first commit

main.cpp

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+//
+// main.cpp
+// screensaver
+//
+// Created by Bob Polis at 2020-10-23
+// Copyright (c) 2020 SwiftCoder. All rights reserved.
+//
+
+#include <iostream>
+#include <cstdlib>
+#include <string>
+#include <stdexcept>
+#include <getopt.h>
+#include <libscgui.hpp>
+#include <unistd.h>
+#include <cairo/cairo.h>
+
+void print_help() {
+    std::cout << "usage: screensaver [-h|--version]\n";
+    std::cout << "  -h, --help    show this help text and exit\n";
+    std::cout << "  --version     show version number and exit\n";
+}
+
+void print_version() {
+    std::cout << "screensaver version 1.0\n";
+}
+
+void draw(sc::gui::Window& window) {
+    SDL_Surface* s {SDL_CreateRGBSurface(0, 700, 700, 32, 0x00ff0000, 0x0000ff00, 0x000000ff, 0)};
+    sc::gui::Image image {s};
+    SDL_FillRect(s, nullptr, SDL_MapRGB(s->format, 255, 255, 255));
+    SDL_Rect rect { 300, 300, 100, 100 };
+    SDL_FillRect(s, &rect, SDL_MapRGB(s->format, 255, 128, 0));
+    sc::gui::ImageLock lock {image};
+    cairo_surface_t* cs {cairo_image_surface_create_for_data(static_cast<unsigned char*>(s->pixels),
+                                                             CAIRO_FORMAT_RGB24, s->w, s->h, s->pitch)};
+    cairo_t* cr {cairo_create(cs)};
+    cairo_set_line_width(cr, 0.1);
+    cairo_set_source_rgb(cr, 0, 0, 0);
+    cairo_rectangle(cr, 200, 200, 100, 100);
+    cairo_fill(cr);
+    window.show_image(image);
+    cairo_surface_destroy(cs);
+    cairo_destroy(cr);
+}
+
+int main(int argc, const char * argv[]) {
+    try {
+        // RAII instances
+        sc::gui::SDLWrapper sdl2;
+        sc::gui::SDLImageWrapper sdl_image;
+
+        // main window
+        sc::gui::Window& window {sc::gui::Window::new_window("screensaver")};
+
+        int opt_char, opt_val;
+        struct option long_options[] = {
+            {"help", no_argument, nullptr, 'h'},
+            {"version", no_argument, &opt_val, 1},
+            {nullptr, 0, nullptr, 0}
+        };
+        while ((opt_char = getopt_long(argc, const_cast<char* const *>(argv), "h", long_options, nullptr)) != -1) {
+            std::string arg {optarg ? optarg : ""};
+            switch (opt_char) {
+                case 0: {
+                    // handle long-only options here
+                    switch (opt_val) {
+                        case 1:
+                            print_version();
+                            return EXIT_SUCCESS;
+                    }
+                    break;
+                }
+                case 'h':
+                    print_help();
+                    return EXIT_SUCCESS;
+                case '?':
+                    throw std::runtime_error("unrecognized option");
+            }
+        }
+        if (optind == argc) {
+            // here when no file args
+        }
+        for (int i = optind; i < argc; ++i) {
+            try {
+                // process file argv[i]
+            } catch (const std::runtime_error& ex) {
+                std::cerr << "screensaver: " << ex.what() << '\n';
+            }
+        }
+
+        draw(window);
+        sc::gui::app().run();
+
+    } catch (const std::exception& ex) {
+        std::cerr << "screensaver: " << ex.what() << '\n';
+        return EXIT_FAILURE;
+    }
+    return EXIT_SUCCESS;
+}