change package name to uiuios

iconloaderlib/src/com/android/uiuios/icons/ShadowGenerator.java

@@ -0,0 +1,170 @@
+/*
+ * Copyright (C) 2016 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.uiuios.icons;
+
+import static com.android.uiuios.icons.GraphicsUtils.setColorAlphaBound;
+
+import android.graphics.Bitmap;
+import android.graphics.Bitmap.Config;
+import android.graphics.BlurMaskFilter;
+import android.graphics.BlurMaskFilter.Blur;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.PorterDuff;
+import android.graphics.PorterDuffXfermode;
+import android.graphics.RectF;
+
+/**
+ * Utility class to add shadows to bitmaps.
+ */
+public class ShadowGenerator {
+    public static final float BLUR_FACTOR = 0.5f/48;
+
+    // Percent of actual icon size
+    public static final float KEY_SHADOW_DISTANCE = 1f/48;
+    private static final int KEY_SHADOW_ALPHA = 61;
+    // Percent of actual icon size
+    private static final float HALF_DISTANCE = 0.5f;
+    private static final int AMBIENT_SHADOW_ALPHA = 30;
+
+    private final int mIconSize;
+
+    private final Paint mBlurPaint;
+    private final Paint mDrawPaint;
+    private final BlurMaskFilter mDefaultBlurMaskFilter;
+
+    public ShadowGenerator(int iconSize) {
+        mIconSize = iconSize;
+        mBlurPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
+        mDrawPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
+        mDefaultBlurMaskFilter = new BlurMaskFilter(mIconSize * BLUR_FACTOR, Blur.NORMAL);
+    }
+
+    public synchronized void recreateIcon(Bitmap icon, Canvas out) {
+        recreateIcon(icon, mDefaultBlurMaskFilter, AMBIENT_SHADOW_ALPHA, KEY_SHADOW_ALPHA, out);
+    }
+
+    public synchronized void recreateIcon(Bitmap icon, BlurMaskFilter blurMaskFilter,
+            int ambientAlpha, int keyAlpha, Canvas out) {
+        int[] offset = new int[2];
+        mBlurPaint.setMaskFilter(blurMaskFilter);
+        Bitmap shadow = icon.extractAlpha(mBlurPaint, offset);
+
+        // Draw ambient shadow
+        mDrawPaint.setAlpha(ambientAlpha);
+        out.drawBitmap(shadow, offset[0], offset[1], mDrawPaint);
+
+        // Draw key shadow
+        mDrawPaint.setAlpha(keyAlpha);
+        out.drawBitmap(shadow, offset[0], offset[1] + KEY_SHADOW_DISTANCE * mIconSize, mDrawPaint);
+
+        // Draw the icon
+        mDrawPaint.setAlpha(255);
+        out.drawBitmap(icon, 0, 0, mDrawPaint);
+    }
+
+    /**
+     * Returns the minimum amount by which an icon with {@param bounds} should be scaled
+     * so that the shadows do not get clipped.
+     */
+    public static float getScaleForBounds(RectF bounds) {
+        float scale = 1;
+
+        // For top, left & right, we need same space.
+        float minSide = Math.min(Math.min(bounds.left, bounds.right), bounds.top);
+        if (minSide < BLUR_FACTOR) {
+            scale = (HALF_DISTANCE - BLUR_FACTOR) / (HALF_DISTANCE - minSide);
+        }
+
+        float bottomSpace = BLUR_FACTOR + KEY_SHADOW_DISTANCE;
+        if (bounds.bottom < bottomSpace) {
+            scale = Math.min(scale, (HALF_DISTANCE - bottomSpace) / (HALF_DISTANCE - bounds.bottom));
+        }
+        return scale;
+    }
+
+    public static class Builder {
+
+        public final RectF bounds = new RectF();
+        public final int color;
+
+        public int ambientShadowAlpha = AMBIENT_SHADOW_ALPHA;
+
+        public float shadowBlur;
+
+        public float keyShadowDistance;
+        public int keyShadowAlpha = KEY_SHADOW_ALPHA;
+        public float radius;
+
+        public Builder(int color) {
+            this.color = color;
+        }
+
+        public Builder setupBlurForSize(int height) {
+            shadowBlur = height * 1f / 24;
+            keyShadowDistance = height * 1f / 16;
+            return this;
+        }
+
+        public Bitmap createPill(int width, int height) {
+            return createPill(width, height, height / 2f);
+        }
+
+        public Bitmap createPill(int width, int height, float r) {
+            radius = r;
+
+            int centerX = Math.round(width / 2f + shadowBlur);
+            int centerY = Math.round(radius + shadowBlur + keyShadowDistance);
+            int center = Math.max(centerX, centerY);
+            bounds.set(0, 0, width, height);
+            bounds.offsetTo(center - width / 2f, center - height / 2f);
+
+            int size = center * 2;
+            Bitmap result = Bitmap.createBitmap(size, size, Config.ARGB_8888);
+            drawShadow(new Canvas(result));
+            return result;
+        }
+
+        public void drawShadow(Canvas c) {
+            Paint p = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
+            p.setColor(color);
+
+            // Key shadow
+            p.setShadowLayer(shadowBlur, 0, keyShadowDistance,
+                    setColorAlphaBound(Color.BLACK, keyShadowAlpha));
+            c.drawRoundRect(bounds, radius, radius, p);
+
+            // Ambient shadow
+            p.setShadowLayer(shadowBlur, 0, 0,
+                    setColorAlphaBound(Color.BLACK, ambientShadowAlpha));
+            c.drawRoundRect(bounds, radius, radius, p);
+
+            if (Color.alpha(color) < 255) {
+                // Clear any content inside the pill-rect for translucent fill.
+                p.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
+                p.clearShadowLayer();
+                p.setColor(Color.BLACK);
+                c.drawRoundRect(bounds, radius, radius, p);
+
+                p.setXfermode(null);
+                p.setColor(color);
+                c.drawRoundRect(bounds, radius, radius, p);
+            }
+        }
+    }
+}