Add core JPEG reader, adapted from the JPEG plugin's decoder, with some changes to prevent include conflicts between the two decoders.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20836 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 89 insertions, 0 deletions

diff --git a/apps/plugins/test_core_jpeg.c b/apps/plugins/test_core_jpeg.c
new file mode 100644
index 0000000..5df69b5
--- /dev/null
+++ b/apps/plugins/test_core_jpeg.c
@@ -0,0 +1,89 @@
+/*****************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _// __ \_/ ___\|  |/ /| __ \ / __ \  \/  /
+ *   Jukebox    |    |   ( (__) )  \___|    ( | \_\ ( (__) )    (
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2008 Andrew Mahone
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+#include "plugin.h"
+#include "lib/grey.h"
+PLUGIN_HEADER
+
+/* different graphics libraries */
+#if LCD_DEPTH < 8
+#define USEGSLIB
+GREY_INFO_STRUCT
+#define MYLCD(fn) grey_ub_ ## fn
+#define MYLCD_UPDATE()
+#define MYXLCD(fn) grey_ub_ ## fn
+#define CFORMAT &format_grey
+#else
+#define MYLCD(fn) rb->lcd_ ## fn
+#define MYLCD_UPDATE() rb->lcd_update();
+#define MYXLCD(fn) xlcd_ ## fn
+#define CFORMAT NULL
+#endif
+
+/* this is the plugin entry point */
+enum plugin_status plugin_start(const void* parameter)
+{
+    size_t plugin_buf_len;
+    unsigned char * plugin_buf =
+        (unsigned char *)rb->plugin_get_buffer(&plugin_buf_len);
+    static char filename[MAX_PATH];
+    struct bitmap bm = {
+        .width = LCD_WIDTH,
+        .height = LCD_HEIGHT,
+    };
+    int ret;
+
+    if(!parameter) return PLUGIN_ERROR;
+
+    rb->strcpy(filename, parameter);
+
+#ifdef USEGSLIB
+    long greysize;
+    if (!grey_init(plugin_buf, plugin_buf_len, GREY_ON_COP,
+                   LCD_WIDTH, LCD_HEIGHT, &greysize))
+    {
+        rb->splash(HZ, "grey buf error");
+        return PLUGIN_ERROR;
+    }
+    plugin_buf += greysize;
+    plugin_buf_len -= greysize;
+#endif
+    bm.data = plugin_buf;
+    ret = rb->read_jpeg_file(filename, &bm, plugin_buf_len,
+                   FORMAT_NATIVE|FORMAT_RESIZE|FORMAT_KEEP_ASPECT,
+                   CFORMAT);
+    if (ret < 1)
+        return PLUGIN_ERROR;
+#ifdef USEGSLIB
+    grey_show(true);
+    grey_ub_gray_bitmap((fb_data *)bm.data, (LCD_WIDTH - bm.width) >> 1,
+        (LCD_HEIGHT - bm.height) >> 1, bm.width, bm.height);
+#else
+    rb->lcd_bitmap((fb_data *)bm.data, (LCD_WIDTH - bm.width) >> 1,
+        (LCD_HEIGHT - bm.height) >> 1, bm.width, bm.height);
+#endif
+    MYLCD_UPDATE();
+    while (rb->get_action(CONTEXT_STD,1) != ACTION_STD_OK) rb->yield();
+#ifdef USEGSLIB
+    grey_release();
+#endif
+    return PLUGIN_OK;
+}