109 lines
4.2 KiB
Java
109 lines
4.2 KiB
Java
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.inputmethod.latin.utils;
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import android.graphics.Paint;
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import android.graphics.Rect;
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import android.graphics.Typeface;
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import android.util.SparseArray;
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public final class TypefaceUtils {
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private static final char[] KEY_LABEL_REFERENCE_CHAR = { 'M' };
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private static final char[] KEY_NUMERIC_HINT_LABEL_REFERENCE_CHAR = { '8' };
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private TypefaceUtils() {
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// This utility class is not publicly instantiable.
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}
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// This sparse array caches key label text height in pixel indexed by key label text size.
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private static final SparseArray<Float> sTextHeightCache = new SparseArray<>();
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// Working variable for the following method.
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private static final Rect sTextHeightBounds = new Rect();
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private static float getCharHeight(final char[] referenceChar, final Paint paint) {
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final int key = getCharGeometryCacheKey(referenceChar[0], paint);
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synchronized (sTextHeightCache) {
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final Float cachedValue = sTextHeightCache.get(key);
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if (cachedValue != null) {
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return cachedValue;
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}
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paint.getTextBounds(referenceChar, 0, 1, sTextHeightBounds);
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final float height = sTextHeightBounds.height();
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sTextHeightCache.put(key, height);
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return height;
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}
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}
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// This sparse array caches key label text width in pixel indexed by key label text size.
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private static final SparseArray<Float> sTextWidthCache = new SparseArray<>();
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// Working variable for the following method.
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private static final Rect sTextWidthBounds = new Rect();
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private static float getCharWidth(final char[] referenceChar, final Paint paint) {
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final int key = getCharGeometryCacheKey(referenceChar[0], paint);
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synchronized (sTextWidthCache) {
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final Float cachedValue = sTextWidthCache.get(key);
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if (cachedValue != null) {
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return cachedValue;
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}
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paint.getTextBounds(referenceChar, 0, 1, sTextWidthBounds);
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final float width = sTextWidthBounds.width();
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sTextWidthCache.put(key, width);
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return width;
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}
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}
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private static int getCharGeometryCacheKey(final char referenceChar, final Paint paint) {
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final int labelSize = (int)paint.getTextSize();
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final Typeface face = paint.getTypeface();
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final int codePointOffset = referenceChar << 15;
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if (face == Typeface.DEFAULT) {
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return codePointOffset + labelSize;
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} else if (face == Typeface.DEFAULT_BOLD) {
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return codePointOffset + labelSize + 0x1000;
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} else if (face == Typeface.MONOSPACE) {
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return codePointOffset + labelSize + 0x2000;
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} else {
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return codePointOffset + labelSize;
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}
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}
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public static float getReferenceCharHeight(final Paint paint) {
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return getCharHeight(KEY_LABEL_REFERENCE_CHAR, paint);
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}
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public static float getReferenceCharWidth(final Paint paint) {
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return getCharWidth(KEY_LABEL_REFERENCE_CHAR, paint);
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}
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public static float getReferenceDigitWidth(final Paint paint) {
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return getCharWidth(KEY_NUMERIC_HINT_LABEL_REFERENCE_CHAR, paint);
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}
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// Working variable for the following method.
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private static final Rect sStringWidthBounds = new Rect();
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public static float getStringWidth(final String string, final Paint paint) {
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synchronized (sStringWidthBounds) {
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paint.getTextBounds(string, 0, string.length(), sStringWidthBounds);
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return sStringWidthBounds.width();
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}
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}
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}
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