2022-10-02 23:06:56 +02:00
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/*
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* Copyright (C) 2007 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 android.graphics;
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import android.content.res.AssetManager;
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import android.content.res.Resources;
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import android.os.Trace;
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import android.util.DisplayMetrics;
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import android.util.Log;
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import android.util.TypedValue;
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import java.io.FileDescriptor;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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/**
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* Creates Bitmap objects from various sources, including files, streams,
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* and byte-arrays.
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*/
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public class BitmapFactory {
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private static final int DECODE_BUFFER_SIZE = 16 * 1024;
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public static class Options {
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/**
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* Create a default Options object, which if left unchanged will give
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* the same result from the decoder as if null were passed.
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*/
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public Options() {
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inDither = false;
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inScaled = true;
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inPremultiplied = true;
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}
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/**
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* If set, decode methods that take the Options object will attempt to
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* reuse this bitmap when loading content. If the decode operation
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* cannot use this bitmap, the decode method will return
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* <code>null</code> and will throw an IllegalArgumentException. The
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* current implementation necessitates that the reused bitmap be
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* mutable, and the resulting reused bitmap will continue to remain
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* mutable even when decoding a resource which would normally result in
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* an immutable bitmap.</p>
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*
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* <p>You should still always use the returned Bitmap of the decode
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* method and not assume that reusing the bitmap worked, due to the
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* constraints outlined above and failure situations that can occur.
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* Checking whether the return value matches the value of the inBitmap
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* set in the Options structure will indicate if the bitmap was reused,
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* but in all cases you should use the Bitmap returned by the decoding
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* function to ensure that you are using the bitmap that was used as the
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* decode destination.</p>
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*
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* <h3>Usage with BitmapFactory</h3>
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*
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* <p>As of {@link android.os.Build.VERSION_CODES#KITKAT}, any
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* mutable bitmap can be reused by {@link BitmapFactory} to decode any
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* other bitmaps as long as the resulting {@link Bitmap#getByteCount()
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* byte count} of the decoded bitmap is less than or equal to the {@link
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* Bitmap#getAllocationByteCount() allocated byte count} of the reused
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* bitmap. This can be because the intrinsic size is smaller, or its
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* size post scaling (for density / sample size) is smaller.</p>
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*
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* <p class="note">Prior to {@link android.os.Build.VERSION_CODES#KITKAT}
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* additional constraints apply: The image being decoded (whether as a
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* resource or as a stream) must be in jpeg or png format. Only equal
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* sized bitmaps are supported, with {@link #inSampleSize} set to 1.
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* Additionally, the {@link android.graphics.Bitmap.Config
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* configuration} of the reused bitmap will override the setting of
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* {@link #inPreferredConfig}, if set.</p>
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*
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* <h3>Usage with BitmapRegionDecoder</h3>
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*
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* <p>BitmapRegionDecoder will draw its requested content into the Bitmap
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* provided, clipping if the output content size (post scaling) is larger
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* than the provided Bitmap. The provided Bitmap's width, height, and
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* {@link Bitmap.Config} will not be changed.
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*
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* <p class="note">BitmapRegionDecoder support for {@link #inBitmap} was
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* introduced in {@link android.os.Build.VERSION_CODES#JELLY_BEAN}. All
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* formats supported by BitmapRegionDecoder support Bitmap reuse via
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* {@link #inBitmap}.</p>
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*
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* @see Bitmap#reconfigure(int,int, android.graphics.Bitmap.Config)
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*/
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public Bitmap inBitmap;
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/**
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* If set, decode methods will always return a mutable Bitmap instead of
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* an immutable one. This can be used for instance to programmatically apply
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* effects to a Bitmap loaded through BitmapFactory.
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*/
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@SuppressWarnings({"UnusedDeclaration"}) // used in native code
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public boolean inMutable;
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/**
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* If set to true, the decoder will return null (no bitmap), but
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* the out... fields will still be set, allowing the caller to query
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* the bitmap without having to allocate the memory for its pixels.
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*/
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public boolean inJustDecodeBounds;
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/**
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* If set to a value > 1, requests the decoder to subsample the original
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* image, returning a smaller image to save memory. The sample size is
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* the number of pixels in either dimension that correspond to a single
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* pixel in the decoded bitmap. For example, inSampleSize == 4 returns
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* an image that is 1/4 the width/height of the original, and 1/16 the
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* number of pixels. Any value <= 1 is treated the same as 1. Note: the
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* decoder uses a final value based on powers of 2, any other value will
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* be rounded down to the nearest power of 2.
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*/
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public int inSampleSize;
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/**
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* If this is non-null, the decoder will try to decode into this
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* internal configuration. If it is null, or the request cannot be met,
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* the decoder will try to pick the best matching config based on the
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* system's screen depth, and characteristics of the original image such
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* as if it has per-pixel alpha (requiring a config that also does).
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*
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* Image are loaded with the {@link Bitmap.Config#ARGB_8888} config by
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* default.
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*/
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public Bitmap.Config inPreferredConfig = Bitmap.Config.ARGB_8888;
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/**
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* If true (which is the default), the resulting bitmap will have its
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* color channels pre-multipled by the alpha channel.
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*
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* <p>This should NOT be set to false for images to be directly drawn by
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* the view system or through a {@link Canvas}. The view system and
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* {@link Canvas} assume all drawn images are pre-multiplied to simplify
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* draw-time blending, and will throw a RuntimeException when
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* un-premultiplied are drawn.</p>
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*
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* <p>This is likely only useful if you want to manipulate raw encoded
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* image data, e.g. with RenderScript or custom OpenGL.</p>
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*
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* <p>This does not affect bitmaps without an alpha channel.</p>
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*
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* <p>Setting this flag to false while setting {@link #inScaled} to true
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* may result in incorrect colors.</p>
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*
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* @see Bitmap#hasAlpha()
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* @see Bitmap#isPremultiplied()
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* @see #inScaled
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*/
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public boolean inPremultiplied;
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/**
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* If dither is true, the decoder will attempt to dither the decoded
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* image.
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*/
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public boolean inDither;
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/**
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* The pixel density to use for the bitmap. This will always result
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* in the returned bitmap having a density set for it (see
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* {@link Bitmap#setDensity(int) Bitmap.setDensity(int)}). In addition,
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* if {@link #inScaled} is set (which it is by default} and this
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* density does not match {@link #inTargetDensity}, then the bitmap
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* will be scaled to the target density before being returned.
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*
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* <p>If this is 0,
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* {@link BitmapFactory#decodeResource(Resources, int)},
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* {@link BitmapFactory#decodeResource(Resources, int, android.graphics.BitmapFactory.Options)},
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* and {@link BitmapFactory#decodeResourceStream}
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* will fill in the density associated with the resource. The other
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* functions will leave it as-is and no density will be applied.
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*
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* @see #inTargetDensity
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* @see #inScreenDensity
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* @see #inScaled
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* @see Bitmap#setDensity(int)
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* @see android.util.DisplayMetrics#densityDpi
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*/
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public int inDensity;
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/**
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* The pixel density of the destination this bitmap will be drawn to.
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* This is used in conjunction with {@link #inDensity} and
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* {@link #inScaled} to determine if and how to scale the bitmap before
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* returning it.
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*
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* <p>If this is 0,
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* {@link BitmapFactory#decodeResource(Resources, int)},
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* {@link BitmapFactory#decodeResource(Resources, int, android.graphics.BitmapFactory.Options)},
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* and {@link BitmapFactory#decodeResourceStream}
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* will fill in the density associated the Resources object's
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* DisplayMetrics. The other
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* functions will leave it as-is and no scaling for density will be
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* performed.
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*
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* @see #inDensity
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* @see #inScreenDensity
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* @see #inScaled
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* @see android.util.DisplayMetrics#densityDpi
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*/
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public int inTargetDensity;
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/**
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* The pixel density of the actual screen that is being used. This is
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* purely for applications running in density compatibility code, where
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* {@link #inTargetDensity} is actually the density the application
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* sees rather than the real screen density.
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*
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* <p>By setting this, you
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* allow the loading code to avoid scaling a bitmap that is currently
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* in the screen density up/down to the compatibility density. Instead,
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* if {@link #inDensity} is the same as {@link #inScreenDensity}, the
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* bitmap will be left as-is. Anything using the resulting bitmap
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* must also used {@link Bitmap#getScaledWidth(int)
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* Bitmap.getScaledWidth} and {@link Bitmap#getScaledHeight
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* Bitmap.getScaledHeight} to account for any different between the
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* bitmap's density and the target's density.
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*
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* <p>This is never set automatically for the caller by
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* {@link BitmapFactory} itself. It must be explicitly set, since the
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* caller must deal with the resulting bitmap in a density-aware way.
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*
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* @see #inDensity
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* @see #inTargetDensity
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* @see #inScaled
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* @see android.util.DisplayMetrics#densityDpi
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*/
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public int inScreenDensity;
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/**
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* When this flag is set, if {@link #inDensity} and
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* {@link #inTargetDensity} are not 0, the
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* bitmap will be scaled to match {@link #inTargetDensity} when loaded,
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* rather than relying on the graphics system scaling it each time it
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* is drawn to a Canvas.
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*
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* <p>BitmapRegionDecoder ignores this flag, and will not scale output
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* based on density. (though {@link #inSampleSize} is supported)</p>
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*
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* <p>This flag is turned on by default and should be turned off if you need
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* a non-scaled version of the bitmap. Nine-patch bitmaps ignore this
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* flag and are always scaled.
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*
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* <p>If {@link #inPremultiplied} is set to false, and the image has alpha,
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* setting this flag to true may result in incorrect colors.
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*/
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public boolean inScaled;
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/**
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* If this is set to true, then the resulting bitmap will allocate its
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* pixels such that they can be purged if the system needs to reclaim
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* memory. In that instance, when the pixels need to be accessed again
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* (e.g. the bitmap is drawn, getPixels() is called), they will be
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* automatically re-decoded.
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*
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* <p>For the re-decode to happen, the bitmap must have access to the
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* encoded data, either by sharing a reference to the input
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* or by making a copy of it. This distinction is controlled by
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* inInputShareable. If this is true, then the bitmap may keep a shallow
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* reference to the input. If this is false, then the bitmap will
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* explicitly make a copy of the input data, and keep that. Even if
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* sharing is allowed, the implementation may still decide to make a
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* deep copy of the input data.</p>
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*
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* <p>While inPurgeable can help avoid big Dalvik heap allocations (from
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* API level 11 onward), it sacrifices performance predictability since any
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* image that the view system tries to draw may incur a decode delay which
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* can lead to dropped frames. Therefore, most apps should avoid using
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* inPurgeable to allow for a fast and fluid UI. To minimize Dalvik heap
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* allocations use the {@link #inBitmap} flag instead.</p>
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*
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* <p class="note"><strong>Note:</strong> This flag is ignored when used
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* with {@link #decodeResource(Resources, int,
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* android.graphics.BitmapFactory.Options)} or {@link #decodeFile(String,
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* android.graphics.BitmapFactory.Options)}.</p>
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*/
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public boolean inPurgeable;
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/**
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* This field works in conjuction with inPurgeable. If inPurgeable is
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* false, then this field is ignored. If inPurgeable is true, then this
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* field determines whether the bitmap can share a reference to the
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* input data (inputstream, array, etc.) or if it must make a deep copy.
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*/
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public boolean inInputShareable;
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/**
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* If inPreferQualityOverSpeed is set to true, the decoder will try to
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* decode the reconstructed image to a higher quality even at the
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* expense of the decoding speed. Currently the field only affects JPEG
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* decode, in the case of which a more accurate, but slightly slower,
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* IDCT method will be used instead.
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*/
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public boolean inPreferQualityOverSpeed;
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/**
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* The resulting width of the bitmap, set independent of the state of
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* inJustDecodeBounds. However, if there is an error trying to decode,
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* outWidth will be set to -1.
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*/
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public int outWidth;
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/**
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* The resulting height of the bitmap, set independent of the state of
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* inJustDecodeBounds. However, if there is an error trying to decode,
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* outHeight will be set to -1.
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*/
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public int outHeight;
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/**
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* If known, this string is set to the mimetype of the decoded image.
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* If not know, or there is an error, it is set to null.
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*/
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public String outMimeType;
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/**
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* Temp storage to use for decoding. Suggest 16K or so.
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*/
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public byte[] inTempStorage;
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private native void requestCancel();
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/**
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* Flag to indicate that cancel has been called on this object. This
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* is useful if there's an intermediary that wants to first decode the
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* bounds and then decode the image. In that case the intermediary
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* can check, inbetween the bounds decode and the image decode, to see
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* if the operation is canceled.
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*/
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public boolean mCancel;
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/**
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* This can be called from another thread while this options object is
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* inside a decode... call. Calling this will notify the decoder that
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* it should cancel its operation. This is not guaranteed to cancel
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* the decode, but if it does, the decoder... operation will return
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* null, or if inJustDecodeBounds is true, will set outWidth/outHeight
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|
|
* to -1
|
|
|
|
*/
|
|
|
|
public void requestCancelDecode() {
|
|
|
|
mCancel = true;
|
|
|
|
requestCancel();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Decode a file path into a bitmap. If the specified file name is null,
|
|
|
|
* or cannot be decoded into a bitmap, the function returns null.
|
|
|
|
*
|
|
|
|
* @param pathName complete path name for the file to be decoded.
|
|
|
|
* @param opts null-ok; Options that control downsampling and whether the
|
|
|
|
* image should be completely decoded, or just is size returned.
|
|
|
|
* @return The decoded bitmap, or null if the image data could not be
|
|
|
|
* decoded, or, if opts is non-null, if opts requested only the
|
|
|
|
* size be returned (in opts.outWidth and opts.outHeight)
|
|
|
|
*/
|
|
|
|
public static Bitmap decodeFile(String pathName, Options opts) {
|
|
|
|
Bitmap bm = null;
|
|
|
|
InputStream stream = null;
|
|
|
|
try {
|
|
|
|
stream = new FileInputStream(pathName);
|
|
|
|
bm = decodeStream(stream, null, opts);
|
|
|
|
} catch (Exception e) {
|
|
|
|
/* do nothing.
|
|
|
|
If the exception happened on open, bm will be null.
|
|
|
|
*/
|
|
|
|
Log.e("BitmapFactory", "Unable to decode stream: " + e);
|
|
|
|
} finally {
|
|
|
|
if (stream != null) {
|
|
|
|
try {
|
|
|
|
stream.close();
|
|
|
|
} catch (IOException e) {
|
|
|
|
// do nothing here
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return bm;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Decode a file path into a bitmap. If the specified file name is null,
|
|
|
|
* or cannot be decoded into a bitmap, the function returns null.
|
|
|
|
*
|
|
|
|
* @param pathName complete path name for the file to be decoded.
|
|
|
|
* @return the resulting decoded bitmap, or null if it could not be decoded.
|
|
|
|
*/
|
|
|
|
public static Bitmap decodeFile(String pathName) {
|
|
|
|
return decodeFile(pathName, null);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Decode a new Bitmap from an InputStream. This InputStream was obtained from
|
|
|
|
* resources, which we pass to be able to scale the bitmap accordingly.
|
|
|
|
*/
|
|
|
|
public static Bitmap decodeResourceStream(Resources res, TypedValue value,
|
|
|
|
InputStream is, Rect pad, Options opts) {
|
|
|
|
|
|
|
|
if (opts == null) {
|
|
|
|
opts = new Options();
|
|
|
|
}
|
|
|
|
|
|
|
|
if (opts.inDensity == 0 && value != null) {
|
|
|
|
final int density = value.density;
|
|
|
|
if (density == TypedValue.DENSITY_DEFAULT) {
|
|
|
|
opts.inDensity = DisplayMetrics.DENSITY_DEFAULT;
|
|
|
|
} else if (density != TypedValue.DENSITY_NONE) {
|
|
|
|
opts.inDensity = density;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (opts.inTargetDensity == 0 && res != null) {
|
|
|
|
opts.inTargetDensity = res.getDisplayMetrics().densityDpi;
|
|
|
|
}
|
|
|
|
|
|
|
|
return decodeStream(is, pad, opts);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Synonym for opening the given resource and calling
|
|
|
|
* {@link #decodeResourceStream}.
|
|
|
|
*
|
|
|
|
* @param res The resources object containing the image data
|
|
|
|
* @param id The resource id of the image data
|
|
|
|
* @param opts null-ok; Options that control downsampling and whether the
|
|
|
|
* image should be completely decoded, or just is size returned.
|
|
|
|
* @return The decoded bitmap, or null if the image data could not be
|
|
|
|
* decoded, or, if opts is non-null, if opts requested only the
|
|
|
|
* size be returned (in opts.outWidth and opts.outHeight)
|
|
|
|
*/
|
|
|
|
public static Bitmap decodeResource(Resources res, int id, Options opts) {
|
|
|
|
String path = res.getString(id);
|
|
|
|
|
|
|
|
return new Bitmap(path);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Synonym for {@link #decodeResource(Resources, int, android.graphics.BitmapFactory.Options)}
|
|
|
|
* will null Options.
|
|
|
|
*
|
|
|
|
* @param res The resources object containing the image data
|
|
|
|
* @param id The resource id of the image data
|
|
|
|
* @return The decoded bitmap, or null if the image could not be decode.
|
|
|
|
*/
|
|
|
|
public static Bitmap decodeResource(Resources res, int id) {
|
|
|
|
return decodeResource(res, id, null);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Decode an immutable bitmap from the specified byte array.
|
|
|
|
*
|
|
|
|
* @param data byte array of compressed image data
|
|
|
|
* @param offset offset into imageData for where the decoder should begin
|
|
|
|
* parsing.
|
|
|
|
* @param length the number of bytes, beginning at offset, to parse
|
|
|
|
* @param opts null-ok; Options that control downsampling and whether the
|
|
|
|
* image should be completely decoded, or just is size returned.
|
|
|
|
* @return The decoded bitmap, or null if the image data could not be
|
|
|
|
* decoded, or, if opts is non-null, if opts requested only the
|
|
|
|
* size be returned (in opts.outWidth and opts.outHeight)
|
|
|
|
*/
|
|
|
|
public static Bitmap decodeByteArray(byte[] data, int offset, int length, Options opts) {
|
|
|
|
if ((offset | length) < 0 || data.length < offset + length) {
|
|
|
|
throw new ArrayIndexOutOfBoundsException();
|
|
|
|
}
|
|
|
|
|
|
|
|
Bitmap bm;
|
|
|
|
|
|
|
|
Trace.traceBegin(Trace.TRACE_TAG_GRAPHICS, "decodeBitmap");
|
|
|
|
try {
|
|
|
|
bm = nativeDecodeByteArray(data, offset, length, opts);
|
|
|
|
|
|
|
|
if (bm == null && opts != null && opts.inBitmap != null) {
|
|
|
|
throw new IllegalArgumentException("Problem decoding into existing bitmap");
|
|
|
|
}
|
|
|
|
setDensityFromOptions(bm, opts);
|
|
|
|
} finally {
|
|
|
|
Trace.traceEnd(Trace.TRACE_TAG_GRAPHICS);
|
|
|
|
}
|
|
|
|
|
|
|
|
return bm;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Decode an immutable bitmap from the specified byte array.
|
|
|
|
*
|
|
|
|
* @param data byte array of compressed image data
|
|
|
|
* @param offset offset into imageData for where the decoder should begin
|
|
|
|
* parsing.
|
|
|
|
* @param length the number of bytes, beginning at offset, to parse
|
|
|
|
* @return The decoded bitmap, or null if the image could not be decode.
|
|
|
|
*/
|
|
|
|
public static Bitmap decodeByteArray(byte[] data, int offset, int length) {
|
|
|
|
return decodeByteArray(data, offset, length, null);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Set the newly decoded bitmap's density based on the Options.
|
|
|
|
*/
|
|
|
|
private static void setDensityFromOptions(Bitmap outputBitmap, Options opts) {/*
|
|
|
|
if (outputBitmap == null || opts == null) return;
|
|
|
|
|
|
|
|
final int density = opts.inDensity;
|
|
|
|
if (density != 0) {
|
|
|
|
outputBitmap.setDensity(density);
|
|
|
|
final int targetDensity = opts.inTargetDensity;
|
|
|
|
if (targetDensity == 0 || density == targetDensity || density == opts.inScreenDensity) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
byte[] np = outputBitmap.getNinePatchChunk();
|
|
|
|
final boolean isNinePatch = np != null && NinePatch.isNinePatchChunk(np);
|
|
|
|
if (opts.inScaled || isNinePatch) {
|
|
|
|
outputBitmap.setDensity(targetDensity);
|
|
|
|
}
|
|
|
|
} else if (opts.inBitmap != null) {
|
|
|
|
// bitmap was reused, ensure density is reset
|
|
|
|
outputBitmap.setDensity(Bitmap.getDefaultDensity());
|
|
|
|
}
|
|
|
|
*/}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Decode an input stream into a bitmap. If the input stream is null, or
|
|
|
|
* cannot be used to decode a bitmap, the function returns null.
|
|
|
|
* The stream's position will be where ever it was after the encoded data
|
|
|
|
* was read.
|
|
|
|
*
|
|
|
|
* @param is The input stream that holds the raw data to be decoded into a
|
|
|
|
* bitmap.
|
|
|
|
* @param outPadding If not null, return the padding rect for the bitmap if
|
|
|
|
* it exists, otherwise set padding to [-1,-1,-1,-1]. If
|
|
|
|
* no bitmap is returned (null) then padding is
|
|
|
|
* unchanged.
|
|
|
|
* @param opts null-ok; Options that control downsampling and whether the
|
|
|
|
* image should be completely decoded, or just is size returned.
|
|
|
|
* @return The decoded bitmap, or null if the image data could not be
|
|
|
|
* decoded, or, if opts is non-null, if opts requested only the
|
|
|
|
* size be returned (in opts.outWidth and opts.outHeight)
|
|
|
|
*
|
|
|
|
* <p class="note">Prior to {@link android.os.Build.VERSION_CODES#KITKAT},
|
|
|
|
* if {@link InputStream#markSupported is.markSupported()} returns true,
|
|
|
|
* <code>is.mark(1024)</code> would be called. As of
|
|
|
|
* {@link android.os.Build.VERSION_CODES#KITKAT}, this is no longer the case.</p>
|
|
|
|
*/
|
|
|
|
public static Bitmap decodeStream(InputStream is, Rect outPadding, Options opts) {
|
|
|
|
// we don't throw in this case, thus allowing the caller to only check
|
|
|
|
// the cache, and not force the image to be decoded.
|
|
|
|
if (is == null) {
|
|
|
|
return null;
|
|
|
|
}
|
|
|
|
|
|
|
|
Bitmap bm = null;
|
|
|
|
|
|
|
|
Trace.traceBegin(Trace.TRACE_TAG_GRAPHICS, "decodeBitmap");
|
|
|
|
try {
|
|
|
|
if (is instanceof AssetManager.AssetInputStream) {
|
2023-06-18 11:09:52 +02:00
|
|
|
final String fileName = ((AssetManager.AssetInputStream) is).fileName;
|
|
|
|
bm = new Bitmap(fileName);
|
2022-10-02 23:06:56 +02:00
|
|
|
} else {
|
|
|
|
bm = decodeStreamInternal(is, outPadding, opts);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (bm == null && opts != null && opts.inBitmap != null) {
|
|
|
|
throw new IllegalArgumentException("Problem decoding into existing bitmap");
|
|
|
|
}
|
|
|
|
|
|
|
|
setDensityFromOptions(bm, opts);
|
|
|
|
} finally {
|
|
|
|
Trace.traceEnd(Trace.TRACE_TAG_GRAPHICS);
|
|
|
|
}
|
|
|
|
|
|
|
|
return bm;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Private helper function for decoding an InputStream natively. Buffers the input enough to
|
|
|
|
* do a rewind as needed, and supplies temporary storage if necessary. is MUST NOT be null.
|
|
|
|
*/
|
|
|
|
private static Bitmap decodeStreamInternal(InputStream is, Rect outPadding, Options opts) {
|
|
|
|
// ASSERT(is != null);
|
|
|
|
byte [] tempStorage = null;
|
|
|
|
if (opts != null) tempStorage = opts.inTempStorage;
|
|
|
|
if (tempStorage == null) tempStorage = new byte[DECODE_BUFFER_SIZE];
|
|
|
|
return nativeDecodeStream(is, tempStorage, outPadding, opts);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Decode an input stream into a bitmap. If the input stream is null, or
|
|
|
|
* cannot be used to decode a bitmap, the function returns null.
|
|
|
|
* The stream's position will be where ever it was after the encoded data
|
|
|
|
* was read.
|
|
|
|
*
|
|
|
|
* @param is The input stream that holds the raw data to be decoded into a
|
|
|
|
* bitmap.
|
|
|
|
* @return The decoded bitmap, or null if the image data could not be decoded.
|
|
|
|
*/
|
|
|
|
public static Bitmap decodeStream(InputStream is) {
|
|
|
|
return decodeStream(is, null, null);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Decode a bitmap from the file descriptor. If the bitmap cannot be decoded
|
|
|
|
* return null. The position within the descriptor will not be changed when
|
|
|
|
* this returns, so the descriptor can be used again as-is.
|
|
|
|
*
|
|
|
|
* @param fd The file descriptor containing the bitmap data to decode
|
|
|
|
* @param outPadding If not null, return the padding rect for the bitmap if
|
|
|
|
* it exists, otherwise set padding to [-1,-1,-1,-1]. If
|
|
|
|
* no bitmap is returned (null) then padding is
|
|
|
|
* unchanged.
|
|
|
|
* @param opts null-ok; Options that control downsampling and whether the
|
|
|
|
* image should be completely decoded, or just its size returned.
|
|
|
|
* @return the decoded bitmap, or null
|
|
|
|
*/
|
|
|
|
public static Bitmap decodeFileDescriptor(FileDescriptor fd, Rect outPadding, Options opts) {
|
|
|
|
Bitmap bm;
|
|
|
|
|
|
|
|
Trace.traceBegin(Trace.TRACE_TAG_GRAPHICS, "decodeFileDescriptor");
|
|
|
|
try {
|
|
|
|
if (nativeIsSeekable(fd)) {
|
|
|
|
bm = nativeDecodeFileDescriptor(fd, outPadding, opts);
|
|
|
|
} else {
|
|
|
|
FileInputStream fis = new FileInputStream(fd);
|
|
|
|
try {
|
|
|
|
bm = decodeStreamInternal(fis, outPadding, opts);
|
|
|
|
} finally {
|
|
|
|
try {
|
|
|
|
fis.close();
|
|
|
|
} catch (Throwable t) {/* ignore */}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (bm == null && opts != null && opts.inBitmap != null) {
|
|
|
|
throw new IllegalArgumentException("Problem decoding into existing bitmap");
|
|
|
|
}
|
|
|
|
|
|
|
|
setDensityFromOptions(bm, opts);
|
|
|
|
} finally {
|
|
|
|
Trace.traceEnd(Trace.TRACE_TAG_GRAPHICS);
|
|
|
|
}
|
|
|
|
return bm;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Decode a bitmap from the file descriptor. If the bitmap cannot be decoded
|
|
|
|
* return null. The position within the descriptor will not be changed when
|
|
|
|
* this returns, so the descriptor can be used again as is.
|
|
|
|
*
|
|
|
|
* @param fd The file descriptor containing the bitmap data to decode
|
|
|
|
* @return the decoded bitmap, or null
|
|
|
|
*/
|
|
|
|
public static Bitmap decodeFileDescriptor(FileDescriptor fd) {
|
|
|
|
return decodeFileDescriptor(fd, null, null);
|
|
|
|
}
|
|
|
|
|
|
|
|
private static native Bitmap nativeDecodeStream(InputStream is, byte[] storage,
|
|
|
|
Rect padding, Options opts);
|
|
|
|
private static native Bitmap nativeDecodeFileDescriptor(FileDescriptor fd,
|
|
|
|
Rect padding, Options opts);
|
|
|
|
private static native Bitmap nativeDecodeAsset(int asset, Rect padding, Options opts);
|
|
|
|
private static native Bitmap nativeDecodeByteArray(byte[] data, int offset,
|
|
|
|
int length, Options opts);
|
|
|
|
private static native boolean nativeIsSeekable(FileDescriptor fd);
|
|
|
|
}
|