| /* |
| * 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.keyboard; |
| |
| import android.graphics.Paint; |
| import android.graphics.Rect; |
| import android.graphics.Typeface; |
| import android.util.SparseArray; |
| |
| import com.android.inputmethod.latin.CollectionUtils; |
| |
| public final class TypefaceUtils { |
| 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 = CollectionUtils.newSparseArray(); |
| // Working variable for the following method. |
| private static final Rect sTextHeightBounds = new Rect(); |
| |
| public 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 = CollectionUtils.newSparseArray(); |
| // Working variable for the following method. |
| private static final Rect sTextWidthBounds = new Rect(); |
| |
| public 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 getLabelWidth(final String label, final Paint paint) { |
| final Rect textBounds = new Rect(); |
| paint.getTextBounds(label, 0, label.length(), textBounds); |
| return textBounds.width(); |
| } |
| } |