add ColorTintDrawable

README.md

@@ -26,6 +26,7 @@ Contents
  - [PathParcelable](de/slowpoke/androidtank/graphics/PathParcelable.java): a `android.graphics.Path` that implements `Parcelable`
 * [Drawable](de/slowpoke/androidtank/graphics/drawable)
  - [CircleCutOutColorDrawable](de/slowpoke/androidtank/graphics/drawable/CircleCutOutColorDrawable.java): a `Drawable` that draws a color and leaves out a definable circle
+ - [ColorTintDrawable](de/slowpoke/androidtank/graphics/drawable/ColorTintDrawable.java): a `Drawable` that applies a color tint to another drawable
  - [RotatedDrawable](de/slowpoke/androidtank/graphics/drawable/RotatedDrawable.java): a `Drawable` that can be programmatically rotated
 
 

library/src/main/java/de/slowpoke/androidtank/graphics/drawable/ColorTintDrawable.java

@@ -0,0 +1,115 @@
+/*
+ * Copyright 2015 Brian Hoffmann, slowpoke.de
+ *
+ * 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 de.slowpoke.androidtank.graphics.drawable;
+
+import android.content.res.Resources;
+import android.graphics.Canvas;
+import android.graphics.ColorFilter;
+import android.graphics.PixelFormat;
+import android.graphics.PorterDuff;
+import android.graphics.PorterDuffColorFilter;
+import android.graphics.Rect;
+import android.graphics.drawable.Drawable;
+import android.support.annotation.ColorRes;
+
+/**
+ * A Drawable that tints another drawable.
+ */
+public class ColorTintDrawable extends Drawable {
+
+    private final ColorTintState mState;
+
+    public ColorTintDrawable(Resources res, Drawable drawable, @ColorRes int colorTint) {
+        this(drawable, res.getColor(colorTint));
+    }
+
+    public ColorTintDrawable(Drawable drawable, int colorTint) {
+        this(null);
+        mState.mDrawable = drawable.mutate();
+        mState.mColorFilter = new PorterDuffColorFilter(colorTint, PorterDuff.Mode.SRC_IN);
+        mState.mDrawable.setColorFilter(mState.mColorFilter);
+    }
+
+    private ColorTintDrawable(ColorTintState state) {
+        mState = new ColorTintState(state);
+    }
+
+    @Override
+    public int getIntrinsicWidth() {
+        return mState.mDrawable.getIntrinsicWidth();
+    }
+
+    @Override
+    public int getIntrinsicHeight() {
+        return mState.mDrawable.getIntrinsicHeight();
+    }
+
+    @Override
+    protected void onBoundsChange(Rect bounds) {
+        mState.mDrawable.setBounds(bounds);
+    }
+
+    @Override
+    public void draw(Canvas canvas) {
+        mState.mDrawable.draw(canvas);
+    }
+
+    @Override
+    public void setAlpha(int alpha) {
+        mState.mDrawable.setAlpha(alpha);
+        invalidateSelf();
+    }
+
+    @Override
+    public void setColorFilter(ColorFilter cf) {
+        mState.mColorFilter = cf;
+        invalidateSelf();
+    }
+
+    @Override
+    public int getOpacity() {
+        return PixelFormat.TRANSLUCENT;
+    }
+
+    @Override
+    public ConstantState getConstantState() {
+        return mState;
+    }
+
+    private static final class ColorTintState extends ConstantState {
+
+        Drawable mDrawable;
+        ColorFilter mColorFilter;
+
+        ColorTintState(ColorTintState orig) {
+            if (orig != null) {
+                mDrawable = orig.mDrawable;
+                mColorFilter = orig.mColorFilter;
+            }
+        }
+
+        @Override
+        public Drawable newDrawable() {
+            return new ColorTintDrawable(this);
+        }
+
+        @Override
+        public int getChangingConfigurations() {
+            return 0;
+        }
+    }
+}