1 files changed, 290 insertions, 0 deletions
diff --git a/mobile/android/geckoview/src/main/java/org/mozilla/gecko/gfx/BitmapUtils.java b/mobile/android/geckoview/src/main/java/org/mozilla/gecko/gfx/BitmapUtils.java
new file mode 100644
index 000000000..a4b516519
--- /dev/null
+++ b/mobile/android/geckoview/src/main/java/org/mozilla/gecko/gfx/BitmapUtils.java
@@ -0,0 +1,290 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.gfx;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.MalformedURLException;
+import java.net.URL;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.drawable.BitmapDrawable;
+import android.graphics.drawable.Drawable;
+import android.net.Uri;
+import android.util.Base64;
+import android.util.Log;
+
+public final class BitmapUtils {
+    private static final String LOGTAG = "GeckoBitmapUtils";
+
+    private BitmapUtils() {}
+
+    public static Bitmap decodeByteArray(byte[] bytes) {
+        return decodeByteArray(bytes, null);
+    }
+
+    public static Bitmap decodeByteArray(byte[] bytes, BitmapFactory.Options options) {
+        return decodeByteArray(bytes, 0, bytes.length, options);
+    }
+
+    public static Bitmap decodeByteArray(byte[] bytes, int offset, int length) {
+        return decodeByteArray(bytes, offset, length, null);
+    }
+
+    public static Bitmap decodeByteArray(byte[] bytes, int offset, int length, BitmapFactory.Options options) {
+        if (bytes.length <= 0) {
+            throw new IllegalArgumentException("bytes.length " + bytes.length
+                                               + " must be a positive number");
+        }
+
+        Bitmap bitmap = null;
+        try {
+            bitmap = BitmapFactory.decodeByteArray(bytes, offset, length, options);
+        } catch (OutOfMemoryError e) {
+            Log.e(LOGTAG, "decodeByteArray(bytes.length=" + bytes.length
+                          + ", options= " + options + ") OOM!", e);
+            return null;
+        }
+
+        if (bitmap == null) {
+            Log.w(LOGTAG, "decodeByteArray() returning null because BitmapFactory returned null");
+            return null;
+        }
+
+        if (bitmap.getWidth() <= 0 || bitmap.getHeight() <= 0) {
+            Log.w(LOGTAG, "decodeByteArray() returning null because BitmapFactory returned "
+                          + "a bitmap with dimensions " + bitmap.getWidth()
+                          + "x" + bitmap.getHeight());
+            return null;
+        }
+
+        return bitmap;
+    }
+
+    public static Bitmap decodeStream(InputStream inputStream) {
+        try {
+            return BitmapFactory.decodeStream(inputStream);
+        } catch (OutOfMemoryError e) {
+            Log.e(LOGTAG, "decodeStream() OOM!", e);
+            return null;
+        }
+    }
+
+    public static Bitmap decodeUrl(Uri uri) {
+        return decodeUrl(uri.toString());
+    }
+
+    public static Bitmap decodeUrl(String urlString) {
+        URL url;
+
+        try {
+            url = new URL(urlString);
+        } catch (MalformedURLException e) {
+            Log.w(LOGTAG, "decodeUrl: malformed URL " + urlString);
+            return null;
+        }
+
+        return decodeUrl(url);
+    }
+
+    public static Bitmap decodeUrl(URL url) {
+        InputStream stream = null;
+
+        try {
+            stream = url.openStream();
+        } catch (IOException e) {
+            Log.w(LOGTAG, "decodeUrl: IOException downloading " + url);
+            return null;
+        }
+
+        if (stream == null) {
+            Log.w(LOGTAG, "decodeUrl: stream not found downloading " + url);
+            return null;
+        }
+
+        Bitmap bitmap = decodeStream(stream);
+
+        try {
+            stream.close();
+        } catch (IOException e) {
+            Log.w(LOGTAG, "decodeUrl: IOException closing stream " + url, e);
+        }
+
+        return bitmap;
+    }
+
+    public static Bitmap decodeResource(Context context, int id) {
+        return decodeResource(context, id, null);
+    }
+
+    public static Bitmap decodeResource(Context context, int id, BitmapFactory.Options options) {
+        Resources resources = context.getResources();
+        try {
+            return BitmapFactory.decodeResource(resources, id, options);
+        } catch (OutOfMemoryError e) {
+            Log.e(LOGTAG, "decodeResource() OOM! Resource id=" + id, e);
+            return null;
+        }
+    }
+
+    public static int getDominantColor(Bitmap source) {
+        return getDominantColor(source, true);
+    }
+
+    public static int getDominantColor(Bitmap source, boolean applyThreshold) {
+      if (source == null)
+        return Color.argb(255, 255, 255, 255);
+
+      // Keep track of how many times a hue in a given bin appears in the image.
+      // Hue values range [0 .. 360), so dividing by 10, we get 36 bins.
+      int[] colorBins = new int[36];
+
+      // The bin with the most colors. Initialize to -1 to prevent accidentally
+      // thinking the first bin holds the dominant color.
+      int maxBin = -1;
+
+      // Keep track of sum hue/saturation/value per hue bin, which we'll use to
+      // compute an average to for the dominant color.
+      float[] sumHue = new float[36];
+      float[] sumSat = new float[36];
+      float[] sumVal = new float[36];
+      float[] hsv = new float[3];
+
+      int height = source.getHeight();
+      int width = source.getWidth();
+      int[] pixels = new int[width * height];
+      source.getPixels(pixels, 0, width, 0, 0, width, height);
+      for (int row = 0; row < height; row++) {
+        for (int col = 0; col < width; col++) {
+          int c = pixels[col + row * width];
+          // Ignore pixels with a certain transparency.
+          if (Color.alpha(c) < 128)
+            continue;
+
+          Color.colorToHSV(c, hsv);
+
+          // If a threshold is applied, ignore arbitrarily chosen values for "white" and "black".
+          if (applyThreshold && (hsv[1] <= 0.35f || hsv[2] <= 0.35f))
+            continue;
+
+          // We compute the dominant color by putting colors in bins based on their hue.
+          int bin = (int) Math.floor(hsv[0] / 10.0f);
+
+          // Update the sum hue/saturation/value for this bin.
+          sumHue[bin] = sumHue[bin] + hsv[0];
+          sumSat[bin] = sumSat[bin] + hsv[1];
+          sumVal[bin] = sumVal[bin] + hsv[2];
+
+          // Increment the number of colors in this bin.
+          colorBins[bin]++;
+
+          // Keep track of the bin that holds the most colors.
+          if (maxBin < 0 || colorBins[bin] > colorBins[maxBin])
+            maxBin = bin;
+        }
+      }
+
+      // maxBin may never get updated if the image holds only transparent and/or black/white pixels.
+      if (maxBin < 0)
+        return Color.argb(255, 255, 255, 255);
+
+      // Return a color with the average hue/saturation/value of the bin with the most colors.
+      hsv[0] = sumHue[maxBin] / colorBins[maxBin];
+      hsv[1] = sumSat[maxBin] / colorBins[maxBin];
+      hsv[2] = sumVal[maxBin] / colorBins[maxBin];
+      return Color.HSVToColor(hsv);
+    }
+
+    /**
+     * Decodes a bitmap from a Base64 data URI.
+     *
+     * @param dataURI a Base64-encoded data URI string
+     * @return        the decoded bitmap, or null if the data URI is invalid
+     */
+    public static Bitmap getBitmapFromDataURI(String dataURI) {
+        if (dataURI == null) {
+            return null;
+        }
+
+        byte[] raw = getBytesFromDataURI(dataURI);
+        if (raw == null || raw.length == 0) {
+            return null;
+        }
+
+        return decodeByteArray(raw);
+    }
+
+    /**
+     * Return a byte[] containing the bytes in a given base64 string, or null if this is not a valid
+     * base64 string.
+     */
+    public static byte[] getBytesFromBase64(String base64) {
+        try {
+            return Base64.decode(base64, Base64.DEFAULT);
+        } catch (Exception e) {
+            Log.e(LOGTAG, "exception decoding bitmap from data URI: " + base64, e);
+        }
+
+        return null;
+    }
+
+    public static byte[] getBytesFromDataURI(String dataURI) {
+        final String base64 = dataURI.substring(dataURI.indexOf(',') + 1);
+        return getBytesFromBase64(base64);
+    }
+
+    public static Bitmap getBitmapFromDrawable(Drawable drawable) {
+        if (drawable instanceof BitmapDrawable) {
+            return ((BitmapDrawable) drawable).getBitmap();
+        }
+
+        int width = drawable.getIntrinsicWidth();
+        width = width > 0 ? width : 1;
+        int height = drawable.getIntrinsicHeight();
+        height = height > 0 ? height : 1;
+
+        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
+        Canvas canvas = new Canvas(bitmap);
+        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
+        drawable.draw(canvas);
+
+        return bitmap;
+    }
+
+    public static int getResource(final Context context, final Uri resourceUrl) {
+        final String scheme = resourceUrl.getScheme();
+        if (!"drawable".equals(scheme)) {
+            // Return a "not found" default icon that's easy to spot.
+            return android.R.drawable.sym_def_app_icon;
+        }
+
+        String resource = resourceUrl.getSchemeSpecificPart();
+        if (resource.startsWith("//")) {
+            resource = resource.substring(2);
+        }
+
+        final Resources res = context.getResources();
+        int id = res.getIdentifier(resource, "drawable", context.getPackageName());
+        if (id != 0) {
+            return id;
+        }
+
+        // For backwards compatibility, we also search in system resources.
+        id = res.getIdentifier(resource, "drawable", "android");
+        if (id != 0) {
+            return id;
+        }
+
+        Log.w(LOGTAG, "Cannot find drawable/" + resource);
+        // Return a "not found" default icon that's easy to spot.
+        return android.R.drawable.sym_def_app_icon;
+    }
+}