src/com/android/mail/bitmap/ContactDrawable.java - platform/packages/apps/UnifiedEmail - Git at Google

 /*
  * Copyright (C) 2013 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.mail.bitmap;

 import android.content.res.Resources;
 import android.content.res.TypedArray;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.graphics.Canvas;
 import android.graphics.ColorFilter;
 import android.graphics.Paint;
 import android.graphics.Paint.Align;
 import android.graphics.Rect;
 import android.graphics.Typeface;
 import android.graphics.drawable.Drawable;

 import com.android.bitmap.BitmapCache;
 import com.android.bitmap.DecodeTask.Request;
 import com.android.bitmap.ReusableBitmap;
 import com.android.mail.R;

 /**
  * A drawable that encapsulates all the functionality needed to display a contact image,
  * including request creation/cancelling and data unbinding/re-binding. While no contact images
  * can be shown, a default letter tile will be shown instead.
  *
  * <p/>
  * The actual contact resolving and decoding is handled by {@link ContactResolver}.
  */
 public class ContactDrawable extends Drawable {

     private final BitmapCache mCache;
     private final ContactResolver mContactResolver;

     private ContactRequest mContactRequest;
     private ReusableBitmap mBitmap;
     private final Paint mPaint;
     private int mScale;

     /** Letter tile */
     private static TypedArray sColors;
     private static int sDefaultColor;
     private static int sTileLetterFontSize;
     private static int sTileLetterFontSizeSmall;
     private static int sTileFontColor;
     private static Bitmap DEFAULT_AVATAR;
     /** Reusable components to avoid new allocations */
     private static final Paint sPaint = new Paint();
     private static final Rect sRect = new Rect();
     private static final char[] sFirstChar = new char[1];

     /** This should match the total number of colors defined in colors.xml for letter_tile_color */
     private static final int NUM_OF_TILE_COLORS = 8;

     public ContactDrawable(final Resources res, final BitmapCache cache,
             final ContactResolver contactResolver) {
         mCache = cache;
         mContactResolver = contactResolver;
         mPaint = new Paint();
         mPaint.setFilterBitmap(true);
         mPaint.setDither(true);

         if (sColors == null) {
             sColors = res.obtainTypedArray(R.array.letter_tile_colors);
             sDefaultColor = res.getColor(R.color.letter_tile_default_color);
             sTileLetterFontSize = res.getDimensionPixelSize(R.dimen.tile_letter_font_size);
             sTileLetterFontSizeSmall = res
                     .getDimensionPixelSize(R.dimen.tile_letter_font_size_small);
             sTileFontColor = res.getColor(R.color.letter_tile_font_color);
             DEFAULT_AVATAR = BitmapFactory.decodeResource(res, R.drawable.ic_generic_man);

             sPaint.setTypeface(Typeface.create("sans-serif-light", Typeface.NORMAL));
             sPaint.setTextAlign(Align.CENTER);
             sPaint.setAntiAlias(true);
         }
     }

     @Override
     public void draw(final Canvas canvas) {
         final Rect bounds = getBounds();
         if (!isVisible() || bounds.isEmpty()) {
             return;
         }

         if (mBitmap != null && mBitmap.bmp != null) {
             // Draw sender image.
             drawBitmap(mBitmap.bmp, mBitmap.getLogicalWidth(), mBitmap.getLogicalHeight(), canvas);
         } else {
             // Draw letter tile.
             drawLetterTile(canvas);
         }
     }

     /**
      * Draw the bitmap onto the canvas at the current bounds taking into account the current scale.
      */
     private void drawBitmap(final Bitmap bitmap, final int width, final int height,
             final Canvas canvas) {
         final Rect bounds = getBounds();

         if (mScale != ContactGridDrawable.SCALE_TYPE_HALF) {
             sRect.set(0, 0, width, height);
         } else {
             // For skinny bounds, draw the middle two quarters.
             sRect.set(width / 4, 0, width / 4 * 3, height);
         }
         canvas.drawBitmap(bitmap, sRect, bounds, mPaint);
     }

     private void drawLetterTile(final Canvas canvas) {
         if (mContactRequest == null) {
             return;
         }

         // Draw background color.
         final String email = mContactRequest.getEmail();
         sPaint.setColor(pickColor(email));
         sPaint.setAlpha(mPaint.getAlpha());
         canvas.drawRect(getBounds(), sPaint);

         // Draw letter/digit or generic avatar.
         final String displayName = mContactRequest.getDisplayName();
         final char firstChar = displayName.charAt(0);
         final Rect bounds = getBounds();
         if (isEnglishLetterOrDigit(firstChar)) {
             // Draw letter or digit.
             sFirstChar[0] = Character.toUpperCase(firstChar);
             sPaint.setTextSize(mScale == ContactGridDrawable.SCALE_TYPE_ONE ? sTileLetterFontSize
                     : sTileLetterFontSizeSmall);
             sPaint.getTextBounds(sFirstChar, 0, 1, sRect);
             sPaint.setColor(sTileFontColor);
             canvas.drawText(sFirstChar, 0, 1, bounds.centerX(),
                     bounds.centerY() + sRect.height() / 2, sPaint);
         } else {
             drawBitmap(DEFAULT_AVATAR, DEFAULT_AVATAR.getWidth(), DEFAULT_AVATAR.getHeight(),
                     canvas);
         }
     }

     private static int pickColor(final String email) {
         // String.hashCode() implementation is not supposed to change across java versions, so
         // this should guarantee the same email address always maps to the same color.
         // The email should already have been normalized by the ContactRequest.
         final int color = Math.abs(email.hashCode()) % NUM_OF_TILE_COLORS;
         return sColors.getColor(color, sDefaultColor);
     }

     private static boolean isEnglishLetterOrDigit(final char c) {
         return ('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z') || ('0' <= c && c <= '9');
     }

     @Override
     public void setAlpha(final int alpha) {
         mPaint.setAlpha(alpha);
     }

     @Override
     public void setColorFilter(final ColorFilter cf) {
         mPaint.setColorFilter(cf);
     }

     @Override
     public int getOpacity() {
         return 0;
     }

     public void setDecodeDimensions(final int decodeWidth, final int decodeHeight) {
         mCache.setPoolDimensions(decodeWidth, decodeHeight);
     }

     public void setScale(final int scale) {
         mScale = scale;
     }

     public void unbind() {
         setImage(null);
     }

     public void bind(final String name, final String email) {
         setImage(new ContactRequest(name, email));
     }

     private void setImage(final ContactRequest contactRequest) {
         if (mContactRequest != null && mContactRequest.equals(contactRequest)) {
             return;
         }

         if (mBitmap != null) {
             mBitmap.releaseReference();
             mBitmap = null;
         }

         mContactResolver.remove(mContactRequest, this);
         mContactRequest = contactRequest;

         if (contactRequest == null) {
             invalidateSelf();
             return;
         }

         final ReusableBitmap cached = mCache.get(contactRequest, true /* incrementRefCount */);
         if (cached != null) {
             setBitmap(cached);
         } else {
             decode();
         }
     }

     private void setBitmap(final ReusableBitmap bmp) {
         if (mBitmap != null && mBitmap != bmp) {
             mBitmap.releaseReference();
         }
         mBitmap = bmp;
         invalidateSelf();
     }

     private void decode() {
         if (mContactRequest == null) {
             return;
         }
         // Add to batch.
         mContactResolver.add(mContactRequest, this);
     }

     public void onDecodeComplete(final Request key, final ReusableBitmap result) {
         final ContactRequest request = (ContactRequest) key;
         // Remove from batch.
         mContactResolver.remove(request, this);
         if (request.equals(mContactRequest)) {
             setBitmap(result);
         } else {
             // if the requests don't match (i.e. this request is stale), decrement the
             // ref count to allow the bitmap to be pooled
             if (result != null) {
                 result.releaseReference();
             }
         }
     }
 }
	/*
	* Copyright (C) 2013 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.mail.bitmap;

	import android.content.res.Resources;
	import android.content.res.TypedArray;
	import android.graphics.Bitmap;
	import android.graphics.BitmapFactory;
	import android.graphics.Canvas;
	import android.graphics.ColorFilter;
	import android.graphics.Paint;
	import android.graphics.Paint.Align;
	import android.graphics.Rect;
	import android.graphics.Typeface;
	import android.graphics.drawable.Drawable;

	import com.android.bitmap.BitmapCache;
	import com.android.bitmap.DecodeTask.Request;
	import com.android.bitmap.ReusableBitmap;
	import com.android.mail.R;

	/**
	* A drawable that encapsulates all the functionality needed to display a contact image,
	* including request creation/cancelling and data unbinding/re-binding. While no contact images
	* can be shown, a default letter tile will be shown instead.
	*
	* <p/>
	* The actual contact resolving and decoding is handled by {@link ContactResolver}.
	*/
	public class ContactDrawable extends Drawable {

	private final BitmapCache mCache;
	private final ContactResolver mContactResolver;

	private ContactRequest mContactRequest;
	private ReusableBitmap mBitmap;
	private final Paint mPaint;
	private int mScale;

	/** Letter tile */
	private static TypedArray sColors;
	private static int sDefaultColor;
	private static int sTileLetterFontSize;
	private static int sTileLetterFontSizeSmall;
	private static int sTileFontColor;
	private static Bitmap DEFAULT_AVATAR;
	/** Reusable components to avoid new allocations */
	private static final Paint sPaint = new Paint();
	private static final Rect sRect = new Rect();
	private static final char[] sFirstChar = new char[1];

	/** This should match the total number of colors defined in colors.xml for letter_tile_color */
	private static final int NUM_OF_TILE_COLORS = 8;

	public ContactDrawable(final Resources res, final BitmapCache cache,
	final ContactResolver contactResolver) {
	mCache = cache;
	mContactResolver = contactResolver;
	mPaint = new Paint();
	mPaint.setFilterBitmap(true);
	mPaint.setDither(true);

	if (sColors == null) {
	sColors = res.obtainTypedArray(R.array.letter_tile_colors);
	sDefaultColor = res.getColor(R.color.letter_tile_default_color);
	sTileLetterFontSize = res.getDimensionPixelSize(R.dimen.tile_letter_font_size);
	sTileLetterFontSizeSmall = res
	.getDimensionPixelSize(R.dimen.tile_letter_font_size_small);
	sTileFontColor = res.getColor(R.color.letter_tile_font_color);
	DEFAULT_AVATAR = BitmapFactory.decodeResource(res, R.drawable.ic_generic_man);

	sPaint.setTypeface(Typeface.create("sans-serif-light", Typeface.NORMAL));
	sPaint.setTextAlign(Align.CENTER);
	sPaint.setAntiAlias(true);
	}
	}

	@Override
	public void draw(final Canvas canvas) {
	final Rect bounds = getBounds();
	if (!isVisible() \|\| bounds.isEmpty()) {
	return;
	}

	if (mBitmap != null && mBitmap.bmp != null) {
	// Draw sender image.
	drawBitmap(mBitmap.bmp, mBitmap.getLogicalWidth(), mBitmap.getLogicalHeight(), canvas);
	} else {
	// Draw letter tile.
	drawLetterTile(canvas);
	}
	}

	/**
	* Draw the bitmap onto the canvas at the current bounds taking into account the current scale.
	*/
	private void drawBitmap(final Bitmap bitmap, final int width, final int height,
	final Canvas canvas) {
	final Rect bounds = getBounds();

	if (mScale != ContactGridDrawable.SCALE_TYPE_HALF) {
	sRect.set(0, 0, width, height);
	} else {
	// For skinny bounds, draw the middle two quarters.
	sRect.set(width / 4, 0, width / 4 * 3, height);
	}
	canvas.drawBitmap(bitmap, sRect, bounds, mPaint);
	}

	private void drawLetterTile(final Canvas canvas) {
	if (mContactRequest == null) {
	return;
	}

	// Draw background color.
	final String email = mContactRequest.getEmail();
	sPaint.setColor(pickColor(email));
	sPaint.setAlpha(mPaint.getAlpha());
	canvas.drawRect(getBounds(), sPaint);

	// Draw letter/digit or generic avatar.
	final String displayName = mContactRequest.getDisplayName();
	final char firstChar = displayName.charAt(0);
	final Rect bounds = getBounds();
	if (isEnglishLetterOrDigit(firstChar)) {
	// Draw letter or digit.
	sFirstChar[0] = Character.toUpperCase(firstChar);
	sPaint.setTextSize(mScale == ContactGridDrawable.SCALE_TYPE_ONE ? sTileLetterFontSize
	: sTileLetterFontSizeSmall);
	sPaint.getTextBounds(sFirstChar, 0, 1, sRect);
	sPaint.setColor(sTileFontColor);
	canvas.drawText(sFirstChar, 0, 1, bounds.centerX(),
	bounds.centerY() + sRect.height() / 2, sPaint);
	} else {
	drawBitmap(DEFAULT_AVATAR, DEFAULT_AVATAR.getWidth(), DEFAULT_AVATAR.getHeight(),
	canvas);
	}
	}

	private static int pickColor(final String email) {
	// String.hashCode() implementation is not supposed to change across java versions, so
	// this should guarantee the same email address always maps to the same color.
	// The email should already have been normalized by the ContactRequest.
	final int color = Math.abs(email.hashCode()) % NUM_OF_TILE_COLORS;
	return sColors.getColor(color, sDefaultColor);
	}

	private static boolean isEnglishLetterOrDigit(final char c) {
	return ('A' <= c && c <= 'Z') \|\| ('a' <= c && c <= 'z') \|\| ('0' <= c && c <= '9');
	}

	@Override
	public void setAlpha(final int alpha) {
	mPaint.setAlpha(alpha);
	}

	@Override
	public void setColorFilter(final ColorFilter cf) {
	mPaint.setColorFilter(cf);
	}

	@Override
	public int getOpacity() {
	return 0;
	}

	public void setDecodeDimensions(final int decodeWidth, final int decodeHeight) {
	mCache.setPoolDimensions(decodeWidth, decodeHeight);
	}

	public void setScale(final int scale) {
	mScale = scale;
	}

	public void unbind() {
	setImage(null);
	}

	public void bind(final String name, final String email) {
	setImage(new ContactRequest(name, email));
	}

	private void setImage(final ContactRequest contactRequest) {
	if (mContactRequest != null && mContactRequest.equals(contactRequest)) {
	return;
	}

	if (mBitmap != null) {
	mBitmap.releaseReference();
	mBitmap = null;
	}

	mContactResolver.remove(mContactRequest, this);
	mContactRequest = contactRequest;

	if (contactRequest == null) {
	invalidateSelf();
	return;
	}

	final ReusableBitmap cached = mCache.get(contactRequest, true /* incrementRefCount */);
	if (cached != null) {
	setBitmap(cached);
	} else {
	decode();
	}
	}

	private void setBitmap(final ReusableBitmap bmp) {
	if (mBitmap != null && mBitmap != bmp) {
	mBitmap.releaseReference();
	}
	mBitmap = bmp;
	invalidateSelf();
	}

	private void decode() {
	if (mContactRequest == null) {
	return;
	}
	// Add to batch.
	mContactResolver.add(mContactRequest, this);
	}

	public void onDecodeComplete(final Request key, final ReusableBitmap result) {
	final ContactRequest request = (ContactRequest) key;
	// Remove from batch.
	mContactResolver.remove(request, this);
	if (request.equals(mContactRequest)) {
	setBitmap(result);
	} else {
	// if the requests don't match (i.e. this request is stale), decrement the
	// ref count to allow the bitmap to be pooled
	if (result != null) {
	result.releaseReference();
	}
	}
	}
	}