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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* user intereface of image viewer.
*
* 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 _IMAGE_VIEWER_H
#define _IMAGE_VIEWER_H
#include "plugin.h"
/* different graphics libraries */
#if LCD_DEPTH < 8
#define USEGSLIB
#include <lib/grey.h>
#else
#include <lib/xlcd.h>
#endif
#include <lib/mylcd.h>
#if defined(USEGSLIB) && defined(IMGDEC)
#undef mylcd_ub_
#undef myxlcd_ub_
#define mylcd_ub_(fn) iv->fn
#define myxlcd_ub_(fn) iv->fn
#endif
/* Min memory allowing us to use the plugin buffer
* and thus not stopping the music
* *Very* rough estimation:
* Max 10 000 dir entries * 4bytes/entry (char **) = 40000 bytes
* + 30k code size = 70 000
* + 50k min for image = 120 000
*/
#define MIN_MEM 120000
/* State code for output with return. */
enum {
PLUGIN_OTHER = 0x200,
PLUGIN_ABORT,
PLUGIN_OUTOFMEM,
ZOOM_IN,
ZOOM_OUT,
};
#if (CONFIG_PLATFORM & PLATFORM_NATIVE) && defined(HAVE_DISK_STORAGE)
#define DISK_SPINDOWN
#endif
#if PLUGIN_BUFFER_SIZE >= MIN_MEM
#define USE_PLUG_BUF
#endif
/* Settings. jpeg needs these */
struct imgview_settings
{
#ifdef HAVE_LCD_COLOR
int jpeg_colour_mode;
int jpeg_dither_mode;
#endif
int ss_timeout;
};
/* structure passed to image decoder. */
struct image_info {
int x_size, y_size; /* set size of loaded image in load_image(). */
int width, height; /* set size of resized image in get_image(). */
int x, y; /* display position */
void *data; /* use freely in decoder. not touched in ui. */
};
struct imgdec_api {
const struct imgview_settings *settings;
bool slideshow_enabled; /* run slideshow */
bool running_slideshow; /* loading image because of slideshw */
#ifdef DISK_SPINDOWN
bool immediate_ata_off; /* power down disk after loading */
#endif
#ifdef USE_PLUG_BUF
bool plug_buf; /* are we using the plugin buffer or the audio buffer? */
#endif
/* callback updating a progress meter while image decoding */
void (*cb_progress)(int current, int total);
#ifdef USEGSLIB
void (*gray_bitmap_part)(const unsigned char *src, int src_x, int src_y,
int stride, int x, int y, int width, int height);
#endif
};
/* functions need to be implemented in each image decoders. */
struct image_decoder {
/* set true if unscaled image can be always displayed even when there isn't
* enough memory for resized image. e.g. when using native format to store
* image. */
const bool unscaled_avail;
/* return needed size of buffer to store downscaled image by ds.
* this is used to calculate min downscale. */
int (*img_mem)(int ds);
/* load image from filename. use the passed buffer to store loaded, decoded
* or resized image later, so save it to local variables if needed.
* set width and height of info properly. also, set buf_size to remaining
* size of buf after load image. it is used to calculate min downscale.
* return PLUGIN_ERROR for error. ui will skip to next image. */
int (*load_image)(char *filename, struct image_info *info,
unsigned char *buf, ssize_t *buf_size);
/* downscale loaded image by ds. use the buffer passed to load_image to
* reszie image and/or store resized image.
* return PLUGIN_ERROR for error. ui will skip to next image. */
int (*get_image)(struct image_info *info, int ds);
/* draw part of image */
void (*draw_image_rect)(struct image_info *info,
int x, int y, int width, int height);
};
#define IMGDEC_API_VERSION (PLUGIN_API_VERSION << 4 | 0)
/* image decoder header */
struct imgdec_header {
struct lc_header lc_hdr; /* must be the first */
const struct image_decoder *decoder;
const struct plugin_api **api;
const struct imgdec_api **img_api;
};
#ifdef IMGDEC
extern const struct imgdec_api *iv;
extern const struct image_decoder image_decoder;
#if (CONFIG_PLATFORM & PLATFORM_NATIVE)
#define IMGDEC_HEADER \
const struct plugin_api *rb DATA_ATTR; \
const struct imgdec_api *iv DATA_ATTR; \
const struct imgdec_header __header \
__attribute__ ((section (".header")))= { \
{ PLUGIN_MAGIC, TARGET_ID, IMGDEC_API_VERSION, \
plugin_start_addr, plugin_end_addr }, &image_decoder, &rb, &iv };
#else /* PLATFORM_HOSTED */
#define IMGDEC_HEADER \
const struct plugin_api *rb DATA_ATTR; \
const struct imgdec_api *iv DATA_ATTR; \
const struct imgdec_header __header \
__attribute__((visibility("default"))) = { \
{ PLUGIN_MAGIC, TARGET_ID, IMGDEC_API_VERSION, \
NULL, NULL }, &image_decoder, &rb, &iv };
#endif /* CONFIG_PLATFORM */
#endif
#endif /* _IMAGE_VIEWER_H */
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