initial gtk2 "transparent" background attempt

3 files changed, 456 insertions, 0 deletions

diff --git a/libtopmenu-common/Makefile.am b/libtopmenu-common/Makefile.am
new file mode 100644
index 0000000..7316058
--- /dev/null
+++ b/libtopmenu-common/Makefile.am
@@ -0,0 +1,17 @@
+if GTK3
+
+lib_LTLIBRARIES = libtopmenu-common-gtk3.la
+libtopmenu_common_gtk3_la_SOURCES = topmenu-background.c topmenu-background.h
+libtopmenu_common_gtk3_la_CPPFLAGS = $(GTK_CFLAGS) -DG_LOG_DOMAIN=\"topmenu-common\"
+libtopmenu_common_gtk3_la_LIBADD = $(GTK_LIBS)
+
+else
+
+lib_LTLIBRARIES = libtopmenu-common-gtk2.la
+libtopmenu_common_gtk2_la_SOURCES = topmenu-background.c topmenu-background.h
+libtopmenu_common_gtk2_la_CPPFLAGS = $(GTK_CFLAGS) -DG_LOG_DOMAIN=\"topmenu-common\"
+libtopmenu_common_gtk2_la_LIBADD = $(GTK_LIBS)
+
+endif
+
+include_HEADERS = topmenu-background.h
diff --git a/libtopmenu-common/topmenu-background.c b/libtopmenu-common/topmenu-background.c
new file mode 100644
index 0000000..99d36e9
--- /dev/null
+++ b/libtopmenu-common/topmenu-background.c
@@ -0,0 +1,365 @@
+/*
+ * Copyright 2014-2015 Javier S. Pedro <dev.git@javispedro.com>
+ *
+ * This file is part of TopMenu.
+ *
+ * TopMenu is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * TopMenu is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with TopMenu.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <math.h>
+#include <cairo-xlib.h>
+#include "topmenu-background.h"
+
+struct _TopMenuBackgroundPrivate
+{
+	double red, green, blue, alpha;
+	Pixmap pixmap;
+	gint width, height, depth;
+	gboolean has_color;
+};
+
+enum {
+	SIGNAL_CHANGED,
+	N_SIGNALS
+};
+
+G_DEFINE_TYPE(TopMenuBackground, topmenu_background, G_TYPE_OBJECT)
+
+#define TOPMENU_BACKGROUND_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE((obj), TOPMENU_TYPE_BACKGROUND, TopMenuBackgroundPrivate))
+
+static guint signals[N_SIGNALS];
+
+static inline GdkDisplay * topmenu_background_get_display(TopMenuBackground *self)
+{
+	return gdk_display_get_default();
+}
+
+static gboolean topmenu_background_reset(TopMenuBackground *self)
+{
+	gboolean had_contents = self->priv->has_color || self->priv->pixmap;
+	self->priv->has_color = FALSE;
+	if (self->priv->pixmap) {
+		GdkDisplay *display = topmenu_background_get_display(self);
+		XFreePixmap(GDK_DISPLAY_XDISPLAY(display), self->priv->pixmap);
+		self->priv->pixmap = None;
+	}
+	return had_contents;
+}
+
+static void topmenu_background_finalize(GObject *obj)
+{
+	TopMenuBackground *self = TOPMENU_BACKGROUND(obj);
+	topmenu_background_clear(self);
+	G_OBJECT_CLASS(topmenu_background_parent_class)->finalize(obj);
+}
+
+static void topmenu_background_class_init(TopMenuBackgroundClass *klass)
+{
+	GObjectClass *obj_class = G_OBJECT_CLASS(klass);
+	obj_class->finalize = topmenu_background_finalize;
+
+	signals[SIGNAL_CHANGED] = g_signal_newv("changed",
+	                                        G_TYPE_FROM_CLASS(obj_class),
+	                                        G_SIGNAL_NO_RECURSE,
+	                                        NULL,
+	                                        NULL,
+	                                        NULL,
+	                                        g_cclosure_marshal_VOID__VOID,
+	                                        G_TYPE_NONE,
+	                                        0, NULL);
+
+	g_type_class_add_private(klass, sizeof(TopMenuBackgroundPrivate));
+}
+
+static void topmenu_background_init(TopMenuBackground *self)
+{
+	self->priv = TOPMENU_BACKGROUND_GET_PRIVATE(self);
+}
+
+TopMenuBackground *topmenu_background_new(void)
+{
+	return TOPMENU_BACKGROUND(g_object_new(TOPMENU_TYPE_BACKGROUND, NULL));
+}
+
+void topmenu_background_set_from_color(TopMenuBackground *self, double red, double green, double blue, double alpha)
+{
+	if (self->priv->has_color
+	        && self->priv->red == red && self->priv->green == green
+	        && self->priv->blue == blue && self->priv->alpha == alpha) {
+		return; // Nothing to do
+	}
+
+	topmenu_background_reset(self);
+
+	self->priv->has_color = TRUE;
+	self->priv->red = red;
+	self->priv->green = green;
+	self->priv->blue = blue;
+	self->priv->alpha = alpha;
+	g_signal_emit(self, signals[SIGNAL_CHANGED], 0);
+}
+
+void topmenu_background_set_from_drawable(TopMenuBackground *self, Drawable drawable)
+{
+	gboolean had_contents = topmenu_background_reset(self);
+
+	g_return_if_fail(drawable);
+
+	GdkDisplay *display = topmenu_background_get_display(self);
+	GdkScreen *screen = gdk_display_get_default_screen(display);
+	Display *xdpy = GDK_DISPLAY_XDISPLAY(display);
+	int err;
+
+	gdk_error_trap_push();
+
+	Window root;
+	int x, y;
+	unsigned int width, height, border_width, depth;
+	if (!XGetGeometry(xdpy, drawable, &root,
+	                 &x, &y, &width, &height, &border_width, &depth)) {
+		g_debug("could not get geometry of drawable: 0x%lx", drawable);
+		goto err_out;
+	}
+
+	self->priv->width = width;
+	self->priv->height = height;
+	self->priv->depth = depth;
+
+	cairo_surface_t *orig_surface = cairo_xlib_surface_create(xdpy, drawable,
+	            GDK_VISUAL_XVISUAL(gdk_screen_get_system_visual(screen)),
+	            width, height);
+	if (!orig_surface) {
+		g_debug("could not create orig surface");
+		goto err_out;
+	}
+
+	self->priv->pixmap = XCreatePixmap(xdpy, drawable, width, height, depth);
+	cairo_surface_t *new_surface = cairo_xlib_surface_create(xdpy, self->priv->pixmap,
+	            GDK_VISUAL_XVISUAL(gdk_screen_get_system_visual(screen)),
+				width, height);
+	if (!new_surface) {
+		g_debug("could not create new surface");
+		goto err_out;
+	}
+
+	cairo_t *cr = cairo_create(new_surface);
+	cairo_set_source_surface(cr, orig_surface, 0, 0);
+	cairo_paint(cr);
+	cairo_destroy(cr);
+
+	cairo_surface_destroy(new_surface);
+	cairo_surface_destroy(orig_surface);
+
+err_out:
+	err = gdk_error_trap_pop();
+	if (err) g_debug("X error: %d", err);
+
+	if (had_contents || self->priv->pixmap) {
+		g_signal_emit(self, signals[SIGNAL_CHANGED], 0);
+	}
+}
+
+void topmenu_background_set_from_cairo_pattern(TopMenuBackground *self, cairo_pattern_t *pattern)
+{
+	if (!pattern) {
+		topmenu_background_clear(self);
+		return;
+	}
+
+	gboolean had_contents = topmenu_background_reset(self);
+
+	cairo_surface_t *surface;
+	double red, green, blue, alpha;
+	if (cairo_pattern_get_rgba(pattern, &red, &green, &blue, &alpha) == CAIRO_STATUS_SUCCESS) {
+		topmenu_background_set_from_color(self, red, green, blue, alpha);
+	} else if (cairo_pattern_get_surface(pattern, &surface) == CAIRO_STATUS_SUCCESS) {
+		cairo_surface_type_t type = cairo_surface_get_type(surface);
+		if (type == CAIRO_SURFACE_TYPE_XLIB) {
+			Drawable drawable = cairo_xlib_surface_get_drawable(surface);
+			topmenu_background_set_from_drawable(self, drawable);
+			return;
+		} else {
+			g_warning("no idea how to handle this cairo pattern type");
+		}
+	} else {
+		g_warning("no idea how to handle this cairo surface type");
+	}
+
+	if (had_contents) {
+		g_signal_emit(self, signals[SIGNAL_CHANGED], 0);
+	}
+}
+
+void topmenu_background_clear(TopMenuBackground *self)
+{
+	if (topmenu_background_reset(self)) {
+		g_signal_emit(self, signals[SIGNAL_CHANGED], 0);
+	}
+}
+
+gboolean topmenu_background_get_color(TopMenuBackground *self, double *red, double *green, double *blue, double *alpha)
+{
+	if (self->priv->has_color) {
+		if (red) *red = self->priv->red;
+		if (green) *green = self->priv->green;
+		if (blue) *blue = self->priv->blue;
+		if (alpha) *alpha = self->priv->alpha;
+		return TRUE;
+	} else {
+		return FALSE;
+	}
+}
+
+gboolean topmenu_background_get_pixmap(TopMenuBackground *self, Pixmap *pixmap)
+{
+	if (self->priv->pixmap) {
+		if (pixmap) *pixmap = self->priv->pixmap;
+		return TRUE;
+	} else {
+		return FALSE;
+	}
+}
+
+cairo_pattern_t * topmenu_background_get_cairo_pattern(TopMenuBackground *self)
+{
+	if (self->priv->has_color) {
+		return cairo_pattern_create_rgba(self->priv->red, self->priv->green,
+		                                 self->priv->blue, self->priv->alpha);
+	} else if (self->priv->pixmap) {
+		GdkDisplay *display = topmenu_background_get_display(self);
+		GdkScreen *screen = gdk_display_get_default_screen(display);
+		Display *xdpy = GDK_DISPLAY_XDISPLAY(display);
+
+		cairo_surface_t * surface = cairo_xlib_surface_create(xdpy, self->priv->pixmap,
+			GDK_VISUAL_XVISUAL(gdk_screen_get_system_visual(screen)),
+			self->priv->width, self->priv->height);
+
+		cairo_pattern_t * pattern = cairo_pattern_create_for_surface(surface);
+		cairo_surface_destroy(surface);
+
+		return pattern;
+	} else {
+		return NULL;
+	}
+}
+
+void topmenu_background_fill_client_message(TopMenuBackground *self, XClientMessageEvent *event)
+{
+	event->format = 32;
+	event->data.l[0] = self->priv->has_color ? 1 : 0;
+	if (self->priv->has_color) {
+		// Encode color as a 32-bit RGBA value
+		guint32 rgba = (lround(self->priv->red   * 255.0) & 0xFF) << 24
+		             | (lround(self->priv->green * 255.0) & 0xFF) << 16
+		             | (lround(self->priv->blue  * 255.0) & 0xFF) << 8
+		             | (lround(self->priv->alpha * 255.0) & 0xFF) << 0;
+		event->data.l[1] = rgba;
+	} else {
+		event->data.l[1] = 0;
+	}
+	event->data.l[2] = self->priv->pixmap;
+	event->data.l[3] = 0;
+	event->data.l[4] = 0;
+}
+
+void topmenu_background_set_from_client_message(TopMenuBackground *self, XClientMessageEvent *event)
+{
+	g_return_if_fail(event->format == 32);
+	g_warn_if_fail(event->data.l[3] == 0);
+	if (event->data.l[0] & 1) {
+		const guint32 rgba = event->data.l[1];
+		double red   = ((rgba >> 24) & 0xFF) / 255.0,
+		       green = ((rgba >> 16) & 0xFF) / 255.0,
+		       blue = ((rgba >> 8) & 0xFF) / 255.0,
+		       alpha = ((rgba >> 0) & 0xFF) / 255.0;
+		g_debug("received color %.2f,%.2f,%.2f,%.2f", red, green, blue, alpha);
+		topmenu_background_set_from_color(self, red, green, blue, alpha);
+	} else if (event->data.l[2] != None) {
+		g_debug("received pixmap 0x%lx", event->data.l[2]);
+		topmenu_background_set_from_drawable(self, event->data.l[2]);
+	} else {
+		g_debug("received nothing");
+		topmenu_background_clear(self);
+	}
+}
+
+#if GTK_MAJOR_VERSION == 2
+static GdkPixmap * get_pixmap(GdkDisplay *display, Pixmap pixmap)
+{
+	gdk_error_trap_push();
+	GdkPixmap *gp = gdk_pixmap_lookup_for_display(display, pixmap);
+	if (!gp) {
+		gp = gdk_pixmap_foreign_new_for_display(display, pixmap);
+	}
+	gdk_error_trap_pop();
+	return gp;
+}
+#endif
+
+void topmenu_background_apply(TopMenuBackground *self, GtkWidget *widget)
+{
+#if GTK_MAJOR_VERSION == 3
+	g_debug("background set not yet supported on Gtk+ 3");
+#elif GTK_MAJOR_VERSION == 2
+	// Clear current background
+	GtkRcStyle *rc_style;
+	gtk_widget_set_style(widget, NULL);
+	rc_style = gtk_rc_style_new();
+	gtk_widget_modify_style(widget, rc_style);
+	g_object_unref(rc_style);
+
+	double red, green, blue, alpha;
+	Pixmap pixmap;
+	if (topmenu_background_get_color(self, &red, &green, &blue, &alpha)) {
+		if (alpha >= 1.0) {
+			// Opaque
+			GdkColor color = { 0, red * 65535U, green * 65535U, blue * 65535U };
+			gtk_widget_modify_bg(widget, GTK_STATE_NORMAL, &color);
+		} else {
+			// TODO Alpha color
+			g_warning("Alpha colors not yet supported (alpha=%f)", alpha);
+		}
+	} else if (topmenu_background_get_pixmap(self, &pixmap)) {
+		GdkDisplay *display = gtk_widget_get_display(widget);
+		GdkPixmap *gpixmap = get_pixmap(display, pixmap);
+
+		if (gpixmap) {
+			if (!gdk_drawable_get_colormap(gpixmap)) {
+				gdk_drawable_set_colormap(GDK_DRAWABLE (gpixmap),
+										  gtk_widget_get_colormap(widget));
+			}
+
+			GtkStyle *style = gtk_style_copy(gtk_widget_get_style(widget));
+			g_clear_object(&style->bg_pixmap[GTK_STATE_NORMAL]);
+			style->bg_pixmap[GTK_STATE_NORMAL] = g_object_ref_sink(gpixmap);
+			gtk_widget_set_style(widget, style);
+			g_object_unref(style);
+		}
+	}
+
+	gtk_widget_queue_draw(widget);
+#endif
+}
+
+void topmenu_background_connect(TopMenuBackground *self, GtkWidget *widget)
+{
+	g_signal_connect(self, "changed",
+	                 G_CALLBACK(topmenu_background_apply), widget);
+}
+
+void topmenu_background_disconnect(TopMenuBackground *self, GtkWidget *widget)
+{
+	g_signal_handlers_disconnect_by_func(self,
+	                                     G_CALLBACK(topmenu_background_apply), widget);
+}
diff --git a/libtopmenu-common/topmenu-background.h b/libtopmenu-common/topmenu-background.h
new file mode 100644
index 0000000..aca72f8
--- /dev/null
+++ b/libtopmenu-common/topmenu-background.h
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2014-2015 Javier S. Pedro <dev.git@javispedro.com>
+ *
+ * This file is part of TopMenu.
+ *
+ * TopMenu is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * TopMenu is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with TopMenu.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _TOPMENU_BACKGROUND_H_
+#define _TOPMENU_BACKGROUND_H_
+
+#include <gtk/gtk.h>
+#include <gdk/gdkx.h>
+
+G_BEGIN_DECLS
+
+#define TOPMENU_TYPE_BACKGROUND           topmenu_background_get_type()
+#define TOPMENU_BACKGROUND(obj)           (G_TYPE_CHECK_INSTANCE_CAST((obj), TOPMENU_TYPE_BACKGROUND, TopMenuBackground))
+#define TOPMENU_IS_BACKGROUND(obj)        (G_TYPE_CHECK_INSTANCE_TYPE((obj), TOPMENU_TYPE_BACKGROUND))
+#define TOPMENU_BACKGROUND_CLASS(c)       (G_TYPE_CHECK_CLASS_CAST((c), TOPMENU_TYPE_BACKGROUND, TopMenuBackgroundClass))
+#define TOPMENU_IS_BACKGROUND_CLASS(c)    (G_TYPE_CHECK_CLASS_TYPE((c), TOPMENU_TYPE_BACKGROUND))
+#define TOPMENU_BACKGROUND_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj), TOPMENU_TYPE_BACKGROUND, TopMenuBackgroundClass))
+
+typedef struct _TopMenuBackground        TopMenuBackground;
+typedef struct _TopMenuBackgroundClass   TopMenuBackgroundClass;
+typedef struct _TopMenuBackgroundPrivate TopMenuBackgroundPrivate;
+
+struct _TopMenuBackground
+{
+	GObject parent_instance;
+	TopMenuBackgroundPrivate *priv;
+};
+
+struct _TopMenuBackgroundClass
+{
+	GObjectClass parent_class;
+};
+
+GType topmenu_background_get_type(void) G_GNUC_CONST;
+
+TopMenuBackground * topmenu_background_new(void);
+
+void topmenu_background_set_from_color(TopMenuBackground *self, double red, double green, double blue, double alpha);
+void topmenu_background_set_from_drawable(TopMenuBackground *self, Drawable drawable);
+void topmenu_background_set_from_cairo_pattern(TopMenuBackground *self, cairo_pattern_t *pattern);
+void topmenu_background_clear(TopMenuBackground *self);
+
+gboolean topmenu_background_get_color(TopMenuBackground *self, double *red, double *green, double *blue, double *alpha);
+gboolean topmenu_background_get_pixmap(TopMenuBackground *self, Pixmap *pixmap);
+
+cairo_pattern_t * topmenu_background_get_cairo_pattern(TopMenuBackground *self);
+
+void topmenu_background_fill_client_message(TopMenuBackground *self, XClientMessageEvent *event);
+void topmenu_background_set_from_client_message(TopMenuBackground *self, XClientMessageEvent *event);
+
+void topmenu_background_apply(TopMenuBackground *self, GtkWidget *widget);
+
+void topmenu_background_connect(TopMenuBackground *self, GtkWidget *widget);
+void topmenu_background_disconnect(TopMenuBackground *self, GtkWidget *widget);
+
+G_END_DECLS
+
+#endif