From aa05711971753bb31cc01f46d4ab10fcf9f9af3b Mon Sep 17 00:00:00 2001 From: Michael Jurka Date: Thu, 12 Dec 2013 15:04:25 +0100 Subject: Create separate project for Wallpaper Picker Change-Id: Id9e855780b9fb68c63eb6e9f6c19bcbce28a6fd5 --- .../com/android/gallery3d/common/BitmapUtils.java | 260 +++++++++++++++++++++ 1 file changed, 260 insertions(+) create mode 100644 WallpaperPicker/src/com/android/gallery3d/common/BitmapUtils.java (limited to 'WallpaperPicker/src/com/android/gallery3d/common/BitmapUtils.java') diff --git a/WallpaperPicker/src/com/android/gallery3d/common/BitmapUtils.java b/WallpaperPicker/src/com/android/gallery3d/common/BitmapUtils.java new file mode 100644 index 000000000..a671ed2b9 --- /dev/null +++ b/WallpaperPicker/src/com/android/gallery3d/common/BitmapUtils.java @@ -0,0 +1,260 @@ +/* + * 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 com.android.gallery3d.common; + +import android.graphics.Bitmap; +import android.graphics.Bitmap.CompressFormat; +import android.graphics.BitmapFactory; +import android.graphics.Canvas; +import android.graphics.Matrix; +import android.graphics.Paint; +import android.os.Build; +import android.util.FloatMath; +import android.util.Log; + +import java.io.ByteArrayOutputStream; +import java.lang.reflect.InvocationTargetException; +import java.lang.reflect.Method; + +public class BitmapUtils { + private static final String TAG = "BitmapUtils"; + private static final int DEFAULT_JPEG_QUALITY = 90; + public static final int UNCONSTRAINED = -1; + + private BitmapUtils(){} + + /* + * Compute the sample size as a function of minSideLength + * and maxNumOfPixels. + * minSideLength is used to specify that minimal width or height of a + * bitmap. + * maxNumOfPixels is used to specify the maximal size in pixels that is + * tolerable in terms of memory usage. + * + * The function returns a sample size based on the constraints. + * Both size and minSideLength can be passed in as UNCONSTRAINED, + * which indicates no care of the corresponding constraint. + * The functions prefers returning a sample size that + * generates a smaller bitmap, unless minSideLength = UNCONSTRAINED. + * + * Also, the function rounds up the sample size to a power of 2 or multiple + * of 8 because BitmapFactory only honors sample size this way. + * For example, BitmapFactory downsamples an image by 2 even though the + * request is 3. So we round up the sample size to avoid OOM. + */ + public static int computeSampleSize(int width, int height, + int minSideLength, int maxNumOfPixels) { + int initialSize = computeInitialSampleSize( + width, height, minSideLength, maxNumOfPixels); + + return initialSize <= 8 + ? Utils.nextPowerOf2(initialSize) + : (initialSize + 7) / 8 * 8; + } + + private static int computeInitialSampleSize(int w, int h, + int minSideLength, int maxNumOfPixels) { + if (maxNumOfPixels == UNCONSTRAINED + && minSideLength == UNCONSTRAINED) return 1; + + int lowerBound = (maxNumOfPixels == UNCONSTRAINED) ? 1 : + (int) FloatMath.ceil(FloatMath.sqrt((float) (w * h) / maxNumOfPixels)); + + if (minSideLength == UNCONSTRAINED) { + return lowerBound; + } else { + int sampleSize = Math.min(w / minSideLength, h / minSideLength); + return Math.max(sampleSize, lowerBound); + } + } + + // This computes a sample size which makes the longer side at least + // minSideLength long. If that's not possible, return 1. + public static int computeSampleSizeLarger(int w, int h, + int minSideLength) { + int initialSize = Math.max(w / minSideLength, h / minSideLength); + if (initialSize <= 1) return 1; + + return initialSize <= 8 + ? Utils.prevPowerOf2(initialSize) + : initialSize / 8 * 8; + } + + // Find the min x that 1 / x >= scale + public static int computeSampleSizeLarger(float scale) { + int initialSize = (int) FloatMath.floor(1f / scale); + if (initialSize <= 1) return 1; + + return initialSize <= 8 + ? Utils.prevPowerOf2(initialSize) + : initialSize / 8 * 8; + } + + // Find the max x that 1 / x <= scale. + public static int computeSampleSize(float scale) { + Utils.assertTrue(scale > 0); + int initialSize = Math.max(1, (int) FloatMath.ceil(1 / scale)); + return initialSize <= 8 + ? Utils.nextPowerOf2(initialSize) + : (initialSize + 7) / 8 * 8; + } + + public static Bitmap resizeBitmapByScale( + Bitmap bitmap, float scale, boolean recycle) { + int width = Math.round(bitmap.getWidth() * scale); + int height = Math.round(bitmap.getHeight() * scale); + if (width == bitmap.getWidth() + && height == bitmap.getHeight()) return bitmap; + Bitmap target = Bitmap.createBitmap(width, height, getConfig(bitmap)); + Canvas canvas = new Canvas(target); + canvas.scale(scale, scale); + Paint paint = new Paint(Paint.FILTER_BITMAP_FLAG | Paint.DITHER_FLAG); + canvas.drawBitmap(bitmap, 0, 0, paint); + if (recycle) bitmap.recycle(); + return target; + } + + private static Bitmap.Config getConfig(Bitmap bitmap) { + Bitmap.Config config = bitmap.getConfig(); + if (config == null) { + config = Bitmap.Config.ARGB_8888; + } + return config; + } + + public static Bitmap resizeDownBySideLength( + Bitmap bitmap, int maxLength, boolean recycle) { + int srcWidth = bitmap.getWidth(); + int srcHeight = bitmap.getHeight(); + float scale = Math.min( + (float) maxLength / srcWidth, (float) maxLength / srcHeight); + if (scale >= 1.0f) return bitmap; + return resizeBitmapByScale(bitmap, scale, recycle); + } + + public static Bitmap resizeAndCropCenter(Bitmap bitmap, int size, boolean recycle) { + int w = bitmap.getWidth(); + int h = bitmap.getHeight(); + if (w == size && h == size) return bitmap; + + // scale the image so that the shorter side equals to the target; + // the longer side will be center-cropped. + float scale = (float) size / Math.min(w, h); + + Bitmap target = Bitmap.createBitmap(size, size, getConfig(bitmap)); + int width = Math.round(scale * bitmap.getWidth()); + int height = Math.round(scale * bitmap.getHeight()); + Canvas canvas = new Canvas(target); + canvas.translate((size - width) / 2f, (size - height) / 2f); + canvas.scale(scale, scale); + Paint paint = new Paint(Paint.FILTER_BITMAP_FLAG | Paint.DITHER_FLAG); + canvas.drawBitmap(bitmap, 0, 0, paint); + if (recycle) bitmap.recycle(); + return target; + } + + public static void recycleSilently(Bitmap bitmap) { + if (bitmap == null) return; + try { + bitmap.recycle(); + } catch (Throwable t) { + Log.w(TAG, "unable recycle bitmap", t); + } + } + + public static Bitmap rotateBitmap(Bitmap source, int rotation, boolean recycle) { + if (rotation == 0) return source; + int w = source.getWidth(); + int h = source.getHeight(); + Matrix m = new Matrix(); + m.postRotate(rotation); + Bitmap bitmap = Bitmap.createBitmap(source, 0, 0, w, h, m, true); + if (recycle) source.recycle(); + return bitmap; + } + + public static Bitmap createVideoThumbnail(String filePath) { + // MediaMetadataRetriever is available on API Level 8 + // but is hidden until API Level 10 + Class clazz = null; + Object instance = null; + try { + clazz = Class.forName("android.media.MediaMetadataRetriever"); + instance = clazz.newInstance(); + + Method method = clazz.getMethod("setDataSource", String.class); + method.invoke(instance, filePath); + + // The method name changes between API Level 9 and 10. + if (Build.VERSION.SDK_INT <= 9) { + return (Bitmap) clazz.getMethod("captureFrame").invoke(instance); + } else { + byte[] data = (byte[]) clazz.getMethod("getEmbeddedPicture").invoke(instance); + if (data != null) { + Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length); + if (bitmap != null) return bitmap; + } + return (Bitmap) clazz.getMethod("getFrameAtTime").invoke(instance); + } + } catch (IllegalArgumentException ex) { + // Assume this is a corrupt video file + } catch (RuntimeException ex) { + // Assume this is a corrupt video file. + } catch (InstantiationException e) { + Log.e(TAG, "createVideoThumbnail", e); + } catch (InvocationTargetException e) { + Log.e(TAG, "createVideoThumbnail", e); + } catch (ClassNotFoundException e) { + Log.e(TAG, "createVideoThumbnail", e); + } catch (NoSuchMethodException e) { + Log.e(TAG, "createVideoThumbnail", e); + } catch (IllegalAccessException e) { + Log.e(TAG, "createVideoThumbnail", e); + } finally { + try { + if (instance != null) { + clazz.getMethod("release").invoke(instance); + } + } catch (Exception ignored) { + } + } + return null; + } + + public static byte[] compressToBytes(Bitmap bitmap) { + return compressToBytes(bitmap, DEFAULT_JPEG_QUALITY); + } + + public static byte[] compressToBytes(Bitmap bitmap, int quality) { + ByteArrayOutputStream baos = new ByteArrayOutputStream(65536); + bitmap.compress(CompressFormat.JPEG, quality, baos); + return baos.toByteArray(); + } + + public static boolean isSupportedByRegionDecoder(String mimeType) { + if (mimeType == null) return false; + mimeType = mimeType.toLowerCase(); + return mimeType.startsWith("image/") && + (!mimeType.equals("image/gif") && !mimeType.endsWith("bmp")); + } + + public static boolean isRotationSupported(String mimeType) { + if (mimeType == null) return false; + mimeType = mimeType.toLowerCase(); + return mimeType.equals("image/jpeg"); + } +} -- cgit v1.2.3