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gsk: Implement linear gradient render nodes

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This commit is contained in:
Benjamin Otte 2016-12-15 05:42:31 +01:00
parent cf520b7a1f
commit e8cd71228a
6 changed files with 222 additions and 26 deletions
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2
docs/reference/gsk/gsk4-sections.txt
View File

@ -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

5
gsk/gskenums.h
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@ -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,

20
gsk/gskrendernode.h
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@ -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;
@ -53,6 +60,19 @@ GDK_AVAILABLE_IN_3_90
GskRenderNode * gsk_texture_node_new (GskTexture *texture,
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

156
gsk/gskrendernodeimpl.c
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@ -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;

63
gtk/gtkcssimagelinear.c
View File

@ -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);
cairo_pattern_destroy (pattern);
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);
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;

2
gtk/inspector/gtktreemodelrendernode.c
View File

@ -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;