[PATCH weston 5/5] clients: Add simple draw client for testing pointer devices

[Jonas Ådahl]

Signed-off-by: Jonas Ådahl <jadahl at gmail.com>
---
 clients/Makefile.am |    4 ++
 clients/draw.c      |  197 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 201 insertions(+)
 create mode 100644 clients/draw.c

diff --git a/clients/Makefile.am b/clients/Makefile.am
index 2377189..bb3954b 100644
--- a/clients/Makefile.am
+++ b/clients/Makefile.am
@@ -47,6 +47,7 @@ clients_programs =				\
 	resizor					\
 	eventdemo				\
 	clickdot				\
+	draw					\
 	$(full_gl_client_programs)
 
 desktop_shell = weston-desktop-shell
@@ -93,6 +94,9 @@ eventdemo_LDADD = $(toolkit_libs)
 clickdot_SOURCES = clickdot.c
 clickdot_LDADD = $(toolkit_libs)
 
+draw_SOURCES = draw.c
+draw_LDADD = $(toolkit_libs)
+
 weston_desktop_shell_SOURCES =			\
 	desktop-shell.c				\
 	desktop-shell-client-protocol.h		\
diff --git a/clients/draw.c b/clients/draw.c
new file mode 100644
index 0000000..544b604
--- /dev/null
+++ b/clients/draw.c
@@ -0,0 +1,197 @@
+/*
+ * Copyright © 2012 Jonas Ådahl
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of the copyright holders not be used in
+ * advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission.  The copyright holders make
+ * no representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
+ * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "window.h"
+#include "cairo-util.h"
+
+struct draw {
+	struct window *window;
+	struct widget *widget;
+	struct display *display;
+
+	cairo_surface_t *buffer;
+
+	int width, height;
+	int x, y, old_x, old_y;
+};
+
+static void
+redraw_handler(struct widget *widget, void *data)
+{
+	struct draw *draw = data;
+	struct rectangle allocation;
+	cairo_surface_t *surface;
+	cairo_t *cairo;
+	cairo_t *buffer_context;
+	
+	widget_get_allocation(draw->widget, &allocation);
+
+	surface = window_get_surface(draw->window);
+	cairo = cairo_create(surface);
+	cairo_set_operator(cairo, CAIRO_OPERATOR_SOURCE);
+
+	if (draw->buffer == NULL) {
+		/* Initiate buffer */
+		draw->buffer =
+			cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
+						   allocation.width,
+						   allocation.height);
+		buffer_context = cairo_create(draw->buffer);
+
+		cairo_set_source_rgb(buffer_context, 1, 1, 1);
+		cairo_rectangle(buffer_context,
+				0, 0,
+				allocation.width, allocation.height);
+		cairo_fill(buffer_context);
+	}
+	else
+		buffer_context = cairo_create(draw->buffer);
+
+	/* Paint buffer */
+	cairo_set_source_surface(cairo, draw->buffer,
+				 allocation.x, allocation.y);
+
+	cairo_rectangle(cairo,
+			allocation.x, allocation.y,
+			allocation.width, allocation.height);
+	cairo_clip(cairo);
+	cairo_paint(cairo);
+	cairo_reset_clip(cairo);
+
+	/* Draw line between current pointer position and last */
+	if (draw->x != -1 && draw->y != -1) {
+		if (draw->old_x != -1 && draw->old_y != -1) {
+			cairo_set_line_width(cairo, 2.0);
+			cairo_set_source_rgb(cairo, 0, 0, 0);
+
+			cairo_move_to(cairo, draw->old_x, draw->old_y);
+			cairo_line_to(cairo, draw->x, draw->y);
+			cairo_stroke(cairo);
+		}
+
+		draw->old_x = draw->x;
+		draw->old_y = draw->y;
+	}
+
+	/* Copy new content to buffer */
+	buffer_context = cairo_create(draw->buffer);
+	cairo_set_source_surface(buffer_context, surface,
+				 -allocation.x, -allocation.y);
+	cairo_paint(buffer_context);
+	cairo_destroy(buffer_context);
+
+	cairo_destroy(cairo);
+	cairo_surface_destroy(surface);
+}
+
+static int
+motion_handler(struct widget *widget,
+	       struct input *input, uint32_t time,
+	       GLfloat x, GLfloat y, void *data)
+{
+	struct draw *draw = data;
+	draw->x = x;
+	draw->y = y;
+
+	window_schedule_redraw(draw->window);
+
+	return POINTER_LEFT_PTR;
+}
+
+static void
+keyboard_focus_handler(struct window *window,
+		       struct input *device, void *data)
+{
+	struct draw *draw = data;
+
+	window_schedule_redraw(draw->window);
+}
+
+static struct draw *
+create_draw(struct display *display)
+{
+	struct draw *draw;
+
+	draw = malloc(sizeof *draw);
+	if (draw == NULL)
+		return NULL;
+
+	draw->width = 1000;
+	draw->height = 600;
+	draw->x = -1;
+	draw->y = -1;
+	draw->old_x = -1;
+	draw->old_y = -1;
+
+	draw->display = display;
+	draw->window = window_create(display);
+	draw->widget = frame_create(draw->window, draw);
+	draw->buffer = NULL;
+
+	widget_set_redraw_handler(draw->widget, redraw_handler);
+
+	window_set_title(draw->window, "Wayland Draw");
+	window_set_user_data(draw->window, draw);
+	window_set_keyboard_focus_handler(draw->window,
+					  keyboard_focus_handler);
+
+	widget_set_motion_handler(draw->widget, motion_handler);
+	widget_schedule_resize(draw->widget, draw->width, draw->height);
+
+	return draw;
+}
+
+static void destroy_draw(struct draw *draw)
+{
+	if (draw->buffer)
+		cairo_surface_destroy(draw->buffer);
+	widget_destroy(draw->widget);
+	window_destroy(draw->window);
+	free(draw);
+}
+
+int main(int argc, char *argv[])
+{
+	struct display *display;
+	struct draw *draw;
+
+	display = display_create(argc, argv);
+	if (display == NULL) {
+		fprintf(stderr, "failed to create display; %m\n");
+		return EXIT_FAILURE;
+	}
+
+	draw = create_draw(display);
+	if (draw == NULL) {
+		fprintf(stderr, "failed to create window\n");
+		return EXIT_FAILURE;
+	}
+
+	display_run(display);
+
+	destroy_draw(draw);
+		 
+	return EXIT_SUCCESS;
+}
-- 
1.7.9.5