1 files changed, 62 insertions, 0 deletions
diff --git a/src/xine-engine/spu.c b/src/xine-engine/spu.c
new file mode 100644
index 000000000..9bc1de84c
--- /dev/null
+++ b/src/xine-engine/spu.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2007 the xine project
+ *
+ * This file is part of xine, a free video player.
+ *
+ * xine 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.
+ *
+ * xine 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <xine/xine_internal.h>
+#include <xine/spu.h>
+
+#define BLACK_OPACITY   67
+#define COLOUR_OPACITY 100
+
+static void no_op (void *user_data, xine_cfg_entry_t *entry)
+{
+}
+
+void _x_spu_misc_init (xine_t *this)
+{
+  this->config->register_range (this->config, "subtitles.bitmap.black_opacity",
+                                BLACK_OPACITY, 0, 100,
+                                _("opacity for the black parts of bitmapped subtitles"),
+                                NULL,
+                                10, no_op, NULL);
+  this->config->register_range (this->config, "subtitles.bitmap.colour_opacity",
+                                COLOUR_OPACITY, 0, 100,
+                                _("opacity for the colour parts of bitmapped subtitles"),
+                                NULL,
+                                10, no_op, NULL);
+}
+
+void _x_spu_get_opacity (xine_t *this, xine_spu_opacity_t *opacity)
+{
+  cfg_entry_t *entry;
+
+  entry = this->config->lookup_entry (this->config, "subtitles.bitmap.black_opacity");
+  opacity->black = entry ? entry->num_value : BLACK_OPACITY;
+  entry = this->config->lookup_entry (this->config, "subtitles.bitmap.colour_opacity");
+  opacity->colour = entry ? entry->num_value : COLOUR_OPACITY;
+}
+
+int _x_spu_calculate_opacity (const clut_t *clut, uint8_t trans, const xine_spu_opacity_t *opacity)
+{
+  int value = (clut->y == 0 || (clut->y == 16 && clut->cb == 128 && clut->cr == 128))
+	      ? opacity->black
+	      : opacity->colour;
+  return value * (255 - trans) / 100;
+}