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This represents UE4/Main @ 14768117 For ReleaseObjectVersion.h #lockdown Marcus.Wassmer [CL 14811440 by Marc Audy in ue5-main branch]
103 lines
2.8 KiB
C++
103 lines
2.8 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "CoreTypes.h"
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#include "ImageWrapperBase.h"
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#if WITH_UNREALPNG
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THIRD_PARTY_INCLUDES_START
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#include "ThirdParty/zlib/zlib-1.2.5/Inc/zlib.h"
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// make sure no other versions of libpng headers are picked up
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#if WITH_LIBPNG_1_6
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#include "ThirdParty/libPNG/libPNG-1.6.37/png.h"
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#include "ThirdParty/libPNG/libPNG-1.6.37/pngstruct.h"
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#include "ThirdParty/libPNG/libPNG-1.6.37/pnginfo.h"
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#else
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#include "ThirdParty/libPNG/libPNG-1.5.2/png.h"
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#include "ThirdParty/libPNG/libPNG-1.5.2/pnginfo.h"
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#endif
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#include <setjmp.h>
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THIRD_PARTY_INCLUDES_END
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/**
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* PNG implementation of the helper class.
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*
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* The implementation of this class is almost entirely based on the sample from the libPNG documentation.
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* See http://www.libpng.org/pub/png/libpng-1.2.5-manual.html for details.
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*
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* InitCompressed and InitRaw will set initial state and you will then be able to fill in Raw or
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* CompressedData by calling Uncompress or Compress respectively.
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*/
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class FPngImageWrapper
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: public FImageWrapperBase
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{
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public:
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/** Default Constructor. */
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FPngImageWrapper();
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public:
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//~ FImageWrapper interface
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virtual void Compress(int32 Quality) override;
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virtual void Reset() override;
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virtual bool SetCompressed(const void* InCompressedData, int64 InCompressedSize) override;
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virtual void Uncompress(const ERGBFormat InFormat, int32 InBitDepth) override;
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public:
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/**
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* Query whether this is a valid PNG type.
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*
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* @return true if data a PNG
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*/
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bool IsPNG() const;
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/**
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* Load the header information, returns true if successful.
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*
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* @return true if successful
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*/
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bool LoadPNGHeader();
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/** Helper function used to uncompress PNG data from a buffer */
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void UncompressPNGData(const ERGBFormat InFormat, const int32 InBitDepth);
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protected:
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// Callbacks for the pnglibs
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static void user_read_compressed(png_structp png_ptr, png_bytep data, png_size_t length);
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static void user_write_compressed(png_structp png_ptr, png_bytep data, png_size_t length);
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static void user_flush_data(png_structp png_ptr);
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static void user_error_fn(png_structp png_ptr, png_const_charp error_msg);
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static void user_warning_fn(png_structp png_ptr, png_const_charp warning_msg);
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static void* user_malloc(png_structp png_ptr, png_size_t size);
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static void user_free(png_structp png_ptr, png_voidp struct_ptr);
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private:
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/** The read offset into our array. */
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int64 ReadOffset;
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/** The color type as defined in the header. */
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int32 ColorType;
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/** The number of channels. */
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uint8 Channels;
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#if PLATFORM_ANDROID || PLATFORM_LUMIN || PLATFORM_LUMINGL4
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//Other platforms rely on libPNG internal mechanism to achieve concurrent compression\decompression on multiple threads
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/** setjmp buffer for error recovery. */
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jmp_buf SetjmpBuffer;
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#endif
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};
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#endif //WITH_UNREALPNG
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