static void
GetCharSpacing(nsMathMLChar* aMathMLChar,
nsOperatorFlags aForm,
PRInt32 aScriptLevel,
nscoord em,
nscoord& aLeftSpace,
nscoord& aRightSpace)
{
nsAutoString data;
aMathMLChar->GetData(data);
nsOperatorFlags flags = 0;
float lspace = 0.0f;
float rspace = 0.0f;
PRBool found = nsMathMLOperators::LookupOperator(data, aForm,
&flags, &lspace, &rspace);
// We don't want extra space when we are a script
if (found && aScriptLevel > 0) {
lspace /= 2.0f;
rspace /= 2.0f;
}
aLeftSpace = NSToCoordRound(lspace * em);
aRightSpace = NSToCoordRound(rspace * em);
}
/* static */ nscoord
nsMathMLFrame::CalcLength(nsPresContext* aPresContext,
nsStyleContext* aStyleContext,
const nsCSSValue& aCSSValue)
{
NS_ASSERTION(aCSSValue.IsLengthUnit(), "not a length unit");
if (aCSSValue.IsFixedLengthUnit()) {
return aCSSValue.GetLengthTwips();
}
nsCSSUnit unit = aCSSValue.GetUnit();
if (eCSSUnit_Pixel == unit) {
return NSFloatPixelsToTwips(aCSSValue.GetFloatValue(),
aPresContext->ScaledPixelsToTwips());
}
else if (eCSSUnit_EM == unit) {
const nsStyleFont* font = aStyleContext->GetStyleFont();
return NSToCoordRound(aCSSValue.GetFloatValue() * (float)font->mFont.size);
}
else if (eCSSUnit_XHeight == unit) {
nscoord xHeight;
const nsStyleFont* font = aStyleContext->GetStyleFont();
nsCOMPtr<nsIFontMetrics> fm = aPresContext->GetMetricsFor(font->mFont);
fm->GetXHeight(xHeight);
return NSToCoordRound(aCSSValue.GetFloatValue() * (float)xHeight);
}
return 0;
}
/* static */ nscoord
nsMathMLFrame::CalcLength(nsPresContext* aPresContext,
nsStyleContext* aStyleContext,
const nsCSSValue& aCSSValue)
{
NS_ASSERTION(aCSSValue.IsLengthUnit(), "not a length unit");
if (aCSSValue.IsFixedLengthUnit()) {
return aCSSValue.GetFixedLength(aPresContext);
}
if (aCSSValue.IsPixelLengthUnit()) {
return aCSSValue.GetPixelLength();
}
nsCSSUnit unit = aCSSValue.GetUnit();
if (eCSSUnit_EM == unit) {
const nsStyleFont* font = aStyleContext->GetStyleFont();
return NSToCoordRound(aCSSValue.GetFloatValue() * (float)font->mFont.size);
}
else if (eCSSUnit_XHeight == unit) {
nsRefPtr<nsFontMetrics> fm;
nsLayoutUtils::GetFontMetricsForStyleContext(aStyleContext,
getter_AddRefs(fm));
nscoord xHeight = fm->XHeight();
return NSToCoordRound(aCSSValue.GetFloatValue() * (float)xHeight);
}
// MathML doesn't specify other CSS units such as rem or ch
NS_ERROR("Unsupported unit");
return 0;
}
/* Performs the matrix multiplication necessary to multiply the two matrices,
* then hands back a reference to ourself.
*/
nsStyleTransformMatrix&
nsStyleTransformMatrix::operator *= (const nsStyleTransformMatrix &aOther)
{
/* We'll buffer all of our results into a temporary storage location
* during this operation since we don't want to overwrite the values of
* the old matrix with the values of the new.
*/
float newMatrix[4];
nscoord newDelta[2];
float newX[2];
float newY[2];
/* [this] [aOther]
* |a1 c1 e1| |a0 c0 e0| |a0a1 + b0c1 c0a1 + d0c1 e0a1 + f0c1 + e1|
* |b1 d1 f1|x|b0 d0 f0| = |a0b1 + b0d1 c0b1 + d0d1 e0b1 + f0d1 + f1|
* |0 0 1 | | 0 0 1| | 0 0 1|
*/
newMatrix[0] = aOther.mMain[0] * mMain[0] + aOther.mMain[1] * mMain[2];
newMatrix[1] = aOther.mMain[0] * mMain[1] + aOther.mMain[1] * mMain[3];
newMatrix[2] = aOther.mMain[2] * mMain[0] + aOther.mMain[3] * mMain[2];
newMatrix[3] = aOther.mMain[2] * mMain[1] + aOther.mMain[3] * mMain[3];
newDelta[0] = NSToCoordRound(aOther.mDelta[0] * mMain[0] +
aOther.mDelta[1] * mMain[2]) + mDelta[0];
newDelta[1] = NSToCoordRound(aOther.mDelta[0] * mMain[1] +
aOther.mDelta[1] * mMain[3]) + mDelta[1];
/* For consistent terminology, let u0, u1, v0, and v1 be the four transform
* coordinates from our matrix, and let x0, x1, y0, and y1 be the four
* transform coordinates from the other matrix. Then the new transform
* coordinates are:
*
* u0' = a1u0 + c1u1 + x0
* u1' = b1u0 + d1u1 + x1
* v0' = a1v0 + c1v1 + y0
* v1' = b1v0 + d1v1 + y1
*/
newX[0] = mMain[0] * aOther.mX[0] + mMain[2] * aOther.mX[1] + mX[0];
newX[1] = mMain[1] * aOther.mX[0] + mMain[3] * aOther.mX[1] + mX[1];
newY[0] = mMain[0] * aOther.mY[0] + mMain[2] * aOther.mY[1] + mY[0];
newY[1] = mMain[1] * aOther.mY[0] + mMain[3] * aOther.mY[1] + mY[1];
/* Now, write everything back in. */
for (PRInt32 index = 0; index < 4; ++index)
mMain[index] = newMatrix[index];
for (PRInt32 index = 0; index < 2; ++index) {
mDelta[index] = newDelta[index];
mX[index] = newX[index];
mY[index] = newY[index];
}
/* As promised, return a reference to ourselves. */
return *this;
}
void
nsMathMLmpaddedFrame::UpdateValue(int32_t aSign,
int32_t aPseudoUnit,
const nsCSSValue& aCSSValue,
const ReflowOutput& aDesiredSize,
nscoord& aValueToUpdate,
float aFontSizeInflation) const
{
nsCSSUnit unit = aCSSValue.GetUnit();
if (NS_MATHML_SIGN_INVALID != aSign && eCSSUnit_Null != unit) {
nscoord scaler = 0, amount = 0;
if (eCSSUnit_Percent == unit || eCSSUnit_Number == unit) {
switch(aPseudoUnit) {
case NS_MATHML_PSEUDO_UNIT_WIDTH:
scaler = aDesiredSize.Width();
break;
case NS_MATHML_PSEUDO_UNIT_HEIGHT:
scaler = aDesiredSize.BlockStartAscent();
break;
case NS_MATHML_PSEUDO_UNIT_DEPTH:
scaler = aDesiredSize.Height() - aDesiredSize.BlockStartAscent();
break;
default:
// if we ever reach here, it would mean something is wrong
// somewhere with the setup and/or the caller
NS_ERROR("Unexpected Pseudo Unit");
return;
}
}
if (eCSSUnit_Number == unit)
amount = NSToCoordRound(float(scaler) * aCSSValue.GetFloatValue());
else if (eCSSUnit_Percent == unit)
amount = NSToCoordRound(float(scaler) * aCSSValue.GetPercentValue());
else
amount = CalcLength(PresContext(), mStyleContext, aCSSValue,
aFontSizeInflation);
if (NS_MATHML_SIGN_PLUS == aSign)
aValueToUpdate += amount;
else if (NS_MATHML_SIGN_MINUS == aSign)
aValueToUpdate -= amount;
else
aValueToUpdate = amount;
}
}
void
nsMathMLmpaddedFrame::UpdateValue(PRInt32 aSign,
PRInt32 aPseudoUnit,
const nsCSSValue& aCSSValue,
const nsBoundingMetrics& aBoundingMetrics,
nscoord& aValueToUpdate) const
{
nsCSSUnit unit = aCSSValue.GetUnit();
if (NS_MATHML_SIGN_INVALID != aSign && eCSSUnit_Null != unit) {
nscoord scaler = 0, amount = 0;
if (eCSSUnit_Percent == unit || eCSSUnit_Number == unit) {
switch(aPseudoUnit) {
case NS_MATHML_PSEUDO_UNIT_WIDTH:
scaler = aBoundingMetrics.width;
break;
case NS_MATHML_PSEUDO_UNIT_HEIGHT:
scaler = aBoundingMetrics.ascent;
break;
case NS_MATHML_PSEUDO_UNIT_DEPTH:
scaler = aBoundingMetrics.descent;
break;
default:
// if we ever reach here, it would mean something is wrong
// somewhere with the setup and/or the caller
NS_ERROR("Unexpected Pseudo Unit");
return;
}
}
if (eCSSUnit_Number == unit)
amount = NSToCoordRound(float(scaler) * aCSSValue.GetFloatValue());
else if (eCSSUnit_Percent == unit)
amount = NSToCoordRound(float(scaler) * aCSSValue.GetPercentValue());
else
amount = CalcLength(PresContext(), mStyleContext, aCSSValue);
nscoord oldValue = aValueToUpdate;
if (NS_MATHML_SIGN_PLUS == aSign)
aValueToUpdate += amount;
else if (NS_MATHML_SIGN_MINUS == aSign)
aValueToUpdate -= amount;
else
aValueToUpdate = amount;
}
}
/* static */ void
nsMathMLFrame::ParseNumericValue(const nsString& aString,
nscoord* aLengthValue,
uint32_t aFlags,
nsPresContext* aPresContext,
nsStyleContext* aStyleContext)
{
nsCSSValue cssValue;
if (!nsMathMLElement::ParseNumericValue(aString, cssValue, aFlags,
aPresContext->Document())) {
// Invalid attribute value. aLengthValue remains unchanged, so the default
// length value is used.
return;
}
nsCSSUnit unit = cssValue.GetUnit();
if (unit == eCSSUnit_Percent || unit == eCSSUnit_Number) {
// Relative units. A multiple of the default length value is used.
*aLengthValue = NSToCoordRound(*aLengthValue * (unit == eCSSUnit_Percent ?
cssValue.GetPercentValue() :
cssValue.GetFloatValue()));
return;
}
// Absolute units.
*aLengthValue = CalcLength(aPresContext, aStyleContext, cssValue);
}
NS_IMETHODIMP
nsRenderingContextQt::GetTextDimensions(const char* aString, PRUint32 aLength,
nsTextDimensions& aDimensions)
{
aDimensions.Clear();
if (aLength == 0)
return NS_OK;
if (nsnull == aString)
return NS_ERROR_FAILURE;
QString str = QString::fromLatin1(aString, aLength);
QFontMetrics fm(mCurrentFont->font);
aDimensions.ascent = NSToCoordRound(fm.ascent()*mP2T);
aDimensions.descent = NSToCoordRound(fm.descent()*mP2T);
aDimensions.width = NSToCoordRound(fm.width(str)*mP2T);
return NS_OK;
}
static nscoord
AppUnitsFromMM(nsIFrame* aFrame, uint32_t aMM, bool aVertical)
{
nsPresContext* pc = aFrame->PresContext();
float result = float(aMM) *
(pc->DeviceContext()->AppUnitsPerPhysicalInch() / MM_PER_INCH_FLOAT);
return NSToCoordRound(result);
}
void
nsMeterFrame::ReflowBarFrame(nsIFrame* aBarFrame,
nsPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
bool vertical = StyleDisplay()->mOrient == NS_STYLE_ORIENT_VERTICAL;
nsHTMLReflowState reflowState(aPresContext, aReflowState, aBarFrame,
nsSize(aReflowState.ComputedWidth(),
NS_UNCONSTRAINEDSIZE));
nscoord size = vertical ? aReflowState.ComputedHeight()
: aReflowState.ComputedWidth();
nscoord xoffset = aReflowState.mComputedBorderPadding.left;
nscoord yoffset = aReflowState.mComputedBorderPadding.top;
// NOTE: Introduce a new function getPosition in the content part ?
double position, max, min, value;
nsCOMPtr<nsIDOMHTMLMeterElement> meterElement =
do_QueryInterface(mContent);
meterElement->GetMax(&max);
meterElement->GetMin(&min);
meterElement->GetValue(&value);
position = max - min;
position = position != 0 ? (value - min) / position : 1;
size = NSToCoordRound(size * position);
if (!vertical && StyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL) {
xoffset += aReflowState.ComputedWidth() - size;
}
// The bar position is *always* constrained.
if (vertical) {
// We want the bar to begin at the bottom.
yoffset += aReflowState.ComputedHeight() - size;
size -= reflowState.mComputedMargin.TopBottom() +
reflowState.mComputedBorderPadding.TopBottom();
size = std::max(size, 0);
reflowState.SetComputedHeight(size);
} else {
size -= reflowState.mComputedMargin.LeftRight() +
reflowState.mComputedBorderPadding.LeftRight();
size = std::max(size, 0);
reflowState.SetComputedWidth(size);
}
xoffset += reflowState.mComputedMargin.left;
yoffset += reflowState.mComputedMargin.top;
nsHTMLReflowMetrics barDesiredSize;
ReflowChild(aBarFrame, aPresContext, barDesiredSize, reflowState, xoffset,
yoffset, 0, aStatus);
FinishReflowChild(aBarFrame, aPresContext, &reflowState, barDesiredSize,
xoffset, yoffset, 0);
}
NS_IMETHODIMP
nsRenderingContextQt::GetBoundingMetrics(const char *aString,PRUint32 aLength,
nsBoundingMetrics &aBoundingMetrics)
{
aBoundingMetrics.Clear();
if (0 >= aLength || !aString || !mCurrentFont)
return(NS_ERROR_FAILURE);
QString str = QString::fromLatin1(aString, aLength);
QFontMetrics fm(mCurrentFont->font);
QRect br = fm.boundingRect(str);
aBoundingMetrics.width = NSToCoordRound(br.width() * mP2T);
aBoundingMetrics.ascent = NSToCoordRound(-br.y() * mP2T);
aBoundingMetrics.descent = NSToCoordRound(br.bottom() * mP2T);
aBoundingMetrics.leftBearing = NSToCoordRound(br.x() * mP2T);
aBoundingMetrics.rightBearing = NSToCoordRound(fm.rightBearing(str.at(aLength - 1)) * mP2T);
return NS_OK;
}
static nscoord
AppUnitsFromMM(nsIFrame* aFrame, uint32_t aMM, bool aVertical)
{
nsPresContext* pc = aFrame->PresContext();
nsIPresShell* presShell = pc->PresShell();
float result = float(aMM) *
(pc->DeviceContext()->AppUnitsPerPhysicalInch() / MM_PER_INCH_FLOAT) *
(aVertical ? presShell->GetYResolution() : presShell->GetXResolution());
return NSToCoordRound(result);
}
static inline nscoord
AllocateUnassigned(nscoord aUnassignedSpace, float aShare)
{
if (aShare == 1.0f) {
// This happens when the numbers we're dividing to get aShare
// are equal. We want to return unassignedSpace exactly, even
// if it can't be precisely round-tripped through float.
return aUnassignedSpace;
}
return NSToCoordRound(float(aUnassignedSpace) * aShare);
}
NS_IMETHODIMP nsRenderingContextPh :: GetWidth(const char* aString, PRUint32 aLength, nscoord& aWidth )
{
PhRect_t extent;
/* Check for the very common case of trying to get the width of a single space */
if( aString[0] == ' ' && aLength == 1 )
return mFontMetrics->GetSpaceWidth(aWidth);
PfExtent( &extent, NULL, mPhotonFontName, 0L, 0L, aString, aLength, PF_SIMPLE_METRICS, NULL );
aWidth = NSToCoordRound((int) ((extent.lr.x - extent.ul.x + 1) * mP2T));
return NS_OK;
}
static nscoord
AppUnitsFromMM(nsIFrame* aFrame, uint32_t aMM)
{
nsPresContext* pc = aFrame->PresContext();
nsIPresShell* presShell = pc->PresShell();
float result = float(aMM) *
(pc->DeviceContext()->AppUnitsPerPhysicalInch() / MM_PER_INCH_FLOAT);
if (presShell->ScaleToResolution()) {
result = result / presShell->GetResolution();
}
return NSToCoordRound(result);
}
NS_IMETHODIMP nsRenderingContextQt::GetWidth(char aC, nscoord &aWidth)
{
if (!mFontMetrics)
return NS_ERROR_FAILURE;
if (aC == ' ') {
aWidth = mCurrentFont->mSpaceWidth;
} else {
QFontMetrics fm(mCurrentFont->font);
aWidth = NSToCoordRound(fm.width(aC) * mP2T);
}
return NS_OK;
}
nscoord
nsMathMLmfracFrame::CalcLineThickness(nsPresContext* aPresContext,
nsStyleContext* aStyleContext,
nsString& aThicknessAttribute,
nscoord onePixel,
nscoord aDefaultRuleThickness)
{
nscoord defaultThickness = aDefaultRuleThickness;
nscoord lineThickness = aDefaultRuleThickness;
nscoord minimumThickness = onePixel;
if (!aThicknessAttribute.IsEmpty()) {
if (aThicknessAttribute.EqualsLiteral("thin")) {
lineThickness = NSToCoordFloor(defaultThickness * THIN_FRACTION_LINE);
minimumThickness = onePixel * THIN_FRACTION_LINE_MINIMUM_PIXELS;
// should visually decrease by at least one pixel, if default is not a pixel
if (defaultThickness > onePixel && lineThickness > defaultThickness - onePixel)
lineThickness = defaultThickness - onePixel;
}
else if (aThicknessAttribute.EqualsLiteral("medium")) {
lineThickness = NSToCoordRound(defaultThickness * MEDIUM_FRACTION_LINE);
minimumThickness = onePixel * MEDIUM_FRACTION_LINE_MINIMUM_PIXELS;
// should visually increase by at least one pixel
if (lineThickness < defaultThickness + onePixel)
lineThickness = defaultThickness + onePixel;
}
else if (aThicknessAttribute.EqualsLiteral("thick")) {
lineThickness = NSToCoordCeil(defaultThickness * THICK_FRACTION_LINE);
minimumThickness = onePixel * THICK_FRACTION_LINE_MINIMUM_PIXELS;
// should visually increase by at least two pixels
if (lineThickness < defaultThickness + 2*onePixel)
lineThickness = defaultThickness + 2*onePixel;
}
else { // see if it is a plain number, or a percentage, or a h/v-unit like 1ex, 2px, 1em
nsCSSValue cssValue;
if (ParseNumericValue(aThicknessAttribute, cssValue)) {
nsCSSUnit unit = cssValue.GetUnit();
if (eCSSUnit_Number == unit)
lineThickness = nscoord(float(defaultThickness) * cssValue.GetFloatValue());
else if (eCSSUnit_Percent == unit)
lineThickness = nscoord(float(defaultThickness) * cssValue.GetPercentValue());
else if (eCSSUnit_Null != unit)
lineThickness = CalcLength(aPresContext, aStyleContext, cssValue);
}
}
}
// use minimum if the lineThickness is a non-zero value less than minimun
if (lineThickness && lineThickness < minimumThickness)
lineThickness = minimumThickness;
return lineThickness;
}
nscoord
nsFontMetrics::GetWidth(const PRUnichar* aString, PRUint32 aLength,
nsRenderingContext *aContext)
{
if (aLength == 0)
return 0;
if (aLength == 1 && aString[0] == ' ')
return SpaceWidth();
StubPropertyProvider provider;
AutoTextRun textRun(this, aContext, aString, aLength);
return NSToCoordRound(textRun->GetAdvanceWidth(0, aLength, &provider));
}
NS_IMETHODIMP nsRenderingContextQt::GetWidth(const char *aString, PRUint32 aLength,nscoord &aWidth)
{
if (0 == aLength) {
aWidth = 0;
return NS_OK;
}
if (nsnull == aString || nsnull == mCurrentFont)
return NS_ERROR_FAILURE;
QFontMetrics curFontMetrics(mCurrentFont->font);
int rawWidth = curFontMetrics.width(QString::fromLatin1(aString, aLength));
aWidth = NSToCoordRound(rawWidth * mP2T);
return NS_OK;
}
NS_IMETHODIMP
nsRenderingContextQt::GetTextDimensions(const PRUnichar *aString,
PRUint32 aLength,
nsTextDimensions &aDimensions,
PRInt32 *aFontID)
{
aDimensions.Clear();
if (0 == aLength)
return NS_OK;
if (nsnull == aString)
return NS_ERROR_FAILURE;
QConstString str((const QChar *)aString, aLength);
QFontMetrics fm(mCurrentFont->font);
aDimensions.ascent = NSToCoordRound(fm.ascent()*mP2T);
aDimensions.descent = NSToCoordRound(fm.descent()*mP2T);
aDimensions.width = NSToCoordRound(fm.width(str.string())*mP2T);
if (nsnull != aFontID)
*aFontID = 0;
return NS_OK;
}
static void
GetTextRunBoundingMetrics(gfxTextRun *aTextRun, PRUint32 aStart, PRUint32 aLength,
nsThebesRenderingContext *aContext,
nsBoundingMetrics &aBoundingMetrics)
{
StubPropertyProvider provider;
gfxTextRun::Metrics theMetrics =
aTextRun->MeasureText(aStart, aLength, PR_TRUE, aContext->ThebesContext(), &provider);
aBoundingMetrics.leftBearing = NSToCoordFloor(theMetrics.mBoundingBox.X());
aBoundingMetrics.rightBearing = NSToCoordCeil(theMetrics.mBoundingBox.XMost());
aBoundingMetrics.width = NSToCoordRound(theMetrics.mAdvanceWidth);
aBoundingMetrics.ascent = NSToCoordCeil(- theMetrics.mBoundingBox.Y());
aBoundingMetrics.descent = NSToCoordCeil(theMetrics.mBoundingBox.YMost());
}
nscoord
nsFontMetrics::GetWidth(const char16_t* aString, uint32_t aLength,
DrawTarget* aDrawTarget)
{
if (aLength == 0)
return 0;
if (aLength == 1 && aString[0] == ' ')
return SpaceWidth();
StubPropertyProvider provider;
AutoTextRun textRun(this, aDrawTarget, aString, aLength);
if (textRun.get()) {
return NSToCoordRound(
textRun->GetAdvanceWidth(Range(0, aLength), &provider));
}
return 0;
}
NS_IMETHODIMP nsRenderingContextQt::GetWidth(const PRUnichar *aString,
PRUint32 aLength,nscoord &aWidth,
PRInt32 *aFontID)
{
if (aFontID)
*aFontID = 0;
if (0 == aLength) {
aWidth = 0;
return NS_OK;
}
if (!aString || !mFontMetrics)
return NS_ERROR_FAILURE;
QConstString cstr((const QChar *)aString, aLength);
QFontMetrics curFontMetrics(mCurrentFont->font);
int rawWidth = curFontMetrics.width(cstr.string());
aWidth = NSToCoordRound(rawWidth * mP2T);
return NS_OK;
}
nsSize
nsProgressFrame::ComputeAutoSize(nsRenderingContext *aRenderingContext,
nsSize aCBSize, nscoord aAvailableWidth,
nsSize aMargin, nsSize aBorder,
nsSize aPadding, bool aShrinkWrap)
{
nsSize autoSize;
autoSize.height = autoSize.width =
NSToCoordRound(StyleFont()->mFont.size *
nsLayoutUtils::FontSizeInflationFor(this)); // 1em
if (StyleDisplay()->mOrient == NS_STYLE_ORIENT_VERTICAL) {
autoSize.height *= 10; // 10em
} else {
autoSize.width *= 10; // 10em
}
return autoSize;
}
nsBoundingMetrics
nsFontMetrics::GetBoundingMetrics(const PRUnichar *aString, PRUint32 aLength,
nsRenderingContext *aContext)
{
if (aLength == 0)
return nsBoundingMetrics();
StubPropertyProvider provider;
AutoTextRun textRun(this, aContext, aString, aLength);
gfxTextRun::Metrics theMetrics =
textRun->MeasureText(0, aLength,
gfxFont::TIGHT_HINTED_OUTLINE_EXTENTS,
aContext->ThebesContext(), &provider);
nsBoundingMetrics m;
m.leftBearing = NSToCoordFloor( theMetrics.mBoundingBox.X());
m.rightBearing = NSToCoordCeil( theMetrics.mBoundingBox.XMost());
m.ascent = NSToCoordCeil( -theMetrics.mBoundingBox.Y());
m.descent = NSToCoordCeil( theMetrics.mBoundingBox.YMost());
m.width = NSToCoordRound( theMetrics.mAdvanceWidth);
return m;
}
nsresult
nsThebesFontMetrics::GetWidth(const char* aString, PRUint32 aLength, nscoord& aWidth,
nsThebesRenderingContext *aContext)
{
if (aLength == 0) {
aWidth = 0;
return NS_OK;
}
// callers that hit this should not be so stupid
if ((aLength == 1) && (aString[0] == ' '))
return GetSpaceWidth(aWidth);
StubPropertyProvider provider;
AutoTextRun textRun(this, aContext, aString, aLength);
if (!textRun.get())
return NS_ERROR_FAILURE;
aWidth = NSToCoordRound(textRun->GetAdvanceWidth(0, aLength, &provider));
return NS_OK;
}
static nsBoundingMetrics
GetTextBoundingMetrics(nsFontMetrics* aMetrics, const char16_t* aString,
uint32_t aLength, mozilla::gfx::DrawTarget* aDrawTarget,
gfxFont::BoundingBoxType aType)
{
if (aLength == 0)
return nsBoundingMetrics();
StubPropertyProvider provider;
AutoTextRun textRun(aMetrics, aDrawTarget, aString, aLength);
nsBoundingMetrics m;
if (textRun.get()) {
gfxTextRun::Metrics theMetrics = textRun->MeasureText(
gfxTextRun::Range(0, aLength), aType, aDrawTarget, &provider);
m.leftBearing = NSToCoordFloor( theMetrics.mBoundingBox.X());
m.rightBearing = NSToCoordCeil( theMetrics.mBoundingBox.XMost());
m.ascent = NSToCoordCeil( -theMetrics.mBoundingBox.Y());
m.descent = NSToCoordCeil( theMetrics.mBoundingBox.YMost());
m.width = NSToCoordRound( theMetrics.mAdvanceWidth);
}
return m;
}
static void
GetRadicalXOffsets(nscoord aIndexWidth, nscoord aSqrWidth,
nsIFontMetrics* aFontMetrics,
nscoord* aIndexOffset, nscoord* aSqrOffset)
{
// The index is tucked in closer to the radical while making sure
// that the kern does not make the index and radical collide
nscoord dxIndex, dxSqr;
nscoord xHeight = 0;
aFontMetrics->GetXHeight(xHeight);
nscoord indexRadicalKern = NSToCoordRound(1.35f * xHeight);
if (indexRadicalKern > aIndexWidth) {
dxIndex = indexRadicalKern - aIndexWidth;
dxSqr = 0;
}
else {
dxIndex = 0;
dxSqr = aIndexWidth - indexRadicalKern;
}
// avoid collision by leaving a minimum space between index and radical
nscoord minimumClearance = aSqrWidth/2;
if (dxIndex + aIndexWidth + minimumClearance > dxSqr + aSqrWidth) {
if (aIndexWidth + minimumClearance < aSqrWidth) {
dxIndex = aSqrWidth - (aIndexWidth + minimumClearance);
dxSqr = 0;
}
else {
dxIndex = 0;
dxSqr = (aIndexWidth + minimumClearance) - aSqrWidth;
}
}
if (aIndexOffset)
*aIndexOffset = dxIndex;
if (aSqrOffset)
*aSqrOffset = dxSqr;
}
static nsBoundingMetrics
GetTextBoundingMetrics(nsFontMetrics* aMetrics, const PRUnichar *aString, uint32_t aLength,
nsRenderingContext *aContext, gfxFont::BoundingBoxType aType)
{
if (aLength == 0)
return nsBoundingMetrics();
StubPropertyProvider provider;
AutoTextRun textRun(aMetrics, aContext, aString, aLength);
nsBoundingMetrics m;
if (textRun.get()) {
gfxTextRun::Metrics theMetrics =
textRun->MeasureText(0, aLength,
aType,
aContext->ThebesContext(), &provider);
m.leftBearing = NSToCoordFloor( theMetrics.mBoundingBox.X());
m.rightBearing = NSToCoordCeil( theMetrics.mBoundingBox.XMost());
m.ascent = NSToCoordCeil( -theMetrics.mBoundingBox.Y());
m.descent = NSToCoordCeil( theMetrics.mBoundingBox.YMost());
m.width = NSToCoordRound( theMetrics.mAdvanceWidth);
}
return m;
}
NS_IMETHODIMP
nsMathMLmfencedFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
nsresult rv;
aDesiredSize.width = aDesiredSize.height = 0;
aDesiredSize.ascent = 0;
aDesiredSize.mBoundingMetrics = nsBoundingMetrics();
PRInt32 i;
const nsStyleFont* font = GetStyleFont();
nsRefPtr<nsFontMetrics> fm;
nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));
aReflowState.rendContext->SetFont(fm);
nscoord axisHeight, em;
GetAxisHeight(*aReflowState.rendContext, fm, axisHeight);
GetEmHeight(fm, em);
// leading to be left at the top and the bottom of stretched chars
nscoord leading = NSToCoordRound(0.2f * em);
/////////////
// Reflow children
// Asking each child to cache its bounding metrics
// Note that we don't use the base method nsMathMLContainerFrame::Reflow()
// because we want to stretch our fences, separators and stretchy frames using
// the *same* initial aDesiredSize.mBoundingMetrics. If we were to use the base
// method here, our stretchy frames will be stretched and placed, and we may
// end up stretching our fences/separators with a different aDesiredSize.
// XXX The above decision was revisited in bug 121748 and this code can be
// refactored to use nsMathMLContainerFrame::Reflow() at some stage.
nsReflowStatus childStatus;
nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
nsIFrame* firstChild = GetFirstChild(nsnull);
nsIFrame* childFrame = firstChild;
nscoord ascent = 0, descent = 0;
if (firstChild || mOpenChar || mCloseChar || mSeparatorsCount > 0) {
// We use the ASCII metrics to get our minimum height. This way,
// if we have borders or a background, they will fit better with
// other elements on the line.
ascent = fm->MaxAscent();
descent = fm->MaxDescent();
}
while (childFrame) {
nsHTMLReflowMetrics childDesiredSize(aDesiredSize.mFlags
| NS_REFLOW_CALC_BOUNDING_METRICS);
nsHTMLReflowState childReflowState(aPresContext, aReflowState,
childFrame, availSize);
rv = ReflowChild(childFrame, aPresContext, childDesiredSize,
childReflowState, childStatus);
//NS_ASSERTION(NS_FRAME_IS_COMPLETE(childStatus), "bad status");
if (NS_FAILED(rv)) {
// Call DidReflow() for the child frames we successfully did reflow.
DidReflowChildren(firstChild, childFrame);
return rv;
}
SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
childDesiredSize.mBoundingMetrics);
nscoord childDescent = childDesiredSize.height - childDesiredSize.ascent;
if (descent < childDescent)
descent = childDescent;
if (ascent < childDesiredSize.ascent)
ascent = childDesiredSize.ascent;
childFrame = childFrame->GetNextSibling();
}
/////////////
// Ask stretchy children to stretch themselves
nsBoundingMetrics containerSize;
nsStretchDirection stretchDir = NS_STRETCH_DIRECTION_VERTICAL;
GetPreferredStretchSize(*aReflowState.rendContext,
0, /* i.e., without embellishments */
stretchDir, containerSize);
childFrame = firstChild;
while (childFrame) {
nsIMathMLFrame* mathmlChild = do_QueryFrame(childFrame);
if (mathmlChild) {
nsHTMLReflowMetrics childDesiredSize;
// retrieve the metrics that was stored at the previous pass
GetReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
childDesiredSize.mBoundingMetrics);
mathmlChild->Stretch(*aReflowState.rendContext,
stretchDir, containerSize, childDesiredSize);
// store the updated metrics
SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
childDesiredSize.mBoundingMetrics);
nscoord childDescent = childDesiredSize.height - childDesiredSize.ascent;
if (descent < childDescent)
descent = childDescent;
if (ascent < childDesiredSize.ascent)
ascent = childDesiredSize.ascent;
}
childFrame = childFrame->GetNextSibling();
}
// bug 121748: for surrounding fences & separators, use a size that covers everything
GetPreferredStretchSize(*aReflowState.rendContext,
STRETCH_CONSIDER_EMBELLISHMENTS,
stretchDir, containerSize);
//////////////////////////////////////////
// Prepare the opening fence, separators, and closing fence, and
// adjust the origin of children.
// we need to center around the axis
nscoord delta = NS_MAX(containerSize.ascent - axisHeight,
containerSize.descent + axisHeight);
containerSize.ascent = delta + axisHeight;
containerSize.descent = delta - axisHeight;
/////////////////
// opening fence ...
ReflowChar(aPresContext, *aReflowState.rendContext, mOpenChar,
NS_MATHML_OPERATOR_FORM_PREFIX, font->mScriptLevel,
axisHeight, leading, em, containerSize, ascent, descent);
/////////////////
// separators ...
for (i = 0; i < mSeparatorsCount; i++) {
ReflowChar(aPresContext, *aReflowState.rendContext, &mSeparatorsChar[i],
NS_MATHML_OPERATOR_FORM_INFIX, font->mScriptLevel,
axisHeight, leading, em, containerSize, ascent, descent);
}
/////////////////
// closing fence ...
ReflowChar(aPresContext, *aReflowState.rendContext, mCloseChar,
NS_MATHML_OPERATOR_FORM_POSTFIX, font->mScriptLevel,
axisHeight, leading, em, containerSize, ascent, descent);
//////////////////
// Adjust the origins of each child.
// and update our bounding metrics
i = 0;
nscoord dx = 0;
nsBoundingMetrics bm;
PRBool firstTime = PR_TRUE;
if (mOpenChar) {
PlaceChar(mOpenChar, ascent, bm, dx);
aDesiredSize.mBoundingMetrics = bm;
firstTime = PR_FALSE;
}
childFrame = firstChild;
while (childFrame) {
nsHTMLReflowMetrics childSize;
GetReflowAndBoundingMetricsFor(childFrame, childSize, bm);
if (firstTime) {
firstTime = PR_FALSE;
aDesiredSize.mBoundingMetrics = bm;
}
else
aDesiredSize.mBoundingMetrics += bm;
FinishReflowChild(childFrame, aPresContext, nsnull, childSize,
dx, ascent - childSize.ascent, 0);
dx += childSize.width;
if (i < mSeparatorsCount) {
PlaceChar(&mSeparatorsChar[i], ascent, bm, dx);
aDesiredSize.mBoundingMetrics += bm;
}
i++;
childFrame = childFrame->GetNextSibling();
}
if (mCloseChar) {
PlaceChar(mCloseChar, ascent, bm, dx);
if (firstTime)
aDesiredSize.mBoundingMetrics = bm;
else
aDesiredSize.mBoundingMetrics += bm;
}
aDesiredSize.width = aDesiredSize.mBoundingMetrics.width;
aDesiredSize.height = ascent + descent;
aDesiredSize.ascent = ascent;
SetBoundingMetrics(aDesiredSize.mBoundingMetrics);
SetReference(nsPoint(0, aDesiredSize.ascent));
// see if we should fix the spacing
FixInterFrameSpacing(aDesiredSize);
// Finished with these:
ClearSavedChildMetrics();
// Set our overflow area
GatherAndStoreOverflow(&aDesiredSize);
aStatus = NS_FRAME_COMPLETE;
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
return NS_OK;
}