Index: chrome/android/java/src/org/chromium/chrome/browser/photo_picker/BitmapUtils.java |
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/photo_picker/BitmapUtils.java b/chrome/android/java/src/org/chromium/chrome/browser/photo_picker/BitmapUtils.java |
new file mode 100644 |
index 0000000000000000000000000000000000000000..f448622a203b96a98a89e8c7de336ad86435dfce |
--- /dev/null |
+++ b/chrome/android/java/src/org/chromium/chrome/browser/photo_picker/BitmapUtils.java |
@@ -0,0 +1,160 @@ |
+// Copyright 2017 The Chromium Authors. All rights reserved. |
Theresa
2017/03/31 18:05:55
Is this class being used anywhere currently?
Finnur
2017/04/03 17:30:29
Huh... You are right. Removed.
|
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+package org.chromium.chrome.browser.photo_picker; |
+ |
+import android.graphics.Bitmap; |
+import android.graphics.BitmapFactory; |
+ |
+import java.io.FileDescriptor; |
+ |
+class BitmapUtils { |
+ /** |
+ * Takes a |bitmap| and returns a square thumbnail of |width| from the center of the bitmap |
+ * specified. |
+ * @param bitmap The bitmap to adjust. |
+ * @param width The desired width. |
+ * @return The new bitmap thumbnail. |
+ */ |
+ public static Bitmap sizeBitmap(Bitmap bitmap, int width) { |
+ bitmap = ensureMinSize(bitmap, width); |
+ bitmap = cropToSquare(bitmap, width); |
+ return bitmap; |
+ } |
+ |
+ /** |
+ * Given a FileDescriptor, decodes the contents and returns a bitmap of size |width|x|width|. |
+ * @param descriptor The FileDescriptor for the file to read. |
+ * @param width The width of the bitmap to return. |
+ * @return The resulting bitmap. |
+ */ |
+ public static Bitmap decodeBitmapFromFileDescriptor(FileDescriptor descriptor, int width) { |
+ BitmapFactory.Options options = createSizingOptions(); |
+ BitmapFactory.decodeFileDescriptor(descriptor, null, options); |
+ Bitmap bitmap = BitmapFactory.decodeFileDescriptor( |
Theresa
2017/03/31 18:05:55
Why does this call decodeFileDescriptor twice? Sam
Finnur
2017/04/03 17:30:29
Because that's how the sub-sampling is implemented
|
+ descriptor, null, createDecodingOptions(options, width)); |
+ |
+ if (bitmap == null) return null; |
+ |
+ return sizeBitmap(bitmap, width); |
+ } |
+ |
+ /** |
+ * Given a file path, decodes the contents of the file and returns a bitmap of size |
+ * |width|x|width|. |
+ * @param filePath The path to the file to read. |
+ * @param width The width of the bitmap to return. |
+ * @return The resulting bitmap. |
+ */ |
+ public static Bitmap decodeBitmapFromDisk(String filePath, int width) { |
+ BitmapFactory.Options options = createSizingOptions(); |
+ BitmapFactory.decodeFile(filePath, options); |
+ Bitmap bitmap = BitmapFactory.decodeFile(filePath, createDecodingOptions(options, width)); |
+ |
+ if (bitmap == null) return null; |
+ |
+ return sizeBitmap(bitmap, width); |
+ } |
+ |
+ /** |
+ * Creates a {@link BitmapFactory#Options} object ready for size calculations. |
+ */ |
+ private static BitmapFactory.Options createSizingOptions() { |
+ BitmapFactory.Options options = new BitmapFactory.Options(); |
+ options.inJustDecodeBounds = true; |
+ return options; |
+ } |
+ |
+ /** |
+ * Converts a {@link BitmapFactory#Options} object for size calculations into a decoding options |
+ * object, with optimal decoding size specified. |
+ */ |
+ private static BitmapFactory.Options createDecodingOptions( |
+ BitmapFactory.Options sizingOptions, int width) { |
+ sizingOptions.inSampleSize = calculateInSampleSize(sizingOptions, width, width); |
+ sizingOptions.inJustDecodeBounds = false; |
+ return sizingOptions; |
+ } |
+ |
+ /** |
+ * Calculates the sub-sampling factor {@link BitmapFactory#inSampleSize} option for a given |
+ * bitmap option, which will be used to create a bitmap of a pre-determined size (no larger than |
+ * |width| and |height|). |
+ * @param options The bitmap options to consider. |
+ * @param width The requested width. |
+ * @param height The requested height. |
+ * @return The sub-sampling factor (1 = no change, 2 = half-size, etc). |
+ */ |
+ private static int calculateInSampleSize(BitmapFactory.Options options, int width, int height) { |
+ int inSampleSize = 1; |
+ |
+ if (options.outHeight > height || options.outWidth > width) { |
+ final int halfHeight = options.outHeight / 2; |
+ final int halfWidth = options.outWidth / 2; |
+ |
+ while ((halfHeight / inSampleSize) >= height || (halfWidth / inSampleSize) >= width) { |
+ inSampleSize *= 2; |
+ } |
+ } |
+ |
+ return inSampleSize; |
+ } |
+ |
+ /** |
+ * Scales a |bitmap| to a certain size. |
+ * @param bitmap The bitmap to scale. |
+ * @param scaleMaxSize What to scale it to. |
+ * @param filter True if the source should be filtered. |
+ * @return The resulting scaled bitmap. |
+ */ |
+ public static Bitmap scale(Bitmap bitmap, float scaleMaxSize, boolean filter) { |
+ float ratio = Math.min((float) scaleMaxSize / bitmap.getWidth(), |
+ (float) scaleMaxSize / bitmap.getHeight()); |
+ int height = Math.round(ratio * bitmap.getHeight()); |
+ int width = Math.round(ratio * bitmap.getWidth()); |
+ |
+ return Bitmap.createScaledBitmap(bitmap, width, height, filter); |
+ } |
+ |
+ /** |
+ * Ensures a |bitmap| is at least |size| in both width and height. |
+ * @param bitmap The bitmap to modify. |
+ * @param size The minimum size (width and height). |
+ * @return The resulting (scaled) bitmap. |
+ */ |
+ private static Bitmap ensureMinSize(Bitmap bitmap, int size) { |
+ int width = bitmap.getWidth(); |
+ int height = bitmap.getHeight(); |
+ if (width < size) { |
+ float scale = (float) size / width; |
+ width = size; |
+ height *= scale; |
+ } |
+ |
+ if (height < size) { |
+ float scale = (float) size / height; |
+ height = size; |
+ width *= scale; |
+ } |
+ |
+ return Bitmap.createScaledBitmap(bitmap, width, height, true); |
+ } |
+ |
+ /** |
+ * Crops a |bitmap| to a certain square |size| |
+ * @param bitmap The bitmap to crop. |
+ * @param size The size desired (width and height). |
+ * @return The resulting (square) bitmap. |
+ */ |
+ private static Bitmap cropToSquare(Bitmap bitmap, int size) { |
+ int x = 0; |
+ int y = 0; |
+ int width = bitmap.getWidth(); |
+ int height = bitmap.getHeight(); |
+ |
+ if (width > size) x = (width - size) / 2; |
+ if (height > size) y = (height - size) / 2; |
+ return Bitmap.createBitmap(bitmap, x, y, size, size); |
+ } |
+} |