cogl-gst: Add some documentation

Adds documentation comments to CoglGstVideoSink and makes it generate
a separate manual to contain it.

One thing that I wasn't able to figure out with this was how to get
the documentation to have correct references to the main Cogl docs.
You can pass arguments to gtkdoc-fixxref to point to other manuals,
but presumably this needs the installed locations and when the
Cogl-Gst documentation is generated the Cogl docs may not have been
installed yet.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit 5acdf8db47311893a9cf9ea04a66a287b657b8b0)

5 files changed, 245 insertions, 0 deletions

diff --git a/doc/reference/Makefile.am b/doc/reference/Makefile.am
index 8cf6d059..20a45bdf 100644
--- a/doc/reference/Makefile.am
+++ b/doc/reference/Makefile.am
@@ -1 +1,5 @@
 SUBDIRS = cogl cogl-2.0-experimental
+
+if BUILD_COGL_GST
+SUBDIRS += cogl-gst
+endif
diff --git a/doc/reference/cogl-gst/Makefile.am b/doc/reference/cogl-gst/Makefile.am
new file mode 100644
index 00000000..80f07b94
--- /dev/null
+++ b/doc/reference/cogl-gst/Makefile.am
@@ -0,0 +1,106 @@
+## Process this file with automake to produce Makefile.in
+
+# We require automake 1.6 at least.
+AUTOMAKE_OPTIONS = 1.6
+
+# This is a blank Makefile.am for using gtk-doc.
+# Copy this to your project's API docs directory and modify the variables to
+# suit your project. See the GTK+ Makefiles in gtk+/docs/reference for examples
+# of using the various options.
+
+# The name of the module, e.g. 'glib'.
+DOC_MODULE=cogl-gst
+
+# The top-level SGML file. You can change this if you want to.
+DOC_MAIN_SGML_FILE=$(DOC_MODULE)-docs.xml
+
+# The directory containing the source code. Relative to $(srcdir).
+# gtk-doc will search all .c & .h files beneath here for inline comments
+# documenting the functions and macros.
+# e.g. DOC_SOURCE_DIR=../../../gtk
+DOC_SOURCE_DIR=../../../cogl-gst
+
+# Extra options to pass to gtkdoc-scangobj. Not normally needed.
+SCANGOBJ_OPTIONS=--type-init-func="gst_init(NULL, NULL)"
+
+# Extra options to supply to gtkdoc-scan.
+# e.g. SCAN_OPTIONS=--deprecated-guards="GTK_DISABLE_DEPRECATED"
+SCAN_OPTIONS=--deprecated-guards="COGL_DISABLE_DEPRECATED"
+
+# Extra options to supply to gtkdoc-mkdb.
+# e.g. MKDB_OPTIONS=--sgml-mode --output-format=xml
+MKDB_OPTIONS=--sgml-mode --output-format=xml --name-space=cogl_gst
+
+# Extra options to supply to gtkdoc-mktmpl
+# e.g. MKTMPL_OPTIONS=--only-section-tmpl
+MKTMPL_OPTIONS=
+
+# Extra options to supply to gtkdoc-fixref. Not normally needed.
+# e.g. FIXXREF_OPTIONS=--extra-dir=../gdk-pixbuf/html --extra-dir=../gdk/html
+FIXXREF_OPTIONS=\
+	--extra-dir=$(GLIB_PREFIX)/share/gtk-doc/html/glib \
+	--extra-dir=$(GDKPIXBUF_PREFIX)/share/gtk-doc/html/gdk-pixbuf \
+	--extra-dir=$(GSTREAMER_PREFIX)/share/gtk-doc/html/gstreamer-1.0 \
+	--extra-dir=$(GSTREAMER_PREFIX)/share/gtk-doc/html/gstreamer-libs-1.0
+
+# Used for dependencies. The docs will be rebuilt if any of these change.
+# e.g. HFILE_GLOB=$(top_srcdir)/gtk/*.h
+# e.g. CFILE_GLOB=$(top_srcdir)/gtk/*.c
+HFILE_GLOB=\
+	$(top_srcdir)/cogl/*.h \
+	$(top_builddir)/cogl/*.h \
+	$(top_srcdir)/cogl/winsys/*.h \
+	$(top_srcdir)/cogl-gst/*.h
+CFILE_GLOB=$(top_srcdir)/cogl-gst/*.c
+
+IGNORE_HFILES=\
+	$(NULL)
+
+EXTRA_HFILES=
+
+# Images to copy into HTML directory.
+# e.g. HTML_IMAGES=$(top_srcdir)/gtk/stock-icons/stock_about_24.png
+HTML_IMAGES=\
+	$(NULL)
+
+# Extra SGML files that are included by $(DOC_MAIN_SGML_FILE).
+# e.g. content_files=running.sgml building.sgml changes-2.0.sgml
+content_files=\
+	$(NULL)
+
+# SGML files where gtk-doc abbrevations (#GtkWidget) are expanded
+# These files must be listed here *and* in content_files
+# e.g. expand_content_files=running.sgml
+expand_content_files=\
+	$(NULL)
+
+# CFLAGS and LDFLAGS for compiling gtkdoc-scangobj with your library.
+# Only needed if you are using gtkdoc-scangobj to dynamically query widget
+# signals and properties.
+# e.g. AM_CPPFLAGS=-I$(top_srcdir) -I$(top_builddir) $(GTK_DEBUG_FLAGS)
+# e.g. GTKDOC_LIBS=$(top_builddir)/gtk/$(gtktargetlib)
+
+AM_CPPFLAGS=\
+	-I$(top_srcdir) \
+	-I$(top_builddir)/cogl \
+	-DCOGL_ENABLE_EXPERIMENTAL_API \
+	$(COGL_DEP_CFLAGS) \
+	$(COGL_GST_DEP_CFLAGS)
+
+GTKDOC_LIBS=\
+	$(top_builddir)/cogl/libcogl2.la \
+	$(top_builddir)/cogl-gst/libcogl-gst.la \
+	$(COGL_DEP_LIBS) \
+	$(COGL_GST_DEP_LIBS)
+
+# This includes the standard gtk-doc make rules, copied by gtkdocize.
+if BUILD_GTK_DOC
+include $(top_srcdir)/gtk-doc.make
+else
+EXTRA_DIST =
+endif
+
+# Other files to distribute
+# e.g. EXTRA_DIST += version.xml.in
+
+EXTRA_DIST += $(HTML_IMAGES) $(content_files)
diff --git a/doc/reference/cogl-gst/cogl-gst-docs.xml.in b/doc/reference/cogl-gst/cogl-gst-docs.xml.in
new file mode 100644
index 00000000..8bf4fb6f
--- /dev/null
+++ b/doc/reference/cogl-gst/cogl-gst-docs.xml.in
@@ -0,0 +1,105 @@
+<?xml version="1.0"?>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
+               "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" [
+<!ENTITY version "@VERSION@">
+]>
+<book id="index" xmlns:xi="http://www.w3.org/2003/XInclude">
+
+  <bookinfo>
+    <title>Cogl GST 2.0 Reference Manual</title>
+    <releaseinfo>for Cogl &version;</releaseinfo>
+
+    <copyright>
+      <year>2013</year>
+      <holder>Intel Corporation</holder>
+    </copyright>
+
+    <legalnotice>
+      <para>
+        Permission is granted to copy, distribute and/or modify this
+        document under the terms of the <citetitle>GNU Free
+        Documentation License</citetitle>, Version 1.1 or any later
+        version published by the Free Software Foundation with no
+        Invariant Sections, no Front-Cover Texts, and no Back-Cover
+        Texts. You may obtain a copy of the <citetitle>GNU Free
+        Documentation License</citetitle> from the Free Software
+        Foundation by visiting <ulink type="http"
+        url="http://www.fsf.org">their Web site</ulink> or by writing
+        to:
+
+        <address>
+          The Free Software Foundation, Inc.,
+          <street>59 Temple Place</street> - Suite 330,
+          <city>Boston</city>, <state>MA</state> <postcode>02111-1307</postcode>,
+          <country>USA</country>
+        </address>
+      </para>
+    </legalnotice>
+
+  </bookinfo>
+
+  <chapter>
+    <title>Cogl GST - a library for integrating GStreamer with Cogl</title>
+
+    <section id="cogl-gst-intro">
+      <title>About Cogl GST</title>
+
+      <para>Cogl GST is a small library which provides a GStreamer
+      sink which can manage a CoglPipeline to render a video within a
+      Cogl scene.</para>
+
+    </section>
+
+    <section id="cogl-gst-general-apis">
+      <title>General APIs</title>
+      <xi:include href="xml/cogl-gst-video-sink.xml"/>
+    </section>
+
+  </chapter>
+
+  <chapter id="coglglossary">
+    <title>Glossaries</title>
+
+    <xi:include href="xml/annotation-glossary.xml"><xi:fallback /></xi:include>
+  </chapter>
+
+  <index>
+    <title>Index of all symbols</title>
+    <xi:include href="xml/api-index-full.xml"><xi:fallback /></xi:include>
+  </index>
+
+  <appendix id="license">
+    <title>License</title>
+
+    <para>
+      This library is free software; you can redistribute it and/or
+      modify it under the terms of the <citetitle>GNU Library General
+      Public License</citetitle> as published by the Free Software
+      Foundation; either version 2 of the License, or (at your option)
+      any later version.
+    </para>
+
+    <para>
+      This library 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
+      <citetitle>GNU Library General Public License</citetitle> for
+      more details.
+    </para>
+
+    <para>
+      You may obtain a copy of the <citetitle>GNU Library General
+      Public License</citetitle> from the Free Software Foundation by
+      visiting <ulink type="http" url="http://www.fsf.org">their Web
+      site</ulink> or by writing to:
+
+      <address>
+        Free Software Foundation, Inc.
+        <street>59 Temple Place</street> - Suite 330
+        <city>Boston</city>, <state>MA</state> <postcode>02111-1307</postcode>
+        <country>USA</country>
+      </address>
+    </para>
+  </appendix>
+
+</book>
diff --git a/doc/reference/cogl-gst/cogl-gst-sections.txt b/doc/reference/cogl-gst/cogl-gst-sections.txt
new file mode 100644
index 00000000..ea0e761e
--- /dev/null
+++ b/doc/reference/cogl-gst/cogl-gst-sections.txt
@@ -0,0 +1,28 @@
+<SECTION>
+<FILE>cogl-gst-video-sink</FILE>
+<TITLE>CoglGstVideoSink</TITLE>
+
+<SUBSECTION>
+CoglGstVideoSink
+CoglGstVideoSinkClass
+cogl_gst_video_sink_new
+cogl_gst_video_sink_set_context
+cogl_gst_video_sink_get_pipeline
+cogl_gst_video_sink_attach_frame
+cogl_gst_video_sink_setup_pipeline
+cogl_gst_video_sink_get_free_layer
+cogl_gst_video_sink_set_first_layer
+cogl_gst_video_sink_set_default_sample
+
+<SUBSECTION Standard>
+COGL_GST_IS_VIDEO_SINK
+COGL_GST_IS_VIDEO_SINK_CLASS
+COGL_GST_VIDEO_SINK
+COGL_GST_VIDEO_SINK_CLASS
+COGL_GST_TYPE_VIDEO_SINK
+COGL_GST_VIDEO_SINK_GET_CLASS
+<SUBSECTION Private>
+CoglGstVideoSinkPrivate
+cogl_gst_video_sink_get_type
+
+</SECTION>
diff --git a/doc/reference/cogl-gst/cogl-gst.types b/doc/reference/cogl-gst/cogl-gst.types
new file mode 100644
index 00000000..4d6f953e
--- /dev/null
+++ b/doc/reference/cogl-gst/cogl-gst.types
@@ -0,0 +1,2 @@
+#include <cogl-gst/cogl-gst.h>
+cogl_gst_video_sink_get_type