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| 1 /* |
| 2 * Copyright 2014 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #include "SkErrorInternals.h" |
| 9 #include "SkImageDecoder.h" |
| 10 #include "SkImageDecoder_libjpeg.h" |
| 11 #include "SkImageDecoder_libwebp.h" |
| 12 #include "SkImageDecoder_libico.h" |
| 13 #include "SkImageDecoder_libbmp.h" |
| 14 #include "SkImageDecoder_wbmp.h" |
| 15 #include "SkMovie.h" |
| 16 #include "SkStream.h" |
| 17 |
| 18 #if defined(SK_BUILD_FOR_WIN) |
| 19 #include "SkImageDecoder_WIC.h" |
| 20 #endif |
| 21 #if defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS) |
| 22 #include "SkImageDecoder_CG.h" |
| 23 #endif |
| 24 #if !defined(SK_BUILD_FOR_MAC) && !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUIL
D_FOR_WIN) |
| 25 #include "SkImageDecoder_libpng.h" |
| 26 #endif |
| 27 #if !defined(SK_BUILD_FOR_MAC) && !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUIL
D_FOR_WIN) && \ |
| 28 !defined(SK_BUILD_FOR_NACL) |
| 29 #include "SkImageDecoder_libgif.h" |
| 30 #include "SkMovie_gif.h" |
| 31 #endif |
| 32 #if !defined(SK_BUILD_FOR_ANDROID_FRAMEWORK) |
| 33 #include "SkImageDecoder_astc.h" |
| 34 #include "SkImageDecoder_ktx.h" |
| 35 #include "SkImageDecoder_pkm.h" |
| 36 #endif |
| 37 |
| 38 // This file is used for registration of SkImageDecoders. It also holds a functi
on for checking all |
| 39 // the the registered SkImageDecoders for one that matches an input SkStreamRewi
ndable. |
| 40 |
| 41 // The order of the factory functions defines the order image decoders are teste
d when decoding a |
| 42 // stream. The first function is the first one tested, so the functions should b
e listed in order |
| 43 // from the most likely to be used, to the least likely. JPEG and PNG should be
the first two, for |
| 44 // instance. |
| 45 |
| 46 typedef SkImageDecoder* (*FactoryCreateFunc)(SkImageDecoder::Format); |
| 47 typedef SkImageDecoder::Format (*FactoryDetectFormatFunc)(SkStreamRewindable*); |
| 48 static const struct { |
| 49 const FactoryCreateFunc createFunc; |
| 50 const FactoryDetectFormatFunc detectFormatFunc; |
| 51 } gDecoderFactoryFuncs[] = { |
| 52 #if !defined(SK_BUILD_FOR_MAC) && !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUIL
D_FOR_WIN) |
| 53 { SkCreatePNGImageDecoder, SkDetectFormatPNGImageDecoder }, |
| 54 #endif |
| 55 { SkCreateJPEGImageDecoder, SkDetectFormatJPEGImageDecoder }, |
| 56 { SkCreateWEBPImageDecoder, SkDetectFormatWEBPImageDecoder }, |
| 57 { SkCreateICOImageDecoder, SkDetectFormatICOImageDecoder }, |
| 58 #if !defined(SK_BUILD_FOR_MAC) && !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUIL
D_FOR_WIN) && \ |
| 59 !defined(SK_BUILD_FOR_NACL) |
| 60 { SkCreateGIFImageDecoder, SkDetectFormatGIFImageDecoder }, |
| 61 #endif |
| 62 { SkCreateBMPImageDecoder, SkDetectFormatBMPImageDecoder }, |
| 63 #if !defined(SK_BUILD_FOR_ANDROID_FRAMEWORK) |
| 64 { SkCreateASTCImageDecoder, SkDetectFormatASTCImageDecoder }, |
| 65 { SkCreateKTXImageDecoder, SkDetectFormatKTXImageDecoder }, |
| 66 { SkCreatePKMImageDecoder, SkDetectFormatPKMImageDecoder }, |
| 67 #endif |
| 68 { SkCreateWBMPImageDecoder, SkDetectFormatWBMPImageDecoder }, |
| 69 #if defined(SK_BUILD_FOR_WIN) |
| 70 { SkCreateImageDecoder_WIC, SkDetectFormatImageDecoder_WIC } |
| 71 #elif defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS) |
| 72 { SkCreateImageDecoder_CG, SkDetectFormatImageDecoder_CG } |
| 73 #endif |
| 74 }; |
| 75 |
| 76 SkImageDecoder* SkImageDecoder::Factory(SkStreamRewindable* stream) { |
| 77 for (size_t i = 0; i < SK_ARRAY_COUNT(gDecoderFactoryFuncs); ++i) { |
| 78 FactoryDetectFormatFunc detectFormatFunc = gDecoderFactoryFuncs[i].detec
tFormatFunc; |
| 79 Format format = detectFormatFunc(stream); |
| 80 |
| 81 // We rewind here, because we promise later when we call "decode", that
the stream will be |
| 82 // at its beginning. |
| 83 bool rewindSuceeded = stream->rewind(); |
| 84 |
| 85 // Our image decoders require that rewind is supported so we fail early
if we are given a |
| 86 // stream that does not support rewinding. |
| 87 if (!rewindSuceeded) { |
| 88 SkDEBUGF(("Unable to rewind the image stream.")); |
| 89 return NULL; |
| 90 } |
| 91 |
| 92 if (SkImageDecoder::kUnknown_Format != format) { |
| 93 FactoryCreateFunc createFunc = gDecoderFactoryFuncs[i].createFunc; |
| 94 SkImageDecoder* codec = createFunc(format); |
| 95 SkASSERT(NULL != codec); |
| 96 return codec; |
| 97 } |
| 98 } |
| 99 return NULL; |
| 100 } |
| 101 |
| 102 SkImageDecoder::Format SkImageDecoder::GetStreamFormat(SkStreamRewindable* strea
m) { |
| 103 for (size_t i = 0; i < SK_ARRAY_COUNT(gDecoderFactoryFuncs); ++i) { |
| 104 FactoryDetectFormatFunc detectFormatFunc = gDecoderFactoryFuncs[i].detec
tFormatFunc; |
| 105 Format format = detectFormatFunc(stream); |
| 106 if (!stream->rewind()) { |
| 107 SkErrorInternals::SetError(kInvalidOperation_SkError, |
| 108 "Unable to rewind the image stream\n"); |
| 109 return kUnknown_Format; |
| 110 } |
| 111 if (format != kUnknown_Format) { |
| 112 return format; |
| 113 } |
| 114 } |
| 115 return kUnknown_Format; |
| 116 } |
| 117 |
| 118 SkMovie* SkMovie::DecodeStream(SkStreamRewindable* stream) { |
| 119 SkMovie* movie = NULL; |
| 120 #if !defined(SK_BUILD_FOR_MAC) && !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUIL
D_FOR_WIN) && \ |
| 121 !defined(SK_BUILD_FOR_NACL) |
| 122 movie = SkGIFMovieCreate(stream); |
| 123 if (NULL == movie) { |
| 124 stream->rewind(); |
| 125 } |
| 126 #endif |
| 127 return movie; |
| 128 } |
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