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author | marha <marha@users.sourceforge.net> | 2014-08-11 21:14:48 +0200 |
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committer | marha <marha@users.sourceforge.net> | 2014-08-11 21:14:48 +0200 |
commit | fdbedba4d50e1b28b0249c83ba11c029f096e400 (patch) | |
tree | a80ccb6275fd99644c79c67856e9c1bf1b323d62 /mesalib/src/util/format_srgb.h | |
parent | b33b8d8ae86876b50df96881b96074b3fe177cce (diff) | |
download | vcxsrv-fdbedba4d50e1b28b0249c83ba11c029f096e400.tar.gz vcxsrv-fdbedba4d50e1b28b0249c83ba11c029f096e400.tar.bz2 vcxsrv-fdbedba4d50e1b28b0249c83ba11c029f096e400.zip |
fontconfig libX11 libxcb libxcb/xcb-proto mesa xserver xkeyboard-config git update 11 Aug 2014
xserver commit 3714f5401690b288045090c4bcd9cb01c6e4860e
libxcb commit 966fba6ba4838949d0727dfa45eeb9392d1f85d9
libxcb/xcb-proto commit 4b384d2a015c50d0e93dcacda4b8260a3fd37640
xkeyboard-config commit 651a00ab656a1754b9183a383970a735209bbb50
libX11 commit 368a6401c6a3275d3497fec38a3dcbc38cd9df60
libXdmcp commit fe8eab93e9bcdbe8bb8052434bb5e676e3a0ee8f
libXext commit efdcbb7634501e1117d422636a0a75d7ea84b16b
libfontenc commit 0037a42107b952c9d903719615747e760e4e7247
libXinerama commit edd95182b26eb5d576d4878c559e0f17dddaa909
libXau commit 1e4635be11154dd8262f37b379511bd627defa2a
xkbcomp commit d4e02a09258063c6d024c3ccd42d6b22212e6e18
pixman commit 6d2cf40166d81bfc63108504c8022dc4fec37ff5
xextproto commit 66afec3f49e8eb0d4c2e9af7088fc3116d4bafd7
randrproto commit a4a6694c059d74247c16527eef4a0ec9f56bbef6
glproto commit f84853d97d5749308992412a215fa518b6536eb3
mkfontscale commit 47908fd7a0d061fdcd21e3498da4e223ca9136d9
xwininfo commit 017b3736489985999d8dcf4d9e473e1fd6dd3647
libXft commit 214f9b5306d833e2787c75fe41dfdc9228fcb738
libXmu commit 22d9c590901e121936f50dee97dc60c4f7defb63
libxtrans commit a57a7f62242e1ea972b81414741729bf3dbae0a4
fontconfig commit 841753a93f0e5698663b7931b8456e7b96259f54
mesa commit f24be7340162c6a831b392d46d6637e9656e7a8a
Diffstat (limited to 'mesalib/src/util/format_srgb.h')
-rw-r--r-- | mesalib/src/util/format_srgb.h | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/mesalib/src/util/format_srgb.h b/mesalib/src/util/format_srgb.h new file mode 100644 index 000000000..4a8d73f12 --- /dev/null +++ b/mesalib/src/util/format_srgb.h @@ -0,0 +1,149 @@ +/************************************************************************** + * + * 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 <stdint.h> +#include <math.h> +#include "c99_compat.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]; + + +static inline float +util_format_linear_to_srgb_float(float cl) +{ + if (cl < 0.0f) + return 0.0f; + else if (cl < 0.0031308f) + return 12.92f * cl; + else if (cl < 1.0f) + return 1.055f * powf(cl, 0.41666f) - 0.055f; + else + return 1.0f; +} + + +/** + * 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 is taken from https://gist.github.com/rygorous/2203834 + * Use LUT and do linear interpolation. + */ + union { + uint32_t ui; + float f; + } 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_ */ |