mirror of
https://gitlab.freedesktop.org/wayland/weston
synced 2024-10-03 02:23:16 +00:00
libweston: Add function to find the output transform of a matrix
When we build up a matrix from a series of operations, it's very useful to know if the combined operations still result in something that matches a wl_output_transform. This adds a function to test if a matrix leads to a standard output transform, and returns the transform if it does. Tests are provided that check if complex series of operations return expected results - the weston_matrix_needs_filtering function is tested at the same time. Signed-off-by: Derek Foreman <derek.foreman@collabora.com>
This commit is contained in:
Derek Foreman
parent
0e2136df7b
commit
92a9860e1d
|
|
@ -29,6 +29,8 @@
|
|||
|
||||
#include <stdbool.h>
|
||||
|
||||
#include <wayland-server-protocol.h>
|
||||
|
||||
#ifdef __cplusplus
|
||||
extern "C" {
|
||||
#endif
|
||||
|
|
@ -71,6 +73,10 @@ weston_matrix_invert(struct weston_matrix *inverse,
|
|||
bool
|
||||
weston_matrix_needs_filtering(const struct weston_matrix *matrix);
|
||||
|
||||
bool
|
||||
weston_matrix_to_transform(const struct weston_matrix *mat,
|
||||
enum wl_output_transform *transform);
|
||||
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
#endif
|
||||
|
|
|
|||
121
shared/matrix.c
121
shared/matrix.c
|
|
@ -296,6 +296,12 @@ near_zero_at(const struct weston_matrix *matrix, int row, int col)
|
|||
return near_zero(get_el(matrix, row, col));
|
||||
}
|
||||
|
||||
static bool
|
||||
near_one_at(const struct weston_matrix *matrix, int row, int col)
|
||||
{
|
||||
return near_zero(get_el(matrix, row, col) - 1.0);
|
||||
}
|
||||
|
||||
static bool
|
||||
near_pm_one_at(const struct weston_matrix *matrix, int row, int col)
|
||||
{
|
||||
|
|
@ -395,3 +401,118 @@ weston_matrix_needs_filtering(const struct weston_matrix *matrix)
|
|||
* heuristics, so recommend filtering */
|
||||
return true;
|
||||
}
|
||||
|
||||
/** Examine a matrix to see if it applies a standard output transform.
|
||||
*
|
||||
* \param mat matrix to examine
|
||||
* \param[out] transform the transform, if applicable
|
||||
* \return true if a standard transform is present
|
||||
|
||||
* Note that the check only considers rotations and flips.
|
||||
* If any other scale or translation is present, those may have to
|
||||
* be dealt with by the caller in some way.
|
||||
*/
|
||||
WL_EXPORT bool
|
||||
weston_matrix_to_transform(const struct weston_matrix *mat,
|
||||
enum wl_output_transform *transform)
|
||||
{
|
||||
/* As a first pass we can eliminate any matrix that doesn't have
|
||||
* zeroes in these positions:
|
||||
* [ ? ? 0 ? ]
|
||||
* [ ? ? 0 ? ]
|
||||
* [ 0 0 ? ? ]
|
||||
* [ 0 0 0 ? ]
|
||||
* As they will be non-affine, or rotations about axes
|
||||
* other than Z.
|
||||
*/
|
||||
if (!near_zero_at(mat, 2, 0) ||
|
||||
!near_zero_at(mat, 3, 0) ||
|
||||
!near_zero_at(mat, 2, 1) ||
|
||||
!near_zero_at(mat, 3, 1) ||
|
||||
!near_zero_at(mat, 0, 2) ||
|
||||
!near_zero_at(mat, 1, 2) ||
|
||||
!near_zero_at(mat, 3, 2))
|
||||
return false;
|
||||
|
||||
/* Enforce the form:
|
||||
* [ ? ? 0 ? ]
|
||||
* [ ? ? 0 ? ]
|
||||
* [ 0 0 ? ? ]
|
||||
* [ 0 0 0 1 ]
|
||||
* While we could scale all the elements by a constant to make
|
||||
* 3,3 == 1, we choose to be lazy and not bother. A matrix
|
||||
* that doesn't fit this form seems likely to be too complicated
|
||||
* to pass the other checks.
|
||||
*/
|
||||
if (!near_one_at(mat, 3, 3))
|
||||
return false;
|
||||
|
||||
if (near_zero_at(mat, 0, 0)) {
|
||||
if (!near_zero_at(mat, 1, 1))
|
||||
return false;
|
||||
|
||||
/* We now have a matrix like:
|
||||
* [ 0 A 0 ? ]
|
||||
* [ B 0 0 ? ]
|
||||
* [ 0 0 ? ? ]
|
||||
* [ 0 0 0 1 ]
|
||||
* When transforming a vector with a matrix of this form, the X
|
||||
* and Y coordinates are effectively exchanged, so we have a
|
||||
* 90 or 270 degree rotation (not 0 or 180), and could have
|
||||
* a flip depending on the signs of A and B.
|
||||
*
|
||||
* We don't require A and B to have the same absolute value,
|
||||
* so there may be independent scales in the X or Y dimensions.
|
||||
*/
|
||||
if (get_el(mat, 0, 1) > 0) {
|
||||
/* A is positive */
|
||||
|
||||
if (get_el(mat, 1, 0) > 0)
|
||||
*transform = WL_OUTPUT_TRANSFORM_FLIPPED_90;
|
||||
else
|
||||
*transform = WL_OUTPUT_TRANSFORM_90;
|
||||
} else {
|
||||
/* A is negative */
|
||||
|
||||
if (get_el(mat, 1, 0) > 0)
|
||||
*transform = WL_OUTPUT_TRANSFORM_270;
|
||||
else
|
||||
*transform = WL_OUTPUT_TRANSFORM_FLIPPED_270;
|
||||
}
|
||||
} else if (near_zero_at(mat, 1, 0)) {
|
||||
if (!near_zero_at(mat, 0, 1))
|
||||
return false;
|
||||
|
||||
/* We now have a matrix like:
|
||||
* [ A 0 0 ? ]
|
||||
* [ 0 B 0 ? ]
|
||||
* [ 0 0 ? ? ]
|
||||
* [ 0 0 0 1 ]
|
||||
* This case won't exchange the X and Y inputs, so the
|
||||
* transform is 0 or 180 degrees. We could have a flip
|
||||
* depending on the signs of A and B.
|
||||
*
|
||||
* We don't require A and B to have the same absolute value,
|
||||
* so there may be independent scales in the X or Y dimensions.
|
||||
*/
|
||||
if (get_el(mat, 0, 0) > 0) {
|
||||
/* A is positive */
|
||||
|
||||
if (get_el(mat, 1, 1) > 0)
|
||||
*transform = WL_OUTPUT_TRANSFORM_NORMAL;
|
||||
else
|
||||
*transform = WL_OUTPUT_TRANSFORM_FLIPPED_180;
|
||||
} else {
|
||||
/* A is negative */
|
||||
|
||||
if (get_el(mat, 1, 1) > 0)
|
||||
*transform = WL_OUTPUT_TRANSFORM_FLIPPED;
|
||||
else
|
||||
*transform = WL_OUTPUT_TRANSFORM_180;
|
||||
}
|
||||
} else {
|
||||
return false;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
|
|
|||
286
tests/matrix-transform-test.c
Normal file
286
tests/matrix-transform-test.c
Normal file
|
|
@ -0,0 +1,286 @@
|
|||
/*
|
||||
* Copyright © 2022 Collabora, Ltd.
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining
|
||||
* a copy of this software and associated documentation files (the
|
||||
* "Software"), to deal in the Software without restriction, including
|
||||
* without limitation the rights to use, copy, modify, merge, publish,
|
||||
* distribute, sublicense, and/or sell copies of the Software, and to
|
||||
* permit persons to whom the Software is furnished to do so, subject to
|
||||
* the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice (including the
|
||||
* next paragraph) shall be included in all copies or substantial
|
||||
* portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||||
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||||
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||||
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
||||
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
||||
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
||||
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE.
|
||||
*/
|
||||
|
||||
#include "config.h"
|
||||
|
||||
#include <assert.h>
|
||||
#include <math.h>
|
||||
#include <stdbool.h>
|
||||
#include <stdint.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
|
||||
#include <wayland-client.h>
|
||||
#include "libweston-internal.h"
|
||||
#include "libweston/matrix.h"
|
||||
|
||||
#include "weston-test-client-helper.h"
|
||||
|
||||
static void
|
||||
transform_expect(struct weston_matrix *a, bool valid, enum wl_output_transform ewt)
|
||||
{
|
||||
enum wl_output_transform wt;
|
||||
|
||||
assert(weston_matrix_to_transform(a, &wt) == valid);
|
||||
if (valid)
|
||||
assert(wt == ewt);
|
||||
}
|
||||
|
||||
TEST(transformation_matrix)
|
||||
{
|
||||
struct weston_matrix a, b;
|
||||
int i;
|
||||
|
||||
weston_matrix_init(&a);
|
||||
weston_matrix_init(&b);
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
assert(a.type == 0);
|
||||
|
||||
/* Make b a matrix that rotates a surface on the x,y plane by 90
|
||||
* degrees counter-clockwise */
|
||||
weston_matrix_rotate_xy(&b, 0, -1);
|
||||
assert(b.type == WESTON_MATRIX_TRANSFORM_ROTATE);
|
||||
for (i = 0; i < 10; i++) {
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_90);
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
assert(a.type == WESTON_MATRIX_TRANSFORM_ROTATE);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_180);
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
assert(a.type == WESTON_MATRIX_TRANSFORM_ROTATE);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_270);
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
assert(a.type == WESTON_MATRIX_TRANSFORM_ROTATE);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_NORMAL);
|
||||
}
|
||||
|
||||
weston_matrix_init(&b);
|
||||
/* Make b a matrix that rotates a surface on the x,y plane by 45
|
||||
* degrees counter-clockwise. This should alternate between a
|
||||
* standard transform and a rotation that fails to match any
|
||||
* known rotations. */
|
||||
weston_matrix_rotate_xy(&b, cos(-M_PI / 4.0), sin(-M_PI / 4.0));
|
||||
assert(b.type == WESTON_MATRIX_TRANSFORM_ROTATE);
|
||||
for (i = 0; i < 10; i++) {
|
||||
weston_matrix_multiply(&a, &b);
|
||||
assert(a.type == WESTON_MATRIX_TRANSFORM_ROTATE);
|
||||
transform_expect(&a, false, 0);
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
assert(a.type == WESTON_MATRIX_TRANSFORM_ROTATE);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_90);
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
assert(a.type == WESTON_MATRIX_TRANSFORM_ROTATE);
|
||||
transform_expect(&a, false, 0);
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
assert(a.type == WESTON_MATRIX_TRANSFORM_ROTATE);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_180);
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
assert(a.type == WESTON_MATRIX_TRANSFORM_ROTATE);
|
||||
transform_expect(&a, false, 0);
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
assert(a.type == WESTON_MATRIX_TRANSFORM_ROTATE);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_270);
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
assert(a.type == WESTON_MATRIX_TRANSFORM_ROTATE);
|
||||
transform_expect(&a, false, 0);
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
assert(a.type == WESTON_MATRIX_TRANSFORM_ROTATE);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_NORMAL);
|
||||
}
|
||||
|
||||
weston_matrix_init(&b);
|
||||
/* Make b a matrix that rotates a surface on the x,y plane by 45
|
||||
* degrees counter-clockwise. This should alternate between a
|
||||
* standard transform and a rotation that fails to match any known
|
||||
* rotations. */
|
||||
weston_matrix_rotate_xy(&b, cos(-M_PI / 4.0), sin(-M_PI / 4.0));
|
||||
/* Flip a */
|
||||
weston_matrix_scale(&a, -1.0, 1.0, 1.0);
|
||||
for (i = 0; i < 10; i++) {
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, false, 0);
|
||||
/* Since we're not translated or scaled, any matrix that
|
||||
* matches a standard wl_output_transform should not need
|
||||
* filtering when used to transform images - but any
|
||||
* matrix that fails to match will. */
|
||||
assert(weston_matrix_needs_filtering(&a));
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_FLIPPED_90);
|
||||
assert(!weston_matrix_needs_filtering(&a));
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, false, 0);
|
||||
assert(weston_matrix_needs_filtering(&a));
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_FLIPPED_180);
|
||||
assert(!weston_matrix_needs_filtering(&a));
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, false, 0);
|
||||
assert(weston_matrix_needs_filtering(&a));
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_FLIPPED_270);
|
||||
assert(!weston_matrix_needs_filtering(&a));
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, false, 0);
|
||||
assert(weston_matrix_needs_filtering(&a));
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_FLIPPED);
|
||||
assert(!weston_matrix_needs_filtering(&a));
|
||||
}
|
||||
|
||||
weston_matrix_init(&a);
|
||||
/* Flip a around Y*/
|
||||
weston_matrix_scale(&a, 1.0, -1.0, 1.0);
|
||||
for (i = 0; i < 100; i++) {
|
||||
/* Throw some arbitrary translation in here to make sure it
|
||||
* doesn't have any impact. */
|
||||
weston_matrix_translate(&a, 31.0, -25.0, 0.0);
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, false, 0);
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_FLIPPED_270);
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, false, 0);
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_FLIPPED);
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, false, 0);
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_FLIPPED_90);
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, false, 0);
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_FLIPPED_180);
|
||||
}
|
||||
|
||||
/* Scale shouldn't matter, as long as it's positive */
|
||||
weston_matrix_scale(&a, 4.0, 3.0, 1.0);
|
||||
/* Invert b so it rotates the opposite direction, go back the other way. */
|
||||
weston_matrix_invert(&b, &b);
|
||||
for (i = 0; i < 100; i++) {
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, false, 0);
|
||||
assert(weston_matrix_needs_filtering(&a));
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_FLIPPED_90);
|
||||
assert(weston_matrix_needs_filtering(&a));
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, false, 0);
|
||||
assert(weston_matrix_needs_filtering(&a));
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_FLIPPED);
|
||||
assert(weston_matrix_needs_filtering(&a));
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, false, 0);
|
||||
assert(weston_matrix_needs_filtering(&a));
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_FLIPPED_270);
|
||||
assert(weston_matrix_needs_filtering(&a));
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, false, 0);
|
||||
assert(weston_matrix_needs_filtering(&a));
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_FLIPPED_180);
|
||||
assert(weston_matrix_needs_filtering(&a));
|
||||
}
|
||||
|
||||
/* Flipping Y should return us from here to normal */
|
||||
weston_matrix_scale(&a, 1.0, -1.0, 1.0);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_NORMAL);
|
||||
|
||||
weston_matrix_init(&a);
|
||||
weston_matrix_init(&b);
|
||||
weston_matrix_translate(&b, 0.5, -0.75, 0);
|
||||
/* Crawl along with translations, 0.5 and .75 will both hit an integer multiple
|
||||
* at the same time every 4th step, so assert that only the 4th steps don't need
|
||||
* filtering */
|
||||
for (i = 0; i < 100; i++) {
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_NORMAL);
|
||||
assert(weston_matrix_needs_filtering(&a));
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_NORMAL);
|
||||
assert(weston_matrix_needs_filtering(&a));
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_NORMAL);
|
||||
assert(weston_matrix_needs_filtering(&a));
|
||||
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_NORMAL);
|
||||
assert(!weston_matrix_needs_filtering(&a));
|
||||
}
|
||||
|
||||
weston_matrix_init(&b);
|
||||
weston_matrix_scale(&b, 1.5, 2.0, 1.0);
|
||||
for (i = 0; i < 10; i++) {
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_NORMAL);
|
||||
assert(weston_matrix_needs_filtering(&a));
|
||||
}
|
||||
weston_matrix_invert(&b, &b);
|
||||
for (i = 0; i < 9; i++) {
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_NORMAL);
|
||||
assert(weston_matrix_needs_filtering(&a));
|
||||
}
|
||||
/* Last step should bring us back to a matrix that doesn't need
|
||||
* a filter */
|
||||
weston_matrix_multiply(&a, &b);
|
||||
transform_expect(&a, true, WL_OUTPUT_TRANSFORM_NORMAL);
|
||||
assert(!weston_matrix_needs_filtering(&a));
|
||||
}
|
||||
|
|
@ -176,6 +176,10 @@ tests = [
|
|||
'name': 'matrix',
|
||||
'dep_objs': [ dep_libm ]
|
||||
},
|
||||
{
|
||||
'name': 'matrix-transform',
|
||||
'dep_objs': dep_libm,
|
||||
},
|
||||
{ 'name': 'output-damage', },
|
||||
{ 'name': 'output-transforms', },
|
||||
{ 'name': 'plugin-registry', },
|
||||
|
|
|
|||
Loading…
Reference in a new issue