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/*
* Copyright © 2004 David Reveman, Peter Nilsson
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the names of
* David Reveman and Peter Nilsson not be used in advertising or
* publicity pertaining to distribution of the software without
* specific, written prior permission. David Reveman and Peter Nilsson
* makes no representations about the suitability of this software for
* any purpose. It is provided "as is" without express or implied warranty.
*
* DAVID REVEMAN AND PETER NILSSON DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL DAVID REVEMAN AND
* PETER NILSSON BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA
* OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*
* Authors: David Reveman <c99drn@cs.umu.se>
* Peter Nilsson <c99pnn@cs.umu.se>
*/
#ifdef HAVE_CONFIG_H
# include "../config.h"
#endif
#include "glitzint.h"
#include <stdlib.h>
#include <string.h>
void
glitz_intersect_region (glitz_region_box_t *box1,
glitz_region_box_t *box2,
glitz_region_box_t *return_box)
{
return_box->x1 = (box1->x1 >= box2->x1)? box1->x1: box2->x1;
return_box->x2 = (box1->x2 <= box2->x2)? box1->x2: box2->x2;
return_box->y1 = (box1->y1 >= box2->y1)? box1->y1: box2->y1;
return_box->y2 = (box1->y2 <= box2->y2)? box1->y2: box2->y2;
if (return_box->x1 >= return_box->x2)
return_box->x1 = return_box->x2 = 0;
if (return_box->y1 >= return_box->y2)
return_box->y1 = return_box->y2 = 0;
}
void
glitz_union_region (glitz_region_box_t *box1,
glitz_region_box_t *box2,
glitz_region_box_t *return_box)
{
return_box->x1 = (box1->x1 <= box2->x1)? box1->x1: box2->x1;
return_box->x2 = (box1->x2 >= box2->x2)? box1->x2: box2->x2;
return_box->y1 = (box1->y1 <= box2->y1)? box1->y1: box2->y1;
return_box->y2 = (box1->y2 >= box2->y2)? box1->y2: box2->y2;
}
void
glitz_intersect_sub_pixel_region (glitz_sub_pixel_region_box_t *box1,
glitz_sub_pixel_region_box_t *box2,
glitz_sub_pixel_region_box_t *return_box)
{
return_box->x1 = (box1->x1 >= box2->x1)? box1->x1: box2->x1;
return_box->x2 = (box1->x2 <= box2->x2)? box1->x2: box2->x2;
return_box->y1 = (box1->y1 >= box2->y1)? box1->y1: box2->y1;
return_box->y2 = (box1->y2 <= box2->y2)? box1->y2: box2->y2;
if (return_box->x1 >= return_box->x2)
return_box->x1 = return_box->x2 = 0.0;
if (return_box->y1 >= return_box->y2)
return_box->y1 = return_box->y2 = 0.0;
}
void
glitz_union_sub_pixel_region (glitz_sub_pixel_region_box_t *box1,
glitz_sub_pixel_region_box_t *box2,
glitz_sub_pixel_region_box_t *return_box)
{
return_box->x1 = (box1->x1 <= box2->x1)? box1->x1: box2->x1;
return_box->x2 = (box1->x2 >= box2->x2)? box1->x2: box2->x2;
return_box->y1 = (box1->y1 <= box2->y1)? box1->y1: box2->y1;
return_box->y2 = (box1->y2 >= box2->y2)? box1->y2: box2->y2;
}
static int
big_endian (void)
{
int a = 1;
char *c;
c = (char *) &a;
if (c[0])
return 0;
else
return 1;
}
glitz_gl_enum_t
glitz_get_gl_format_from_bpp (unsigned short bpp)
{
switch (bpp) {
case 8:
return GLITZ_GL_LUMINANCE_ALPHA;
break;
case 24:
if (big_endian ())
return GLITZ_GL_RGB;
else
return GLITZ_GL_BGR;
break;
default:
return GLITZ_GL_BGRA;
break;
}
}
glitz_gl_enum_t
glitz_get_gl_data_type_from_bpp (unsigned short bpp)
{
if (bpp == 32 && big_endian ())
return GLITZ_GL_UNSIGNED_INT_8_8_8_8_REV;
else
return GLITZ_GL_UNSIGNED_BYTE;
}
static glitz_bool_t
_glitz_extension_check (const char *extensions,
const char *ext_name)
{
char *end;
char *p = (char *) extensions;
int ext_name_len = strlen (ext_name);
if (! p)
return 0;
end = p + strlen (p);
while (p < end) {
int n = strcspn (p, " ");
if ((ext_name_len == n) && (strncmp (ext_name, p, n) == 0)) {
return 1;
}
p += (n + 1);
}
return 0;
}
long int
glitz_extensions_query (const char *extensions_string,
glitz_extension_map *extensions_map)
{
long int mask = 0;
int i;
for (i = 0; extensions_map[i].name; i++)
if (_glitz_extension_check (extensions_string, extensions_map[i].name))
mask |= extensions_map[i].mask;
return mask;
}
glitz_bool_t
glitz_uint_is_power_of_two (unsigned int value)
{
unsigned int x = 1;
while (x < value)
x <<= 1;
return (x == value);
}
void
glitz_uint_to_power_of_two (unsigned int *value)
{
unsigned int x = 1;
while (x < *value)
x <<= 1;
*value = x;
}
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