1/*
2 * Copyright (C) 2006 Apple Inc. All rights reserved.
3 * Copyright (C) 2008-2009 Torch Mobile, Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#pragma once
28
29#include "ScalableImageDecoder.h"
30#include <stdio.h> // Needed by jpeglib.h for FILE.
31
32// ICU defines TRUE and FALSE macros, breaking libjpeg v9 headers
33#undef TRUE
34#undef FALSE
35extern "C" {
36#include "jpeglib.h"
37}
38
39namespace WebCore {
40
41 class JPEGImageReader;
42
43 // This class decodes the JPEG image format.
44 class JPEGImageDecoder final : public ScalableImageDecoder {
45 public:
46 static Ref<ScalableImageDecoder> create(AlphaOption alphaOption, GammaAndColorProfileOption gammaAndColorProfileOption)
47 {
48 return adoptRef(*new JPEGImageDecoder(alphaOption, gammaAndColorProfileOption));
49 }
50
51 virtual ~JPEGImageDecoder();
52
53 // ScalableImageDecoder
54 String filenameExtension() const override { return "jpg"_s; }
55 bool setSize(const IntSize&) override;
56 ScalableImageDecoderFrame* frameBufferAtIndex(size_t index) override;
57 // CAUTION: setFailed() deletes |m_reader|. Be careful to avoid
58 // accessing deleted memory, especially when calling this from inside
59 // JPEGImageReader!
60 bool setFailed() override;
61
62 bool willDownSample()
63 {
64 ASSERT(ScalableImageDecoder::encodedDataStatus() >= EncodedDataStatus::SizeAvailable);
65 return m_scaled;
66 }
67
68 bool outputScanlines();
69 void jpegComplete();
70
71 void setOrientation(ImageOrientation orientation) { m_orientation = orientation; }
72
73 private:
74 JPEGImageDecoder(AlphaOption, GammaAndColorProfileOption);
75 void tryDecodeSize(bool allDataReceived) override { decode(true, allDataReceived); }
76
77 // Decodes the image. If |onlySize| is true, stops decoding after
78 // calculating the image size. If decoding fails but there is no more
79 // data coming, sets the "decode failure" flag.
80 void decode(bool onlySize, bool allDataReceived);
81
82 template <J_COLOR_SPACE colorSpace>
83 bool outputScanlines(ScalableImageDecoderFrame& buffer);
84
85 template <J_COLOR_SPACE colorSpace, bool isScaled>
86 bool outputScanlines(ScalableImageDecoderFrame& buffer);
87
88 std::unique_ptr<JPEGImageReader> m_reader;
89 };
90
91} // namespace WebCore
92