59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
// Copyright (c) the JPEG XL Project Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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/// @addtogroup libjxl_cpp
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/// @{
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///
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/// @file decode_cxx.h
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/// @brief C++ header-only helper for @ref decode.h.
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///
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/// There's no binary library associated with the header since this is a header
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/// only library.
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#ifndef JXL_DECODE_CXX_H_
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#define JXL_DECODE_CXX_H_
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#include <jxl/decode.h>
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#include <jxl/memory_manager.h>
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#include <memory>
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#ifndef __cplusplus
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#error "This a C++ only header. Use jxl/decode.h from C sources."
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#endif
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/// Struct to call JxlDecoderDestroy from the JxlDecoderPtr unique_ptr.
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struct JxlDecoderDestroyStruct {
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/// Calls @ref JxlDecoderDestroy() on the passed decoder.
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void operator()(JxlDecoder* decoder) { JxlDecoderDestroy(decoder); }
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};
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/// std::unique_ptr<> type that calls JxlDecoderDestroy() when releasing the
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/// decoder.
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///
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/// Use this helper type from C++ sources to ensure the decoder is destroyed and
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/// their internal resources released.
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typedef std::unique_ptr<JxlDecoder, JxlDecoderDestroyStruct> JxlDecoderPtr;
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/// Creates an instance of JxlDecoder into a JxlDecoderPtr and initializes it.
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///
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/// This function returns a unique_ptr that will call JxlDecoderDestroy() when
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/// releasing the pointer. See @ref JxlDecoderCreate for details on the
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/// instance creation.
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///
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/// @param memory_manager custom allocator function. It may be NULL. The memory
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/// manager will be copied internally.
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/// @return a @c NULL JxlDecoderPtr if the instance can not be allocated or
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/// initialized
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/// @return initialized JxlDecoderPtr instance otherwise.
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static inline JxlDecoderPtr JxlDecoderMake(
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const JxlMemoryManager* memory_manager) {
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return JxlDecoderPtr(JxlDecoderCreate(memory_manager));
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}
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#endif // JXL_DECODE_CXX_H_
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/// @}
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