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-rw-r--r--plugins/wacom/gsd-wacom-oled.c258
1 files changed, 258 insertions, 0 deletions
diff --git a/plugins/wacom/gsd-wacom-oled.c b/plugins/wacom/gsd-wacom-oled.c
new file mode 100644
index 0000000..4c2daf1
--- /dev/null
+++ b/plugins/wacom/gsd-wacom-oled.c
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+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2013 Przemo Firszt <przemo@firszt.eu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "config.h"
+
+#include <unistd.h>
+#include <math.h>
+#include <pango/pango.h>
+#include <pango/pangocairo.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "gsd-wacom-oled.h"
+
+#define MAGIC_BASE64 "base64:" /*Label starting with base64: is treated as already encoded*/
+#define MAGIC_BASE64_LEN strlen(MAGIC_BASE64)
+
+static void
+oled_surface_to_image (guchar *image,
+ cairo_surface_t *surface)
+{
+ unsigned char *csurf;
+ int i, x, y;
+ unsigned char lo, hi;
+
+ cairo_surface_flush (surface);
+ csurf = cairo_image_surface_get_data (surface);
+ i = 0;
+ for (y = 0; y < OLED_HEIGHT; y++) {
+ for (x = 0; x < (OLED_WIDTH / 2); x++) {
+ hi = 0xf0 & csurf[4 * OLED_WIDTH * y + 8 * x + 1];
+ lo = 0x0f & (csurf[4 * OLED_WIDTH * y + 8 * x + 5] >> 4);
+ image[i] = hi | lo;
+ i++;
+ }
+ }
+}
+
+static void
+oled_split_text (char *label,
+ char *line1,
+ char *line2)
+{
+ char delimiters[5] = "+-_ ";
+ char **token;
+ int token_len[MAX_TOKEN];
+ gsize length;
+ int i;
+
+ if (g_utf8_strlen (label, LABEL_SIZE) <= MAX_1ST_LINE_LEN) {
+ g_utf8_strncpy (line1, label, MAX_1ST_LINE_LEN);
+ return;
+ }
+
+ token = g_strsplit_set (label, delimiters, -1);
+
+ if (g_utf8_strlen (token[0], LABEL_SIZE) > MAX_1ST_LINE_LEN) {
+ g_utf8_strncpy (line1, label, MAX_1ST_LINE_LEN);
+ g_utf8_strncpy (line2, label + MAX_1ST_LINE_LEN, LABEL_SIZE - MAX_1ST_LINE_LEN);
+ return;
+ }
+
+ for (i = 0; token[i] != NULL; i++)
+ token_len[i] = g_utf8_strlen (token[i], LABEL_SIZE);
+
+ length = token_len[0];
+ i = 0;
+ while ((length + token_len[i + 1] + 1) <= MAX_1ST_LINE_LEN) {
+ i++;
+ length = length + token_len[i] + 1;
+ }
+
+ g_utf8_strncpy (line1, label, length);
+ g_utf8_strncpy (line2, label + length + 1, LABEL_SIZE - length);
+
+ return;
+}
+
+static void
+oled_render_text (char *label,
+ guchar *image,
+ gboolean left_handed)
+{
+ cairo_t *cr;
+ cairo_surface_t *surface;
+ PangoFontDescription *desc;
+ PangoLayout *layout;
+ int width, height;
+ double dx, dy;
+ char line1[LABEL_SIZE + 1] = "";
+ char line2[LABEL_SIZE + 1] = "";
+ char *buf;
+
+ oled_split_text (label ,line1, line2);
+
+ buf = g_strdup_printf ("%s\n%s", line1, line2);
+
+ surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, OLED_WIDTH, OLED_HEIGHT);
+ cr = cairo_create (surface);
+
+ /* Rotate text so it's seen correctly on the device, or at
+ * least from top to bottom for LTR text in vertical modes.
+ */
+ if (left_handed) {
+ cairo_translate (cr, OLED_WIDTH, OLED_HEIGHT);
+ cairo_scale (cr, -1, -1);
+ }
+
+ cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.99);
+ cairo_paint (cr);
+
+ layout = pango_cairo_create_layout (cr);
+ pango_layout_set_alignment (layout, PANGO_ALIGN_CENTER);
+ pango_layout_set_text (layout, buf, - 1);
+ g_free (buf);
+ desc = pango_font_description_new ();
+
+ pango_font_description_set_family (desc, "Terminal");
+ pango_font_description_set_absolute_size (desc, PANGO_SCALE * 11);
+ pango_layout_set_font_description (layout, desc);
+ pango_font_description_free (desc);
+ pango_layout_get_size (layout, &width, &height);
+ width = width/PANGO_SCALE;
+ cairo_new_path (cr);
+
+ dx = trunc (((double)OLED_WIDTH - width) / 2);
+
+ if (*line2 == '\0')
+ dy = 10;
+ else
+ dy = 4;
+
+ cairo_move_to (cr, dx, dy);
+ cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 1.0);
+ pango_cairo_update_layout (cr, layout);
+
+ pango_cairo_layout_path (cr, layout);
+ cairo_fill (cr);
+
+ oled_surface_to_image (image, surface);
+
+ g_object_unref (layout);
+ cairo_destroy (cr);
+
+ cairo_surface_destroy (surface);
+}
+
+char *
+gsd_wacom_oled_gdkpixbuf_to_base64 (GdkPixbuf *pixbuf)
+{
+ int i, x, y, ch, rs;
+ guchar *pix, *p;
+ guchar *image;
+ guchar lo, hi;
+ char *base_string, *base64;
+
+ if (OLED_WIDTH != gdk_pixbuf_get_width (pixbuf))
+ return NULL;
+
+ if (OLED_HEIGHT != gdk_pixbuf_get_height (pixbuf))
+ return NULL;
+
+ ch = gdk_pixbuf_get_n_channels (pixbuf);
+ rs = gdk_pixbuf_get_rowstride (pixbuf);
+ pix = gdk_pixbuf_get_pixels (pixbuf);
+
+ image = g_malloc (MAX_IMAGE_SIZE);
+ i = 0;
+ for (y = 0; y < OLED_HEIGHT; y++) {
+ for (x = 0; x < (OLED_WIDTH / 2); x++) {
+ p = pix + y * rs + 2 * x * ch;
+ hi = 0xf0 & ((p[0] + p[1] + p[2])/ 3 * p[3] / 0xff);
+ p = pix + y * rs + ((2 * x) + 1) * ch;
+ lo = 0x0f & (((p[0] + p[1] + p[2])/ 3 * p[3] / 0xff) >> 4);
+ image[i] = hi | lo;
+ i++;
+ }
+ }
+
+ base_string = g_base64_encode (image, MAX_IMAGE_SIZE);
+ base64 = g_strconcat (MAGIC_BASE64, base_string, NULL);
+ g_free (base_string);
+ g_free (image);
+
+ return base64;
+}
+
+static char *
+oled_encode_image (char *label,
+ gboolean left_handed)
+{
+ unsigned char *image;
+
+ image = g_malloc (MAX_IMAGE_SIZE);
+
+ /* convert label to image */
+ oled_render_text (label, image, left_handed);
+
+ return (g_base64_encode (image, MAX_IMAGE_SIZE));
+}
+
+gboolean
+set_oled (const gchar *device_path,
+ gboolean left_handed,
+ guint button,
+ char *label,
+ GError **error)
+{
+ char *command;
+ gboolean ret;
+ char *buffer;
+ gint status;
+
+#ifndef HAVE_GUDEV
+ /* Not implemented on non-Linux systems */
+ return TRUE;
+#endif
+
+ if (g_str_has_prefix (label, MAGIC_BASE64)) {
+ buffer = g_strdup (label + MAGIC_BASE64_LEN);
+ } else {
+ buffer = oled_encode_image (label, left_handed);
+ }
+
+ g_debug ("Setting OLED label '%s' on button %d (device %s)", label, button, device_path);
+
+ command = g_strdup_printf ("pkexec " LIBEXECDIR "/gsd-wacom-oled-helper --path %s --button %d --buffer %s",
+ device_path, button, buffer);
+ ret = g_spawn_command_line_sync (command,
+ NULL,
+ NULL,
+ &status,
+ error);
+
+ if (ret == TRUE && status != 0)
+ ret = FALSE;
+
+ g_free (command);
+
+ return ret;
+}
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