Examples with BitmapRegionDecoder android.graphics.BitmapRegionDecoder used on opensource projects

Example 21 with BitmapRegionDecoder

use of android.graphics.BitmapRegionDecoder in project android_frameworks_base by crdroidandroid.

the class WallpaperManagerService method generateCrop.

/**
     * Once a new wallpaper has been written via setWallpaper(...), it needs to be cropped
     * for display.
     */
private void generateCrop(WallpaperData wallpaper) {
    boolean success = false;
    Rect cropHint = new Rect(wallpaper.cropHint);
    if (DEBUG) {
        Slog.v(TAG, "Generating crop for new wallpaper(s): 0x" + Integer.toHexString(wallpaper.whichPending) + " to " + wallpaper.cropFile.getName() + " crop=(" + cropHint.width() + 'x' + cropHint.height() + ") dim=(" + wallpaper.width + 'x' + wallpaper.height + ')');
    }
    // Analyse the source; needed in multiple cases
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(wallpaper.wallpaperFile.getAbsolutePath(), options);
    if (options.outWidth <= 0 || options.outHeight <= 0) {
        Slog.e(TAG, "Invalid wallpaper data");
        success = false;
    } else {
        boolean needCrop = false;
        boolean needScale = false;
        // Empty crop means use the full image
        if (cropHint.isEmpty()) {
            cropHint.left = cropHint.top = 0;
            cropHint.right = options.outWidth;
            cropHint.bottom = options.outHeight;
        } else {
            // force the crop rect to lie within the measured bounds
            cropHint.offset((cropHint.right > options.outWidth ? options.outWidth - cropHint.right : 0), (cropHint.bottom > options.outHeight ? options.outHeight - cropHint.bottom : 0));
            // If the crop hint was larger than the image we just overshot. Patch things up.
            if (cropHint.left < 0) {
                cropHint.left = 0;
            }
            if (cropHint.top < 0) {
                cropHint.top = 0;
            }
            // Don't bother cropping if what we're left with is identity
            needCrop = (options.outHeight > cropHint.height() || options.outWidth > cropHint.width());
        }
        // scale if the crop height winds up not matching the recommended metrics
        needScale = (wallpaper.height != cropHint.height());
        if (DEBUG) {
            Slog.v(TAG, "crop: w=" + cropHint.width() + " h=" + cropHint.height());
            Slog.v(TAG, "dims: w=" + wallpaper.width + " h=" + wallpaper.height);
            Slog.v(TAG, "meas: w=" + options.outWidth + " h=" + options.outHeight);
            Slog.v(TAG, "crop?=" + needCrop + " scale?=" + needScale);
        }
        if (!needCrop && !needScale) {
            // the whole thing and just copy the image file directly.
            if (DEBUG) {
                Slog.v(TAG, "Null crop of new wallpaper; copying");
            }
            success = FileUtils.copyFile(wallpaper.wallpaperFile, wallpaper.cropFile);
            if (!success) {
                wallpaper.cropFile.delete();
            // TODO: fall back to default wallpaper in this case
            }
        } else {
            // Fancy case: crop and scale.  First, we decode and scale down if appropriate.
            FileOutputStream f = null;
            BufferedOutputStream bos = null;
            try {
                BitmapRegionDecoder decoder = BitmapRegionDecoder.newInstance(wallpaper.wallpaperFile.getAbsolutePath(), false);
                // This actually downsamples only by powers of two, but that's okay; we do
                // a proper scaling blit later.  This is to minimize transient RAM use.
                // We calculate the largest power-of-two under the actual ratio rather than
                // just let the decode take care of it because we also want to remap where the
                // cropHint rectangle lies in the decoded [super]rect.
                final BitmapFactory.Options scaler;
                final int actualScale = cropHint.height() / wallpaper.height;
                int scale = 1;
                while (2 * scale < actualScale) {
                    scale *= 2;
                }
                if (scale > 1) {
                    scaler = new BitmapFactory.Options();
                    scaler.inSampleSize = scale;
                    if (DEBUG) {
                        Slog.v(TAG, "Downsampling cropped rect with scale " + scale);
                    }
                } else {
                    scaler = null;
                }
                Bitmap cropped = decoder.decodeRegion(cropHint, scaler);
                decoder.recycle();
                if (cropped == null) {
                    Slog.e(TAG, "Could not decode new wallpaper");
                } else {
                    // We've got the extracted crop; now we want to scale it properly to
                    // the desired rectangle.  That's a height-biased operation: make it
                    // fit the hinted height, and accept whatever width we end up with.
                    cropHint.offsetTo(0, 0);
                    // adjust by downsampling factor
                    cropHint.right /= scale;
                    cropHint.bottom /= scale;
                    final float heightR = ((float) wallpaper.height) / ((float) cropHint.height());
                    if (DEBUG) {
                        Slog.v(TAG, "scale " + heightR + ", extracting " + cropHint);
                    }
                    final int destWidth = (int) (cropHint.width() * heightR);
                    final Bitmap finalCrop = Bitmap.createScaledBitmap(cropped, destWidth, wallpaper.height, true);
                    if (DEBUG) {
                        Slog.v(TAG, "Final extract:");
                        Slog.v(TAG, "  dims: w=" + wallpaper.width + " h=" + wallpaper.height);
                        Slog.v(TAG, "   out: w=" + finalCrop.getWidth() + " h=" + finalCrop.getHeight());
                    }
                    f = new FileOutputStream(wallpaper.cropFile);
                    bos = new BufferedOutputStream(f, 32 * 1024);
                    finalCrop.compress(Bitmap.CompressFormat.JPEG, 100, bos);
                    // don't rely on the implicit flush-at-close when noting success
                    bos.flush();
                    success = true;
                }
            } catch (Exception e) {
                if (DEBUG) {
                    Slog.e(TAG, "Error decoding crop", e);
                }
            } finally {
                IoUtils.closeQuietly(bos);
                IoUtils.closeQuietly(f);
            }
        }
    }
    if (!success) {
        Slog.e(TAG, "Unable to apply new wallpaper");
        wallpaper.cropFile.delete();
    }
    if (wallpaper.cropFile.exists()) {
        boolean didRestorecon = SELinux.restorecon(wallpaper.cropFile.getAbsoluteFile());
        if (DEBUG) {
            Slog.v(TAG, "restorecon() of crop file returned " + didRestorecon);
        }
    }
}

Example 22 with BitmapRegionDecoder

use of android.graphics.BitmapRegionDecoder in project android_frameworks_base by crdroidandroid.

the class WallpaperManager method getBuiltInDrawable.

/**
     * Returns a drawable for the built-in static wallpaper of the specified type.  Based on the
     * parameters, the drawable can be cropped and scaled.
     *
     * @param outWidth The width of the returned drawable
     * @param outWidth The height of the returned drawable
     * @param scaleToFit If true, scale the wallpaper down rather than just cropping it
     * @param horizontalAlignment A float value between 0 and 1 specifying where to crop the image;
     *        0 for left-aligned, 0.5 for horizontal center-aligned, and 1 for right-aligned
     * @param verticalAlignment A float value between 0 and 1 specifying where to crop the image;
     *        0 for top-aligned, 0.5 for vertical center-aligned, and 1 for bottom-aligned
     * @param which The {@code FLAG_*} identifier of a valid wallpaper type.  Throws
     *     IllegalArgumentException if an invalid wallpaper is requested.
     * @return A Drawable presenting the built-in default wallpaper image of the given type,
     *        or {@code null} if no default image of that type is defined on this device.
     */
public Drawable getBuiltInDrawable(int outWidth, int outHeight, boolean scaleToFit, float horizontalAlignment, float verticalAlignment, @SetWallpaperFlags int which) {
    if (sGlobals.mService == null) {
        Log.w(TAG, "WallpaperService not running");
        throw new RuntimeException(new DeadSystemException());
    }
    if (which != FLAG_SYSTEM && which != FLAG_LOCK) {
        throw new IllegalArgumentException("Must request exactly one kind of wallpaper");
    }
    Resources resources = mContext.getResources();
    horizontalAlignment = Math.max(0, Math.min(1, horizontalAlignment));
    verticalAlignment = Math.max(0, Math.min(1, verticalAlignment));
    InputStream wpStream = openDefaultWallpaper(mContext, which);
    if (wpStream == null) {
        if (DEBUG) {
            Log.w(TAG, "default wallpaper stream " + which + " is null");
        }
        return null;
    } else {
        InputStream is = new BufferedInputStream(wpStream);
        if (outWidth <= 0 || outHeight <= 0) {
            Bitmap fullSize = BitmapFactory.decodeStream(is, null, null);
            return new BitmapDrawable(resources, fullSize);
        } else {
            int inWidth;
            int inHeight;
            // Just measure this time through...
            {
                BitmapFactory.Options options = new BitmapFactory.Options();
                options.inJustDecodeBounds = true;
                BitmapFactory.decodeStream(is, null, options);
                if (options.outWidth != 0 && options.outHeight != 0) {
                    inWidth = options.outWidth;
                    inHeight = options.outHeight;
                } else {
                    Log.e(TAG, "default wallpaper dimensions are 0");
                    return null;
                }
            }
            // Reopen the stream to do the full decode.  We know at this point
            // that openDefaultWallpaper() will return non-null.
            is = new BufferedInputStream(openDefaultWallpaper(mContext, which));
            RectF cropRectF;
            outWidth = Math.min(inWidth, outWidth);
            outHeight = Math.min(inHeight, outHeight);
            if (scaleToFit) {
                cropRectF = getMaxCropRect(inWidth, inHeight, outWidth, outHeight, horizontalAlignment, verticalAlignment);
            } else {
                float left = (inWidth - outWidth) * horizontalAlignment;
                float right = left + outWidth;
                float top = (inHeight - outHeight) * verticalAlignment;
                float bottom = top + outHeight;
                cropRectF = new RectF(left, top, right, bottom);
            }
            Rect roundedTrueCrop = new Rect();
            cropRectF.roundOut(roundedTrueCrop);
            if (roundedTrueCrop.width() <= 0 || roundedTrueCrop.height() <= 0) {
                Log.w(TAG, "crop has bad values for full size image");
                return null;
            }
            // See how much we're reducing the size of the image
            int scaleDownSampleSize = Math.min(roundedTrueCrop.width() / outWidth, roundedTrueCrop.height() / outHeight);
            // Attempt to open a region decoder
            BitmapRegionDecoder decoder = null;
            try {
                decoder = BitmapRegionDecoder.newInstance(is, true);
            } catch (IOException e) {
                Log.w(TAG, "cannot open region decoder for default wallpaper");
            }
            Bitmap crop = null;
            if (decoder != null) {
                // Do region decoding to get crop bitmap
                BitmapFactory.Options options = new BitmapFactory.Options();
                if (scaleDownSampleSize > 1) {
                    options.inSampleSize = scaleDownSampleSize;
                }
                crop = decoder.decodeRegion(roundedTrueCrop, options);
                decoder.recycle();
            }
            if (crop == null) {
                // BitmapRegionDecoder has failed, try to crop in-memory. We know at
                // this point that openDefaultWallpaper() will return non-null.
                is = new BufferedInputStream(openDefaultWallpaper(mContext, which));
                Bitmap fullSize = null;
                BitmapFactory.Options options = new BitmapFactory.Options();
                if (scaleDownSampleSize > 1) {
                    options.inSampleSize = scaleDownSampleSize;
                }
                fullSize = BitmapFactory.decodeStream(is, null, options);
                if (fullSize != null) {
                    crop = Bitmap.createBitmap(fullSize, roundedTrueCrop.left, roundedTrueCrop.top, roundedTrueCrop.width(), roundedTrueCrop.height());
                }
            }
            if (crop == null) {
                Log.w(TAG, "cannot decode default wallpaper");
                return null;
            }
            // Scale down if necessary
            if (outWidth > 0 && outHeight > 0 && (crop.getWidth() != outWidth || crop.getHeight() != outHeight)) {
                Matrix m = new Matrix();
                RectF cropRect = new RectF(0, 0, crop.getWidth(), crop.getHeight());
                RectF returnRect = new RectF(0, 0, outWidth, outHeight);
                m.setRectToRect(cropRect, returnRect, Matrix.ScaleToFit.FILL);
                Bitmap tmp = Bitmap.createBitmap((int) returnRect.width(), (int) returnRect.height(), Bitmap.Config.ARGB_8888);
                if (tmp != null) {
                    Canvas c = new Canvas(tmp);
                    Paint p = new Paint();
                    p.setFilterBitmap(true);
                    c.drawBitmap(crop, m, p);
                    crop = tmp;
                }
            }
            return new BitmapDrawable(resources, crop);
        }
    }
}