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compositor: Add surface-to-buffer and buffer-to-surface matrices

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Add matrix representations of these two transformations. Future patches
will leverage these to simplify the coordinate transformation code.

[Pekka: commit message]
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-By: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Jason Ekstrand 2014-10-16 10:55:19 -05:00 • committed by Pekka Paalanen
parent 0f67941c2f
commit 1e05904cd3
2 changed files with 90 additions and 0 deletions
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84
src/compositor.c
View file

@ -642,6 +642,9 @@ weston_surface_create(struct weston_compositor *compositor)
wl_list_init(&surface->subsurface_list);
wl_list_init(&surface->subsurface_list_pending);
weston_matrix_init(&surface->buffer_to_surface_matrix);
weston_matrix_init(&surface->surface_to_buffer_matrix);
return surface;
}
@ -2559,6 +2562,82 @@ weston_surface_commit_subsurface_order(struct weston_surface *surface)
}
}
static void
weston_surface_build_buffer_matrix(struct weston_surface *surface,
struct weston_matrix *matrix)
{
struct weston_buffer_viewport *vp = &surface->buffer_viewport;
double src_width, src_height, dest_width, dest_height;
weston_matrix_init(matrix);
if (vp->buffer.src_width == wl_fixed_from_int(-1)) {
src_width = surface->width_from_buffer;
src_height = surface->height_from_buffer;
} else {
src_width = wl_fixed_to_double(vp->buffer.src_width);
src_height = wl_fixed_to_double(vp->buffer.src_height);
}
if (vp->surface.width == -1) {
dest_width = src_width;
dest_height = src_height;
} else {
dest_width = vp->surface.width;
dest_height = vp->surface.height;
}
if (src_width != dest_width || src_height != dest_height)
weston_matrix_scale(matrix,
src_width / dest_width,
src_height / dest_height, 1);
if (vp->buffer.src_width != wl_fixed_from_int(-1))
weston_matrix_translate(matrix,
wl_fixed_to_double(vp->buffer.src_x),
wl_fixed_to_double(vp->buffer.src_y),
0);
switch (vp->buffer.transform) {
case WL_OUTPUT_TRANSFORM_FLIPPED:
case WL_OUTPUT_TRANSFORM_FLIPPED_90:
case WL_OUTPUT_TRANSFORM_FLIPPED_180:
case WL_OUTPUT_TRANSFORM_FLIPPED_270:
weston_matrix_scale(matrix, -1, 1, 1);
weston_matrix_translate(matrix,
surface->width_from_buffer, 0, 0);
break;
}
switch (vp->buffer.transform) {
default:
case WL_OUTPUT_TRANSFORM_NORMAL:
case WL_OUTPUT_TRANSFORM_FLIPPED:
break;
case WL_OUTPUT_TRANSFORM_90:
case WL_OUTPUT_TRANSFORM_FLIPPED_90:
weston_matrix_rotate_xy(matrix, 0, 1);
weston_matrix_translate(matrix,
surface->height_from_buffer, 0, 0);
break;
case WL_OUTPUT_TRANSFORM_180:
case WL_OUTPUT_TRANSFORM_FLIPPED_180:
weston_matrix_rotate_xy(matrix, -1, 0);
weston_matrix_translate(matrix,
surface->width_from_buffer,
surface->height_from_buffer, 0);
break;
case WL_OUTPUT_TRANSFORM_270:
case WL_OUTPUT_TRANSFORM_FLIPPED_270:
weston_matrix_rotate_xy(matrix, 0, -1);
weston_matrix_translate(matrix,
0, surface->width_from_buffer, 0);
break;
}
weston_matrix_scale(matrix, vp->buffer.scale, vp->buffer.scale, 1);
}
static void
weston_surface_commit_state(struct weston_surface *surface,
struct weston_surface_state *state)
@ -2576,6 +2655,11 @@ weston_surface_commit_state(struct weston_surface *surface,
weston_surface_attach(surface, state->buffer);
weston_surface_state_set_buffer(state, NULL);
weston_surface_build_buffer_matrix(surface,
&surface->surface_to_buffer_matrix);
weston_matrix_invert(&surface->buffer_to_surface_matrix,
&surface->surface_to_buffer_matrix);
if (state->newly_attached || state->buffer_viewport.changed) {
weston_surface_update_size(surface);
if (surface->configure)

6
src/compositor.h
View file

@ -926,6 +926,12 @@ struct weston_surface {
/* All the pending state, that wl_surface.commit will apply. */
struct weston_surface_state pending;
/* Matrices representating of the full transformation between
* buffer and surface coordinates. These matrices are updated
* using the weston_surface_build_buffer_matrix function. */
struct weston_matrix buffer_to_surface_matrix;
struct weston_matrix surface_to_buffer_matrix;
/*
* If non-NULL, this function will be called on
* wl_surface::commit after a new buffer has been set up for