Remove image decoder and encoder autoregistration

src/images/SkImageDecoder_Factory.cpp

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkErrorInternals.h"
+#include "SkImageDecoder.h"
+#include "SkImageDecoder_libjpeg.h"
+#include "SkImageDecoder_libwebp.h"
+#include "SkImageDecoder_libico.h"
+#include "SkImageDecoder_libbmp.h"
+#include "SkImageDecoder_wbmp.h"
+#include "SkMovie.h"
+#include "SkStream.h"
+
+#if defined(SK_BUILD_FOR_WIN)
+#include "SkImageDecoder_WIC.h"
+#endif
+#if defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)
+#include "SkImageDecoder_CG.h"
+#endif
+#if !defined(SK_BUILD_FOR_MAC) && !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_WIN)
+#include "SkImageDecoder_libpng.h"
+#endif
+#if !defined(SK_BUILD_FOR_MAC) && !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_WIN) && \
+    !defined(SK_BUILD_FOR_NACL)
+#include "SkImageDecoder_libgif.h"
+#include "SkMovie_gif.h"
+#endif
+#if !defined(SK_BUILD_FOR_ANDROID_FRAMEWORK)
+#include "SkImageDecoder_astc.h"
+#include "SkImageDecoder_ktx.h"
+#include "SkImageDecoder_pkm.h"
+#endif
+
+// This file is used for registration of SkImageDecoders. It also holds a function for checking all
+// the the registered SkImageDecoders for one that matches an input SkStreamRewindable.
+
+// The order of the factory functions defines the order image decoders are tested when decoding a
+// stream. The first function is the first one tested, so the functions should be listed in order
+// from the most likely to be used, to the least likely. JPEG and PNG should be the first two, for
+// instance.
+
+typedef SkImageDecoder* (*FactoryCreateFunc)(SkImageDecoder::Format);
+typedef SkImageDecoder::Format (*FactoryDetectFormatFunc)(SkStreamRewindable*);
+static const struct {
+    const FactoryCreateFunc createFunc;
+    const FactoryDetectFormatFunc detectFormatFunc;
+} gDecoderFactoryFuncs[] = {
+#if !defined(SK_BUILD_FOR_MAC) && !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_WIN)
+    { SkCreatePNGImageDecoder, SkDetectFormatPNGImageDecoder },
+#endif
+    { SkCreateJPEGImageDecoder, SkDetectFormatJPEGImageDecoder },
+    { SkCreateWEBPImageDecoder, SkDetectFormatWEBPImageDecoder },
+    { SkCreateICOImageDecoder, SkDetectFormatICOImageDecoder },
+#if !defined(SK_BUILD_FOR_MAC) && !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_WIN) && \
+    !defined(SK_BUILD_FOR_NACL)
+    { SkCreateGIFImageDecoder, SkDetectFormatGIFImageDecoder },
+#endif
+    { SkCreateBMPImageDecoder, SkDetectFormatBMPImageDecoder },
+#if !defined(SK_BUILD_FOR_ANDROID_FRAMEWORK)
+    { SkCreateASTCImageDecoder, SkDetectFormatASTCImageDecoder },
+    { SkCreateKTXImageDecoder, SkDetectFormatKTXImageDecoder },
+    { SkCreatePKMImageDecoder, SkDetectFormatPKMImageDecoder },
+#endif
+    { SkCreateWBMPImageDecoder, SkDetectFormatWBMPImageDecoder },
+#if defined(SK_BUILD_FOR_WIN)
+    { SkCreateImageDecoder_WIC, SkDetectFormatImageDecoder_WIC }
+#elif defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)
+    { SkCreateImageDecoder_CG, SkDetectFormatImageDecoder_CG }
+#endif
+};
+
+SkImageDecoder* SkImageDecoder::Factory(SkStreamRewindable* stream) {
+    for (size_t i = 0; i < SK_ARRAY_COUNT(gDecoderFactoryFuncs); ++i) {
+        FactoryDetectFormatFunc detectFormatFunc = gDecoderFactoryFuncs[i].detectFormatFunc;
+        Format format = detectFormatFunc(stream);
+
+        // We rewind here, because we promise later when we call "decode", that the stream will be
+        // at its beginning.
+        bool rewindSuceeded = stream->rewind();
+
+        // Our image decoders require that rewind is supported so we fail early if we are given a
+        // stream that does not support rewinding.
+        if (!rewindSuceeded) {
+            SkDEBUGF(("Unable to rewind the image stream."));
+            return NULL;
+        }
+
+        if (SkImageDecoder::kUnknown_Format != format) {
+            FactoryCreateFunc createFunc = gDecoderFactoryFuncs[i].createFunc;
+            SkImageDecoder* codec = createFunc(format);
+            SkASSERT(NULL != codec);
+            return codec;
+        }
+    }
+    return NULL;
+}
+
+SkImageDecoder::Format SkImageDecoder::GetStreamFormat(SkStreamRewindable* stream) {
+    for (size_t i = 0; i < SK_ARRAY_COUNT(gDecoderFactoryFuncs); ++i) {
+        FactoryDetectFormatFunc detectFormatFunc = gDecoderFactoryFuncs[i].detectFormatFunc;
+        Format format = detectFormatFunc(stream);
+        if (!stream->rewind()) {
+            SkErrorInternals::SetError(kInvalidOperation_SkError,
+                                       "Unable to rewind the image stream\n");
+            return kUnknown_Format;
+        }
+        if (format != kUnknown_Format) {
+            return format;
+        }
+    }
+    return kUnknown_Format;
+}
+
+SkMovie* SkMovie::DecodeStream(SkStreamRewindable* stream) {
+    SkMovie* movie = NULL;
+#if !defined(SK_BUILD_FOR_MAC) && !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_WIN) && \
+    !defined(SK_BUILD_FOR_NACL)
+    movie = SkGIFMovieCreate(stream);
+    if (NULL == movie) {
+        stream->rewind();
+    }
+#endif
+    return movie;
+}