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

apps/plugin.c

@@ -643,8 +643,12 @@ static const struct plugin_api rockbox_api = {
 	lcd_pal256_update_pal,
 #endif
 #endif
-#if defined(HAVE_LCD_BITMAP) && LCD_DEPTH > 1
+#ifdef HAVE_LCD_BITMAP
+#if LCD_DEPTH > 1
     read_jpeg_file,
+    read_jpeg_fd,
+#endif
+    read_bmp_fd,
 #endif
 };
 

apps/plugin.h

@@ -79,9 +79,7 @@ void* plugin_get_buffer(size_t *buffer_size);
 #ifdef HAVE_LCD_BITMAP
 #include "screendump.h"
 #include "scrollbar.h"
-#if LCD_DEPTH > 1
 #include "jpeg_load.h"
-#endif
 #include "../recorder/bmp.h"
 #endif
 #include "statusbar.h"
@@ -131,7 +129,7 @@ void* plugin_get_buffer(size_t *buffer_size);
 #define PLUGIN_MAGIC 0x526F634B /* RocK */
 
 /* increase this every time the api struct changes */
-#define PLUGIN_API_VERSION 148
+#define PLUGIN_API_VERSION 149
 
 /* update this to latest version if a change to the api struct breaks
    backwards compatibility (and please take the opportunity to sort in any
@@ -806,9 +804,15 @@ struct plugin_api {
 #endif
 #endif
 
-#if defined(HAVE_LCD_BITMAP) && LCD_DEPTH > 1
+#ifdef HAVE_LCD_BITMAP
+#if LCD_DEPTH > 1
     int (*read_jpeg_file)(const char* filename, struct bitmap *bm, int maxsize,
                           int format, const struct custom_format *cformat);
+    int (*read_jpeg_fd)(int fd, struct bitmap *bm, int maxsize,
+                        int format, const struct custom_format *cformat);
+#endif
+    int (*read_bmp_fd)(int fd, struct bitmap *bm, int maxsize,
+                       int format, const struct custom_format *cformat);
 #endif
 };
 

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

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

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);
+}

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
+