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rendernode: Implement diffing of transform nodes

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This reinstates diffing in the same way that it worked for offset nodes.

It would be possible to add diffing for affine transforms or even all
transforms, but I think this is unnecessary right now - and also quite
expensive to compute.
This commit is contained in:
Benjamin Otte 2019-03-04 22:11:57 +01:00
parent a8bf5eee0f
commit dbe58452d7
1 changed files with 63 additions and 1 deletions
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64
gsk/gskrendernodeimpl.c
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@ -2427,6 +2427,68 @@ gsk_transform_node_draw (GskRenderNode *node,
gsk_render_node_draw (self->child, cr);
}
static void
gsk_transform_node_diff (GskRenderNode *node1,
GskRenderNode *node2,
cairo_region_t *region)
{
GskTransformNode *self1 = (GskTransformNode *) node1;
GskTransformNode *self2 = (GskTransformNode *) node2;
if (!gsk_transform_equal (self1->transform, self2->transform))
{
gsk_render_node_diff_impossible (node1, node2, region);
return;
}
if (self1->child == self2->child)
return;
switch (gsk_transform_get_category (self1->transform))
{
case GSK_TRANSFORM_CATEGORY_IDENTITY:
gsk_render_node_diff (self1->child, self2->child, region);
break;
case GSK_TRANSFORM_CATEGORY_2D_TRANSLATE:
{
cairo_region_t *sub;
float dx, dy;
gsk_transform_to_translate (self1->transform, &dx, &dy);
sub = cairo_region_create ();
gsk_render_node_diff (self1->child, self2->child, sub);
cairo_region_translate (sub, floor (dx), floor (dy));
if (floor (dx) != dx)
{
cairo_region_t *tmp = cairo_region_copy (sub);
cairo_region_translate (tmp, 1, 0);
cairo_region_union (sub, tmp);
cairo_region_destroy (sub);
}
if (floor (dy) != dy)
{
cairo_region_t *tmp = cairo_region_copy (sub);
cairo_region_translate (tmp, 0, 1);
cairo_region_union (sub, tmp);
cairo_region_destroy (sub);
}
cairo_region_union (region, sub);
cairo_region_destroy (sub);
}
break;
case GSK_TRANSFORM_CATEGORY_UNKNOWN:
case GSK_TRANSFORM_CATEGORY_ANY:
case GSK_TRANSFORM_CATEGORY_3D:
case GSK_TRANSFORM_CATEGORY_2D:
case GSK_TRANSFORM_CATEGORY_2D_AFFINE:
default:
gsk_render_node_diff_impossible (node1, node2, region);
break;
}
}
#define GSK_TRANSFORM_NODE_VARIANT_TYPE "(idddddddddddddddduv)"
static GVariant *
@ -2502,7 +2564,7 @@ static const GskRenderNodeClass GSK_TRANSFORM_NODE_CLASS = {
gsk_transform_node_finalize,
gsk_transform_node_draw,
gsk_render_node_can_diff_true,
gsk_render_node_diff_impossible,
gsk_transform_node_diff,
gsk_transform_node_serialize,
gsk_transform_node_deserialize
};