imv/src/imv.c at v4.1.0 · somini/imv

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#include "imv.h"

#include <assert.h>

#include <ctype.h>

#include <errno.h>

#include <getopt.h>

#include <pthread.h>

#include <stdbool.h>

#include <stdint.h>

#include <stdlib.h>

#include <time.h>

#include <unistd.h>

#include <wordexp.h>

#include "backend.h"

#include "binds.h"

#include "canvas.h"

#include "commands.h"

#include "console.h"

#include "image.h"

#include "ini.h"

#include "ipc.h"

#include "list.h"

#include "log.h"

#include "navigator.h"

#include "source.h"

#include "viewport.h"

#include "window.h"

/* Some systems like GNU/Hurd don't define PATH_MAX */

#ifndef PATH_MAX

#define PATH_MAX 4096

#endif

static const char *scaling_label[] = {

"actual size",

"shrink to fit",

"scale to fit",

"crop"

};

enum background_type {

BACKGROUND_SOLID,

BACKGROUND_CHEQUERED,

BACKGROUND_TYPE_COUNT

};

enum internal_event_type {

NEW_IMAGE,

BAD_IMAGE,

NEW_PATH,

COMMAND

};

struct internal_event {

enum internal_event_type type;

union {

struct {

struct imv_image *image;

int frametime;

bool is_new_image;

} new_image;

struct {

char *path;

} new_path;

struct {

char *text;

} command;

} data;

};

struct imv {

/* set to true to trigger clean exit */

bool quit;

/* indicates a new image is being loaded */

bool loading;

/* initial fullscreen state */

bool start_fullscreen;

/* initial window dimensions */

int initial_width;

int initial_height;

/* display some textual info onscreen */

bool overlay_enabled;

/* method for scaling up images: interpolate or nearest neighbour */

enum upscaling_method upscaling_method;

/* dirty state flags */

bool need_redraw;

bool need_rescale;

/* traverse sub-directories for more images */

bool recursive_load;

/* 'next' on the last image goes back to the first */

bool loop_input;

/* print all paths to stdout on clean exit */

bool list_files_at_exit;

/* read paths from stdin, as opposed to image data */

bool paths_from_stdin;

/* scale up / down images to match window, or actual size */

enum scaling_mode scaling_mode;

/* initial pan factor when opening new images */

bool custom_start_pan;

double initial_pan_x, initial_pan_y;

struct {

/* show a solid background colour, or chequerboard pattern */

enum background_type type;

/* the aforementioned background colour */

struct { unsigned char r, g, b; } color;

} background;

/* slideshow state tracking */

struct {

double duration;

double elapsed;

} slideshow;

struct {

/* for animated images, the getTime() time to display the next frame */

double due;

/* how long the next frame to be put onscreen should be displayed for */

double duration;

/* the next frame of an animated image, pre-fetched */

struct imv_image *image;

/* force the next frame to load, even if early */

bool force_next_frame;

} next_frame;

struct imv_image *current_image;

/* overlay font */

struct {

char *name;

int size;

} font;

/* if specified by user, the path of the first image to display */

char *starting_path;

/* list of startup commands to be run on launch, after loading the config */

struct list *startup_commands;

/* the user-specified format strings for the overlay and window title */

char *title_text;

char *overlay_text;

/* imv subsystems */

struct imv_binds *binds;

struct imv_navigator *navigator;

struct list *backends;

struct imv_source *current_source;

struct imv_source *last_source;

struct imv_commands *commands;

struct imv_console *console;

struct imv_ipc *ipc;

struct imv_viewport *view;

struct imv_canvas *canvas;

struct imv_window *window;

/* if reading an image from stdin, this is the buffer for it */

void *stdin_image_data;

size_t stdin_image_data_len;

};

static void command_quit(struct list *args, const char *argstr, void *data);

static void command_pan(struct list *args, const char *argstr, void *data);

static void command_next(struct list *args, const char *argstr, void *data);

static void command_prev(struct list *args, const char *argstr, void *data);

static void command_goto(struct list *args, const char *argstr, void *data);

static void command_zoom(struct list *args, const char *argstr, void *data);

static void command_open(struct list *args, const char *argstr, void *data);

static void command_close(struct list *args, const char *argstr, void *data);

static void command_fullscreen(struct list *args, const char *argstr, void *data);

static void command_overlay(struct list *args, const char *argstr, void *data);

static void command_exec(struct list *args, const char *argstr, void *data);

static void command_center(struct list *args, const char *argstr, void *data);

static void command_reset(struct list *args, const char *argstr, void *data);

static void command_next_frame(struct list *args, const char *argstr, void *data);

static void command_toggle_playing(struct list *args, const char *argstr, void *data);

static void command_set_scaling_mode(struct list *args, const char *argstr, void *data);

static void command_set_upscaling_method(struct list *args, const char *argstr, void *data);

static void command_set_slideshow_duration(struct list *args, const char *argstr, void *data);

static void command_set_background(struct list *args, const char *argstr, void *data);

static void command_bind(struct list *args, const char *argstr, void *data);

static bool setup_window(struct imv *imv);

static void consume_internal_event(struct imv *imv, struct internal_event *event);

static void render_window(struct imv *imv);

static void update_env_vars(struct imv *imv);

static size_t generate_env_text(struct imv *imv, char *buf, size_t len, const char *format);

static size_t read_from_stdin(void **buffer);

/* Finds the next split between commands in a string (';'). Provides a pointer

* to the next character after the delimiter as out, or a pointer to '\0' if

* nothing is left. Also provides the len from start up to the delimiter.

static void split_commands(const char *start, const char **out, size_t *len)

{

bool in_single_quotes = false;

bool in_double_quotes = false;

const char *str = start;

while (*str) {

if (!in_single_quotes && *str == '"') {

in_double_quotes = !in_double_quotes;

} else if (!in_double_quotes && *str == '\'') {

in_single_quotes = !in_single_quotes;

} else if (*str == '\\') {

/* We don't care about the behaviour of any escaped character, just

* make sure to skip over them. We do need to make sure not to allow

* escaping of the null terminator though.

if (str[1] != '\0') {

++str;

}

} else if (!in_single_quotes && !in_double_quotes && *str == ';') {

/* Found a command split that wasn't escaped or quoted */

*len = str - start;

*out = str + 1;

return;

}

++str;

}

*out = str;

*len = str - start;

}

static bool is_legacy_bind(const char *keys)

{

const char *prefix = "<Shift+";

const size_t prefix_len = strlen(prefix);

if (strncmp(keys, prefix, prefix_len)) {

return false;

}

/* Has a Shift prefix. Check for single lower case character. */

if (islower(keys[prefix_len]) && keys[prefix_len+1] == '>') {

return true;

}

return false;

}

static bool add_bind(struct imv *imv, const char *keys, const char *commands)

{

if (is_legacy_bind(keys)) {

imv_log(IMV_WARNING, "'%s' is the legacy bind syntax.\n"

"<Shift+n> would now be <Shift+N>.\n"

"Check the imv(5) man page for more syntax examples.\n", keys);

return true;

}

struct list *list = imv_bind_parse_keys(keys);

if (!list) {

imv_log(IMV_ERROR, "Invalid key combination\n");

return false;

}

char command_buf[512];

const char *next_command;

size_t command_len;

bool success = true;

imv_binds_clear_key(imv->binds, list);

while (*commands != '\0') {

split_commands(commands, &next_command, &command_len);

if (command_len >= sizeof command_buf) {

imv_log(IMV_ERROR, "Command exceeded max length, not binding: %.*s\n", (int)command_len, commands);

imv_binds_clear_key(imv->binds, list);

success = false;

break;

}

strncpy(command_buf, commands, command_len);

command_buf[command_len] = '\0';

enum bind_result result = imv_binds_add(imv->binds, list, command_buf);

if (result == BIND_INVALID_KEYS) {

imv_log(IMV_ERROR, "Invalid keys to bind to");

success = false;

break;

} else if (result == BIND_INVALID_COMMAND) {

imv_log(IMV_ERROR, "No command given to bind to");

success = false;

break;

} else if (result == BIND_CONFLICTS) {

imv_log(IMV_ERROR, "Key combination conflicts with existing bind");

success = false;

break;

}

commands = next_command;

}

list_deep_free(list);

return success;

}

static double cur_time(void)

{

struct timespec ts;

const int rc = clock_gettime(CLOCK_MONOTONIC, &ts);

assert(!rc);

return ts.tv_sec + (double)ts.tv_nsec * 0.000000001;

}

static void source_callback(struct imv_source_message *msg)

{

struct imv *imv = msg->user_data;

if (msg->source != imv->current_source) {

/* We received a message from an old source, tidy up contents

* as required, but ignore it.

if (msg->image) {

imv_image_free(msg->image);

}

return;

}

struct internal_event *event = calloc(1, sizeof *event);

if (msg->image) {

event->type = NEW_IMAGE;

event->data.new_image.image = msg->image;

event->data.new_image.frametime = msg->frametime;

/* Keep track of the last source to send us an image in order to detect

* when we're getting a new image, as opposed to a new frame from the

* same image.

event->data.new_image.is_new_image = msg->source != imv->last_source;

imv->last_source = msg->source;

} else {

event->type = BAD_IMAGE;

}

struct imv_event e = {

.type = IMV_EVENT_CUSTOM,

.data = {

.custom = event

}

};

imv_window_push_event(imv->window, &e);

}

static void command_callback(const char *text, void *data)

{

struct imv *imv = data;

struct internal_event *event = calloc(1, sizeof *event);

event->type = COMMAND;

event->data.command.text = strdup(text);

struct imv_event e = {

.type = IMV_EVENT_CUSTOM,

.data = {

.custom = event

}

};

imv_window_push_event(imv->window, &e);

}

static void key_handler(struct imv *imv, const struct imv_event *event)

{

if (imv_console_is_active(imv->console)) {

if (imv_console_key(imv->console, event->data.keyboard.description)) {

imv->need_redraw = true;

return;

}

imv_console_input(imv->console, event->data.keyboard.text);

} else {

/* In regular mode see if we should enter command mode, otherwise send input

* to the bind system.

if (!strcmp("colon", event->data.keyboard.keyname)) {

imv_console_activate(imv->console);

imv->need_redraw = true;

return;

}

struct list *cmds = imv_bind_handle_event(imv->binds, event->data.keyboard.description);

if (cmds) {

imv_command_exec_list(imv->commands, cmds, imv);

}

imv->need_redraw = true;

}

static void event_handler(void *data, const struct imv_event *e)

{

struct imv *imv = data;

switch (e->type) {

case IMV_EVENT_CLOSE:

imv->quit = true;

break;

case IMV_EVENT_RESIZE:

{

const int ww = e->data.resize.width;

const int wh = e->data.resize.height;

const int bw = e->data.resize.buffer_width;

const int bh = e->data.resize.buffer_height;

imv_viewport_update(imv->view, ww, wh, bw, bh, imv->current_image, imv->scaling_mode);

imv_canvas_resize(imv->canvas, bw, bh);

break;

}

case IMV_EVENT_KEYBOARD:

key_handler(imv, e);

break;

case IMV_EVENT_MOUSE_MOTION:

if (imv_window_get_mouse_button(imv->window, 1)) {

imv_viewport_move(imv->view 10000 , e->data.mouse_motion.dx,

e->data.mouse_motion.dy, imv->current_image);

}

break;

case IMV_EVENT_MOUSE_SCROLL:

{

double x, y;

imv_window_get_mouse_position(imv->window, &x, &y);

imv_viewport_zoom(imv->view, imv->current_image, IMV_ZOOM_MOUSE,

x, y, -e->data.mouse_scroll.dy);

}

break;

case IMV_EVENT_CUSTOM:

consume_internal_event(imv, e->data.custom);

break;

default:

break;

}

static void log_to_stderr(enum imv_log_level level, const char *text, void *data)

{

(void)data;

if (level >= IMV_INFO) {

fprintf(stderr, "%s", text);

}

struct imv *imv_create(void)

{

/* Attach log to stderr */

imv_log_add_log_callback(&log_to_stderr, NULL);

struct imv *imv = calloc(1, sizeof *imv);

imv->initial_width = 1280;

imv->initial_height = 720;

imv->need_redraw = true;

imv->need_rescale = true;

imv->scaling_mode = SCALING_FULL;

imv->loop_input = true;

imv->font.name = strdup("Monospace");

imv->font.size = 24;

imv->binds = imv_binds_create();

imv->navigator = imv_navigator_create();

imv->backends = list_create();

imv->commands = imv_commands_create();

imv->console = imv_console_create();

imv_console_set_command_callback(imv->console, &command_callback, imv);

imv->ipc = imv_ipc_create();

imv_ipc_set_command_callback(imv->ipc, &command_callback, imv);

imv->title_text = strdup(

"imv - [${imv_current_index}/${imv_file_count}]"

" [${imv_width}x${imv_height}] [${imv_scale}%]"

" $imv_current_file [$imv_scaling_mode]"

);

imv->overlay_text = strdup(

"[${imv_current_index}/${imv_file_count}]"

" [${imv_width}x${imv_height}] [${imv_scale}%]"

" $imv_current_file [$imv_scaling_mode]"

);

imv->startup_commands = list_create();

imv_command_register(imv->commands, "quit", &command_quit);

imv_command_register(imv->commands, "pan", &command_pan);

imv_command_register(imv->commands, "next", &command_next);

imv_command_register(imv->commands, "prev", &command_prev);

imv_command_register(imv->commands, "goto", &command_goto);

imv_command_register(imv->commands, "zoom", &command_zoom);

imv_command_register(imv->commands, "open", &command_open);

imv_command_register(imv->commands, "close", &command_close);

imv_command_register(imv->commands, "fullscreen", &command_fullscreen);

imv_command_register(imv->commands, "overlay", &command_overlay);

imv_command_register(imv->commands, "exec", &command_exec);

imv_command_register(imv->commands, "center", &command_center);

imv_command_register(imv->commands, "reset", &command_reset);

imv_command_register(imv->commands, "next_frame", &command_next_frame);

imv_command_register(imv->commands, "toggle_playing", &command_toggle_playing);

imv_command_register(imv->commands, "scaling", &command_set_scaling_mode);

imv_command_register(imv->commands, "upscaling", &command_set_upscaling_method);

imv_command_register(imv->commands, "slideshow", &command_set_slideshow_duration);

imv_command_register(imv->commands, "background", &command_set_background);

imv_command_register(imv->commands, "bind", &command_bind);

imv_command_alias(imv->commands, "q", "quit");

imv_command_alias(imv->commands, "n", "next");

imv_command_alias(imv->commands, "p", "prev");

imv_command_alias(imv->commands, "g", "goto");

imv_command_alias(imv->commands, "z", "zoom");

imv_command_alias(imv->commands, "o", "open");

imv_command_alias(imv->commands, "bg", "background");

imv_command_alias(imv->commands, "ss", "slideshow");

/* aliases to improve backwards compatibility with <v4 */

imv_command_alias(imv->commands, "select_rel", "next");

imv_command_alias(imv->commands, "select_abs", "goto");

imv_command_alias(imv->commands, "scaling_method", "scaling");

add_bind(imv, "q", "quit");

add_bind(imv, "<Left>", "prev");

add_bind(imv, "<bracketleft>", "prev");

add_bind(imv, "<Right>", "next");

add_bind(imv, "<bracketright>", "next");

add_bind(imv, "gg", "goto 0");

add_bind(imv, "<Shift+G>", "goto -1");

add_bind(imv, "j", "pan 0 -50");

add_bind(imv, "k", "pan 0 50");

add_bind(imv, "h", "pan 50 0");

add_bind(imv, "l", "pan -50 0");

add_bind(imv, "x", "close");

add_bind(imv, "f", "fullscreen");

add_bind(imv, "d", "overlay");

add_bind(imv, "p", "exec echo $imv_current_file");

add_bind(imv, "<Up>", "zoom 1");

add_bind(imv, "<Shift+plus>", "zoom 1");

add_bind(imv, "i", "zoom 1");

add_bind(imv, "<Down>", "zoom -1");

add_bind(imv, "<minus>", "zoom -1");

add_bind(imv, "o", "zoom -1");

add_bind(imv, "c", "center");

add_bind(imv, "s", "scaling next");

add_bind(imv, "<Shift+S>", "upscaling next");

add_bind(imv, "a", "zoom actual");

add_bind(imv, "r", "reset");

add_bind(imv, "<period>", "next_frame");

add_bind(imv, "<space>", "toggle_playing");

add_bind(imv, "t", "slideshow +1");

add_bind(imv, "<Shift+T>", "slideshow -1");

return imv;

}

void imv_free(struct imv *imv)

{

free(imv->font.name);

free(imv->title_text);

free(imv->overlay_text);

imv_binds_free(imv->binds);

imv_navigator_free(imv->navigator);

if (imv->current_source) {

imv_source_free(imv->current_source);

}

imv_commands_free(imv->commands);

imv_console_free(imv->console);

imv_ipc_free(imv->ipc);

imv_viewport_free(imv->view);

imv_canvas_free(imv->canvas);

if (imv->current_image) {

imv_image_free(imv->current_image);

}

if (imv->next_frame.image) {

imv_image_free(imv->next_frame.image);

}

if (imv->stdin_image_data) {

free(imv->stdin_image_data);

}

if (imv->window) {

imv_window_free(imv->window);

}

list_free(imv->backends);

list_free(imv->startup_commands);

free(imv);

}

void imv_install_backend(struct imv *imv, const struct imv_backend *backend)

{

list_append(imv->backends, (void*)backend);

}

static bool parse_bg(struct imv *imv, const char *bg)

{

if (!strcmp("checks", bg)) {

imv->background.type = BACKGROUND_CHEQUERED;

} else {

imv->background.type = BACKGROUND_SOLID;

if (*bg == '#')

++bg;

char *ep;

uint32_t n = strtoul(bg, &ep, 16);

if (*ep != '\0' || ep - bg != 6 || n > 0xFFFFFF) {

imv_log(IMV_ERROR, "Invalid hex color: '%s'\n", bg);

return false;

}

imv->background.color.b = n & 0xFF;

imv->background.color.g = (n >> 8) & 0xFF;

imv->background.color.r = (n >> 16);

}

return true;

}

static bool parse_slideshow_duration(struct imv *imv, const char *duration)

{

char *decimal;

imv->slideshow.duration = strtod(duration, &decimal);

return true;

}

static bool parse_scaling_mode(struct imv *imv, const char *mode)

{

if (!strcmp(mode, "shrink")) {

imv->scaling_mode = SCALING_DOWN;

return true;

}

if (!strcmp(mode, "full")) {

imv->scaling_mode = SCALING_FULL;

return true;

}

if (!strcmp(mode, "crop")) {

imv->scaling_mode = SCALING_CROP;

return true;

}

if (!strcmp(mode, "none")) {

imv->scaling_mode = SCALING_NONE;

return true;

}

return false;

}

static bool parse_upscaling_method(struct imv *imv, const char *method)

{

if (!strcmp(method, "linear")) {

imv->upscaling_method = UPSCALING_LINEAR;

return true;

}

if (!strcmp(method, "nearest_neighbour")) {

imv->upscaling_method = UPSCALING_NEAREST_NEIGHBOUR;

return true;

}

return false;

}

static bool parse_initial_pan(struct imv *imv, const char *pan_params)

{

char *next_val;

long int val_x = strtol(pan_params, &next_val, 10);

long int val_y = strtol(next_val, NULL, 10);

imv->custom_start_pan = true;

imv->initial_pan_x = (double)val_x / (double)100;

imv->initial_pan_y = (double)val_y / (double)100;

return true;

}

static void *load_paths_from_stdin(void *data)

{

struct imv *imv = data;

imv_log(IMV_INFO, "Reading paths from stdin...");

char buf[PATH_MAX];

while (fgets(buf, sizeof(buf), stdin) != NULL) {

size_t len = strlen(buf);

if (buf[len-1] == '\n') {

buf[--len] = 0;

}

if (len > 0) {

struct internal_event *event = calloc(1, sizeof *event);

event->type = NEW_PATH;

event->data.new_path.path = strdup(buf);

struct imv_event e = {

.type = IMV_EVENT_CUSTOM,

.data = {

.custom = event

}

};

imv_window_push_event(imv->window, &e);

}

return NULL;

}

static void print_help(struct imv *imv)

{

printf("imv %s\nSee manual for usage information.\n", IMV_VERSION);

puts("This version of imv has been compiled with the following backends:\n");

for (size_t i = 0; i < imv->backends->len; ++i) {

struct imv_backend *backend = imv->backends->items[i];

printf("Name: %s\n"

"Description: %s\n"

"Website: %s\n"

"License: %s\n\n",

backend->name,

backend->description,

backend->website,

backend->license);

}

puts("imv's full source code is published under the terms of the MIT\n"

"license, and can be found at https://github.com/eXeC64/imv\n"

"\n"

"imv uses the inih library to parse ini files.\n"

"See https://github.com/benhoyt/inih for details.\n"

"inih is used under the New (3-clause) BSD license.");

}

bool imv_parse_args(struct imv *imv, int argc, char **argv)

{

/* Do not print getopt errors */

opterr = 0;

int o;

/* TODO getopt_long */

while ((o = getopt(argc, argv, "frdxhvlu:s:n:b:t:c:")) != -1) {

switch(o) {

case 'f': imv->start_fullscreen = true; break;

case 'r': imv->recursive_load = true; break;

case 'd': imv->overlay_enabled = true; break;

case 'x': imv->loop_input = false; break;

case 'l': imv->list_files_at_exit = true; break;

case 'n': imv->starting_path = optarg; break;

case 'h':

print_help(imv);

imv->quit = true;

return true;

case 'v':

printf("Version: %s\n", IMV_VERSION);

imv->quit = true;

return false;

case 's':

if (!parse_scaling_mode(imv, optarg)) {

imv_log(IMV_ERROR, "Invalid scaling mode. Aborting.\n");

return false;

}

break;

case 'u':

if (!parse_upscaling_method(imv, optarg)) {

imv_log(IMV_ERROR, "Invalid upscaling method. Aborting.\n");

return false;

}

break;

case 'b':

if (!parse_bg(imv, optarg)) {

imv_log(IMV_ERROR, "Invalid background. Aborting.\n");

return false;

}

break;

case 't':

if (!parse_slideshow_duration(imv, optarg)) {

imv_log(IMV_ERROR, "Invalid slideshow duration. Aborting.\n");

return false;

}

break;

case 'c': list_append(imv->startup_commands, optarg); break;

case '?':

imv_log(IMV_ERROR, "Unknown argument '%c'. Aborting.\n", optopt);

return false;

}

argc -= optind;

argv += optind;

/* if no paths are given as args, expect them from stdin */

if (argc == 0) {

imv->paths_from_stdin = true;

} else {

/* otherwise, add the paths */

bool data_from_stdin = false;

for (int i = 0; i < argc; ++i) {

/* Special case: '-' denotes reading image data from stdin */

if (!strcmp("-", argv[i])) {

if (imv->paths_from_stdin) {

imv_log(IMV_ERROR, "Can't read paths AND image data from stdin. Aborting.\n");

return false;

} else if (data_from_stdin) {

imv_log(IMV_ERROR, "Can't read image data from stdin twice. Aborting.\n");

return false;

}

data_from_stdin = true;

imv->stdin_image_data_len = read_from_stdin(&imv->stdin_image_data);

}

imv_add_path(imv, argv[i]);

}

return true;

}

void imv_add_path(struct imv *imv, const char *path)

{

imv_navigator_add(imv->navigator, path, imv->recursive_load);

}

int imv_run(struct imv *imv)

{

if (imv->quit)

return 0;

if (!setup_window(imv))

return 1;

/* if loading paths from stdin, kick off a thread to do that - we'll receive

* events back via internal events */

if (imv->paths_from_stdin) {

pthread_t thread;

pthread_create(&thread, NULL, load_paths_from_stdin, imv);

pthread_detach(thread);

}

if (imv->starting_path) {

ssize_t index = imv_navigator_find_path(imv->navigator, imv->starting_path);

if (index == -1) {

index = (int) strtol(imv->starting_path, NULL, 10);

index -= 1; /* input is 1-indexed, internally we're 0 indexed */

if (errno == EINVAL) {

index = -1;

}

if (index >= 0) {

imv_navigator_select_abs(imv->navigator, index);

} else {

imv_log(IMV_ERROR, "Invalid starting image: %s\n", imv->starting_path);

}

/* Push any startup commands into the event queue */

for (size_t i = 0; i < imv->startup_commands->len; ++i) {

command_callback(imv->startup_commands->items[i], imv);

}

list_free(imv->startup_commands);

imv->startup_commands = NULL;

/* time keeping */

double last_time = cur_time();

double current_time;

while (!imv->quit) {

/* Check if navigator wrapped around paths lists */

if (!imv->loop_input && imv_navigator_wrapped(imv->navigator)) {

break;

}

/* If the user has changed image, start loading the new one. It's possible

* that there are lots of unsupported files listed back to back, so we

* may immediate close one and navigate onto the next. So we attempt to

* load in a while loop until the navigation stops.

while (imv_navigator_poll_changed(imv->navigator)) {

const char *current_path = imv_navigator_selection(imv->navigator);

/* check we got a path back */

if (strcmp("", current_path)) {

const bool path_is_stdin = !strcmp("-", current_path);

struct imv_source *new_source;

enum backend_result result = BACKEND_UNSUPPORTED;

if (!imv->backends) {

imv_log(IMV_ERROR, "No backends installed. Unable to load image.\n");

}

for (size_t i = 0; i < imv->backends->len; ++i) {

const struct imv_backend *backend = imv->backends->items[i];

if (path_is_stdin) {

if (!backend->open_memory) {

/* memory loading unsupported by backend */

continue;

}

result = backend->open_memory(imv->stdin_image_data,

imv->stdin_image_data_len, &new_source);

} else {

if (!backend->open_path) {

/* path loading unsupported by backend */

continue;

}

result = backend->open_path(current_path, &new_source);

}

if (result == BACKEND_UNSUPPORTED) {

/* Try the next backend */

continue;

} else {

break;

}

if (result == BACKEND_SUCCESS) {

if (imv->current_source) {

imv_source_async_free(imv->current_source);

}

imv->current_source = new_source;

imv_source_set_callback(imv->current_source, &source_callback, imv);

imv_source_async_load_first_frame(imv->current_source);

imv->loading = true;

imv_viewport_set_playing(imv->view, true);

char title[1024];

generate_env_text(imv, title, sizeof title, imv->title_text);

imv_window_set_title(imv->window, title);

} else {

/* Error loading path so remove it from the navigator */

imv_navigator_remove(imv->navigator, current_path);

}

} else {

/* No image currently selected */

if (imv->current_image) {

imv_image_free(imv->current_image);

imv->current_image = NULL;

}

if (imv->need_rescale) {

imv->need_rescale = false;

imv_viewport_rescale(imv->view, imv->current_image, imv->scaling_mode);

}

current_time = cur_time();

/* Check if a new frame is due */

bool should_change_frame = false;

if (imv->next_frame.force_next_frame && imv->next_frame.image) {

should_change_frame = true;

}

if (imv_viewport_is_playing(imv->view) && imv->next_frame.image

&& imv->next_frame.due && imv->next_frame.due <= current_time) {

should_change_frame = true;

}

if (should_change_frame) {

if (imv->current_image) {

imv_image_free(imv->current_image);

}

imv->current_image = imv->next_frame.image;

imv->next_frame.image = NULL;

imv->next_frame.due = current_time + imv->next_frame.duration;

imv->next_frame.duration = 0;

imv->next_frame.force_next_frame = false;

imv->need_redraw = true;

/* Trigger loading of a new frame, now this one's being displayed */

if (imv->current_source) {

imv_source_async_load_next_frame(imv->current_source);

}

/* handle slideshow */

if (imv->slideshow.duration != 0.0) {

double dt = current_time - last_time;

imv->slideshow.elapsed += dt;

if (imv->slideshow.elapsed >= imv->slideshow.duration) {

imv_navigator_select_rel(imv->navigator, 1);

imv->slideshow.elapsed = 0;

imv->need_redraw = true;

}

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