Lib to save a bitmap struct to a bmp file. Only works/tested with color bitmaps.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@10254 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/lib/SOURCES

@@ -21,4 +21,7 @@ profile_plugin.c
 xlcd_core.c
 xlcd_draw.c
 xlcd_scroll.c
+#ifdef HAVE_LCD_COLOR
+bmp.c
+#endif
 #endif

apps/plugins/lib/bmp.c

@@ -0,0 +1,84 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Antoine Cellerier <dionoea -at- videolan -dot- org>
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "bmp.h"
+
+#include "lcd.h"
+#include "file.h"
+#include "lcd.h"
+#include "system.h"
+
+#define LE16(x) (htole16(x))&0xff, ((htole16(x))>>8)&0xff
+#define LE32(x) (htole32(x))&0xff, ((htole32(x))>>8)&0xff, ((htole32(x))>>16)&0xff, ((htole32(x))>>24)&0xff
+/**
+ * Save to 24 bit bitmap.
+ */
+int save_bmp_file( char* filename, struct bitmap *bm, struct plugin_api* rb )
+{
+    /* I'm not really sure about this one :) */
+    int line_width = bm->width*3+((bm->width*3)%4?4-((bm->width*3)%4):0);
+
+    const unsigned char header[] =
+    {
+        0x42, 0x4d, /* signature - 'BM' */
+        LE32( bm->height*line_width + 54 + 4*0 ), /* file size in bytes */
+        0x00, 0x00, 0x00, 0x00, /* 0, 0 */
+        LE32( 54 + 4*0 ), /* offset to bitmap */
+        0x28, 0x00, 0x00, 0x00, /* size of this struct (40) */
+        LE32( bm->width ), /* bmap width in pixels */
+        LE32( bm->height ), /* bmap height in pixels */
+        0x01, 0x00, /* num planes - always 1 */
+        LE16( 24 ), /* bits per pixel */
+        LE32( 0 ), /* compression flag */
+        LE32( bm->height*line_width ), /* image size in bytes */
+        0xc4, 0x0e, 0x00, 0x00, /* horz resolution */
+        0xc4, 0x0e, 0x00, 0x00, /* vert resolution */
+        LE32( 0 ), /* 0 -> color table size */
+        LE32( 0 ) /* important color count */
+    };
+
+    int fh;
+    int x,y;
+    if( bm->format != FORMAT_NATIVE ) return -1;
+    fh = rb->PREFIX(creat)( filename, O_WRONLY );
+    if( fh < 0 ) return -1;
+
+    rb->write( fh, header, sizeof( header ) );
+    for( y = bm->height-1; y >= 0; y-- )
+    {
+        for( x = 0; x <  bm->width; x++ )
+        {
+            fb_data *d = (fb_data*)( bm->data ) + (x+y*bm->width);
+            unsigned char c[] =
+            {
+                RGB_UNPACK_BLUE( *d ),
+                RGB_UNPACK_GREEN( *d ),
+                RGB_UNPACK_RED( *d )
+            };
+            rb->write( fh, c, 3 );
+        }
+        for( x = 0; x < 3*bm->width - line_width; x++ )
+        {
+            unsigned char c = 0;
+            rb->write( fh, &c, 1 );
+        }
+    }
+    rb->close( fh );
+    return 1;
+}

apps/plugins/lib/bmp.h

@@ -0,0 +1,30 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Antoine Cellerier <dionoea -at- videolan -dot- org>
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#ifndef _LIB_BMP_H_
+#define _LIB_BMP_H_
+
+#include "lcd.h"
+#include "plugin.h"
+
+/**
+ * Save bitmap to file
+ */
+int save_bmp_file( char* filename, struct bitmap *bm, struct plugin_api* rb  );
+
+#endif