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Fix #5643: in sway's render.c, use floor for rounding

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Currently, various floating-point expressions involving
the coordinates of borders, titlebars and content surfaces
are directly assigned to integer values before being passed
to lower-level functions, and so are rounded towards
zero.

Some of these floating-point expressions can have fractional
negative values, so the coordinates of the top-left corners
of titlebars, borders and surfaces are rounded towards
bottom-right, while the coordinates of the bottom-right corners
are rounded towards top-left.

These glitches can be best observed with semi-transparent
titlebars and borders.

Fixed by passing several of these expressions to the floor
function before assignment.
This commit is contained in:
Dimitris Triantafyllidis 2020-09-06 18:59:23 +03:00
parent 7ca9ef12f8
commit 9eedc09ac8
1 changed files with 22 additions and 22 deletions
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44
sway/desktop/render.c
View file

@ -261,7 +261,7 @@ static void render_view_toplevels(struct sway_view *view,
output->lx - view->geometry.x;
double oy = view->container->surface_y -
output->ly - view->geometry.y;
output_surface_for_each_surface(output, view->surface, ox, oy,
output_surface_for_each_surface(output, view->surface, floor(ox), floor(oy),
render_surface_iterator, &data);
}
@ -299,10 +299,10 @@ static void render_saved_view(struct sway_view *view,
}
struct wlr_box box = {
.x = view->container->surface_x - output->lx -
view->saved_geometry.x + saved_buf->x,
.y = view->container->surface_y - output->ly -
view->saved_geometry.y + saved_buf->y,
.x = floor(view->container->surface_x - output->lx -
view->saved_geometry.x + saved_buf->x),
.y = floor(view->container->surface_y - output->ly -
view->saved_geometry.y + saved_buf->y),
.width = saved_buf->width,
.height = saved_buf->height,
};
@ -358,8 +358,8 @@ static void render_view(struct sway_output *output, pixman_region32_t *damage,
if (state->border_left) {
memcpy(&color, colors->child_border, sizeof(float) * 4);
premultiply_alpha(color, con->alpha);
box.x = state->x;
box.y = state->content_y;
box.x = floor(state->x);
box.y = floor(state->content_y);
box.width = state->border_thickness;
box.height = state->content_height;
scale_box(&box, output_scale);
@ -377,8 +377,8 @@ static void render_view(struct sway_output *output, pixman_region32_t *damage,
memcpy(&color, colors->child_border, sizeof(float) * 4);
}
premultiply_alpha(color, con->alpha);
box.x = state->content_x + state->content_width;
box.y = state->content_y;
box.x = floor(state->content_x + state->content_width);
box.y = floor(state->content_y);
box.width = state->border_thickness;
box.height = state->content_height;
scale_box(&box, output_scale);
@ -392,8 +392,8 @@ static void render_view(struct sway_output *output, pixman_region32_t *damage,
memcpy(&color, colors->child_border, sizeof(float) * 4);
}
premultiply_alpha(color, con->alpha);
box.x = state->x;
box.y = state->content_y + state->content_height;
box.x = floor(state->x);
box.y = floor(state->content_y + state->content_height);
box.width = state->width;
box.height = state->border_thickness;
scale_box(&box, output_scale);
@ -670,8 +670,8 @@ static void render_top_border(struct sway_output *output,
// Child border - top edge
memcpy(&color, colors->child_border, sizeof(float) * 4);
premultiply_alpha(color, con->alpha);
box.x = state->x;
box.y = state->y;
box.x = floor(state->x);
box.y = floor(state->y);
box.width = state->width;
box.height = state->border_thickness;
scale_box(&box, output_scale);
@ -726,8 +726,8 @@ static void render_containers_linear(struct sway_output *output,
}
if (state->border == B_NORMAL) {
render_titlebar(output, damage, child, state->x,
state->y, state->width, colors,
render_titlebar(output, damage, child, floor(state->x),
floor(state->y), state->width, colors,
title_texture, marks_texture);
} else if (state->border == B_PIXEL) {
render_top_border(output, damage, child, colors);
@ -781,7 +781,7 @@ static void render_containers_tabbed(struct sway_output *output,
marks_texture = child->marks_unfocused;
}
int x = cstate->x + tab_width * i;
int x = floor(cstate->x + tab_width * i);
// Make last tab use the remaining width of the parent
if (i == parent->children->length - 1) {
@ -894,8 +894,8 @@ static void render_container(struct sway_output *output,
struct parent_data data = {
.layout = con->current.layout,
.box = {
.x = con->current.x,
.y = con->current.y,
.x = floor(con->current.x),
.y = floor(con->current.y),
.width = con->current.width,
.height = con->current.height,
},
@ -911,8 +911,8 @@ static void render_workspace(struct sway_output *output,
struct parent_data data = {
.layout = ws->current.layout,
.box = {
.x = ws->current.x,
.y = ws->current.y,
.x = floor(ws->current.x),
.y = floor(ws->current.y),
.width = ws->current.width,
.height = ws->current.height,
},
@ -946,8 +946,8 @@ static void render_floating_container(struct sway_output *soutput,
}
if (con->current.border == B_NORMAL) {
render_titlebar(soutput, damage, con, con->current.x,
con->current.y, con->current.width, colors,
render_titlebar(soutput, damage, con, floor(con->current.x),
floor(con->current.y), con->current.width, colors,
title_texture, marks_texture);
} else if (con->current.border == B_PIXEL) {
render_top_border(soutput, damage, con, colors);