source: mainline/uspace/app/viewer/viewer.c@ c6f00b40

/*
 * Copyright (c) 2013 Martin Decky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup viewer
 * @{
 */
/** @file
 */

#include <stdio.h>
#include <stdlib.h>
#include <vfs/vfs.h>
#include <errno.h>
#include <stdlib.h>
#include <stdbool.h>
#include <window.h>
#include <canvas.h>
#include <draw/surface.h>
#include <draw/codec.h>
#include <task.h>
#include <str.h>

#define NAME  "viewer"

#define WINDOW_WIDTH   1024
#define WINDOW_HEIGHT  768

#define DECORATION_WIDTH        8
#define DECORATION_HEIGHT       28

static size_t imgs_count;
static size_t imgs_current = 0;
static char **imgs;

static window_t *main_window;
static surface_t *surface = NULL;
static canvas_t *canvas = NULL;

static surface_coord_t img_width;
static surface_coord_t img_height;

static bool img_load(const char *, surface_t **);
static bool img_setup(surface_t *);

static void on_keyboard_event(widget_t *widget, void *data)
{
        kbd_event_t *event = (kbd_event_t *) data;
        bool update = false;

        if ((event->type == KEY_PRESS) && (event->c == 'q'))
                exit(0);

        if ((event->type == KEY_PRESS) && (event->key == KC_PAGE_DOWN)) {
                if (imgs_current == imgs_count - 1)
                        imgs_current = 0;
                else
                        imgs_current++;

                update = true;
        }

        if ((event->type == KEY_PRESS) && (event->key == KC_PAGE_UP)) {
                if (imgs_current == 0)
                        imgs_current = imgs_count - 1;
                else
                        imgs_current--;

                update = true;
        }

        if (update) {
                surface_t *lsface;

                if (!img_load(imgs[imgs_current], &lsface)) {
                        printf("Cannot load image \"%s\".\n", imgs[imgs_current]);
                        exit(4);
                }
                if (!img_setup(lsface)) {
                        printf("Cannot setup image \"%s\".\n", imgs[imgs_current]);
                        exit(6);
                }
        }
}

static bool img_load(const char *fname, surface_t **p_local_surface)
{
        int fd;
        errno_t rc = vfs_lookup_open(fname, WALK_REGULAR, MODE_READ, &fd);
        if (rc != EOK)
                return false;

        vfs_stat_t stat;
        rc = vfs_stat(fd, &stat);
        if (rc != EOK) {
                vfs_put(fd);
                return false;
        }

        void *tga = malloc(stat.size);
        if (tga == NULL) {
                vfs_put(fd);
                return false;
        }

        size_t nread;
        rc = vfs_read(fd, (aoff64_t []) { 0 }, tga, stat.size, &nread);
        if (rc != EOK || nread != stat.size) {
                free(tga);
                vfs_put(fd);
                return false;
        }

        vfs_put(fd);

        *p_local_surface = decode_tga(tga, stat.size, 0);
        if (*p_local_surface == NULL) {
                free(tga);
                return false;
        }

        free(tga);

        surface_get_resolution(*p_local_surface, &img_width, &img_height);

        return true;
}

static bool img_setup(surface_t *local_surface)
{
        if (canvas != NULL) {
                if (!update_canvas(canvas, local_surface)) {
                        surface_destroy(local_surface);
                        return false;
                }
        } else {
                canvas = create_canvas(window_root(main_window), NULL,
                    img_width, img_height, local_surface);
                if (canvas == NULL) {
                        surface_destroy(local_surface);
                        return false;
                }

                sig_connect(&canvas->keyboard_event, NULL, on_keyboard_event);
        }

        if (surface != NULL)
                surface_destroy(surface);

        surface = local_surface;
        return true;
}

static void print_syntax(void)
{
        printf("Syntax: %s [-d <display>] <image-file>...\n", NAME);
}

int main(int argc, char *argv[])
{
        const char *display_svc = DISPLAY_DEFAULT;
        window_flags_t flags;
        surface_t *lsface;
        bool fullscreen;
        sysarg_t dwidth;
        sysarg_t dheight;
        int i;

        i = 1;
        while (i < argc && argv[i][0] == '-') {
                if (str_cmp(argv[i], "-d") == 0) {
                        ++i;
                        if (i >= argc) {
                                printf("Argument missing.\n");
                                print_syntax();
                                return 1;
                        }

                        display_svc = argv[i++];
                } else {
                        printf("Invalid option '%s'.\n", argv[i]);
                        print_syntax();
                        return 1;
                }
        }

        if (i >= argc) {
                printf("No image files specified.\n");
                print_syntax();
                return 1;
        }

        imgs_count = argc - i;
        imgs = calloc(imgs_count, sizeof(char *));
        if (imgs == NULL) {
                printf("Out of memory.\n");
                return 2;
        }

        for (int j = 0; j < argc - i; j++) {
                imgs[j] = str_dup(argv[i + j]);
                if (imgs[j] == NULL) {
                        printf("Out of memory.\n");
                        return 3;
                }
        }

        if (!img_load(imgs[imgs_current], &lsface)) {
                printf("Cannot load image \"%s\".\n", imgs[imgs_current]);
                return 4;
        }

        fullscreen = ((img_width == WINDOW_WIDTH) &&
            (img_height == WINDOW_HEIGHT));

        flags = WINDOW_MAIN;
        if (!fullscreen)
                flags |= WINDOW_DECORATED;

        main_window = window_open(display_svc, NULL, flags, "viewer");
        if (!main_window) {
                printf("Cannot open main window.\n");
                return 5;
        }

        if (!img_setup(lsface)) {
                printf("Cannot setup image \"%s\".\n", imgs[imgs_current]);
                return 6;
        }

        if (!fullscreen) {
                dwidth = DECORATION_WIDTH;
                dheight = DECORATION_HEIGHT;
        } else {
                dwidth = 0;
                dheight = 0;
        }

        window_resize(main_window, 0, 0, img_width + dwidth,
            img_height + dheight, WINDOW_PLACEMENT_ANY);
        window_exec(main_window);

        task_retval(0);
        async_manager();

        return 0;
}

/** @}
 */