static inline float dimensionForViewportUnit(const SVGElement* context, CSSPrimitiveValue::UnitType unit)
{
if (!context)
return 0;
const Document& document = context->document();
FrameView* view = document.view();
if (!view)
return 0;
const ComputedStyle* style = computedStyleForLengthResolving(context);
if (!style)
return 0;
FloatSize viewportSize(view->width(), view->height());
switch (unit) {
case CSSPrimitiveValue::UnitType::ViewportWidth:
return viewportLengthPercent(viewportSize.width()) / style->effectiveZoom();
case CSSPrimitiveValue::UnitType::ViewportHeight:
return viewportLengthPercent(viewportSize.height()) / style->effectiveZoom();
case CSSPrimitiveValue::UnitType::ViewportMin:
return viewportMinPercent(viewportSize) / style->effectiveZoom();
case CSSPrimitiveValue::UnitType::ViewportMax:
return viewportMaxPercent(viewportSize) / style->effectiveZoom();
default:
break;
}
ASSERT_NOT_REACHED();
return 0;
}
float SVGLengthContext::convertValueToUserUnits(float value, SVGLengthMode mode, CSSPrimitiveValue::UnitType fromUnit) const
{
float userUnits = value;
switch (fromUnit) {
case CSSPrimitiveValue::UnitType::Pixels:
case CSSPrimitiveValue::UnitType::Number:
case CSSPrimitiveValue::UnitType::UserUnits:
userUnits = value;
break;
case CSSPrimitiveValue::UnitType::Percentage: {
FloatSize viewportSize;
if (!determineViewport(viewportSize))
return 0;
userUnits = value * dimensionForLengthMode(mode, viewportSize) / 100;
break;
}
case CSSPrimitiveValue::UnitType::Ems:
userUnits = convertValueFromEMSToUserUnits(computedStyleForLengthResolving(m_context), value);
break;
case CSSPrimitiveValue::UnitType::Exs:
userUnits = convertValueFromEXSToUserUnits(value);
break;
case CSSPrimitiveValue::UnitType::Centimeters:
userUnits = value * cssPixelsPerCentimeter;
break;
case CSSPrimitiveValue::UnitType::Millimeters:
userUnits = value * cssPixelsPerMillimeter;
break;
case CSSPrimitiveValue::UnitType::Inches:
userUnits = value * cssPixelsPerInch;
break;
case CSSPrimitiveValue::UnitType::Points:
userUnits = value * cssPixelsPerPoint;
break;
case CSSPrimitiveValue::UnitType::Picas:
userUnits = value * cssPixelsPerPica;
break;
case CSSPrimitiveValue::UnitType::Rems:
userUnits = convertValueFromEMSToUserUnits(rootElementStyle(m_context), value);
break;
case CSSPrimitiveValue::UnitType::Chs:
userUnits = convertValueFromCHSToUserUnits(value);
break;
case CSSPrimitiveValue::UnitType::ViewportWidth:
case CSSPrimitiveValue::UnitType::ViewportHeight:
case CSSPrimitiveValue::UnitType::ViewportMin:
case CSSPrimitiveValue::UnitType::ViewportMax:
userUnits = value * dimensionForViewportUnit(m_context, fromUnit);
break;
default:
ASSERT_NOT_REACHED();
break;
}
// Since we mix css <length> values with svg's length values we need to
// clamp values to the narrowest range, otherwise it can result in
// rendering issues.
return CSSPrimitiveValue::clampToCSSLengthRange(userUnits);
}
float SVGLengthContext::convertValueFromCHSToUserUnits(float value) const
{
const ComputedStyle* style = computedStyleForLengthResolving(m_context);
if (!style)
return 0;
return value * style->fontMetrics().zeroWidth() / style->effectiveZoom();
}
float SVGLengthContext::convertValueFromEXSToUserUnits(float value) const
{
const ComputedStyle* style = computedStyleForLengthResolving(m_context);
if (!style)
return 0;
// Use of ceil allows a pixel match to the W3Cs expected output of coords-units-03-b.svg
// if this causes problems in real world cases maybe it would be best to remove this
return value * ceilf(style->fontMetrics().xHeight() / style->effectiveZoom());
}
float SVGLengthContext::convertValueToUserUnits(float value, SVGLengthMode mode, SVGLengthType fromUnit) const
{
float userUnits = value;
switch (fromUnit) {
case LengthTypeUnknown:
return 0;
case LengthTypePX:
case LengthTypeNumber:
userUnits = value;
break;
case LengthTypePercentage: {
FloatSize viewportSize;
if (!determineViewport(viewportSize))
return 0;
userUnits = value * dimensionForLengthMode(mode, viewportSize) / 100;
break;
}
case LengthTypeEMS:
userUnits = convertValueFromEMSToUserUnits(computedStyleForLengthResolving(m_context), value);
break;
case LengthTypeEXS:
userUnits = convertValueFromEXSToUserUnits(value);
break;
case LengthTypeCM:
userUnits = value * cssPixelsPerCentimeter;
break;
case LengthTypeMM:
userUnits = value * cssPixelsPerMillimeter;
break;
case LengthTypeIN:
userUnits = value * cssPixelsPerInch;
break;
case LengthTypePT:
userUnits = value * cssPixelsPerPoint;
break;
case LengthTypePC:
userUnits = value * cssPixelsPerPica;
break;
case LengthTypeREMS:
userUnits = convertValueFromEMSToUserUnits(rootElementStyle(m_context), value);
break;
case LengthTypeCHS:
userUnits = convertValueFromCHSToUserUnits(value);
break;
default:
ASSERT_NOT_REACHED();
break;
}
// Since we mix css <length> values with svg's length values we need to
// clamp values to the narrowest range, otherwise it can result in
// rendering issues.
return CSSPrimitiveValue::clampToCSSLengthRange(userUnits);
}
float SVGLengthContext::convertValueFromUserUnitsToCHS(float value) const
{
const ComputedStyle* style = computedStyleForLengthResolving(m_context);
if (!style)
return 0;
float zeroWidth = style->fontMetrics().zeroWidth();
if (!zeroWidth)
return 0;
return value / zeroWidth;
}
float SVGLengthContext::convertValueFromUserUnits(
float value,
SVGLengthMode mode,
CSSPrimitiveValue::UnitType toUnit) const {
switch (toUnit) {
case CSSPrimitiveValue::UnitType::Pixels:
case CSSPrimitiveValue::UnitType::Number:
case CSSPrimitiveValue::UnitType::Integer:
case CSSPrimitiveValue::UnitType::UserUnits:
return value;
case CSSPrimitiveValue::UnitType::Percentage: {
FloatSize viewportSize;
if (!determineViewport(viewportSize))
return 0;
float dimension = dimensionForLengthMode(mode, viewportSize);
if (!dimension)
return 0;
// LengthTypePercentage is represented with 100% = 100.0.
// Good for accuracy but could eventually be changed.
return value * 100 / dimension;
}
case CSSPrimitiveValue::UnitType::Ems:
return convertValueFromUserUnitsToEMS(
computedStyleForLengthResolving(m_context), value);
case CSSPrimitiveValue::UnitType::Exs:
return convertValueFromUserUnitsToEXS(value);
case CSSPrimitiveValue::UnitType::Rems:
return convertValueFromUserUnitsToEMS(rootElementStyle(m_context), value);
case CSSPrimitiveValue::UnitType::Chs:
return convertValueFromUserUnitsToCHS(value);
case CSSPrimitiveValue::UnitType::Centimeters:
return value / cssPixelsPerCentimeter;
case CSSPrimitiveValue::UnitType::Millimeters:
return value / cssPixelsPerMillimeter;
case CSSPrimitiveValue::UnitType::Inches:
return value / cssPixelsPerInch;
case CSSPrimitiveValue::UnitType::Points:
return value / cssPixelsPerPoint;
case CSSPrimitiveValue::UnitType::Picas:
return value / cssPixelsPerPica;
case CSSPrimitiveValue::UnitType::ViewportWidth:
case CSSPrimitiveValue::UnitType::ViewportHeight:
case CSSPrimitiveValue::UnitType::ViewportMin:
case CSSPrimitiveValue::UnitType::ViewportMax:
return value / dimensionForViewportUnit(m_context, toUnit);
default:
break;
}
ASSERT_NOT_REACHED();
return 0;
}
float SVGLengthContext::convertValueFromUserUnitsToCHS(float value) const {
const ComputedStyle* style = computedStyleForLengthResolving(m_context);
const SimpleFontData* fontData = style->font().primaryFont();
if (!style || !fontData)
return 0;
float zeroWidth =
fontData->getFontMetrics().zeroWidth() / style->effectiveZoom();
if (!zeroWidth)
return 0;
return value / zeroWidth;
}
float SVGLengthContext::resolveValue(const CSSPrimitiveValue& primitiveValue,
SVGLengthMode mode) const {
const ComputedStyle* style = computedStyleForLengthResolving(m_context);
if (!style)
return 0;
const ComputedStyle* rootStyle = rootElementStyle(m_context);
if (!rootStyle)
return 0;
CSSToLengthConversionData conversionData = CSSToLengthConversionData(
style, rootStyle, m_context->document().layoutViewItem(), 1.0f);
Length length = primitiveValue.convertToLength(conversionData);
return valueForLength(length, 1.0f, mode);
}
float SVGLengthContext::convertValueFromUserUnitsToEXS(float value) const {
const ComputedStyle* style = computedStyleForLengthResolving(m_context);
const SimpleFontData* fontData = style->font().primaryFont();
if (!style || !fontData)
return 0;
// Use of ceil allows a pixel match to the W3Cs expected output of
// coords-units-03-b.svg, if this causes problems in real world cases maybe it
// would be best to remove this.
float xHeight =
ceilf(fontData->getFontMetrics().xHeight() / style->effectiveZoom());
if (!xHeight)
return 0;
return value / xHeight;
}
float SVGLengthContext::convertValueFromUserUnits(float value, SVGLengthMode mode, SVGLengthType toUnit) const
{
switch (toUnit) {
case LengthTypeUnknown:
return 0;
case LengthTypeNumber:
return value;
case LengthTypePercentage: {
FloatSize viewportSize;
if (!determineViewport(viewportSize))
return 0;
float dimension = dimensionForLengthMode(mode, viewportSize);
if (!dimension)
return 0;
// LengthTypePercentage is represented with 100% = 100.0.
// Good for accuracy but could eventually be changed.
return value * 100 / dimension;
}
case LengthTypeEMS:
return convertValueFromUserUnitsToEMS(computedStyleForLengthResolving(m_context), value);
case LengthTypeEXS:
return convertValueFromUserUnitsToEXS(value);
case LengthTypeREMS:
return convertValueFromUserUnitsToEMS(rootElementStyle(m_context), value);
case LengthTypeCHS:
return convertValueFromUserUnitsToCHS(value);
case LengthTypePX:
return value;
case LengthTypeCM:
return value / cssPixelsPerCentimeter;
case LengthTypeMM:
return value / cssPixelsPerMillimeter;
case LengthTypeIN:
return value / cssPixelsPerInch;
case LengthTypePT:
return value / cssPixelsPerPoint;
case LengthTypePC:
return value / cssPixelsPerPica;
}
ASSERT_NOT_REACHED();
return 0;
}
