android: remove CheckerboardImage class as it is not needed

Change-Id: I937eac9e613695490c8617aac85575f5e6fe290b

android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/CheckerboardImage.java

-/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-package org.mozilla.gecko.gfx;
-
-import android.graphics.Color;
-
-import org.libreoffice.kit.DirectBufferAllocator;
-
-import java.nio.ByteBuffer;
-import java.nio.ShortBuffer;
-import java.util.Arrays;
-
-/** A Cairo image that displays a tinted checkerboard. */
-public class CheckerboardImage extends CairoImage {
-    // The width and height of the checkerboard tile.
-    private static final int SIZE = 16;
-    // The pixel format of the checkerboard tile.
-    private static final int FORMAT = CairoImage.FORMAT_RGB16_565;
-    // The color to mix in to tint the background color.
-    private static final int TINT_COLOR = Color.GRAY;
-    // The amount to mix in.
-    private static final float TINT_OPACITY = 0.4f;
-
-    private ByteBuffer mBuffer;
-    private int mMainColor;
-    private boolean mShowChecks;
-
-    /** Creates a new checkerboard image. */
-    public CheckerboardImage() {
-        int bpp = CairoUtils.bitsPerPixelForCairoFormat(FORMAT);
-        mBuffer = DirectBufferAllocator.allocate(SIZE * SIZE * bpp / 8);
-        update(true, Color.WHITE);
-    }
-
-    /** Returns the current color of the checkerboard. */
-    public int getColor() {
-        return mMainColor;
-    }
-
-    /** Returns whether or not we are currently showing checks on the checkerboard. */
-    public boolean getShowChecks() {
-        return mShowChecks;
-    }
-
-    /** Updates the checkerboard image. If showChecks is true, then create a
-        checkerboard image that is tinted to the color. Otherwise just return a flat
-        image of the color. */
-    public void update(boolean showChecks, int color) {
-        mMainColor = color;
-        mShowChecks = showChecks;
-
-        short mainColor16 = convertTo16Bit(mMainColor);
-
-        mBuffer.rewind();
-        ShortBuffer shortBuffer = mBuffer.asShortBuffer();
-
-        if (!mShowChecks) {
-            short color16 = convertTo16Bit(mMainColor);
-            short[] fillBuffer = new short[SIZE];
-            Arrays.fill(fillBuffer, color16);
-
-            for (int i = 0; i < SIZE; i++) {
-                shortBuffer.put(fillBuffer);
-            }
-
-            return;
-        }
-
-        short tintColor16 = convertTo16Bit(tint(mMainColor));
-
-        short[] mainPattern = new short[SIZE / 2], tintPattern = new short[SIZE / 2];
-        Arrays.fill(mainPattern, mainColor16);
-        Arrays.fill(tintPattern, tintColor16);
-
-        // The checkerboard pattern looks like this:
-        //
-        // +---+---+
-        // | N | T |  N = normal
-        // +---+---+  T = tinted
-        // | T | N |
-        // +---+---+
-
-        for (int i = 0; i < SIZE / 2; i++) {
-            shortBuffer.put(mainPattern);
-            shortBuffer.put(tintPattern);
-        }
-        for (int i = SIZE / 2; i < SIZE; i++) {
-            shortBuffer.put(tintPattern);
-            shortBuffer.put(mainPattern);
-        }
-    }
-
-    // Tints the given color appropriately and returns the tinted color.
-    private int tint(int color) {
-        float negTintOpacity = 1.0f - TINT_OPACITY;
-        float r = Color.red(color) * negTintOpacity + Color.red(TINT_COLOR) * TINT_OPACITY;
-        float g = Color.green(color) * negTintOpacity + Color.green(TINT_COLOR) * TINT_OPACITY;
-        float b = Color.blue(color) * negTintOpacity + Color.blue(TINT_COLOR) * TINT_OPACITY;
-        return Color.rgb(Math.round(r), Math.round(g), Math.round(b));
-    }
-
-    // Converts a 32-bit ARGB color to 16-bit R5G6B5, truncating values and discarding the alpha
-    // channel.
-    private short convertTo16Bit(int color) {
-        int r = Color.red(color) >> 3, g = Color.green(color) >> 2, b = Color.blue(color) >> 3;
-        int c = ((r << 11) | (g << 5) | b);
-        // Swap endianness.
-        return (short)((c >> 8) | ((c & 0xff) << 8));
-    }
-
-    @Override
-    protected void finalize() throws Throwable {
-        try {
-            if (mBuffer != null) {
-                DirectBufferAllocator.free(mBuffer);
-                mBuffer = null;
-            }
-        } finally {
-            super.finalize();
-        }
-    }
-
-    @Override
-    public ByteBuffer getBuffer() {
-        return mBuffer;
-    }
-
-    @Override
-    public void destroy() {
-
-    }
-
-    @Override
-    public IntSize getSize() {
-        return new IntSize(SIZE, SIZE);
-    }
-
-    @Override
-    public int getFormat() {
-        return FORMAT;
-    }
-}
-