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