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Diffstat (limited to 'mesalib/src/gallium/auxiliary/util/u_format_srgb.h')
| -rw-r--r-- | mesalib/src/gallium/auxiliary/util/u_format_srgb.h | 147 |
1 files changed, 0 insertions, 147 deletions
diff --git a/mesalib/src/gallium/auxiliary/util/u_format_srgb.h b/mesalib/src/gallium/auxiliary/util/u_format_srgb.h deleted file mode 100644 index 740a91974..000000000 --- a/mesalib/src/gallium/auxiliary/util/u_format_srgb.h +++ /dev/null @@ -1,147 +0,0 @@ -/************************************************************************** - * - * 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 <brianp@vmware.com> - * @author Michal Krol <michal@vmware.com> - * @author Jose Fonseca <jfonseca@vmware.com> - */ - -#ifndef U_FORMAT_SRGB_H_ -#define U_FORMAT_SRGB_H_ - - -#include "pipe/p_compiler.h" -#include "u_pack_color.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]; - -extern const unsigned -util_format_linear_to_srgb_helper_table[104]; - - -/** - * Convert a unclamped linear float to srgb value in the [0,255]. - */ -static INLINE uint8_t -util_format_linear_float_to_srgb_8unorm(float x) -{ - /* this would be exact but (probably much) slower */ - if (0) { - if (x >= 1.0f) - return 255; - else if (x >= 0.0031308f) - return float_to_ubyte(1.055f * powf(x, 0.41666666f) - 0.055f); - else if (x > 0.0f) - return float_to_ubyte(12.92f * x); - else - return 0; - } - else { - /* - * This is taken from https://gist.github.com/rygorous/2203834 - * Use LUT and do linear interpolation. - */ - union fi almostone, minval, f; - unsigned tab, bias, scale, t; - - almostone.ui = 0x3f7fffff; - minval.ui = (127-13) << 23; - - /* - * Clamp to [2^(-13), 1-eps]; these two values map to 0 and 1, respectively. - * The tests are carefully written so that NaNs map to 0, same as in the - * reference implementation. - */ - if (!(x > minval.f)) - x = minval.f; - if (x > almostone.f) - x = almostone.f; - - /* Do the table lookup and unpack bias, scale */ - f.f = x; - tab = util_format_linear_to_srgb_helper_table[(f.ui - minval.ui) >> 20]; - bias = (tab >> 16) << 9; - scale = tab & 0xffff; - - /* Grab next-highest mantissa bits and perform linear interpolation */ - t = (f.ui >> 12) & 0xff; - return (uint8_t) ((bias + scale*t) >> 16); - } -} - - -/** - * 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]; -} - - -/* - * XXX These 2 functions probably don't make a lot of sense (but lots - * of potential callers which most likely all don't make sense neither) - */ - -/** - * 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_ */ |