+++ /dev/null
-/*
- * 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 android.graphics;
-
-import com.android.ide.common.rendering.api.LayoutLog;
-import com.android.layoutlib.bridge.Bridge;
-import com.android.layoutlib.bridge.android.BridgeResources.NinePatchInputStream;
-import com.android.ninepatch.NinePatch;
-import com.android.ninepatch.NinePatchChunk;
-import com.android.resources.Density;
-
-import android.content.res.AssetManager;
-import android.content.res.Resources;
-import android.util.DisplayMetrics;
-import android.util.TypedValue;
-
-import java.io.BufferedInputStream;
-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 {
- 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 = true;
- inScaled = true;
- }
-
- /**
- * 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 will try to fulfill this request, but the resulting bitmap
- * may have different dimensions that precisely what has been requested.
- * Also, powers of 2 are often faster/easier for the decoder to honor.
- */
- 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).
- */
- public Bitmap.Config inPreferredConfig;
-
- /**
- * 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>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.
- */
- public boolean inScaled;
-
- /**
- * 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.
- *
- * 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.
- */
- public boolean inPurgeable;
-
- /**
- * 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.
- */
- public boolean inInputShareable;
-
- /**
- * Normally bitmap allocations count against the dalvik heap, which
- * means they help trigger GCs when a lot have been allocated. However,
- * in rare cases, the caller may want to allocate the bitmap outside of
- * that heap. To request that, set inNativeAlloc to true. In these
- * rare instances, it is solely up to the caller to ensure that OOM is
- * managed explicitly by calling bitmap.recycle() as soon as such a
- * bitmap is no longer needed.
- *
- * @hide pending API council approval
- */
- public boolean inNativeAlloc;
-
- /**
- * The resulting width of the bitmap, set independent of the state of
- * inJustDecodeBounds. However, if there is an error trying to decode,
- * outWidth will be set to -1.
- */
- public int outWidth;
-
- /**
- * The resulting height of the bitmap, set independent of the state of
- * inJustDecodeBounds. However, if there is an error trying to decode,
- * outHeight will be set to -1.
- */
- 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;
-
- private native void requestCancel();
-
- /**
- * 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;
-
- /**
- * 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;
- 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.
- */
- } 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.
- */
- Bridge.getLog().error(LayoutLog.TAG_RESOURCES_READ,
- String.format("Error decoding bitmap of id 0x%x", id), e, null /*data*/);
- } finally {
- try {
- if (is != null) is.close();
- } catch (IOException e) {
- // Ignore
- }
- }
-
- return bm;
- }
-
- /**
- * 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();
- }
-
- // FIXME: implement as needed, but it's unlikely that this is needed in the context of the bridge.
- return null;
- //return nativeDecodeByteArray(data, offset, length, opts);
- }
-
- /**
- * 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);
- }
-
- /**
- * 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)
- */
- 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;
- }
-
- boolean isNinePatch = is instanceof NinePatchInputStream;
-
- // we need mark/reset to work properly
-
- if (!is.markSupported()) {
- is = new BufferedInputStream(is, 16 * 1024);
- }
-
- // so we can call reset() if a given codec gives up after reading up to
- // this many bytes. FIXME: need to find out from the codecs what this
- // value should be.
- is.mark(1024);
-
- Bitmap bm;
-
- if (is instanceof AssetManager.AssetInputStream) {
- Bridge.getLog().error(LayoutLog.TAG_UNSUPPORTED,
- "Bitmap.decodeStream: " +
- "InputStream is unsupported (AssetManager.AssetInputStream)", null /*data*/);
- return null;
- } else {
- // pass some temp storage down to the native code. 1024 is made up,
- // but should be large enough to avoid too many small calls back
- // into is.read(...) This number is not related to the value passed
- // to mark(...) above.
- try {
- Density density = Density.MEDIUM;
- if (opts != null) {
- density = Density.getEnum(opts.inDensity);
- }
-
- if (isNinePatch) {
- // load the bitmap as a nine patch
- NinePatch ninePatch = NinePatch.load(is, true /*is9Patch*/, false /*convert*/);
-
- // get the bitmap and chunk objects.
- bm = Bitmap_Delegate.createBitmap(ninePatch.getImage(), true /*isMutable*/,
- density);
- NinePatchChunk chunk = ninePatch.getChunk();
-
- // put the chunk in the bitmap
- bm.setNinePatchChunk(NinePatch_Delegate.serialize(chunk));
-
- // read the padding
- int[] padding = chunk.getPadding();
- outPadding.left = padding[0];
- outPadding.top = padding[1];
- outPadding.right = padding[2];
- outPadding.bottom = padding[3];
- } else {
- // load the bitmap directly.
- bm = Bitmap_Delegate.createBitmap(is, true, density);
- }
- } catch (IOException e) {
- return null;
- }
- }
-
- return finishDecode(bm, outPadding, opts);
- }
-
- private static Bitmap finishDecode(Bitmap bm, Rect outPadding, Options opts) {
- if (bm == null || opts == null) {
- return bm;
- }
-
- final int density = opts.inDensity;
- if (density == 0) {
- return bm;
- }
-
- bm.setDensity(density);
- final int targetDensity = opts.inTargetDensity;
- if (targetDensity == 0 || density == targetDensity
- || density == opts.inScreenDensity) {
- return bm;
- }
-
- byte[] np = bm.getNinePatchChunk();
- final boolean isNinePatch = false; //np != null && NinePatch.isNinePatchChunk(np);
- if (opts.inScaled || isNinePatch) {
- float scale = targetDensity / (float)density;
- // TODO: This is very inefficient and should be done in native by Skia
- final Bitmap oldBitmap = bm;
- bm = Bitmap.createScaledBitmap(oldBitmap, (int) (bm.getWidth() * scale + 0.5f),
- (int) (bm.getHeight() * scale + 0.5f), true);
- oldBitmap.recycle();
-
- if (isNinePatch) {
- //np = nativeScaleNinePatch(np, scale, outPadding);
- bm.setNinePatchChunk(np);
- }
- bm.setDensity(targetDensity);
- }
-
- return bm;
- }
-
- /**
- * 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, or, if opts is non-null, if opts requested only the
- * size be returned (in opts.outWidth and opts.outHeight)
- */
- 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 is size returned.
- * @return the decoded bitmap, or null
- */
- public static Bitmap decodeFileDescriptor(FileDescriptor fd, Rect outPadding, Options opts) {
- return null;
-
- /* FIXME: implement as needed
- try {
- if (MemoryFile.isMemoryFile(fd)) {
- int mappedlength = MemoryFile.getMappedSize(fd);
- MemoryFile file = new MemoryFile(fd, mappedlength, "r");
- InputStream is = file.getInputStream();
- Bitmap bm = decodeStream(is, outPadding, opts);
- return finishDecode(bm, outPadding, opts);
- }
- } catch (IOException ex) {
- // invalid filedescriptor, no need to call nativeDecodeFileDescriptor()
- return null;
- }
- //Bitmap bm = nativeDecodeFileDescriptor(fd, outPadding, opts);
- //return finishDecode(bm, outPadding, opts);
- */
- }
-
- /**
- * 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);
- }
-}
-
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