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Redefine output rotations

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It was discovered in issue #99 that the implementations of the 90 and 270
degree rotations were actually the inverse of what the Wayland specification
spelled out. This patch fixes the libweston implementation to follow the
specification.

As a result, the behaviour of the the weston.ini transform key also changes. To
force all users to re-think their configuration, the transform key values are
also changed. Since Weston and libweston change their behaviour, the handling
of clients' buffer transform changes too.

All the functions had their 90/270 cases simply swapped, probably due to
confusion of whether WL_OUTPUT_TRANSFORM_* refers to rotating the monitor or
the content.

Hint: a key to understanding weston_matrix_rotate_xy(m, c, s) is that the
rotation matrix is formed as

  c -s
  s  c

that is, it's column-major. This fooled me at first.

Fixing window.c fixes weston-terminal and weston-transformed.

In simple-damage, window_get_transformed_ball() is fixed to follow the proper
transform definitions, but the fix to the viewport path in redraw() is purely
mechanical.  The viewport path looks broken to me in the presence of any
transform, but it is not this patch's job to fix it.

Screen-share fix just repeats the general code fix pattern, I did not even try
to understand that bit.

https://gitlab.freedesktop.org/wayland/weston/issues/99

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
dev
Pekka Paalanen 5 years ago committed by Daniel Stone
parent 0df4477924
commit 8060d826b7
8 changed files with 88 additions and 84 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 32
      clients/simple-damage.c
  2. 3
      clients/transformed.c
  3. 24
      clients/window.c
  4. 12
      compositor/main.c
  5. 8
      compositor/screen-share.c
  6. 64
      libweston/compositor.c
  7. 5
      man/weston-drm.man
  8. 16
      man/weston.ini.man

32
clients/simple-damage.c
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@ -461,32 +461,32 @@ window_get_transformed_ball(struct window *window, float *bx, float *by)
*by = wy;
break;
case WL_OUTPUT_TRANSFORM_90:
*bx = window->height - wy;
*by = wx;
*bx = wy;
*by = window->width - wx;
break;
case WL_OUTPUT_TRANSFORM_180:
*bx = window->width - wx;
*by = window->height - wy;
break;
case WL_OUTPUT_TRANSFORM_270:
*bx = wy;
*by = window->width - wx;
*bx = window->height - wy;
*by = wx;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED:
*bx = window->width - wx;
*by = wy;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_90:
*bx = window->height - wy;
*by = window->width - wx;
*bx = wy;
*by = wx;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_180:
*bx = wx;
*by = window->height - wy;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_270:
*bx = wy;
*by = wx;
*bx = window->height - wy;
*by = window->width - wx;
break;
}
@ -570,32 +570,32 @@ redraw(void *data, struct wl_callback *callback, uint32_t time)
off_x = tx;
break;
case WL_OUTPUT_TRANSFORM_90:
off_y = tx;
off_x = bwidth - ty;
off_y = bheight - tx;
off_x = ty;
break;
case WL_OUTPUT_TRANSFORM_180:
off_y = bheight - ty;
off_x = bwidth - tx;
break;
case WL_OUTPUT_TRANSFORM_270:
off_y = bheight - tx;
off_x = ty;
off_y = tx;
off_x = bwidth - ty;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED:
off_y = ty;
off_x = bwidth - tx;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_90:
off_y = bheight - tx;
off_x = bwidth - ty;
off_y = tx;
off_x = ty;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_180:
off_y = bheight - ty;
off_x = tx;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_270:
off_y = tx;
off_x = ty;
off_y = bheight - tx;
off_x = bwidth - ty;
break;
}
wp_viewport_set_source(window->viewport,

3
clients/transformed.c
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@ -231,6 +231,9 @@ usage(int error_code)
" -h <height>\tSet window height to <height>\n"
" --help\tShow this help text\n\n");
fprintf(stderr, "This version has been fixed for "
"https://gitlab.freedesktop.org/wayland/weston/issues/99 .\n");
exit(error_code);
}

24
clients/window.c
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@ -1832,14 +1832,14 @@ widget_cairo_update_transform(struct widget *widget, cairo_t *cr)
translate_y = 0;
break;
case WL_OUTPUT_TRANSFORM_90:
angle = M_PI_2;
translate_x = surface_height;
translate_y = 0;
angle = M_PI + M_PI_2;
translate_x = 0;
translate_y = surface_width;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_90:
angle = M_PI_2;
translate_x = surface_height;
translate_y = surface_width;
angle = M_PI + M_PI_2;
translate_x = 0;
translate_y = 0;
break;
case WL_OUTPUT_TRANSFORM_180:
angle = M_PI;
@ -1852,14 +1852,14 @@ widget_cairo_update_transform(struct widget *widget, cairo_t *cr)
translate_y = surface_height;
break;
case WL_OUTPUT_TRANSFORM_270:
angle = M_PI + M_PI_2;
translate_x = 0;
translate_y = surface_width;
angle = M_PI_2;
translate_x = surface_height;
translate_y = 0;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_270:
angle = M_PI + M_PI_2;
translate_x = 0;
translate_y = 0;
angle = M_PI_2;
translate_x = surface_height;
translate_y = surface_width;
break;
}

12
compositor/main.c
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@ -1108,13 +1108,13 @@ weston_choose_default_backend(void)
static const struct { const char *name; uint32_t token; } transforms[] = {
{ "normal", WL_OUTPUT_TRANSFORM_NORMAL },
{ "90", WL_OUTPUT_TRANSFORM_90 },
{ "180", WL_OUTPUT_TRANSFORM_180 },
{ "270", WL_OUTPUT_TRANSFORM_270 },
{ "rotate-90", WL_OUTPUT_TRANSFORM_90 },
{ "rotate-180", WL_OUTPUT_TRANSFORM_180 },
{ "rotate-270", WL_OUTPUT_TRANSFORM_270 },
{ "flipped", WL_OUTPUT_TRANSFORM_FLIPPED },
{ "flipped-90", WL_OUTPUT_TRANSFORM_FLIPPED_90 },
{ "flipped-180", WL_OUTPUT_TRANSFORM_FLIPPED_180 },
{ "flipped-270", WL_OUTPUT_TRANSFORM_FLIPPED_270 },
{ "flipped-rotate-90", WL_OUTPUT_TRANSFORM_FLIPPED_90 },
{ "flipped-rotate-180", WL_OUTPUT_TRANSFORM_FLIPPED_180 },
{ "flipped-rotate-270", WL_OUTPUT_TRANSFORM_FLIPPED_270 },
};
WL_EXPORT int

8
compositor/screen-share.c
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@ -551,8 +551,8 @@ output_compute_transform(struct weston_output *output,
break;
case WL_OUTPUT_TRANSFORM_90:
case WL_OUTPUT_TRANSFORM_FLIPPED_90:
pixman_transform_rotate(transform, NULL, 0, pixman_fixed_1);
pixman_transform_translate(transform, NULL, fh, 0);
pixman_transform_rotate(transform, NULL, 0, -pixman_fixed_1);
pixman_transform_translate(transform, NULL, 0, fw);
break;
case WL_OUTPUT_TRANSFORM_180:
case WL_OUTPUT_TRANSFORM_FLIPPED_180:
@ -561,8 +561,8 @@ output_compute_transform(struct weston_output *output,
break;
case WL_OUTPUT_TRANSFORM_270:
case WL_OUTPUT_TRANSFORM_FLIPPED_270:
pixman_transform_rotate(transform, NULL, 0, -pixman_fixed_1);
pixman_transform_translate(transform, NULL, 0, fw);
pixman_transform_rotate(transform, NULL, 0, pixman_fixed_1);
pixman_transform_translate(transform, NULL, fh, 0);
break;
}

64
libweston/compositor.c
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@ -643,12 +643,12 @@ weston_transformed_coord(int width, int height,
*by = sy;
break;
case WL_OUTPUT_TRANSFORM_90:
*bx = height - sy;
*by = sx;
*bx = sy;
*by = width - sx;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_90:
*bx = height - sy;
*by = width - sx;
*bx = sy;
*by = sx;
break;
case WL_OUTPUT_TRANSFORM_180:
*bx = width - sx;
@ -659,12 +659,12 @@ weston_transformed_coord(int width, int height,
*by = height - sy;
break;
case WL_OUTPUT_TRANSFORM_270:
*bx = sy;
*by = width - sx;
*bx = height - sy;
*by = sx;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_270:
*bx = sy;
*by = sx;
*bx = height - sy;
*by = width - sx;
break;
}
@ -830,10 +830,10 @@ weston_transformed_region(int width, int height,
dest_rects[i].y2 = src_rects[i].y2;
break;
case WL_OUTPUT_TRANSFORM_90:
dest_rects[i].x1 = height - src_rects[i].y2;
dest_rects[i].y1 = src_rects[i].x1;
dest_rects[i].x2 = height - src_rects[i].y1;
dest_rects[i].y2 = src_rects[i].x2;
dest_rects[i].x1 = src_rects[i].y1;
dest_rects[i].y1 = width - src_rects[i].x2;
dest_rects[i].x2 = src_rects[i].y2;
dest_rects[i].y2 = width - src_rects[i].x1;
break;
case WL_OUTPUT_TRANSFORM_180:
dest_rects[i].x1 = width - src_rects[i].x2;
@ -842,10 +842,10 @@ weston_transformed_region(int width, int height,
dest_rects[i].y2 = height - src_rects[i].y1;
break;
case WL_OUTPUT_TRANSFORM_270:
dest_rects[i].x1 = src_rects[i].y1;
dest_rects[i].y1 = width - src_rects[i].x2;
dest_rects[i].x2 = src_rects[i].y2;
dest_rects[i].y2 = width - src_rects[i].x1;
dest_rects[i].x1 = height - src_rects[i].y2;
dest_rects[i].y1 = src_rects[i].x1;
dest_rects[i].x2 = height - src_rects[i].y1;
dest_rects[i].y2 = src_rects[i].x2;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED:
dest_rects[i].x1 = width - src_rects[i].x2;
@ -854,10 +854,10 @@ weston_transformed_region(int width, int height,
dest_rects[i].y2 = src_rects[i].y2;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_90:
dest_rects[i].x1 = height - src_rects[i].y2;
dest_rects[i].y1 = width - src_rects[i].x2;
dest_rects[i].x2 = height - src_rects[i].y1;
dest_rects[i].y2 = width - src_rects[i].x1;
dest_rects[i].x1 = src_rects[i].y1;
dest_rects[i].y1 = src_rects[i].x1;
dest_rects[i].x2 = src_rects[i].y2;
dest_rects[i].y2 = src_rects[i].x2;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_180:
dest_rects[i].x1 = src_rects[i].x1;
@ -866,10 +866,10 @@ weston_transformed_region(int width, int height,
dest_rects[i].y2 = height - src_rects[i].y1;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_270:
dest_rects[i].x1 = src_rects[i].y1;
dest_rects[i].y1 = src_rects[i].x1;
dest_rects[i].x2 = src_rects[i].y2;
dest_rects[i].y2 = src_rects[i].x2;
dest_rects[i].x1 = height - src_rects[i].y2;
dest_rects[i].y1 = width - src_rects[i].x2;
dest_rects[i].x2 = height - src_rects[i].y1;
dest_rects[i].y2 = width - src_rects[i].x1;
break;
}
}
@ -3402,9 +3402,9 @@ weston_surface_build_buffer_matrix(const struct weston_surface *surface,
break;
case WL_OUTPUT_TRANSFORM_90:
case WL_OUTPUT_TRANSFORM_FLIPPED_90:
weston_matrix_rotate_xy(matrix, 0, 1);
weston_matrix_rotate_xy(matrix, 0, -1);
weston_matrix_translate(matrix,
surface->height_from_buffer, 0, 0);
0, surface->width_from_buffer, 0);
break;
case WL_OUTPUT_TRANSFORM_180:
case WL_OUTPUT_TRANSFORM_FLIPPED_180:
@ -3415,9 +3415,9 @@ weston_surface_build_buffer_matrix(const struct weston_surface *surface,
break;
case WL_OUTPUT_TRANSFORM_270:
case WL_OUTPUT_TRANSFORM_FLIPPED_270:
weston_matrix_rotate_xy(matrix, 0, -1);
weston_matrix_rotate_xy(matrix, 0, 1);
weston_matrix_translate(matrix,
0, surface->width_from_buffer, 0);
surface->height_from_buffer, 0, 0);
break;
}
@ -5786,8 +5786,8 @@ weston_output_update_matrix(struct weston_output *output)
break;
case WL_OUTPUT_TRANSFORM_90:
case WL_OUTPUT_TRANSFORM_FLIPPED_90:
weston_matrix_translate(&output->matrix, 0, -output->height, 0);
weston_matrix_rotate_xy(&output->matrix, 0, 1);
weston_matrix_translate(&output->matrix, -output->width, 0, 0);
weston_matrix_rotate_xy(&output->matrix, 0, -1);
break;
case WL_OUTPUT_TRANSFORM_180:
case WL_OUTPUT_TRANSFORM_FLIPPED_180:
@ -5797,8 +5797,8 @@ weston_output_update_matrix(struct weston_output *output)
break;
case WL_OUTPUT_TRANSFORM_270:
case WL_OUTPUT_TRANSFORM_FLIPPED_270:
weston_matrix_translate(&output->matrix, -output->width, 0, 0);
weston_matrix_rotate_xy(&output->matrix, 0, -1);
weston_matrix_translate(&output->matrix, 0, -output->height, 0);
weston_matrix_rotate_xy(&output->matrix, 0, 1);
break;
}

5
man/weston-drm.man
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@ -119,8 +119,9 @@ can generate detailed mode lines.
\fBtransform\fR=\fItransform\fR
Transform for the output, which can be rotated in 90-degree steps
and possibly flipped. Possible values are
.BR normal ", " 90 ", " 180 ", " 270 ", "
.BR flipped ", " flipped-90 ", " flipped-180 ", and " flipped-270 .
.BR normal ", " rotate-90 ", " rotate-180 ", " rotate-270 ", "
.BR flipped ", " flipped-rotate-90 ", " flipped-rotate-180 ", and "
.BR flipped-rotate-270 .
.TP
\fBpixman-shadow\fR=\fIboolean\fR
If using the Pixman-renderer, use shadow framebuffers. Defaults to

16
man/weston.ini.man
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@ -504,19 +504,19 @@ for examples of modes-formats supported by DRM backend.
.RE
.TP 7
.BI "transform=" normal
The transformation applied to screen output (string). The transform key can
be one of the following 8 strings:
How you have rotated your monitor from its normal orientation (string).
The transform key can be one of the following 8 strings:
.PP
.RS 10
.nf
.BR "normal " "Normal output."
.BR "90 " "90 degrees clockwise."
.BR "180 " "Upside down."
.BR "270 " "90 degrees counter clockwise."
.BR "rotate-90 " "90 degrees clockwise."
.BR "rotate-180 " "Upside down."
.BR "rotate-270 " "90 degrees counter clockwise."
.BR "flipped " "Horizontally flipped"
.BR "flipped-90 " "Flipped and 90 degrees clockwise"
.BR "flipped-180 " "Flipped upside down"
.BR "flipped-270 " "Flipped and 90 degrees counter clockwise"
.BR "flipped-rotate-90 " "Flipped and 90 degrees clockwise"
.BR "flipped-rotate-180 " "Flipped and upside down"
.BR "flipped-rotate-270 " "Flipped and 90 degrees counter clockwise"
.fi
.RE
.TP 7

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