Moving some image handling classes to .graphics package

Change-Id: Id6d3d0b9c345a503ff2e09f073eb4b6449e21c7e

1 files changed, 229 insertions, 0 deletions

diff --git a/src/com/android/launcher3/graphics/HolographicOutlineHelper.java b/src/com/android/launcher3/graphics/HolographicOutlineHelper.java
new file mode 100644
index 000000000..0d70bdee1
--- /dev/null
+++ b/src/com/android/launcher3/graphics/HolographicOutlineHelper.java
@@ -0,0 +1,229 @@
+/*
+ * 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.graphics;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Bitmap;
+import android.graphics.BlurMaskFilter;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.PorterDuff;
+import android.graphics.PorterDuffXfermode;
+import android.graphics.Rect;
+import android.graphics.drawable.Drawable;
+import android.util.SparseArray;
+
+import com.android.launcher3.BubbleTextView;
+import com.android.launcher3.R;
+import com.android.launcher3.config.ProviderConfig;
+
+import java.nio.ByteBuffer;
+
+/**
+ * Utility class to generate shadow and outline effect, which are used for click feedback
+ * and drag-n-drop respectively.
+ */
+public class HolographicOutlineHelper {
+
+    private static HolographicOutlineHelper sInstance;
+
+    private final Canvas mCanvas = new Canvas();
+    private final Paint mDrawPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
+    private final Paint mBlurPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
+    private final Paint mErasePaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
+
+    private final BlurMaskFilter mMediumOuterBlurMaskFilter;
+    private final BlurMaskFilter mThinOuterBlurMaskFilter;
+    private final BlurMaskFilter mMediumInnerBlurMaskFilter;
+
+    private final float mShadowBitmapShift;
+    private final BlurMaskFilter mShadowBlurMaskFilter;
+
+    // We have 4 different icon sizes: homescreen, hotseat, folder & all-apps
+    private final SparseArray<Bitmap> mBitmapCache = new SparseArray<>(4);
+
+    private HolographicOutlineHelper(Context context) {
+        Resources res = context.getResources();
+
+        float mediumBlur = res.getDimension(R.dimen.blur_size_medium_outline);
+        mMediumOuterBlurMaskFilter = new BlurMaskFilter(mediumBlur, BlurMaskFilter.Blur.OUTER);
+        mMediumInnerBlurMaskFilter = new BlurMaskFilter(mediumBlur, BlurMaskFilter.Blur.NORMAL);
+
+        mThinOuterBlurMaskFilter = new BlurMaskFilter(
+                res.getDimension(R.dimen.blur_size_thin_outline), BlurMaskFilter.Blur.OUTER);
+
+        mShadowBitmapShift = res.getDimension(R.dimen.blur_size_click_shadow);
+        mShadowBlurMaskFilter = new BlurMaskFilter(mShadowBitmapShift, BlurMaskFilter.Blur.NORMAL);
+
+        mErasePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
+    }
+
+    public static HolographicOutlineHelper getInstance(Context context) {
+        if (sInstance == null) {
+            sInstance = new HolographicOutlineHelper(context.getApplicationContext());
+        }
+        return sInstance;
+    }
+
+    /**
+     * Applies a more expensive and accurate outline to whatever is currently drawn in a specified
+     * bitmap.
+     */
+    public void applyExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas) {
+        applyExpensiveOutlineWithBlur(srcDst, srcDstCanvas, true);
+    }
+
+    public void applyExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas,
+            boolean clipAlpha) {
+        if (ProviderConfig.IS_DOGFOOD_BUILD && srcDst.getConfig() != Bitmap.Config.ALPHA_8) {
+            throw new RuntimeException("Outline blue is only supported on alpha bitmaps");
+        }
+
+        // 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) {
+            byte[] pixels = new byte[srcDst.getWidth() * srcDst.getHeight()];
+            ByteBuffer buffer = ByteBuffer.wrap(pixels);
+            buffer.rewind();
+            srcDst.copyPixelsToBuffer(buffer);
+
+            for (int i = 0; i < pixels.length; i++) {
+                if ((pixels[i] & 0xFF) < 188) {
+                    pixels[i] = 0;
+                }
+            }
+
+            buffer.rewind();
+            srcDst.copyPixelsFromBuffer(buffer);
+        }
+
+        // calculate the outer blur first
+        mBlurPaint.setMaskFilter(mMediumOuterBlurMaskFilter);
+        int[] outerBlurOffset = new int[2];
+        Bitmap thickOuterBlur = srcDst.extractAlpha(mBlurPaint, outerBlurOffset);
+
+        mBlurPaint.setMaskFilter(mThinOuterBlurMaskFilter);
+        int[] brightOutlineOffset = new int[2];
+        Bitmap brightOutline = srcDst.extractAlpha(mBlurPaint, brightOutlineOffset);
+
+        // calculate the inner blur
+        srcDstCanvas.setBitmap(srcDst);
+        srcDstCanvas.drawColor(0xFF000000, PorterDuff.Mode.SRC_OUT);
+        mBlurPaint.setMaskFilter(mMediumInnerBlurMaskFilter);
+        int[] thickInnerBlurOffset = new int[2];
+        Bitmap thickInnerBlur = srcDst.extractAlpha(mBlurPaint, thickInnerBlurOffset);
+
+        // mask out the inner blur
+        srcDstCanvas.setBitmap(thickInnerBlur);
+        srcDstCanvas.drawBitmap(srcDst, -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);
+        srcDstCanvas.drawBitmap(thickInnerBlur, thickInnerBlurOffset[0], thickInnerBlurOffset[1],
+                mDrawPaint);
+        srcDstCanvas.drawBitmap(thickOuterBlur, outerBlurOffset[0], outerBlurOffset[1],
+                mDrawPaint);
+
+        // draw the bright outline
+        srcDstCanvas.drawBitmap(brightOutline, brightOutlineOffset[0], brightOutlineOffset[1],
+                mDrawPaint);
+
+        // cleanup
+        srcDstCanvas.setBitmap(null);
+        brightOutline.recycle();
+        thickOuterBlur.recycle();
+        thickInnerBlur.recycle();
+    }
+
+    public Bitmap createMediumDropShadow(BubbleTextView view) {
+        return createMediumDropShadow(view.getIcon(), view.getScaleX(), view.getScaleY(), true);
+    }
+
+    public Bitmap createMediumDropShadow(Drawable drawable, boolean shouldCache) {
+        return createMediumDropShadow(drawable, 1f, 1f, shouldCache);
+    }
+
+    Bitmap createMediumDropShadow(Drawable drawable, float scaleX, float scaleY,
+                boolean shouldCache) {
+        if (drawable == null) {
+            return null;
+        }
+        Rect rect = drawable.getBounds();
+
+        int bitmapWidth = (int) (rect.width() * scaleX);
+        int bitmapHeight = (int) (rect.height() * scaleY);
+        if (bitmapHeight <= 0 || bitmapWidth <= 0) {
+            return null;
+        }
+
+        int key = (bitmapWidth << 16) | bitmapHeight;
+        Bitmap cache = shouldCache ? mBitmapCache.get(key) : null;
+        if (cache == null) {
+            cache = Bitmap.createBitmap(bitmapWidth, bitmapHeight, Bitmap.Config.ALPHA_8);
+            mCanvas.setBitmap(cache);
+
+            if (shouldCache) {
+                mBitmapCache.put(key, cache);
+            }
+        } else {
+            mCanvas.setBitmap(cache);
+            mCanvas.drawColor(Color.BLACK, PorterDuff.Mode.CLEAR);
+        }
+
+        int saveCount = mCanvas.save();
+        mCanvas.scale(scaleX, scaleY);
+        mCanvas.translate(-rect.left, -rect.top);
+        drawable.draw(mCanvas);
+        mCanvas.restoreToCount(saveCount);
+        mCanvas.setBitmap(null);
+
+        mBlurPaint.setMaskFilter(mShadowBlurMaskFilter);
+
+        int extraSize = (int) (2 * mShadowBitmapShift);
+
+        int resultWidth = bitmapWidth + extraSize;
+        int resultHeight = bitmapHeight + extraSize;
+        key = (resultWidth << 16) | resultHeight;
+        Bitmap result = shouldCache ? mBitmapCache.get(key) : null;
+        if (result == null) {
+            result = Bitmap.createBitmap(resultWidth, resultHeight, Bitmap.Config.ALPHA_8);
+            mCanvas.setBitmap(result);
+        } else {
+            // Use put instead of delete, to avoid unnecessary shrinking of cache array
+            mBitmapCache.put(key, null);
+            mCanvas.setBitmap(result);
+            mCanvas.drawColor(Color.BLACK, PorterDuff.Mode.CLEAR);
+        }
+        mCanvas.drawBitmap(cache, mShadowBitmapShift, mShadowBitmapShift, mBlurPaint);
+        mCanvas.setBitmap(null);
+        return result;
+    }
+
+    public void recycleShadowBitmap(Bitmap bitmap) {
+        if (bitmap != null) {
+            mBitmapCache.put((bitmap.getWidth() << 16) | bitmap.getHeight(), bitmap);
+        }
+    }
+}