jpeg,png: Merge user interface code and plugin entry point of the two plugins (part of FS#6321).

* Created new directory, imageviewer/ and moved both jpeg/ and png/ under it.
- this still doesn't merge the two plugins. i.e. both jpeg.rock and png.rock will be made for color targets.
- I'm thinking to merge the two plugins to single image viewer later.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24272 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 51 insertions, 0 deletions

diff --git a/apps/plugins/imageviewer/jpeg/yuv2rgb.h b/apps/plugins/imageviewer/jpeg/yuv2rgb.h
new file mode 100644
index 0000000000..d10a944f38
--- /dev/null
+++ b/apps/plugins/imageviewer/jpeg/yuv2rgb.h
@@ -0,0 +1,51 @@
+/***************************************************************************
+*             __________               __   ___.
+*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+*                     \/            \/     \/    \/            \/
+* $Id$
+*
+* JPEG image viewer
+* (This is a real mess if it has to be coded in one single C file)
+*
+* File scrolling addition (C) 2005 Alexander Spyridakis
+* Copyright (C) 2004 Jörg Hohensohn aka [IDC]Dragon
+* Heavily borrowed from the IJG implementation (C) Thomas G. Lane
+* Small & fast downscaling IDCT (C) 2002 by Guido Vollbeding  JPEGclub.org
+*
+* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+* KIND, either express or implied.
+*
+****************************************************************************/
+
+#ifndef _JPEG_YUV2RGB_H
+#define _JPEG_YUV2RGB_H
+
+enum color_modes
+{
+    COLOURMODE_COLOUR = 0,
+    COLOURMODE_GRAY,
+    COLOUR_NUM_MODES
+};
+
+enum dither_modes
+{
+    DITHER_NONE = 0,    /* No dithering */
+    DITHER_ORDERED,     /* Bayer ordered */
+    DITHER_DIFFUSION,   /* Floyd/Steinberg error diffusion */
+    DITHER_NUM_MODES
+};
+
+void yuv_bitmap_part(unsigned char *src[3], int csub_x, int csub_y,
+                     int src_x, int src_y, int stride,
+                     int x, int y, int width, int height,
+                     int colour_mode, int dither_mode);
+
+#endif