Launcher2 is now Launcher3.

Changes include
  - moving from com.android.launcher{,2} to
    com.android.launcher3
  - removing wallpapers
  - new temporary icon

Change-Id: I1eabd06059e94a8f3bdf6b620777bd1d2b7c212b
diff --git a/src/com/android/launcher3/HolographicOutlineHelper.java b/src/com/android/launcher3/HolographicOutlineHelper.java
new file mode 100644
index 0000000..2decc3d
--- /dev/null
+++ b/src/com/android/launcher3/HolographicOutlineHelper.java
@@ -0,0 +1,221 @@
+/*
+ * 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.launcher3;
+
+import android.graphics.Bitmap;
+import android.graphics.BlurMaskFilter;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.PorterDuff;
+import android.graphics.PorterDuffXfermode;
+
+public class HolographicOutlineHelper {
+    private final Paint mHolographicPaint = new Paint();
+    private final Paint mBlurPaint = new Paint();
+    private final Paint mErasePaint = new Paint();
+
+    public static final int MAX_OUTER_BLUR_RADIUS;
+    public static final int MIN_OUTER_BLUR_RADIUS;
+
+    private static final BlurMaskFilter sExtraThickOuterBlurMaskFilter;
+    private static final BlurMaskFilter sThickOuterBlurMaskFilter;
+    private static final BlurMaskFilter sMediumOuterBlurMaskFilter;
+    private static final BlurMaskFilter sThinOuterBlurMaskFilter;
+    private static final BlurMaskFilter sThickInnerBlurMaskFilter;
+    private static final BlurMaskFilter sExtraThickInnerBlurMaskFilter;
+    private static final BlurMaskFilter sMediumInnerBlurMaskFilter;
+
+    private static final int THICK = 0;
+    private static final int MEDIUM = 1;
+    private static final int EXTRA_THICK = 2;
+
+    static {
+        final float scale = LauncherApplication.getScreenDensity();
+
+        MIN_OUTER_BLUR_RADIUS = (int) (scale * 1.0f);
+        MAX_OUTER_BLUR_RADIUS = (int) (scale * 12.0f);
+
+        sExtraThickOuterBlurMaskFilter = new BlurMaskFilter(scale * 12.0f, BlurMaskFilter.Blur.OUTER);
+        sThickOuterBlurMaskFilter = new BlurMaskFilter(scale * 6.0f, BlurMaskFilter.Blur.OUTER);
+        sMediumOuterBlurMaskFilter = new BlurMaskFilter(scale * 2.0f, BlurMaskFilter.Blur.OUTER);
+        sThinOuterBlurMaskFilter = new BlurMaskFilter(scale * 1.0f, BlurMaskFilter.Blur.OUTER);
+        sExtraThickInnerBlurMaskFilter = new BlurMaskFilter(scale * 6.0f, BlurMaskFilter.Blur.NORMAL);
+        sThickInnerBlurMaskFilter = new BlurMaskFilter(scale * 4.0f, BlurMaskFilter.Blur.NORMAL);
+        sMediumInnerBlurMaskFilter = new BlurMaskFilter(scale * 2.0f, BlurMaskFilter.Blur.NORMAL);
+    }
+
+    HolographicOutlineHelper() {
+        mHolographicPaint.setFilterBitmap(true);
+        mHolographicPaint.setAntiAlias(true);
+        mBlurPaint.setFilterBitmap(true);
+        mBlurPaint.setAntiAlias(true);
+        mErasePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
+        mErasePaint.setFilterBitmap(true);
+        mErasePaint.setAntiAlias(true);
+    }
+
+    /**
+     * Returns the interpolated holographic highlight alpha for the effect we want when scrolling
+     * pages.
+     */
+    public static float highlightAlphaInterpolator(float r) {
+        float maxAlpha = 0.6f;
+        return (float) Math.pow(maxAlpha * (1.0f - r), 1.5f);
+    }
+
+    /**
+     * Returns the interpolated view alpha for the effect we want when scrolling pages.
+     */
+    public static float viewAlphaInterpolator(float r) {
+        final float pivot = 0.95f;
+        if (r < pivot) {
+            return (float) Math.pow(r / pivot, 1.5f);
+        } else {
+            return 1.0f;
+        }
+    }
+
+    /**
+     * Applies a more expensive and accurate outline to whatever is currently drawn in a specified
+     * bitmap.
+     */
+    void applyExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas, int color,
+            int outlineColor, int thickness) {
+        applyExpensiveOutlineWithBlur(srcDst, srcDstCanvas, color, outlineColor, true,
+                thickness);
+    }
+    void applyExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas, int color,
+            int outlineColor, boolean clipAlpha, int thickness) {
+
+        // We start by removing most of the alpha channel so as to ignore shadows, and
+        // other types of partial transparency when defining the shape of the object
+        if (clipAlpha) {
+            int[] srcBuffer = new int[srcDst.getWidth() * srcDst.getHeight()];
+            srcDst.getPixels(srcBuffer,
+                    0, srcDst.getWidth(), 0, 0, srcDst.getWidth(), srcDst.getHeight());
+            for (int i = 0; i < srcBuffer.length; i++) {
+                final int alpha = srcBuffer[i] >>> 24;
+                if (alpha < 188) {
+                    srcBuffer[i] = 0;
+                }
+            }
+            srcDst.setPixels(srcBuffer,
+                    0, srcDst.getWidth(), 0, 0, srcDst.getWidth(), srcDst.getHeight());
+        }
+        Bitmap glowShape = srcDst.extractAlpha();
+
+        // calculate the outer blur first
+        BlurMaskFilter outerBlurMaskFilter;
+        switch (thickness) {
+            case EXTRA_THICK:
+                outerBlurMaskFilter = sExtraThickOuterBlurMaskFilter;
+                break;
+            case THICK:
+                outerBlurMaskFilter = sThickOuterBlurMaskFilter;
+                break;
+            case MEDIUM:
+                outerBlurMaskFilter = sMediumOuterBlurMaskFilter;
+                break;
+            default:
+                throw new RuntimeException("Invalid blur thickness");
+        }
+        mBlurPaint.setMaskFilter(outerBlurMaskFilter);
+        int[] outerBlurOffset = new int[2];
+        Bitmap thickOuterBlur = glowShape.extractAlpha(mBlurPaint, outerBlurOffset);
+        if (thickness == EXTRA_THICK) {
+            mBlurPaint.setMaskFilter(sMediumOuterBlurMaskFilter);
+        } else {
+            mBlurPaint.setMaskFilter(sThinOuterBlurMaskFilter);
+        }
+
+        int[] brightOutlineOffset = new int[2];
+        Bitmap brightOutline = glowShape.extractAlpha(mBlurPaint, brightOutlineOffset);
+
+        // calculate the inner blur
+        srcDstCanvas.setBitmap(glowShape);
+        srcDstCanvas.drawColor(0xFF000000, PorterDuff.Mode.SRC_OUT);
+        BlurMaskFilter innerBlurMaskFilter;
+        switch (thickness) {
+            case EXTRA_THICK:
+                innerBlurMaskFilter = sExtraThickInnerBlurMaskFilter;
+                break;
+            case THICK:
+                innerBlurMaskFilter = sThickInnerBlurMaskFilter;
+                break;
+            case MEDIUM:
+                innerBlurMaskFilter = sMediumInnerBlurMaskFilter;
+                break;
+            default:
+                throw new RuntimeException("Invalid blur thickness");
+        }
+        mBlurPaint.setMaskFilter(innerBlurMaskFilter);
+        int[] thickInnerBlurOffset = new int[2];
+        Bitmap thickInnerBlur = glowShape.extractAlpha(mBlurPaint, thickInnerBlurOffset);
+
+        // mask out the inner blur
+        srcDstCanvas.setBitmap(thickInnerBlur);
+        srcDstCanvas.drawBitmap(glowShape, -thickInnerBlurOffset[0],
+                -thickInnerBlurOffset[1], mErasePaint);
+        srcDstCanvas.drawRect(0, 0, -thickInnerBlurOffset[0], thickInnerBlur.getHeight(),
+                mErasePaint);
+        srcDstCanvas.drawRect(0, 0, thickInnerBlur.getWidth(), -thickInnerBlurOffset[1],
+                mErasePaint);
+
+        // draw the inner and outer blur
+        srcDstCanvas.setBitmap(srcDst);
+        srcDstCanvas.drawColor(0, PorterDuff.Mode.CLEAR);
+        mHolographicPaint.setColor(color);
+        srcDstCanvas.drawBitmap(thickInnerBlur, thickInnerBlurOffset[0], thickInnerBlurOffset[1],
+                mHolographicPaint);
+        srcDstCanvas.drawBitmap(thickOuterBlur, outerBlurOffset[0], outerBlurOffset[1],
+                mHolographicPaint);
+
+        // draw the bright outline
+        mHolographicPaint.setColor(outlineColor);
+        srcDstCanvas.drawBitmap(brightOutline, brightOutlineOffset[0], brightOutlineOffset[1],
+                mHolographicPaint);
+
+        // cleanup
+        srcDstCanvas.setBitmap(null);
+        brightOutline.recycle();
+        thickOuterBlur.recycle();
+        thickInnerBlur.recycle();
+        glowShape.recycle();
+    }
+
+    void applyExtraThickExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas, int color,
+            int outlineColor) {
+        applyExpensiveOutlineWithBlur(srcDst, srcDstCanvas, color, outlineColor, EXTRA_THICK);
+    }
+
+    void applyThickExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas, int color,
+            int outlineColor) {
+        applyExpensiveOutlineWithBlur(srcDst, srcDstCanvas, color, outlineColor, THICK);
+    }
+
+    void applyMediumExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas, int color,
+            int outlineColor, boolean clipAlpha) {
+        applyExpensiveOutlineWithBlur(srcDst, srcDstCanvas, color, outlineColor, clipAlpha,
+                MEDIUM);
+    }
+
+    void applyMediumExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas, int color,
+            int outlineColor) {
+        applyExpensiveOutlineWithBlur(srcDst, srcDstCanvas, color, outlineColor, MEDIUM);
+    }
+
+}