return GTK_CSS_IMAGE (copy);
}
+cairo_pattern_t *
+fade_pattern (cairo_pattern_t *pattern,
+ double opacity)
+{
+ double x0, y0, x1, y1, r0, r1;
+ cairo_pattern_t *result;
+ int i, n;
+
+ switch (cairo_pattern_get_type (pattern))
+ {
+ case CAIRO_PATTERN_TYPE_LINEAR:
+ cairo_pattern_get_linear_points (pattern, &x0, &y0, &x1, &y1);
+ result = cairo_pattern_create_linear (x0, y0, x1, y1);
+ break;
+ case CAIRO_PATTERN_TYPE_RADIAL:
+ cairo_pattern_get_radial_circles (pattern, &x0, &y0, &r0, &x1, &y1, &r1);
+ result = cairo_pattern_create_radial (x0, y0, r0, x1, y1, r1);
+ break;
+ default:
+ g_return_val_if_reached (NULL);
+ }
+
+ cairo_pattern_get_color_stop_count (pattern, &n);
+ for (i = 0; i < n; i++)
+ {
+ double o, r, g, b, a;
+
+ cairo_pattern_get_color_stop_rgba (pattern, i, &o, &r, &g, &b, &a);
+ cairo_pattern_add_color_stop_rgba (result, o, r, g, b, a * opacity);
+ }
+
+ return pattern;
+}
+
+cairo_pattern_t *
+transition_pattern (cairo_pattern_t *start,
+ cairo_pattern_t *end,
+ double progress)
+{
+ double sx0, sy0, sx1, sy1, sr0, sr1, ex0, ey0, ex1, ey1, er0, er1;
+ cairo_pattern_t *result;
+ int i, n;
+
+ progress = CLAMP (progress, 0.0, 1.0);
+
+ if (end == NULL)
+ return fade_pattern (start, 1.0 - progress);
+
+ g_assert (cairo_pattern_get_type (start) == cairo_pattern_get_type (end));
+
+ switch (cairo_pattern_get_type (start))
+ {
+ case CAIRO_PATTERN_TYPE_LINEAR:
+ cairo_pattern_get_linear_points (start, &sx0, &sy0, &sx1, &sy1);
+ cairo_pattern_get_linear_points (start, &ex0, &ey0, &ex1, &ey1);
+ result = cairo_pattern_create_linear ((1 - progress) * sx0 + progress * ex0,
+ (1 - progress) * sx1 + progress * ex1,
+ (1 - progress) * sy0 + progress * ey0,
+ (1 - progress) * sy1 + progress * ey1);
+ break;
+ case CAIRO_PATTERN_TYPE_RADIAL:
+ cairo_pattern_get_radial_circles (start, &sx0, &sy0, &sr0, &sx1, &sy1, &sr1);
+ cairo_pattern_get_radial_circles (start, &ex0, &ey0, &er0, &ex1, &ey1, &er1);
+ result = cairo_pattern_create_radial ((1 - progress) * sx0 + progress * ex0,
+ (1 - progress) * sy0 + progress * ey0,
+ (1 - progress) * sr0 + progress * er0,
+ (1 - progress) * sx1 + progress * ex1,
+ (1 - progress) * sy1 + progress * ey1,
+ (1 - progress) * sr1 + progress * er1);
+ break;
+ default:
+ g_return_val_if_reached (NULL);
+ }
+
+ cairo_pattern_get_color_stop_count (start, &n);
+ for (i = 0; i < n; i++)
+ {
+ double so, sr, sg, sb, sa, eo, er, eg, eb, ea;
+
+ cairo_pattern_get_color_stop_rgba (start, i, &so, &sr, &sg, &sb, &sa);
+ cairo_pattern_get_color_stop_rgba (start, i, &eo, &er, &eg, &eb, &ea);
+
+ cairo_pattern_add_color_stop_rgba (result,
+ (1 - progress) * so + progress * eo,
+ (1 - progress) * sr + progress * er,
+ (1 - progress) * sg + progress * eg,
+ (1 - progress) * sb + progress * eb,
+ (1 - progress) * sa + progress * ea);
+ }
+
+ return result;
+}
+
+GtkCssImage *
+gtk_css_image_gradient_transition (GtkCssImage *start_image,
+ GtkCssImage *end_image,
+ guint property_id,
+ double progress)
+{
+ GtkGradient *start_gradient, *end_gradient, *gradient;
+ cairo_pattern_t *start_pattern, *end_pattern;
+ GtkCssImageGradient *result;
+
+ start_gradient = GTK_CSS_IMAGE_GRADIENT (start_image)->gradient;
+ start_pattern = GTK_CSS_IMAGE_GRADIENT (start_image)->pattern;
+ if (end_image == NULL)
+ {
+ end_gradient = NULL;
+ end_pattern = NULL;
+ }
+ else
+ {
+ if (!GTK_IS_CSS_IMAGE_GRADIENT (end_image))
+ return GTK_CSS_IMAGE_CLASS (_gtk_css_image_gradient_parent_class)->transition (start_image, end_image, property_id, progress);
+
+ end_gradient = GTK_CSS_IMAGE_GRADIENT (end_image)->gradient;
+ end_pattern = GTK_CSS_IMAGE_GRADIENT (end_image)->pattern;
+ }
+
+ gradient = _gtk_gradient_transition (start_gradient, end_gradient, property_id, progress);
+ if (gradient == NULL)
+ return GTK_CSS_IMAGE_CLASS (_gtk_css_image_gradient_parent_class)->transition (start_image, end_image, property_id, progress);
+
+ result = g_object_new (GTK_TYPE_CSS_IMAGE_GRADIENT, NULL);
+ result->gradient = gradient;
+ result->pattern = transition_pattern (start_pattern, end_pattern, progress);
+
+ return GTK_CSS_IMAGE (result);
+}
+
static gboolean
gtk_css_image_gradient_draw_circle (GtkCssImageGradient *image,
cairo_t *cr,
GObjectClass *object_class = G_OBJECT_CLASS (klass);
image_class->compute = gtk_css_image_gradient_compute;
+ image_class->transition = gtk_css_image_gradient_transition;
image_class->draw = gtk_css_image_gradient_draw;
image_class->parse = gtk_css_image_gradient_parse;
image_class->print = gtk_css_image_gradient_print;
return g_string_free (str, FALSE);
}
+
+static GtkGradient *
+gtk_gradient_fade (GtkGradient *gradient,
+ double opacity)
+{
+ GtkGradient *faded;
+ guint i;
+
+ faded = g_slice_new (GtkGradient);
+ faded->stops = g_array_new (FALSE, FALSE, sizeof (ColorStop));
+
+ faded->x0 = gradient->x0;
+ faded->y0 = gradient->y0;
+ faded->x1 = gradient->x1;
+ faded->y1 = gradient->y1;
+ faded->radius0 = gradient->radius0;
+ faded->radius1 = gradient->radius1;
+
+ faded->ref_count = 1;
+
+ for (i = 0; i < gradient->stops->len; i++)
+ {
+ GtkSymbolicColor *color;
+ ColorStop *stop;
+
+ stop = &g_array_index (gradient->stops, ColorStop, i);
+ color = gtk_symbolic_color_new_alpha (stop->color, opacity);
+ gtk_gradient_add_color_stop (gradient, stop->offset, color);
+ gtk_symbolic_color_unref (color);
+ }
+
+ return faded;
+}
+
+GtkGradient *
+_gtk_gradient_transition (GtkGradient *start,
+ GtkGradient *end,
+ guint property_id,
+ double progress)
+{
+ GtkGradient *gradient;
+ guint i;
+
+ g_return_val_if_fail (start != NULL, NULL);
+
+ if (end == NULL)
+ return gtk_gradient_fade (start, 1.0 - CLAMP (progress, 0.0, 1.0));
+
+ if (start->stops->len != end->stops->len)
+ return NULL;
+
+ /* check both are radial/linear */
+ if ((start->radius0 == 0 && start->radius1 == 0) != (end->radius0 == 0 && end->radius1 == 0))
+ return NULL;
+
+ gradient = g_slice_new (GtkGradient);
+ gradient->stops = g_array_new (FALSE, FALSE, sizeof (ColorStop));
+
+ gradient->x0 = (1 - progress) * start->x0 + progress * end->x0;
+ gradient->y0 = (1 - progress) * start->y0 + progress * end->y0;
+ gradient->x1 = (1 - progress) * start->x1 + progress * end->x1;
+ gradient->y1 = (1 - progress) * start->y1 + progress * end->y1;
+ gradient->radius0 = (1 - progress) * start->radius0 + progress * end->radius0;
+ gradient->radius1 = (1 - progress) * start->radius1 + progress * end->radius1;
+
+ gradient->ref_count = 1;
+
+ for (i = 0; i < start->stops->len; i++)
+ {
+ ColorStop *start_stop, *end_stop;
+ GtkSymbolicColor *color;
+ double offset;
+
+ start_stop = &g_array_index (start->stops, ColorStop, i);
+ end_stop = &g_array_index (end->stops, ColorStop, i);
+
+ offset = (1 - progress) * start_stop->offset + progress * end_stop->offset;
+ color = (GtkSymbolicColor *) _gtk_css_value_transition ((GtkCssValue *) start_stop->color,
+ (GtkCssValue *) end_stop->color,
+ property_id,
+ progress);
+ g_assert (color);
+ gtk_gradient_add_color_stop (gradient, offset, color);
+ gtk_symbolic_color_unref (color);
+ }
+
+ return gradient;
+}
projects / gtk4.git / commitdiff