPtr<nsImageLoader> todestroy = list;
list = todestroy->mNextLoader;
todestroy->mNextLoader = nullptr;
todestroy->Destroy();
}
if (mRequest && mFrame) {
nsLayoutUtils::DeregisterImageRequest(mFrame->PresContext(), mRequest,
&mRequestRegistered);
}
mFrame = nullptr;
if (mRequest) {
mRequest->CancelAndForgetObserver(NS_ERROR_FAILURE);
}
mRequest = nullptr;
}
nsresult
nsImageLoader::Load(imgIRequest *aImage)
{
NS_ASSERTION(!mRequest, "can't reuse image loaders");
NS_ASSERTION(mFrame, "not initialized");
NS_ASSERTION(aImage, "must have non-null image");
if (!mFrame)
return NS_ERROR_NOT_INITIALIZED;
if (!aImage)
return NS_ERROR_FAILURE;
// Deregister mRequest from the refresh driver, since it is no longer
// going to be managed by this nsImageLoader.
nsPresContext* presContext = mFrame->PresContext();
nsLayoutUtils::DeregisterImageRequest(presContext, mRequest,
&mRequestRegistered);
// Make sure to clone into a temporary, then set mRequest, since
// cloning may notify and we don't want to trigger paints from this
// code.
nsCOMPtr<imgIRequest> newRequest;
nsresult rv = aImage->Clone(this, getter_AddRefs(newRequest));
mRequest.swap(newRequest);
if (mRequest) {
nsLayoutUtils::RegisterImageRequestIfAnimated(presContext, mRequest,
&mRequestRegistered);
}
return rv;
}
NS_IMETHODIMP nsImageLoader::OnStartContainer(imgIRequest *aRequest,
imgIContainer *aImage)
{
NS_ABORT_IF_FALSE(aImage, "Who's calling us then?");
/* Get requested animation policy from the pres context:
* normal = 0
* one frame = 1
* one loop = 2
*/
aImage->SetAnimationMode(mFrame->PresContext()->ImageAnimationMode());
return NS_OK;
}
NS_IMETHODIMP nsImageLoader::OnStopFrame(imgIRequest *aRequest,
PRUint32 aFrame)
{
if (!mFrame)
return NS_ERROR_FAILURE;
if (!mRequest) {
// We're in the middle of a paint anyway
return NS_OK;
}
// Take requested actions
if (mActions & ACTION_REDRAW_ON_DECODE) {
DoRedraw(nullptr);
}
return NS_OK;
}
NS_IMETHODIMP nsImageLoader::OnImageIsAnimated(imgIRequest *aRequest)
{
// Register with the refresh driver now that we are aware that
// we are animated.
nsLayoutUtils::RegisterImageRequest(mFrame->PresContext(),
aRequest, &mRequestRegistered);
return NS_OK;
}
NS_IMETHODIMP nsImageLoader::OnStopRequest(imgIRequest *aRequest,
bool aLastPart)
{
if (!mFrame)
return NS_ERROR_FAILURE;
if (!mRequest) {
// We're in the middle of a paint anyway
return NS_OK;
}
// Take requested actions
if (mActions & ACTION_REDRAW_ON_LOAD) {
DoRedraw(nullptr);
}
return NS_OK;
}
NS_IMETHODIMP nsImageLoader::FrameChanged(imgIRequest *aRequest,
imgIContainer *aContainer,
const nsIntRect *aDirtyRect)
{
if (!mFrame)
return NS_ERROR_FAILURE;
if (!mRequest) {
// We're in the middle of a paint anyway
return NS_OK;
}
NS_ASSERTION(aRequest == mRequest, "This is a neat trick.");
nsRect r = aDirtyRect->IsEqualInterior(nsIntRect::GetMaxSizedIntRect()) ?
nsRect(nsPoint(0, 0), mFrame->GetSize()) :
aDirtyRect->ToAppUnits(nsPresContext::AppUnitsPerCSSPixel());
DoRedraw(&r);
return NS_OK;
}
void
nsImageLoader::DoRedraw(const nsRect* aDamageRect)
{
// NOTE: It is not sufficient to invalidate only the size of the image:
// the image may be tiled!
// The best option is to call into the frame, however lacking this
// we have to at least invalidate the frame's bounds, hence
// as long as we have a frame we'll use its size.
//
// Invalidate the entire frame
// XXX We really only need to invalidate the client area of the frame...
nsRect bounds(nsPoint(0, 0), mFrame->GetSize());
if (mFrame->GetType() == nsGkAtoms::canvasFrame) {
// The canvas's background covers the whole viewport.
bounds = mFrame->GetVisualOverflowRect();
}
// XXX this should be ok, but there is some crappy ass bug causing it not to work
// XXX seems related to the "body fixup rule" dealing with the canvas and body frames...
#if 0
// Invalidate the entire frame only if the frame has a tiled background
// image, otherwise just invalidate the intersection of the frame's bounds
// with the damaged rect.
nsStyleContext* styleContext;
mFrame->GetStyleContext(&styleContext);
const nsStyleBackground* bg = styleContext->GetStyleBackground();
if ((bg->mBackgroundFlags & NS_STYLE_BG_IMAGE_NONE) ||
(bg->mBackgroundRepeat == NS_STYLE_BG_REPEAT_OFF)) {
// The frame does not have a background image so we are free
// to invalidate only the intersection of the damage rect and
// the frame's bounds.
if (aDamageRect) {
bounds.IntersectRect(*aDamageRect, bounds);
}
}
#endif
if (mFrame->GetStyleVisibility()->IsVisible()) {
mFrame->Invalidate(bounds);
}
}