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Diffstat (limited to 'src/com/android/launcher/Utilities.java')
| -rw-r--r-- | src/com/android/launcher/Utilities.java | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/src/com/android/launcher/Utilities.java b/src/com/android/launcher/Utilities.java new file mode 100644 index 000000000..cb8976ca9 --- /dev/null +++ b/src/com/android/launcher/Utilities.java @@ -0,0 +1,195 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package com.android.launcher; + +import android.graphics.drawable.Drawable; +import android.graphics.drawable.PaintDrawable; +import android.graphics.Bitmap; +import android.graphics.PixelFormat; +import android.graphics.Canvas; +import android.graphics.PaintFlagsDrawFilter; +import android.graphics.Paint; +import android.graphics.Rect; +import android.content.res.Resources; +import android.content.Context; + +/** + * Various utilities shared amongst the Launcher's classes. + */ +final class Utilities { + private static int sIconWidth = -1; + private static int sIconHeight = -1; + + private static final Paint sPaint = new Paint(); + private static final Rect sBounds = new Rect(); + private static final Rect sOldBounds = new Rect(); + private static Canvas sCanvas = new Canvas(); + + static { + sCanvas.setDrawFilter(new PaintFlagsDrawFilter(Paint.DITHER_FLAG, + Paint.FILTER_BITMAP_FLAG)); + } + + static Bitmap centerToFit(Bitmap bitmap, int width, int height, Context context) { + final int bitmapWidth = bitmap.getWidth(); + final int bitmapHeight = bitmap.getHeight(); + + if (bitmapWidth < width || bitmapHeight < height) { + int color = context.getResources().getColor(R.color.window_background); + + Bitmap centered = Bitmap.createBitmap(bitmapWidth < width ? width : bitmapWidth, + bitmapHeight < height ? height : bitmapHeight, Bitmap.Config.RGB_565); + Canvas canvas = new Canvas(centered); + canvas.drawColor(color); + canvas.drawBitmap(bitmap, (width - bitmapWidth) / 2.0f, (height - bitmapHeight) / 2.0f, + null); + + bitmap = centered; + } + + return bitmap; + } + + /** + * Returns a Drawable representing the thumbnail of the specified Drawable. + * The size of the thumbnail is defined by the dimension + * android.R.dimen.launcher_application_icon_size. + * + * This method is not thread-safe and should be invoked on the UI thread only. + * + * @param icon The icon to get a thumbnail of. + * @param context The application's context. + * + * @return A thumbnail for the specified icon or the icon itself if the + * thumbnail could not be created. + */ + static Drawable createIconThumbnail(Drawable icon, Context context) { + if (sIconWidth == -1) { + final Resources resources = context.getResources(); + sIconWidth = sIconHeight = (int) resources.getDimension( + android.R.dimen.app_icon_size); + } + + int width = sIconWidth; + int height = sIconHeight; + + final int iconWidth = icon.getIntrinsicWidth(); + final int iconHeight = icon.getIntrinsicHeight(); + + if (icon instanceof PaintDrawable) { + PaintDrawable painter = (PaintDrawable) icon; + painter.setIntrinsicWidth(width); + painter.setIntrinsicHeight(height); + } + + if (width > 0 && height > 0) { + if (width < iconWidth || height < iconHeight) { + final float ratio = (float) iconWidth / iconHeight; + + if (iconWidth > iconHeight) { + height = (int) (width / ratio); + } else if (iconHeight > iconWidth) { + width = (int) (height * ratio); + } + + final Bitmap.Config c = icon.getOpacity() != PixelFormat.OPAQUE ? + Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; + final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c); + final Canvas canvas = sCanvas; + canvas.setBitmap(thumb); + // Copy the old bounds to restore them later + // If we were to do oldBounds = icon.getBounds(), + // the call to setBounds() that follows would + // change the same instance and we would lose the + // old bounds + sOldBounds.set(icon.getBounds()); + final int x = (sIconWidth - width) / 2; + final int y = (sIconHeight - height) / 2; + icon.setBounds(x, y, x + width, y + height); + icon.draw(canvas); + icon.setBounds(sOldBounds); + icon = new FastBitmapDrawable(thumb); + } else if (iconWidth < width && iconHeight < height) { + final Bitmap.Config c = Bitmap.Config.ARGB_8888; + final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c); + final Canvas canvas = sCanvas; + canvas.setBitmap(thumb); + sOldBounds.set(icon.getBounds()); + final int x = (width - iconWidth) / 2; + final int y = (height - iconHeight) / 2; + icon.setBounds(x, y, x + iconWidth, y + iconHeight); + icon.draw(canvas); + icon.setBounds(sOldBounds); + icon = new FastBitmapDrawable(thumb); + } + } + + return icon; + } + + /** + * Returns a Bitmap representing the thumbnail of the specified Bitmap. + * The size of the thumbnail is defined by the dimension + * android.R.dimen.launcher_application_icon_size. + * + * This method is not thread-safe and should be invoked on the UI thread only. + * + * @param bitmap The bitmap to get a thumbnail of. + * @param context The application's context. + * + * @return A thumbnail for the specified bitmap or the bitmap itself if the + * thumbnail could not be created. + */ + static Bitmap createBitmapThumbnail(Bitmap bitmap, Context context) { + if (sIconWidth == -1) { + final Resources resources = context.getResources(); + sIconWidth = sIconHeight = (int) resources.getDimension( + android.R.dimen.app_icon_size); + } + + int width = sIconWidth; + int height = sIconHeight; + + final int bitmapWidth = bitmap.getWidth(); + final int bitmapHeight = bitmap.getHeight(); + + if (width > 0 && height > 0 && (width < bitmapWidth || height < bitmapHeight)) { + final float ratio = (float) bitmapWidth / bitmapHeight; + + if (bitmapWidth > bitmapHeight) { + height = (int) (width / ratio); + } else if (bitmapHeight > bitmapWidth) { + width = (int) (height * ratio); + } + + final Bitmap.Config c = (width == sIconWidth && height == sIconHeight) ? + bitmap.getConfig() : Bitmap.Config.ARGB_8888; + final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c); + final Canvas canvas = sCanvas; + final Paint paint = sPaint; + canvas.setBitmap(thumb); + paint.setDither(false); + paint.setFilterBitmap(true); + sBounds.set((sIconWidth - width) / 2, (sIconHeight - height) / 2, width, height); + sOldBounds.set(0, 0, bitmapWidth, bitmapHeight); + canvas.drawBitmap(bitmap, sOldBounds, sBounds, paint); + return thumb; + } + + return bitmap; + } +} |