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be1535321a
Compute the amount of text in the scope of an nsFontInflationData object. This walks the text that's inside of the block formatting context at which this object is rooted, excluding the text that's inside any nested BFC. Using the amount of text, the font sizes of the text, and the line threshold preference, we compute whether to enable font size inflation within that block formatting context.
343 lines
12 KiB
C++
343 lines
12 KiB
C++
/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the font size inflation manager.
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*
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* The Initial Developer of the Original Code is the Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2012
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* Per-block-formatting-context manager of font size inflation for pan and zoom UI. */
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#include "nsFontInflationData.h"
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#include "FramePropertyTable.h"
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#include "nsTextFragment.h"
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#include "nsIFormControlFrame.h"
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#include "nsHTMLReflowState.h"
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#include "nsTextFrameUtils.h"
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using namespace mozilla;
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using namespace mozilla::layout;
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static void
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DestroyFontInflationData(void *aPropertyValue)
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{
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delete static_cast<nsFontInflationData*>(aPropertyValue);
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}
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NS_DECLARE_FRAME_PROPERTY(FontInflationDataProperty, DestroyFontInflationData);
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/* static */ nsFontInflationData*
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nsFontInflationData::FindFontInflationDataFor(const nsIFrame *aFrame)
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{
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// We have one set of font inflation data per block formatting context.
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const nsIFrame *bfc = FlowRootFor(aFrame);
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NS_ASSERTION(bfc->GetStateBits() & NS_FRAME_FONT_INFLATION_FLOW_ROOT,
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"should have found a flow root");
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return static_cast<nsFontInflationData*>(
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bfc->Properties().Get(FontInflationDataProperty()));
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}
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/* static */ void
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nsFontInflationData::UpdateFontInflationDataWidthFor(const nsHTMLReflowState& aReflowState)
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{
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nsIFrame *bfc = aReflowState.frame;
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NS_ASSERTION(bfc->GetStateBits() & NS_FRAME_FONT_INFLATION_FLOW_ROOT,
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"should have been given a flow root");
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FrameProperties bfcProps(bfc->Properties());
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nsFontInflationData *data = static_cast<nsFontInflationData*>(
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bfcProps.Get(FontInflationDataProperty()));
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if (!data) {
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data = new nsFontInflationData(bfc);
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bfcProps.Set(FontInflationDataProperty(), data);
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}
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data->UpdateWidth(aReflowState);
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}
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/* static */ void
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nsFontInflationData::MarkFontInflationDataTextDirty(nsIFrame *aBFCFrame)
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{
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NS_ASSERTION(aBFCFrame->GetStateBits() & NS_FRAME_FONT_INFLATION_FLOW_ROOT,
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"should have been given a flow root");
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FrameProperties bfcProps(aBFCFrame->Properties());
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nsFontInflationData *data = static_cast<nsFontInflationData*>(
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bfcProps.Get(FontInflationDataProperty()));
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if (data) {
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data->MarkTextDirty();
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}
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}
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nsFontInflationData::nsFontInflationData(nsIFrame *aBFCFrame)
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: mBFCFrame(aBFCFrame)
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, mTextAmount(0)
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, mTextThreshold(0)
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, mInflationEnabled(false)
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, mTextDirty(true)
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{
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}
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/**
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* Find the closest common ancestor between aFrame1 and aFrame2, except
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* treating the parent of a frame as the first-in-flow of its parent (so
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* the result doesn't change when breaking changes).
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*
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* aKnownCommonAncestor is a known common ancestor of both.
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*/
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static nsIFrame*
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NearestCommonAncestorFirstInFlow(nsIFrame *aFrame1, nsIFrame *aFrame2,
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nsIFrame *aKnownCommonAncestor)
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{
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aFrame1 = aFrame1->GetFirstInFlow();
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aFrame2 = aFrame2->GetFirstInFlow();
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aKnownCommonAncestor = aKnownCommonAncestor->GetFirstInFlow();
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nsAutoTArray<nsIFrame*, 32> ancestors1, ancestors2;
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for (nsIFrame *f = aFrame1; f != aKnownCommonAncestor;
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(f = f->GetParent()) && (f = f->GetFirstInFlow())) {
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ancestors1.AppendElement(f);
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}
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for (nsIFrame *f = aFrame2; f != aKnownCommonAncestor;
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(f = f->GetParent()) && (f = f->GetFirstInFlow())) {
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ancestors2.AppendElement(f);
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}
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nsIFrame *result = aKnownCommonAncestor;
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PRUint32 i1 = ancestors1.Length(),
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i2 = ancestors2.Length();
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while (i1-- != 0 && i2-- != 0) {
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if (ancestors1[i1] != ancestors2[i2]) {
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break;
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}
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result = ancestors1[i1];
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}
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return result;
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}
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static nscoord
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ComputeDescendantWidth(const nsHTMLReflowState& aAncestorReflowState,
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nsIFrame *aDescendantFrame)
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{
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nsIFrame *ancestorFrame = aAncestorReflowState.frame->GetFirstInFlow();
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if (aDescendantFrame == ancestorFrame) {
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return aAncestorReflowState.ComputedWidth();
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}
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AutoInfallibleTArray<nsIFrame*, 16> frames;
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for (nsIFrame *f = aDescendantFrame; f != ancestorFrame;
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f = f->GetParent()) {
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frames.AppendElement(f);
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}
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PRUint32 len = frames.Length();
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nsHTMLReflowState *reflowStates = static_cast<nsHTMLReflowState*>
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(moz_xmalloc(sizeof(nsHTMLReflowState) * len));
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nsPresContext *presContext = aDescendantFrame->PresContext();
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for (PRUint32 i = 0; i < len; ++i) {
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const nsHTMLReflowState &parentReflowState =
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(i == 0) ? aAncestorReflowState : reflowStates[i - 1];
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nsSize availSize(parentReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
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nsIFrame *frame = frames[len - i - 1];
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NS_ABORT_IF_FALSE(frame->GetParent()->GetFirstInFlow() ==
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parentReflowState.frame->GetFirstInFlow(),
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"bad logic in this function");
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new (reflowStates + i) nsHTMLReflowState(presContext, parentReflowState,
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frame, availSize);
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}
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NS_ABORT_IF_FALSE(reflowStates[len - 1].frame == aDescendantFrame,
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"bad logic in this function");
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nscoord result = reflowStates[len - 1].ComputedWidth();
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for (PRUint32 i = len; i-- != 0; ) {
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reflowStates[i].~nsHTMLReflowState();
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}
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moz_free(reflowStates);
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return result;
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}
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void
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nsFontInflationData::UpdateWidth(const nsHTMLReflowState &aReflowState)
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{
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nsIFrame *bfc = aReflowState.frame;
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NS_ASSERTION(bfc->GetStateBits() & NS_FRAME_FONT_INFLATION_FLOW_ROOT,
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"must be block formatting context");
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nsIFrame *firstInflatableDescendant =
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FindEdgeInflatableFrameIn(bfc, eFromStart);
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if (!firstInflatableDescendant) {
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mTextAmount = 0;
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mTextThreshold = 0; // doesn't matter
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mTextDirty = false;
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mInflationEnabled = false;
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return;
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}
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nsIFrame *lastInflatableDescendant =
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FindEdgeInflatableFrameIn(bfc, eFromEnd);
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NS_ABORT_IF_FALSE(!firstInflatableDescendant == !lastInflatableDescendant,
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"null-ness should match; NearestCommonAncestorFirstInFlow"
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" will crash when passed null");
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// Particularly when we're computing for the root BFC, the width of
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// nca might differ significantly for the width of bfc.
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nsIFrame *nca = NearestCommonAncestorFirstInFlow(firstInflatableDescendant,
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lastInflatableDescendant,
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bfc);
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while (!nsLayoutUtils::IsContainerForFontSizeInflation(nca)) {
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nca = nca->GetParent();
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}
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nscoord newNCAWidth = ComputeDescendantWidth(aReflowState, nca);
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// See comment above "font.size.inflation.lineThreshold" in
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// modules/libpref/src/init/all.js .
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PRUint32 lineThreshold = nsLayoutUtils::FontSizeInflationLineThreshold();
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nscoord newTextThreshold = (newNCAWidth * lineThreshold) / 100;
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if (mTextThreshold <= mTextAmount && mTextAmount < newTextThreshold) {
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// Because we truncate our scan when we hit sufficient text, we now
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// need to rescan.
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mTextDirty = true;
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}
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mTextThreshold = newTextThreshold;
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mInflationEnabled = mTextAmount >= mTextThreshold;
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}
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/* static */ nsIFrame*
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nsFontInflationData::FindEdgeInflatableFrameIn(nsIFrame* aFrame,
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SearchDirection aDirection)
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{
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// NOTE: This function has a similar structure to ScanTextIn!
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// FIXME: Should probably only scan the text that's actually going to
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// be inflated!
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nsIFormControlFrame* fcf = do_QueryFrame(aFrame);
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if (fcf) {
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return aFrame;
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}
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// FIXME: aDirection!
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nsAutoTArray<FrameChildList, 4> lists;
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aFrame->GetChildLists(&lists);
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for (PRUint32 i = 0, len = lists.Length(); i < len; ++i) {
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const nsFrameList& list =
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lists[(aDirection == eFromStart) ? i : len - i - 1].mList;
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for (nsIFrame *kid = (aDirection == eFromStart) ? list.FirstChild()
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: list.LastChild();
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kid;
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kid = (aDirection == eFromStart) ? kid->GetNextSibling()
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: kid->GetPrevSibling()) {
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if (kid->GetStateBits() & NS_FRAME_FONT_INFLATION_FLOW_ROOT) {
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// Goes in a different set of inflation data.
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continue;
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}
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if (kid->GetType() == nsGkAtoms::textFrame) {
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nsIContent *content = kid->GetContent();
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if (content && kid == content->GetPrimaryFrame()) {
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PRUint32 len = nsTextFrameUtils::
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ComputeApproximateLengthWithWhitespaceCompression(
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content, kid->GetStyleText());
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if (len != 0) {
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return kid;
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}
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}
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} else {
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nsIFrame *kidResult =
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FindEdgeInflatableFrameIn(kid, aDirection);
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if (kidResult) {
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return kidResult;
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}
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}
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}
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}
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return nsnull;
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}
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void
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nsFontInflationData::ScanText()
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{
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mTextDirty = false;
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mTextAmount = 0;
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ScanTextIn(mBFCFrame);
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mInflationEnabled = mTextAmount >= mTextThreshold;
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}
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void
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nsFontInflationData::ScanTextIn(nsIFrame *aFrame)
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{
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// NOTE: This function has a similar structure to FindEdgeInflatableFrameIn!
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// FIXME: Should probably only scan the text that's actually going to
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// be inflated!
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nsIFrame::ChildListIterator lists(aFrame);
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for (; !lists.IsDone(); lists.Next()) {
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nsFrameList::Enumerator kids(lists.CurrentList());
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for (; !kids.AtEnd(); kids.Next()) {
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nsIFrame *kid = kids.get();
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if (kid->GetStateBits() & NS_FRAME_FONT_INFLATION_FLOW_ROOT) {
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// Goes in a different set of inflation data.
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continue;
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}
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if (kid->GetType() == nsGkAtoms::textFrame) {
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nsIContent *content = kid->GetContent();
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if (content && kid == content->GetPrimaryFrame()) {
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PRUint32 len = nsTextFrameUtils::
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ComputeApproximateLengthWithWhitespaceCompression(
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content, kid->GetStyleText());
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if (len != 0) {
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nscoord fontSize = kid->GetStyleFont()->mFont.size;
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if (fontSize > 0) {
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mTextAmount += fontSize * len;
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}
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}
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}
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} else {
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// recursive step
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ScanTextIn(kid);
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}
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if (mTextAmount >= mTextThreshold) {
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return;
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}
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}
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}
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}
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