Add color gradients

docs/dunst.5.pod

@@ -913,6 +913,9 @@ The foreground color of the notification. See COLORS for possible values.
 The highlight color of the notification. This color is used for coloring the
 progress bar. See COLORS for possible values.
 
+You can also set additional color values (as a comma-separated list)
+to define a linear gradient spanning all the length of the progress bar.
+
 =item C<format>
 
 Equivalent to the C<format> setting.

src/dbus.c

@@ -442,6 +442,25 @@ static void color_entry(const struct color c, GVariantDict *dict, const char *fi
         }
 }
 
+static void gradient_entry(const struct gradient *grad, GVariantDict *dict, const char *field_name) {
+        if (GRADIENT_VALID(grad)) {
+                if (grad->length == 1) {
+                        color_entry(grad->colors[0], dict, field_name);
+                        return;
+                }
+
+                char **strv = g_malloc((grad->length + 1) * sizeof(char *));
+                for (int i = 0; i < grad->length; i++) {
+                        char buf[10];
+                        if (color_to_string(grad->colors[i], buf))
+                                strv[i] = g_strdup(buf);
+                }
+                strv[grad->length] = NULL;
+
+                g_variant_dict_insert(dict, field_name, "^as", strv);
+        }
+}
+
 static void dbus_cb_dunst_RuleList(GDBusConnection *connection,
                                    const gchar *sender,
                                    GVariant *parameters,
@@ -543,7 +562,7 @@ static void dbus_cb_dunst_RuleList(GDBusConnection *connection,
                                               enum_to_string(icon_position_enum_data, r->icon_position));
                 color_entry(r->fg, &dict, "fg");
                 color_entry(r->bg, &dict, "bg");
-                color_entry(r->highlight, &dict, "highlight");
+                gradient_entry(r->highlight, &dict, "highlight");
                 color_entry(r->fc, &dict, "fc");
                 if (r->format)
                         g_variant_dict_insert(&dict, "format", "s", r->format);
@@ -838,12 +857,37 @@ static struct notification *dbus_message_to_notification(const gchar *sender, GV
                 g_variant_unref(dict_value);
         }
 
-        if ((dict_value = g_variant_lookup_value(hints, "hlcolor", G_VARIANT_TYPE_STRING))) {
+        if ((dict_value = g_variant_lookup_value(hints, "hlcolor", G_VARIANT_TYPE_STRING_ARRAY))) {
+                char **cols = (char **)g_variant_get_strv(dict_value, NULL);
+                size_t length = g_strv_length(cols);
+                struct gradient *grad = gradient_alloc(length);
+
+                for (int i = 0; i < length; i++) {
+                        if (!string_parse_color(cols[i], &grad->colors[i])) {
+                                g_free(grad);
+                                goto end;
+                        }
+                }
+
+
+                gradient_pattern(grad);
+
+                notification_keep_original(n);
+                if (!GRADIENT_VALID(n->original->highlight)) n->original->highlight = n->colors.highlight;
+                n->colors.highlight = grad;
+
+end:
+                g_variant_unref(dict_value);
+        } else if ((dict_value = g_variant_lookup_value(hints, "hlcolor", G_VARIANT_TYPE_STRING))) {
                 struct color c;
                 if (string_parse_color(g_variant_get_string(dict_value, NULL), &c)) {
+                        struct gradient *grad = gradient_alloc(1);
+                        grad->colors[0] = c;
+                        gradient_pattern(grad);
+
                         notification_keep_original(n);
-                        if (!COLOR_VALID(n->original->highlight)) n->original->highlight = n->colors.highlight;
-                        n->colors.highlight = c;
+                        if (!GRADIENT_VALID(n->original->highlight)) n->original->highlight = n->colors.highlight;
+                        n->colors.highlight = grad;
                 }
                 g_variant_unref(dict_value);
         }

src/draw.c

@@ -71,6 +71,69 @@ char *color_to_string(struct color c, char buf[10])
         return buf;
 }
 
+struct gradient *gradient_alloc(size_t length)
+{
+        if (length == 0)
+                return NULL;
+
+        struct gradient *grad = g_malloc(sizeof(struct gradient) + length * sizeof(struct color));
+
+        grad->length = length;
+        grad->pattern = NULL;
+
+        return grad;
+}
+
+void gradient_free(struct gradient *grad)
+{
+        if (grad == NULL) return;
+
+        if (grad->pattern)
+                cairo_pattern_destroy(grad->pattern);
+
+        g_free(grad);
+}
+
+void gradient_pattern(struct gradient *grad)
+{
+        if (grad->length == 1) {
+                grad->pattern = cairo_pattern_create_rgba(grad->colors[0].r,
+                                                          grad->colors[0].g,
+                                                          grad->colors[0].b,
+                                                          grad->colors[0].a);
+        } else {
+                grad->pattern = cairo_pattern_create_linear(0, 0, 1, 0);
+                for (int i = 0; i < grad->length; i++) {
+                        double offset = i  / (double)(grad->length - 1);
+                        cairo_pattern_add_color_stop_rgba(grad->pattern,
+                                                          offset,
+                                                          grad->colors[i].r,
+                                                          grad->colors[i].g,
+                                                          grad->colors[i].b,
+                                                          grad->colors[i].a);
+                }
+        }
+}
+
+char *gradient_to_string(const struct gradient *grad)
+{
+        if (!GRADIENT_VALID(grad)) return NULL;
+
+        char *buf = g_malloc(grad->length * 11);
+        color_to_string(grad->colors[0], buf);
+        char *ptr = buf + 9;
+
+        for (int i = 1; i < grad->length; i++) {
+                ptr += g_snprintf(ptr, 11, ", #%02x%02x%02x%02x",
+                                  (int)(grad->colors[i].r * 255),
+                                  (int)(grad->colors[i].g * 255),
+                                  (int)(grad->colors[i].b * 255),
+                                  (int)(grad->colors[i].a * 255));
+        }
+
+        return buf;
+}
+
 void draw_setup(void)
 {
         const struct output *out = output_create(settings.force_xwayland);
@@ -320,7 +383,7 @@ static struct colored_layout *layout_init_shared(cairo_t *c, struct notification
 
         // Invalid colors should never reach this point!
         assert(settings.frame_width == 0 || COLOR_VALID(COLOR(cl, frame)));
-        assert(!have_progress_bar(cl) || COLOR_VALID(COLOR(cl, highlight)));
+        assert(!have_progress_bar(cl) || COLOR(cl, highlight) != NULL);
         assert(COLOR_VALID(COLOR(cl, fg)));
         assert(COLOR_VALID(COLOR(cl, bg)));
         return cl;
@@ -828,7 +891,11 @@ static void render_content(cairo_t *c, struct colored_layout *cl, int width, int
                 cairo_fill(c);
 
                 // top layer (fill)
-                cairo_set_source_rgba(c, COLOR(cl, highlight.r), COLOR(cl, highlight.g), COLOR(cl, highlight.b), COLOR(cl, highlight.a));
+                cairo_matrix_t matrix;
+                cairo_matrix_init_scale(&matrix, 1.0 / width, 1.0);
+                cairo_pattern_set_matrix(COLOR(cl, highlight->pattern), &matrix);
+                cairo_set_source(c, COLOR(cl, highlight->pattern));
+
                 draw_rounded_rect(c, x_bar_1, frame_y, progress_width_1, progress_height,
                         settings.progress_bar_corner_radius, scale, settings.progress_bar_corners);
                 cairo_fill(c);

src/draw.h

@@ -53,6 +53,23 @@ struct color {
  */
 char *color_to_string(struct color c, char buf[10]);
 
+struct gradient {
+        cairo_pattern_t *pattern;
+        size_t length;
+        struct color colors[];
+};
+
+#define GRADIENT_VALID(g) ((g) != NULL && (g)->length != 0)
+
+struct gradient *gradient_alloc(size_t length);
+
+void gradient_free(struct gradient *grad);
+
+void gradient_pattern(struct gradient *grad);
+
+char *gradient_to_string(const struct gradient *grad);
+
+
 void draw_setup(void);
 
 void draw(void);

src/dunst.c

@@ -14,6 +14,7 @@
 #include "draw.h"
 #include "log.h"
 #include "menu.h"
+#include "rules.h"
 #include "notification.h"
 #include "option_parser.h"
 #include "queues.h"
@@ -208,6 +209,8 @@ static void teardown(void)
         draw_deinit();
 
         g_strfreev(config_paths);
+
+        g_slist_free_full(rules, (GDestroyNotify)rule_free);
 }
 
 void reload(char **const configs)
@@ -321,6 +324,8 @@ int dunst_main(int argc, char *argv[])
 
         teardown();
 
+        settings_free(&settings);
+
         return 0;
 }
 

src/notification.c

@@ -70,8 +70,12 @@ void notification_print(const struct notification *n)
         char buf[10];
         printf("\tfg: %s\n", STR_NN(color_to_string(n->colors.fg, buf)));
         printf("\tbg: %s\n", STR_NN(color_to_string(n->colors.bg, buf)));
-        printf("\thighlight: %s\n", STR_NN(color_to_string(n->colors.highlight, buf)));
         printf("\tframe: %s\n", STR_NN(color_to_string(n->colors.frame, buf)));
+
+        char *grad = gradient_to_string(n->colors.highlight);
+        printf("\thighlight: %s\n", STR_NN(grad));
+        g_free(grad);
+
         printf("\tfullscreen: %s\n", enum_to_string_fullscreen(n->fullscreen));
         printf("\tformat: %s\n", STR_NN(n->format));
         printf("\tprogress: %d\n", n->progress);
@@ -295,11 +299,7 @@ void notification_unref(struct notification *n)
                 return;
 
         if (n->original) {
-                g_free(n->original->action_name);
-                g_free(n->original->set_category);
-                g_free(n->original->default_icon);
-                g_free(n->original->set_stack_tag);
-                g_free(n->original->new_icon);
+                rule_free(n->original);
                 g_free(n->original);
         }
 
@@ -457,14 +457,16 @@ struct notification *notification_create(void)
         struct color invalid = COLOR_UNINIT;
         n->colors.fg = invalid;
         n->colors.bg = invalid;
-        n->colors.highlight = invalid;
         n->colors.frame = invalid;
+        n->colors.highlight = NULL;
 
         n->script_run = false;
         n->dbus_valid = false;
 
         n->fullscreen = FS_SHOW;
 
+        n->original = NULL;
+
         n->actions = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_free);
         n->default_action_name = g_strdup("default");
 
@@ -508,9 +510,10 @@ void notification_init(struct notification *n)
         }
         if (!COLOR_VALID(n->colors.fg)) n->colors.fg = defcolors.fg;
         if (!COLOR_VALID(n->colors.bg)) n->colors.bg = defcolors.bg;
-        if (!COLOR_VALID(n->colors.highlight)) n->colors.highlight = defcolors.highlight;
         if (!COLOR_VALID(n->colors.frame)) n->colors.frame = defcolors.frame;
 
+        if (!GRADIENT_VALID(n->colors.highlight)) n->colors.highlight = defcolors.highlight;
+
         /* Sanitize misc hints */
         if (n->progress < 0)
                 n->progress = -1;
@@ -783,6 +786,7 @@ void notification_keep_original(struct notification *n)
         if (n->original) return;
         n->original = g_malloc0(sizeof(struct rule));
         *n->original = empty_rule;
+        n->original->name = g_strdup("original");
 }
 
 /* vim: set ft=c tabstop=8 shiftwidth=8 expandtab textwidth=0: */

src/notification.h

@@ -42,7 +42,7 @@ struct notification_colors {
         struct color frame;
         struct color bg;
         struct color fg;
-        struct color highlight;
+        struct gradient *highlight;
 };
 
 struct notification {

src/option_parser.c

@@ -235,6 +235,36 @@ int string_parse_color(const char *s, struct color *ret)
         return true;
 }
 
+int string_parse_gradient(const char *s, struct gradient **ret)
+{
+        struct color colors[10];
+        size_t length = 0;
+
+        gchar **strs = g_strsplit(s, ",", -1);
+        for (int i = 0; strs[i] != NULL; i++) {
+                if (i > 10) {
+                        LOG_W("Do you really need so many colors? ;)");
+                        break;
+                }
+
+                if (!string_parse_color(g_strstrip(strs[i]), &colors[length++])) {
+                        g_strfreev(strs);
+                        return false;
+                }
+        }
+
+        g_strfreev(strs);
+        if (length == 0) {
+                DIE("Unreachable");
+        }
+
+        *ret = gradient_alloc(length);
+        memcpy((*ret)->colors, colors, length * sizeof(struct color));
+        gradient_pattern(*ret);
+
+        return true;
+}
+
 int string_parse_bool(const void *data, const char *s, void *ret)
 {
         // this is needed, since string_parse_enum assumses a
@@ -404,6 +434,8 @@ bool set_from_string(void *target, struct setting setting, const char *value) {
                         return string_parse_length(target, value);
                 case TYPE_COLOR:
                         return string_parse_color(value, target);
+                case TYPE_GRADIENT:
+                        return string_parse_gradient(value, target);
                 default:
                         LOG_W("Setting type of '%s' is not known (type %i)", setting.name, setting.type);
                         return false;

src/option_parser.h

@@ -13,6 +13,7 @@
 int string_parse_enum(const void* data, const char *s, void * ret);
 int string_parse_sepcolor(const void *data, const char *s, void *ret);
 int string_parse_color(const char *s, struct color *ret);
+int string_parse_gradient(const char *s, struct gradient **ret);
 int string_parse_bool(const void *data, const char *s, void *ret);
 int string_parse_corners(const void *data, const char *s, void *ret);
 int string_parse_maybe_int(const void *data, const char *s, void *ret);