forked from KolibriOS/kolibrios
769 lines
18 KiB
C
769 lines
18 KiB
C
/*
|
|
* Copyright © 2008 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 the copyright holders not be used in advertising or
|
|
* publicity pertaining to distribution of the software without specific,
|
|
* written prior permission. The copyright holders make no representations
|
|
* about the suitability of this software for any purpose. It is provided "as
|
|
* is" without express or implied warranty.
|
|
*
|
|
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
|
|
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
|
|
* EVENT SHALL THE COPYRIGHT HOLDERS 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.
|
|
*/
|
|
|
|
/*
|
|
* Matrix interfaces
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <math.h>
|
|
#include <string.h>
|
|
#include "pixman-private.h"
|
|
|
|
#define F(x) pixman_int_to_fixed (x)
|
|
|
|
PIXMAN_EXPORT void
|
|
pixman_transform_init_identity (struct pixman_transform *matrix)
|
|
{
|
|
int i;
|
|
|
|
memset (matrix, '\0', sizeof (struct pixman_transform));
|
|
for (i = 0; i < 3; i++)
|
|
matrix->matrix[i][i] = F (1);
|
|
}
|
|
|
|
typedef pixman_fixed_32_32_t pixman_fixed_34_30_t;
|
|
|
|
PIXMAN_EXPORT pixman_bool_t
|
|
pixman_transform_point_3d (const struct pixman_transform *transform,
|
|
struct pixman_vector * vector)
|
|
{
|
|
struct pixman_vector result;
|
|
pixman_fixed_32_32_t partial;
|
|
pixman_fixed_48_16_t v;
|
|
int i, j;
|
|
|
|
for (j = 0; j < 3; j++)
|
|
{
|
|
v = 0;
|
|
for (i = 0; i < 3; i++)
|
|
{
|
|
partial = ((pixman_fixed_48_16_t) transform->matrix[j][i] *
|
|
(pixman_fixed_48_16_t) vector->vector[i]);
|
|
v += partial >> 16;
|
|
}
|
|
|
|
if (v > pixman_max_fixed_48_16 || v < pixman_min_fixed_48_16)
|
|
return FALSE;
|
|
|
|
result.vector[j] = (pixman_fixed_t) v;
|
|
}
|
|
|
|
*vector = result;
|
|
|
|
if (!result.vector[2])
|
|
return FALSE;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
PIXMAN_EXPORT pixman_bool_t
|
|
pixman_transform_point (const struct pixman_transform *transform,
|
|
struct pixman_vector * vector)
|
|
{
|
|
pixman_fixed_32_32_t partial;
|
|
pixman_fixed_34_30_t v[3];
|
|
pixman_fixed_48_16_t quo;
|
|
int i, j;
|
|
|
|
for (j = 0; j < 3; j++)
|
|
{
|
|
v[j] = 0;
|
|
|
|
for (i = 0; i < 3; i++)
|
|
{
|
|
partial = ((pixman_fixed_32_32_t) transform->matrix[j][i] *
|
|
(pixman_fixed_32_32_t) vector->vector[i]);
|
|
v[j] += partial >> 2;
|
|
}
|
|
}
|
|
|
|
if (!(v[2] >> 16))
|
|
return FALSE;
|
|
|
|
for (j = 0; j < 2; j++)
|
|
{
|
|
quo = v[j] / (v[2] >> 16);
|
|
if (quo > pixman_max_fixed_48_16 || quo < pixman_min_fixed_48_16)
|
|
return FALSE;
|
|
vector->vector[j] = (pixman_fixed_t) quo;
|
|
}
|
|
|
|
vector->vector[2] = pixman_fixed_1;
|
|
return TRUE;
|
|
}
|
|
|
|
PIXMAN_EXPORT pixman_bool_t
|
|
pixman_transform_multiply (struct pixman_transform * dst,
|
|
const struct pixman_transform *l,
|
|
const struct pixman_transform *r)
|
|
{
|
|
struct pixman_transform d;
|
|
int dx, dy;
|
|
int o;
|
|
|
|
for (dy = 0; dy < 3; dy++)
|
|
{
|
|
for (dx = 0; dx < 3; dx++)
|
|
{
|
|
pixman_fixed_48_16_t v;
|
|
pixman_fixed_32_32_t partial;
|
|
|
|
v = 0;
|
|
for (o = 0; o < 3; o++)
|
|
{
|
|
partial =
|
|
(pixman_fixed_32_32_t) l->matrix[dy][o] *
|
|
(pixman_fixed_32_32_t) r->matrix[o][dx];
|
|
|
|
v += partial >> 16;
|
|
}
|
|
|
|
if (v > pixman_max_fixed_48_16 || v < pixman_min_fixed_48_16)
|
|
return FALSE;
|
|
|
|
d.matrix[dy][dx] = (pixman_fixed_t) v;
|
|
}
|
|
}
|
|
|
|
*dst = d;
|
|
return TRUE;
|
|
}
|
|
|
|
PIXMAN_EXPORT void
|
|
pixman_transform_init_scale (struct pixman_transform *t,
|
|
pixman_fixed_t sx,
|
|
pixman_fixed_t sy)
|
|
{
|
|
memset (t, '\0', sizeof (struct pixman_transform));
|
|
|
|
t->matrix[0][0] = sx;
|
|
t->matrix[1][1] = sy;
|
|
t->matrix[2][2] = F (1);
|
|
}
|
|
|
|
static pixman_fixed_t
|
|
fixed_inverse (pixman_fixed_t x)
|
|
{
|
|
return (pixman_fixed_t) ((((pixman_fixed_48_16_t) F (1)) * F (1)) / x);
|
|
}
|
|
|
|
PIXMAN_EXPORT pixman_bool_t
|
|
pixman_transform_scale (struct pixman_transform *forward,
|
|
struct pixman_transform *reverse,
|
|
pixman_fixed_t sx,
|
|
pixman_fixed_t sy)
|
|
{
|
|
struct pixman_transform t;
|
|
|
|
if (sx == 0 || sy == 0)
|
|
return FALSE;
|
|
|
|
if (forward)
|
|
{
|
|
pixman_transform_init_scale (&t, sx, sy);
|
|
if (!pixman_transform_multiply (forward, &t, forward))
|
|
return FALSE;
|
|
}
|
|
|
|
if (reverse)
|
|
{
|
|
pixman_transform_init_scale (&t, fixed_inverse (sx),
|
|
fixed_inverse (sy));
|
|
if (!pixman_transform_multiply (reverse, reverse, &t))
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
PIXMAN_EXPORT void
|
|
pixman_transform_init_rotate (struct pixman_transform *t,
|
|
pixman_fixed_t c,
|
|
pixman_fixed_t s)
|
|
{
|
|
memset (t, '\0', sizeof (struct pixman_transform));
|
|
|
|
t->matrix[0][0] = c;
|
|
t->matrix[0][1] = -s;
|
|
t->matrix[1][0] = s;
|
|
t->matrix[1][1] = c;
|
|
t->matrix[2][2] = F (1);
|
|
}
|
|
|
|
PIXMAN_EXPORT pixman_bool_t
|
|
pixman_transform_rotate (struct pixman_transform *forward,
|
|
struct pixman_transform *reverse,
|
|
pixman_fixed_t c,
|
|
pixman_fixed_t s)
|
|
{
|
|
struct pixman_transform t;
|
|
|
|
if (forward)
|
|
{
|
|
pixman_transform_init_rotate (&t, c, s);
|
|
if (!pixman_transform_multiply (forward, &t, forward))
|
|
return FALSE;
|
|
}
|
|
|
|
if (reverse)
|
|
{
|
|
pixman_transform_init_rotate (&t, c, -s);
|
|
if (!pixman_transform_multiply (reverse, reverse, &t))
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
PIXMAN_EXPORT void
|
|
pixman_transform_init_translate (struct pixman_transform *t,
|
|
pixman_fixed_t tx,
|
|
pixman_fixed_t ty)
|
|
{
|
|
memset (t, '\0', sizeof (struct pixman_transform));
|
|
|
|
t->matrix[0][0] = F (1);
|
|
t->matrix[0][2] = tx;
|
|
t->matrix[1][1] = F (1);
|
|
t->matrix[1][2] = ty;
|
|
t->matrix[2][2] = F (1);
|
|
}
|
|
|
|
PIXMAN_EXPORT pixman_bool_t
|
|
pixman_transform_translate (struct pixman_transform *forward,
|
|
struct pixman_transform *reverse,
|
|
pixman_fixed_t tx,
|
|
pixman_fixed_t ty)
|
|
{
|
|
struct pixman_transform t;
|
|
|
|
if (forward)
|
|
{
|
|
pixman_transform_init_translate (&t, tx, ty);
|
|
|
|
if (!pixman_transform_multiply (forward, &t, forward))
|
|
return FALSE;
|
|
}
|
|
|
|
if (reverse)
|
|
{
|
|
pixman_transform_init_translate (&t, -tx, -ty);
|
|
|
|
if (!pixman_transform_multiply (reverse, reverse, &t))
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
PIXMAN_EXPORT pixman_bool_t
|
|
pixman_transform_bounds (const struct pixman_transform *matrix,
|
|
struct pixman_box16 * b)
|
|
|
|
{
|
|
struct pixman_vector v[4];
|
|
int i;
|
|
int x1, y1, x2, y2;
|
|
|
|
v[0].vector[0] = F (b->x1);
|
|
v[0].vector[1] = F (b->y1);
|
|
v[0].vector[2] = F (1);
|
|
|
|
v[1].vector[0] = F (b->x2);
|
|
v[1].vector[1] = F (b->y1);
|
|
v[1].vector[2] = F (1);
|
|
|
|
v[2].vector[0] = F (b->x2);
|
|
v[2].vector[1] = F (b->y2);
|
|
v[2].vector[2] = F (1);
|
|
|
|
v[3].vector[0] = F (b->x1);
|
|
v[3].vector[1] = F (b->y2);
|
|
v[3].vector[2] = F (1);
|
|
|
|
for (i = 0; i < 4; i++)
|
|
{
|
|
if (!pixman_transform_point (matrix, &v[i]))
|
|
return FALSE;
|
|
|
|
x1 = pixman_fixed_to_int (v[i].vector[0]);
|
|
y1 = pixman_fixed_to_int (v[i].vector[1]);
|
|
x2 = pixman_fixed_to_int (pixman_fixed_ceil (v[i].vector[0]));
|
|
y2 = pixman_fixed_to_int (pixman_fixed_ceil (v[i].vector[1]));
|
|
|
|
if (i == 0)
|
|
{
|
|
b->x1 = x1;
|
|
b->y1 = y1;
|
|
b->x2 = x2;
|
|
b->y2 = y2;
|
|
}
|
|
else
|
|
{
|
|
if (x1 < b->x1) b->x1 = x1;
|
|
if (y1 < b->y1) b->y1 = y1;
|
|
if (x2 > b->x2) b->x2 = x2;
|
|
if (y2 > b->y2) b->y2 = y2;
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
PIXMAN_EXPORT pixman_bool_t
|
|
pixman_transform_invert (struct pixman_transform * dst,
|
|
const struct pixman_transform *src)
|
|
{
|
|
struct pixman_f_transform m, r;
|
|
|
|
pixman_f_transform_from_pixman_transform (&m, src);
|
|
|
|
if (!pixman_f_transform_invert (&r, &m))
|
|
return FALSE;
|
|
|
|
if (!pixman_transform_from_pixman_f_transform (dst, &r))
|
|
return FALSE;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static pixman_bool_t
|
|
within_epsilon (pixman_fixed_t a,
|
|
pixman_fixed_t b,
|
|
pixman_fixed_t epsilon)
|
|
{
|
|
pixman_fixed_t t = a - b;
|
|
|
|
if (t < 0)
|
|
t = -t;
|
|
|
|
return t <= epsilon;
|
|
}
|
|
|
|
#define EPSILON (pixman_fixed_t) (2)
|
|
|
|
#define IS_SAME(a, b) (within_epsilon (a, b, EPSILON))
|
|
#define IS_ZERO(a) (within_epsilon (a, 0, EPSILON))
|
|
#define IS_ONE(a) (within_epsilon (a, F (1), EPSILON))
|
|
#define IS_UNIT(a) \
|
|
(within_epsilon (a, F (1), EPSILON) || \
|
|
within_epsilon (a, F (-1), EPSILON) || \
|
|
IS_ZERO (a))
|
|
#define IS_INT(a) (IS_ZERO (pixman_fixed_frac (a)))
|
|
|
|
PIXMAN_EXPORT pixman_bool_t
|
|
pixman_transform_is_identity (const struct pixman_transform *t)
|
|
{
|
|
return (IS_SAME (t->matrix[0][0], t->matrix[1][1]) &&
|
|
IS_SAME (t->matrix[0][0], t->matrix[2][2]) &&
|
|
!IS_ZERO (t->matrix[0][0]) &&
|
|
IS_ZERO (t->matrix[0][1]) &&
|
|
IS_ZERO (t->matrix[0][2]) &&
|
|
IS_ZERO (t->matrix[1][0]) &&
|
|
IS_ZERO (t->matrix[1][2]) &&
|
|
IS_ZERO (t->matrix[2][0]) &&
|
|
IS_ZERO (t->matrix[2][1]));
|
|
}
|
|
|
|
PIXMAN_EXPORT pixman_bool_t
|
|
pixman_transform_is_scale (const struct pixman_transform *t)
|
|
{
|
|
return (!IS_ZERO (t->matrix[0][0]) &&
|
|
IS_ZERO (t->matrix[0][1]) &&
|
|
IS_ZERO (t->matrix[0][2]) &&
|
|
|
|
IS_ZERO (t->matrix[1][0]) &&
|
|
!IS_ZERO (t->matrix[1][1]) &&
|
|
IS_ZERO (t->matrix[1][2]) &&
|
|
|
|
IS_ZERO (t->matrix[2][0]) &&
|
|
IS_ZERO (t->matrix[2][1]) &&
|
|
!IS_ZERO (t->matrix[2][2]));
|
|
}
|
|
|
|
PIXMAN_EXPORT pixman_bool_t
|
|
pixman_transform_is_int_translate (const struct pixman_transform *t)
|
|
{
|
|
return (IS_ONE (t->matrix[0][0]) &&
|
|
IS_ZERO (t->matrix[0][1]) &&
|
|
IS_INT (t->matrix[0][2]) &&
|
|
|
|
IS_ZERO (t->matrix[1][0]) &&
|
|
IS_ONE (t->matrix[1][1]) &&
|
|
IS_INT (t->matrix[1][2]) &&
|
|
|
|
IS_ZERO (t->matrix[2][0]) &&
|
|
IS_ZERO (t->matrix[2][1]) &&
|
|
IS_ONE (t->matrix[2][2]));
|
|
}
|
|
|
|
PIXMAN_EXPORT pixman_bool_t
|
|
pixman_transform_is_inverse (const struct pixman_transform *a,
|
|
const struct pixman_transform *b)
|
|
{
|
|
struct pixman_transform t;
|
|
|
|
pixman_transform_multiply (&t, a, b);
|
|
|
|
return pixman_transform_is_identity (&t);
|
|
}
|
|
|
|
PIXMAN_EXPORT void
|
|
pixman_f_transform_from_pixman_transform (struct pixman_f_transform * ft,
|
|
const struct pixman_transform *t)
|
|
{
|
|
int i, j;
|
|
|
|
for (j = 0; j < 3; j++)
|
|
{
|
|
for (i = 0; i < 3; i++)
|
|
ft->m[j][i] = pixman_fixed_to_double (t->matrix[j][i]);
|
|
}
|
|
}
|
|
|
|
PIXMAN_EXPORT pixman_bool_t
|
|
pixman_transform_from_pixman_f_transform (struct pixman_transform * t,
|
|
const struct pixman_f_transform *ft)
|
|
{
|
|
int i, j;
|
|
|
|
for (j = 0; j < 3; j++)
|
|
{
|
|
for (i = 0; i < 3; i++)
|
|
{
|
|
double d = ft->m[j][i];
|
|
if (d < -32767.0 || d > 32767.0)
|
|
return FALSE;
|
|
d = d * 65536.0 + 0.5;
|
|
t->matrix[j][i] = (pixman_fixed_t) floor (d);
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static const int a[3] = { 3, 3, 2 };
|
|
static const int b[3] = { 2, 1, 1 };
|
|
|
|
PIXMAN_EXPORT pixman_bool_t
|
|
pixman_f_transform_invert (struct pixman_f_transform * dst,
|
|
const struct pixman_f_transform *src)
|
|
{
|
|
double det;
|
|
int i, j;
|
|
static int a[3] = { 2, 2, 1 };
|
|
static int b[3] = { 1, 0, 0 };
|
|
|
|
det = 0;
|
|
for (i = 0; i < 3; i++)
|
|
{
|
|
double p;
|
|
int ai = a[i];
|
|
int bi = b[i];
|
|
p = src->m[i][0] * (src->m[ai][2] * src->m[bi][1] -
|
|
src->m[ai][1] * src->m[bi][2]);
|
|
if (i == 1)
|
|
p = -p;
|
|
det += p;
|
|
}
|
|
|
|
if (det == 0)
|
|
return FALSE;
|
|
|
|
det = 1 / det;
|
|
for (j = 0; j < 3; j++)
|
|
{
|
|
for (i = 0; i < 3; i++)
|
|
{
|
|
double p;
|
|
int ai = a[i];
|
|
int aj = a[j];
|
|
int bi = b[i];
|
|
int bj = b[j];
|
|
|
|
p = (src->m[ai][aj] * src->m[bi][bj] -
|
|
src->m[ai][bj] * src->m[bi][aj]);
|
|
|
|
if (((i + j) & 1) != 0)
|
|
p = -p;
|
|
|
|
dst->m[j][i] = det * p;
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
PIXMAN_EXPORT pixman_bool_t
|
|
pixman_f_transform_point (const struct pixman_f_transform *t,
|
|
struct pixman_f_vector * v)
|
|
{
|
|
struct pixman_f_vector result;
|
|
int i, j;
|
|
double a;
|
|
|
|
for (j = 0; j < 3; j++)
|
|
{
|
|
a = 0;
|
|
for (i = 0; i < 3; i++)
|
|
a += t->m[j][i] * v->v[i];
|
|
result.v[j] = a;
|
|
}
|
|
|
|
if (!result.v[2])
|
|
return FALSE;
|
|
|
|
for (j = 0; j < 2; j++)
|
|
v->v[j] = result.v[j] / result.v[2];
|
|
|
|
v->v[2] = 1;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
PIXMAN_EXPORT void
|
|
pixman_f_transform_point_3d (const struct pixman_f_transform *t,
|
|
struct pixman_f_vector * v)
|
|
{
|
|
struct pixman_f_vector result;
|
|
int i, j;
|
|
double a;
|
|
|
|
for (j = 0; j < 3; j++)
|
|
{
|
|
a = 0;
|
|
for (i = 0; i < 3; i++)
|
|
a += t->m[j][i] * v->v[i];
|
|
result.v[j] = a;
|
|
}
|
|
|
|
*v = result;
|
|
}
|
|
|
|
PIXMAN_EXPORT void
|
|
pixman_f_transform_multiply (struct pixman_f_transform * dst,
|
|
const struct pixman_f_transform *l,
|
|
const struct pixman_f_transform *r)
|
|
{
|
|
struct pixman_f_transform d;
|
|
int dx, dy;
|
|
int o;
|
|
|
|
for (dy = 0; dy < 3; dy++)
|
|
{
|
|
for (dx = 0; dx < 3; dx++)
|
|
{
|
|
double v = 0;
|
|
for (o = 0; o < 3; o++)
|
|
v += l->m[dy][o] * r->m[o][dx];
|
|
d.m[dy][dx] = v;
|
|
}
|
|
}
|
|
|
|
*dst = d;
|
|
}
|
|
|
|
PIXMAN_EXPORT void
|
|
pixman_f_transform_init_scale (struct pixman_f_transform *t,
|
|
double sx,
|
|
double sy)
|
|
{
|
|
t->m[0][0] = sx;
|
|
t->m[0][1] = 0;
|
|
t->m[0][2] = 0;
|
|
t->m[1][0] = 0;
|
|
t->m[1][1] = sy;
|
|
t->m[1][2] = 0;
|
|
t->m[2][0] = 0;
|
|
t->m[2][1] = 0;
|
|
t->m[2][2] = 1;
|
|
}
|
|
|
|
PIXMAN_EXPORT pixman_bool_t
|
|
pixman_f_transform_scale (struct pixman_f_transform *forward,
|
|
struct pixman_f_transform *reverse,
|
|
double sx,
|
|
double sy)
|
|
{
|
|
struct pixman_f_transform t;
|
|
|
|
if (sx == 0 || sy == 0)
|
|
return FALSE;
|
|
|
|
if (forward)
|
|
{
|
|
pixman_f_transform_init_scale (&t, sx, sy);
|
|
pixman_f_transform_multiply (forward, &t, forward);
|
|
}
|
|
|
|
if (reverse)
|
|
{
|
|
pixman_f_transform_init_scale (&t, 1 / sx, 1 / sy);
|
|
pixman_f_transform_multiply (reverse, reverse, &t);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
PIXMAN_EXPORT void
|
|
pixman_f_transform_init_rotate (struct pixman_f_transform *t,
|
|
double c,
|
|
double s)
|
|
{
|
|
t->m[0][0] = c;
|
|
t->m[0][1] = -s;
|
|
t->m[0][2] = 0;
|
|
t->m[1][0] = s;
|
|
t->m[1][1] = c;
|
|
t->m[1][2] = 0;
|
|
t->m[2][0] = 0;
|
|
t->m[2][1] = 0;
|
|
t->m[2][2] = 1;
|
|
}
|
|
|
|
PIXMAN_EXPORT pixman_bool_t
|
|
pixman_f_transform_rotate (struct pixman_f_transform *forward,
|
|
struct pixman_f_transform *reverse,
|
|
double c,
|
|
double s)
|
|
{
|
|
struct pixman_f_transform t;
|
|
|
|
if (forward)
|
|
{
|
|
pixman_f_transform_init_rotate (&t, c, s);
|
|
pixman_f_transform_multiply (forward, &t, forward);
|
|
}
|
|
|
|
if (reverse)
|
|
{
|
|
pixman_f_transform_init_rotate (&t, c, -s);
|
|
pixman_f_transform_multiply (reverse, reverse, &t);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
PIXMAN_EXPORT void
|
|
pixman_f_transform_init_translate (struct pixman_f_transform *t,
|
|
double tx,
|
|
double ty)
|
|
{
|
|
t->m[0][0] = 1;
|
|
t->m[0][1] = 0;
|
|
t->m[0][2] = tx;
|
|
t->m[1][0] = 0;
|
|
t->m[1][1] = 1;
|
|
t->m[1][2] = ty;
|
|
t->m[2][0] = 0;
|
|
t->m[2][1] = 0;
|
|
t->m[2][2] = 1;
|
|
}
|
|
|
|
PIXMAN_EXPORT pixman_bool_t
|
|
pixman_f_transform_translate (struct pixman_f_transform *forward,
|
|
struct pixman_f_transform *reverse,
|
|
double tx,
|
|
double ty)
|
|
{
|
|
struct pixman_f_transform t;
|
|
|
|
if (forward)
|
|
{
|
|
pixman_f_transform_init_translate (&t, tx, ty);
|
|
pixman_f_transform_multiply (forward, &t, forward);
|
|
}
|
|
|
|
if (reverse)
|
|
{
|
|
pixman_f_transform_init_translate (&t, -tx, -ty);
|
|
pixman_f_transform_multiply (reverse, reverse, &t);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
PIXMAN_EXPORT pixman_bool_t
|
|
pixman_f_transform_bounds (const struct pixman_f_transform *t,
|
|
struct pixman_box16 * b)
|
|
{
|
|
struct pixman_f_vector v[4];
|
|
int i;
|
|
int x1, y1, x2, y2;
|
|
|
|
v[0].v[0] = b->x1;
|
|
v[0].v[1] = b->y1;
|
|
v[0].v[2] = 1;
|
|
v[1].v[0] = b->x2;
|
|
v[1].v[1] = b->y1;
|
|
v[1].v[2] = 1;
|
|
v[2].v[0] = b->x2;
|
|
v[2].v[1] = b->y2;
|
|
v[2].v[2] = 1;
|
|
v[3].v[0] = b->x1;
|
|
v[3].v[1] = b->y2;
|
|
v[3].v[2] = 1;
|
|
|
|
for (i = 0; i < 4; i++)
|
|
{
|
|
if (!pixman_f_transform_point (t, &v[i]))
|
|
return FALSE;
|
|
|
|
x1 = floor (v[i].v[0]);
|
|
y1 = floor (v[i].v[1]);
|
|
x2 = ceil (v[i].v[0]);
|
|
y2 = ceil (v[i].v[1]);
|
|
|
|
if (i == 0)
|
|
{
|
|
b->x1 = x1;
|
|
b->y1 = y1;
|
|
b->x2 = x2;
|
|
b->y2 = y2;
|
|
}
|
|
else
|
|
{
|
|
if (x1 < b->x1) b->x1 = x1;
|
|
if (y1 < b->y1) b->y1 = y1;
|
|
if (x2 > b->x2) b->x2 = x2;
|
|
if (y2 > b->y2) b->y2 = y2;
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
PIXMAN_EXPORT void
|
|
pixman_f_transform_init_identity (struct pixman_f_transform *t)
|
|
{
|
|
int i, j;
|
|
|
|
for (j = 0; j < 3; j++)
|
|
{
|
|
for (i = 0; i < 3; i++)
|
|
t->m[j][i] = i == j ? 1 : 0;
|
|
}
|
|
}
|