1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Android code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2012
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Patrick Walton <pcwalton@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
package org.mozilla.gecko.gfx;
import android.graphics.Color;
import org.libreoffice.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);
}
} 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;
}
}
|
