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media: use table instead of linked list for media

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For consistency with equipment, use our table macros for pictures.
Generally tables (arrays) are preferred over linked lists, because
they allow random access.

This is mostly copy & paste of the equipment code.

Sadly, our table macros are quite messy and need some revamping.
Therefore, the resulting code is likewise somewhat messy.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2020-04-11 17:41:56 +02:00 • committed by Dirk Hohndel
parent 282041e228
commit 989d6a3f96
15 changed files with 136 additions and 106 deletions
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22
core/picture.h
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@ -4,6 +4,7 @@
// picture (more precisely media) related strutures and functions
#include "units.h"
#include <stddef.h> // For NULL
#ifdef __cplusplus
extern "C" {
@ -13,11 +14,26 @@ struct picture {
char *filename;
offset_t offset;
location_t location;
struct picture *next;
};
static const struct picture empty_picture = { NULL, { 0 }, { { 0 }, { 0 } } };
/* Table of pictures. Attention: this stores pictures,
* *not* pointers to pictures. This has two crucial consequences:
* 1) Pointers to pictures are not stable. They may be
* invalidated if the table is reallocated.
* 2) add_to_picture_table(), etc. take ownership of the
* picture. Notably of the filename. */
struct picture_table {
int nr, allocated;
struct picture *pictures;
};
extern struct picture *alloc_picture();
extern void free_picture(struct picture *picture);
/* picture table functions */
extern void clear_picture_table(struct picture_table *);
extern void add_to_picture_table(struct picture_table *, int idx, struct picture pic);
extern void copy_pictures(const struct picture_table *s, struct picture_table *d);
extern void add_picture(struct picture_table *, struct picture newpic);
extern bool remove_picture(struct picture_table *, const char *filename);
#ifdef __cplusplus
}