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gecko-dev/layout/generic/nsImageFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#include "nsHTMLParts.h"
#include "nsCOMPtr.h"
#include "nsImageFrame.h"
#include "nsString.h"
#include "nsIPresContext.h"
#include "nsIRenderingContext.h"
#include "nsIPresShell.h"
#include "nsHTMLIIDs.h"
#include "nsIImage.h"
#include "nsIWidget.h"
#include "nsHTMLAtoms.h"
#include "nsIHTMLContent.h"
#include "nsIDocument.h"
#include "nsIStyleContext.h"
#include "nsStyleConsts.h"
#include "nsImageMap.h"
#include "nsILinkHandler.h"
#include "nsIURL.h"
#include "nsIIOService.h"
#include "nsIURL.h"
#include "nsILoadGroup.h"
#include "nsIServiceManager.h"
#include "nsNetUtil.h"
static NS_DEFINE_CID(kIOServiceCID, NS_IOSERVICE_CID);
#include "nsIView.h"
#include "nsIViewManager.h"
#include "nsHTMLContainerFrame.h"
#include "prprf.h"
#include "nsIFontMetrics.h"
#include "nsCSSRendering.h"
#include "nsIDOMHTMLAnchorElement.h"
#include "nsIDOMHTMLImageElement.h"
#include "nsIDeviceContext.h"
#include "nsINameSpaceManager.h"
#include "nsTextFragment.h"
#include "nsIDOMHTMLMapElement.h"
#include "nsIStyleSet.h"
#include "nsLayoutAtoms.h"
#include "nsISizeOfHandler.h"
#include "nsImageMapUtils.h"
#include "nsIFrameManager.h"
#include "nsIScriptSecurityManager.h"
#ifdef ACCESSIBILITY
#include "nsIAccessibilityService.h"
#endif
#include "nsIServiceManager.h"
#include "nsIDOMNode.h"
#include "nsGUIEvent.h"
#include "imgIContainer.h"
#include "imgILoader.h"
#include "nsIEventQueueService.h"
#include "plevent.h"
#include "nsContentPolicyUtils.h"
#include "nsIScriptGlobalObject.h"
#include "nsIDOMWindow.h"
#include "nsIDOMDocument.h"
#ifdef DEBUG
#undef NOISY_IMAGE_LOADING
#else
#undef NOISY_IMAGE_LOADING
#endif
// Value's for mSuppress
#define SUPPRESS_UNSET 0
#define DONT_SUPPRESS 1
#define SUPPRESS 2
#define DEFAULT_SUPPRESS 3
// Default alignment value (so we can tell an unset value from a set value)
#define ALIGN_UNSET PRUint8(-1)
// use the data in the reflow state to decide if the image has a constrained size
// (i.e. width and height that are based on the containing block size and not the image size)
// so we can avoid animated GIF related reflows
static void HaveFixedSize(const nsHTMLReflowState& aReflowState, PRPackedBool& aConstrainedSize);
nsresult
NS_NewImageFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
{
NS_PRECONDITION(aNewFrame, "null OUT ptr");
if (nsnull == aNewFrame) {
return NS_ERROR_NULL_POINTER;
}
nsImageFrame* it = new (aPresShell) nsImageFrame;
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
*aNewFrame = it;
return NS_OK;
}
nsImageFrame::nsImageFrame() :
mIntrinsicSize(0, 0),
mGotInitialReflow(PR_FALSE),
mFailureReplace(PR_TRUE)
{
// Size is constrained if we have a width and height.
// - Set in reflow in case the attributes are changed
mSizeConstrained = PR_FALSE;
}
nsImageFrame::~nsImageFrame()
{
}
NS_IMETHODIMP
nsImageFrame::QueryInterface(const nsIID& aIID, void** aInstancePtr)
{
NS_ENSURE_ARG_POINTER(aInstancePtr);
*aInstancePtr = nsnull;
#ifdef DEBUG
if (aIID.Equals(NS_GET_IID(nsIFrameDebug))) {
*aInstancePtr = NS_STATIC_CAST(nsIFrameDebug*,this);
return NS_OK;
}
#endif
if (aIID.Equals(NS_GET_IID(nsIImageFrame))) {
*aInstancePtr = NS_STATIC_CAST(nsIImageFrame*,this);
return NS_OK;
} else if (aIID.Equals(NS_GET_IID(nsIFrame))) {
*aInstancePtr = NS_STATIC_CAST(nsIFrame*,this);
return NS_OK;
} else if (aIID.Equals(NS_GET_IID(nsISupports))) {
*aInstancePtr = NS_STATIC_CAST(nsIImageFrame*,this);
return NS_OK;
}
return NS_NOINTERFACE;
}
#ifdef ACCESSIBILITY
NS_IMETHODIMP nsImageFrame::GetAccessible(nsIAccessible** aAccessible)
{
nsCOMPtr<nsIAccessibilityService> accService = do_GetService("@mozilla.org/accessibilityService;1");
if (accService) {
return accService->CreateHTMLImageAccessible(NS_STATIC_CAST(nsIFrame*, this), aAccessible);
}
return NS_ERROR_FAILURE;
}
#endif
NS_IMETHODIMP_(nsrefcnt) nsImageFrame::AddRef(void)
{
NS_WARNING("not supported for frames");
return 1;
}
NS_IMETHODIMP_(nsrefcnt) nsImageFrame::Release(void)
{
NS_WARNING("not supported for frames");
return 1;
}
NS_IMETHODIMP
nsImageFrame::Destroy(nsIPresContext* aPresContext)
{
// Tell our image map, if there is one, to clean up
// This causes the nsImageMap to unregister itself as
// a DOM listener.
if(mImageMap) {
mImageMap->Destroy();
NS_RELEASE(mImageMap);
}
if (mImageRequest)
mImageRequest->Cancel(NS_ERROR_FAILURE); // NS_BINDING_ABORT ?
if (mLowImageRequest)
mLowImageRequest->Cancel(NS_ERROR_FAILURE); // NS_BINDING_ABORT ?
// set the frame to null so we don't send messages to a dead object.
if (mListener)
NS_REINTERPRET_CAST(nsImageListener*, mListener.get())->SetFrame(nsnull);
mImageRequest = nsnull;
mLowImageRequest = nsnull;
mListener = nsnull;
return nsLeafFrame::Destroy(aPresContext);
}
NS_IMETHODIMP
nsImageFrame::Init(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsIStyleContext* aContext,
nsIFrame* aPrevInFlow)
{
nsresult rv = nsLeafFrame::Init(aPresContext, aContent, aParent,
aContext, aPrevInFlow);
// See if we have a SRC attribute
nsAutoString src;
nsresult ca;
ca = mContent->GetAttr(kNameSpaceID_HTML, nsHTMLAtoms::src, src);
if ((NS_CONTENT_ATTR_HAS_VALUE != ca) || (src.Length() == 0))
{
// Let's see if this is an object tag and we have a DATA attribute
nsIAtom* tag;
mContent->GetTag(tag);
if(tag == nsHTMLAtoms::object)
mContent->GetAttr(kNameSpaceID_HTML, nsHTMLAtoms::data, src);
NS_IF_RELEASE(tag);
}
nsAutoString lowSrc;
nsresult lowSrcResult;
lowSrcResult = mContent->GetAttr(kNameSpaceID_HTML, nsHTMLAtoms::lowsrc, lowSrc);
// Set the image loader's source URL and base URL
if (NS_CONTENT_ATTR_HAS_VALUE == lowSrcResult && !lowSrc.IsEmpty()) {
LoadImage(lowSrc, aPresContext, getter_AddRefs(mLowImageRequest));
}
mInitialLoadCompleted = PR_FALSE;
mCanSendLoadEvent = PR_TRUE;
rv = LoadImage(src, aPresContext, getter_AddRefs(mImageRequest)); // if the image was found in the cache,
// it is possible that LoadImage will result in
// a call to OnStartContainer()
return rv;
}
NS_IMETHODIMP nsImageFrame::OnStartDecode(imgIRequest *aRequest, nsIPresContext *aPresContext)
{
return NS_OK;
}
NS_IMETHODIMP nsImageFrame::OnStartContainer(imgIRequest *aRequest, nsIPresContext *aPresContext, imgIContainer *aImage)
{
mInitialLoadCompleted = PR_TRUE;
if (aImage)
{
/* Get requested animation policy from the pres context:
* normal = 0
* one frame = 1
* one loop = 2
*/
nsImageAnimation animateMode = eImageAnimation_Normal; //default value
nsresult rv = aPresContext->GetImageAnimationMode(&animateMode);
if (NS_SUCCEEDED(rv))
aImage->SetAnimationMode(animateMode);
}
nscoord w, h;
#ifdef DEBUG_pavlov
NS_ENSURE_ARG_POINTER(aImage);
#else
if (!aImage) return NS_ERROR_INVALID_ARG;
#endif
aImage->GetWidth(&w);
aImage->GetHeight(&h);
float p2t;
aPresContext->GetPixelsToTwips(&p2t);
nsSize newsize(NSIntPixelsToTwips(w, p2t), NSIntPixelsToTwips(h, p2t));
if (mIntrinsicSize != newsize) {
mIntrinsicSize = newsize;
if (mIntrinsicSize.width != 0 && mIntrinsicSize.height != 0)
mTransform.SetToScale((float(mComputedSize.width) / float(mIntrinsicSize.width)),
(float(mComputedSize.height) / float(mIntrinsicSize.height)));
if (!mSizeConstrained) {
nsCOMPtr<nsIPresShell> presShell;
aPresContext->GetShell(getter_AddRefs(presShell));
NS_ASSERTION(mParent, "No parent to pass the reflow request up to.");
NS_ASSERTION(presShell, "No PresShell.");
if (mParent && presShell && mGotInitialReflow) { // don't reflow if we havn't gotten the inital reflow yet
mState |= NS_FRAME_IS_DIRTY;
mParent->ReflowDirtyChild(presShell, NS_STATIC_CAST(nsIFrame*, this));
}
}
}
return NS_OK;
}
NS_IMETHODIMP nsImageFrame::OnStartFrame(imgIRequest *aRequest, nsIPresContext *aPresContext, gfxIImageFrame *aFrame)
{
return NS_OK;
}
NS_IMETHODIMP nsImageFrame::OnDataAvailable(imgIRequest *aRequest, nsIPresContext *aPresContext, gfxIImageFrame *aFrame, const nsRect *aRect)
{
// XXX do we need to make sure that the reflow from the OnStartContainer has been
// processed before we start calling invalidate
if (!aRect)
return NS_ERROR_NULL_POINTER;
nsRect r(aRect->x, aRect->y, aRect->width, aRect->height);
float p2t;
aPresContext->GetPixelsToTwips(&p2t);
r.x = NSIntPixelsToTwips(r.x, p2t);
r.y = NSIntPixelsToTwips(r.y, p2t);
r.width = NSIntPixelsToTwips(r.width, p2t);
r.height = NSIntPixelsToTwips(r.height, p2t);
mTransform.TransformCoord(&r.x, &r.y, &r.width, &r.height);
r.x += mBorderPadding.left;
r.y += mBorderPadding.top;
Invalidate(aPresContext, r, PR_FALSE);
return NS_OK;
}
NS_IMETHODIMP nsImageFrame::OnStopFrame(imgIRequest *aRequest, nsIPresContext *aPresContext, gfxIImageFrame *aFrame)
{
return NS_OK;
}
NS_IMETHODIMP nsImageFrame::OnStopContainer(imgIRequest *aRequest, nsIPresContext *aPresContext, imgIContainer *aImage)
{
return NS_OK;
}
static void PR_CALLBACK
HandleImagePLEvent(nsIContent *aContent, PRUint32 aMessage, PRUint32 aFlags)
{
nsCOMPtr<nsIDOMNode> node(do_QueryInterface(aContent));
if (!node) {
NS_ERROR("null or non-DOM node passed to HandleImagePLEvent!");
return;
}
nsCOMPtr<nsIDOMDocument> dom_doc;
node->GetOwnerDocument(getter_AddRefs(dom_doc));
nsCOMPtr<nsIDocument> doc(do_QueryInterface(dom_doc));
if (!doc) {
return;
}
nsCOMPtr<nsIPresShell> pres_shell;
doc->GetShellAt(0, getter_AddRefs(pres_shell));
if (!pres_shell) {
return;
}
nsCOMPtr<nsIPresContext> pres_context;
pres_shell->GetPresContext(getter_AddRefs(pres_context));
if (!pres_context) {
return;
}
nsEventStatus status = nsEventStatus_eIgnore;
nsEvent event;
event.eventStructType = NS_EVENT;
event.message = aMessage;
aContent->HandleDOMEvent(pres_context, &event, nsnull, aFlags, &status);
}
static void PR_CALLBACK
HandleImageOnloadPLEvent(PLEvent *aEvent)
{
nsIContent *content = (nsIContent *)PL_GetEventOwner(aEvent);
HandleImagePLEvent(content, NS_IMAGE_LOAD,
NS_EVENT_FLAG_INIT | NS_EVENT_FLAG_CANT_BUBBLE);
NS_RELEASE(content);
}
static void PR_CALLBACK
HandleImageOnerrorPLEvent(PLEvent *aEvent)
{
nsIContent *content = (nsIContent *)PL_GetEventOwner(aEvent);
HandleImagePLEvent(content, NS_IMAGE_ERROR, NS_EVENT_FLAG_INIT);
NS_RELEASE(content);
}
static void PR_CALLBACK
DestroyImagePLEvent(PLEvent* aEvent)
{
delete aEvent;
}
// Fire off a PLEvent that'll asynchronously call the image elements
// onload handler once handled. This is needed since the image library
// can't decide if it wants to call it's observer methods
// synchronously or asynchronously. If an image is loaded from the
// cache the notifications come back synchronously, but if the image
// is loaded from the netswork the notifications come back
// asynchronously.
void
nsImageFrame::FireDOMEvent(PRUint32 aMessage)
{
static NS_DEFINE_CID(kEventQueueServiceCID, NS_EVENTQUEUESERVICE_CID);
nsCOMPtr<nsIEventQueueService> event_service =
do_GetService(kEventQueueServiceCID);
if (!event_service) {
NS_WARNING("Failed to get event queue service");
return;
}
nsCOMPtr<nsIEventQueue> event_queue;
event_service->GetThreadEventQueue(NS_CURRENT_THREAD,
getter_AddRefs(event_queue));
if (!event_queue) {
NS_WARNING("Failed to get event queue from service");
return;
}
PLEvent *event = new PLEvent;
if (!event) {
// Out of memory, but none of our callers care, so just warn and
// don't fire the event
NS_WARNING("Out of memory?");
return;
}
PLHandleEventProc f;
switch (aMessage) {
case NS_IMAGE_LOAD :
f = (PLHandleEventProc)::HandleImageOnloadPLEvent;
break;
case NS_IMAGE_ERROR :
f = (PLHandleEventProc)::HandleImageOnerrorPLEvent;
break;
default:
NS_WARNING("Huh, I don't know how to fire this type of event?!");
return;
}
PL_InitEvent(event, mContent, f, (PLDestroyEventProc)::DestroyImagePLEvent);
// The event owns the content pointer now.
NS_ADDREF(mContent);
event_queue->PostEvent(event);
}
NS_IMETHODIMP nsImageFrame::OnStopDecode(imgIRequest *aRequest, nsIPresContext *aPresContext, nsresult aStatus, const PRUnichar *aStatusArg)
{
nsCOMPtr<nsIPresShell> presShell;
aPresContext->GetShell(getter_AddRefs(presShell));
// check to see if an image error occurred
PRBool imageFailedToLoad = PR_FALSE;
if (NS_FAILED(aStatus)) { // We failed to load the image. Notify the pres shell
PRBool lowFailed = PR_FALSE;
PRBool imageFailed = PR_FALSE;
// One of the two images didn't load, which one?
if (mLowImageRequest == aRequest || !mLowImageRequest) {
lowFailed = PR_TRUE;
}
if (mImageRequest == aRequest || !mImageRequest) {
imageFailed = PR_TRUE;
}
if (imageFailed && lowFailed)
imageFailedToLoad = PR_TRUE;
}
// if src failed and there is no lowsrc
// or both failed to load, then notify the PresShell
if (imageFailedToLoad && presShell) {
if (mFailureReplace) {
nsAutoString usemap;
mContent->GetAttr(kNameSpaceID_HTML, nsHTMLAtoms::usemap, usemap);
// We failed to load the image. Notify the pres shell if we aren't an image map
if (usemap.IsEmpty()) {
presShell->CantRenderReplacedElement(aPresContext, this);
}
}
mFailureReplace = PR_TRUE;
}
// After these DOM events are fired its possible that this frame may be deleted. As a result
// the code should not attempt to access any of the frames internal data after this point.
if (presShell) {
if (imageFailedToLoad) {
// Send error event
FireDOMEvent(NS_IMAGE_ERROR);
} else if (mCanSendLoadEvent) {
// Send load event
mCanSendLoadEvent = PR_FALSE;
FireDOMEvent(NS_IMAGE_LOAD);
}
}
return NS_OK;
}
NS_IMETHODIMP nsImageFrame::FrameChanged(imgIContainer *aContainer, nsIPresContext *aPresContext, gfxIImageFrame *aNewFrame, nsRect *aDirtyRect)
{
nsRect r(*aDirtyRect);
float p2t;
aPresContext->GetPixelsToTwips(&p2t);
r.x = NSIntPixelsToTwips(r.x, p2t);
r.y = NSIntPixelsToTwips(r.y, p2t);
r.width = NSIntPixelsToTwips(r.width, p2t);
r.height = NSIntPixelsToTwips(r.height, p2t);
mTransform.TransformCoord(&r.x, &r.y, &r.width, &r.height);
Invalidate(aPresContext, r, PR_FALSE);
return NS_OK;
}
#define MINMAX(_value,_min,_max) \
((_value) < (_min) \
? (_min) \
: ((_value) > (_max) \
? (_max) \
: (_value)))
void
nsImageFrame::GetDesiredSize(nsIPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nsHTMLReflowMetrics& aDesiredSize)
{
nscoord widthConstraint = NS_INTRINSICSIZE;
nscoord heightConstraint = NS_INTRINSICSIZE;
PRBool fixedContentWidth = PR_FALSE;
PRBool fixedContentHeight = PR_FALSE;
nscoord minWidth, maxWidth, minHeight, maxHeight;
// Determine whether the image has fixed content width
widthConstraint = aReflowState.mComputedWidth;
minWidth = aReflowState.mComputedMinWidth;
maxWidth = aReflowState.mComputedMaxWidth;
if (widthConstraint != NS_INTRINSICSIZE) {
fixedContentWidth = PR_TRUE;
}
// Determine whether the image has fixed content height
heightConstraint = aReflowState.mComputedHeight;
minHeight = aReflowState.mComputedMinHeight;
maxHeight = aReflowState.mComputedMaxHeight;
if (heightConstraint != NS_UNCONSTRAINEDSIZE) {
fixedContentHeight = PR_TRUE;
}
PRBool haveComputedSize = PR_FALSE;
PRBool needIntrinsicImageSize = PR_FALSE;
float t2p, sp2t;
aPresContext->GetTwipsToPixels(&t2p);
aPresContext->GetScaledPixelsToTwips(&sp2t);
// convert from normal twips to scaled twips (printing...)
float t2st = t2p*sp2t; // twips to scaled twips
nscoord intrinsicScaledWidth = NSToCoordRound(float(mIntrinsicSize.width) * t2st);
nscoord intrinsicScaledHeight = NSToCoordRound(float(mIntrinsicSize.height) * t2st);
nscoord newWidth=0, newHeight=0;
if (fixedContentWidth) {
newWidth = MINMAX(widthConstraint, minWidth, maxWidth);
if (fixedContentHeight) {
newHeight = MINMAX(heightConstraint, minHeight, maxHeight);
haveComputedSize = PR_TRUE;
} else {
// We have a width, and an auto height. Compute height from
// width once we have the intrinsic image size.
if (intrinsicScaledWidth != 0) {
newHeight = (intrinsicScaledHeight * newWidth) / intrinsicScaledWidth;
haveComputedSize = PR_TRUE;
} else {
newHeight = 0;
needIntrinsicImageSize = PR_TRUE;
}
}
} else if (fixedContentHeight) {
// We have a height, and an auto width. Compute width from height
// once we have the intrinsic image size.
newHeight = MINMAX(heightConstraint, minHeight, maxHeight);
if (intrinsicScaledHeight != 0) {
newWidth = (intrinsicScaledWidth * newHeight) / intrinsicScaledHeight;
haveComputedSize = PR_TRUE;
} else {
newWidth = 0;
needIntrinsicImageSize = PR_TRUE;
}
} else {
// auto size the image
if (mIntrinsicSize.width == 0 && mIntrinsicSize.height == 0)
needIntrinsicImageSize = PR_TRUE;
else
haveComputedSize = PR_TRUE;
newWidth = intrinsicScaledWidth;
newHeight = intrinsicScaledHeight;
}
mComputedSize.width = newWidth;
mComputedSize.height = newHeight;
if (mComputedSize == mIntrinsicSize) {
mTransform.SetToIdentity();
} else {
if (mIntrinsicSize.width != 0 && mIntrinsicSize.height != 0) {
mTransform.SetToScale(float(mComputedSize.width) / float(mIntrinsicSize.width),
float(mComputedSize.height) / float(mIntrinsicSize.height));
}
}
aDesiredSize.width = mComputedSize.width;
aDesiredSize.height = mComputedSize.height;
}
void
nsImageFrame::GetInnerArea(nsIPresContext* aPresContext,
nsRect& aInnerArea) const
{
aInnerArea.x = mBorderPadding.left;
aInnerArea.y = mBorderPadding.top;
aInnerArea.width = mRect.width -
(mBorderPadding.left + mBorderPadding.right);
aInnerArea.height = mRect.height -
(mBorderPadding.top + mBorderPadding.bottom);
}
NS_IMETHODIMP
nsImageFrame::Reflow(nsIPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsImageFrame", aReflowState.reason);
NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
("enter nsImageFrame::Reflow: availSize=%d,%d",
aReflowState.availableWidth, aReflowState.availableHeight));
NS_PRECONDITION(mState & NS_FRAME_IN_REFLOW, "frame is not in reflow");
// see if we have a frozen size (i.e. a fixed width and height)
HaveFixedSize(aReflowState, mSizeConstrained);
if (aReflowState.reason == eReflowReason_Initial)
mGotInitialReflow = PR_TRUE;
GetDesiredSize(aPresContext, aReflowState, aMetrics);
AddBordersAndPadding(aPresContext, aReflowState, aMetrics, mBorderPadding);
if (nsnull != aMetrics.maxElementSize) {
// If we have a percentage based width, then our MES width is 0
if (eStyleUnit_Percent == aReflowState.mStylePosition->mWidth.GetUnit()) {
aMetrics.maxElementSize->width = 0;
} else {
aMetrics.maxElementSize->width = aMetrics.width;
}
aMetrics.maxElementSize->height = aMetrics.height;
}
if (aMetrics.mFlags & NS_REFLOW_CALC_MAX_WIDTH) {
aMetrics.mMaximumWidth = aMetrics.width;
}
aStatus = NS_FRAME_COMPLETE;
NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
("exit nsImageFrame::Reflow: size=%d,%d",
aMetrics.width, aMetrics.height));
return NS_OK;
}
// Computes the width of the specified string. aMaxWidth specifies the maximum
// width available. Once this limit is reached no more characters are measured.
// The number of characters that fit within the maximum width are returned in
// aMaxFit. NOTE: it is assumed that the fontmetrics have already been selected
// into the rendering context before this is called (for performance). MMP
void
nsImageFrame::MeasureString(const PRUnichar* aString,
PRInt32 aLength,
nscoord aMaxWidth,
PRUint32& aMaxFit,
nsIRenderingContext& aContext)
{
nscoord totalWidth = 0;
nscoord spaceWidth;
aContext.GetWidth(' ', spaceWidth);
aMaxFit = 0;
while (aLength > 0) {
// Find the next place we can line break
PRUint32 len = aLength;
PRBool trailingSpace = PR_FALSE;
for (PRInt32 i = 0; i < aLength; i++) {
if (XP_IS_SPACE(aString[i]) && (i > 0)) {
len = i; // don't include the space when measuring
trailingSpace = PR_TRUE;
break;
}
}
// Measure this chunk of text, and see if it fits
nscoord width;
aContext.GetWidth(aString, len, width);
PRBool fits = (totalWidth + width) <= aMaxWidth;
// If it fits on the line, or it's the first word we've processed then
// include it
if (fits || (0 == totalWidth)) {
// New piece fits
totalWidth += width;
// If there's a trailing space then see if it fits as well
if (trailingSpace) {
if ((totalWidth + spaceWidth) <= aMaxWidth) {
totalWidth += spaceWidth;
} else {
// Space won't fit. Leave it at the end but don't include it in
// the width
fits = PR_FALSE;
}
len++;
}
aMaxFit += len;
aString += len;
aLength -= len;
}
if (!fits) {
break;
}
}
}
// Formats the alt-text to fit within the specified rectangle. Breaks lines
// between words if a word would extend past the edge of the rectangle
void
nsImageFrame::DisplayAltText(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsString& aAltText,
const nsRect& aRect)
{
const nsStyleColor* color =
(const nsStyleColor*)mStyleContext->GetStyleData(eStyleStruct_Color);
const nsStyleFont* font =
(const nsStyleFont*)mStyleContext->GetStyleData(eStyleStruct_Font);
// Set font and color
aRenderingContext.SetColor(color->mColor);
aRenderingContext.SetFont(font->mFont);
// Format the text to display within the formatting rect
nsIFontMetrics* fm;
aRenderingContext.GetFontMetrics(fm);
nscoord maxDescent, height;
fm->GetMaxDescent(maxDescent);
fm->GetHeight(height);
// XXX It would be nice if there was a way to have the font metrics tell
// use where to break the text given a maximum width. At a minimum we need
// to be able to get the break character...
const PRUnichar* str = aAltText.get();
PRInt32 strLen = aAltText.Length();
nscoord y = aRect.y;
while ((strLen > 0) && ((y + maxDescent) < aRect.YMost())) {
// Determine how much of the text to display on this line
PRUint32 maxFit; // number of characters that fit
MeasureString(str, strLen, aRect.width, maxFit, aRenderingContext);
// Display the text
aRenderingContext.DrawString(str, maxFit, aRect.x, y);
// Move to the next line
str += maxFit;
strLen -= maxFit;
y += height;
}
NS_RELEASE(fm);
}
struct nsRecessedBorder : public nsStyleBorder {
nsRecessedBorder(nscoord aBorderWidth)
: nsStyleBorder()
{
nsStyleCoord styleCoord(aBorderWidth);
mBorder.SetLeft(styleCoord);
mBorder.SetTop(styleCoord);
mBorder.SetRight(styleCoord);
mBorder.SetBottom(styleCoord);
mBorderStyle[0] = NS_STYLE_BORDER_STYLE_INSET;
mBorderStyle[1] = NS_STYLE_BORDER_STYLE_INSET;
mBorderStyle[2] = NS_STYLE_BORDER_STYLE_INSET;
mBorderStyle[3] = NS_STYLE_BORDER_STYLE_INSET;
mBorderColor[0] = 0;
mBorderColor[1] = 0;
mBorderColor[2] = 0;
mBorderColor[3] = 0;
mHasCachedBorder = PR_FALSE;
}
};
void
nsImageFrame::DisplayAltFeedback(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
PRInt32 aIconId)
{
// Calculate the inner area
nsRect inner;
GetInnerArea(aPresContext, inner);
// Display a recessed one pixel border
float p2t;
nscoord borderEdgeWidth;
aPresContext->GetScaledPixelsToTwips(&p2t);
borderEdgeWidth = NSIntPixelsToTwips(1, p2t);
// Make sure we have enough room to actually render the border within
// our frame bounds
if ((inner.width < 2 * borderEdgeWidth) || (inner.height < 2 * borderEdgeWidth)) {
return;
}
// Paint the border
nsRecessedBorder recessedBorder(borderEdgeWidth);
nsCSSRendering::PaintBorder(aPresContext, aRenderingContext, this, inner,
inner, recessedBorder, mStyleContext, 0);
// Adjust the inner rect to account for the one pixel recessed border,
// and a six pixel padding on each edge
inner.Deflate(NSIntPixelsToTwips(7, p2t), NSIntPixelsToTwips(7, p2t));
if (inner.IsEmpty()) {
return;
}
// Clip so we don't render outside the inner rect
PRBool clipState;
aRenderingContext.PushState();
aRenderingContext.SetClipRect(inner, nsClipCombine_kIntersect, clipState);
// Display the icon
#ifdef USE_IMG2
// XXX
#else
nsIDeviceContext* dc;
aRenderingContext.GetDeviceContext(dc);
nsIImage* icon;
if (NS_SUCCEEDED(dc->LoadIconImage(aIconId, icon)) && icon) {
aRenderingContext.DrawImage(icon, inner.x, inner.y);
// Reduce the inner rect by the width of the icon, and leave an
// additional six pixels padding
PRInt32 iconWidth = NSIntPixelsToTwips(icon->GetWidth() + 6, p2t);
inner.x += iconWidth;
inner.width -= iconWidth;
NS_RELEASE(icon);
}
NS_RELEASE(dc);
#endif
// If there's still room, display the alt-text
if (!inner.IsEmpty()) {
nsAutoString altText;
if (NS_CONTENT_ATTR_HAS_VALUE == mContent->GetAttr(kNameSpaceID_HTML, nsHTMLAtoms::alt, altText)) {
DisplayAltText(aPresContext, aRenderingContext, altText, inner);
}
}
aRenderingContext.PopState(clipState);
}
NS_METHOD
nsImageFrame::Paint(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer,
PRUint32 aFlags)
{
PRBool isVisible;
if (NS_SUCCEEDED(IsVisibleForPainting(aPresContext, aRenderingContext, PR_TRUE, &isVisible)) &&
isVisible && mRect.width && mRect.height) {
// If painting is suppressed, we need to stop image painting. We
// have to cover <img> here because of input image controls.
PRBool paintingSuppressed = PR_FALSE;
nsCOMPtr<nsIPresShell> shell;
aPresContext->GetShell(getter_AddRefs(shell));
shell->IsPaintingSuppressed(&paintingSuppressed);
if (paintingSuppressed)
return NS_OK;
// First paint background and borders
nsLeafFrame::Paint(aPresContext, aRenderingContext, aDirtyRect,
aWhichLayer);
nsCOMPtr<imgIContainer> imgCon;
nsCOMPtr<imgIContainer> lowImgCon;
if (mImageRequest) {
mImageRequest->GetImage(getter_AddRefs(imgCon));
}
if (mLowImageRequest) {
mLowImageRequest->GetImage(getter_AddRefs(lowImgCon));
}
PRUint32 loadStatus = imgIRequest::STATUS_ERROR;
if (mImageRequest) {
mImageRequest->GetImageStatus(&loadStatus);
}
if (loadStatus & imgIRequest::STATUS_ERROR || !(imgCon || lowImgCon)) {
// No image yet, or image load failed. Draw the alt-text and an icon
// indicating the status
if (NS_FRAME_PAINT_LAYER_BACKGROUND == aWhichLayer &&
!mInitialLoadCompleted) {
DisplayAltFeedback(aPresContext, aRenderingContext, 0);
#ifndef USE_IMG2
(loadStatus & imgIRequest::STATUS_ERROR)
? NS_ICON_BROKEN_IMAGE
: NS_ICON_LOADING_IMAGE);
#endif
}
}
else {
mInitialLoadCompleted = PR_TRUE;
if (NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer) {
// Now render the image into our content area (the area inside the
// borders and padding)
nsRect inner;
GetInnerArea(aPresContext, inner);
if (loadStatus & imgIRequest::STATUS_ERROR) {
if (imgCon) {
inner.SizeTo(mComputedSize);
} else if (lowImgCon) {
// XXX need to handle low image...
}
}
if (imgCon) {
nsPoint p(inner.x, inner.y);
if (mIntrinsicSize == mComputedSize) {
inner.IntersectRect(inner, aDirtyRect);
nsRect r(inner.x, inner.y, inner.width, inner.height);
r.x -= mBorderPadding.left;
r.y -= mBorderPadding.top;
aRenderingContext.DrawImage(imgCon, &r, &p);
} else {
nsTransform2D trans;
trans.SetToScale((float(mIntrinsicSize.width) / float(inner.width)),
(float(mIntrinsicSize.height) / float(inner.height)));
nsRect r(0, 0, inner.width, inner.height);
trans.TransformCoord(&r.x, &r.y, &r.width, &r.height);
nsRect d(inner.x, inner.y, mComputedSize.width, mComputedSize.height);
aRenderingContext.DrawScaledImage(imgCon, &r, &d);
}
}
}
nsImageMap* map = GetImageMap(aPresContext);
if (nsnull != map) {
nsRect inner;
GetInnerArea(aPresContext, inner);
PRBool clipState;
aRenderingContext.SetColor(NS_RGB(0, 0, 0));
aRenderingContext.SetLineStyle(nsLineStyle_kDotted);
aRenderingContext.PushState();
aRenderingContext.Translate(inner.x, inner.y);
map->Draw(aPresContext, aRenderingContext);
aRenderingContext.PopState(clipState);
}
#ifdef DEBUG
if ((NS_FRAME_PAINT_LAYER_DEBUG == aWhichLayer) &&
GetShowFrameBorders()) {
nsImageMap* map = GetImageMap(aPresContext);
if (nsnull != map) {
nsRect inner;
GetInnerArea(aPresContext, inner);
PRBool clipState;
aRenderingContext.SetColor(NS_RGB(0, 0, 0));
aRenderingContext.PushState();
aRenderingContext.Translate(inner.x, inner.y);
map->Draw(aPresContext, aRenderingContext);
aRenderingContext.PopState(clipState);
}
}
#endif
}
}
return nsFrame::Paint(aPresContext, aRenderingContext, aDirtyRect, aWhichLayer);
}
nsImageMap*
nsImageFrame::GetImageMap(nsIPresContext* aPresContext)
{
if (!mImageMap) {
nsCOMPtr<nsIDocument> doc;
mContent->GetDocument(*getter_AddRefs(doc));
if (!doc) {
return nsnull;
}
nsAutoString usemap;
mContent->GetAttr(kNameSpaceID_HTML, nsHTMLAtoms::usemap, usemap);
nsCOMPtr<nsIDOMHTMLMapElement> map;
if (NS_SUCCEEDED(nsImageMapUtils::FindImageMap(doc,usemap,getter_AddRefs(map))) && map) {
nsCOMPtr<nsIPresShell> presShell;
aPresContext->GetShell(getter_AddRefs(presShell));
mImageMap = new nsImageMap();
if (mImageMap) {
NS_ADDREF(mImageMap);
mImageMap->Init(presShell, this, map);
}
}
}
return mImageMap;
}
void
nsImageFrame::TriggerLink(nsIPresContext* aPresContext,
const nsString& aURLSpec,
const nsString& aTargetSpec,
PRBool aClick)
{
// We get here with server side image map
nsILinkHandler* handler = nsnull;
aPresContext->GetLinkHandler(&handler);
if (nsnull != handler) {
if (aClick) {
nsresult proceed = NS_OK;
// Check that this page is allowed to load this URI.
// Almost a copy of the similarly named method in nsGenericElement
nsresult rv;
nsCOMPtr<nsIScriptSecurityManager> securityManager =
do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID, &rv);
nsCOMPtr<nsIPresShell> ps;
if (NS_SUCCEEDED(rv))
rv = aPresContext->GetShell(getter_AddRefs(ps));
nsCOMPtr<nsIDocument> doc;
if (NS_SUCCEEDED(rv) && ps)
rv = ps->GetDocument(getter_AddRefs(doc));
nsCOMPtr<nsIURI> baseURI;
if (NS_SUCCEEDED(rv) && doc)
doc->GetDocumentURL(getter_AddRefs(baseURI));
nsCOMPtr<nsIURI> absURI;
if (NS_SUCCEEDED(rv))
rv = NS_NewURI(getter_AddRefs(absURI), aURLSpec, baseURI);
if (NS_SUCCEEDED(rv))
proceed = securityManager->CheckLoadURI(baseURI, absURI, nsIScriptSecurityManager::STANDARD);
// Only pass off the click event if the script security manager
// says it's ok.
if (NS_SUCCEEDED(proceed))
handler->OnLinkClick(mContent, eLinkVerb_Replace, aURLSpec.get(), aTargetSpec.get());
}
else {
handler->OnOverLink(mContent, aURLSpec.get(), aTargetSpec.get());
}
NS_RELEASE(handler);
}
}
PRBool
nsImageFrame::IsServerImageMap()
{
nsAutoString ismap;
return NS_CONTENT_ATTR_HAS_VALUE ==
mContent->GetAttr(kNameSpaceID_HTML, nsHTMLAtoms::ismap, ismap);
}
PRIntn
nsImageFrame::GetSuppress()
{
nsAutoString s;
if (NS_CONTENT_ATTR_HAS_VALUE ==
mContent->GetAttr(kNameSpaceID_HTML, nsHTMLAtoms::suppress, s)) {
if (s.EqualsIgnoreCase("true")) {
return SUPPRESS;
} else if (s.EqualsIgnoreCase("false")) {
return DONT_SUPPRESS;
}
}
return DEFAULT_SUPPRESS;
}
//XXX the event come's in in view relative coords, but really should
//be in frame relative coords by the time it hits our frame.
// Translate an point that is relative to our view (or a containing
// view) into a localized pixel coordinate that is relative to the
// content area of this frame (inside the border+padding).
void
nsImageFrame::TranslateEventCoords(nsIPresContext* aPresContext,
const nsPoint& aPoint,
nsPoint& aResult)
{
nscoord x = aPoint.x;
nscoord y = aPoint.y;
// If we have a view then the event coordinates are already relative
// to this frame; otherwise we have to adjust the coordinates
// appropriately.
nsIView* view;
GetView(aPresContext, &view);
if (nsnull == view) {
nsPoint offset;
GetOffsetFromView(aPresContext, offset, &view);
if (nsnull != view) {
x -= offset.x;
y -= offset.y;
}
}
// Subtract out border and padding here so that the coordinates are
// now relative to the content area of this frame.
nsRect inner;
GetInnerArea(aPresContext, inner);
x -= inner.x;
y -= inner.y;
// Translate the coordinates from twips to pixels
float t2p;
aPresContext->GetTwipsToPixels(&t2p);
aResult.x = NSTwipsToIntPixels(x, t2p);
aResult.y = NSTwipsToIntPixels(y, t2p);
}
PRBool
nsImageFrame::GetAnchorHREFAndTarget(nsString& aHref, nsString& aTarget)
{
PRBool status = PR_FALSE;
aHref.Truncate();
aTarget.Truncate();
// Walk up the content tree, looking for an nsIDOMAnchorElement
nsCOMPtr<nsIContent> content;
mContent->GetParent(*getter_AddRefs(content));
while (content) {
nsCOMPtr<nsIDOMHTMLAnchorElement> anchor(do_QueryInterface(content));
if (anchor) {
anchor->GetHref(aHref);
if (aHref.Length() > 0) {
status = PR_TRUE;
}
anchor->GetTarget(aTarget);
break;
}
nsCOMPtr<nsIContent> parent;
content->GetParent(*getter_AddRefs(parent));
content = parent;
}
return status;
}
NS_IMETHODIMP
nsImageFrame::CanContinueTextRun(PRBool& aContinueTextRun) const
{
// images really CAN continue text runs, but the textFrame needs to be
// educated before we can indicate that it can. For now, we handle the fixing up
// of max element widths in nsLineLayout::VerticalAlignFrames, but hopefully
// this can be eliminated and the textFrame can be convinced to handle inlines
// that take up space in text runs.
aContinueTextRun = PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP
nsImageFrame::GetContentForEvent(nsIPresContext* aPresContext,
nsEvent* aEvent,
nsIContent** aContent)
{
NS_ENSURE_ARG_POINTER(aContent);
nsImageMap* map;
map = GetImageMap(aPresContext);
if (nsnull != map) {
nsPoint p;
TranslateEventCoords(aPresContext, aEvent->point, p);
nsAutoString absURL, target, altText;
PRBool suppress;
PRBool inside = PR_FALSE;
nsCOMPtr<nsIContent> area;
inside = map->IsInside(p.x, p.y, getter_AddRefs(area),
absURL, target, altText,
&suppress);
if (inside && area) {
*aContent = area;
NS_ADDREF(*aContent);
return NS_OK;
}
}
return GetContent(aContent);
}
// XXX what should clicks on transparent pixels do?
NS_METHOD
nsImageFrame::HandleEvent(nsIPresContext* aPresContext,
nsGUIEvent* aEvent,
nsEventStatus* aEventStatus)
{
NS_ENSURE_ARG_POINTER(aEventStatus);
nsImageMap* map;
switch (aEvent->message) {
case NS_MOUSE_LEFT_BUTTON_UP:
case NS_MOUSE_MOVE:
{
map = GetImageMap(aPresContext);
PRBool isServerMap = IsServerImageMap();
if ((nsnull != map) || isServerMap) {
nsPoint p;
TranslateEventCoords(aPresContext, aEvent->point, p);
nsAutoString absURL, target, altText;
PRBool suppress;
PRBool inside = PR_FALSE;
// Even though client-side image map triggering happens
// through content, we need to make sure we're not inside
// (in case we deal with a case of both client-side and
// sever-side on the same image - it happens!)
if (nsnull != map) {
nsCOMPtr<nsIContent> area;
inside = map->IsInside(p.x, p.y, getter_AddRefs(area),
absURL, target, altText,
&suppress);
}
if (!inside && isServerMap) {
suppress = GetSuppress();
nsCOMPtr<nsIURI> baseURL;
GetBaseURI(getter_AddRefs(baseURL));
if (baseURL) {
// Server side image maps use the href in a containing anchor
// element to provide the basis for the destination url.
nsAutoString src;
if (GetAnchorHREFAndTarget(src, target)) {
NS_MakeAbsoluteURI(absURL, src, baseURL);
// XXX if the mouse is over/clicked in the border/padding area
// we should probably just pretend nothing happened. Nav4
// keeps the x,y coordinates positive as we do; IE doesn't
// bother. Both of them send the click through even when the
// mouse is over the border.
if (p.x < 0) p.x = 0;
if (p.y < 0) p.y = 0;
char cbuf[50];
PR_snprintf(cbuf, sizeof(cbuf), "?%d,%d", p.x, p.y);
absURL.AppendWithConversion(cbuf);
PRBool clicked = PR_FALSE;
if (aEvent->message == NS_MOUSE_LEFT_BUTTON_UP) {
*aEventStatus = nsEventStatus_eConsumeDoDefault;
clicked = PR_TRUE;
}
TriggerLink(aPresContext, absURL, target, clicked);
}
}
else
{
NS_WARNING("baseURL is null for imageFrame - ignoring mouse event");
}
}
}
break;
}
default:
break;
}
return nsLeafFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
}
//XXX This will need to be rewritten once we have content for areas
NS_METHOD
nsImageFrame::GetCursor(nsIPresContext* aPresContext,
nsPoint& aPoint,
PRInt32& aCursor)
{
nsImageMap* map = GetImageMap(aPresContext);
if (nsnull != map) {
nsPoint p;
TranslateEventCoords(aPresContext, aPoint, p);
aCursor = NS_STYLE_CURSOR_DEFAULT;
if (map->IsInside(p.x, p.y)) {
// Use style defined cursor if one is provided, otherwise when
// the cursor style is "auto" we use the pointer cursor.
const nsStyleUserInterface* styleUserInterface;
GetStyleData(eStyleStruct_UserInterface, (const nsStyleStruct*&)styleUserInterface);
aCursor = styleUserInterface->mCursor;
if (NS_STYLE_CURSOR_AUTO == aCursor) {
aCursor = NS_STYLE_CURSOR_POINTER;
}
}
return NS_OK;
}
return nsFrame::GetCursor(aPresContext, aPoint, aCursor);
}
NS_IMETHODIMP
nsImageFrame::AttributeChanged(nsIPresContext* aPresContext,
nsIContent* aChild,
PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aModType,
PRInt32 aHint)
{
nsresult rv = nsLeafFrame::AttributeChanged(aPresContext, aChild,
aNameSpaceID, aAttribute, aModType, aHint);
if (NS_OK != rv) {
return rv;
}
if (nsHTMLAtoms::src == aAttribute) {
nsAutoString newSRC;
aChild->GetAttr(kNameSpaceID_None, nsHTMLAtoms::src, newSRC);
PRUint32 loadStatus = imgIRequest::STATUS_ERROR;
if (mImageRequest)
mImageRequest->GetImageStatus(&loadStatus);
if (!(loadStatus & imgIRequest::STATUS_SIZE_AVAILABLE)) {
if (mImageRequest) {
mFailureReplace = PR_FALSE; // don't cause a CantRenderReplacedElement call
mImageRequest->Cancel(NS_ERROR_FAILURE);
mImageRequest = nsnull;
}
mCanSendLoadEvent = PR_TRUE;
}
LoadImage(newSRC, aPresContext, getter_AddRefs(mImageRequest));
}
else if (nsHTMLAtoms::width == aAttribute || nsHTMLAtoms::height == aAttribute)
{ // XXX: could check for new width == old width, and make that a no-op
nsCOMPtr<nsIPresShell> presShell;
aPresContext->GetShell(getter_AddRefs(presShell));
mState |= NS_FRAME_IS_DIRTY;
mParent->ReflowDirtyChild(presShell, (nsIFrame*) this);
// NOTE: mSizeFixed will be updated in Reflow...
}
return NS_OK;
}
NS_IMETHODIMP
nsImageFrame::GetFrameType(nsIAtom** aType) const
{
NS_PRECONDITION(nsnull != aType, "null OUT parameter pointer");
*aType = nsLayoutAtoms::imageFrame;
NS_ADDREF(*aType);
return NS_OK;
}
NS_IMETHODIMP
nsImageFrame::GetIntrinsicImageSize(nsSize& aSize)
{
aSize = mIntrinsicSize;
return NS_OK;
}
NS_IMETHODIMP
nsImageFrame::GetNaturalImageSize(PRUint32 *naturalWidth,
PRUint32 *naturalHeight)
{
*naturalWidth = 0;
*naturalHeight = 0;
if (mImageRequest) {
nsCOMPtr<imgIContainer> container;
mImageRequest->GetImage(getter_AddRefs(container));
if (container) {
PRInt32 w, h;
container->GetWidth(&w);
container->GetHeight(&h);
*naturalWidth = NS_STATIC_CAST(PRUint32, w);
*naturalHeight = NS_STATIC_CAST(PRUint32, h);
}
}
return NS_OK;
}
NS_IMETHODIMP
nsImageFrame::GetImageRequest(imgIRequest **aRequest)
{
*aRequest = mImageRequest;
NS_IF_ADDREF(*aRequest);
return NS_OK;
}
NS_IMETHODIMP
nsImageFrame::IsImageComplete(PRBool* aComplete)
{
NS_ENSURE_ARG_POINTER(aComplete);
if (!mImageRequest) {
*aComplete = PR_FALSE;
return NS_OK;
}
PRUint32 status;
mImageRequest->GetImageStatus(&status);
*aComplete = ((status & imgIRequest::STATUS_LOAD_COMPLETE) != 0);
return NS_OK;
}
void HaveFixedSize(const nsHTMLReflowState& aReflowState, PRPackedBool& aConstrainedSize)
{
// check the width and height values in the reflow state's style struct
// - if width and height are specified as either coord or percentage, then
// the size of the image frame is constrained
nsStyleUnit widthUnit = aReflowState.mStylePosition->mWidth.GetUnit();
nsStyleUnit heightUnit = aReflowState.mStylePosition->mHeight.GetUnit();
aConstrainedSize =
((widthUnit == eStyleUnit_Coord ||
widthUnit == eStyleUnit_Percent) &&
(heightUnit == eStyleUnit_Coord ||
heightUnit == eStyleUnit_Percent));
}
nsresult
nsImageFrame::LoadImage(const nsAReadableString& aSpec, nsIPresContext *aPresContext, imgIRequest **aRequest)
{
nsresult rv = NS_OK;
/* set this to TRUE here in case we return early */
mInitialLoadCompleted = PR_TRUE;
/* don't load the image if aSpec is empty */
if (aSpec.IsEmpty()) return NS_ERROR_FAILURE;
nsCOMPtr<nsIURI> realURI;
/* don't load the image if some security check fails... */
GetRealURI(aSpec, getter_AddRefs(realURI));
if (!CanLoadImage(realURI)) return NS_ERROR_FAILURE;
if (!mListener) {
nsImageListener *listener = new nsImageListener(this);
if (!listener) return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(listener);
listener->QueryInterface(NS_GET_IID(imgIDecoderObserver), getter_AddRefs(mListener));
NS_ASSERTION(mListener, "queryinterface for the listener failed");
NS_RELEASE(listener);
}
nsCOMPtr<imgILoader> il(do_GetService("@mozilla.org/image/loader;1", &rv));
if (NS_FAILED(rv)) return rv;
nsCOMPtr<nsILoadGroup> loadGroup;
GetLoadGroup(aPresContext, getter_AddRefs(loadGroup));
/* get the URI, convert internal-gopher-stuff if needed */
nsCOMPtr<nsIURI> uri;
GetURI(aSpec, getter_AddRefs(uri));
if (!uri)
uri = realURI;
/* set this back to FALSE before we do the real load */
mInitialLoadCompleted = PR_FALSE;
return il->LoadImage(uri, loadGroup, mListener, aPresContext, nsIRequest::LOAD_NORMAL, aRequest);
}
#define INTERNAL_GOPHER_LENGTH 16 /* "internal-gopher-" length */
void
nsImageFrame::GetURI(const nsAReadableString& aSpec, nsIURI **aURI)
{
*aURI = nsnull;
/* Note: navigator 4.* and earlier releases ignored the base tags
effect on the builtin images. So we do too. Use aSpec instead
of the absolute url...
*/
/* The prefix for special "internal" images that are well known.
Look and see if this is an internal-gopher- url.
*/
if (NS_LITERAL_STRING("internal-gopher-").Equals(Substring(aSpec, 0, INTERNAL_GOPHER_LENGTH))) {
nsAutoString newURI;
newURI.Assign(NS_LITERAL_STRING("resource:/res/html/gopher-") +
Substring(aSpec, INTERNAL_GOPHER_LENGTH, aSpec.Length() - INTERNAL_GOPHER_LENGTH) +
NS_LITERAL_STRING(".gif"));
GetRealURI(newURI, aURI);
}
}
void
nsImageFrame::GetRealURI(const nsAReadableString& aSpec, nsIURI **aURI)
{
nsCOMPtr<nsIURI> baseURI;
GetBaseURI(getter_AddRefs(baseURI));
NS_NewURI(aURI, aSpec, baseURI);
}
void
nsImageFrame::GetBaseURI(nsIURI **aURI)
{
NS_PRECONDITION(nsnull != aURI, "null OUT parameter pointer");
nsresult rv;
nsCOMPtr<nsIURI> baseURI;
nsCOMPtr<nsIHTMLContent> htmlContent(do_QueryInterface(mContent, &rv));
if (NS_SUCCEEDED(rv)) {
htmlContent->GetBaseURL(*getter_AddRefs(baseURI));
}
else {
nsCOMPtr<nsIDocument> doc;
if (mContent) {
rv = mContent->GetDocument(*getter_AddRefs(doc));
if (doc) {
doc->GetBaseURL(*getter_AddRefs(baseURI));
}
}
}
*aURI = baseURI;
NS_IF_ADDREF(*aURI);
}
void
nsImageFrame::GetLoadGroup(nsIPresContext *aPresContext, nsILoadGroup **aLoadGroup)
{
if (!aPresContext)
return;
NS_PRECONDITION(nsnull != aLoadGroup, "null OUT parameter pointer");
nsCOMPtr<nsIPresShell> shell;
aPresContext->GetShell(getter_AddRefs(shell));
if (!shell)
return;
nsCOMPtr<nsIDocument> doc;
shell->GetDocument(getter_AddRefs(doc));
if (!doc)
return;
doc->GetDocumentLoadGroup(aLoadGroup);
}
PRBool
nsImageFrame::CanLoadImage(nsIURI *aURI)
{
PRBool shouldLoad = PR_TRUE; // default permit
#if 0
nsCOMPtr<nsIScriptSecurityManager> securityManager(do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID));
if (securityManager) {
nsCOMPtr<nsIURI> baseURI;
GetBaseURI(getter_AddRefs(baseURI));
nsresult proceed = securityManager->CheckLoadURI(baseURI, aURI, nsIScriptSecurityManager::STANDARD);
if (NS_FAILED(proceed))
return PR_FALSE;
}
#endif
// Check with the content-policy things to make sure this load is permitted.
nsresult rv;
nsCOMPtr<nsIDOMElement> element(do_QueryInterface(mContent));
if (!element) // this would seem bad(tm)
return shouldLoad;
nsCOMPtr<nsIDocument> document;
if (mContent) {
rv = mContent->GetDocument(*getter_AddRefs(document));
if (! document) {
NS_ASSERTION(0, "expecting a document");
return shouldLoad;
}
nsCOMPtr<nsIScriptGlobalObject> globalScript;
rv = document->GetScriptGlobalObject(getter_AddRefs(globalScript));
if (NS_FAILED(rv)) return shouldLoad;
nsCOMPtr<nsIDOMWindow> domWin(do_QueryInterface(globalScript));
rv = NS_CheckContentLoadPolicy(nsIContentPolicy::IMAGE,
aURI, element, domWin, &shouldLoad);
if (NS_SUCCEEDED(rv) && !shouldLoad)
return shouldLoad;
}
/* ... additional checks ? */
return shouldLoad;
}
#ifdef DEBUG
NS_IMETHODIMP
nsImageFrame::SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const
{
#if 0
if (!aResult) {
return NS_ERROR_NULL_POINTER;
}
PRUint32 sum;
mImageLoader.SizeOf(aHandler, &sum);
sum += sizeof(*this) - sizeof(mImageLoader);
if (mImageMap) {
PRBool recorded;
aHandler->RecordObject((void*) mImageMap, &recorded);
if (!recorded) {
PRUint32 mapSize;
mImageMap->SizeOf(aHandler, &mapSize);
aHandler->AddSize(nsLayoutAtoms::imageMap, mapSize);
}
}
*aResult = sum;
#endif
*aResult = 0;
return NS_OK;
}
#endif
NS_IMPL_ISUPPORTS2(nsImageListener, imgIDecoderObserver, imgIContainerObserver)
nsImageListener::nsImageListener(nsImageFrame *aFrame) :
mFrame(aFrame)
{
NS_INIT_ISUPPORTS();
}
nsImageListener::~nsImageListener()
{
}
NS_IMETHODIMP nsImageListener::OnStartDecode(imgIRequest *aRequest, nsISupports *aContext)
{
if (!mFrame)
return NS_ERROR_FAILURE;
nsCOMPtr<nsIPresContext> pc(do_QueryInterface(aContext));
NS_ASSERTION(pc, "not a pres context!");
return mFrame->OnStartDecode(aRequest, pc);
}
NS_IMETHODIMP nsImageListener::OnStartContainer(imgIRequest *aRequest, nsISupports *aContext, imgIContainer *aImage)
{
if (!mFrame)
return NS_ERROR_FAILURE;
nsCOMPtr<nsIPresContext> pc(do_QueryInterface(aContext));
NS_ASSERTION(pc, "not a pres context!");
return mFrame->OnStartContainer(aRequest, pc, aImage);
}
NS_IMETHODIMP nsImageListener::OnStartFrame(imgIRequest *aRequest, nsISupports *aContext, gfxIImageFrame *aFrame)
{
if (!mFrame)
return NS_ERROR_FAILURE;
nsCOMPtr<nsIPresContext> pc(do_QueryInterface(aContext));
NS_ASSERTION(pc, "not a pres context!");
return mFrame->OnStartFrame(aRequest, pc, aFrame);
}
NS_IMETHODIMP nsImageListener::OnDataAvailable(imgIRequest *aRequest, nsISupports *aContext, gfxIImageFrame *aFrame, const nsRect *aRect)
{
if (!mFrame)
return NS_ERROR_FAILURE;
nsCOMPtr<nsIPresContext> pc(do_QueryInterface(aContext));
NS_ASSERTION(pc, "not a pres context!");
return mFrame->OnDataAvailable(aRequest, pc, aFrame, aRect);
}
NS_IMETHODIMP nsImageListener::OnStopFrame(imgIRequest *aRequest, nsISupports *aContext, gfxIImageFrame *aFrame)
{
if (!mFrame)
return NS_ERROR_FAILURE;
nsCOMPtr<nsIPresContext> pc(do_QueryInterface(aContext));
NS_ASSERTION(pc, "not a pres context!");
return mFrame->OnStopFrame(aRequest, pc, aFrame);
}
NS_IMETHODIMP nsImageListener::OnStopContainer(imgIRequest *aRequest, nsISupports *aContext, imgIContainer *aImage)
{
if (!mFrame)
return NS_ERROR_FAILURE;
nsCOMPtr<nsIPresContext> pc(do_QueryInterface(aContext));
NS_ASSERTION(pc, "not a pres context!");
return mFrame->OnStopContainer(aRequest, pc, aImage);
}
NS_IMETHODIMP nsImageListener::OnStopDecode(imgIRequest *aRequest, nsISupports *aContext, nsresult status, const PRUnichar *statusArg)
{
if (!mFrame)
return NS_ERROR_FAILURE;
nsCOMPtr<nsIPresContext> pc(do_QueryInterface(aContext));
NS_ASSERTION(pc, "not a pres context!");
return mFrame->OnStopDecode(aRequest, pc, status, statusArg);
}
NS_IMETHODIMP nsImageListener::FrameChanged(imgIContainer *aContainer, nsISupports *aContext, gfxIImageFrame *newframe, nsRect * dirtyRect)
{
if (!mFrame)
return NS_ERROR_FAILURE;
nsCOMPtr<nsIPresContext> pc(do_QueryInterface(aContext));
NS_ASSERTION(pc, "not a pres context!");
return mFrame->FrameChanged(aContainer, pc, newframe, dirtyRect);
}
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