mirror of
https://github.com/brl/mutter.git
synced 2024-11-29 19:40:43 -05:00
0c66431df3
memmem is a GNU libc extension that works like strstr except that the size of the needle and the haystack are passed into the function instead of using null-terminated strings. This patch adds a wrapper function called 'cogl_util_memmem' so that we can use this function. There is a configure check and if the function is not available then a fallback implementation will be used. Otherwise cogl_util_memmem is just defined to memmem. Reviewed-by: Robert Bragg <robert@linux.intel.com> (cherry picked from commit 1dd1b0a67f6238e13f7f9253fb03addada0541b7)
280 lines
8.1 KiB
C
280 lines
8.1 KiB
C
/*
|
|
* Cogl
|
|
*
|
|
* An object oriented GL/GLES Abstraction/Utility Layer
|
|
*
|
|
* Copyright (C) 2007,2008,2009,2010 Intel Corporation.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <string.h>
|
|
|
|
#include "cogl-util.h"
|
|
#include "cogl-private.h"
|
|
|
|
/*
|
|
* cogl_util_next_p2:
|
|
* @a: Value to get the next power of two
|
|
*
|
|
* Calculates the next power of two greater than or equal to @a.
|
|
*
|
|
* Return value: @a if @a is already a power of two, otherwise returns
|
|
* the next nearest power of two.
|
|
*/
|
|
int
|
|
_cogl_util_next_p2 (int a)
|
|
{
|
|
int rval = 1;
|
|
|
|
while (rval < a)
|
|
rval <<= 1;
|
|
|
|
return rval;
|
|
}
|
|
|
|
unsigned int
|
|
_cogl_util_one_at_a_time_mix (unsigned int hash)
|
|
{
|
|
hash += ( hash << 3 );
|
|
hash ^= ( hash >> 11 );
|
|
hash += ( hash << 15 );
|
|
|
|
return hash;
|
|
}
|
|
|
|
/* The 'ffs' function is part of C99 so it isn't always available */
|
|
#ifndef HAVE_FFS
|
|
|
|
int
|
|
_cogl_util_ffs (int num)
|
|
{
|
|
int i = 1;
|
|
|
|
if (num == 0)
|
|
return 0;
|
|
|
|
while ((num & 1) == 0)
|
|
{
|
|
num >>= 1;
|
|
i++;
|
|
}
|
|
|
|
return i;
|
|
}
|
|
#endif /* HAVE_FFS */
|
|
|
|
/* The 'ffsl' is non-standard but when building with GCC we'll use its
|
|
builtin instead */
|
|
#ifndef COGL_UTIL_HAVE_BUILTIN_FFSL
|
|
|
|
int
|
|
_cogl_util_ffsl_wrapper (long int num)
|
|
{
|
|
int i = 1;
|
|
|
|
if (num == 0)
|
|
return 0;
|
|
|
|
while ((num & 1) == 0)
|
|
{
|
|
num >>= 1;
|
|
i++;
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
#endif /* COGL_UTIL_HAVE_BUILTIN_FFSL */
|
|
|
|
#ifndef COGL_UTIL_HAVE_BUILTIN_POPCOUNTL
|
|
|
|
const unsigned char
|
|
_cogl_util_popcount_table[256] =
|
|
{
|
|
0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3, 2, 3, 3, 4,
|
|
2, 3, 3, 4, 3, 4, 4, 5, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
|
|
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 1, 2, 2, 3, 2, 3, 3, 4,
|
|
2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
|
|
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6,
|
|
4, 5, 5, 6, 5, 6, 6, 7, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
|
|
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5,
|
|
3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
|
|
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6,
|
|
4, 5, 5, 6, 5, 6, 6, 7, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
|
|
4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8
|
|
};
|
|
|
|
#endif /* COGL_UTIL_HAVE_BUILTIN_POPCOUNTL */
|
|
|
|
/* tests/conform/test-bitmask.c tests some cogl internals and includes this
|
|
* file directly but since these functions depend on other internal Cogl
|
|
* symbols we hide them from test-bitmask.c
|
|
*
|
|
* XXX: maybe there's a better way for us to handle internal testing
|
|
* to avoid needing hacks like this.
|
|
*/
|
|
#ifndef _COGL_IN_TEST_BITMASK
|
|
|
|
/* Given a set of red, green and blue component masks, a depth and
|
|
* bits per pixel this function tries to determine a corresponding
|
|
* CoglPixelFormat.
|
|
*
|
|
* The depth is measured in bits not including padding for un-used
|
|
* alpha. The bits per pixel (bpp) does include padding for un-used
|
|
* alpha.
|
|
*
|
|
* This function firstly aims to match formats with RGB ordered
|
|
* components and only considers alpha coming first, in the most
|
|
* significant bits. If the function fails to match then it recurses
|
|
* by either switching the r and b masks around to check for BGR
|
|
* ordered formats or it recurses with the masks shifted to check for
|
|
* formats where the alpha component is the least significant bits.
|
|
*/
|
|
static CoglPixelFormat
|
|
_cogl_util_pixel_format_from_masks_real (unsigned long r_mask,
|
|
unsigned long g_mask,
|
|
unsigned long b_mask,
|
|
int depth, int bpp,
|
|
CoglBool check_bgr,
|
|
CoglBool check_afirst,
|
|
int recursion_depth)
|
|
{
|
|
CoglPixelFormat image_format;
|
|
|
|
if (depth == 24 && bpp == 24 &&
|
|
r_mask == 0xff0000 && g_mask == 0xff00 && b_mask == 0xff)
|
|
{
|
|
return COGL_PIXEL_FORMAT_RGB_888;
|
|
}
|
|
else if ((depth == 24 || depth == 32) && bpp == 32 &&
|
|
r_mask == 0xff0000 && g_mask == 0xff00 && b_mask == 0xff)
|
|
{
|
|
return COGL_PIXEL_FORMAT_ARGB_8888_PRE;
|
|
}
|
|
else if ((depth == 30 || depth == 32) &&
|
|
r_mask == 0x3ff00000 && g_mask == 0xffc00 && b_mask == 0x3ff)
|
|
{
|
|
return COGL_PIXEL_FORMAT_ARGB_2101010_PRE;
|
|
}
|
|
else if (depth == 16 && bpp == 16 &&
|
|
r_mask == 0xf800 && g_mask == 0x7e0 && b_mask == 0x1f)
|
|
{
|
|
return COGL_PIXEL_FORMAT_RGB_565;
|
|
}
|
|
|
|
if (recursion_depth == 2)
|
|
return 0;
|
|
|
|
/* Check for BGR ordering if we didn't find a match */
|
|
if (check_bgr)
|
|
{
|
|
image_format =
|
|
_cogl_util_pixel_format_from_masks_real (b_mask, g_mask, r_mask,
|
|
depth, bpp,
|
|
FALSE,
|
|
TRUE,
|
|
recursion_depth + 1);
|
|
if (image_format)
|
|
return image_format ^ COGL_BGR_BIT;
|
|
}
|
|
|
|
/* Check for alpha in the least significant bits if we still
|
|
* haven't found a match... */
|
|
if (check_afirst && depth != bpp)
|
|
{
|
|
int shift = bpp - depth;
|
|
|
|
image_format =
|
|
_cogl_util_pixel_format_from_masks_real (r_mask >> shift,
|
|
g_mask >> shift,
|
|
b_mask >> shift,
|
|
depth, bpp,
|
|
TRUE,
|
|
FALSE,
|
|
recursion_depth + 1);
|
|
if (image_format)
|
|
return image_format ^ COGL_AFIRST_BIT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
CoglPixelFormat
|
|
_cogl_util_pixel_format_from_masks (unsigned long r_mask,
|
|
unsigned long g_mask,
|
|
unsigned long b_mask,
|
|
int depth, int bpp,
|
|
CoglBool byte_order_is_lsb_first)
|
|
{
|
|
CoglPixelFormat image_format =
|
|
_cogl_util_pixel_format_from_masks_real (r_mask, g_mask, b_mask,
|
|
depth, bpp,
|
|
TRUE,
|
|
TRUE,
|
|
0);
|
|
|
|
if (!image_format)
|
|
{
|
|
const char *byte_order[] = { "MSB first", "LSB first" };
|
|
g_warning ("Could not find a matching pixel format for red mask=0x%lx,"
|
|
"green mask=0x%lx, blue mask=0x%lx at depth=%d, bpp=%d "
|
|
"and byte order=%s\n", r_mask, g_mask, b_mask, depth, bpp,
|
|
byte_order[!!byte_order_is_lsb_first]);
|
|
return 0;
|
|
}
|
|
|
|
/* If the image is in little-endian then the order in memory is
|
|
reversed */
|
|
if (byte_order_is_lsb_first &&
|
|
_cogl_pixel_format_is_endian_dependant (image_format))
|
|
{
|
|
image_format ^= COGL_BGR_BIT;
|
|
if (image_format & COGL_A_BIT)
|
|
image_format ^= COGL_AFIRST_BIT;
|
|
}
|
|
|
|
return image_format;
|
|
}
|
|
|
|
#ifndef HAVE_MEMMEM
|
|
|
|
char *
|
|
_cogl_util_memmem (const void *haystack,
|
|
size_t haystack_len,
|
|
const void *needle,
|
|
size_t needle_len)
|
|
{
|
|
size_t i;
|
|
|
|
if (needle_len > haystack_len)
|
|
return NULL;
|
|
|
|
for (i = 0; i <= haystack_len - needle_len; i++)
|
|
if (!memcmp ((const char *) haystack + i, needle, needle_len))
|
|
return (char *) haystack + i;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
#endif /* HAVE_MEMMEM */
|
|
|
|
#endif /* _COGL_IN_TEST_BITMASK */
|