static inline float dimensionForLengthMode(SVGLengthMode mode, const FloatSize& viewportSize)
{
switch (mode) {
case SVGLengthMode::Width:
return viewportSize.width();
case SVGLengthMode::Height:
return viewportSize.height();
case SVGLengthMode::Other:
return sqrtf(viewportSize.diagonalLengthSquared() / 2);
}
ASSERT_NOT_REACHED();
return 0;
}
ExceptionOr<float> SVGLengthContext::convertValueFromPercentageToUserUnits(float value, SVGLengthMode mode) const
{
FloatSize viewportSize;
if (!determineViewport(viewportSize))
return Exception { NOT_SUPPORTED_ERR };
switch (mode) {
case LengthModeWidth:
return value * viewportSize.width();
case LengthModeHeight:
return value * viewportSize.height();
case LengthModeOther:
return value * std::sqrt(viewportSize.diagonalLengthSquared() / 2);
};
ASSERT_NOT_REACHED();
return 0;
}
float SVGLengthContext::valueForLength(const Length& length, SVGLengthMode mode)
{
if (length.isPercent())
return convertValueFromPercentageToUserUnits(length.value() / 100, mode, IGNORE_EXCEPTION);
if (length.isAuto() || !length.isSpecified())
return 0;
FloatSize viewportSize;
determineViewport(viewportSize);
switch (mode) {
case LengthModeWidth:
return floatValueForLength(length, viewportSize.width());
case LengthModeHeight:
return floatValueForLength(length, viewportSize.height());
case LengthModeOther:
return floatValueForLength(length, sqrtf(viewportSize.diagonalLengthSquared() / 2));
};
return 0;
}
float SVGLengthContext::convertValueFromUserUnitsToPercentage(float value, SVGLengthMode mode, ExceptionCode& ec) const
{
FloatSize viewportSize;
if (!determineViewport(viewportSize)) {
ec = NOT_SUPPORTED_ERR;
return 0;
}
switch (mode) {
case LengthModeWidth:
return value / viewportSize.width() * 100;
case LengthModeHeight:
return value / viewportSize.height() * 100;
case LengthModeOther:
return value / (sqrtf(viewportSize.diagonalLengthSquared() / 2)) * 100;
};
ASSERT_NOT_REACHED();
return 0;
}
float SVGLengthContext::convertValueFromPercentageToUserUnits(float value, SVGLengthMode mode, ExceptionState& exceptionState) const
{
FloatSize viewportSize;
if (!determineViewport(viewportSize)) {
exceptionState.throwDOMException(NotSupportedError, "The viewport could not be determined.");
return 0;
}
switch (mode) {
case LengthModeWidth:
return value * viewportSize.width();
case LengthModeHeight:
return value * viewportSize.height();
case LengthModeOther:
return value * sqrtf(viewportSize.diagonalLengthSquared() / 2);
};
ASSERT_NOT_REACHED();
return 0;
}
float SVGLengthContext::valueForLength(const Length& length, SVGLengthMode mode)
{
if (length.isPercent()) {
auto result = convertValueFromPercentageToUserUnits(length.value() / 100, mode);
if (result.hasException())
return 0;
return result.releaseReturnValue();
}
if (length.isAuto() || !length.isSpecified())
return 0;
FloatSize viewportSize;
determineViewport(viewportSize);
switch (mode) {
case LengthModeWidth:
return floatValueForLength(length, viewportSize.width());
case LengthModeHeight:
return floatValueForLength(length, viewportSize.height());
case LengthModeOther:
return floatValueForLength(length, std::sqrt(viewportSize.diagonalLengthSquared() / 2));
};
return 0;
}
