481 lines
15 KiB
C++
481 lines
15 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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#include "nsNeckoUtil.h"
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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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MOZ_DECL_CTOR_COUNTER(nsHTMLImageLoader);
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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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MOZ_COUNT_CTOR(nsHTMLImageLoader);
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}
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nsHTMLImageLoader::~nsHTMLImageLoader()
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{
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MOZ_COUNT_DTOR(nsHTMLImageLoader);
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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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rv = NS_MakeAbsoluteURI(mURLSpec, mBaseURL, mURL);
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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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// The prefix for special "internal" images that are well known
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#define GOPHER_SPEC "internal-gopher-"
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// Note: sizeof a string constant includes the \0 at the end so
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// subtract one
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#define GOPHER_SPEC_SIZE (sizeof(GOPHER_SPEC) - 1)
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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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// Note: navigator 4.* and earlier releases ignored the base tags
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// effect on the builtin images. So we do too. Use mURLSpec instead
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// of the absolute url...
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nsAutoString internalImageURLSpec;
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nsString* urlSpec = &mURL;
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if (mURLSpec.Compare(GOPHER_SPEC, PR_FALSE, GOPHER_SPEC_SIZE) == 0) {
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// We found a special image source value that refers to a
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// builtin image. Rewrite the source url as a resource url.
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urlSpec = &internalImageURLSpec;
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mURLSpec.Mid(internalImageURLSpec, GOPHER_SPEC_SIZE,
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mURLSpec.Length() - GOPHER_SPEC_SIZE);
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internalImageURLSpec.Insert("resource:/res/html/gopher-", 0);
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internalImageURLSpec.Append(".gif");
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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(*urlSpec, 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",
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mComputedImageSize.width, mComputedImageSize.height,
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oldLoader, mImageLoader);
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if (sizeToLoadWidth) {
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printf(" sizeToLoadWidth=%d,%d",
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sizeToLoadWidth->width, sizeToLoadWidth->height);
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}
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else {
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printf(" autoImageSize=%s needIntrinsicImageSize=%s",
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mFlags.mAutoImageSize ? "yes" : "no",
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mFlags.mNeedIntrinsicImageSize ? "yes" : "no");
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}
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printf("\n");
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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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#define MINMAX(_value,_min,_max) \
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((_value) < (_min) \
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? (_min) \
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: ((_value) > (_max) \
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? (_max) \
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: (_value)))
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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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nscoord minWidth, maxWidth, minHeight, maxHeight;
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if (aReflowState) {
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// Determine whether the image has fixed content width
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widthConstraint = aReflowState->mComputedWidth;
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minWidth = aReflowState->mComputedMinWidth;
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maxWidth = aReflowState->mComputedMaxWidth;
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if (NS_INTRINSICSIZE != widthConstraint) {
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fixedContentWidth = PR_TRUE;
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}
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else if (mFlags.mHaveIntrinsicImageSize) {
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// At this point we know that the width value was not
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// constrained and that we now know the intrinsic size of the
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// image.
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//
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// The css2 spec states that if a min/max width value is
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// provided then it acts as a substitute value for the "width"
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// property, if it applies. Therefore, we will force the
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// fixedContentWidth flag to true in these cases.
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if ((0 != minWidth) ||
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(NS_UNCONSTRAINEDSIZE != maxWidth)) {
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// Use the intrinsic image height for the min-max comparisons,
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// since the width property is "auto".
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widthConstraint = mIntrinsicImageSize.width;
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fixedContentWidth = PR_TRUE;
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}
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}
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// Determine whether the image has fixed content height
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heightConstraint = aReflowState->mComputedHeight;
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minHeight = aReflowState->mComputedMinHeight;
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maxHeight = aReflowState->mComputedMaxHeight;
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if (NS_UNCONSTRAINEDSIZE != heightConstraint) {
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fixedContentHeight = PR_TRUE;
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}
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else if (mFlags.mHaveIntrinsicImageSize) {
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// At this point we know that the height value was not
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// constrained and that we now know the intrinsic size of the
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// image.
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//
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// The css2 spec states that if a min/max height value is
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// provided then it acts as a substitute value for the "height"
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// property, if it applies. Therefore, we will force the
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// fixedContentHeight flag to true in these cases.
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if ((0 != minHeight) ||
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(NS_UNCONSTRAINEDSIZE != maxHeight)) {
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// Use the intrinsic image height for the min-max comparisons,
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// since the height property is "auto".
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heightConstraint = mIntrinsicImageSize.height;
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fixedContentHeight = PR_TRUE;
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}
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}
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}
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else {
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minWidth = minHeight = 0;
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maxWidth = maxHeight = NS_UNCONSTRAINEDSIZE;
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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 = MINMAX(widthConstraint, minWidth, maxWidth);
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newHeight = MINMAX(heightConstraint, minHeight, maxHeight);
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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 = MINMAX(widthConstraint, minWidth, maxWidth);
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if (mFlags.mHaveIntrinsicImageSize) {
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float width = mIntrinsicImageSize.width
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? (float) mIntrinsicImageSize.width
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: (float) mIntrinsicImageSize.height; // avoid divide by zero
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float height = (float) mIntrinsicImageSize.height;
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newHeight = (nscoord)
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NSToIntRound(newWidth * height / width);
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newHeight = MINMAX(newHeight, minHeight, maxHeight);
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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 = MINMAX(heightConstraint, minHeight, maxHeight);
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if (mFlags.mHaveIntrinsicImageSize) {
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float width = (float) mIntrinsicImageSize.width;
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float height = mIntrinsicImageSize.height
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? (float) mIntrinsicImageSize.height
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: (float) mIntrinsicImageSize.width; // avoid divide by zero
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newWidth = (nscoord)
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NSToIntRound(newHeight * width / height);
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newWidth = MINMAX(newWidth, minWidth, maxWidth);
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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 = MINMAX(mIntrinsicImageSize.width, minWidth, maxWidth);
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newHeight = MINMAX(mIntrinsicImageSize.height, minHeight, maxHeight);
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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 min=%d,%d max=%d,%d fixed=%s,%s\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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minWidth, minHeight, maxWidth, maxHeight,
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fixedContentWidth ? "yes" : "no",
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fixedContentHeight ? "yes" : "no");
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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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#ifdef DEBUG
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// Note: this doesn't factor in:
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// -- the mBaseURL (it might be shared)
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// -- the mFrame (that will be counted elsewhere most likely)
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// -- the mClosure (we don't know what type it is)
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// -- the mImageLoader (it might be shared)
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void
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nsHTMLImageLoader::SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const
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{
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PRUint32 sum = sizeof(*this) - sizeof(mURLSpec) - sizeof(mURL);
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PRUint32 ss;
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mURLSpec.SizeOf(aHandler, &ss); sum += ss;
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mURL.SizeOf(aHandler, &ss); sum += ss;
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*aResult = sum;
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}
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#endif
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