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

3 files changed, 93 insertions, 67 deletions

diff --git a/apps/plugins/jpeg/jpeg_decoder.h b/apps/plugins/jpeg/jpeg_decoder.h
index f4dbeaa147..b86bdaf001 100644
--- a/apps/plugins/jpeg/jpeg_decoder.h
+++ b/apps/plugins/jpeg/jpeg_decoder.h
@@ -27,62 +27,7 @@
 
 #ifndef _JPEG_JPEG_DECODER_H
 #define _JPEG_JPEG_DECODER_H
-
-#define HUFF_LOOKAHEAD 8 /* # of bits of lookahead */
-
-struct derived_tbl
-{
-    /* Basic tables: (element [0] of each array is unused) */
-    long mincode[17]; /* smallest code of length k */
-    long maxcode[18]; /* largest code of length k (-1 if none) */
-    /* (maxcode[17] is a sentinel to ensure huff_DECODE terminates) */
-    int valptr[17]; /* huffval[] index of 1st symbol of length k */
-
-    /* Back link to public Huffman table (needed only in slow_DECODE) */
-    int* pub;
-
-    /* Lookahead tables: indexed by the next HUFF_LOOKAHEAD bits of
-    the input data stream.  If the next Huffman code is no more
-    than HUFF_LOOKAHEAD bits long, we can obtain its length and
-    the corresponding symbol directly from these tables. */
-    int look_nbits[1<<HUFF_LOOKAHEAD]; /* # bits, or 0 if too long */
-    unsigned char look_sym[1<<HUFF_LOOKAHEAD]; /* symbol, or unused */
-};
-
-#define QUANT_TABLE_LENGTH  64
-
-/* for type of Huffman table */
-#define DC_LEN 28
-#define AC_LEN 178
-
-struct huffman_table
-{   /* length and code according to JFIF format */
-    int huffmancodes_dc[DC_LEN];
-    int huffmancodes_ac[AC_LEN];
-};
-
-struct frame_component
-{
-    int ID;
-    int horizontal_sampling;
-    int vertical_sampling;
-    int quanttable_select;
-};
-
-struct scan_component
-{
-    int ID;
-    int DC_select;
-    int AC_select;
-};
-
-struct bitstream
-{
-    unsigned long get_buffer; /* current bit-extraction buffer */
-    int bits_left; /* # of unused bits in it */
-    unsigned char* next_input_byte;
-    unsigned char* input_end; /* upper limit +1 */
-};
+#include "jpeg_common.h"
 
 struct jpeg
 {
@@ -113,17 +58,6 @@ struct jpeg
     int subsample_y[3];
 };
 
-
-/* possible return flags for process_markers() */
-#define HUFFTAB   0x0001 /* with huffman table */
-#define QUANTTAB  0x0002 /* with quantization table */
-#define APP0_JFIF 0x0004 /* with APP0 segment following JFIF standard */
-#define FILL_FF   0x0008 /* with 0xFF padding bytes at begin/end */
-#define SOF0      0x0010 /* with SOF0-Segment */
-#define DHT       0x0020 /* with Definition of huffman tables */
-#define SOS       0x0040 /* with Start-of-Scan segment */
-#define DQT       0x0080 /* with definition of quantization table */
-
 /* various helper functions */
 void default_huff_tbl(struct jpeg* p_jpeg);
 void build_lut(struct jpeg* p_jpeg);
diff --git a/apps/plugins/test_core_jpeg.c b/apps/plugins/test_core_jpeg.c
new file mode 100644
index 0000000000..5df69b5792
--- /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;
+}
diff --git a/apps/plugins/viewers.config b/apps/plugins/viewers.config
index ff77dd85b6..09d0455c22 100644
--- a/apps/plugins/viewers.config
+++ b/apps/plugins/viewers.config
@@ -27,6 +27,9 @@ wav,viewers/wavplay,9
 wav,viewers/wavview,10
 wav,viewers/test_codec,-
 bmp,viewers/test_greylib_bitmap_scale,-
+jpeg,viewers/test_core_jpeg,-
+jpe,viewers/test_core_jpeg,-
+jpg,viewers/test_core_jpeg,-
 bmp,apps/rockpaint,11
 bmp,games/sliding_puzzle,11
 mpg,viewers/mpegplayer,4