From 0402d388cb9803652c0f9a52ba7dcb6029fdd0b9 Mon Sep 17 00:00:00 2001 From: marha Date: Sat, 30 Apr 2011 15:25:48 +0000 Subject: Added extra needed files --- mesalib/src/gallium/auxiliary/util/u_format_srgb.h | 106 +++++++++++++++++++++ 1 file changed, 106 insertions(+) create mode 100644 mesalib/src/gallium/auxiliary/util/u_format_srgb.h (limited to 'mesalib/src/gallium/auxiliary/util/u_format_srgb.h') diff --git a/mesalib/src/gallium/auxiliary/util/u_format_srgb.h b/mesalib/src/gallium/auxiliary/util/u_format_srgb.h new file mode 100644 index 000000000..a1b12e9de --- /dev/null +++ b/mesalib/src/gallium/auxiliary/util/u_format_srgb.h @@ -0,0 +1,106 @@ +/************************************************************************** + * + * Copyright 2010 VMware, Inc. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR + * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE + * USE OR OTHER DEALINGS IN THE SOFTWARE. + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + **************************************************************************/ + +/** + * @file + * SRGB translation. + * + * @author Brian Paul + * @author Michal Krol + * @author Jose Fonseca + */ + +#ifndef U_FORMAT_SRGB_H_ +#define U_FORMAT_SRGB_H_ + + +#include "pipe/p_compiler.h" +#include "u_math.h" + + +extern const float +util_format_srgb_8unorm_to_linear_float_table[256]; + +extern const uint8_t +util_format_srgb_to_linear_8unorm_table[256]; + +extern const uint8_t +util_format_linear_to_srgb_8unorm_table[256]; + + +/** + * Convert a unclamped linear float to srgb value in the [0,255]. + * XXX this hasn't been tested (render to srgb surface). + * XXX this needs optimization. + */ +static INLINE uint8_t +util_format_linear_float_to_srgb_8unorm(float x) +{ + if (x >= 1.0f) + return 255; + else if (x >= 0.0031308f) + return float_to_ubyte(1.055f * powf(x, 0.41666f) - 0.055f); + else if (x > 0.0f) + return float_to_ubyte(12.92f * x); + else + return 0; +} + + +/** + * Convert an 8-bit sRGB value from non-linear space to a + * linear RGB value in [0, 1]. + * Implemented with a 256-entry lookup table. + */ +static INLINE float +util_format_srgb_8unorm_to_linear_float(uint8_t x) +{ + return util_format_srgb_8unorm_to_linear_float_table[x]; +} + + +/** + * Convert a 8bit normalized value from linear to srgb. + */ +static INLINE uint8_t +util_format_linear_to_srgb_8unorm(uint8_t x) +{ + return util_format_linear_to_srgb_8unorm_table[x]; +} + + +/** + * Convert a 8bit normalized value from srgb to linear. + */ +static INLINE uint8_t +util_format_srgb_to_linear_8unorm(uint8_t x) +{ + return util_format_srgb_to_linear_8unorm_table[x]; +} + + +#endif /* U_FORMAT_SRGB_H_ */ -- cgit v1.2.3