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/*
* Copyright 2005 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.layoutmgr.inline;
import org.apache.fop.datatypes.Length;
/**
* The FOP specific incarnation of the XSL-FO scaled baseline table.
* All baseline tables are scaled to the font size of the font they
* apply to. This interface uses a coordinate system with its origin
* where the dominant baseline intersects the start edge of the box.
* All measurements are in mpt.
*/
public interface ScaledBaselineTable {
/**
* Return the dominant baseline identifer for this alignment context.
* @return the dominant baseline identifier
*/
int getDominantBaselineIdentifier();
/**
* Return the writing mode for this aligment context.
* @return the writing mode
*/
int getWritingMode();
/**
* Return the offset measured from the dominant
* baseline for the given baseline identifier.
* @param baselineIdentifier the baseline identifier
* @return the baseline offset
*/
int getBaseline(int baselineIdentifier);
/**
* Sets the position of the before and after baselines.
* This is usually only done for line areas. For other
* areas the position of the before and after baselines
* are fixed when the table is constructed.
* @param beforeBaseline the offset of the before-edge baseline from the dominant baseline
* @param afterBaseline the offset of the after-edge baseline from the dominant baseline
*/
void setBeforeAndAfterBaselines(int beforeBaseline, int afterBaseline);
/**
* Return a new baseline table for the given baseline based
* on the current baseline table.
* @param baselineIdentifier the baseline identifer
* @return a new baseline with the new baseline
*/
ScaledBaselineTable deriveScaledBaselineTable(int baselineIdentifier);
}
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