first commit

Makefile

@@ -0,0 +1,53 @@
+BIN := $(shell basename $$(pwd))
+
+MANSECTION := 1
+MANPAGE := $(BIN).$(MANSECTION)
+
+SRCS := $(wildcard *.cpp)
+OBJS := $(subst .cpp,.o,$(SRCS))
+DEPS := $(subst .cpp,.d,$(SRCS))
+
+CXX ?= g++
+PKG_CONFIG ?= pkg-config
+
+PREFIX ?= /usr/local
+BINDIR ?= $(PREFIX)/bin
+CONFIGDIR ?= $(PREFIX)/etc
+DATADIR ?= $(PREFIX)/share
+MANDIR ?= $(DATADIR)/man/man
+DOCDIR ?= $(DATADIR)/$(BIN)/doc
+
+RM := /bin/rm -f
+INSTALL := /usr/bin/install -c
+
+CXXFLAGS := $(CXXFLAGS) -Wshadow -Wall -Wpedantic -Wextra -g -fno-strict-aliasing -std=c++17 -pthread
+ifeq ($(DEBUG),1)
+	CXXFLAGS += -D DEBUG -O0
+else
+	CXXFLAGS += -D NDEBUG -O3
+endif
+
+LDLIBS := -lm -lpthread -lscgui -lSDL2 -lcairo
+
+.PHONY: all clean install
+
+all: $(BIN)
+
+$(BIN): $(OBJS) $(DEPS)
+	$(CXX) $(OBJS) $(LDFLAGS) $(LDLIBS) -o $(BIN)
+
+%.o: %.cpp %.d Makefile
+	$(CXX) $(CXXFLAGS) -MMD -MP -MT $@ -MF $*.d -c $<
+
+-include *.d
+
+%.d: ;
+
+clean:
+	$(RM) $(OBJS) $(DEPS) $(BIN)
+
+install: $(BIN)
+	$(INSTALL) -d $(BINDIR)
+	$(INSTALL) $(BIN) $(BINDIR)
+	$(INSTALL) -d $(MANDIR)$(MANSECTION)
+	$(INSTALL) $(MANPAGE) $(MANDIR)$(MANSECTION)

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;
+}

screensaver.1

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+.Dd $Mdocdate$
+.Dt screensaver 1
+.Os
+.Sh NAME
+.Nm screensaver
+.Nd one line about what it does
+.\" .Sh LIBRARY
+.\" For sections 2, 3, and 9	only.
+.\" Not used in OpenBSD.
+.Sh SYNOPSIS
+.Nm
+.Fl h | v
+.Nm
+.Op Ar
+.Sh DESCRIPTION
+The
+.Nm
+utility processes files ...
+When no file arguments are given,
+.Nm
+will read from the standard input.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl h, \-help
+Print help text and exit.
+.It Fl v, \-version
+Print version info and exit.
+.El
+.\" .Sh CONTEXT
+.\" For section 9 functions only.
+.\" .Sh IMPLEMENTATION NOTES
+.\" Not used in OpenBSD.
+.\" .Sh RETURN VALUES
+.\" For sections 2, 3, and 9 function return values only.
+.\" .Sh ENVIRONMENT
+.\" For sections 1, 6, 7, and 8 only.
+.\" .Sh FILES
+.Sh EXIT STATUS
+.\" For sections 1, 6, and 8 only.
+.Nm
+exits 0 on success, and 1 if an error occurs.
+.\" .Sh EXAMPLES
+.\" .Sh DIAGNOSTICS
+.\" For sections 1, 4, 6, 7, 8, and 9 printf/stderr messages only.
+.\" .Sh ERRORS
+.\" For sections 2, 3, 4, and 9 errno settings only.
+.\" .Sh SEE ALSO
+.\" .Xr foobar 1
+.\" .Sh STANDARDS
+.\" .Sh HISTORY
+.Sh AUTHORS
+Bob Polis
+.\" .Sh CAVEATS
+.\" .Sh BUGS
+.\" .Sh SECURITY CONSIDERATIONS
+.\" Not used in OpenBSD.