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/*
* Copyright (C) 2013 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 com.android.inputmethod.latin.utils;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.util.SparseArray;
public final class TypefaceUtils {
private static final char[] KEY_LABEL_REFERENCE_CHAR = { 'M' };
private static final char[] KEY_NUMERIC_HINT_LABEL_REFERENCE_CHAR = { '8' };
private TypefaceUtils() {
// This utility class is not publicly instantiable.
}
// This sparse array caches key label text height in pixel indexed by key label text size.
private static final SparseArray<Float> sTextHeightCache = new SparseArray<>();
// Working variable for the following method.
private static final Rect sTextHeightBounds = new Rect();
private static float getCharHeight(final char[] referenceChar, final Paint paint) {
final int key = getCharGeometryCacheKey(referenceChar[0], paint);
synchronized (sTextHeightCache) {
final Float cachedValue = sTextHeightCache.get(key);
if (cachedValue != null) {
return cachedValue;
}
paint.getTextBounds(referenceChar, 0, 1, sTextHeightBounds);
final float height = sTextHeightBounds.height();
sTextHeightCache.put(key, height);
return height;
}
}
// This sparse array caches key label text width in pixel indexed by key label text size.
private static final SparseArray<Float> sTextWidthCache = new SparseArray<>();
// Working variable for the following method.
private static final Rect sTextWidthBounds = new Rect();
private static float getCharWidth(final char[] referenceChar, final Paint paint) {
final int key = getCharGeometryCacheKey(referenceChar[0], paint);
synchronized (sTextWidthCache) {
final Float cachedValue = sTextWidthCache.get(key);
if (cachedValue != null) {
return cachedValue;
}
paint.getTextBounds(referenceChar, 0, 1, sTextWidthBounds);
final float width = sTextWidthBounds.width();
sTextWidthCache.put(key, width);
return width;
}
}
private static int getCharGeometryCacheKey(final char referenceChar, final Paint paint) {
final int labelSize = (int)paint.getTextSize();
final Typeface face = paint.getTypeface();
final int codePointOffset = referenceChar << 15;
if (face == Typeface.DEFAULT) {
return codePointOffset + labelSize;
} else if (face == Typeface.DEFAULT_BOLD) {
return codePointOffset + labelSize + 0x1000;
} else if (face == Typeface.MONOSPACE) {
return codePointOffset + labelSize + 0x2000;
} else {
return codePointOffset + labelSize;
}
}
public static float getReferenceCharHeight(final Paint paint) {
return getCharHeight(KEY_LABEL_REFERENCE_CHAR, paint);
}
public static float getReferenceCharWidth(final Paint paint) {
return getCharWidth(KEY_LABEL_REFERENCE_CHAR, paint);
}
public static float getReferenceDigitWidth(final Paint paint) {
return getCharWidth(KEY_NUMERIC_HINT_LABEL_REFERENCE_CHAR, paint);
}
// Working variable for the following method.
private static final Rect sStringWidthBounds = new Rect();
public static float getStringWidth(final String string, final Paint paint) {
synchronized (sStringWidthBounds) {
paint.getTextBounds(string, 0, string.length(), sStringWidthBounds);
return sStringWidthBounds.width();
}
}
}
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