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RetroZilla/layout/generic/nsImageFrame.cpp
Ryan Nematz 2f2ae146c0 first commit
2015-10-20 23:03:22 -04:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsHTMLParts.h"
#include "nsCOMPtr.h"
#include "nsImageFrame.h"
#include "nsIImageLoadingContent.h"
#include "nsString.h"
#include "nsPrintfCString.h"
#include "nsPresContext.h"
#include "nsIRenderingContext.h"
#include "nsIPresShell.h"
#include "nsIImage.h"
#include "nsIWidget.h"
#include "nsHTMLAtoms.h"
#include "nsIDocument.h"
#include "nsINodeInfo.h"
#include "nsContentUtils.h"
#include "nsStyleContext.h"
#include "nsStyleConsts.h"
#include "nsImageMap.h"
#include "nsILinkHandler.h"
#include "nsIURL.h"
#include "nsIIOService.h"
#include "nsIURL.h"
#include "nsILoadGroup.h"
#include "nsISupportsPriority.h"
#include "nsIServiceManager.h"
#include "nsNetUtil.h"
#include "nsIView.h"
#include "nsIViewManager.h"
#include "nsHTMLContainerFrame.h"
#include "prprf.h"
#include "nsIFontMetrics.h"
#include "nsCSSRendering.h"
#include "nsILink.h"
#include "nsIDOMHTMLAnchorElement.h"
#include "nsIDOMHTMLImageElement.h"
#include "nsIDeviceContext.h"
#include "nsINameSpaceManager.h"
#include "nsTextFragment.h"
#include "nsIDOMHTMLMapElement.h"
#include "nsLayoutAtoms.h"
#include "nsImageMapUtils.h"
#include "nsIScriptSecurityManager.h"
#ifdef ACCESSIBILITY
#include "nsIAccessibilityService.h"
#endif
#include "nsIServiceManager.h"
#include "nsIDOMNode.h"
#include "nsGUIEvent.h"
#include "nsStyleSet.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"
#include "nsCSSFrameConstructor.h"
#include "nsIPrefBranch2.h"
#include "nsIPrefService.h"
#include "gfxIImageFrame.h"
#include "nsIDOMRange.h"
#include "nsIContentPolicy.h"
#include "nsContentPolicyUtils.h"
#include "nsLayoutErrors.h"
#ifdef DEBUG
#undef NOISY_IMAGE_LOADING
#undef NOISY_ICON_LOADING
#else
#undef NOISY_IMAGE_LOADING
#undef NOISY_ICON_LOADING
#endif
// sizes (pixels) for image icon, padding and border frame
#define ICON_SIZE (16)
#define ICON_PADDING (3)
#define ALT_BORDER_WIDTH (1)
//we must add hooks soon
#define IMAGE_EDITOR_CHECK 1
// Default alignment value (so we can tell an unset value from a set value)
#define ALIGN_UNSET PRUint8(-1)
// static icon information
nsImageFrame::IconLoad* nsImageFrame::gIconLoad = nsnull;
// cached IO service for loading icons
nsIIOService* nsImageFrame::sIOService;
// test if the width and height are fixed, looking at the style data
static PRBool HaveFixedSize(const nsStylePosition* aStylePosition)
{
// 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 = aStylePosition->mWidth.GetUnit();
nsStyleUnit heightUnit = aStylePosition->mHeight.GetUnit();
return ((widthUnit == eStyleUnit_Coord ||
widthUnit == eStyleUnit_Percent) &&
(heightUnit == eStyleUnit_Coord ||
heightUnit == eStyleUnit_Percent));
}
// 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
inline PRBool HaveFixedSize(const nsHTMLReflowState& aReflowState)
{
NS_ASSERTION(aReflowState.mStylePosition, "crappy reflowState - null stylePosition");
// when an image has percent css style height or width, but mComputedHeight
// or mComputedWidth of reflow state is NS_UNCONSTRAINEDSIZE
// it needs to return PR_FALSE to cause an incremental reflow later
// if an image is inside table like bug 156731 simple testcase III,
// during pass 1 reflow, mComputedWidth is NS_UNCONSTRAINEDSIZE
// in pass 2 reflow, mComputedWidth is 0, it also needs to return PR_FALSE
// see bug 156731
nsStyleUnit heightUnit = (*(aReflowState.mStylePosition)).mHeight.GetUnit();
nsStyleUnit widthUnit = (*(aReflowState.mStylePosition)).mWidth.GetUnit();
return ((eStyleUnit_Percent == heightUnit && NS_UNCONSTRAINEDSIZE == aReflowState.mComputedHeight) ||
(eStyleUnit_Percent == widthUnit && (NS_UNCONSTRAINEDSIZE == aReflowState.mComputedWidth ||
0 == aReflowState.mComputedWidth)))
? PR_FALSE
: HaveFixedSize(aReflowState.mStylePosition);
}
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() :
mComputedSize(0, 0),
mIntrinsicSize(0, 0)
{
// We assume our size is not constrained and we haven't gotten an
// initial reflow yet, so don't touch those flags.
}
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(nsPresContext* 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);
}
// set the frame to null so we don't send messages to a dead object.
if (mListener) {
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mContent);
if (imageLoader) {
imageLoader->RemoveObserver(mListener);
}
NS_REINTERPRET_CAST(nsImageListener*, mListener.get())->SetFrame(nsnull);
}
mListener = nsnull;
return nsSplittableFrame::Destroy(aPresContext);
}
NS_IMETHODIMP
nsImageFrame::Init(nsPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsStyleContext* aContext,
nsIFrame* aPrevInFlow)
{
nsresult rv = nsSplittableFrame::Init(aPresContext, aContent, aParent,
aContext, aPrevInFlow);
NS_ENSURE_SUCCESS(rv, rv);
mListener = new nsImageListener(this);
if (!mListener) return NS_ERROR_OUT_OF_MEMORY;
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(aContent);
NS_ENSURE_TRUE(imageLoader, NS_ERROR_UNEXPECTED);
imageLoader->AddObserver(mListener);
if (!gIconLoad)
LoadIcons(aPresContext);
nsCOMPtr<imgIRequest> currentRequest;
imageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(currentRequest));
PRUint32 currentLoadStatus = imgIRequest::STATUS_ERROR;
if (currentRequest) {
currentRequest->GetImageStatus(&currentLoadStatus);
// Give image loads associated with an image frame a small priority boost!
nsCOMPtr<nsISupportsPriority> p = do_QueryInterface(currentRequest);
if (p)
p->AdjustPriority(-1);
}
if (currentLoadStatus & imgIRequest::STATUS_ERROR) {
PRInt16 imageStatus = nsIContentPolicy::ACCEPT;
imageLoader->GetImageBlockingStatus(&imageStatus);
rv = HandleLoadError(imageStatus);
}
// If we already have an image container, OnStartContainer won't be called
// Set the animation mode here
if (currentRequest) {
nsCOMPtr<imgIContainer> image;
currentRequest->GetImage(getter_AddRefs(image));
if (image) {
image->SetAnimationMode(aPresContext->ImageAnimationMode());
// Ensure the animation (if any) is started.
image->StartAnimation();
}
}
return rv;
}
PRBool
nsImageFrame::RecalculateTransform(imgIContainer* aImage)
{
PRBool intrinsicSizeChanged = PR_FALSE;
if (aImage) {
float p2t;
p2t = GetPresContext()->PixelsToTwips();
nsSize imageSizeInPx;
aImage->GetWidth(&imageSizeInPx.width);
aImage->GetHeight(&imageSizeInPx.height);
nsSize newSize(NSIntPixelsToTwips(imageSizeInPx.width, p2t),
NSIntPixelsToTwips(imageSizeInPx.height, p2t));
if (mIntrinsicSize != newSize) {
intrinsicSizeChanged = PR_TRUE;
mIntrinsicSize = newSize;
}
}
// In any case, we need to translate this over appropriately. Set
// translation _before_ setting scaling so that it does not get
// scaled!
// XXXbz does this introduce rounding errors because of the cast to
// float? Should we just manually add that stuff in every time
// instead?
mTransform.SetToTranslate(float(mBorderPadding.left),
float(mBorderPadding.top - GetContinuationOffset()));
// Set the scale factors
if (mIntrinsicSize.width != 0 && mIntrinsicSize.height != 0 &&
mIntrinsicSize != mComputedSize) {
mTransform.AddScale(float(mComputedSize.width) / float(mIntrinsicSize.width),
float(mComputedSize.height) / float(mIntrinsicSize.height));
}
return intrinsicSizeChanged;
}
/*
* These two functions basically do the same check. The first one
* checks that the given request is the current request for our
* mContent. The second checks that the given image container the
* same as the image container on the current request for our
* mContent.
*/
PRBool
nsImageFrame::IsPendingLoad(imgIRequest* aRequest) const
{
// Default to pending load in case of errors
nsCOMPtr<nsIImageLoadingContent> imageLoader(do_QueryInterface(mContent));
NS_ASSERTION(imageLoader, "No image loading content?");
PRInt32 requestType = nsIImageLoadingContent::UNKNOWN_REQUEST;
imageLoader->GetRequestType(aRequest, &requestType);
return requestType != nsIImageLoadingContent::CURRENT_REQUEST;
}
PRBool
nsImageFrame::IsPendingLoad(imgIContainer* aContainer) const
{
// default to pending load in case of errors
if (!aContainer) {
NS_ERROR("No image container!");
return PR_TRUE;
}
nsCOMPtr<nsIImageLoadingContent> imageLoader(do_QueryInterface(mContent));
NS_ASSERTION(imageLoader, "No image loading content?");
nsCOMPtr<imgIRequest> currentRequest;
imageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(currentRequest));
if (!currentRequest) {
NS_ERROR("No current request");
return PR_TRUE;
}
nsCOMPtr<imgIContainer> currentContainer;
currentRequest->GetImage(getter_AddRefs(currentContainer));
return currentContainer != aContainer;
}
nsRect
nsImageFrame::SourceRectToDest(const nsRect& aRect)
{
float p2t = GetPresContext()->PixelsToTwips();
// When scaling the image, row N of the source image may (depending on
// the scaling function) be used to draw any row in the destination image
// between floor(F * (N-1)) and ceil(F * (N+1)), where F is the
// floating-point scaling factor. The same holds true for columns.
// So, we start by computing that bound without the floor and ceiling.
nsRect r(NSIntPixelsToTwips(aRect.x - 1, p2t),
NSIntPixelsToTwips(aRect.y - 1, p2t),
NSIntPixelsToTwips(aRect.width + 2, p2t),
NSIntPixelsToTwips(aRect.height + 2, p2t));
mTransform.TransformCoord(&r.x, &r.y, &r.width, &r.height);
// Now, round the edges out to the pixel boundary.
int scale = (int) p2t;
nscoord right = r.x + r.width;
nscoord bottom = r.y + r.height;
r.x -= (scale + (r.x % scale)) % scale;
r.y -= (scale + (r.y % scale)) % scale;
r.width = right + ((scale - (right % scale)) % scale) - r.x;
r.height = bottom + ((scale - (bottom % scale)) % scale) - r.y;
return r;
}
nsresult
nsImageFrame::HandleLoadError(PRInt16 aImageStatus)
{
if (!NS_CP_ACCEPTED(aImageStatus) &&
aImageStatus == nsIContentPolicy::REJECT_SERVER) {
// Don't display any alt feedback in this case; we're blocking images
// from that site and don't care to see anything from them
return NS_OK;
}
// If we have an image map, don't do anything here
// XXXbz Why? This is what the code used to do, but there's no good
// reason for it....
nsAutoString usemap;
mContent->GetAttr(kNameSpaceID_None, nsHTMLAtoms::usemap, usemap);
if (!usemap.IsEmpty()) {
return NS_OK;
}
nsPresContext* presContext = GetPresContext();
// Check if we want to use a placeholder box with an icon or just
// let the the presShell make us into inline text. Decide as follows:
//
// - if our special "force icons" style is set, show an icon
// - else if our "do not show placeholders" pref is set, skip the icon
// - else:
// - if QuirksMode, and there is no alt attribute, and this is not an
// <object> (which could not possibly have such an attribute), show an
// icon.
// - if QuirksMode, and the IMG has a size, and the image is
// broken, not blocked, show an icon.
// - otherwise, skip the icon
PRBool useSizedBox;
const nsStyleUIReset* uiResetData = GetStyleUIReset();
if (uiResetData->mForceBrokenImageIcon) {
useSizedBox = PR_TRUE;
}
else if (gIconLoad && gIconLoad->mPrefForceInlineAltText) {
useSizedBox = PR_FALSE;
}
else {
if (presContext->CompatibilityMode() != eCompatibility_NavQuirks) {
useSizedBox = PR_FALSE;
}
else {
// We are in quirks mode, so we can just check the tag name; no need to
// check the namespace.
nsINodeInfo *nodeInfo = mContent->GetNodeInfo();
if (!mContent->HasAttr(kNameSpaceID_None, nsHTMLAtoms::alt) &&
nodeInfo &&
!nodeInfo->Equals(nsHTMLAtoms::object)) {
useSizedBox = PR_TRUE;
}
else if (!NS_CP_ACCEPTED(aImageStatus)) {
useSizedBox = PR_FALSE;
}
else {
// check whether we have fixed size
useSizedBox = HaveFixedSize(GetStylePosition());
}
}
}
if (!useSizedBox) {
// let the presShell handle converting this into the inline alt
// text frame
nsIFrame* primaryFrame = nsnull;
if (mContent->IsContentOfType(nsIContent::eHTML) &&
(mContent->Tag() == nsHTMLAtoms::object ||
mContent->Tag() == nsHTMLAtoms::embed)) {
// We have to try to get the primary frame for mContent, since for
// <object> the frame CantRenderReplacedElement wants is the
// ObjectFrame, not us (we're an anonymous frame then)....
presContext->PresShell()->GetPrimaryFrameFor(mContent, &primaryFrame);
}
if (!primaryFrame) {
primaryFrame = this;
}
presContext->PresShell()->CantRenderReplacedElement(primaryFrame);
return NS_ERROR_FRAME_REPLACED;
}
// we are handling it
// invalidate the icon area (it may change states)
InvalidateIcon();
return NS_OK;
}
nsresult
nsImageFrame::OnStartContainer(imgIRequest *aRequest, imgIContainer *aImage)
{
if (!aImage) return NS_ERROR_INVALID_ARG;
// handle iconLoads first...
if (HandleIconLoads(aRequest, PR_FALSE)) {
return NS_OK;
}
/* Get requested animation policy from the pres context:
* normal = 0
* one frame = 1
* one loop = 2
*/
nsPresContext *presContext = GetPresContext();
aImage->SetAnimationMode(presContext->ImageAnimationMode());
// Ensure the animation (if any) is started.
aImage->StartAnimation();
if (IsPendingLoad(aRequest)) {
// We don't care
return NS_OK;
}
RecalculateTransform(aImage);
// Now we need to reflow if we have an unconstrained size and have
// already gotten the initial reflow
if (!(mState & IMAGE_SIZECONSTRAINED) && (mState & IMAGE_GOTINITIALREFLOW)) {
nsIPresShell *presShell = presContext->GetPresShell();
NS_ASSERTION(mParent, "No parent to pass the reflow request up to.");
NS_ASSERTION(presShell, "No PresShell.");
if (mParent && presShell) {
mState |= NS_FRAME_IS_DIRTY;
mParent->ReflowDirtyChild(presShell, NS_STATIC_CAST(nsIFrame*, this));
}
}
return NS_OK;
}
nsresult
nsImageFrame::OnDataAvailable(imgIRequest *aRequest,
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?
NS_ENSURE_ARG_POINTER(aRect);
if (!(mState & IMAGE_GOTINITIALREFLOW)) {
// Don't bother to do anything; we have a reflow coming up!
return NS_OK;
}
// handle iconLoads first...
if (HandleIconLoads(aRequest, PR_FALSE)) {
// Image changed, invalidate
Invalidate(*aRect, PR_FALSE);
return NS_OK;
}
if (IsPendingLoad(aRequest)) {
// We don't care
return NS_OK;
}
// Don't invalidate if the current visible frame isn't the one the data is
// from
nsCOMPtr<imgIContainer> container;
aRequest->GetImage(getter_AddRefs(container));
if (container) {
nsCOMPtr<gfxIImageFrame> currentFrame;
container->GetCurrentFrame(getter_AddRefs(currentFrame));
if (aFrame != currentFrame) {
// just bail
return NS_OK;
}
}
nsRect r = SourceRectToDest(*aRect);
#ifdef DEBUG_decode
printf("Source rect (%d,%d,%d,%d) -> invalidate dest rect (%d,%d,%d,%d)\n",
aRect->x, aRect->y, aRect->width, aRect->height,
r.x, r.y, r.width, r.height);
#endif
Invalidate(r, PR_FALSE);
return NS_OK;
}
nsresult
nsImageFrame::OnStopDecode(imgIRequest *aRequest,
nsresult aStatus,
const PRUnichar *aStatusArg)
{
nsPresContext *presContext = GetPresContext();
nsIPresShell *presShell = presContext->GetPresShell();
NS_ASSERTION(presShell, "No PresShell.");
// handle iconLoads first...
if (HandleIconLoads(aRequest, NS_SUCCEEDED(aStatus))) {
return NS_OK;
}
// Check what request type we're dealing with
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mContent);
NS_ASSERTION(imageLoader, "Who's notifying us??");
PRInt32 loadType = nsIImageLoadingContent::UNKNOWN_REQUEST;
imageLoader->GetRequestType(aRequest, &loadType);
if (loadType != nsIImageLoadingContent::CURRENT_REQUEST &&
loadType != nsIImageLoadingContent::PENDING_REQUEST) {
return NS_ERROR_FAILURE;
}
if (loadType == nsIImageLoadingContent::PENDING_REQUEST) {
// May have to switch sizes here!
PRBool intrinsicSizeChanged = PR_TRUE;
if (NS_SUCCEEDED(aStatus)) {
nsCOMPtr<imgIContainer> imageContainer;
aRequest->GetImage(getter_AddRefs(imageContainer));
NS_ASSERTION(imageContainer, "Successful load with no container?");
intrinsicSizeChanged = RecalculateTransform(imageContainer);
}
else {
// Have to size to 0,0 so that GetDesiredSize recalculates the size
mIntrinsicSize.SizeTo(0, 0);
}
if (mState & IMAGE_GOTINITIALREFLOW) { // do nothing if we havn't gotten the inital reflow yet
if (!(mState & IMAGE_SIZECONSTRAINED) && intrinsicSizeChanged) {
NS_ASSERTION(mParent, "No parent to pass the reflow request up to.");
if (mParent && presShell) {
mState |= NS_FRAME_IS_DIRTY;
mParent->ReflowDirtyChild(presShell, NS_STATIC_CAST(nsIFrame*, this));
}
} else {
nsSize s = GetSize();
nsRect r(0, 0, s.width, s.height);
// Update border+content to account for image change
Invalidate(r, PR_FALSE);
}
}
}
// if src failed to load, determine how to handle it:
// - either render the ALT text in this frame, or let the presShell
// handle it
if (NS_FAILED(aStatus) && aStatus != NS_ERROR_IMAGE_SRC_CHANGED) {
PRInt16 imageStatus = nsIContentPolicy::ACCEPT;
imageLoader->GetImageBlockingStatus(&imageStatus);
HandleLoadError(imageStatus);
}
return NS_OK;
}
nsresult
nsImageFrame::FrameChanged(imgIContainer *aContainer,
gfxIImageFrame *aNewFrame,
nsRect *aDirtyRect)
{
if (!GetStyleVisibility()->IsVisible()) {
return NS_OK;
}
if (IsPendingLoad(aContainer)) {
// We don't care about it
return NS_OK;
}
nsRect r = SourceRectToDest(*aDirtyRect);
// Update border+content to account for image change
Invalidate(r, PR_FALSE);
return NS_OK;
}
#define MINMAX(_value,_min,_max) \
((_value) < (_min) \
? (_min) \
: ((_value) > (_max) \
? (_max) \
: (_value)))
void
nsImageFrame::GetDesiredSize(nsPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nsHTMLReflowMetrics& aDesiredSize)
{
// if mIntrinsicSize.width and height are 0, then we should
// check to see if the size is already known by the image container.
if (mIntrinsicSize.width == 0 && mIntrinsicSize.height == 0) {
nsCOMPtr<imgIRequest> currentRequest;
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mContent);
if (imageLoader) {
imageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(currentRequest));
}
nsCOMPtr<imgIContainer> currentContainer;
if (currentRequest) {
currentRequest->GetImage(getter_AddRefs(currentContainer));
}
float p2t;
p2t = aPresContext->PixelsToTwips();
if (currentContainer) {
RecalculateTransform(currentContainer);
} else {
// image request is null or image size not known, probably an
// invalid image specified
// - make the image big enough for the icon (it may not be
// used if inline alt expansion is used instead)
// XXX: we need this in composer, but it is also good for
// XXX: general quirks mode to always have room for the icon
if (aPresContext->CompatibilityMode() == eCompatibility_NavQuirks) {
mIntrinsicSize.SizeTo(NSIntPixelsToTwips(ICON_SIZE+(2*(ICON_PADDING+ALT_BORDER_WIDTH)), p2t),
NSIntPixelsToTwips(ICON_SIZE+(2*(ICON_PADDING+ALT_BORDER_WIDTH)), p2t));
}
RecalculateTransform(nsnull);
}
}
// Handle intrinsic sizes and their interaction with
// {min-,max-,}{width,height} according to the rules in
// http://www.w3.org/TR/CSS21/visudet.html#min-max-widths
// Note: throughout the following section of the function, I avoid
// a * (b / c) because of its reduced accuracy relative to a * b / c
// or (a * b) / c (which are equivalent).
// convert from normal twips to scaled twips (printing...)
float t2st = aPresContext->TwipsToPixels() *
aPresContext->ScaledPixelsToTwips(); // twips to scaled twips
nscoord intrinsicWidth =
NSToCoordRound(float(mIntrinsicSize.width) * t2st);
nscoord intrinsicHeight =
NSToCoordRound(float(mIntrinsicSize.height) * t2st);
// Determine whether the image has fixed content width
nscoord width = aReflowState.mComputedWidth;
nscoord minWidth = aReflowState.mComputedMinWidth;
nscoord maxWidth = aReflowState.mComputedMaxWidth;
// Determine whether the image has fixed content height
nscoord height = aReflowState.mComputedHeight;
nscoord minHeight = aReflowState.mComputedMinHeight;
nscoord maxHeight = aReflowState.mComputedMaxHeight;
PRBool isAutoWidth = width == NS_INTRINSICSIZE;
PRBool isAutoHeight = height == NS_UNCONSTRAINEDSIZE;
if (isAutoWidth) {
if (isAutoHeight) {
// 'auto' width, 'auto' height
// XXX nsHTMLReflowState should already ensure this
if (minWidth > maxWidth)
maxWidth = minWidth;
if (minHeight > maxHeight)
maxHeight = minHeight;
nscoord heightAtMaxWidth, heightAtMinWidth,
widthAtMaxHeight, widthAtMinHeight;
if (intrinsicWidth > 0) {
heightAtMaxWidth = maxWidth * intrinsicHeight / intrinsicWidth;
if (heightAtMaxWidth < minHeight)
heightAtMaxWidth = minHeight;
heightAtMinWidth = minWidth * intrinsicHeight / intrinsicWidth;
if (heightAtMinWidth > maxHeight)
heightAtMinWidth = maxHeight;
} else {
heightAtMaxWidth = intrinsicHeight;
heightAtMinWidth = intrinsicHeight;
}
if (intrinsicHeight > 0) {
widthAtMaxHeight = maxHeight * intrinsicWidth / intrinsicHeight;
if (widthAtMaxHeight < minWidth)
widthAtMaxHeight = minWidth;
widthAtMinHeight = minHeight * intrinsicWidth / intrinsicHeight;
if (widthAtMinHeight > maxWidth)
widthAtMinHeight = maxWidth;
} else {
widthAtMaxHeight = intrinsicWidth;
widthAtMinHeight = intrinsicWidth;
}
if (intrinsicWidth > maxWidth) {
if (intrinsicHeight > maxHeight) {
if (maxWidth * intrinsicHeight <= maxHeight * intrinsicWidth) {
width = maxWidth;
height = heightAtMaxWidth;
} else {
height = maxHeight;
width = widthAtMaxHeight;
}
} else {
width = maxWidth;
height = heightAtMaxWidth;
}
} else if (intrinsicWidth < minWidth) {
if (intrinsicHeight < minHeight) {
if (minWidth * intrinsicHeight <= minHeight * intrinsicWidth) {
height = minHeight;
width = widthAtMinHeight;
} else {
width = minWidth;
height = heightAtMinWidth;
}
} else {
width = minWidth;
height = heightAtMinWidth;
}
} else {
if (intrinsicHeight > maxHeight) {
height = maxHeight;
width = widthAtMaxHeight;
} else if (intrinsicHeight < minHeight) {
height = minHeight;
width = widthAtMinHeight;
} else {
width = intrinsicWidth;
height = intrinsicHeight;
}
}
} else {
// 'auto' width, non-'auto' height
// XXX nsHTMLReflowState should already ensure this
height = MINMAX(height, minHeight, maxHeight);
if (intrinsicHeight != 0) {
width = intrinsicWidth * height / intrinsicHeight;
} else {
width = intrinsicWidth;
}
width = MINMAX(width, minWidth, maxWidth);
}
} else {
if (isAutoHeight) {
// non-'auto' width, 'auto' height
// XXX nsHTMLReflowState should already ensure this
width = MINMAX(width, minWidth, maxWidth);
if (intrinsicWidth != 0) {
height = intrinsicHeight * width / intrinsicWidth;
} else {
height = intrinsicHeight;
}
height = MINMAX(height, minHeight, maxHeight);
} else {
// non-'auto' width, non-'auto' height
// XXX nsHTMLReflowState should already ensure this
height = MINMAX(height, minHeight, maxHeight);
// XXX nsHTMLReflowState should already ensure this
width = MINMAX(width, minWidth, maxWidth);
}
}
if (mComputedSize.width != width || mComputedSize.height != height) {
mComputedSize.SizeTo(width, height);
RecalculateTransform(nsnull);
}
aDesiredSize.width = mComputedSize.width;
aDesiredSize.height = mComputedSize.height;
}
nsRect
nsImageFrame::GetInnerArea() const
{
nsRect r;
r.x = mBorderPadding.left;
r.y = mPrevInFlow ? 0 : mBorderPadding.top;
r.width = mRect.width - mBorderPadding.left - mBorderPadding.right;
r.height = mRect.height -
(mPrevInFlow ? 0 : mBorderPadding.top) -
(mNextInFlow ? 0 : mBorderPadding.bottom);
return r;
}
// get the offset into the content area of the image where aImg starts if it is a continuation.
nscoord
nsImageFrame::GetContinuationOffset(nscoord* aWidth) const
{
nscoord offset = 0;
if (aWidth) {
*aWidth = 0;
}
if (mPrevInFlow) {
for (nsIFrame* prevInFlow = mPrevInFlow ; prevInFlow; prevInFlow = prevInFlow->GetPrevInFlow()) {
nsRect rect = prevInFlow->GetRect();
if (aWidth) {
*aWidth = rect.width;
}
offset += rect.height;
}
offset -= mBorderPadding.top;
offset = PR_MAX(0, offset);
}
return offset;
}
NS_IMETHODIMP
nsImageFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsImageFrame", aReflowState.reason);
DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aStatus);
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");
aStatus = NS_FRAME_COMPLETE;
// see if we have a frozen size (i.e. a fixed width and height)
if (HaveFixedSize(aReflowState)) {
mState |= IMAGE_SIZECONSTRAINED;
} else {
mState &= ~IMAGE_SIZECONSTRAINED;
}
if (aReflowState.reason == eReflowReason_Initial) {
mState |= IMAGE_GOTINITIALREFLOW;
}
// Set our borderpadding so that if GetDesiredSize has to recalc the
// transform it can.
mBorderPadding = aReflowState.mComputedBorderPadding;
// get the desired size of the complete image
GetDesiredSize(aPresContext, aReflowState, aMetrics);
// add borders and padding
aMetrics.width += mBorderPadding.left + mBorderPadding.right;
aMetrics.height += mBorderPadding.top + mBorderPadding.bottom;
if (mPrevInFlow) {
nscoord y = GetContinuationOffset(&aMetrics.width);
aMetrics.height -= y + mBorderPadding.top;
aMetrics.height = PR_MAX(0, aMetrics.height);
}
// we have to split images if we are:
// in Paginated mode, we need to have a constrained height, and have a height larger than our available height
PRUint32 loadStatus = imgIRequest::STATUS_NONE;
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mContent);
NS_ASSERTION(imageLoader, "No content node??");
if (imageLoader) {
nsCOMPtr<imgIRequest> currentRequest;
imageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(currentRequest));
if (currentRequest) {
currentRequest->GetImageStatus(&loadStatus);
}
}
if (aPresContext->IsPaginated() &&
((loadStatus & imgIRequest::STATUS_SIZE_AVAILABLE) || (mState & IMAGE_SIZECONSTRAINED)) &&
NS_UNCONSTRAINEDSIZE != aReflowState.availableHeight &&
aMetrics.height > aReflowState.availableHeight) {
// split an image frame but not an image control frame
if (nsLayoutAtoms::imageFrame == GetType()) {
// our desired height was greater than 0, so to avoid infinite splitting, use 1 pixel as the min
aMetrics.height = PR_MAX(NSToCoordRound(aPresContext->ScaledPixelsToTwips()), aReflowState.availableHeight);
aStatus = NS_FRAME_NOT_COMPLETE;
}
}
aMetrics.ascent = aMetrics.height;
aMetrics.descent = 0;
if (aMetrics.mComputeMEW) {
aMetrics.SetMEWToActualWidth(aReflowState.mStylePosition->mWidth.GetUnit());
}
if (aMetrics.mFlags & NS_REFLOW_CALC_MAX_WIDTH) {
aMetrics.mMaximumWidth = aMetrics.width;
}
aMetrics.mOverflowArea.SetRect(0, 0, aMetrics.width, aMetrics.height);
FinishAndStoreOverflow(&aMetrics);
// Now that that's all done, check whether we're resizing... if we are,
// invalidate our rect.
// XXXbz we really only want to do this when reflow is completely done, but
// we have no way to detect when mRect changes (since SetRect is non-virtual,
// so this is the best we can do).
if (mRect.width != aMetrics.width || mRect.height != aMetrics.height) {
Invalidate(nsRect(0, 0, mRect.width, mRect.height), PR_FALSE);
}
NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
("exit nsImageFrame::Reflow: size=%d,%d",
aMetrics.width, aMetrics.height));
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aMetrics);
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(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsString& aAltText,
const nsRect& aRect)
{
// Set font and color
aRenderingContext.SetColor(GetStyleColor()->mColor);
SetFontFromStyle(&aRenderingContext, mStyleContext);
// Format the text to display within the formatting rect
nsIFontMetrics* fm;
aRenderingContext.GetFontMetrics(fm);
nscoord maxAscent, maxDescent, height;
fm->GetMaxAscent(maxAscent);
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;
// Always show the first line, even if we have to clip it below
PRBool firstLine = PR_TRUE;
while ((strLen > 0) && (firstLine || (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 + maxAscent);
// Move to the next line
str += maxFit;
strLen -= maxFit;
y += height;
firstLine = PR_FALSE;
}
NS_RELEASE(fm);
}
struct nsRecessedBorder : public nsStyleBorder {
nsRecessedBorder(nscoord aBorderWidth)
: nsStyleBorder()
{
NS_FOR_CSS_SIDES(side) {
// Note: use SetBorderColor here because we want to make sure
// the "special" flags are unset.
SetBorderColor(side, NS_RGB(0, 0, 0));
mBorder.side(side) = aBorderWidth;
// Note: use SetBorderStyle here because we want to affect
// mComputedBorder
SetBorderStyle(side, NS_STYLE_BORDER_STYLE_INSET);
}
}
};
void
nsImageFrame::DisplayAltFeedback(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
imgIRequest* aRequest)
{
// Calculate the inner area
nsRect inner = GetInnerArea();
// Display a recessed one pixel border
nscoord borderEdgeWidth;
float p2t = aPresContext->ScaledPixelsToTwips();
borderEdgeWidth = NSIntPixelsToTwips(ALT_BORDER_WIDTH, p2t);
// if inner area is empty, then make it big enough for at least the icon
if (inner.IsEmpty()){
inner.SizeTo(2*(NSIntPixelsToTwips(ICON_SIZE+ICON_PADDING+ALT_BORDER_WIDTH,p2t)),
2*(NSIntPixelsToTwips(ICON_SIZE+ICON_PADDING+ALT_BORDER_WIDTH,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(ICON_PADDING+ALT_BORDER_WIDTH, p2t),
NSIntPixelsToTwips(ICON_PADDING+ALT_BORDER_WIDTH, p2t));
if (inner.IsEmpty()) {
return;
}
// Clip so we don't render outside the inner rect
aRenderingContext.PushState();
aRenderingContext.SetClipRect(inner, nsClipCombine_kIntersect);
PRBool dispIcon = gIconLoad ? gIconLoad->mPrefShowPlaceholders : PR_TRUE;
// Check if we should display image placeholders
if (dispIcon) {
PRInt32 size = NSIntPixelsToTwips(ICON_SIZE, p2t);
PRBool iconUsed = PR_FALSE;
// see if the icon images are present...
if (gIconLoad && gIconLoad->mIconsLoaded) {
// pick the correct image
nsCOMPtr<imgIContainer> imgCon;
if (aRequest) {
aRequest->GetImage(getter_AddRefs(imgCon));
}
if (imgCon) {
// draw it
nsRect source(0,0,size,size);
nsRect dest(inner.x,inner.y,size,size);
aRenderingContext.DrawImage(imgCon, source, dest);
iconUsed = PR_TRUE;
}
}
// if we could not draw the image, then just draw some grafitti
if (!iconUsed) {
nscolor oldColor;
aRenderingContext.DrawRect(0,0,size,size);
aRenderingContext.GetColor(oldColor);
aRenderingContext.SetColor(NS_RGB(0xFF,0,0));
aRenderingContext.FillEllipse(NS_STATIC_CAST(int,size/2),NS_STATIC_CAST(int,size/2),
NS_STATIC_CAST(int,(size/2)-(2*p2t)),NS_STATIC_CAST(int,(size/2)-(2*p2t)));
aRenderingContext.SetColor(oldColor);
}
// Reduce the inner rect by the width of the icon, and leave an
// additional ICON_PADDING pixels for padding
PRInt32 iconWidth = NSIntPixelsToTwips(ICON_SIZE + ICON_PADDING, p2t);
inner.x += iconWidth;
inner.width -= iconWidth;
}
// If there's still room, display the alt-text
if (!inner.IsEmpty()) {
nsIContent* content = GetContent();
if (content) {
nsXPIDLString altText;
nsCSSFrameConstructor::GetAlternateTextFor(content, content->Tag(),
altText);
DisplayAltText(aPresContext, aRenderingContext, altText, inner);
}
}
aRenderingContext.PopState();
}
NS_METHOD
nsImageFrame::Paint(nsPresContext* 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;
aPresContext->PresShell()->IsPaintingSuppressed(&paintingSuppressed);
if (paintingSuppressed) {
return NS_OK;
}
// First paint background and borders, which should be in the
// FOREGROUND or BACKGROUND paint layer if the element is
// inline-level or block-level, respectively (bug 36710). (See
// CSS2 9.5, which is the rationale for paint layers.)
const nsStyleDisplay* display = GetStyleDisplay();
nsFramePaintLayer backgroundLayer = display->IsBlockLevel()
? NS_FRAME_PAINT_LAYER_BACKGROUND
: NS_FRAME_PAINT_LAYER_FOREGROUND;
if (aWhichLayer == backgroundLayer) {
PaintSelf(aPresContext, aRenderingContext, aDirtyRect);
}
if (mComputedSize.width != 0 && mComputedSize.height != 0) {
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mContent);
NS_ASSERTION(mContent, "Not an image loading content?");
nsCOMPtr<imgIRequest> currentRequest;
if (imageLoader) {
imageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(currentRequest));
}
nsCOMPtr<imgIContainer> imgCon;
PRUint32 loadStatus = imgIRequest::STATUS_ERROR;
if (currentRequest) {
currentRequest->GetImage(getter_AddRefs(imgCon));
currentRequest->GetImageStatus(&loadStatus);
}
if (loadStatus & imgIRequest::STATUS_ERROR || !imgCon) {
// No image yet, or image load failed. Draw the alt-text and an icon
// indicating the status (unless image is blocked, in which case we show nothing)
PRInt16 imageStatus = nsIContentPolicy::ACCEPT;
if (imageLoader) {
imageLoader->GetImageBlockingStatus(&imageStatus);
}
if (NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer &&
(NS_CP_ACCEPTED(imageStatus) ||
imageStatus != nsIContentPolicy::REJECT_SERVER)) {
DisplayAltFeedback(aPresContext, aRenderingContext,
(loadStatus & imgIRequest::STATUS_ERROR)
? gIconLoad->mBrokenImage
: gIconLoad->mLoadingImage);
}
}
else {
if (NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer && imgCon) {
// Render the image into our content area (the area inside
// the borders and padding)
nsRect inner = GetInnerArea();
nsRect paintArea(inner);
nscoord offsetY = 0;
// if the image is split account for y-offset
if (mPrevInFlow) {
offsetY = GetContinuationOffset();
}
if (mIntrinsicSize == mComputedSize) {
// Find the actual rect to be painted to in the rendering context
paintArea.IntersectRect(paintArea, aDirtyRect);
// Rect in the image to paint
nsRect r(paintArea.x - inner.x,
paintArea.y - inner.y + offsetY,
paintArea.width,
paintArea.height);
aRenderingContext.DrawImage(imgCon, r, paintArea);
} else {
// The computed size is the total size of all the continuations,
// including ourselves. Note that we're basically inverting
// mTransform here (would it too much to ask for
// nsTransform2D::Invert?), since we need to convert from
// rendering context coords to image coords...
nsTransform2D trans;
trans.SetToScale((float(mIntrinsicSize.width) / float(mComputedSize.width)),
(float(mIntrinsicSize.height) / float(mComputedSize.height)));
// XXXbz it looks like we should take
// IntersectRect(paintArea, aDirtyRect) here too, but things
// get very weird if I do that ....
// paintArea.IntersectRect(paintArea, aDirtyRect);
// dirty rect in image our coord size...
nsRect r(paintArea.x - inner.x,
paintArea.y - inner.y + offsetY,
paintArea.width,
paintArea.height);
// Transform that to image coords
trans.TransformCoord(&r.x, &r.y, &r.width, &r.height);
#ifdef DEBUG_decode
printf("IF draw src (%d,%d,%d,%d) -> dst (%d,%d,%d,%d)\n",
r.x, r.y, r.width, r.height, paintArea.x, paintArea.y,
paintArea.width, paintArea.height);
#endif
aRenderingContext.DrawImage(imgCon, r, paintArea);
}
}
nsImageMap* map = GetImageMap(aPresContext);
if (nsnull != map) {
nsRect inner = GetInnerArea();
aRenderingContext.PushState();
aRenderingContext.SetColor(NS_RGB(0, 0, 0));
aRenderingContext.SetLineStyle(nsLineStyle_kDotted);
aRenderingContext.Translate(inner.x, inner.y);
map->Draw(aPresContext, aRenderingContext);
aRenderingContext.PopState();
}
#ifdef DEBUG
if ((NS_FRAME_PAINT_LAYER_DEBUG == aWhichLayer) &&
GetShowFrameBorders()) {
nsImageMap* map = GetImageMap(aPresContext);
if (nsnull != map) {
nsRect inner = GetInnerArea();
aRenderingContext.SetColor(NS_RGB(0, 0, 0));
aRenderingContext.PushState();
aRenderingContext.Translate(inner.x, inner.y);
map->Draw(aPresContext, aRenderingContext);
aRenderingContext.PopState();
}
}
#endif
}
}
}
PRInt16 displaySelection = 0;
nsresult result;
result = aPresContext->PresShell()->GetSelectionFlags(&displaySelection);
if (NS_FAILED(result))
return result;
if (!(displaySelection & nsISelectionDisplay::DISPLAY_IMAGES))
return NS_OK;//no need to check the blue border, we cannot be drawn selected
//insert hook here for image selection drawing
#if IMAGE_EDITOR_CHECK
//check to see if this frame is in an editor context
//isEditor check. this needs to be changed to have better way to check
if (displaySelection == nsISelectionDisplay::DISPLAY_ALL)
{
nsCOMPtr<nsISelectionController> selCon;
result = GetSelectionController(aPresContext, getter_AddRefs(selCon));
if (NS_SUCCEEDED(result) && selCon)
{
nsCOMPtr<nsISelection> selection;
result = selCon->GetSelection(nsISelectionController::SELECTION_NORMAL, getter_AddRefs(selection));
if (NS_SUCCEEDED(result) && selection)
{
PRInt32 rangeCount;
selection->GetRangeCount(&rangeCount);
if (rangeCount == 1) //if not one then let code drop to nsFrame::Paint
{
nsCOMPtr<nsIContent> parentContent = mContent->GetParent();
if (parentContent)
{
PRInt32 thisOffset = parentContent->IndexOf(mContent);
nsCOMPtr<nsIDOMNode> parentNode = do_QueryInterface(parentContent);
nsCOMPtr<nsIDOMNode> rangeNode;
PRInt32 rangeOffset;
nsCOMPtr<nsIDOMRange> range;
selection->GetRangeAt(0,getter_AddRefs(range));
if (range)
{
range->GetStartContainer(getter_AddRefs(rangeNode));
range->GetStartOffset(&rangeOffset);
if (parentNode && rangeNode && (rangeNode == parentNode) && rangeOffset == thisOffset)
{
range->GetEndContainer(getter_AddRefs(rangeNode));
range->GetEndOffset(&rangeOffset);
if ((rangeNode == parentNode) && (rangeOffset == (thisOffset +1))) //+1 since that would mean this whole content is selected only
return NS_OK; //do not allow nsFrame do draw any further selection
}
}
}
}
}
}
}
#endif
return nsFrame::Paint(aPresContext, aRenderingContext, aDirtyRect, aWhichLayer, nsISelectionDisplay::DISPLAY_IMAGES);
}
NS_IMETHODIMP
nsImageFrame::GetImageMap(nsPresContext *aPresContext, nsIImageMap **aImageMap)
{
nsImageMap *map = GetImageMap(aPresContext);
return CallQueryInterface(map, aImageMap);
}
nsImageMap*
nsImageFrame::GetImageMap(nsPresContext* aPresContext)
{
if (!mImageMap) {
nsIDocument* doc = mContent->GetDocument();
if (!doc) {
return nsnull;
}
nsAutoString usemap;
mContent->GetAttr(kNameSpaceID_None, nsHTMLAtoms::usemap, usemap);
nsCOMPtr<nsIDOMHTMLMapElement> map = nsImageMapUtils::FindImageMap(doc,usemap);
if (map) {
mImageMap = new nsImageMap();
if (mImageMap) {
NS_ADDREF(mImageMap);
mImageMap->Init(aPresContext->PresShell(), this, map);
}
}
}
return mImageMap;
}
void
nsImageFrame::TriggerLink(nsPresContext* aPresContext,
nsIURI* aURI,
const nsString& aTargetSpec,
PRBool aClick)
{
// We get here with server side image map
nsILinkHandler *handler = aPresContext->GetLinkHandler();
if (handler) {
if (aClick) {
// 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);
if (NS_FAILED(rv))
return;
nsIPresShell *ps = aPresContext->GetPresShell();
if (!ps)
return;
nsIDocument *doc = ps->GetDocument();
if (doc) {
rv = securityManager->
CheckLoadURIWithPrincipal(doc->GetPrincipal(), aURI,
nsIScriptSecurityManager::STANDARD);
// Only pass off the click event if the script security manager
// says it's ok.
if (NS_SUCCEEDED(rv))
handler->OnLinkClick(mContent, eLinkVerb_Replace, aURI,
aTargetSpec.get());
}
}
else {
handler->OnOverLink(mContent, aURI, aTargetSpec.get());
}
}
}
PRBool
nsImageFrame::IsServerImageMap()
{
nsAutoString ismap;
return NS_CONTENT_ATTR_HAS_VALUE ==
mContent->GetAttr(kNameSpaceID_None, nsHTMLAtoms::ismap, ismap);
}
//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(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.
if (!HasView()) {
nsPoint offset;
nsIView *view;
GetOffsetFromView(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();
x -= inner.x;
y -= inner.y;
// Translate the coordinates from twips to pixels
float t2p;
t2p = GetPresContext()->TwipsToPixels();
aResult.x = NSTwipsToIntPixels(x, t2p);
aResult.y = NSTwipsToIntPixels(y, t2p);
}
PRBool
nsImageFrame::GetAnchorHREFAndTarget(nsIURI** aHref, nsString& aTarget)
{
PRBool status = PR_FALSE;
aTarget.Truncate();
// Walk up the content tree, looking for an nsIDOMAnchorElement
for (nsIContent* content = mContent->GetParent();
content; content = content->GetParent()) {
nsCOMPtr<nsILink> link(do_QueryInterface(content));
if (link) {
link->GetHrefURI(aHref);
status = (*aHref != nsnull);
nsCOMPtr<nsIDOMHTMLAnchorElement> anchor(do_QueryInterface(content));
if (anchor) {
anchor->GetTarget(aTarget);
}
break;
}
}
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(nsPresContext* aPresContext,
nsEvent* aEvent,
nsIContent** aContent)
{
NS_ENSURE_ARG_POINTER(aContent);
nsImageMap* map;
map = GetImageMap(aPresContext);
if (nsnull != map) {
nsPoint p;
TranslateEventCoords(aEvent->point, p);
PRBool inside = PR_FALSE;
nsCOMPtr<nsIContent> area;
inside = map->IsInside(p.x, p.y, getter_AddRefs(area));
if (inside && area) {
*aContent = area;
NS_ADDREF(*aContent);
return NS_OK;
}
}
*aContent = GetContent();
NS_IF_ADDREF(*aContent);
return NS_OK;
}
// XXX what should clicks on transparent pixels do?
NS_IMETHODIMP
nsImageFrame::HandleEvent(nsPresContext* 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(aEvent->point, p);
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));
}
if (!inside && isServerMap) {
// Server side image maps use the href in a containing anchor
// element to provide the basis for the destination url.
nsCOMPtr<nsIURI> uri;
nsAutoString target;
if (GetAnchorHREFAndTarget(getter_AddRefs(uri), target)) {
// 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;
nsCAutoString spec;
uri->GetSpec(spec);
spec += nsPrintfCString("?%d,%d", p.x, p.y);
uri->SetSpec(spec);
PRBool clicked = PR_FALSE;
if (aEvent->message == NS_MOUSE_LEFT_BUTTON_UP) {
*aEventStatus = nsEventStatus_eConsumeDoDefault;
clicked = PR_TRUE;
}
TriggerLink(aPresContext, uri, target, clicked);
}
}
}
break;
}
default:
break;
}
return nsSplittableFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
}
NS_IMETHODIMP
nsImageFrame::GetCursor(const nsPoint& aPoint,
nsIFrame::Cursor& aCursor)
{
nsPresContext* context = GetPresContext();
nsImageMap* map = GetImageMap(context);
if (nsnull != map) {
nsPoint p;
TranslateEventCoords(aPoint, p);
nsCOMPtr<nsIContent> area;
if (map->IsInside(p.x, p.y, getter_AddRefs(area))) {
// Use the cursor from the style of the *area* element.
// XXX Using the image as the parent style context isn't
// technically correct, but it's probably the right thing to do
// here, since it means that areas on which the cursor isn't
// specified will inherit the style from the image.
nsRefPtr<nsStyleContext> areaStyle =
GetPresContext()->PresShell()->StyleSet()->
ResolveStyleFor(area, GetStyleContext());
if (areaStyle) {
FillCursorInformationFromStyle(areaStyle->GetStyleUserInterface(),
aCursor);
if (NS_STYLE_CURSOR_AUTO == aCursor.mCursor) {
aCursor.mCursor = NS_STYLE_CURSOR_DEFAULT;
}
return NS_OK;
}
}
}
return nsFrame::GetCursor(aPoint, aCursor);
}
NS_IMETHODIMP
nsImageFrame::AttributeChanged(nsIContent* aChild,
PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aModType)
{
nsresult rv = nsSplittableFrame::AttributeChanged(aChild, aNameSpaceID,
aAttribute, aModType);
if (NS_FAILED(rv)) {
return rv;
}
if (nsHTMLAtoms::alt == aAttribute)
{
mState |= NS_FRAME_IS_DIRTY;
mParent->ReflowDirtyChild(GetPresContext()->PresShell(), (nsIFrame*) this);
}
return NS_OK;
}
nsIAtom*
nsImageFrame::GetType() const
{
return nsLayoutAtoms::imageFrame;
}
#ifdef DEBUG
NS_IMETHODIMP
nsImageFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("ImageFrame"), aResult);
}
NS_IMETHODIMP
nsImageFrame::List(nsPresContext* aPresContext, FILE* out, PRInt32 aIndent) const
{
IndentBy(out, aIndent);
ListTag(out);
#ifdef DEBUG_waterson
fprintf(out, " [parent=%p]", mParent);
#endif
if (HasView()) {
fprintf(out, " [view=%p]", GetView());
}
fprintf(out, " {%d,%d,%d,%d}", mRect.x, mRect.y, mRect.width,
mRect.height);
if (0 != mState) {
fprintf(out, " [state=%08x]", mState);
}
fprintf(out, " [content=%p]", mContent);
// output the img src url
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mContent);
if (imageLoader) {
nsCOMPtr<imgIRequest> currentRequest;
imageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(currentRequest));
if (currentRequest) {
nsCOMPtr<nsIURI> uri;
currentRequest->GetURI(getter_AddRefs(uri));
nsCAutoString uristr;
uri->GetAsciiSpec(uristr);
fprintf(out, " [src=%s]", uristr.get());
}
}
fputs("\n", out);
return NS_OK;
}
#endif
NS_IMETHODIMP
nsImageFrame::GetIntrinsicImageSize(nsSize& aSize)
{
aSize = mIntrinsicSize;
return NS_OK;
}
nsresult
nsImageFrame::LoadIcon(const nsAString& aSpec,
nsPresContext *aPresContext,
imgIRequest** aRequest)
{
nsresult rv = NS_OK;
NS_PRECONDITION(!aSpec.IsEmpty(), "What happened??");
if (!sIOService) {
static NS_DEFINE_CID(kIOServiceCID, NS_IOSERVICE_CID);
rv = CallGetService(kIOServiceCID, &sIOService);
NS_ENSURE_SUCCESS(rv, rv);
}
nsCOMPtr<nsIURI> realURI;
SpecToURI(aSpec, sIOService, getter_AddRefs(realURI));
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));
// For icon loads, we don't need to merge with the loadgroup flags
nsLoadFlags loadFlags = nsIRequest::LOAD_NORMAL;
return il->LoadImage(realURI, /* icon URI */
nsnull, /* initial document URI; this is only
relevant for cookies, so does not
apply to icons. */
nsnull, /* referrer (not relevant for icons) */
loadGroup,
mListener,
nsnull, /* Not associated with any particular document */
loadFlags,
nsnull,
nsnull,
aRequest);
}
void
nsImageFrame::GetDocumentCharacterSet(nsACString& aCharset) const
{
if (mContent) {
NS_ASSERTION(mContent->GetDocument(),
"Frame still alive after content removed from document!");
aCharset = mContent->GetDocument()->GetDocumentCharacterSet();
}
}
void
nsImageFrame::SpecToURI(const nsAString& aSpec, nsIIOService *aIOService,
nsIURI **aURI)
{
nsCOMPtr<nsIURI> baseURI;
if (mContent) {
baseURI = mContent->GetBaseURI();
}
nsCAutoString charset;
GetDocumentCharacterSet(charset);
NS_NewURI(aURI, aSpec,
charset.IsEmpty() ? nsnull : charset.get(),
baseURI, aIOService);
}
void
nsImageFrame::GetLoadGroup(nsPresContext *aPresContext, nsILoadGroup **aLoadGroup)
{
if (!aPresContext)
return;
NS_PRECONDITION(nsnull != aLoadGroup, "null OUT parameter pointer");
nsIPresShell *shell = aPresContext->GetPresShell();
if (!shell)
return;
nsIDocument *doc = shell->GetDocument();
if (!doc)
return;
*aLoadGroup = doc->GetDocumentLoadGroup().get(); // already_AddRefed
}
nsresult nsImageFrame::LoadIcons(nsPresContext *aPresContext)
{
NS_ASSERTION(!gIconLoad, "called LoadIcons twice");
NS_NAMED_LITERAL_STRING(loadingSrc,"resource://gre/res/loading-image.gif");
NS_NAMED_LITERAL_STRING(brokenSrc,"resource://gre/res/broken-image.gif");
gIconLoad = new IconLoad(mListener);
if (!gIconLoad)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(gIconLoad);
nsresult rv;
// create a loader and load the images
rv = LoadIcon(loadingSrc,
aPresContext,
getter_AddRefs(gIconLoad->mLoadingImage));
#ifdef NOISY_ICON_LOADING
printf("Loading request %p, rv=%u\n",
gIconLoad->mLoadingImage.get(), rv);
#endif
if (NS_FAILED(rv)) {
return rv;
}
rv = LoadIcon(brokenSrc,
aPresContext,
getter_AddRefs(gIconLoad->mBrokenImage));
#ifdef NOISY_ICON_LOADING
printf("Loading request %p, rv=%u\n",
gIconLoad->mBrokenImage.get(), rv);
#endif
// ImageLoader will callback into OnStartContainer, which will
// handle the mIconsLoaded flag
return rv;
}
PRBool nsImageFrame::HandleIconLoads(imgIRequest* aRequest, PRBool aLoaded)
{
PRBool result = PR_FALSE;
if (gIconLoad) {
// check which image it is
if (aRequest == gIconLoad->mLoadingImage ||
aRequest == gIconLoad->mBrokenImage) {
result = PR_TRUE;
if (aLoaded && (++gIconLoad->mIconsLoaded == 2))
gIconLoad->mLoadObserver = nsnull;
}
#ifdef NOISY_ICON_LOADING
if (gIconLoad->mIconsLoaded && result) {
printf( "Icons Loaded: request for %s\n",
aRequest == gIconLoad->mLoadingImage
? "mLoadingImage" : "mBrokenImage" );
}
#endif
}
#ifdef NOISY_ICON_LOADING
printf( "HandleIconLoads returned %s (%p)\n", result ? "TRUE" : "FALSE", this);
#endif
return result;
}
void nsImageFrame::InvalidateIcon()
{
// invalidate the inner area, where the icon lives
nsPresContext *presContext = GetPresContext();
float p2t = presContext->ScaledPixelsToTwips();
nsRect inner = GetInnerArea();
nsRect rect(inner.x,
inner.y,
NSIntPixelsToTwips(ICON_SIZE+ICON_PADDING, p2t),
NSIntPixelsToTwips(ICON_SIZE+ICON_PADDING, p2t));
NS_ASSERTION(!rect.IsEmpty(), "icon rect cannot be empty!");
// update image area
Invalidate(rect, PR_FALSE);
}
NS_IMPL_ISUPPORTS1(nsImageFrame::IconLoad, nsIObserver)
static const char kIconLoadPrefs[][40] = {
"browser.display.force_inline_alttext",
"browser.display.show_image_placeholders"
};
nsImageFrame::IconLoad::IconLoad(imgIDecoderObserver *aObserver)
: mLoadObserver(aObserver),
mIconsLoaded(0)
{
nsCOMPtr<nsIPrefBranch2> prefBranch =
do_QueryInterface(nsContentUtils::GetPrefBranch());
// register observers
for (PRUint32 i = 0; i < NS_ARRAY_LENGTH(kIconLoadPrefs); ++i)
prefBranch->AddObserver(kIconLoadPrefs[i], this, PR_FALSE);
GetPrefs();
}
NS_IMETHODIMP
nsImageFrame::IconLoad::Observe(nsISupports *aSubject, const char* aTopic,
const PRUnichar* aData)
{
NS_ASSERTION(!nsCRT::strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID),
"wrong topic");
#ifdef DEBUG
// assert |aData| is one of our prefs.
for (PRUint32 i = 0; i < NS_ARRAY_LENGTH(kIconLoadPrefs) ||
(NS_NOTREACHED("wrong pref"), PR_FALSE); ++i)
if (NS_ConvertASCIItoUTF16(kIconLoadPrefs[i]) == nsDependentString(aData))
break;
#endif
GetPrefs();
return NS_OK;
}
void nsImageFrame::IconLoad::GetPrefs()
{
mPrefForceInlineAltText =
nsContentUtils::GetBoolPref("browser.display.force_inline_alttext");
mPrefShowPlaceholders =
nsContentUtils::GetBoolPref("browser.display.show_image_placeholders",
PR_TRUE);
}
NS_IMPL_ISUPPORTS2(nsImageListener, imgIDecoderObserver, imgIContainerObserver)
nsImageListener::nsImageListener(nsImageFrame *aFrame) :
mFrame(aFrame)
{
}
nsImageListener::~nsImageListener()
{
}
NS_IMETHODIMP nsImageListener::OnStartDecode(imgIRequest *aRequest)
{
// Not useful to us yet.
return NS_OK;
}
NS_IMETHODIMP nsImageListener::OnStartContainer(imgIRequest *aRequest,
imgIContainer *aImage)
{
if (!mFrame)
return NS_ERROR_FAILURE;
return mFrame->OnStartContainer(aRequest, aImage);
}
NS_IMETHODIMP nsImageListener::OnStartFrame(imgIRequest *aRequest,
gfxIImageFrame *aFrame)
{
// Not useful to us yet.
return NS_OK;
}
NS_IMETHODIMP nsImageListener::OnDataAvailable(imgIRequest *aRequest,
gfxIImageFrame *aFrame,
const nsRect *aRect)
{
if (!mFrame)
return NS_ERROR_FAILURE;
return mFrame->OnDataAvailable(aRequest, aFrame, aRect);
}
NS_IMETHODIMP nsImageListener::OnStopFrame(imgIRequest *aRequest,
gfxIImageFrame *aFrame)
{
// Not useful to us yet.
return NS_OK;
}
NS_IMETHODIMP nsImageListener::OnStopContainer(imgIRequest *aRequest,
imgIContainer *aImage)
{
// Not useful to us yet.
return NS_OK;
}
NS_IMETHODIMP nsImageListener::OnStopDecode(imgIRequest *aRequest,
nsresult status,
const PRUnichar *statusArg)
{
if (!mFrame)
return NS_ERROR_FAILURE;
return mFrame->OnStopDecode(aRequest, status, statusArg);
}
NS_IMETHODIMP nsImageListener::FrameChanged(imgIContainer *aContainer,
gfxIImageFrame *newframe,
nsRect * dirtyRect)
{
if (!mFrame)
return NS_ERROR_FAILURE;
return mFrame->FrameChanged(aContainer, newframe, dirtyRect);
}
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