[gtk+/wip/otte/rendernode: 72/100] gsk: Implement linear gradient render nodes
- From: Benjamin Otte <otte src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk+/wip/otte/rendernode: 72/100] gsk: Implement linear gradient render nodes
- Date: Sun, 18 Dec 2016 06:34:44 +0000 (UTC)
commit 51a617420fd09ccf3b50277e7275ecf56883badc
Author: Benjamin Otte <otte redhat com>
Date: Thu Dec 15 05:42:31 2016 +0100
gsk: Implement linear gradient render nodes
docs/reference/gsk/gsk4-sections.txt | 2 +
gsk/gskenums.h | 5 +
gsk/gskrendernode.h | 20 ++++
gsk/gskrendernodeimpl.c | 156 ++++++++++++++++++++++++++++++++
gtk/gtkcssimagelinear.c | 63 ++++++++------
gtk/inspector/gtktreemodelrendernode.c | 2 +
6 files changed, 222 insertions(+), 26 deletions(-)
---
diff --git a/docs/reference/gsk/gsk4-sections.txt b/docs/reference/gsk/gsk4-sections.txt
index c044864..59e1a39 100644
--- a/docs/reference/gsk/gsk4-sections.txt
+++ b/docs/reference/gsk/gsk4-sections.txt
@@ -33,6 +33,8 @@ GskScalingFilter
gsk_render_node_set_scaling_filters
gsk_render_node_set_name
gsk_color_node_new
+gsk_linear_gradient_node_new
+gsk_repeating_linear_gradient_node_new
gsk_texture_node_new
gsk_cairo_node_new
gsk_cairo_node_get_draw_context
diff --git a/gsk/gskenums.h b/gsk/gskenums.h
index d647495..4e0e0bf 100644
--- a/gsk/gskenums.h
+++ b/gsk/gskenums.h
@@ -28,6 +28,9 @@
* @GSK_CONTAINER_NODE: A node containing a stack of children
* @GSK_CAIRO_NODE: A node drawing a #cairo_surface_t
* @GSK_COLOR_NODE: A node drawing a single color rectangle
+ * @GSK_LINEAR_GRADIENT_NODE: A node drawing a linear gradient
+ * @GSK_REPEATING_LINEAR_GRADIENT_NODE: A node drawing a repeating
+ * linear gradient
* @GSK_TEXTURE_NODE: A node drawing a #GskTexture
* @GSK_TRANSFORM_NODE: A node that renders its child after applying a
* matrix transform
@@ -45,6 +48,8 @@ typedef enum {
GSK_CONTAINER_NODE,
GSK_CAIRO_NODE,
GSK_COLOR_NODE,
+ GSK_LINEAR_GRADIENT_NODE,
+ GSK_REPEATING_LINEAR_GRADIENT_NODE,
GSK_TEXTURE_NODE,
GSK_TRANSFORM_NODE,
GSK_OPACITY_NODE,
diff --git a/gsk/gskrendernode.h b/gsk/gskrendernode.h
index 5d92c73..7562fb9 100644
--- a/gsk/gskrendernode.h
+++ b/gsk/gskrendernode.h
@@ -33,6 +33,13 @@ G_BEGIN_DECLS
#define GSK_IS_RENDER_NODE(obj) ((obj) != NULL)
typedef struct _GskRenderNode GskRenderNode;
+typedef struct _GskColorStop GskColorStop;
+
+struct _GskColorStop
+{
+ double offset;
+ GdkRGBA color;
+};
GDK_AVAILABLE_IN_3_90
GType gsk_render_node_get_type (void) G_GNUC_CONST;
@@ -54,6 +61,19 @@ GskRenderNode * gsk_texture_node_new (GskTexture
const graphene_rect_t *bounds);
GDK_AVAILABLE_IN_3_90
+GskRenderNode * gsk_linear_gradient_node_new (const graphene_rect_t *bounds,
+ const graphene_point_t *start,
+ const graphene_point_t *end,
+ const GskColorStop *color_stops,
+ gsize n_color_stops);
+GDK_AVAILABLE_IN_3_90
+GskRenderNode * gsk_repeating_linear_gradient_node_new (const graphene_rect_t *bounds,
+ const graphene_point_t *start,
+ const graphene_point_t *end,
+ const GskColorStop *color_stops,
+ gsize n_color_stops);
+
+GDK_AVAILABLE_IN_3_90
GskRenderNode * gsk_cairo_node_new (const graphene_rect_t *bounds);
GDK_AVAILABLE_IN_3_90
cairo_t * gsk_cairo_node_get_draw_context (GskRenderNode *node,
diff --git a/gsk/gskrendernodeimpl.c b/gsk/gskrendernodeimpl.c
index 90f90f1..5ab0d22 100644
--- a/gsk/gskrendernodeimpl.c
+++ b/gsk/gskrendernodeimpl.c
@@ -115,6 +115,162 @@ gsk_color_node_new (const GdkRGBA *rgba,
return &self->render_node;
}
+/*** GSK_LINEAR_GRADIENT_NODE ***/
+
+typedef struct _GskLinearGradientNode GskLinearGradientNode;
+
+struct _GskLinearGradientNode
+{
+ GskRenderNode render_node;
+
+ graphene_rect_t bounds;
+
+ graphene_point_t start;
+ graphene_point_t end;
+
+ GskColorStop *stops;
+ gsize n_stops;
+};
+
+static void
+gsk_linear_gradient_node_finalize (GskRenderNode *node)
+{
+ GskLinearGradientNode *self = (GskLinearGradientNode *) node;
+
+ g_free (self->stops);
+}
+
+static void
+gsk_linear_gradient_node_make_immutable (GskRenderNode *node)
+{
+}
+
+static void
+gsk_linear_gradient_node_draw (GskRenderNode *node,
+ cairo_t *cr)
+{
+ GskLinearGradientNode *self = (GskLinearGradientNode *) node;
+ cairo_pattern_t *pattern;
+ gsize i;
+
+ pattern = cairo_pattern_create_linear (self->start.x, self->start.y,
+ self->end.x, self->end.y);
+
+ if (gsk_render_node_get_node_type (node) == GSK_REPEATING_LINEAR_GRADIENT_NODE)
+ cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
+
+ for (i = 0; i < self->n_stops; i++)
+ {
+ cairo_pattern_add_color_stop_rgba (pattern,
+ self->stops[i].offset,
+ self->stops[i].color.red,
+ self->stops[i].color.green,
+ self->stops[i].color.blue,
+ self->stops[i].color.alpha);
+ }
+
+ cairo_set_source (cr, pattern);
+ cairo_pattern_destroy (pattern);
+
+ cairo_rectangle (cr,
+ self->bounds.origin.x, self->bounds.origin.y,
+ self->bounds.size.width, self->bounds.size.height);
+ cairo_fill (cr);
+}
+
+static void
+gsk_linear_gradient_node_get_bounds (GskRenderNode *node,
+ graphene_rect_t *bounds)
+{
+ GskLinearGradientNode *self = (GskLinearGradientNode *) node;
+
+ graphene_rect_init_from_rect (bounds, &self->bounds);
+}
+
+static const GskRenderNodeClass GSK_LINEAR_GRADIENT_NODE_CLASS = {
+ GSK_LINEAR_GRADIENT_NODE,
+ sizeof (GskLinearGradientNode),
+ "GskLinearGradientNode",
+ gsk_linear_gradient_node_finalize,
+ gsk_linear_gradient_node_make_immutable,
+ gsk_linear_gradient_node_draw,
+ gsk_linear_gradient_node_get_bounds
+};
+
+static const GskRenderNodeClass GSK_REPEATING_LINEAR_GRADIENT_NODE_CLASS = {
+ GSK_REPEATING_LINEAR_GRADIENT_NODE,
+ sizeof (GskLinearGradientNode),
+ "GskLinearGradientNode",
+ gsk_linear_gradient_node_finalize,
+ gsk_linear_gradient_node_make_immutable,
+ gsk_linear_gradient_node_draw,
+ gsk_linear_gradient_node_get_bounds
+};
+
+/**
+ * gsk_linear_gradient_node_new:
+ * @linear_gradient: the #GskLinearGradient
+ * @bounds: the rectangle to render the linear_gradient into
+ *
+ * Creates a #GskRenderNode that will render the given
+ * @linear_gradient into the area given by @bounds.
+ *
+ * Returns: A new #GskRenderNode
+ *
+ * Since: 3.90
+ */
+GskRenderNode *
+gsk_linear_gradient_node_new (const graphene_rect_t *bounds,
+ const graphene_point_t *start,
+ const graphene_point_t *end,
+ const GskColorStop *color_stops,
+ gsize n_color_stops)
+{
+ GskLinearGradientNode *self;
+
+ g_return_val_if_fail (bounds != NULL, NULL);
+ g_return_val_if_fail (start != NULL, NULL);
+ g_return_val_if_fail (end != NULL, NULL);
+ g_return_val_if_fail (color_stops != NULL, NULL);
+
+ self = (GskLinearGradientNode *) gsk_render_node_new (&GSK_LINEAR_GRADIENT_NODE_CLASS);
+
+ graphene_rect_init_from_rect (&self->bounds, bounds);
+ graphene_point_init_from_point (&self->start, start);
+ graphene_point_init_from_point (&self->end, end);
+
+ self->stops = g_memdup (color_stops, sizeof (GskColorStop) * n_color_stops);
+ self->n_stops = n_color_stops;
+
+ return &self->render_node;
+}
+
+GskRenderNode *
+gsk_repeating_linear_gradient_node_new (const graphene_rect_t *bounds,
+ const graphene_point_t *start,
+ const graphene_point_t *end,
+ const GskColorStop *color_stops,
+ gsize n_color_stops)
+{
+ GskLinearGradientNode *self;
+
+ g_return_val_if_fail (bounds != NULL, NULL);
+ g_return_val_if_fail (start != NULL, NULL);
+ g_return_val_if_fail (end != NULL, NULL);
+ g_return_val_if_fail (color_stops != NULL, NULL);
+
+ self = (GskLinearGradientNode *) gsk_render_node_new (&GSK_REPEATING_LINEAR_GRADIENT_NODE_CLASS);
+
+ graphene_rect_init_from_rect (&self->bounds, bounds);
+ graphene_point_init_from_point (&self->start, start);
+ graphene_point_init_from_point (&self->end, end);
+
+ self->stops = g_memdup (color_stops, sizeof (GskColorStop) * n_color_stops);
+ self->n_stops = n_color_stops;
+
+ return &self->render_node;
+}
+
/*** GSK_TEXTURE_NODE ***/
typedef struct _GskTextureNode GskTextureNode;
diff --git a/gtk/gtkcssimagelinear.c b/gtk/gtkcssimagelinear.c
index 07ab3ea..0e415d6 100644
--- a/gtk/gtkcssimagelinear.c
+++ b/gtk/gtkcssimagelinear.c
@@ -128,19 +128,22 @@ gtk_css_image_linear_compute_start_point (double angle_in_degrees,
}
static void
-gtk_css_image_linear_draw (GtkCssImage *image,
- cairo_t *cr,
- double width,
- double height)
+gtk_css_image_linear_snapshot (GtkCssImage *image,
+ GtkSnapshot *snapshot,
+ double width,
+ double height)
{
GtkCssImageLinear *linear = GTK_CSS_IMAGE_LINEAR (image);
- cairo_pattern_t *pattern;
+ GskColorStop stops[linear->stops->len];
+ GskRenderNode *node;
+ double off_x, off_y; /* snapshot offset */
double angle; /* actual angle of the gradiant line in degrees */
double x, y; /* coordinates of start point */
double length; /* distance in pixels for 100% */
double start, end; /* position of first/last point on gradient line - with gradient line being [0, 1] */
double offset;
int i, last;
+ char *name;
if (linear->side)
{
@@ -177,12 +180,6 @@ gtk_css_image_linear_draw (GtkCssImage *image,
length = sqrt (x * x + y * y);
gtk_css_image_linear_get_start_end (linear, length, &start, &end);
- pattern = cairo_pattern_create_linear (x * (start - 0.5), y * (start - 0.5),
- x * (end - 0.5), y * (end - 0.5));
- if (linear->repeating)
- cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
- else
- cairo_pattern_set_extend (pattern, CAIRO_EXTEND_PAD);
offset = start;
last = -1;
@@ -209,31 +206,45 @@ gtk_css_image_linear_draw (GtkCssImage *image,
step = (pos - offset) / (i - last);
for (last = last + 1; last <= i; last++)
{
- const GdkRGBA *rgba;
-
stop = &g_array_index (linear->stops, GtkCssImageLinearColorStop, last);
- rgba = _gtk_css_rgba_value_get_rgba (stop->color);
offset += step;
- cairo_pattern_add_color_stop_rgba (pattern,
- (offset - start) / (end - start),
- rgba->red,
- rgba->green,
- rgba->blue,
- rgba->alpha);
+ stops[last].offset = (offset - start) / (end - start);
+ stops[last].color = *_gtk_css_rgba_value_get_rgba (stop->color);
}
offset = pos;
last = i;
}
- cairo_rectangle (cr, 0, 0, width, height);
- cairo_translate (cr, width / 2, height / 2);
- cairo_set_source (cr, pattern);
- cairo_fill (cr);
+ gtk_snapshot_get_offset (snapshot, &off_x, &off_y);
+
+ if (linear->repeating)
+ {
+ node = gsk_repeating_linear_gradient_node_new (
+ &GRAPHENE_RECT_INIT (off_x, off_y, width, height),
+ &GRAPHENE_POINT_INIT (off_x + width / 2 + x * (start - 0.5), off_y + height / 2 + y * (start -
0.5)),
+ &GRAPHENE_POINT_INIT (off_x + width / 2 + x * (end - 0.5), off_y + height / 2 + y * (end - 0.5)),
+ stops,
+ linear->stops->len);
+ }
+ else
+ {
+ node = gsk_linear_gradient_node_new (
+ &GRAPHENE_RECT_INIT (off_x, off_y, width, height),
+ &GRAPHENE_POINT_INIT (off_x + width / 2 + x * (start - 0.5), off_y + height / 2 + y * (start -
0.5)),
+ &GRAPHENE_POINT_INIT (off_x + width / 2 + x * (end - 0.5), off_y + height / 2 + y * (end - 0.5)),
+ stops,
+ linear->stops->len);
+ }
+ name = g_strdup_printf ("%sLinearGradient<%ustops>", linear->repeating ? "Repeating" : "",
linear->stops->len);
+ gsk_render_node_set_name (node, name);
+ g_free (name);
+
+ gtk_snapshot_append_node (snapshot, node);
- cairo_pattern_destroy (pattern);
+ gsk_render_node_unref (node);
}
@@ -604,7 +615,7 @@ _gtk_css_image_linear_class_init (GtkCssImageLinearClass *klass)
GtkCssImageClass *image_class = GTK_CSS_IMAGE_CLASS (klass);
GObjectClass *object_class = G_OBJECT_CLASS (klass);
- image_class->draw = gtk_css_image_linear_draw;
+ image_class->snapshot = gtk_css_image_linear_snapshot;
image_class->parse = gtk_css_image_linear_parse;
image_class->print = gtk_css_image_linear_print;
image_class->compute = gtk_css_image_linear_compute;
diff --git a/gtk/inspector/gtktreemodelrendernode.c b/gtk/inspector/gtktreemodelrendernode.c
index 5426250..6ac5b32 100644
--- a/gtk/inspector/gtktreemodelrendernode.c
+++ b/gtk/inspector/gtktreemodelrendernode.c
@@ -525,6 +525,8 @@ append_node (GtkTreeModelRenderNode *nodemodel,
case GSK_CAIRO_NODE:
case GSK_TEXTURE_NODE:
case GSK_COLOR_NODE:
+ case GSK_LINEAR_GRADIENT_NODE:
+ case GSK_REPEATING_LINEAR_GRADIENT_NODE:
/* no children */
break;
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