73 lines
3 KiB
C
73 lines
3 KiB
C
/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file convert_srgb.h
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* @author rdb
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* @date 2014-11-13
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*/
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#ifndef CONVERT_SRGB_H
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#define CONVERT_SRGB_H
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#include "pandabase.h"
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#include "luse.h"
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#include "pnmimage_base.h"
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// The below functions can encode and decode sRGB colors in various
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// representations. Some of them are implemented using look-up tables, some
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// others using SSE2 intrinsics.
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extern EXPCL_PANDA_PNMIMAGE const unsigned char to_srgb8_table[256];
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extern EXPCL_PANDA_PNMIMAGE const unsigned char to_linear_uchar_table[256];
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extern EXPCL_PANDA_PNMIMAGE const float to_linear_float_table[256];
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BEGIN_PUBLISH
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EXPCL_PANDA_PNMIMAGE INLINE float decode_sRGB_float(unsigned char val);
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EXPCL_PANDA_PNMIMAGE INLINE float decode_sRGB_float(float val);
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EXPCL_PANDA_PNMIMAGE INLINE unsigned char decode_sRGB_uchar(unsigned char val);
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EXPCL_PANDA_PNMIMAGE INLINE unsigned char decode_sRGB_uchar(float val);
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EXPCL_PANDA_PNMIMAGE INLINE float encode_sRGB_float(unsigned char val);
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EXPCL_PANDA_PNMIMAGE INLINE float encode_sRGB_float(float val);
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EXPCL_PANDA_PNMIMAGE INLINE unsigned char encode_sRGB_uchar(unsigned char val);
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EXPCL_PANDA_PNMIMAGE INLINE unsigned char encode_sRGB_uchar(float val);
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END_PUBLISH
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// These functions convert more than one component in one go, which can be
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// faster due to vectorization.
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EXPCL_PANDA_PNMIMAGE INLINE void encode_sRGB_uchar(const LColorf &from,
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xel &into);
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EXPCL_PANDA_PNMIMAGE INLINE void encode_sRGB_uchar(const LColorf &from,
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xel &into, xelval &into_alpha);
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EXPCL_PANDA_PNMIMAGE INLINE void encode_sRGB_uchar(const LColord &from,
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xel &into);
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EXPCL_PANDA_PNMIMAGE INLINE void encode_sRGB_uchar(const LColord &from,
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xel &into, xelval &into_alpha);
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// Use these functions if you know that SSE2 support is available. Otherwise,
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// they will crash!
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#if defined(__SSE2__) || defined(__i386__) || defined(_M_IX86) || defined(_M_X64) || defined(_M_AMD64)
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EXPCL_PANDA_PNMIMAGE unsigned char encode_sRGB_uchar_sse2(float val);
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EXPCL_PANDA_PNMIMAGE void encode_sRGB_uchar_sse2(const LColorf &from,
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xel &into);
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EXPCL_PANDA_PNMIMAGE void encode_sRGB_uchar_sse2(const LColorf &from,
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xel &into, xelval &into_alpha);
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// Use the following to find out if you can call either of the above.
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EXPCL_PANDA_PNMIMAGE bool has_sse2_sRGB_encode();
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#else
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// The target architecture can't support the SSE2 extension at all.
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#define encode_sRGB_uchar_sse2 encode_sRGB_uchar
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#define has_sse2_sRGB_encode() (false)
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#endif
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#include "convert_srgb.I"
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#endif
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