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/*
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* Copyright (c) 1998, 2003, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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*
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* (C) Copyright IBM Corp. 1998-2003 All Rights Reserved
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*/
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package sun.font;
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import java.awt.Font;
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import java.awt.font.FontRenderContext;
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import java.awt.font.LineMetrics;
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import java.text.Bidi;
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/**
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* A factory for text labels. Basically this just holds onto the stuff that
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* doesn't change-- the render context, context, and bidi info for the context-- and gets
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* called for each subrange you want to create.
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*
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* @see Font
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* @see FontRenderContext
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* @see GlyphVector
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* @see TextLabel
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* @see ExtendedTextLabel
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* @see Bidi
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* @see TextLayout
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*/
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public class TextLabelFactory {
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private FontRenderContext frc;
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private char[] text;
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private Bidi bidi;
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private Bidi lineBidi;
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private int flags;
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private int lineStart;
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private int lineLimit;
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/**
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* Initialize a factory to produce glyph arrays.
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* @param frc the FontRenderContext to use for the arrays to be produced.
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* @param text the text of the paragraph.
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* @param bidi the bidi information for the paragraph text, or null if the
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* entire text is left-to-right text.
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*/
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public TextLabelFactory(FontRenderContext frc,
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char[] text,
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Bidi bidi,
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int flags) {
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this.frc = frc;
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this.text = text;
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this.bidi = bidi;
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this.flags = flags;
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this.lineBidi = bidi;
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this.lineStart = 0;
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this.lineLimit = text.length;
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}
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public FontRenderContext getFontRenderContext() {
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return frc;
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}
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public char[] getText() {
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return text;
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}
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public Bidi getParagraphBidi() {
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return bidi;
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}
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public Bidi getLineBidi() {
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return lineBidi;
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}
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public int getLayoutFlags() {
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return flags;
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}
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public int getLineStart() {
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return lineStart;
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}
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public int getLineLimit() {
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return lineLimit;
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}
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/**
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* Set a line context for the factory. Shaping only occurs on this line.
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* Characters are ordered as they would appear on this line.
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* @param lineStart the index within the text of the start of the line.
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* @param lineLimit the index within the text of the limit of the line.
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*/
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public void setLineContext(int lineStart, int lineLimit) {
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this.lineStart = lineStart;
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this.lineLimit = lineLimit;
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if (bidi != null) {
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lineBidi = bidi.createLineBidi(lineStart, lineLimit);
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}
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}
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/**
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* Create an extended glyph array for the text between start and limit.
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*
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* @param font the font to use to generate glyphs and character positions.
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* @param start the start of the subrange for which to create the glyph array
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* @param limit the limit of the subrange for which to create glyph array
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*
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* Start and limit must be within the bounds of the current line. If no
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* line context has been set, the entire text is used as the current line.
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* The text between start and limit will be treated as though it all has
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* the same bidi level (and thus the same directionality) as the character
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* at start. Clients should ensure that all text between start and limit
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* has the same bidi level for the current line.
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*/
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public ExtendedTextLabel createExtended(Font font,
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CoreMetrics lm,
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Decoration decorator,
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int start,
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int limit) {
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if (start >= limit || start < lineStart || limit > lineLimit) {
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throw new IllegalArgumentException("bad start: " + start + " or limit: " + limit);
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}
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int level = lineBidi == null ? 0 : lineBidi.getLevelAt(start - lineStart);
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int linedir = (lineBidi == null || lineBidi.baseIsLeftToRight()) ? 0 : 1;
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int layoutFlags = flags & ~0x9; // remove bidi, line direction flags
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if ((level & 0x1) != 0) layoutFlags |= 1; // rtl
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if ((linedir & 0x1) != 0) layoutFlags |= 8; // line rtl
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TextSource source = new StandardTextSource(text, start, limit - start, lineStart, lineLimit - lineStart, level, layoutFlags, font, frc, lm);
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return new ExtendedTextSourceLabel(source, decorator);
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}
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/**
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* Create a simple glyph array for the text between start and limit.
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*
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* @param font the font to use to generate glyphs and character positions.
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* @param start the start of the subrange for which to create the glyph array
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* @param limit the limit of the subrange for which to create glyph array
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*/
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public TextLabel createSimple(Font font,
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CoreMetrics lm,
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int start,
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int limit) {
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if (start >= limit || start < lineStart || limit > lineLimit) {
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throw new IllegalArgumentException("bad start: " + start + " or limit: " + limit);
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}
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int level = lineBidi == null ? 0 : lineBidi.getLevelAt(start - lineStart);
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int linedir = (lineBidi == null || lineBidi.baseIsLeftToRight()) ? 0 : 1;
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int layoutFlags = flags & ~0x9; // remove bidi, line direction flags
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if ((level & 0x1) != 0) layoutFlags |= 1; // rtl
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if ((linedir & 0x1) != 0) layoutFlags |= 8; // line rtl
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TextSource source = new StandardTextSource(text, start, limit - start, lineStart, lineLimit - lineStart, level, layoutFlags, font, frc, lm);
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return new TextSourceLabel(source);
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}
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}
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