Add read_<image>_fd functions to plugin API, add feature_wrappers.h handling for them, and add read_image.[ch] wrapper for reading image files with automatic type detection.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20840 a1c6a512-1295-4272-9138-f99709370657

4 files changed, 92 insertions, 0 deletions

diff --git a/apps/plugins/lib/SOURCES b/apps/plugins/lib/SOURCES
index 7dda416..dfdd569 100644
--- a/apps/plugins/lib/SOURCES
+++ b/apps/plugins/lib/SOURCES
@@ -41,6 +41,7 @@ xlcd_core.c
 xlcd_draw.c
 xlcd_scroll.c
 pluginlib_bmp.c
+read_image.c
 #ifdef HAVE_LCD_COLOR
 bmp_smooth_scale.c
 #endif
diff --git a/apps/plugins/lib/feature_wrappers.h b/apps/plugins/lib/feature_wrappers.h
index 22ce779..cf840e6 100644
--- a/apps/plugins/lib/feature_wrappers.h
+++ b/apps/plugins/lib/feature_wrappers.h
@@ -43,8 +43,10 @@
  */
 #if LCD_DEPTH > 1
 #define scaled_read_bmp_file rb->read_bmp_file
+#define scaled_read_bmp_fd rb->read_bmp_fd
 #else
 #define scaled_read_bmp_file read_bmp_file
+#define scaled_read_bmp_fd read_bmp_fd
 #endif
 
 #endif
diff --git a/apps/plugins/lib/read_image.c b/apps/plugins/lib/read_image.c
new file mode 100644
index 0000000..0420ed8
--- /dev/null
+++ b/apps/plugins/lib/read_image.c
@@ -0,0 +1,55 @@
+/***************************************************************************
+*             __________               __   ___.
+*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+*                     \/            \/     \/    \/            \/
+* $Id$
+*
+* Copyright (C) 2009 by Andrew Mahone
+*
+* This is a wrapper for the core jpeg_load.c
+*
+* 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 "feature_wrappers.h"
+
+int read_image_file(const char* filename, struct bitmap *bm, int maxsize,
+                    int format, const struct custom_format *cformat)
+{
+#if LCD_DEPTH > 1
+    int namelen = rb->strlen(filename);
+    if (rb->strcmp(filename + namelen - 4, ".bmp"))
+        return read_jpeg_file(filename, bm, maxsize, format, cformat);
+    else
+#endif
+        return scaled_read_bmp_file(filename, bm, maxsize, format, cformat);
+}
+
+int read_image_file_offset(int offset, const char* filename, struct bitmap *bm,
+                           int maxsize, int format,
+                           const struct custom_format *cformat)
+{
+    int fd = rb->open(filename, O_RDONLY);
+    if (fd < 0)
+        return fd;
+    if (offset != rb->lseek(fd, offset, SEEK_SET))
+        return -1;
+#if LCD_DEPTH > 1
+    int namelen = rb->strlen(filename);
+    if (rb->strcmp(filename + namelen - 4, ".bmp"))
+        return read_jpeg_fd(fd, bm, maxsize, format, cformat);
+    else
+#endif
+        return scaled_read_bmp_fd(fd, bm, maxsize, format, cformat);
+}
diff --git a/apps/plugins/lib/read_image.h b/apps/plugins/lib/read_image.h
new file mode 100644
index 0000000..3e23668
--- /dev/null
+++ b/apps/plugins/lib/read_image.h
@@ -0,0 +1,34 @@
+/***************************************************************************
+*             __________               __   ___.
+*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+*                     \/            \/     \/    \/            \/
+* $Id$
+*
+* Copyright (C) 2009 by Andrew Mahone
+*
+* This is a wrapper for the core jpeg_load.c
+*
+* 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 _LIB_READ_IMAGE_H_
+#define _LIB_READ_IMAGE_H_
+#include <plugin.h>
+
+int read_image_file(const char* filename, struct bitmap *bm, int maxsize,
+                    int format, const struct custom_format *cformat);
+int read_image_file_offset(int offset, const char* filename, struct bitmap *bm,
+                           int maxsize, int format,
+                           const struct custom_format *cformat);
+#endif
+