forked from KolibriOS/kolibrios
259 lines
6.7 KiB
C
259 lines
6.7 KiB
C
/*
|
|
* Copyright © 2000 SuSE, Inc.
|
|
* Copyright © 1999 Keith Packard
|
|
*
|
|
* 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 name of SuSE not be used in advertising or
|
|
* publicity pertaining to distribution of the software without specific,
|
|
* written prior permission. SuSE makes no representations about the
|
|
* suitability of this software for any purpose. It is provided "as is"
|
|
* without express or implied warranty.
|
|
*
|
|
* SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
|
|
* 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.
|
|
*
|
|
* Author: Keith Packard, SuSE, Inc.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "pixman-private.h"
|
|
|
|
pixman_bool_t
|
|
pixman_multiply_overflows_int (unsigned int a,
|
|
unsigned int b)
|
|
{
|
|
return a >= INT32_MAX / b;
|
|
}
|
|
|
|
pixman_bool_t
|
|
pixman_addition_overflows_int (unsigned int a,
|
|
unsigned int b)
|
|
{
|
|
return a > INT32_MAX - b;
|
|
}
|
|
|
|
void *
|
|
pixman_malloc_ab (unsigned int a,
|
|
unsigned int b)
|
|
{
|
|
if (a >= INT32_MAX / b)
|
|
return NULL;
|
|
|
|
return malloc (a * b);
|
|
}
|
|
|
|
void *
|
|
pixman_malloc_abc (unsigned int a,
|
|
unsigned int b,
|
|
unsigned int c)
|
|
{
|
|
if (a >= INT32_MAX / b)
|
|
return NULL;
|
|
else if (a * b >= INT32_MAX / c)
|
|
return NULL;
|
|
else
|
|
return malloc (a * b * c);
|
|
}
|
|
|
|
/*
|
|
* Helper routine to expand a color component from 0 < n <= 8 bits to 16
|
|
* bits by replication.
|
|
*/
|
|
static inline uint64_t
|
|
expand16 (const uint8_t val, int nbits)
|
|
{
|
|
/* Start out with the high bit of val in the high bit of result. */
|
|
uint16_t result = (uint16_t)val << (16 - nbits);
|
|
|
|
if (nbits == 0)
|
|
return 0;
|
|
|
|
/* Copy the bits in result, doubling the number of bits each time, until
|
|
* we fill all 16 bits.
|
|
*/
|
|
while (nbits < 16)
|
|
{
|
|
result |= result >> nbits;
|
|
nbits *= 2;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* This function expands images from ARGB8 format to ARGB16. To preserve
|
|
* precision, it needs to know the original source format. For example, if the
|
|
* source was PIXMAN_x1r5g5b5 and the red component contained bits 12345, then
|
|
* the expanded value is 12345123. To correctly expand this to 16 bits, it
|
|
* should be 1234512345123451 and not 1234512312345123.
|
|
*/
|
|
void
|
|
pixman_expand (uint64_t * dst,
|
|
const uint32_t * src,
|
|
pixman_format_code_t format,
|
|
int width)
|
|
{
|
|
/*
|
|
* Determine the sizes of each component and the masks and shifts
|
|
* required to extract them from the source pixel.
|
|
*/
|
|
const int a_size = PIXMAN_FORMAT_A (format),
|
|
r_size = PIXMAN_FORMAT_R (format),
|
|
g_size = PIXMAN_FORMAT_G (format),
|
|
b_size = PIXMAN_FORMAT_B (format);
|
|
const int a_shift = 32 - a_size,
|
|
r_shift = 24 - r_size,
|
|
g_shift = 16 - g_size,
|
|
b_shift = 8 - b_size;
|
|
const uint8_t a_mask = ~(~0 << a_size),
|
|
r_mask = ~(~0 << r_size),
|
|
g_mask = ~(~0 << g_size),
|
|
b_mask = ~(~0 << b_size);
|
|
int i;
|
|
|
|
/* Start at the end so that we can do the expansion in place
|
|
* when src == dst
|
|
*/
|
|
for (i = width - 1; i >= 0; i--)
|
|
{
|
|
const uint32_t pixel = src[i];
|
|
const uint8_t a = (pixel >> a_shift) & a_mask,
|
|
r = (pixel >> r_shift) & r_mask,
|
|
g = (pixel >> g_shift) & g_mask,
|
|
b = (pixel >> b_shift) & b_mask;
|
|
const uint64_t a16 = a_size ? expand16 (a, a_size) : 0xffff,
|
|
r16 = expand16 (r, r_size),
|
|
g16 = expand16 (g, g_size),
|
|
b16 = expand16 (b, b_size);
|
|
|
|
dst[i] = a16 << 48 | r16 << 32 | g16 << 16 | b16;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Contracting is easier than expanding. We just need to truncate the
|
|
* components.
|
|
*/
|
|
void
|
|
pixman_contract (uint32_t * dst,
|
|
const uint64_t *src,
|
|
int width)
|
|
{
|
|
int i;
|
|
|
|
/* Start at the beginning so that we can do the contraction in
|
|
* place when src == dst
|
|
*/
|
|
for (i = 0; i < width; i++)
|
|
{
|
|
const uint8_t a = src[i] >> 56,
|
|
r = src[i] >> 40,
|
|
g = src[i] >> 24,
|
|
b = src[i] >> 8;
|
|
|
|
dst[i] = a << 24 | r << 16 | g << 8 | b;
|
|
}
|
|
}
|
|
|
|
#define N_TMP_BOXES (16)
|
|
|
|
pixman_bool_t
|
|
pixman_region16_copy_from_region32 (pixman_region16_t *dst,
|
|
pixman_region32_t *src)
|
|
{
|
|
int n_boxes, i;
|
|
pixman_box32_t *boxes32;
|
|
pixman_box16_t *boxes16;
|
|
pixman_bool_t retval;
|
|
|
|
boxes32 = pixman_region32_rectangles (src, &n_boxes);
|
|
|
|
boxes16 = pixman_malloc_ab (n_boxes, sizeof (pixman_box16_t));
|
|
|
|
if (!boxes16)
|
|
return FALSE;
|
|
|
|
for (i = 0; i < n_boxes; ++i)
|
|
{
|
|
boxes16[i].x1 = boxes32[i].x1;
|
|
boxes16[i].y1 = boxes32[i].y1;
|
|
boxes16[i].x2 = boxes32[i].x2;
|
|
boxes16[i].y2 = boxes32[i].y2;
|
|
}
|
|
|
|
pixman_region_fini (dst);
|
|
retval = pixman_region_init_rects (dst, boxes16, n_boxes);
|
|
free (boxes16);
|
|
return retval;
|
|
}
|
|
|
|
pixman_bool_t
|
|
pixman_region32_copy_from_region16 (pixman_region32_t *dst,
|
|
pixman_region16_t *src)
|
|
{
|
|
int n_boxes, i;
|
|
pixman_box16_t *boxes16;
|
|
pixman_box32_t *boxes32;
|
|
pixman_box32_t tmp_boxes[N_TMP_BOXES];
|
|
pixman_bool_t retval;
|
|
|
|
boxes16 = pixman_region_rectangles (src, &n_boxes);
|
|
|
|
if (n_boxes > N_TMP_BOXES)
|
|
boxes32 = pixman_malloc_ab (n_boxes, sizeof (pixman_box32_t));
|
|
else
|
|
boxes32 = tmp_boxes;
|
|
|
|
if (!boxes32)
|
|
return FALSE;
|
|
|
|
for (i = 0; i < n_boxes; ++i)
|
|
{
|
|
boxes32[i].x1 = boxes16[i].x1;
|
|
boxes32[i].y1 = boxes16[i].y1;
|
|
boxes32[i].x2 = boxes16[i].x2;
|
|
boxes32[i].y2 = boxes16[i].y2;
|
|
}
|
|
|
|
pixman_region32_fini (dst);
|
|
retval = pixman_region32_init_rects (dst, boxes32, n_boxes);
|
|
|
|
if (boxes32 != tmp_boxes)
|
|
free (boxes32);
|
|
|
|
return retval;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
|
|
void
|
|
_pixman_log_error (const char *function, const char *message)
|
|
{
|
|
static int n_messages = 0;
|
|
|
|
if (n_messages < 10)
|
|
{
|
|
fprintf (stderr,
|
|
"*** BUG ***\n"
|
|
"In %s: %s\n"
|
|
"Set a breakpoint on '_pixman_log_error' to debug\n\n",
|
|
function, message);
|
|
|
|
n_messages++;
|
|
}
|
|
}
|
|
|
|
#endif
|