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xserver-multidpi/randr/rrtransform.c

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/*
* Copyright © 2007 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.
*/
#include "randrstr.h"
#include "rrtransform.h"
void
RRTransformInit(RRTransformPtr transform)
{
pixman_transform_init_identity(&transform->transform);
pixman_f_transform_init_identity(&transform->f_transform);
pixman_f_transform_init_identity(&transform->f_inverse);
transform->filter = NULL;
transform->params = NULL;
transform->nparams = 0;
}
void
RRTransformFini(RRTransformPtr transform)
{
free(transform->params);
}
Bool
RRTransformEqual(RRTransformPtr a, RRTransformPtr b)
{
if (a && pixman_transform_is_identity(&a->transform))
a = NULL;
if (b && pixman_transform_is_identity(&b->transform))
b = NULL;
if (a == NULL && b == NULL)
return TRUE;
if (a == NULL || b == NULL)
return FALSE;
if (memcmp(&a->transform, &b->transform, sizeof(a->transform)) != 0)
return FALSE;
if (a->filter != b->filter)
return FALSE;
if (a->nparams != b->nparams)
return FALSE;
if (memcmp(a->params, b->params, a->nparams * sizeof(xFixed)) != 0)
return FALSE;
return TRUE;
}
Bool
RRTransformSetFilter(RRTransformPtr dst,
PictFilterPtr filter,
xFixed * params, int nparams, int width, int height)
{
xFixed *new_params;
if (nparams) {
new_params = xallocarray(nparams, sizeof(xFixed));
if (!new_params)
return FALSE;
memcpy(new_params, params, nparams * sizeof(xFixed));
}
else
new_params = NULL;
free(dst->params);
dst->filter = filter;
dst->params = new_params;
dst->nparams = nparams;
dst->width = width;
dst->height = height;
return TRUE;
}
Bool
RRTransformCopy(RRTransformPtr dst, RRTransformPtr src)
{
if (src && pixman_transform_is_identity(&src->transform))
src = NULL;
if (src) {
if (!RRTransformSetFilter(dst, src->filter,
src->params, src->nparams, src->width,
src->height))
return FALSE;
dst->transform = src->transform;
dst->f_transform = src->f_transform;
dst->f_inverse = src->f_inverse;
}
else {
if (!RRTransformSetFilter(dst, NULL, NULL, 0, 0, 0))
return FALSE;
pixman_transform_init_identity(&dst->transform);
pixman_f_transform_init_identity(&dst->f_transform);
pixman_f_transform_init_identity(&dst->f_inverse);
}
return TRUE;
}
#define F(x) IntToxFixed(x)
static void
RRTransformRescale(struct pixman_f_transform *f_transform, double limit)
{
double max = 0, v, scale;
int i, j;
for (j = 0; j < 3; j++)
for (i = 0; i < 3; i++)
if ((v = fabs(f_transform->m[j][i])) > max)
max = v;
scale = limit / max;
for (j = 0; j < 3; j++)
for (i = 0; i < 3; i++)
f_transform->m[j][i] *= scale;
}
/*
* Compute the complete transformation matrix including
* client-specified transform, rotation/reflection values and the crtc
* offset.
*
* Return TRUE if the resulting transform is not a simple translation.
*/
Bool
RRTransformCompute(int x,
int y,
int width,
int height,
Rotation rotation,
RRTransformPtr rr_transform,
PictTransformPtr transform,
struct pixman_f_transform *f_transform,
struct pixman_f_transform *f_inverse)
{
PictTransform t_transform, inverse;
struct pixman_f_transform tf_transform, tf_inverse;
Bool overflow = FALSE;
if (!transform)
transform = &t_transform;
if (!f_transform)
f_transform = &tf_transform;
if (!f_inverse)
f_inverse = &tf_inverse;
pixman_transform_init_identity(transform);
pixman_transform_init_identity(&inverse);
pixman_f_transform_init_identity(f_transform);
pixman_f_transform_init_identity(f_inverse);
if (rotation != RR_Rotate_0) {
double f_rot_cos, f_rot_sin, f_rot_dx, f_rot_dy;
double f_scale_x, f_scale_y, f_scale_dx, f_scale_dy;
xFixed rot_cos, rot_sin, rot_dx, rot_dy;
xFixed scale_x, scale_y, scale_dx, scale_dy;
/* rotation */
switch (rotation & 0xf) {
default:
case RR_Rotate_0:
f_rot_cos = 1;
f_rot_sin = 0;
f_rot_dx = 0;
f_rot_dy = 0;
rot_cos = F(1);
rot_sin = F(0);
rot_dx = F(0);
rot_dy = F(0);
break;
case RR_Rotate_90:
f_rot_cos = 0;
f_rot_sin = 1;
f_rot_dx = height;
f_rot_dy = 0;
rot_cos = F(0);
rot_sin = F(1);
rot_dx = F(height);
rot_dy = F(0);
break;
case RR_Rotate_180:
f_rot_cos = -1;
f_rot_sin = 0;
f_rot_dx = width;
f_rot_dy = height;
rot_cos = F(~0u);
rot_sin = F(0);
rot_dx = F(width);
rot_dy = F(height);
break;
case RR_Rotate_270:
f_rot_cos = 0;
f_rot_sin = -1;
f_rot_dx = 0;
f_rot_dy = width;
rot_cos = F(0);
rot_sin = F(~0u);
rot_dx = F(0);
rot_dy = F(width);
break;
}
pixman_transform_rotate(transform, &inverse, rot_cos, rot_sin);
pixman_transform_translate(transform, &inverse, rot_dx, rot_dy);
pixman_f_transform_rotate(f_transform, f_inverse, f_rot_cos, f_rot_sin);
pixman_f_transform_translate(f_transform, f_inverse, f_rot_dx,
f_rot_dy);
/* reflection */
f_scale_x = 1;
f_scale_dx = 0;
f_scale_y = 1;
f_scale_dy = 0;
scale_x = F(1);
scale_dx = 0;
scale_y = F(1);
scale_dy = 0;
if (rotation & RR_Reflect_X) {
f_scale_x = -1;
scale_x = F(~0u);
if (rotation & (RR_Rotate_0 | RR_Rotate_180)) {
f_scale_dx = width;
scale_dx = F(width);
}
else {
f_scale_dx = height;
scale_dx = F(height);
}
}
if (rotation & RR_Reflect_Y) {
f_scale_y = -1;
scale_y = F(~0u);
if (rotation & (RR_Rotate_0 | RR_Rotate_180)) {
f_scale_dy = height;
scale_dy = F(height);
}
else {
f_scale_dy = width;
scale_dy = F(width);
}
}
pixman_transform_scale(transform, &inverse, scale_x, scale_y);
pixman_f_transform_scale(f_transform, f_inverse, f_scale_x, f_scale_y);
pixman_transform_translate(transform, &inverse, scale_dx, scale_dy);
pixman_f_transform_translate(f_transform, f_inverse, f_scale_dx,
f_scale_dy);
}
#ifdef RANDR_12_INTERFACE
if (rr_transform) {
if (!pixman_transform_multiply
(transform, &rr_transform->transform, transform))
overflow = TRUE;
pixman_f_transform_multiply(f_transform, &rr_transform->f_transform,
f_transform);
pixman_f_transform_multiply(f_inverse, f_inverse,
&rr_transform->f_inverse);
}
#endif
/*
* Compute the class of the resulting transform
*/
if (!overflow && pixman_transform_is_identity(transform)) {
pixman_transform_init_translate(transform, F(x), F(y));
pixman_f_transform_init_translate(f_transform, x, y);
pixman_f_transform_init_translate(f_inverse, -x, -y);
return FALSE;
}
else {
pixman_f_transform_translate(f_transform, f_inverse, x, y);
if (!pixman_transform_translate(transform, &inverse, F(x), F(y)))
overflow = TRUE;
if (overflow) {
struct pixman_f_transform f_scaled;
f_scaled = *f_transform;
RRTransformRescale(&f_scaled, 16384.0);
pixman_transform_from_pixman_f_transform(transform, &f_scaled);
}
return TRUE;
}
}
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