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cssimage: Implement snapshot() for cross-fade

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This commit is contained in:
Benjamin Otte 2016-12-17 08:07:29 +01:00
parent 9822fe81a3
commit 8ad7c435ca
1 changed files with 47 additions and 34 deletions
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81
gtk/gtkcssimagecrossfade.c
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@ -99,55 +99,68 @@ gtk_css_image_cross_fade_equal (GtkCssImage *image1,
}
static void
gtk_css_image_cross_fade_draw (GtkCssImage *image,
cairo_t *cr,
double width,
double height)
gtk_css_image_cross_fade_snapshot (GtkCssImage *image,
GtkSnapshot *snapshot,
double width,
double height)
{
GtkCssImageCrossFade *cross_fade = GTK_CSS_IMAGE_CROSS_FADE (image);
if (cross_fade->progress <= 0.0)
{
if (cross_fade->start)
_gtk_css_image_draw (cross_fade->start, cr, width, height);
gtk_css_image_snapshot (cross_fade->start, snapshot, width, height);
}
else if (cross_fade->progress >= 1.0)
{
if (cross_fade->end)
_gtk_css_image_draw (cross_fade->end, cr, width, height);
gtk_css_image_snapshot (cross_fade->end, snapshot, width, height);
}
else
{
if (cross_fade->start && cross_fade->end)
GskRenderNode *start_node, *end_node;
if (cross_fade->start)
{
/* to reduce the group size */
cairo_rectangle (cr, 0, 0, ceil (width), ceil (height));
cairo_clip (cr);
cairo_push_group (cr);
/* performance trick */
cairo_reset_clip (cr);
_gtk_css_image_draw (cross_fade->start, cr, width, height);
cairo_push_group (cr);
_gtk_css_image_draw (cross_fade->end, cr, width, height);
cairo_pop_group_to_source (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_paint_with_alpha (cr, cross_fade->progress);
cairo_pop_group_to_source (cr);
cairo_paint (cr);
gtk_snapshot_push (snapshot, TRUE, "CrossFadeStart");
gtk_css_image_snapshot (cross_fade->start, snapshot, width, height);
start_node = gtk_snapshot_pop (snapshot);
}
else if (cross_fade->start || cross_fade->end)
{
cairo_push_group (cr);
_gtk_css_image_draw (cross_fade->start ? cross_fade->start : cross_fade->end, cr, width, height);
cairo_pop_group_to_source (cr);
else
start_node = NULL;
cairo_paint_with_alpha (cr, cross_fade->start ? 1.0 - cross_fade->progress : cross_fade->progress);
if (cross_fade->end)
{
gtk_snapshot_push (snapshot, TRUE, "CrossFadeStart");
gtk_css_image_snapshot (cross_fade->end, snapshot, width, height);
end_node = gtk_snapshot_pop (snapshot);
}
else
end_node = NULL;
if (start_node && end_node)
{
GskRenderNode *node = gsk_cross_fade_node_new (start_node, end_node, cross_fade->progress);
gsk_render_node_set_name (node, "CrossFade");
gtk_snapshot_append_node (snapshot, node);
gsk_render_node_unref (node);
gsk_render_node_unref (start_node);
gsk_render_node_unref (end_node);
}
else if (start_node)
{
gtk_snapshot_push_opacity (snapshot, cross_fade->progress, "CrossFadeStart");
gtk_snapshot_append_node (snapshot, start_node);
gtk_snapshot_pop_and_append (snapshot);
gsk_render_node_unref (start_node);
}
else if (end_node)
{
gtk_snapshot_push_opacity (snapshot, 1.0 - cross_fade->progress, "CrossFadeEnd");
gtk_snapshot_append_node (snapshot, end_node);
gtk_snapshot_pop_and_append (snapshot);
gsk_render_node_unref (end_node);
}
}
}
@ -268,7 +281,7 @@ _gtk_css_image_cross_fade_class_init (GtkCssImageCrossFadeClass *klass)
image_class->get_width = gtk_css_image_cross_fade_get_width;
image_class->get_height = gtk_css_image_cross_fade_get_height;
image_class->equal = gtk_css_image_cross_fade_equal;
image_class->draw = gtk_css_image_cross_fade_draw;
image_class->snapshot = gtk_css_image_cross_fade_snapshot;
image_class->parse = gtk_css_image_cross_fade_parse;
image_class->print = gtk_css_image_cross_fade_print;
image_class->compute = gtk_css_image_cross_fade_compute;