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Side by Side Diff: webkit/port/bindings/v8/CanvasPixelArray.cpp

Issue 16617: Chrome side of webkit merge to 40124.... (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: '' Created 11 years, 11 months ago
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1 /*
2 * Copyright (c) 2009, Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "config.h"
32 #include <CanvasPixelArray.h>
33
34 #include <v8_proxy.h>
35 #include <wtf/Assertions.h>
36
37 namespace WebCore {
38
39 CanvasPixelArray::CanvasPixelArray(size_t length)
40 {
41 ASSERT((length & 3) == 0); // Length must be a multiple of 4.
42 m_length = length;
43 m_data = static_cast<unsigned char*>(fastMalloc(m_length));
44 }
45
46 CanvasPixelArray::~CanvasPixelArray()
47 {
48 fastFree(m_data);
49 // Ensure that accesses after destruction will fail. In case there is a
50 // dangling reference.
51 m_length = 0;
52 m_data = reinterpret_cast<unsigned char*>(-1);
53 }
54
55 size_t CanvasPixelArray::length() const
56 {
57 return m_length;
58 }
59
60 unsigned char* CanvasPixelArray::data()
61 {
62 return m_data;
63 }
64
65 unsigned char CanvasPixelArray::get(size_t index)
66 {
67 ASSERT(index < m_length);
68 return m_data[index];
69 }
70
71 void CanvasPixelArray::set(size_t index, double value)
72 {
73 ASSERT(index < m_length);
74 if (!(value > 0)) { // Test for NaN and less than zero in one go.
75 value = 0;
76 } else if (value > 255) {
77 value = 255;
78 }
79 m_data[index] = static_cast<unsigned char>(value + 0.5);
80 }
81
82 } // namespace WebCore
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