Mesa (gallium-format-cleanup): util: Generate linear<-> sRGB conversion tables.
MichaŠKról
michal at kemper.freedesktop.org
Mon Mar 1 18:32:44 UTC 2010
Module: Mesa
Branch: gallium-format-cleanup
Commit: c863f30155f26d47dc45736ffbbc0e9d96009756
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=c863f30155f26d47dc45736ffbbc0e9d96009756
Author: Michal Krol <michal at vmware.com>
Date: Mon Mar 1 19:00:40 2010 +0100
util: Generate linear<->sRGB conversion tables.
---
src/gallium/auxiliary/util/u_format_access.py | 17 +++++++++++++++++
1 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/src/gallium/auxiliary/util/u_format_access.py b/src/gallium/auxiliary/util/u_format_access.py
index 1c9be1b..0042477 100644
--- a/src/gallium/auxiliary/util/u_format_access.py
+++ b/src/gallium/auxiliary/util/u_format_access.py
@@ -37,6 +37,7 @@
'''
+import math
import sys
from u_format_pack import *
@@ -94,6 +95,20 @@ def native_type(format):
assert False
+def generate_srgb_tables():
+ print 'static ubyte srgb_to_linear[256] = {'
+ for i in range(256):
+ print ' %s,' % (int(math.pow((i / 255.0 + 0.055) / 1.055, 2.4) * 255))
+ print '};'
+ print
+ print 'static ubyte linear_to_srgb[256] = {'
+ print ' 0,'
+ for i in range(1, 256):
+ print ' %s,' % (int((1.055 * math.pow(i / 255.0, 0.41666) - 0.055) * 255))
+ print '};'
+ print
+
+
def generate_format_read(format, dst_channel, dst_native_type, dst_suffix):
'''Generate the function to read pixels from a particular format'''
@@ -305,6 +320,8 @@ def main():
print '#include "u_format_pack.h"'
print
+ generate_srgb_tables()
+
type = Channel(FLOAT, False, 32)
native_type = 'float'
suffix = '4f'
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