392 lines
11 KiB
C++
392 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "nsHTMLImageLoader.h"
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#include "nsIHTMLReflow.h"
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#include "nsFrame.h"
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#include "nsIURL.h"
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#ifdef NECKO
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#include "nsIIOService.h"
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#include "nsIURL.h"
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#include "nsIServiceManager.h"
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static NS_DEFINE_CID(kIOServiceCID, NS_IOSERVICE_CID);
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#endif // NECKO
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#ifdef DEBUG
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#undef NOISY_IMAGE_LOADING
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#else
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#undef NOISY_IMAGE_LOADING
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#endif
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nsHTMLImageLoader::nsHTMLImageLoader()
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: mBaseURL(nsnull),
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mFrame(nsnull),
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mCallBack(nsnull),
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mClosure(nsnull),
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mImageLoader(nsnull),
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mAllFlags(0),
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mIntrinsicImageSize(0, 0),
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mComputedImageSize(0, 0)
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{
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}
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nsHTMLImageLoader::~nsHTMLImageLoader()
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{
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NS_IF_RELEASE(mBaseURL);
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NS_IF_RELEASE(mImageLoader);
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}
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void
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nsHTMLImageLoader::Init(nsIFrame* aFrame,
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nsHTMLImageLoaderCB aCallBack,
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void* aClosure,
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nsIURI* aBaseURL,
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const nsString& aURLSpec)
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{
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mFrame = aFrame;
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mCallBack = aCallBack;
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mClosure = aClosure;
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mBaseURL = aBaseURL;
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NS_IF_ADDREF(mBaseURL);
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SetURL(aURLSpec);
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}
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nsIImage*
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nsHTMLImageLoader::GetImage()
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{
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nsIImage* image = nsnull;
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if (mImageLoader) {
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mImageLoader->GetImage(&image);
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}
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return image;
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}
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void
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nsHTMLImageLoader::SetURL(const nsString& aNewSpec)
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{
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mURLSpec = aNewSpec;
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if (mBaseURL && !aNewSpec.Equals("")) {
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nsString empty;
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nsresult rv;
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#ifndef NECKO
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rv = NS_MakeAbsoluteURL(mBaseURL, empty, mURLSpec, mURL);
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#else
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NS_WITH_SERVICE(nsIIOService, service, kIOServiceCID, &rv);
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if (NS_FAILED(rv)) return;
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nsIURI *baseUri = nsnull;
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rv = mBaseURL->QueryInterface(nsIURI::GetIID(), (void**)&baseUri);
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if (NS_FAILED(rv)) return;
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char *absUrl = nsnull;
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const char *urlSpec = mURLSpec.GetBuffer();
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rv = service->MakeAbsolute(urlSpec, baseUri, &absUrl);
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NS_RELEASE(baseUri);
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mURL = absUrl;
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delete [] absUrl;
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#endif // NECKO
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if (NS_FAILED(rv)) {
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mURL = mURLSpec;
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}
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} else {
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mURL = mURLSpec;
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}
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}
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void
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nsHTMLImageLoader::StopLoadImage(nsIPresContext* aPresContext)
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{
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if (mImageLoader) {
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aPresContext->StopLoadImage(mFrame, mImageLoader);
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NS_RELEASE(mImageLoader);
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}
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}
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void
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nsHTMLImageLoader::StopAllLoadImages(nsIPresContext* aPresContext)
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{
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aPresContext->StopAllLoadImagesFor(mFrame);
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}
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nsresult
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nsHTMLImageLoader::ImageLoadCB(nsIPresContext* aPresContext,
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nsIFrameImageLoader* aLoader,
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nsIFrame* aFrame,
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void* aClosure,
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PRUint32 aStatus)
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{
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if (aClosure) {
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((nsHTMLImageLoader*)aClosure)->Update(aPresContext, aFrame, aStatus);
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}
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return NS_OK;
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}
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void
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nsHTMLImageLoader::Update(nsIPresContext* aPresContext,
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nsIFrame* aFrame,
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PRUint32 aStatus)
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{
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#ifdef NOISY_IMAGE_LOADING
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nsFrame::ListTag(stdout, aFrame);
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printf(": update: status=%x [loader=%p] callBack=%p squelch=%s\n",
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aStatus, mImageLoader, mCallBack,
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mFlags.mSquelchCallback ? "yes" : "no");
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#endif
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if (NS_IMAGE_LOAD_STATUS_SIZE_AVAILABLE & aStatus) {
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if (mImageLoader) {
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mImageLoader->GetSize(mIntrinsicImageSize);
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if (mFlags.mNeedIntrinsicImageSize) {
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mFlags.mHaveIntrinsicImageSize = PR_TRUE;
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}
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}
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if ((NS_IMAGE_LOAD_STATUS_SIZE_AVAILABLE == aStatus) &&
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!mFlags.mNeedSizeNotification) {
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return;
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}
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}
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// Pass on update to the user of this object if they want it
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if (mCallBack) {
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if (!mFlags.mSquelchCallback) {
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(*mCallBack)(aPresContext, this, aFrame, mClosure, aStatus);
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}
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}
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}
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nsresult
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nsHTMLImageLoader::StartLoadImage(nsIPresContext* aPresContext)
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{
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if (!mFrame) {
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// We were not initialized!
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return NS_ERROR_NULL_POINTER;
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}
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if (mURL.Equals("")) {
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return NS_OK;
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}
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// This is kind of sick, but its possible that we will get a
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// notification *before* we have setup mImageLoader. To get around
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// this, we let the pres-context store into mImageLoader and sort
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// things after it returns.
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nsIFrameImageLoader* oldLoader = mImageLoader;
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nsSize* sizeToLoadWidth = nsnull;
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if (!mFlags.mAutoImageSize && !mFlags.mNeedIntrinsicImageSize) {
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sizeToLoadWidth = &mComputedImageSize;
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}
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nsresult rv = aPresContext->StartLoadImage(mURL, nsnull,
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sizeToLoadWidth,
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mFrame, ImageLoadCB, (void*)this,
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&mImageLoader);
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#ifdef NOISY_IMAGE_LOADING
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nsFrame::ListTag(stdout, mFrame);
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printf(": loading image '");
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fputs(mURL, stdout);
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printf("' @ ");
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if (mFlags.mNeedIntrinsicImageSize) {
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printf("intrinsic size ");
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}
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printf("%d,%d; oldLoader=%p newLoader=%p\n",
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mComputedImageSize.width, mComputedImageSize.height,
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oldLoader, mImageLoader);
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#endif
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if (oldLoader != mImageLoader) {
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if (nsnull != oldLoader) {
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// Tell presentation context we are done with the old image loader
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aPresContext->StopLoadImage(mFrame, oldLoader);
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}
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}
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// Release the old image loader
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NS_IF_RELEASE(oldLoader);
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return rv;
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}
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void
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nsHTMLImageLoader::UpdateURLSpec(nsIPresContext* aPresContext,
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const nsString& aNewSpec)
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{
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SetURL(aNewSpec);
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// Start image loading with the previously computed size information
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StartLoadImage(aPresContext);
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}
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PRBool
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nsHTMLImageLoader::GetDesiredSize(nsIPresContext* aPresContext,
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const nsHTMLReflowState* aReflowState,
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nsHTMLReflowMetrics& aDesiredSize)
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{
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nscoord widthConstraint = NS_INTRINSICSIZE;
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nscoord heightConstraint = NS_INTRINSICSIZE;
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PRBool fixedContentWidth = PR_FALSE;
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PRBool fixedContentHeight = PR_FALSE;
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if (aReflowState) {
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widthConstraint = aReflowState->computedWidth;
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heightConstraint = aReflowState->computedHeight;
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// Determine whether the image has fixed content width and height
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fixedContentWidth = aReflowState->HaveFixedContentWidth();
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fixedContentHeight = aReflowState->HaveFixedContentHeight();
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if (NS_INTRINSICSIZE == widthConstraint) {
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fixedContentWidth = PR_FALSE;
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}
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if (NS_INTRINSICSIZE == heightConstraint) {
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fixedContentHeight = PR_FALSE;
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}
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}
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for (;;) {
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PRBool haveComputedSize = PR_FALSE;
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PRBool needIntrinsicImageSize = PR_FALSE;
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nscoord newWidth, newHeight;
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mFlags.mAutoImageSize = PR_FALSE;
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mFlags.mNeedSizeNotification = PR_FALSE;
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if (fixedContentWidth) {
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if (fixedContentHeight) {
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newWidth = widthConstraint;
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newHeight = heightConstraint;
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haveComputedSize = PR_TRUE;
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}
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else {
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// We have a width, and an auto height. Compute height from
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// width once we have the intrinsic image size.
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newWidth = widthConstraint;
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if (mFlags.mHaveIntrinsicImageSize) {
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float width = mIntrinsicImageSize.width
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? mIntrinsicImageSize.width
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: mIntrinsicImageSize.height; // avoid divide by zero
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float height = mIntrinsicImageSize.height;
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newHeight = (nscoord)
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NSToIntRound(widthConstraint * height / width);
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haveComputedSize = PR_TRUE;
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}
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else {
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newHeight = 1;
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needIntrinsicImageSize = PR_TRUE;
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mFlags.mNeedSizeNotification = PR_TRUE;
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}
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}
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}
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else if (fixedContentHeight) {
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// We have a height, and an auto width. Compute width from height
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// once we have the intrinsic image size.
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newHeight = heightConstraint;
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if (mFlags.mHaveIntrinsicImageSize) {
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float width = mIntrinsicImageSize.width;
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float height = mIntrinsicImageSize.height
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? mIntrinsicImageSize.height
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: mIntrinsicImageSize.width; // avoid divide by zero
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newWidth = (nscoord)
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NSToIntRound(heightConstraint * width / height);
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haveComputedSize = PR_TRUE;
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}
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else {
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newWidth = 1;
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needIntrinsicImageSize = PR_TRUE;
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mFlags.mNeedSizeNotification = PR_TRUE;
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}
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}
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else {
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mFlags.mAutoImageSize = PR_TRUE;
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if (mFlags.mHaveIntrinsicImageSize) {
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newWidth = mIntrinsicImageSize.width;
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newHeight = mIntrinsicImageSize.height;
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haveComputedSize = PR_TRUE;
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}
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else {
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newWidth = 1;
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newHeight = 1;
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needIntrinsicImageSize = PR_TRUE;
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mFlags.mNeedSizeNotification = PR_TRUE;
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}
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}
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mFlags.mNeedIntrinsicImageSize = needIntrinsicImageSize;
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mFlags.mHaveComputedSize = haveComputedSize;
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mComputedImageSize.width = newWidth;
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mComputedImageSize.height = newHeight;
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#ifdef NOISY_IMAGE_LOADING
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nsFrame::ListTag(stdout, mFrame);
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printf(": %s%scomputedSize=%d,%d\n",
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mFlags.mNeedIntrinsicImageSize ? "need-instrinsic-size " : "",
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mFlags.mHaveComputedSize ? "have-computed-size " : "",
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mComputedImageSize.width, mComputedImageSize.height);
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#endif
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// Load the image at the desired size
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if ((0 != newWidth) && (0 != newHeight)) {
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// Make sure we squelch a callback to the client of this image
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// loader during a start-load-image. Its possible the image we
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// want is ready to go and will therefore fire a notification
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// during the StartLoadImage call. Since this routine is already
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// returning size information there is no point in passing on the
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// callbacks to the client.
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mFlags.mSquelchCallback = PR_TRUE;
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StartLoadImage(aPresContext);
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mFlags.mSquelchCallback = PR_FALSE;
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// See if we just got the intrinsic size
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if (mFlags.mNeedIntrinsicImageSize && mFlags.mHaveIntrinsicImageSize) {
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// We just learned our intrinisic size. Start over from the top...
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#ifdef NOISY_IMAGE_LOADING
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printf(" *** size arrived during StartLoadImage, looping...\n");
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#endif
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continue;
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}
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}
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break;
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}
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aDesiredSize.width = mComputedImageSize.width;
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aDesiredSize.height = mComputedImageSize.height;
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if ((mFlags.mNeedIntrinsicImageSize && !mFlags.mHaveIntrinsicImageSize) ||
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mFlags.mNeedSizeNotification) {
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return PR_FALSE;
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}
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return PR_TRUE;
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}
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PRBool
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nsHTMLImageLoader::GetLoadImageFailed() const
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{
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PRBool result = PR_FALSE;
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if (nsnull != mImageLoader) {
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// Ask the image loader whether the load failed
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PRUint32 loadStatus;
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mImageLoader->GetImageLoadStatus(&loadStatus);
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result = 0 != (loadStatus & NS_IMAGE_LOAD_STATUS_ERROR);
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return result;
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}
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result = mFlags.mLoadImageFailed ? PR_TRUE : PR_FALSE;
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return result;
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}
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PRUint32
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nsHTMLImageLoader::GetLoadStatus() const
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{
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PRUint32 loadStatus = NS_IMAGE_LOAD_STATUS_NONE;
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if (mImageLoader) {
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mImageLoader->GetImageLoadStatus(&loadStatus);
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}
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return loadStatus;
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}
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