flipperzero-firmware/applications/desktop/helpers/slideshow.c

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C
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#include "slideshow.h"
#include <stddef.h>
#include <storage/storage.h>
#include <gui/icon.h>
#include <gui/icon_i.h>
#include <furi/dangerous_defines.h>
#define SLIDESHOW_MAGIC 0x72676468
#define SLIDESHOW_MAX_SUPPORTED_VERSION 1
struct Slideshow {
Icon icon;
uint32_t current_frame;
bool loaded;
};
#pragma pack(push, 1)
typedef struct {
uint32_t magic;
uint8_t version;
uint8_t width;
uint8_t height;
uint8_t frame_count;
} SlideshowFileHeader;
_Static_assert(sizeof(SlideshowFileHeader) == 8, "Incorrect SlideshowFileHeader size");
typedef struct {
uint16_t size;
} SlideshowFrameHeader;
_Static_assert(sizeof(SlideshowFrameHeader) == 2, "Incorrect SlideshowFrameHeader size");
#pragma pack(pop)
Slideshow* slideshow_alloc() {
Slideshow* ret = malloc(sizeof(Slideshow));
ret->loaded = false;
return ret;
}
void slideshow_free(Slideshow* slideshow) {
Icon* icon = &slideshow->icon;
if(icon) {
for(int frame_idx = 0; frame_idx < icon->frame_count; ++frame_idx) {
uint8_t* frame_data = (uint8_t*)icon->frames[frame_idx];
free(frame_data);
}
free((uint8_t**)icon->frames);
}
free(slideshow);
}
bool slideshow_load(Slideshow* slideshow, const char* fspath) {
Storage* storage = furi_record_open("storage");
File* slideshow_file = storage_file_alloc(storage);
slideshow->loaded = false;
do {
if(!storage_file_open(slideshow_file, fspath, FSAM_READ, FSOM_OPEN_EXISTING)) {
break;
}
SlideshowFileHeader header;
if((storage_file_read(slideshow_file, &header, sizeof(header)) != sizeof(header)) ||
(header.magic != SLIDESHOW_MAGIC) ||
(header.version > SLIDESHOW_MAX_SUPPORTED_VERSION)) {
break;
}
Icon* icon = &slideshow->icon;
FURI_CONST_ASSIGN(icon->frame_count, header.frame_count);
FURI_CONST_ASSIGN(icon->width, header.width);
FURI_CONST_ASSIGN(icon->height, header.height);
icon->frames = malloc(header.frame_count * sizeof(uint8_t*));
for(int frame_idx = 0; frame_idx < header.frame_count; ++frame_idx) {
SlideshowFrameHeader frame_header;
if(storage_file_read(slideshow_file, &frame_header, sizeof(frame_header)) !=
sizeof(frame_header)) {
break;
}
FURI_CONST_ASSIGN_PTR(icon->frames[frame_idx], malloc(frame_header.size));
uint8_t* frame_data = (uint8_t*)icon->frames[frame_idx];
if(storage_file_read(slideshow_file, frame_data, frame_header.size) !=
frame_header.size) {
break;
}
slideshow->loaded = (frame_idx + 1) == header.frame_count;
}
} while(false);
storage_file_free(slideshow_file);
furi_record_close("storage");
return slideshow->loaded;
}
bool slideshow_is_loaded(Slideshow* slideshow) {
return slideshow->loaded;
}
bool slideshow_advance(Slideshow* slideshow) {
uint8_t next_frame = slideshow->current_frame + 1;
if(next_frame < slideshow->icon.frame_count) {
slideshow->current_frame = next_frame;
return true;
}
return false;
}
void slideshow_goback(Slideshow* slideshow) {
if(slideshow->current_frame > 0) {
slideshow->current_frame--;
}
}
void slideshow_draw(Slideshow* slideshow, Canvas* canvas, uint8_t x, uint8_t y) {
furi_assert(slideshow->current_frame < slideshow->icon.frame_count);
canvas_draw_bitmap(
canvas,
x,
y,
slideshow->icon.width,
slideshow->icon.height,
slideshow->icon.frames[slideshow->current_frame]);
}