0,0 → 1,310 |
/* |
* 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_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 (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) |
{ |
uint8_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; |
} |
|
#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; |
} |
|
/* 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++; |
} |
} |