Remove image decoder and encoder autoregistration

src/images/SkImageDecoder_FactoryRegistrar.cpp

-/*
- * Copyright 2013 The Android Open Source Project
- *
- * 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 "SkStream.h"
-#include "SkTRegistry.h"
-
-// 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.
-
-template SkImageDecoder_DecodeReg* SkImageDecoder_DecodeReg::gHead;
-
-SkImageDecoder* image_decoder_from_stream(SkStreamRewindable*);
-
-SkImageDecoder* image_decoder_from_stream(SkStreamRewindable* stream) {
-    SkImageDecoder* codec = NULL;
-    const SkImageDecoder_DecodeReg* curr = SkImageDecoder_DecodeReg::Head();
-    while (curr) {
-        codec = curr->factory()(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 decoder's 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."));
-            SkDELETE(codec);
-            return NULL;
-        }
-
-        if (codec) {
-            return codec;
-        }
-        curr = curr->next();
-    }
-    return NULL;
-}
-
-template SkImageDecoder_FormatReg* SkImageDecoder_FormatReg::gHead;
-
-SkImageDecoder::Format SkImageDecoder::GetStreamFormat(SkStreamRewindable* stream) {
-    const SkImageDecoder_FormatReg* curr = SkImageDecoder_FormatReg::Head();
-    while (curr != NULL) {
-        Format format = curr->factory()(stream);
-        if (!stream->rewind()) {
-            SkErrorInternals::SetError(kInvalidOperation_SkError,
-                                       "Unable to rewind the image stream\n");
-            return kUnknown_Format;
-        }
-        if (format != kUnknown_Format) {
-            return format;
-        }
-        curr = curr->next();
-    }
-    return kUnknown_Format;
-}