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