зеркало из https://github.com/mozilla/gecko-dev.git
439 строки
16 KiB
C++
439 строки
16 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsMathMLmpaddedFrame.h"
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#include "nsMathMLElement.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/TextUtils.h"
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#include <algorithm>
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using namespace mozilla;
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//
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// <mpadded> -- adjust space around content - implementation
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//
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#define NS_MATHML_SIGN_INVALID -1 // if the attribute is not there
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#define NS_MATHML_SIGN_UNSPECIFIED 0
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#define NS_MATHML_SIGN_MINUS 1
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#define NS_MATHML_SIGN_PLUS 2
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#define NS_MATHML_PSEUDO_UNIT_UNSPECIFIED 0
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#define NS_MATHML_PSEUDO_UNIT_ITSELF 1 // special
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#define NS_MATHML_PSEUDO_UNIT_WIDTH 2
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#define NS_MATHML_PSEUDO_UNIT_HEIGHT 3
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#define NS_MATHML_PSEUDO_UNIT_DEPTH 4
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#define NS_MATHML_PSEUDO_UNIT_NAMEDSPACE 5
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nsIFrame* NS_NewMathMLmpaddedFrame(nsIPresShell* aPresShell,
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ComputedStyle* aStyle) {
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return new (aPresShell)
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nsMathMLmpaddedFrame(aStyle, aPresShell->GetPresContext());
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmpaddedFrame)
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nsMathMLmpaddedFrame::~nsMathMLmpaddedFrame() {}
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NS_IMETHODIMP
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nsMathMLmpaddedFrame::InheritAutomaticData(nsIFrame* aParent) {
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// let the base class get the default from our parent
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nsMathMLContainerFrame::InheritAutomaticData(aParent);
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mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY;
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return NS_OK;
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}
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void nsMathMLmpaddedFrame::ProcessAttributes() {
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// clang-format off
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/*
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parse the attributes
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width = [+|-] unsigned-number (% [pseudo-unit] | pseudo-unit | h-unit | namedspace)
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height = [+|-] unsigned-number (% [pseudo-unit] | pseudo-unit | v-unit | namedspace)
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depth = [+|-] unsigned-number (% [pseudo-unit] | pseudo-unit | v-unit | namedspace)
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lspace = [+|-] unsigned-number (% [pseudo-unit] | pseudo-unit | h-unit | namedspace)
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voffset= [+|-] unsigned-number (% [pseudo-unit] | pseudo-unit | v-unit | namedspace)
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*/
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// clang-format on
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nsAutoString value;
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// width
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mWidthSign = NS_MATHML_SIGN_INVALID;
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mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::width, value);
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if (!value.IsEmpty()) {
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if (!ParseAttribute(value, mWidthSign, mWidth, mWidthPseudoUnit)) {
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ReportParseError(nsGkAtoms::width->GetUTF16String(), value.get());
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}
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}
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// height
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mHeightSign = NS_MATHML_SIGN_INVALID;
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mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::height, value);
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if (!value.IsEmpty()) {
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if (!ParseAttribute(value, mHeightSign, mHeight, mHeightPseudoUnit)) {
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ReportParseError(nsGkAtoms::height->GetUTF16String(), value.get());
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}
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}
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// depth
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mDepthSign = NS_MATHML_SIGN_INVALID;
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mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::depth_, value);
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if (!value.IsEmpty()) {
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if (!ParseAttribute(value, mDepthSign, mDepth, mDepthPseudoUnit)) {
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ReportParseError(nsGkAtoms::depth_->GetUTF16String(), value.get());
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}
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}
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// lspace
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mLeadingSpaceSign = NS_MATHML_SIGN_INVALID;
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mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::lspace_, value);
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if (!value.IsEmpty()) {
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if (!ParseAttribute(value, mLeadingSpaceSign, mLeadingSpace,
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mLeadingSpacePseudoUnit)) {
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ReportParseError(nsGkAtoms::lspace_->GetUTF16String(), value.get());
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}
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}
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// voffset
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mVerticalOffsetSign = NS_MATHML_SIGN_INVALID;
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mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::voffset_, value);
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if (!value.IsEmpty()) {
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if (!ParseAttribute(value, mVerticalOffsetSign, mVerticalOffset,
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mVerticalOffsetPseudoUnit)) {
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ReportParseError(nsGkAtoms::voffset_->GetUTF16String(), value.get());
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}
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}
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}
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// parse an input string in the following format (see bug 148326 for testcases):
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// [+|-] unsigned-number (% [pseudo-unit] | pseudo-unit | css-unit | namedspace)
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bool nsMathMLmpaddedFrame::ParseAttribute(nsString& aString, int32_t& aSign,
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nsCSSValue& aCSSValue,
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int32_t& aPseudoUnit) {
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aCSSValue.Reset();
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aSign = NS_MATHML_SIGN_INVALID;
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aPseudoUnit = NS_MATHML_PSEUDO_UNIT_UNSPECIFIED;
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aString.CompressWhitespace(); // aString is not a const in this code
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int32_t stringLength = aString.Length();
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if (!stringLength) return false;
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nsAutoString number, unit;
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//////////////////////
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// see if the sign is there
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int32_t i = 0;
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if (aString[0] == '+') {
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aSign = NS_MATHML_SIGN_PLUS;
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i++;
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} else if (aString[0] == '-') {
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aSign = NS_MATHML_SIGN_MINUS;
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i++;
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} else
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aSign = NS_MATHML_SIGN_UNSPECIFIED;
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// get the number
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bool gotDot = false, gotPercent = false;
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for (; i < stringLength; i++) {
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char16_t c = aString[i];
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if (gotDot && c == '.') {
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// error - two dots encountered
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aSign = NS_MATHML_SIGN_INVALID;
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return false;
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}
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if (c == '.')
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gotDot = true;
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else if (!IsAsciiDigit(c)) {
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break;
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}
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number.Append(c);
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}
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// catch error if we didn't enter the loop above... we could simply initialize
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// floatValue = 1, to cater for cases such as width="height", but that
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// wouldn't be in line with the spec which requires an explicit number
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if (number.IsEmpty()) {
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aSign = NS_MATHML_SIGN_INVALID;
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return false;
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}
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nsresult errorCode;
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float floatValue = number.ToFloat(&errorCode);
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if (NS_FAILED(errorCode)) {
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aSign = NS_MATHML_SIGN_INVALID;
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return false;
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}
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// see if this is a percentage-based value
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if (i < stringLength && aString[i] == '%') {
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i++;
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gotPercent = true;
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}
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// the remainder now should be a css-unit, or a pseudo-unit, or a named-space
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aString.Right(unit, stringLength - i);
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if (unit.IsEmpty()) {
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if (gotPercent) {
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// case ["+"|"-"] unsigned-number "%"
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aCSSValue.SetPercentValue(floatValue / 100.0f);
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aPseudoUnit = NS_MATHML_PSEUDO_UNIT_ITSELF;
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return true;
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} else {
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// case ["+"|"-"] unsigned-number
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// XXXfredw: should we allow non-zero unitless values? See bug 757703.
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if (!floatValue) {
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aCSSValue.SetFloatValue(floatValue, eCSSUnit_Number);
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aPseudoUnit = NS_MATHML_PSEUDO_UNIT_ITSELF;
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return true;
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}
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}
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} else if (unit.EqualsLiteral("width"))
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aPseudoUnit = NS_MATHML_PSEUDO_UNIT_WIDTH;
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else if (unit.EqualsLiteral("height"))
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aPseudoUnit = NS_MATHML_PSEUDO_UNIT_HEIGHT;
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else if (unit.EqualsLiteral("depth"))
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aPseudoUnit = NS_MATHML_PSEUDO_UNIT_DEPTH;
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else if (!gotPercent) { // percentage can only apply to a pseudo-unit
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// see if the unit is a named-space
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if (nsMathMLElement::ParseNamedSpaceValue(
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unit, aCSSValue, nsMathMLElement::PARSE_ALLOW_NEGATIVE)) {
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// re-scale properly, and we know that the unit of the named-space is 'em'
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floatValue *= aCSSValue.GetFloatValue();
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aCSSValue.SetFloatValue(floatValue, eCSSUnit_EM);
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aPseudoUnit = NS_MATHML_PSEUDO_UNIT_NAMEDSPACE;
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return true;
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}
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// see if the input was just a CSS value
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// We are not supposed to have a unitless, percent, negative or namedspace
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// value here.
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number.Append(unit); // leave the sign out if it was there
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if (nsMathMLElement::ParseNumericValue(
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number, aCSSValue, nsMathMLElement::PARSE_SUPPRESS_WARNINGS,
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nullptr))
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return true;
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}
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// if we enter here, we have a number that will act as a multiplier on a
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// pseudo-unit
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if (aPseudoUnit != NS_MATHML_PSEUDO_UNIT_UNSPECIFIED) {
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if (gotPercent)
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aCSSValue.SetPercentValue(floatValue / 100.0f);
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else
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aCSSValue.SetFloatValue(floatValue, eCSSUnit_Number);
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return true;
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}
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#ifdef DEBUG
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printf("mpadded: attribute with bad numeric value: %s\n",
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NS_LossyConvertUTF16toASCII(aString).get());
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#endif
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// if we reach here, it means we encounter an unexpected input
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aSign = NS_MATHML_SIGN_INVALID;
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return false;
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}
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void nsMathMLmpaddedFrame::UpdateValue(int32_t aSign, int32_t aPseudoUnit,
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const nsCSSValue& aCSSValue,
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const ReflowOutput& aDesiredSize,
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nscoord& aValueToUpdate,
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float aFontSizeInflation) const {
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nsCSSUnit unit = aCSSValue.GetUnit();
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if (NS_MATHML_SIGN_INVALID != aSign && eCSSUnit_Null != unit) {
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nscoord scaler = 0, amount = 0;
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if (eCSSUnit_Percent == unit || eCSSUnit_Number == unit) {
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switch (aPseudoUnit) {
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case NS_MATHML_PSEUDO_UNIT_WIDTH:
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scaler = aDesiredSize.Width();
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break;
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case NS_MATHML_PSEUDO_UNIT_HEIGHT:
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scaler = aDesiredSize.BlockStartAscent();
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break;
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case NS_MATHML_PSEUDO_UNIT_DEPTH:
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scaler = aDesiredSize.Height() - aDesiredSize.BlockStartAscent();
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break;
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default:
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// if we ever reach here, it would mean something is wrong
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// somewhere with the setup and/or the caller
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NS_ERROR("Unexpected Pseudo Unit");
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return;
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}
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}
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if (eCSSUnit_Number == unit)
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amount = NSToCoordRound(float(scaler) * aCSSValue.GetFloatValue());
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else if (eCSSUnit_Percent == unit)
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amount = NSToCoordRound(float(scaler) * aCSSValue.GetPercentValue());
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else
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amount = CalcLength(PresContext(), mComputedStyle, aCSSValue,
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aFontSizeInflation);
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if (NS_MATHML_SIGN_PLUS == aSign)
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aValueToUpdate += amount;
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else if (NS_MATHML_SIGN_MINUS == aSign)
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aValueToUpdate -= amount;
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else
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aValueToUpdate = amount;
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}
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}
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void nsMathMLmpaddedFrame::Reflow(nsPresContext* aPresContext,
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ReflowOutput& aDesiredSize,
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const ReflowInput& aReflowInput,
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nsReflowStatus& aStatus) {
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MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
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mPresentationData.flags &= ~NS_MATHML_ERROR;
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ProcessAttributes();
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///////////////
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// Let the base class format our content like an inferred mrow
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nsMathMLContainerFrame::Reflow(aPresContext, aDesiredSize, aReflowInput,
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aStatus);
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// NS_ASSERTION(aStatus.IsComplete(), "bad status");
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}
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/* virtual */ nsresult nsMathMLmpaddedFrame::Place(DrawTarget* aDrawTarget,
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bool aPlaceOrigin,
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ReflowOutput& aDesiredSize) {
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nsresult rv = nsMathMLContainerFrame::Place(aDrawTarget, false, aDesiredSize);
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if (NS_MATHML_HAS_ERROR(mPresentationData.flags) || NS_FAILED(rv)) {
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DidReflowChildren(PrincipalChildList().FirstChild());
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return rv;
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}
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nscoord height = aDesiredSize.BlockStartAscent();
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nscoord depth = aDesiredSize.Height() - aDesiredSize.BlockStartAscent();
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// The REC says:
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//
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// "The lspace attribute ('leading' space) specifies the horizontal location
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// of the positioning point of the child content with respect to the
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// positioning point of the mpadded element. By default they coincide, and
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// therefore absolute values for lspace have the same effect as relative
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// values."
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//
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// "MathML renderers should ensure that, except for the effects of the
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// attributes, the relative spacing between the contents of the mpadded
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// element and surrounding MathML elements would not be modified by replacing
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// an mpadded element with an mrow element with the same content, even if
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// linebreaking occurs within the mpadded element."
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//
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// (http://www.w3.org/TR/MathML/chapter3.html#presm.mpadded)
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//
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// "In those discussions, the terms leading and trailing are used to specify
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// a side of an object when which side to use depends on the directionality;
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// ie. leading means left in LTR but right in RTL."
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// (http://www.w3.org/TR/MathML/chapter3.html#presm.bidi.math)
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nscoord lspace = 0;
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// In MathML3, "width" will be the bounding box width and "advancewidth" will
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// refer "to the horizontal distance between the positioning point of the
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// mpadded and the positioning point for the following content". MathML2
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// doesn't make the distinction.
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nscoord width = aDesiredSize.Width();
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nscoord voffset = 0;
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int32_t pseudoUnit;
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nscoord initialWidth = width;
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float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(this);
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// update width
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pseudoUnit = (mWidthPseudoUnit == NS_MATHML_PSEUDO_UNIT_ITSELF)
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? NS_MATHML_PSEUDO_UNIT_WIDTH
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: mWidthPseudoUnit;
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UpdateValue(mWidthSign, pseudoUnit, mWidth, aDesiredSize, width,
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fontSizeInflation);
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width = std::max(0, width);
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// update "height" (this is the ascent in the terminology of the REC)
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pseudoUnit = (mHeightPseudoUnit == NS_MATHML_PSEUDO_UNIT_ITSELF)
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? NS_MATHML_PSEUDO_UNIT_HEIGHT
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: mHeightPseudoUnit;
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UpdateValue(mHeightSign, pseudoUnit, mHeight, aDesiredSize, height,
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fontSizeInflation);
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height = std::max(0, height);
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// update "depth" (this is the descent in the terminology of the REC)
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pseudoUnit = (mDepthPseudoUnit == NS_MATHML_PSEUDO_UNIT_ITSELF)
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? NS_MATHML_PSEUDO_UNIT_DEPTH
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: mDepthPseudoUnit;
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UpdateValue(mDepthSign, pseudoUnit, mDepth, aDesiredSize, depth,
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fontSizeInflation);
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depth = std::max(0, depth);
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// update lspace
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if (mLeadingSpacePseudoUnit != NS_MATHML_PSEUDO_UNIT_ITSELF) {
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pseudoUnit = mLeadingSpacePseudoUnit;
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UpdateValue(mLeadingSpaceSign, pseudoUnit, mLeadingSpace, aDesiredSize,
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lspace, fontSizeInflation);
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}
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// update voffset
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if (mVerticalOffsetPseudoUnit != NS_MATHML_PSEUDO_UNIT_ITSELF) {
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pseudoUnit = mVerticalOffsetPseudoUnit;
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UpdateValue(mVerticalOffsetSign, pseudoUnit, mVerticalOffset, aDesiredSize,
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voffset, fontSizeInflation);
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}
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// do the padding now that we have everything
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// The idea here is to maintain the invariant that <mpadded>...</mpadded>
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// (i.e., with no attributes) looks the same as <mrow>...</mrow>. But when
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// there are attributes, tweak our metrics and move children to achieve the
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// desired visual effects.
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if ((StyleVisibility()->mDirection ? mWidthSign : mLeadingSpaceSign) !=
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NS_MATHML_SIGN_INVALID) {
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// there was padding on the left. dismiss the left italic correction now
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// (so that our parent won't correct us)
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mBoundingMetrics.leftBearing = 0;
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}
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if ((StyleVisibility()->mDirection ? mLeadingSpaceSign : mWidthSign) !=
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NS_MATHML_SIGN_INVALID) {
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// there was padding on the right. dismiss the right italic correction now
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// (so that our parent won't correct us)
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mBoundingMetrics.width = width;
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mBoundingMetrics.rightBearing = mBoundingMetrics.width;
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}
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nscoord dx =
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(StyleVisibility()->mDirection ? width - initialWidth - lspace : lspace);
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aDesiredSize.SetBlockStartAscent(height);
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aDesiredSize.Width() = mBoundingMetrics.width;
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aDesiredSize.Height() = depth + aDesiredSize.BlockStartAscent();
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mBoundingMetrics.ascent = height;
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mBoundingMetrics.descent = depth;
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aDesiredSize.mBoundingMetrics = mBoundingMetrics;
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mReference.x = 0;
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mReference.y = aDesiredSize.BlockStartAscent();
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if (aPlaceOrigin) {
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// Finish reflowing child frames, positioning their origins.
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PositionRowChildFrames(dx, aDesiredSize.BlockStartAscent() - voffset);
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}
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return NS_OK;
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}
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/* virtual */ nsresult nsMathMLmpaddedFrame::MeasureForWidth(
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DrawTarget* aDrawTarget, ReflowOutput& aDesiredSize) {
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ProcessAttributes();
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return Place(aDrawTarget, false, aDesiredSize);
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}
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