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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 -*- */
/* ***** 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):
* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation
*
* 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 ***** */
/* rendering object for replaced elements with bitmap image data */
#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 "nsGkAtoms.h"
#include "nsIDocument.h"
#include "nsINodeInfo.h"
#include "nsContentUtils.h"
#include "nsCSSAnonBoxes.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 "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 "nsImageMapUtils.h"
#include "nsIScriptSecurityManager.h"
#ifdef ACCESSIBILITY
#include "nsIAccessibilityService.h"
#endif
#include "nsIServiceManager.h"
#include "nsIDOMNode.h"
#include "nsGUIEvent.h"
#include "nsLayoutUtils.h"
#include "nsDisplayList.h"
#include "imgIContainer.h"
#include "imgILoader.h"
#include "nsContentPolicyUtils.h"
#include "nsCSSFrameConstructor.h"
#include "nsIPrefBranch2.h"
#include "nsIPrefService.h"
#include "nsIDOMRange.h"
#include "nsIContentPolicy.h"
#include "nsContentPolicyUtils.h"
#include "nsIEventStateManager.h"
#include "nsLayoutErrors.h"
#include "nsBidiUtils.h"
#include "nsBidiPresUtils.h"
// 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 ComputedHeight()
// or ComputedWidth() 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, ComputedWidth() is NS_UNCONSTRAINEDSIZE
// in pass 2 reflow, ComputedWidth() 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.ComputedHeight()) ||
(eStyleUnit_Percent == widthUnit && (NS_UNCONSTRAINEDSIZE == aReflowState.ComputedWidth() ||
0 == aReflowState.ComputedWidth())))
? PR_FALSE
: HaveFixedSize(aReflowState.mStylePosition);
}
nsIFrame*
NS_NewImageFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsImageFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsImageFrame)
nsImageFrame::nsImageFrame(nsStyleContext* aContext) :
ImageFrameSuper(aContext),
mComputedSize(0, 0),
mIntrinsicSize(0, 0),
mDisplayingIcon(PR_FALSE)
{
// 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_QUERYFRAME_HEAD(nsImageFrame)
NS_QUERYFRAME_ENTRY(nsIImageFrame)
NS_QUERYFRAME_TAIL_INHERITING(ImageFrameSuper)
#ifdef ACCESSIBILITY
already_AddRefed<nsAccessible>
nsImageFrame::CreateAccessible()
{
nsCOMPtr<nsIAccessibilityService> accService = do_GetService("@mozilla.org/accessibilityService;1");
if (accService) {
return accService->CreateHTMLImageAccessible(mContent,
PresContext()->PresShell());
}
return nsnull;
}
#endif
void
nsImageFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
// 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);
}
reinterpret_cast<nsImageListener*>(mListener.get())->SetFrame(nsnull);
}
mListener = nsnull;
// If we were displaying an icon, take ourselves off the list
if (mDisplayingIcon)
gIconLoad->RemoveIconObserver(this);
nsSplittableFrame::DestroyFrom(aDestructRoot);
}
NS_IMETHODIMP
nsImageFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsresult rv = nsSplittableFrame::Init(aContent, aParent, 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);
nsPresContext *aPresContext = PresContext();
if (!gIconLoad)
LoadIcons(aPresContext);
// Give image loads associated with an image frame a small priority boost!
nsCOMPtr<imgIRequest> currentRequest;
imageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(currentRequest));
nsCOMPtr<nsISupportsPriority> p = do_QueryInterface(currentRequest);
if (p)
p->AdjustPriority(-1);
// 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::UpdateIntrinsicSize(imgIContainer* aImage)
{
NS_PRECONDITION(aImage, "null image");
PRBool intrinsicSizeChanged = PR_FALSE;
if (aImage) {
nsIntSize imageSizeInPx;
if (NS_FAILED(aImage->GetWidth(&imageSizeInPx.width)) ||
NS_FAILED(aImage->GetHeight(&imageSizeInPx.height))) {
imageSizeInPx.SizeTo(0, 0);
}
nsSize newSize(nsPresContext::CSSPixelsToAppUnits(imageSizeInPx.width),
nsPresContext::CSSPixelsToAppUnits(imageSizeInPx.height));
if (mIntrinsicSize != newSize) {
intrinsicSizeChanged = PR_TRUE;
mIntrinsicSize = newSize;
}
}
return intrinsicSizeChanged;
}
void
nsImageFrame::RecalculateTransform(PRBool aInnerAreaChanged)
{
// 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?
if (aInnerAreaChanged) {
nsRect innerArea = GetInnerArea();
mTransform.SetToTranslate(float(innerArea.x),
float(innerArea.y - GetContinuationOffset()));
}
// Set the scale factors
if (mIntrinsicSize.width != 0 && mIntrinsicSize.height != 0 &&
mIntrinsicSize != mComputedSize) {
mTransform.SetScale(float(mComputedSize.width) / float(mIntrinsicSize.width),
float(mComputedSize.height) / float(mIntrinsicSize.height));
} else {
mTransform.SetScale(1.0f, 1.0f);
}
}
/*
* 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 nsIntRect& aRect)
{
// 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(nsPresContext::CSSPixelsToAppUnits(aRect.x - 1),
nsPresContext::CSSPixelsToAppUnits(aRect.y - 1),
nsPresContext::CSSPixelsToAppUnits(aRect.width + 2),
nsPresContext::CSSPixelsToAppUnits(aRect.height + 2));
mTransform.TransformCoord(&r.x, &r.y, &r.width, &r.height);
// Now, round the edges out to the pixel boundary.
int scale = nsPresContext::CSSPixelsToAppUnits(1);
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;
}
// Note that we treat NS_EVENT_STATE_SUPPRESSED images as "OK". This means
// that we'll construct image frames for them as needed if their display is
// toggled from "none" (though we won't paint them, unless their visibility
// is changed too).
#define BAD_STATES (NS_EVENT_STATE_BROKEN | NS_EVENT_STATE_USERDISABLED | \
NS_EVENT_STATE_LOADING)
// This is a macro so that we don't evaluate the boolean last arg
// unless we have to; it can be expensive
#define IMAGE_OK(_state, _loadingOK) \
(((_state) & BAD_STATES) == 0 || \
(((_state) & BAD_STATES) == NS_EVENT_STATE_LOADING && \
(_loadingOK)))
/* static */
PRBool
nsImageFrame::ShouldCreateImageFrameFor(nsIContent* aContent,
nsStyleContext* aStyleContext)
{
PRInt32 state = aContent->IntrinsicState();
if (IMAGE_OK(state,
HaveFixedSize(aStyleContext->GetStylePosition()))) {
// Image is fine; do the image frame thing
return PR_TRUE;
}
// Check if we want to use a placeholder box with an icon or just
// let 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 show an icon.
// - otherwise, skip the icon
PRBool useSizedBox;
if (aStyleContext->GetStyleUIReset()->mForceBrokenImageIcon) {
useSizedBox = PR_TRUE;
}
else if (gIconLoad && gIconLoad->mPrefForceInlineAltText) {
useSizedBox = PR_FALSE;
}
else {
if (aStyleContext->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.
nsIAtom *localName = aContent->NodeInfo()->NameAtom();
// Use a sized box if we have no alt text. This means no alt attribute
// and the node is not an object or an input (since those always have alt
// text).
if (!aContent->HasAttr(kNameSpaceID_None, nsGkAtoms::alt) &&
localName != nsGkAtoms::object &&
localName != nsGkAtoms::input) {
useSizedBox = PR_TRUE;
}
else {
// check whether we have fixed size
useSizedBox = HaveFixedSize(aStyleContext->GetStylePosition());
}
}
}
return useSizedBox;
}
nsresult
nsImageFrame::OnStartContainer(imgIRequest *aRequest, imgIContainer *aImage)
{
if (!aImage) return NS_ERROR_INVALID_ARG;
/* Get requested animation policy from the pres context:
* normal = 0
* one frame = 1
* one loop = 2
*/
nsPresContext *presContext = PresContext();
aImage->SetAnimationMode(presContext->ImageAnimationMode());
// Ensure the animation (if any) is started.
aImage->StartAnimation();
if (IsPendingLoad(aRequest)) {
// We don't care
return NS_OK;
}
UpdateIntrinsicSize(aImage);
if (mState & IMAGE_GOTINITIALREFLOW) {
// If we previously set the intrinsic size (in EnsureIntrinsicSize)
// to the size of the loading-image icon and reflowed the frame,
// we'll have an mTransform computed from that intrinsic size. But
// if we still have that transform when we get OnDataAvailable
// calls, we'll invalidate the wrong area. So update the transform
// now.
RecalculateTransform(PR_FALSE);
// Now we need to reflow if we have an unconstrained size and have
// already gotten the initial reflow
if (!(mState & IMAGE_SIZECONSTRAINED)) {
nsIPresShell *presShell = presContext->GetPresShell();
NS_ASSERTION(presShell, "No PresShell.");
if (presShell) {
presShell->FrameNeedsReflow(this, nsIPresShell::eStyleChange,
NS_FRAME_IS_DIRTY);
}
}
}
return NS_OK;
}
nsresult
nsImageFrame::OnDataAvailable(imgIRequest *aRequest,
PRBool aCurrentFrame,
const nsIntRect *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;
}
// XXX We really need to round this out, now that we're doing better
// image scaling!
nsRect r = SourceRectToDest(*aRect);
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
if (!aCurrentFrame)
return NS_OK;
#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);
return NS_OK;
}
nsresult
nsImageFrame::OnStopDecode(imgIRequest *aRequest,
nsresult aStatus,
const PRUnichar *aStatusArg)
{
nsPresContext *presContext = PresContext();
nsIPresShell *presShell = presContext->GetPresShell();
NS_ASSERTION(presShell, "No PresShell.");
// 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 = UpdateIntrinsicSize(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 haven't gotten the initial reflow yet
if (!(mState & IMAGE_SIZECONSTRAINED) && intrinsicSizeChanged) {
if (presShell) {
presShell->FrameNeedsReflow(this, nsIPresShell::eStyleChange,
NS_FRAME_IS_DIRTY);
}
} else {
nsSize s = GetSize();
nsRect r(0, 0, s.width, s.height);
// Update border+content to account for image change
Invalidate(r);
}
}
}
return NS_OK;
}
nsresult
nsImageFrame::FrameChanged(imgIContainer *aContainer, nsIntRect *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);
return NS_OK;
}
void
nsImageFrame::EnsureIntrinsicSize(nsPresContext* aPresContext)
{
// 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) {
// Jump through all the hoops to get the status of the request
nsCOMPtr<imgIRequest> currentRequest;
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mContent);
if (imageLoader)
imageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(currentRequest));
PRUint32 status = 0;
if (currentRequest)
currentRequest->GetImageStatus(&status);
// If we know the size, we can grab it and use it for an update
if (status & imgIRequest::STATUS_SIZE_AVAILABLE) {
nsCOMPtr<imgIContainer> imgCon;
currentRequest->GetImage(getter_AddRefs(imgCon));
NS_ABORT_IF_FALSE(imgCon, "SIZE_AVAILABLE, but no imgContainer?");
UpdateIntrinsicSize(imgCon);
} 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(nsPresContext::CSSPixelsToAppUnits(ICON_SIZE+(2*(ICON_PADDING+ALT_BORDER_WIDTH))),
nsPresContext::CSSPixelsToAppUnits(ICON_SIZE+(2*(ICON_PADDING+ALT_BORDER_WIDTH))));
}
}
}
}
/* virtual */ nsSize
nsImageFrame::ComputeSize(nsIRenderingContext *aRenderingContext,
nsSize aCBSize, nscoord aAvailableWidth,
nsSize aMargin, nsSize aBorder, nsSize aPadding,
PRBool aShrinkWrap)
{
nsPresContext *presContext = PresContext();
EnsureIntrinsicSize(presContext);
IntrinsicSize intrinsicSize;
intrinsicSize.width.SetCoordValue(mIntrinsicSize.width);
intrinsicSize.height.SetCoordValue(mIntrinsicSize.height);
nsSize& intrinsicRatio = mIntrinsicSize; // won't actually be used
return nsLayoutUtils::ComputeSizeWithIntrinsicDimensions(
aRenderingContext, this,
intrinsicSize, intrinsicRatio, aCBSize,
aMargin, aBorder, aPadding);
}
nsRect
nsImageFrame::GetInnerArea() const
{
return GetContentRect() - GetPosition();
}
// get the offset into the content area of the image where aImg starts if it is a continuation.
nscoord
nsImageFrame::GetContinuationOffset() const
{
nscoord offset = 0;
for (nsIFrame *f = GetPrevInFlow(); f; f = f->GetPrevInFlow()) {
offset += f->GetContentRect().height;
}
NS_ASSERTION(offset >= 0, "bogus GetContentRect");
return offset;
}
/* virtual */ nscoord
nsImageFrame::GetMinWidth(nsIRenderingContext *aRenderingContext)
{
// XXX The caller doesn't account for constraints of the height,
// min-height, and max-height properties.
nscoord result;
DISPLAY_MIN_WIDTH(this, result);
nsPresContext *presContext = PresContext();
EnsureIntrinsicSize(presContext);
result = mIntrinsicSize.width;
return result;
}
/* virtual */ nscoord
nsImageFrame::GetPrefWidth(nsIRenderingContext *aRenderingContext)
{
// XXX The caller doesn't account for constraints of the height,
// min-height, and max-height properties.
nscoord result;
DISPLAY_PREF_WIDTH(this, result);
nsPresContext *presContext = PresContext();
EnsureIntrinsicSize(presContext);
// convert from normal twips to scaled twips (printing...)
result = mIntrinsicSize.width;
return result;
}
/* virtual */ nsSize
nsImageFrame::GetIntrinsicRatio()
{
EnsureIntrinsicSize(PresContext());
return mIntrinsicSize;
}
NS_IMETHODIMP
nsImageFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsImageFrame");
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;
}
// XXXldb These two bits are almost exact opposites (except in the
// middle of the initial reflow); remove IMAGE_GOTINITIALREFLOW.
if (GetStateBits() & NS_FRAME_FIRST_REFLOW) {
mState |= IMAGE_GOTINITIALREFLOW;
}
mComputedSize =
nsSize(aReflowState.ComputedWidth(), aReflowState.ComputedHeight());
RecalculateTransform(PR_TRUE);
aMetrics.width = mComputedSize.width;
aMetrics.height = mComputedSize.height;
// add borders and padding
aMetrics.width += aReflowState.mComputedBorderPadding.LeftRight();
aMetrics.height += aReflowState.mComputedBorderPadding.TopBottom();
if (GetPrevInFlow()) {
aMetrics.width = GetPrevInFlow()->GetSize().width;
nscoord y = GetContinuationOffset();
aMetrics.height -= y + aReflowState.mComputedBorderPadding.top;
aMetrics.height = NS_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) {
// our desired height was greater than 0, so to avoid infinite
// splitting, use 1 pixel as the min
aMetrics.height = NS_MAX(nsPresContext::CSSPixelsToAppUnits(1), aReflowState.availableHeight);
aStatus = NS_FRAME_NOT_COMPLETE;
}
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));
}
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
nscoord
nsImageFrame::MeasureString(const PRUnichar* aString,
PRInt32 aLength,
nscoord aMaxWidth,
PRUint32& aMaxFit,
nsIRenderingContext& aContext)
{
nscoord totalWidth = 0;
nscoord spaceWidth;
aContext.SetTextRunRTL(PR_FALSE);
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 =
nsLayoutUtils::GetStringWidth(this, &aContext, aString, len);
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;
}
}
return totalWidth;
}
// 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);
nsLayoutUtils::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;
if (!aPresContext->BidiEnabled() && HasRTLChars(aAltText)) {
aPresContext->SetBidiEnabled();
}
// 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
nscoord strWidth = MeasureString(str, strLen, aRect.width, maxFit,
aRenderingContext);
// Display the text
nsresult rv = NS_ERROR_FAILURE;
if (aPresContext->BidiEnabled()) {
nsBidiPresUtils* bidiUtils = aPresContext->GetBidiUtils();
if (bidiUtils) {
const nsStyleVisibility* vis = GetStyleVisibility();
if (vis->mDirection == NS_STYLE_DIRECTION_RTL)
rv = bidiUtils->RenderText(str, maxFit, NSBIDI_RTL,
aPresContext, aRenderingContext,
aRect.XMost() - strWidth, y + maxAscent);
else
rv = bidiUtils->RenderText(str, maxFit, NSBIDI_LTR,
aPresContext, aRenderingContext,
aRect.x, y + maxAscent);
}
}
if (NS_FAILED(rv))
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, nsPresContext* aPresContext)
: nsStyleBorder(aPresContext)
{
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(nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
imgIRequest* aRequest,
nsPoint aPt)
{
// We should definitely have a gIconLoad here.
NS_ABORT_IF_FALSE(gIconLoad, "How did we succeed in Init then?");
// Calculate the inner area
nsRect inner = GetInnerArea() + aPt;
// Display a recessed one pixel border
nscoord borderEdgeWidth = nsPresContext::CSSPixelsToAppUnits(ALT_BORDER_WIDTH);
// if inner area is empty, then make it big enough for at least the icon
if (inner.IsEmpty()){
inner.SizeTo(2*(nsPresContext::CSSPixelsToAppUnits(ICON_SIZE+ICON_PADDING+ALT_BORDER_WIDTH)),
2*(nsPresContext::CSSPixelsToAppUnits(ICON_SIZE+ICON_PADDING+ALT_BORDER_WIDTH)));
}
// 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, PresContext());
nsCSSRendering::PaintBorderWithStyleBorder(PresContext(), aRenderingContext,
this, inner, inner,
recessedBorder, mStyleContext);
// Adjust the inner rect to account for the one pixel recessed border,
// and a six pixel padding on each edge
inner.Deflate(nsPresContext::CSSPixelsToAppUnits(ICON_PADDING+ALT_BORDER_WIDTH),
nsPresContext::CSSPixelsToAppUnits(ICON_PADDING+ALT_BORDER_WIDTH));
if (inner.IsEmpty()) {
return;
}
// Clip so we don't render outside the inner rect
aRenderingContext.PushState();
aRenderingContext.SetClipRect(inner, nsClipCombine_kIntersect);
// Check if we should display image placeholders
if (gIconLoad->mPrefShowPlaceholders) {
const nsStyleVisibility* vis = GetStyleVisibility();
nscoord size = nsPresContext::CSSPixelsToAppUnits(ICON_SIZE);
PRBool iconUsed = PR_FALSE;
// If we weren't previously displaying an icon, register ourselves
// as an observer for load and animation updates and flag that we're
// doing so now.
if (aRequest && !mDisplayingIcon) {
gIconLoad->AddIconObserver(this);
mDisplayingIcon = PR_TRUE;
}
// If the image in question is loaded and decoded, draw it
PRUint32 imageStatus = 0;
if (aRequest)
aRequest->GetImageStatus(&imageStatus);
if (imageStatus & imgIRequest::STATUS_FRAME_COMPLETE) {
nsCOMPtr<imgIContainer> imgCon;
aRequest->GetImage(getter_AddRefs(imgCon));
NS_ABORT_IF_FALSE(imgCon, "Frame Complete, but no image container?");
nsRect dest((vis->mDirection == NS_STYLE_DIRECTION_RTL) ?
inner.XMost() - size : inner.x,
inner.y, size, size);
nsLayoutUtils::DrawSingleImage(&aRenderingContext, imgCon,
nsLayoutUtils::GetGraphicsFilterForFrame(this), dest, aDirtyRect,
imgIContainer::FLAG_NONE);
iconUsed = PR_TRUE;
}
// if we could not draw the icon, flag that we're waiting for it and
// just draw some graffiti in the mean time
if (!iconUsed) {
nscolor oldColor;
nscoord iconXPos = (vis->mDirection == NS_STYLE_DIRECTION_RTL) ?
inner.XMost() - size : inner.x;
nscoord twoPX = nsPresContext::CSSPixelsToAppUnits(2);
aRenderingContext.DrawRect(iconXPos, inner.y,size,size);
aRenderingContext.GetColor(oldColor);
aRenderingContext.SetColor(NS_RGB(0xFF,0,0));
aRenderingContext.FillEllipse(size/2 + iconXPos, size/2 + inner.y,
size/2 - twoPX, size/2 - twoPX);
aRenderingContext.SetColor(oldColor);
}
// Reduce the inner rect by the width of the icon, and leave an
// additional ICON_PADDING pixels for padding
PRInt32 iconWidth = nsPresContext::CSSPixelsToAppUnits(ICON_SIZE + ICON_PADDING);
if (vis->mDirection != NS_STYLE_DIRECTION_RTL)
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(PresContext(), aRenderingContext, altText, inner);
}
}
aRenderingContext.PopState();
}
static void PaintAltFeedback(nsIFrame* aFrame, nsIRenderingContext* aCtx,
const nsRect& aDirtyRect, nsPoint aPt)
{
nsImageFrame* f = static_cast<nsImageFrame*>(aFrame);
f->DisplayAltFeedback(*aCtx,
aDirtyRect,
IMAGE_OK(f->GetContent()->IntrinsicState(), PR_TRUE)
? nsImageFrame::gIconLoad->mLoadingImage
: nsImageFrame::gIconLoad->mBrokenImage,
aPt);
}
#ifdef NS_DEBUG
static void PaintDebugImageMap(nsIFrame* aFrame, nsIRenderingContext* aCtx,
const nsRect& aDirtyRect, nsPoint aPt) {
nsImageFrame* f = static_cast<nsImageFrame*>(aFrame);
nsRect inner = f->GetInnerArea() + aPt;
nsPresContext* pc = f->PresContext();
aCtx->SetColor(NS_RGB(0, 0, 0));
aCtx->PushState();
aCtx->Translate(inner.x, inner.y);
f->GetImageMap(pc)->Draw(aFrame, *aCtx);
aCtx->PopState();
}
#endif
/**
* Note that nsDisplayImage does not receive events. However, an image element
* is replaced content so its background will be z-adjacent to the
* image itself, and hence receive events just as if the image itself
* received events.
*/
class nsDisplayImage : public nsDisplayItem {
public:
nsDisplayImage(nsImageFrame* aFrame, imgIContainer* aImage)
: nsDisplayItem(aFrame), mImage(aImage) {
MOZ_COUNT_CTOR(nsDisplayImage);
}
virtual ~nsDisplayImage() {
MOZ_COUNT_DTOR(nsDisplayImage);
}
virtual void Paint(nsDisplayListBuilder* aBuilder,
nsIRenderingContext* aCtx);
NS_DISPLAY_DECL_NAME("Image", TYPE_IMAGE)
private:
nsCOMPtr<imgIContainer> mImage;
};
void
nsDisplayImage::Paint(nsDisplayListBuilder* aBuilder,
nsIRenderingContext* aCtx) {
static_cast<nsImageFrame*>(mFrame)->
PaintImage(*aCtx, aBuilder->ToReferenceFrame(mFrame), mVisibleRect, mImage,
aBuilder->ShouldSyncDecodeImages()
? (PRUint32) imgIContainer::FLAG_SYNC_DECODE
: (PRUint32) imgIContainer::FLAG_NONE);
}
void
nsImageFrame::PaintImage(nsIRenderingContext& aRenderingContext, nsPoint aPt,
const nsRect& aDirtyRect, imgIContainer* aImage,
PRUint32 aFlags)
{
// Render the image into our content area (the area inside
// the borders and padding)
NS_ASSERTION(GetInnerArea().width == mComputedSize.width, "bad width");
nsRect inner = GetInnerArea() + aPt;
nsRect dest(inner.TopLeft(), mComputedSize);
dest.y -= GetContinuationOffset();
nsLayoutUtils::DrawSingleImage(&aRenderingContext, aImage,
nsLayoutUtils::GetGraphicsFilterForFrame(this), dest, aDirtyRect,
aFlags);
nsPresContext* presContext = PresContext();
nsImageMap* map = GetImageMap(presContext);
if (nsnull != map) {
aRenderingContext.PushState();
aRenderingContext.SetColor(NS_RGB(0, 0, 0));
aRenderingContext.SetLineStyle(nsLineStyle_kDotted);
aRenderingContext.Translate(inner.x, inner.y);
map->Draw(this, aRenderingContext);
aRenderingContext.PopState();
}
}
NS_IMETHODIMP
nsImageFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
if (!IsVisibleForPainting(aBuilder))
return NS_OK;
// REVIEW: We don't need any special logic here for deciding which layer
// to put the background in ... it goes in aLists.BorderBackground() and
// then if we have a block parent, it will put our background in the right
// place.
nsresult rv = DisplayBorderBackgroundOutline(aBuilder, aLists);
NS_ENSURE_SUCCESS(rv, rv);
// REVIEW: Checking mRect.IsEmpty() makes no sense to me, so I removed it.
// It can't have been protecting us against bad situations with zero-size
// images since adding a border would make the rect non-empty.
if (mComputedSize.width != 0 && mComputedSize.height != 0) {
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mContent);
NS_ASSERTION(imageLoader, "Not an image loading content?");
nsCOMPtr<imgIRequest> currentRequest;
if (imageLoader) {
imageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(currentRequest));
}
PRInt32 contentState = mContent->IntrinsicState();
PRBool imageOK = IMAGE_OK(contentState, PR_TRUE);
nsCOMPtr<imgIContainer> imgCon;
if (currentRequest) {
currentRequest->GetImage(getter_AddRefs(imgCon));
}
// Determine if the size is available
PRBool haveSize = PR_FALSE;
PRUint32 imageStatus = 0;
if (currentRequest)
currentRequest->GetImageStatus(&imageStatus);
if (imageStatus & imgIRequest::STATUS_SIZE_AVAILABLE)
haveSize = PR_TRUE;
// We should never have the size and not have an image container
NS_ABORT_IF_FALSE(!haveSize || imgCon, "Have size but not container?");
if (!imageOK || !haveSize) {
// No image yet, or image load failed. Draw the alt-text and an icon
// indicating the status
rv = aLists.Content()->AppendNewToTop(new (aBuilder)
nsDisplayGeneric(this, PaintAltFeedback, "AltFeedback",
nsDisplayItem::TYPE_ALT_FEEDBACK));
NS_ENSURE_SUCCESS(rv, rv);
}
else {
rv = aLists.Content()->AppendNewToTop(new (aBuilder)
nsDisplayImage(this, imgCon));
NS_ENSURE_SUCCESS(rv, rv);
// If we were previously displaying an icon, we're not anymore
if (mDisplayingIcon) {
gIconLoad->RemoveIconObserver(this);
mDisplayingIcon = PR_FALSE;
}
#ifdef DEBUG
if (GetShowFrameBorders() && GetImageMap(PresContext())) {
rv = aLists.Outlines()->AppendNewToTop(new (aBuilder)
nsDisplayGeneric(this, PaintDebugImageMap, "DebugImageMap",
nsDisplayItem::TYPE_DEBUG_IMAGE_MAP));
NS_ENSURE_SUCCESS(rv, rv);
}
#endif
}
}
// XXX what on EARTH is this code for?
nsresult result;
nsPresContext* presContext = PresContext();
PRInt16 displaySelection = presContext->PresShell()->GetSelectionFlags();
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(presContext, 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 DisplaySelectionOverlay(aBuilder, aLists,
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, nsGkAtoms::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;
}
PRBool
nsImageFrame::IsServerImageMap()
{
return mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::ismap);
}
// Translate an point that is relative to our frame
// 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,
nsIntPoint& aResult)
{
nscoord x = aPoint.x;
nscoord y = aPoint.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;
aResult.x = nsPresContext::AppUnitsToIntCSSPixels(x);
aResult.y = nsPresContext::AppUnitsToIntCSSPixels(y);
}
PRBool
nsImageFrame::GetAnchorHREFTargetAndNode(nsIURI** aHref, nsString& aTarget,
nsIContent** aNode)
{
PRBool status = PR_FALSE;
aTarget.Truncate();
*aHref = nsnull;
*aNode = nsnull;
// 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) {
nsCOMPtr<nsIURI> href = content->GetHrefURI();
if (href) {
href->Clone(aHref);
}
status = (*aHref != nsnull);
nsCOMPtr<nsIDOMHTMLAnchorElement> anchor(do_QueryInterface(content));
if (anchor) {
anchor->GetTarget(aTarget);
}
NS_ADDREF(*aNode = content);
break;
}
}
return status;
}
NS_IMETHODIMP
nsImageFrame::GetContentForEvent(nsPresContext* aPresContext,
nsEvent* aEvent,
nsIContent** aContent)
{
NS_ENSURE_ARG_POINTER(aContent);
nsIFrame* f = nsLayoutUtils::GetNonGeneratedAncestor(this);
if (f != this) {
return f->GetContentForEvent(aPresContext, aEvent, aContent);
}
// XXX We need to make this special check for area element's capturing the
// mouse due to bug 135040. Remove it once that's fixed.
nsIContent* capturingContent =
NS_IS_MOUSE_EVENT(aEvent) ? nsIPresShell::GetCapturingContent() : nsnull;
if (capturingContent && capturingContent->GetPrimaryFrame() == this) {
*aContent = capturingContent;
NS_IF_ADDREF(*aContent);
return NS_OK;
}
nsImageMap* map;
map = GetImageMap(aPresContext);
if (nsnull != map) {
nsIntPoint p;
TranslateEventCoords(
nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, this), 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;
if ((aEvent->eventStructType == NS_MOUSE_EVENT &&
aEvent->message == NS_MOUSE_BUTTON_UP &&
static_cast<nsMouseEvent*>(aEvent)->button == nsMouseEvent::eLeftButton) ||
aEvent->message == NS_MOUSE_MOVE) {
map = GetImageMap(aPresContext);
PRBool isServerMap = IsServerImageMap();
if ((nsnull != map) || isServerMap) {
nsIntPoint p;
TranslateEventCoords(
nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, this), 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;
nsCOMPtr<nsIContent> anchorNode;
if (GetAnchorHREFTargetAndNode(getter_AddRefs(uri), target,
getter_AddRefs(anchorNode))) {
// 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_BUTTON_UP) {
*aEventStatus = nsEventStatus_eConsumeDoDefault;
clicked = PR_TRUE;
}
nsContentUtils::TriggerLink(anchorNode, aPresContext, uri, target,
clicked, PR_TRUE);
}
}
}
}
return nsSplittableFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
}
NS_IMETHODIMP
nsImageFrame::GetCursor(const nsPoint& aPoint,
nsIFrame::Cursor& aCursor)
{
nsPresContext* context = PresContext();
nsImageMap* map = GetImageMap(context);
if (nsnull != map) {
nsIntPoint 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 =
PresContext()->PresShell()->StyleSet()->
ResolveStyleFor(area->AsElement(), 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(PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aModType)
{
nsresult rv = nsSplittableFrame::AttributeChanged(aNameSpaceID,
aAttribute, aModType);
if (NS_FAILED(rv)) {
return rv;
}
if (nsGkAtoms::alt == aAttribute)
{
PresContext()->PresShell()->FrameNeedsReflow(this,
nsIPresShell::eStyleChange,
NS_FRAME_IS_DIRTY);
}
return NS_OK;
}
nsIAtom*
nsImageFrame::GetType() const
{
return nsGkAtoms::imageFrame;
}
#ifdef DEBUG
NS_IMETHODIMP
nsImageFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("ImageFrame"), aResult);
}
NS_IMETHODIMP
nsImageFrame::List(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]", (void*)GetView());
}
fprintf(out, " {%d,%d,%d,%d}", mRect.x, mRect.y, mRect.width, mRect.height);
if (0 != mState) {
fprintf(out, " [state=%016llx]", mState);
}
fprintf(out, " [content=%p]", (void*)mContent);
fprintf(out, " [sc=%p]", static_cast<void*>(mStyleContext));
// 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
PRIntn
nsImageFrame::GetSkipSides() const
{
PRIntn skip = 0;
if (nsnull != GetPrevInFlow()) {
skip |= 1 << NS_SIDE_TOP;
}
if (nsnull != GetNextInFlow()) {
skip |= 1 << NS_SIDE_BOTTOM;
}
return skip;
}
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) {
rv = CallGetService(NS_IOSERVICE_CONTRACTID, &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,
gIconLoad,
nsnull, /* Not associated with any particular document */
loadFlags,
nsnull,
nsnull,
nsnull, /* channel policy not needed */
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-resources/loading-image.png");
NS_NAMED_LITERAL_STRING(brokenSrc,"resource://gre-resources/broken-image.png");
gIconLoad = new IconLoad();
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));
if (NS_FAILED(rv)) {
return rv;
}
rv = LoadIcon(brokenSrc,
aPresContext,
getter_AddRefs(gIconLoad->mBrokenImage));
return rv;
}
NS_IMPL_ISUPPORTS2(nsImageFrame::IconLoad, nsIObserver,
imgIDecoderObserver)
static const char kIconLoadPrefs[][40] = {
"browser.display.force_inline_alttext",
"browser.display.show_image_placeholders"
};
nsImageFrame::IconLoad::IconLoad()
{
nsIPrefBranch2* prefBranch = 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_IMETHODIMP
nsImageFrame::IconLoad::OnStartRequest(imgIRequest *aRequest)
{
return NS_OK;
}
NS_IMETHODIMP
nsImageFrame::IconLoad::OnStartDecode(imgIRequest *aRequest)
{
return NS_OK;
}
NS_IMETHODIMP
nsImageFrame::IconLoad::OnStartContainer(imgIRequest *aRequest,
imgIContainer *aContainer)
{
return NS_OK;
}
NS_IMETHODIMP
nsImageFrame::IconLoad::OnStartFrame(imgIRequest *aRequest,
PRUint32 aFrame)
{
return NS_OK;
}
NS_IMETHODIMP
nsImageFrame::IconLoad::OnDataAvailable(imgIRequest *aRequest,
PRBool aCurrentFrame,
const nsIntRect * aRect)
{
return NS_OK;
}
NS_IMETHODIMP
nsImageFrame::IconLoad::OnStopFrame(imgIRequest *aRequest,
PRUint32 aFrame)
{
return NS_OK;
}
NS_IMETHODIMP
nsImageFrame::IconLoad::OnStopContainer(imgIRequest *aRequest,
imgIContainer *aContainer)
{
return NS_OK;
}
NS_IMETHODIMP
nsImageFrame::IconLoad::OnStopDecode(imgIRequest *aRequest,
nsresult status,
const PRUnichar *statusArg)
{
return NS_OK;
}
NS_IMETHODIMP
nsImageFrame::IconLoad::OnStopRequest(imgIRequest *aRequest,
PRBool aIsLastPart)
{
nsTObserverArray<nsImageFrame*>::ForwardIterator iter(mIconObservers);
nsImageFrame *frame;
while (iter.HasMore()) {
frame = iter.GetNext();
frame->Invalidate(frame->GetRect());
}
return NS_OK;
}
NS_IMETHODIMP
nsImageFrame::IconLoad::OnDiscard(imgIRequest *aRequest)
{
return NS_OK;
}
NS_IMETHODIMP
nsImageFrame::IconLoad::FrameChanged(imgIContainer *aContainer,
nsIntRect * aDirtyRect)
{
nsTObserverArray<nsImageFrame*>::ForwardIterator iter(mIconObservers);
nsImageFrame *frame;
while (iter.HasMore()) {
frame = iter.GetNext();
frame->Invalidate(frame->GetRect());
}
return NS_OK;
}
NS_IMPL_ISUPPORTS2(nsImageListener, imgIDecoderObserver, imgIContainerObserver)
nsImageListener::nsImageListener(nsImageFrame *aFrame) :
mFrame(aFrame)
{
}
nsImageListener::~nsImageListener()
{
}
NS_IMETHODIMP nsImageListener::OnStartContainer(imgIRequest *aRequest,
imgIContainer *aImage)
{
if (!mFrame)
return NS_ERROR_FAILURE;
return mFrame->OnStartContainer(aRequest, aImage);
}
NS_IMETHODIMP nsImageListener::OnDataAvailable(imgIRequest *aRequest,
PRBool aCurrentFrame,
const nsIntRect *aRect)
{
if (!mFrame)
return NS_ERROR_FAILURE;
return mFrame->OnDataAvailable(aRequest, aCurrentFrame, aRect);
}
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,
nsIntRect * dirtyRect)
{
if (!mFrame)
return NS_ERROR_FAILURE;
return mFrame->FrameChanged(aContainer, dirtyRect);
}
static PRBool
IsInAutoWidthTableCellForQuirk(nsIFrame *aFrame)
{
if (eCompatibility_NavQuirks != aFrame->PresContext()->CompatibilityMode())
return PR_FALSE;
// Check if the parent of the closest nsBlockFrame has auto width.
nsBlockFrame *ancestor = nsLayoutUtils::FindNearestBlockAncestor(aFrame);
if (ancestor->GetStyleContext()->GetPseudo() == nsCSSAnonBoxes::cellContent) {
// Assume direct parent is a table cell frame.
nsFrame *grandAncestor = static_cast<nsFrame*>(ancestor->GetParent());
return grandAncestor &&
grandAncestor->GetStylePosition()->mWidth.GetUnit() == eStyleUnit_Auto;
}
return PR_FALSE;
}
/* virtual */ void
nsImageFrame::AddInlineMinWidth(nsIRenderingContext *aRenderingContext,
nsIFrame::InlineMinWidthData *aData)
{
NS_ASSERTION(GetParent(), "Must have a parent if we get here!");
PRBool canBreak =
!CanContinueTextRun() &&
GetParent()->GetStyleText()->WhiteSpaceCanWrap() &&
!IsInAutoWidthTableCellForQuirk(this);
if (canBreak)
aData->OptionallyBreak(aRenderingContext);
aData->trailingWhitespace = 0;
aData->skipWhitespace = PR_FALSE;
aData->trailingTextFrame = nsnull;
aData->currentLine += nsLayoutUtils::IntrinsicForContainer(aRenderingContext,
this, nsLayoutUtils::MIN_WIDTH);
aData->atStartOfLine = PR_FALSE;
if (canBreak)
aData->OptionallyBreak(aRenderingContext);
}
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