gallium: Move sRGB <-> RGB handling to libmesautil

Signed-off-by: Jason Ekstrand <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>

4 files changed, 2 insertions, 304 deletions

diff --git a/src/gallium/auxiliary/util/u_format_pack.py b/src/gallium/auxiliary/util/u_format_pack.py
index f9496de6c8a..a553e2346a9 100644
--- a/src/gallium/auxiliary/util/u_format_pack.py
+++ b/src/gallium/auxiliary/util/u_format_pack.py
@@ -669,7 +669,7 @@ def generate(formats):
     print '#include "u_half.h"'
     print '#include "u_format.h"'
     print '#include "u_format_other.h"'
-    print '#include "u_format_srgb.h"'
+    print '#include "util/format_srgb.h"'
     print '#include "u_format_yuv.h"'
     print '#include "u_format_zs.h"'
     print
diff --git a/src/gallium/auxiliary/util/u_format_s3tc.c b/src/gallium/auxiliary/util/u_format_s3tc.c
index 11b46020bc3..7e05989e6a1 100644
--- a/src/gallium/auxiliary/util/u_format_s3tc.c
+++ b/src/gallium/auxiliary/util/u_format_s3tc.c
@@ -27,7 +27,7 @@
 #include "u_math.h"
 #include "u_format.h"
 #include "u_format_s3tc.h"
-#include "u_format_srgb.h"
+#include "util/format_srgb.h"
 
 
 #if defined(_WIN32) || defined(WIN32)
diff --git a/src/gallium/auxiliary/util/u_format_srgb.h b/src/gallium/auxiliary/util/u_format_srgb.h
deleted file mode 100644
index 740a9197460..00000000000
--- a/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 <[email protected]>
- * @author Michal Krol <[email protected]>
- * @author Jose Fonseca <[email protected]>
- */
-
-#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_ */
diff --git a/src/gallium/auxiliary/util/u_format_srgb.py b/src/gallium/auxiliary/util/u_format_srgb.py
deleted file mode 100644
index c6c02f0538e..00000000000
--- a/src/gallium/auxiliary/util/u_format_srgb.py
+++ /dev/null
@@ -1,155 +0,0 @@
-#!/usr/bin/env python
-
-CopyRight = '''
-/**************************************************************************
- *
- * 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 above copyright notice and this permission notice (including the
- * next paragraph) shall be included in all copies or substantial portions
- * of the Software.
- *
- * 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 VMWARE 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.
- *
- **************************************************************************/
-
-/**
- * @file
- * SRGB translation.
- *
- * @author Brian Paul <[email protected]>
- * @author Michal Krol <[email protected]>
- * @author Jose Fonseca <[email protected]>
- */
-'''
-
-
-import math
-import struct
-
-
-def srgb_to_linear(x):
-    if x <= 0.04045:
-        return x / 12.92
-    else:
-        return math.pow((x + 0.055) / 1.055, 2.4)
-
-
-def linear_to_srgb(x):
-    if x >= 0.0031308:
-        return 1.055 * math.pow(x, 0.41666666) - 0.055
-    else:
-        return 12.92 * x
-
-
-def generate_srgb_tables():
-    print 'const float'
-    print 'util_format_srgb_8unorm_to_linear_float_table[256] = {'
-    for j in range(0, 256, 4):
-        print '   ',
-        for i in range(j, j + 4):
-            print '%.7e,' % (srgb_to_linear(i / 255.0),),
-        print
-    print '};'
-    print
-    print 'const uint8_t'
-    print 'util_format_srgb_to_linear_8unorm_table[256] = {'
-    for j in range(0, 256, 16):
-        print '   ',
-        for i in range(j, j + 16):
-            print '%3u,' % (int(srgb_to_linear(i / 255.0) * 255.0 + 0.5),),
-        print
-    print '};'
-    print
-    print 'const uint8_t'
-    print 'util_format_linear_to_srgb_8unorm_table[256] = {'
-    for j in range(0, 256, 16):
-        print '   ',
-        for i in range(j, j + 16):
-            print '%3u,' % (int(linear_to_srgb(i / 255.0) * 255.0 + 0.5),),
-        print
-    print '};'
-    print
-
-# calculate the table interpolation values used in float linear to unorm8 srgb
-    numexp = 13
-    mantissa_msb = 3
-# stepshift is just used to only use every x-th float to make things faster,
-# 5 is largest value which still gives exact same table as 0
-    stepshift = 5
-    nbuckets = numexp << mantissa_msb
-    bucketsize = (1 << (23 - mantissa_msb)) >> stepshift
-    mantshift = 12
-    valtable = []
-    sum_aa = float(bucketsize)
-    sum_ab = 0.0
-    sum_bb = 0.0
-    for i in range(0, bucketsize):
-        j = (i << stepshift) >> mantshift
-        sum_ab += j
-        sum_bb += j*j
-    inv_det = 1.0 / (sum_aa * sum_bb - sum_ab * sum_ab)
-
-    for bucket in range(0, nbuckets):
-        start = ((127 - numexp) << 23) + bucket*(bucketsize << stepshift)
-        sum_a = 0.0
-        sum_b = 0.0
- 
-        for i in range(0, bucketsize):
-            j = (i << stepshift) >> mantshift
-            fint = start + (i << stepshift)
-            ffloat = struct.unpack('f', struct.pack('I', fint))[0]
-            val = linear_to_srgb(ffloat) * 255.0 + 0.5
-            sum_a += val
-            sum_b += j*val
-
-        solved_a = inv_det * (sum_bb*sum_a - sum_ab*sum_b)
-        solved_b = inv_det * (sum_aa*sum_b - sum_ab*sum_a)
-
-        scaled_a = solved_a * 65536.0 / 512.0
-        scaled_b = solved_b * 65536.0
- 
-        int_a = int(scaled_a + 0.5)
-        int_b = int(scaled_b + 0.5)
-
-        valtable.append((int_a << 16) + int_b)
-
-    print 'const unsigned'
-    print 'util_format_linear_to_srgb_helper_table[104] = {'
-
-    for j in range(0, nbuckets, 4):
-        print '   ',
-        for i in range(j, j + 4):
-            print '0x%08x,' % (valtable[i],),
-        print
-    print '};'
-    print
-
-def main():
-    print '/* This file is autogenerated by u_format_srgb.py. Do not edit directly. */'
-    print
-    # This will print the copyright message on the top of this file
-    print CopyRight.strip()
-    print
-    print '#include "u_format_srgb.h"'
-    print
-    generate_srgb_tables()    
-
-
-if __name__ == '__main__':
-    main()