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snapshot: Factor out color matrix merging

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We will use that elsewhere in the next commit.
This commit is contained in:
Timm Bäder 2019-11-29 09:13:27 +01:00
parent fb5dc73841
commit bc7b37d307
1 changed files with 43 additions and 30 deletions
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73
gtk/gtksnapshot.c
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@ -428,13 +428,48 @@ gtk_snapshot_push_blur (GtkSnapshot *snapshot,
state->data.blur.radius = radius;
}
static GskRenderNode *
merge_color_matrix_nodes (const graphene_matrix_t *matrix2,
const graphene_vec4_t *offset2,
GskRenderNode *child)
{
GskRenderNode *grandchild = gsk_render_node_ref (gsk_color_matrix_node_get_child (child));
const graphene_matrix_t *mat1 = gsk_color_matrix_node_peek_color_matrix (child);
const graphene_vec4_t *offset1 = gsk_color_matrix_node_peek_color_offset (child);
graphene_matrix_t mat2 = *matrix2;
graphene_vec4_t off2 = *offset2;
GskRenderNode *result;
g_assert (gsk_render_node_get_node_type (child) == GSK_COLOR_MATRIX_NODE);
/* color matrix node: color = mat * p + offset; for a pixel p.
* color = mat1 * (mat2 * p + offset2) + offset1;
* = mat1 * mat2 * p + offset2 * mat1 + offset1
* = (mat1 * mat2) * p + (offset2 * mat1 + offset1)
* Which this code does.
* mat1 and offset1 come from @child.
*/
graphene_matrix_transform_vec4 (mat1, offset2, &off2);
graphene_vec4_add (&off2, offset1, &off2);
graphene_matrix_multiply (mat1, &mat2, &mat2);
gsk_render_node_unref (child);
child = NULL;
result = gsk_color_matrix_node_new (grandchild, &mat2, &off2);
gsk_render_node_unref (grandchild);
return result;
}
static GskRenderNode *
gtk_snapshot_collect_color_matrix (GtkSnapshot *snapshot,
GtkSnapshotState *state,
GskRenderNode **nodes,
guint n_nodes)
{
GskRenderNode *node, *color_matrix_node;
GskRenderNode *node, *result;
node = gtk_snapshot_collect_default (snapshot, state, nodes, n_nodes);
if (node == NULL)
@ -442,41 +477,19 @@ gtk_snapshot_collect_color_matrix (GtkSnapshot *snapshot,
if (gsk_render_node_get_node_type (node) == GSK_COLOR_MATRIX_NODE)
{
GskRenderNode *child = gsk_render_node_ref (gsk_color_matrix_node_get_child (node));
const graphene_matrix_t *mat1 = gsk_color_matrix_node_peek_color_matrix (node);
graphene_matrix_t mat2;
graphene_vec4_t offset2;
/* color matrix node: color = mat * p + offset; for a pixel p.
* color = mat1 * (mat2 * p + offset2) + offset1;
* = mat1 * mat2 * p + offset2 * mat1 + offset1
* = (mat1 * mat2) * p + (offset2 * mat1 + offset1)
* Which this code does.
* mat1 and offset1 come from @child.
*/
mat2 = state->data.color_matrix.matrix;
offset2 = state->data.color_matrix.offset;
graphene_matrix_transform_vec4 (mat1, &offset2, &offset2);
graphene_vec4_add (&offset2, gsk_color_matrix_node_peek_color_offset (node), &offset2);
graphene_matrix_multiply (mat1, &mat2, &mat2);
gsk_render_node_unref (node);
node = NULL;
color_matrix_node = gsk_color_matrix_node_new (child, &mat2, &offset2);
gsk_render_node_unref (child);
result = merge_color_matrix_nodes (&state->data.color_matrix.matrix,
&state->data.color_matrix.offset,
node);
}
else
{
color_matrix_node = gsk_color_matrix_node_new (node,
&state->data.color_matrix.matrix,
&state->data.color_matrix.offset);
result = gsk_color_matrix_node_new (node,
&state->data.color_matrix.matrix,
&state->data.color_matrix.offset);
gsk_render_node_unref (node);
}
return color_matrix_node;
return result;
}
/**