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/*
* 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 <pixman-config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include "pixman-private.h"
pixman_bool_t
_pixman_multiply_overflows_size (size_t a, size_t b)
{
return a >= SIZE_MAX / b;
}
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_plus_c (unsigned int a, unsigned int b, unsigned int c)
{
if (!b || a >= INT32_MAX / b || (a * b) > INT32_MAX - c)
return NULL;
return malloc (a * b + c);
}
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);
}
static force_inline uint16_t
float_to_unorm (float f, int n_bits)
{
uint32_t u;
if (f > 1.0)
f = 1.0;
if (f < 0.0)
f = 0.0;
u = f * (1 << n_bits);
u -= (u >> n_bits);
return u;
}
static force_inline float
unorm_to_float (uint16_t u, int n_bits)
{
uint32_t m = ((1 << n_bits) - 1);
return (u & m) * (1.f / (float)m);
}
/*
* This function expands images from a8r8g8b8 to argb_t. To preserve
* precision, it needs to know from which source format the a8r8g8b8 pixels
* originally came.
*
* For example, if the source was PIXMAN_x1r5g5b5 and the red component
* contained bits 12345, then the 8-bit value is 12345123. To correctly
* expand this to floating point, it should be 12345 / 31.0 and not
* 12345123 / 255.0.
*/
void
pixman_expand_to_float (argb_t *dst,
const uint32_t *src,
pixman_format_code_t format,
int width)
{
static const float multipliers[16] = {
0.0f,
1.0f / ((1 << 1) - 1),
1.0f / ((1 << 2) - 1),
1.0f / ((1 << 3) - 1),
1.0f / ((1 << 4) - 1),
1.0f / ((1 << 5) - 1),
1.0f / ((1 << 6) - 1),
1.0f / ((1 << 7) - 1),
1.0f / ((1 << 8) - 1),
1.0f / ((1 << 9) - 1),
1.0f / ((1 << 10) - 1),
1.0f / ((1 << 11) - 1),
1.0f / ((1 << 12) - 1),
1.0f / ((1 << 13) - 1),
1.0f / ((1 << 14) - 1),
1.0f / ((1 << 15) - 1),
};
int a_size, r_size, g_size, b_size;
int a_shift, r_shift, g_shift, b_shift;
float a_mul, r_mul, g_mul, b_mul;
uint32_t a_mask, r_mask, g_mask, b_mask;
int i;
if (!PIXMAN_FORMAT_VIS (format))
format = PIXMAN_a8r8g8b8;
/*
* Determine the sizes of each component and the masks and shifts
* required to extract them from the source pixel.
*/
a_size = PIXMAN_FORMAT_A (format);
r_size = PIXMAN_FORMAT_R (format);
g_size = PIXMAN_FORMAT_G (format);
b_size = PIXMAN_FORMAT_B (format);
a_shift = 32 - a_size;
r_shift = 24 - r_size;
g_shift = 16 - g_size;
b_shift = 8 - b_size;
a_mask = ((1 << a_size) - 1);
r_mask = ((1 << r_size) - 1);
g_mask = ((1 << g_size) - 1);
b_mask = ((1 << b_size) - 1);
a_mul = multipliers[a_size];
r_mul = multipliers[r_size];
g_mul = multipliers[g_size];
b_mul = multipliers[b_size];
/* 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];
dst[i].a = a_mask? ((pixel >> a_shift) & a_mask) * a_mul : 1.0f;
dst[i].r = ((pixel >> r_shift) & r_mask) * r_mul;
dst[i].g = ((pixel >> g_shift) & g_mask) * g_mul;
dst[i].b = ((pixel >> b_shift) & b_mask) * b_mul;
}
}
uint16_t
pixman_float_to_unorm (float f, int n_bits)
{
return float_to_unorm (f, n_bits);
}
float
pixman_unorm_to_float (uint16_t u, int n_bits)
{
return unorm_to_float (u, n_bits);
}
void
pixman_contract_from_float (uint32_t *dst,
const argb_t *src,
int width)
{
int i;
for (i = 0; i < width; ++i)
{
uint32_t a, r, g, b;
a = float_to_unorm (src[i].a, 8);
r = float_to_unorm (src[i].r, 8);
g = float_to_unorm (src[i].g, 8);
b = float_to_unorm (src[i].b, 8);
dst[i] = (a << 24) | (r << 16) | (g << 8) | (b << 0);
}
}
uint32_t *
_pixman_iter_get_scanline_noop (pixman_iter_t *iter, const uint32_t *mask)
{
return iter->buffer;
}
void
_pixman_iter_init_bits_stride (pixman_iter_t *iter, const pixman_iter_info_t *info)
{
pixman_image_t *image = iter->image;
uint8_t *b = (uint8_t *)image->bits.bits;
int s = image->bits.rowstride * 4;
iter->bits = b + s * iter->y + iter->x * PIXMAN_FORMAT_BPP (info->format) / 8;
iter->stride = s;
}
#define N_TMP_BOXES (16)
pixman_bool_t
pixman_region16_copy_from_region32 (pixman_region16_t *dst,
const 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,
const 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;
}
/* This function is exported for the sake of the test suite and not part
* of the ABI.
*/
PIXMAN_EXPORT pixman_implementation_t *
_pixman_internal_only_get_implementation (void)
{
return get_implementation ();
}
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++;
}
}