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rendernode: Fix various places where clip was double applied

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This is mostly untested and a result of reading the code.

The main effect here happens when a node was drawn that didn't start on
an integer boundary, which is very rare.
However, with specially crafted tests and when using fractional scaling,
this can happen.

This happened most often when clipping by the node bounds to restrict a
push_group() call. Enlarge that rectangle to fall on a pixel boundary.
This commit is contained in:
Benjamin Otte 2023-12-30 05:52:40 +01:00
parent a19bc6620a
commit 09882701c2
1 changed files with 49 additions and 6 deletions
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55
gsk/gskrendernodeimpl.c
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@ -60,6 +60,49 @@ gsk_cairo_rectangle (cairo_t *cr,
rect->size.width, rect->size.height);
}
/* apply a rectangle that bounds @rect in
* pixel-aligned device coordinates.
*
* This is useful for clipping to minimize the rectangle
* in push_group() or when blurring.
*/
static void
gsk_cairo_rectangle_pixel_aligned (cairo_t *cr,
const graphene_rect_t *rect)
{
double x0, x1, x2, x3;
double y0, y1, y2, y3;
double xmin, xmax, ymin, ymax;
x0 = rect->origin.x;
y0 = rect->origin.y;
cairo_user_to_device (cr, &x0, &y0);
x1 = rect->origin.x + rect->size.width;
y1 = rect->origin.y;
cairo_user_to_device (cr, &x1, &y1);
x2 = rect->origin.x;
y2 = rect->origin.y + rect->size.height;
cairo_user_to_device (cr, &x2, &y2);
x3 = rect->origin.x + rect->size.width;
y3 = rect->origin.y + rect->size.height;
cairo_user_to_device (cr, &x3, &y3);
xmin = MIN (MIN (x0, x1), MIN (x2, x3));
ymin = MIN (MIN (y0, y1), MIN (y2, y3));
xmax = MAX (MAX (x0, x1), MAX (x2, x3));
ymax = MAX (MAX (y0, y1), MAX (y2, y3));
xmin = floor (xmin);
ymin = floor (ymin);
xmax = ceil (xmax);
ymax = ceil (ymax);
cairo_save (cr);
cairo_identity_matrix (cr);
cairo_rectangle (cr, xmin, ymin, xmax - xmin, ymax - ymin);
cairo_restore (cr);
}
static void
rectangle_init_from_graphene (cairo_rectangle_int_t *cairo,
const graphene_rect_t *graphene)
@ -1859,8 +1902,7 @@ gsk_texture_scale_node_draw (GskRenderNode *node,
cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_PAD);
cairo_surface_destroy (surface2);
gsk_cairo_rectangle (cr, &node->bounds);
cairo_fill (cr);
cairo_paint (cr);
cairo_restore (cr);
}
@ -3587,7 +3629,7 @@ gsk_opacity_node_draw (GskRenderNode *node,
GskOpacityNode *self = (GskOpacityNode *) node;
/* clip so the push_group() creates a smaller surface */
gsk_cairo_rectangle (cr, &node->bounds);
gsk_cairo_rectangle_pixel_aligned (cr, &node->bounds);
cairo_clip (cr);
if (has_empty_clip (cr))
@ -4008,7 +4050,7 @@ gsk_repeat_node_draw (GskRenderNode *node,
graphene_rect_t clip_bounds;
float tile_left, tile_right, tile_top, tile_bottom;
gsk_cairo_rectangle (cr, &node->bounds);
gsk_cairo_rectangle_pixel_aligned (cr, &node->bounds);
cairo_clip (cr);
_graphene_rect_init_from_clip_extents (&clip_bounds, cr);
@ -4736,7 +4778,7 @@ gsk_stroke_node_draw (GskRenderNode *node,
}
else
{
gsk_cairo_rectangle (cr, &self->child->bounds);
gsk_cairo_rectangle_pixel_aligned (cr, &self->child->bounds);
cairo_clip (cr);
if (has_empty_clip (cr))
return;
@ -4934,7 +4976,7 @@ gsk_shadow_node_draw (GskRenderNode *node,
gsize i;
/* clip so the blur area stays small */
gsk_cairo_rectangle (cr, &node->bounds);
gsk_cairo_rectangle_pixel_aligned (cr, &node->bounds);
cairo_clip (cr);
if (has_empty_clip (cr))
return;
@ -4956,6 +4998,7 @@ gsk_shadow_node_draw (GskRenderNode *node,
cairo_push_group (cr);
gsk_render_node_draw (self->child, cr);
pattern = cairo_pop_group (cr);
cairo_reset_clip (cr);
gdk_cairo_set_source_rgba (cr, &shadow->color);
cairo_mask (cr, pattern);
cairo_restore (cr);