Enlightenment CVS committal
Author : raster
Project : web
Module : e
Dir : web/e/pages
Modified Files:
systems.html
Log Message:
more systems docs
===================================================================
RCS file: /cvsroot/enlightenment/web/e/pages/systems.html,v
retrieving revision 1.7
retrieving revision 1.8
diff -u -3 -r1.7 -r1.8
--- systems.html 12 Jul 2004 10:37:51 -0000 1.7
+++ systems.html 13 Jul 2004 07:23:16 -0000 1.8
@@ -128,7 +128,6 @@
<div class="content">
-<p class="contenttitle">THIS PAGE IS BEING WRITTEN - NOT FINISHED!</p>
<p class="contenttitle">Enlightenment's Core Systems</p>
<br>
@@ -306,11 +305,156 @@
danger inherent in ALL systems. The advantage is that the programmer doesn't
need to worry about problems outside of this.
</p><p>
+As an example of what an embryo script would look like, here is a simple
+recursive program with some basic programming constructs and operations:
+</p><p>
+<div class=fragment>
+<pre>
+/* this is exported by the embryo test program so you can output results */
+native printf(format[], ...);
+
+/* in a stand-alone embryo script this is the function that is always called */
+/* first, otherwise it may work like a library where a caller program may */
+/* call specific functions */
+main()
+{
+ new Float:value = randf();
+
+ if (value > 0.5)
+ {
+ new i;
+
+ for (i = 0; i < 20; i++)
+ {
+ printf("value = %f, i = %i\n", value, i);
+ }
+ }
+ else
+ {
+ new val;
+
+ val = recurse(3);
+ printf("val = %i\n", val);
+ }
+}
+
+recurse(val)
+{
+ printf("recurse... val = %i\n", val);
+ if (val >= 10) return val;
+ return recurse(val + 1);
+}
+</pre>
+</div>
+</p><p>
+Embryo provides a full Turing-complete and minimal implementation of the
+Small programming language (compiler and virtual machine). It is not intended
+to be a new programing language to write applications in (like Java, .NET/C#,
+Perl, Python etc.), but to be able to augment the core logic of an existing
+application with scripted code fragments to tie logic together in a
+customisable way.
+</p><p>
<img src=img/sys_eet.png width=318 height=100>
</p><p>
+Eet is a small and very useful library that does 2 things. It acts as a
+miniature "ZIP FILE" library. It doesn't handle ZIP format files as the ZIP
+format is more complex than is needed, but it does a similar thing where it
+can store multiple "files" within 1 compressed archive file AND randomly
+access every "file" within the archive very quickly, and decompress for you.
+This library can create such files and access them very efficiently. It can
+ALSO encode data within such files. It can save image pixel data in various
+formats as well as encode and decode C structs in memory so it is easy to
+store data and retrieve it as all that is needed is to feed in the pointer to
+a C struct in memory to save, and the reverse to load. It makes storage and
+retrieval of data structures in memory becomes an easy process. It can also
+simply serialize this data for transmission across a network too. Eet is a
+big time-saver and is the workhorse underneath Edje for doing the data
+storage it needs.
</p><p>
<img src=img/sys_emotion.png width=318 height=100>
</p><p>
+<a href=img/sys_emotion_shot1.png><img src=img/sys_emotion_shot1_thm.png width=256
height=205 class=sshot align=left alt="Emotion Test program" hspace=16 vspace=16
border=0></a>
+</p><p>
+Emotion is the one of the newest libraries, but it shows the strength of what
+it is built on by its rapid development. Emotion is a video & media object
+library designed to interface with Evas and Ecore to provide autonomous
+"video" and "audio" objects that can be moved, resized and positioned like any
+normal object, but instead they can play video and audio and can be
+controlled from a high-level control API allowing the programmer to quickly
+piece together a multi-media system with minimal work. Emotion provides a
+modular decoder layer system where a decoder module can be plugged in
+separately to provide decoding resources for Emotion. Emotion currently has 1
+decoder module that uses <a href=http://www.xinehq.de>XINE</a> as the
+decoder, allowing it to play DVD's, MPEG's, AVI's, MOV's, WMV's and much
+more. Its test program is already a useful DVD player (without a lot of the
+fancy control interface) and can play multiple video streams with
+semi-translucency and more.
+</p><p>
+To show how easy Emotion makes it to put a video file, DVD, VCD or other
+media content within a canvas take a look at the following program. It is a
+complete DVD player (very simple with limited mouse controls over the DVD
+menus, no handling of aspect ratio change etc, but it works). This is all of
+56 lines of C code.
+</p><p>
+<div class=fragment>
+<pre>
+#include <Evas.h>
+#include <Ecore.h>
+#include <Ecore_Evas.h>
+#include <Emotion.h>
+
+Evas_Object *video;
+
+/* if the window manager requests a delete - quit cleanly */
+static void
+canvas_delete_request(Ecore_Evas *ee)
+{
+ ecore_main_loop_quit();
+}
+
+/* if the canvas is resized - resize the video too */
+static void
+canvas_resize(Ecore_Evas *ee)
+{
+ Evas_Coord w, h;
+
+ evas_output_viewport_get(ecore_evas_get(ee), NULL, NULL, &w, &h);
+ evas_object_move(video, 0, 0);
+ evas_object_resize(video, w, h);
+}
+
+/* the main function of the program */
+int main(int argc, char **argv)
+{
+ Ecore_Evas *ee;
+
+ /* create a canvas, display it, set a title, callbacks to call on resize */
+ /* or if the window manager asks it to be deleted */
+ ecore_evas_init();
+ ee = ecore_evas_software_x11_new(NULL, 0, 0, 0, 800, 600);
+ ecore_evas_callback_delete_request_set(ee, canvas_delete_request);
+ ecore_evas_callback_resize_set(ee, canvas_resize);
+ ecore_evas_title_set(ee, "My DVD Player");
+ ecore_evas_name_class_set(ee, "my_dvd_player", "My_DVD_Player");
+ ecore_evas_show(ee);
+
+ /* create a video object */
+ video = emotion_object_add(ecore_evas_get(ee));
+ emotion_object_file_set(video, "dvd:/");
+ emotion_object_play_set(video, 1);
+ evas_object_show(video);
+
+ /* force an initial resize */
+ canvas_resize(ee);
+
+ /* run the main loop of the program - playing, drawing, handling events */
+ ecore_main_loop_begin();
+
+ /* if we exit the main loop we will shut down */
+ ecore_evas_shutdown();
+}
+</pre>
+</div>
</p><p>
</p>
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