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|
/* Copyright (c) 2015 imv authors
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 program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <limits.h>
#include <stdio.h>
#include <stddef.h>
#include <stdint.h>
#include <unistd.h>
#include <SDL2/SDL.h>
#include <SDL2/SDL_ttf.h>
#include <FreeImage.h>
#include <getopt.h>
#include <ctype.h>
#include <poll.h>
#include <errno.h>
#include "loader.h"
#include "texture.h"
#include "navigator.h"
#include "viewport.h"
#include "util.h"
enum scaling_mode {
NONE,
DOWN,
FULL
};
static char *scaling_label[] = {
"actual size",
"best fit",
"perfect fit"
};
struct {
int fullscreen;
int stdin_list;
int recursive;
int scaling;
int nearest_neighbour;
int solid_bg;
int list;
unsigned long delay;
int cycle;
unsigned char bg_r;
unsigned char bg_g;
unsigned char bg_b;
int overlay;
char *overlay_str;
const char *start_at;
const char *font;
} g_options = {
.fullscreen = 0,
.stdin_list = 0,
.recursive = 0,
.scaling = FULL,
.nearest_neighbour = 0,
.solid_bg = 1,
.list = 0,
.delay = 0,
.cycle = 1,
.bg_r = 0,
.bg_g = 0,
.bg_b = 0,
.overlay = 0,
.overlay_str = NULL,
.start_at = NULL,
.font = "Monospace:24",
};
static void print_usage(void)
{
fprintf(stdout,
"imv %s\n"
"See manual for usage information.\n"
"\n"
"Legal:\n"
"This program is free software; you can redistribute it and/or\n"
"modify it under the terms of the GNU General Public License\n"
"as published by the Free Software Foundation; either version 2\n"
"of the License, or (at your option) any later version.\n"
"\n"
"This software uses the FreeImage open source image library.\n"
"See http://freeimage.sourceforge.net for details.\n"
"FreeImage is used under the GNU GPLv2.\n"
, IMV_VERSION);
}
static void parse_args(int argc, char** argv)
{
/* Do not print getopt errors */
opterr = 0;
char *argp, o;
while((o = getopt(argc, argv, "firasSudxhln:b:e:t:")) != -1) {
switch(o) {
case 'f': g_options.fullscreen = 1; break;
case 'i':
g_options.stdin_list = 1;
fprintf(stderr, "Warning: '-i' is deprecated. No flag is needed.\n");
break;
case 'r': g_options.recursive = 1; break;
case 'a': g_options.scaling = NONE; break;
case 's': g_options.scaling = DOWN; break;
case 'S': g_options.scaling = FULL; break;
case 'u': g_options.nearest_neighbour = 1; break;
case 'd': g_options.overlay = 1; break;
case 'x': g_options.cycle = 0; break;
case 'h': print_usage(); exit(0); break;
case 'l': g_options.list = 1; break;
case 'n':
g_options.start_at = optarg;
break;
case 'b':
if(strcmp("checks", optarg) == 0) {
g_options.solid_bg = 0;
} else {
g_options.solid_bg = 1;
if(parse_hex_color(optarg,
&g_options.bg_r, &g_options.bg_g, &g_options.bg_b) != 0) {
fprintf(stderr, "Invalid hex color: '%s'\n", optarg);
exit(1);
}
}
break;
case 'e':
g_options.font = optarg;
break;
case 't':
g_options.delay = strtoul(optarg, &argp, 10);
g_options.delay *= 1000;
if (*argp == '.') {
char *ep;
long delay = strtoul(++argp, &ep, 10);
for (int i = 3 - (ep - argp); i; i--) {
delay *= 10;
}
if (delay < 1000) {
g_options.delay += delay;
} else {
g_options.delay = ULONG_MAX;
}
}
if (g_options.delay == ULONG_MAX) {
fprintf(stderr, "Wrong slideshow delay '%s'. Aborting.\n", optarg);
exit(1);
}
break;
case '?':
fprintf(stderr, "Unknown argument '%c'. Aborting.\n", optopt);
exit(1);
}
}
}
int main(int argc, char** argv)
{
struct imv_navigator nav;
imv_navigator_init(&nav);
/* parse any command line options given */
parse_args(argc, argv);
argc -= optind;
argv += optind;
/* if no names are given, expect them on stdin */
if(argc == 0) {
g_options.stdin_list = 1;
}
/* if the user asked to load paths from stdin, set up poll(2)ing and read
the first path */
struct pollfd rfds[1];
if(g_options.stdin_list) {
rfds[0].fd = STDIN_FILENO;
rfds[0].events = POLLIN;
fprintf(stderr, "Reading paths from stdin...");
char buf[PATH_MAX];
char *stdin_ok;
while((stdin_ok = fgets(buf, sizeof(buf), stdin)) != NULL) {
size_t len = strlen(buf);
if(buf[len-1] == '\n') {
buf[--len] = 0;
}
if(len > 0) {
imv_navigator_add(&nav, buf, g_options.recursive);
break;
}
}
if(!stdin_ok) {
fprintf(stderr, " no input!\n");
return -1;
}
fprintf(stderr, "\n");
}
void *stdin_buffer = NULL;
size_t stdin_buffer_size = 0;
int stdin_error = 0;
/* handle any image paths given as arguments */
for(int i = 0; i < argc; ++i) {
/* special case: '-' is actually an option */
if(!strcmp("-",argv[i])) {
if (stdin_buffer) {
fprintf(stderr, "Can't read from stdin twice\n");
exit(1);
}
stdin_buffer_size = read_from_stdin(&stdin_buffer);
if (stdin_buffer_size == 0) {
perror(NULL);
continue; /* we can't recover from the freed buffer, just ignore it */
}
stdin_error = errno;
errno = 0; /* clear errno */
}
/* add the given path to the list to load */
imv_navigator_add(&nav, argv[i], g_options.recursive);
}
/* if we weren't given any paths we have nothing to view. exit */
if(!imv_navigator_selection(&nav)) {
fprintf(stderr, "No input files. Exiting.\n");
exit(1);
}
/* go to the chosen starting image if possible */
if(g_options.start_at) {
int start_index = imv_navigator_find_path(&nav, g_options.start_at);
if(start_index < 0) {
start_index = strtol(g_options.start_at,NULL,10) - 1;
}
imv_navigator_select_str(&nav, start_index);
}
/* we've got something to display, so create an SDL window */
if(SDL_Init(SDL_INIT_VIDEO) != 0) {
fprintf(stderr, "SDL Failed to Init: %s\n", SDL_GetError());
exit(1);
}
/* width and height arbitrarily chosen. Perhaps there's a smarter way to
* set this */
const int width = 1280;
const int height = 720;
SDL_Window *window = SDL_CreateWindow(
"imv",
SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED,
width, height,
SDL_WINDOW_RESIZABLE);
if(!window) {
fprintf(stderr, "SDL Failed to create window: %s\n", SDL_GetError());
SDL_Quit();
exit(1);
}
/* we'll use SDL's built-in renderer, hardware accelerated if possible */
SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, 0);
if(!renderer) {
fprintf(stderr, "SDL Failed to create renderer: %s\n", SDL_GetError());
SDL_DestroyWindow(window);
SDL_Quit();
exit(1);
}
/* use the appropriate resampling method */
SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY,
g_options.nearest_neighbour ? "0" : "1");
/* construct a chequered background texture */
SDL_Texture *chequered_tex = NULL;
if(!g_options.solid_bg) {
chequered_tex = create_chequered(renderer);
}
/* set up the required fonts and surfaces for displaying the overlay */
TTF_Init();
TTF_Font *font = load_font(g_options.font);
if(!font) {
fprintf(stderr, "Error loading font: %s\n", TTF_GetError());
}
/* create our main classes on the stack*/
struct imv_loader ldr;
imv_init_loader(&ldr);
struct imv_texture tex;
imv_init_texture(&tex, renderer);
struct imv_viewport view;
imv_init_viewport(&view, window);
/* put us in fullscren mode to begin with if requested */
if(g_options.fullscreen) {
imv_viewport_toggle_fullscreen(&view);
}
/* help keeping track of time */
unsigned int last_time;
unsigned int current_time;
/* keep file change polling rate under control */
static uint8_t poll_countdown = UINT8_MAX;
/* do we need to redraw the window? */
int need_redraw = 1;
int need_rescale = 0;
/* used to calculate when to skip to the next image in slideshow mode */
unsigned long delay_msec = 0;
/* initialize variables holding image dimentions */
int iw = 0, ih = 0;
int quit = 0;
while(!quit) {
/* handle any input/window events sent by SDL */
SDL_Event e;
while(!quit && SDL_PollEvent(&e)) {
switch(e.type) {
case SDL_QUIT:
quit = 1;
break;
case SDL_KEYDOWN:
SDL_ShowCursor(SDL_DISABLE);
switch (e.key.keysym.sym) {
case SDLK_q:
quit = 1;
break;
case SDLK_LEFTBRACKET:
case SDLK_LEFT:
if(!imv_navigator_select_rel(&nav, -1, g_options.cycle)) {
quit = 1;
}
/* reset slideshow delay */
delay_msec = 0;
break;
case SDLK_RIGHTBRACKET:
case SDLK_RIGHT:
if(!imv_navigator_select_rel(&nav, 1, g_options.cycle)) {
quit = 1;
}
/* reset slideshow delay */
delay_msec = 0;
break;
case SDLK_EQUALS:
case SDLK_PLUS:
case SDLK_i:
case SDLK_UP:
imv_viewport_zoom(&view, &tex, IMV_ZOOM_KEYBOARD, 1);
break;
case SDLK_MINUS:
case SDLK_o:
case SDLK_DOWN:
imv_viewport_zoom(&view, &tex, IMV_ZOOM_KEYBOARD, -1);
break;
case SDLK_s:
if((g_options.scaling += 1) > FULL) {
g_options.scaling = NONE;
}
/* FALLTHROUGH */
case SDLK_r:
need_rescale = 1;
need_redraw = 1;
break;
case SDLK_a:
imv_viewport_scale_to_actual(&view, &tex);
break;
case SDLK_c:
imv_viewport_center(&view, &tex);
break;
case SDLK_j:
imv_viewport_move(&view, 0, -50);
break;
case SDLK_k:
imv_viewport_move(&view, 0, 50);
break;
case SDLK_h:
imv_viewport_move(&view, 50, 0);
break;
case SDLK_l:
imv_viewport_move(&view, -50, 0);
break;
case SDLK_x:
imv_navigator_remove(&nav, imv_navigator_selection(&nav));
break;
case SDLK_f:
imv_viewport_toggle_fullscreen(&view);
break;
case SDLK_PERIOD:
imv_loader_load_next_frame(&ldr);
break;
case SDLK_SPACE:
imv_viewport_toggle_playing(&view);
break;
case SDLK_p:
puts(imv_navigator_selection(&nav));
break;
case SDLK_d:
g_options.overlay = !g_options.overlay;
need_redraw = 1;
break;
case SDLK_t:
if(e.key.keysym.mod & (KMOD_SHIFT|KMOD_CAPS)) {
if(g_options.delay >= 1000) {
g_options.delay -= 1000;
}
} else {
g_options.delay += 1000;
}
need_redraw = 1;
break;
}
break;
case SDL_MOUSEWHEEL:
imv_viewport_zoom(&view, &tex, IMV_ZOOM_MOUSE, e.wheel.y);
SDL_ShowCursor(SDL_ENABLE);
break;
case SDL_MOUSEMOTION:
if(e.motion.state & SDL_BUTTON_LMASK) {
imv_viewport_move(&view, e.motion.xrel, e.motion.yrel);
}
SDL_ShowCursor(SDL_ENABLE);
break;
case SDL_WINDOWEVENT:
imv_viewport_update(&view, &tex);
break;
}
}
/* if we're quitting, don't bother drawing any more images */
if(quit) {
break;
}
/* check if an image failed to load, if so, remove it from our image list */
char *err_path = imv_loader_get_error(&ldr);
if(err_path) {
imv_navigator_remove(&nav, err_path);
if (strncmp(err_path, "-", 2) == 0) {
free(stdin_buffer);
stdin_buffer_size = 0;
if (stdin_error != 0) {
errno = stdin_error;
perror("Failed to load image from standard input");
errno = 0;
}
}
free(err_path);
}
/* if the user has changed image, start loading the new one */
if(imv_navigator_poll_changed(&nav, poll_countdown--)) {
const char *current_path = imv_navigator_selection(&nav);
if(!current_path) {
if(g_options.stdin_list) {
continue;
}
fprintf(stderr, "No input files left. Exiting.\n");
exit(1);
}
char title[256];
snprintf(&title[0], sizeof(title), "imv - [%i/%i] [LOADING] %s [%s]",
nav.cur_path + 1, nav.num_paths, current_path,
scaling_label[g_options.scaling]);
imv_viewport_set_title(&view, title);
imv_loader_load(&ldr, current_path, stdin_buffer, stdin_buffer_size);
view.playing = 1;
}
/* get window height and width */
int ww, wh;
SDL_GetWindowSize(window, &ww, &wh);
/* check if a new image is available to display */
FIBITMAP *bmp;
int is_new_image;
if(imv_loader_get_image(&ldr, &bmp, &is_new_image)) {
imv_texture_set_image(&tex, bmp);
iw = FreeImage_GetWidth(bmp);
ih = FreeImage_GetWidth(bmp);
FreeImage_Unload(bmp);
need_redraw = 1;
need_rescale += is_new_image;
}
if(need_rescale) {
need_rescale = 0;
if(g_options.scaling == NONE ||
(g_options.scaling == DOWN && ww > iw && wh > ih)) {
imv_viewport_scale_to_actual(&view, &tex);
} else {
imv_viewport_scale_to_window(&view, &tex);
}
}
current_time = SDL_GetTicks();
/* if we're playing an animated gif, tell the loader how much time has
* passed */
if(view.playing) {
unsigned int dt = current_time - last_time;
imv_loader_time_passed(&ldr, dt / 1000.0);
}
/* handle slideshow */
if(g_options.delay) {
unsigned int dt = current_time - last_time;
delay_msec += dt;
need_redraw = 1;
if(delay_msec >= g_options.delay) {
if(!imv_navigator_select_rel(&nav, 1, g_options.cycle)) {
quit = 1;
}
delay_msec = 0;
}
}
last_time = current_time;
/* check if the viewport needs a redraw */
if(imv_viewport_needs_redraw(&view)) {
need_redraw = 1;
}
/* only redraw when something's changed */
if(need_redraw) {
/* update window title */
const char *current_path = imv_navigator_selection(&nav);
char title[256];
if(g_options.delay >= 1000) {
snprintf(&title[0], sizeof(title), "imv - [%i/%i] [%lu/%lus] [%ix%i] "
"%s [%s]", nav.cur_path + 1, nav.num_paths, delay_msec / 1000 + 1,
g_options.delay / 1000, tex.width, tex.height, current_path,
scaling_label[g_options.scaling]);
} else {
snprintf(&title[0], sizeof(title), "imv - [%i/%i] [%ix%i] %s [%s]",
nav.cur_path + 1, nav.num_paths, tex.width, tex.height,
current_path, scaling_label[g_options.scaling]);
}
imv_viewport_set_title(&view, title);
/* update the overlay */
if(font) {
if(g_options.delay >= 1000) {
snprintf(&title[0], sizeof(title), "[%i/%i] [%lu/%lus] %s [%s]",
nav.cur_path + 1, nav.num_paths, delay_msec / 1000 + 1,
g_options.delay / 1000, current_path,
scaling_label[g_options.scaling]);
} else {
snprintf(&title[0], sizeof(title), "[%i/%i] %s [%s]",
nav.cur_path + 1, nav.num_paths, current_path,
scaling_label[g_options.scaling]);
}
if(g_options.overlay_str) {
free(g_options.overlay_str);
}
g_options.overlay_str = strdup(title);
}
/* first we draw the background */
if(g_options.solid_bg) {
/* solid background */
SDL_SetRenderDrawColor(renderer,
g_options.bg_r, g_options.bg_g, g_options.bg_b, 255);
SDL_RenderClear(renderer);
} else {
/* chequered background */
int img_w, img_h;
SDL_QueryTexture(chequered_tex, NULL, NULL, &img_w, &img_h);
/* tile the texture so it fills the window */
for(int y = 0; y < wh; y += img_h) {
for(int x = 0; x < ww; x += img_w) {
SDL_Rect dst_rect = {x,y,img_w,img_h};
SDL_RenderCopy(renderer, chequered_tex, NULL, &dst_rect);
}
}
}
/* draw our actual texture */
imv_texture_draw(&tex, view.x, view.y, view.scale);
/* if the overlay needs to be drawn, draw that too */
if(g_options.overlay && font) {
SDL_Color fg = {255,255,255,255};
SDL_Color bg = {0,0,0,160};
imv_printf(renderer, font, 0, 0, &fg, &bg, "%s", g_options.overlay_str);
}
/* redraw complete, unset the flag */
need_redraw = 0;
/* reset poll countdown timer */
poll_countdown = UINT8_MAX;
/* tell SDL to show the newly drawn frame */
SDL_RenderPresent(renderer);
}
/* sleep a little bit so we don't waste CPU time */
if(g_options.stdin_list) {
if(poll(rfds, 1, 10) != 1 || rfds[0].revents & (POLLERR|POLLNVAL)) {
fprintf(stderr, "error polling stdin");
return 1;
}
if(rfds[0].revents & (POLLIN|POLLHUP)) {
char buf[PATH_MAX];
if(fgets(buf, sizeof(buf), stdin) == NULL && ferror(stdin)) {
clearerr(stdin);
continue;
}
if(feof(stdin)) {
g_options.stdin_list = 0;
fprintf(stderr, "done with stdin\n");
continue;
}
size_t len = strlen(buf);
if(buf[len-1] == '\n') {
buf[--len] = 0;
}
if(len > 0) {
imv_navigator_add(&nav, buf, g_options.recursive);
need_redraw = 1;
}
}
} else {
SDL_Delay(10);
}
}
while(g_options.list) {
const char *path = imv_navigator_selection(&nav);
if(!path) {
break;
}
fprintf(stdout, "%s\n", path);
imv_navigator_remove(&nav, path);
}
/* clean up our resources now that we're exiting */
imv_destroy_loader(&ldr);
imv_destroy_texture(&tex);
imv_navigator_destroy(&nav);
imv_destroy_viewport(&view);
if(font) {
TTF_CloseFont(font);
}
TTF_Quit();
if(chequered_tex) {
SDL_DestroyTexture(chequered_tex);
}
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}
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