[PATCH weston 12/16] tablet: Add demo application for tablets
Bastian Farkas
bfarkas at de.adit-jv.com
Wed Oct 25 11:16:25 UTC 2017
From: Lyude Paul <thatslyude at gmail.com>
Note that this application does not follow best practices for handling tablet
events. The events are grouped by frame, all processing should be done in the
frame instead of the respective handler.
A good toolkit would accumulate the data in the events and provide them as one
event to the actual client once the frame is received. toytoolkit just hooks
up the handler one-by-one, so we're doing this here as well.
Co-authored-by: Peter Hutterer <peter.hutterer at who-t.net>
Signed-off-by: Lyude Paul <thatslyude at gmail.com>
Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
Signed-off-by: Bastian Farkas <bfarkas at de.adit-jv.com>
---
.gitignore | 1 +
Makefile.am | 7 +-
clients/tablet.c | 254 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 261 insertions(+), 1 deletion(-)
create mode 100644 clients/tablet.c
diff --git a/.gitignore b/.gitignore
index ac76fd9..359743c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -76,6 +76,7 @@ weston-simple-damage
weston-smoke
weston-stacking
weston-subsurfaces
+weston-tablet
weston-transformed
weston-view
diff --git a/Makefile.am b/Makefile.am
index 88739f8..dd5d133 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -558,7 +558,8 @@ demo_clients += \
weston-simple-damage \
weston-simple-touch \
weston-presentation-shm \
- weston-multi-resource
+ weston-multi-resource \
+ weston-tablet
weston_simple_shm_SOURCES = clients/simple-shm.c
nodist_weston_simple_shm_SOURCES = \
@@ -724,6 +725,10 @@ weston_scaler_SOURCES = clients/scaler.c
weston_scaler_LDADD = libtoytoolkit.la
weston_scaler_CFLAGS = $(AM_CFLAGS) $(CLIENT_CFLAGS)
+weston_tablet_SOURCES = clients/tablet.c
+weston_tablet_LDADD = libtoytoolkit.la
+weston_tablet_CFLAGS = $(AM_CFLAGS) $(CLIENT_CFLAGS)
+
if HAVE_CAIRO_GLESV2
demo_clients += weston-nested weston-nested-client
diff --git a/clients/tablet.c b/clients/tablet.c
new file mode 100644
index 0000000..e6d314d
--- /dev/null
+++ b/clients/tablet.c
@@ -0,0 +1,254 @@
+/*
+ * Copyright © 2014 Lyude
+ *
+ * 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 "config.h"
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <cairo.h>
+#include <math.h>
+#include <assert.h>
+#include <stdbool.h>
+
+#include <linux/input.h>
+#include <wayland-client.h>
+
+#include "window.h"
+#include "tablet-unstable-v1-client-protocol.h"
+
+struct display *display;
+struct window *window;
+struct widget *widget;
+
+cairo_surface_t *draw_buffer;
+
+int old_x, old_y;
+int current_x, current_y;
+enum zwp_tablet_tool_v1_type tool_type;
+
+bool tablet_is_down;
+
+double current_pressure;
+
+#define WL_TABLET_AXIS_MAX 65535
+
+static void
+redraw_handler(struct widget *widget, void *data)
+{
+ cairo_surface_t *surface;
+ cairo_t *window_cr, *drawing_cr;
+ struct rectangle allocation;
+
+ widget_get_allocation(widget, &allocation);
+
+ surface = window_get_surface(window);
+
+ /* Setup the background */
+ window_cr = cairo_create(surface);
+ cairo_set_operator(window_cr, CAIRO_OPERATOR_SOURCE);
+ cairo_rectangle(window_cr,
+ allocation.x,
+ allocation.y,
+ allocation.width,
+ allocation.height);
+ cairo_set_source_rgba(window_cr, 0, 0, 0, 0.8);
+ cairo_fill(window_cr);
+
+ /* Update the drawing buffer */
+ if (tablet_is_down) {
+ if (old_x != -1 && old_y != -1) {
+ drawing_cr = cairo_create(draw_buffer);
+ if (tool_type == ZWP_TABLET_TOOL_V1_TYPE_PEN) {
+ cairo_set_source_rgb(drawing_cr, 1, 1, 1);
+ cairo_set_line_width(drawing_cr,
+ current_pressure /
+ WL_TABLET_AXIS_MAX * 7 + 1);
+ } else if (tool_type == ZWP_TABLET_TOOL_V1_TYPE_ERASER) {
+ cairo_set_operator(drawing_cr, CAIRO_OPERATOR_CLEAR);
+ cairo_set_source_rgb(drawing_cr, 0, 0, 0);
+ cairo_set_line_width(drawing_cr,
+ current_pressure /
+ WL_TABLET_AXIS_MAX * 30 + 10);
+ }
+
+ cairo_set_line_cap(drawing_cr, CAIRO_LINE_CAP_ROUND);
+
+ cairo_translate(drawing_cr,
+ -allocation.x,
+ -allocation.y);
+ cairo_move_to(drawing_cr, old_x, old_y);
+ cairo_line_to(drawing_cr, current_x, current_y);
+ cairo_stroke(drawing_cr);
+
+ cairo_destroy(drawing_cr);
+ }
+
+ old_x = current_x;
+ old_y = current_y;
+ }
+
+ /* Squash the drawing buffer onto the window's buffer */
+ cairo_set_source_surface(window_cr,
+ draw_buffer,
+ allocation.x,
+ allocation.y);
+ cairo_set_operator(window_cr, CAIRO_OPERATOR_ADD);
+ cairo_rectangle(window_cr,
+ allocation.x,
+ allocation.y,
+ allocation.width,
+ allocation.height);
+ cairo_clip(window_cr);
+ cairo_paint(window_cr);
+
+ cairo_destroy(window_cr);
+
+ cairo_surface_destroy(surface);
+}
+
+static void
+resize_handler(struct widget *widget,
+ int32_t width, int32_t height,
+ void *data)
+{
+ cairo_surface_t *tmp_buffer;
+ cairo_t *cr;
+
+ tmp_buffer = draw_buffer;
+ draw_buffer = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
+ width, height);
+ cr = cairo_create(draw_buffer);
+ cairo_set_source_rgba(cr, 0, 0, 0, 0);
+ cairo_rectangle(cr, 0, 0, width, height);
+ cairo_fill(cr);
+
+ if (tmp_buffer) {
+ cairo_set_source_surface(cr, tmp_buffer, 0, 0);
+ cairo_rectangle(cr, 0, 0, width, height);
+ cairo_clip(cr);
+ cairo_paint(cr);
+ }
+
+ cairo_destroy(cr);
+
+ cairo_surface_destroy(tmp_buffer);
+}
+
+static void
+proximity_in_handler(struct widget *widget, struct tablet_tool *tool,
+ struct tablet *tablet, void *data)
+{
+ tool_type = tablet_tool_get_type(tool);
+}
+
+static void
+pressure_handler(struct widget *widget, struct tablet_tool *tool,
+ uint32_t pressure, void *data)
+{
+ current_pressure = pressure;
+}
+
+static int
+tablet_motion_handler(struct widget *widget, struct tablet_tool *tool,
+ float x, float y, void *data)
+{
+ int cursor;
+
+ current_x = x;
+ current_y = y;
+
+ if (tablet_is_down) {
+ widget_schedule_redraw(widget);
+ cursor = CURSOR_HAND1;
+ } else {
+ cursor = CURSOR_LEFT_PTR;
+ }
+
+ return cursor;
+}
+
+static void
+tablet_down_handler(struct widget *widget, struct tablet_tool *tool, void *data)
+{
+ tablet_is_down = true;
+}
+
+static void
+tablet_up_handler(struct widget *widget, struct tablet_tool *tool, void *data)
+{
+ tablet_is_down = false;
+ old_x = -1;
+ old_y = -1;
+}
+
+static void
+init_globals(void)
+{
+ window = window_create(display);
+ widget = window_frame_create(window, NULL);
+ window_set_title(window, "Wayland Tablet Demo");
+ old_x = -1;
+ old_y = -1;
+
+ widget_set_tablet_tool_axis_handlers(widget,
+ tablet_motion_handler,
+ pressure_handler,
+ NULL, NULL,
+ NULL, NULL, NULL);
+ widget_set_tablet_tool_down_handler(widget, tablet_down_handler);
+ widget_set_tablet_tool_up_handler(widget, tablet_up_handler);
+ widget_set_tablet_tool_proximity_handlers(widget,
+ proximity_in_handler,
+ NULL);
+ widget_set_redraw_handler(widget, redraw_handler);
+ widget_set_resize_handler(widget, resize_handler);
+
+ widget_schedule_resize(widget, 1000, 800);
+}
+
+static void
+cleanup(void)
+{
+ widget_destroy(widget);
+ window_destroy(window);
+}
+
+int
+main(int argc, char *argv[])
+{
+ display = display_create(&argc, argv);
+ if (display == NULL) {
+ fprintf(stderr, "failed to create display: %m\n");
+ return -1;
+ }
+
+ init_globals();
+
+ display_run(display);
+
+ cleanup();
+
+ display_destroy(display);
+
+ return 0;
+}
--
2.7.4
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