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/* -*- 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;
}
}
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