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/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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.
*/
package android.text;
import com.android.internal.util.ArrayUtils;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.text.style.MetricAffectingSpan;
import android.text.style.ReplacementSpan;
import android.util.Log;
/**
* @hide
*/
class MeasuredText {
/* package */ CharSequence mText;
/* package */ int mTextStart;
/* package */ float[] mWidths;
/* package */ char[] mChars;
/* package */ byte[] mLevels;
/* package */ int mDir;
/* package */ boolean mEasy;
/* package */ int mLen;
private int mPos;
private TextPaint mWorkPaint;
private MeasuredText() {
mWorkPaint = new TextPaint();
}
private static MeasuredText[] cached = new MeasuredText[3];
/* package */
static MeasuredText obtain() {
MeasuredText mt;
synchronized (cached) {
for (int i = cached.length; --i >= 0;) {
if (cached[i] != null) {
mt = cached[i];
cached[i] = null;
return mt;
}
}
}
mt = new MeasuredText();
Log.e("MEAS", "new: " + mt);
return mt;
}
/* package */
static MeasuredText recycle(MeasuredText mt) {
mt.mText = null;
if (mt.mLen < 1000) {
synchronized(cached) {
for (int i = 0; i < cached.length; ++i) {
if (cached[i] == null) {
cached[i] = mt;
break;
}
}
}
}
return null;
}
/**
* Analyzes text for bidirectional runs. Allocates working buffers.
*/
/* package */
void setPara(CharSequence text, int start, int end, int bidiRequest) {
mText = text;
mTextStart = start;
int len = end - start;
mLen = len;
mPos = 0;
if (mWidths == null || mWidths.length < len) {
mWidths = new float[ArrayUtils.idealFloatArraySize(len)];
}
if (mChars == null || mChars.length < len) {
mChars = new char[ArrayUtils.idealCharArraySize(len)];
}
TextUtils.getChars(text, start, end, mChars, 0);
if (text instanceof Spanned) {
Spanned spanned = (Spanned) text;
ReplacementSpan[] spans = spanned.getSpans(start, end,
ReplacementSpan.class);
for (int i = 0; i < spans.length; i++) {
int startInPara = spanned.getSpanStart(spans[i]) - start;
int endInPara = spanned.getSpanEnd(spans[i]) - start;
for (int j = startInPara; j < endInPara; j++) {
mChars[j] = '\uFFFC';
}
}
}
if (TextUtils.doesNotNeedBidi(mChars, 0, len)) {
mDir = Layout.DIR_LEFT_TO_RIGHT;
mEasy = true;
} else {
if (mLevels == null || mLevels.length < len) {
mLevels = new byte[ArrayUtils.idealByteArraySize(len)];
}
mDir = AndroidBidi.bidi(bidiRequest, mChars, mLevels, len, false);
mEasy = false;
}
}
float addStyleRun(TextPaint paint, int len, Paint.FontMetricsInt fm) {
if (fm != null) {
paint.getFontMetricsInt(fm);
}
int p = mPos;
mPos = p + len;
if (mEasy) {
int flags = mDir == Layout.DIR_LEFT_TO_RIGHT
? Canvas.DIRECTION_LTR : Canvas.DIRECTION_RTL;
return paint.getTextRunAdvances(mChars, p, len, p, len, flags, mWidths, p);
}
float totalAdvance = 0;
int level = mLevels[p];
for (int q = p, i = p + 1, e = p + len;; ++i) {
if (i == e || mLevels[i] != level) {
int flags = (level & 0x1) == 0 ? Canvas.DIRECTION_LTR : Canvas.DIRECTION_RTL;
totalAdvance +=
paint.getTextRunAdvances(mChars, q, i - q, q, i - q, flags, mWidths, q);
if (i == e) {
break;
}
q = i;
level = mLevels[i];
}
}
return totalAdvance;
}
float addStyleRun(TextPaint paint, MetricAffectingSpan[] spans, int len,
Paint.FontMetricsInt fm) {
TextPaint workPaint = mWorkPaint;
workPaint.set(paint);
// XXX paint should not have a baseline shift, but...
workPaint.baselineShift = 0;
ReplacementSpan replacement = null;
for (int i = 0; i < spans.length; i++) {
MetricAffectingSpan span = spans[i];
if (span instanceof ReplacementSpan) {
replacement = (ReplacementSpan)span;
} else {
span.updateMeasureState(workPaint);
}
}
float wid;
if (replacement == null) {
wid = addStyleRun(workPaint, len, fm);
} else {
// Use original text. Shouldn't matter.
wid = replacement.getSize(workPaint, mText, mTextStart + mPos,
mTextStart + mPos + len, fm);
float[] w = mWidths;
w[mPos] = wid;
for (int i = mPos + 1, e = mPos + len; i < e; i++)
w[i] = 0;
}
if (fm != null) {
if (workPaint.baselineShift < 0) {
fm.ascent += workPaint.baselineShift;
fm.top += workPaint.baselineShift;
} else {
fm.descent += workPaint.baselineShift;
fm.bottom += workPaint.baselineShift;
}
}
return wid;
}
int breakText(int start, int limit, boolean forwards, float width) {
float[] w = mWidths;
if (forwards) {
for (int i = start; i < limit; ++i) {
if ((width -= w[i]) < 0) {
return i - start;
}
}
} else {
for (int i = limit; --i >= start;) {
if ((width -= w[i]) < 0) {
return limit - i -1;
}
}
}
return limit - start;
}
float measure(int start, int limit) {
float width = 0;
float[] w = mWidths;
for (int i = start; i < limit; ++i) {
width += w[i];
}
return width;
}
}
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