gecko-dev/layout/base/nsImageLoader.cpp

272 lines
7.5 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Stuart Parmenter <pavlov@netscape.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* 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 "nsIDocument.h"
#include "imgIContainer.h"
#include "nsStyleContext.h"
#include "nsGkAtoms.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)
{
}
nsImageLoader::~nsImageLoader()
{
mFrame = nsnull;
if (mRequest) {
mRequest->CancelAndForgetObserver(NS_ERROR_FAILURE);
}
}
/* 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 = nsnull;
while (list) {
nsRefPtr<nsImageLoader> todestroy = list;
list = todestroy->mNextLoader;
todestroy->mNextLoader = nsnull;
todestroy->Destroy();
}
mFrame = nsnull;
if (mRequest) {
mRequest->CancelAndForgetObserver(NS_ERROR_FAILURE);
}
mRequest = nsnull;
}
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;
// 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);
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_REFLOW_ON_DECODE) {
DoReflow();
}
if (mActions & ACTION_REDRAW_ON_DECODE) {
DoRedraw(nsnull);
}
return NS_OK;
}
NS_IMETHODIMP nsImageLoader::OnStopRequest(imgIRequest *aRequest,
PRBool 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_REFLOW_ON_LOAD) {
DoReflow();
}
if (mActions & ACTION_REDRAW_ON_LOAD) {
DoRedraw(nsnull);
}
return NS_OK;
}
NS_IMETHODIMP nsImageLoader::FrameChanged(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;
}
nsRect r = aDirtyRect->IsEqualInterior(nsIntRect::GetMaxSizedIntRect()) ?
nsRect(nsPoint(0, 0), mFrame->GetSize()) :
aDirtyRect->ToAppUnits(nsPresContext::AppUnitsPerCSSPixel());
DoRedraw(&r);
return NS_OK;
}
void
nsImageLoader::DoReflow()
{
nsIPresShell *shell = mFrame->PresContext()->GetPresShell();
shell->FrameNeedsReflow(mFrame, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY);
}
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);
}
}