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Unified Diff: src/images/SkImageDecoder_FactoryRegistrar.cpp

Issue 1830723002: Revert of Delete SkImageDecoder (Closed) Base URL: https://skia.googlesource.com/skia.git@fix-animator
Patch Set: Created 4 years, 9 months ago
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Index: src/images/SkImageDecoder_FactoryRegistrar.cpp
diff --git a/src/images/SkImageDecoder_FactoryRegistrar.cpp b/src/images/SkImageDecoder_FactoryRegistrar.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..36034d20ad1ad7b00ef67c70fa2e2a478e692746
--- /dev/null
+++ b/src/images/SkImageDecoder_FactoryRegistrar.cpp
@@ -0,0 +1,63 @@
+/*
+ * 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 = nullptr;
+ 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."));
+ delete codec;
+ return nullptr;
+ }
+
+ if (codec) {
+ return codec;
+ }
+ curr = curr->next();
+ }
+ return nullptr;
+}
+
+template SkImageDecoder_FormatReg* SkImageDecoder_FormatReg::gHead;
+
+SkImageDecoder::Format SkImageDecoder::GetStreamFormat(SkStreamRewindable* stream) {
+ const SkImageDecoder_FormatReg* curr = SkImageDecoder_FormatReg::Head();
+ while (curr != nullptr) {
+ 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;
+}
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