added Image class to wrap SDL_Surface; changed Window to use Images

Image.cpp

@@ -0,0 +1,37 @@
+//
+// Image.cpp
+// libscgui
+//
+// Created by Bob Polis at 2020-10-23
+// Copyright (c) 2020 SwiftCoder. All rights reserved.
+//
+
+#include "Image.hpp"
+#include <SDL2/SDL_image.h>
+#include <stdexcept>
+
+using namespace sc::gui;
+
+Image::Image(int w, int h) {
+    Uint32 rmask, gmask, bmask, amask;
+#if SDL_BYTEORDER == SDL_BIG_ENDIAN
+    rmask = 0xff000000;
+    gmask = 0x00ff0000;
+    bmask = 0x0000ff00;
+    amask = 0x000000ff;
+#else
+    rmask = 0x000000ff;
+    gmask = 0x0000ff00;
+    bmask = 0x00ff0000;
+    amask = 0xff000000;
+#endif
+    SDL_Surface* s {SDL_CreateRGBSurface(0, w, h, 32, rmask, gmask, bmask, amask)};
+    _s.reset(s);
+}
+
+Image::Image(const std::string& path) {
+    // load image from file into surface
+    SDL_Surface* loaded = IMG_Load(path.c_str());
+    if (!loaded) throw std::runtime_error(IMG_GetError());
+    _s.reset(loaded);
+}

Image.hpp

@@ -0,0 +1,33 @@
+//
+// Image.hpp
+// libscgui
+//
+// Created by Bob Polis at 2020-10-23
+// Copyright (c) 2020 SwiftCoder. All rights reserved.
+//
+
+#ifndef _Image_H_
+#define _Image_H_
+
+#include <string>
+#include <memory>
+#include <SDL2/SDL.h>
+
+namespace sc {
+    namespace gui {
+        class Image {
+            public:
+                Image(int w, int h);
+                Image(const std::string& path);
+
+                SDL_Surface* surface() const { return _s.get(); }
+                int width() const { return _s.get()->w; }
+                int height() const { return _s.get()->h; }
+
+            private:
+                std::unique_ptr<SDL_Surface, void(*)(SDL_Surface*)> _s {nullptr, SDL_FreeSurface};
+        };
+    }
+}
+
+#endif // _Image_H_

Window.cpp

@@ -10,12 +10,18 @@
 #include <cmath>
 #include <algorithm>
 #include "Window.hpp"
+#include "Image.hpp"
 
 using namespace sc::gui;
 
 std::vector<Window> Window::_windows;
 std::map<SDL_WindowEventID, std::vector<WindowEventHandler>> Window::_global_event_handlers;
 
+Window& Window::new_window(const std::string& title) {
+    _windows.emplace_back(title);
+    return _windows.back();
+}
+
 Window* Window::from_sdl(Uint32 window_id) {
     SDL_Window* w {SDL_GetWindowFromID(window_id)};
     if (w) {
@@ -75,10 +81,10 @@ void Window::add_global_event_handler(WindowEventHandler handler, SDL_WindowEven
     }
 }
 
-Window::Window(const char* title) : _title {title} {
-    SDL_Window* win = SDL_CreateWindow(title,
+Window::Window(const std::string& title) : _title {title} {
+    SDL_Window* win = SDL_CreateWindow(title.c_str(),
                                        SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
-                                       900, 540,
+                                       800, 450,
                                        SDL_WINDOW_RESIZABLE);
     _w.reset(win);
     _r.reset(SDL_CreateRenderer(win, -1, 0));
@@ -94,23 +100,13 @@ void Window::update() const {
     SDL_RenderPresent(_r.get());
 }
 
-void Window::load_image() {
-    // load image from file into surface
-    SDL_Surface* loaded = IMG_Load(_title.c_str());
-    if (!loaded) throw std::runtime_error(IMG_GetError());
-    std::unique_ptr<SDL_Surface, void(*)(SDL_Surface*)> loaded_ {loaded, SDL_FreeSurface};
-
+void Window::show_image(const Image& image) {
     // create texture from surface
-    _t.reset(SDL_CreateTextureFromSurface(_r.get(), loaded));
-
-    // query texture for properties, like image size
-    Uint32 format;
-    int access;
-    int w, h;
-    int result = SDL_QueryTexture(_t.get(), &format, &access, &w, &h);
-    if (result != 0) throw std::runtime_error(SDL_GetError());
+    _t.reset(SDL_CreateTextureFromSurface(_r.get(), image.surface()));
 
     // get screen size, to scale down if image is too big
+    int w {image.width()};
+    int h {image.height()};
     SDL_DisplayMode dm;
     SDL_GetCurrentDisplayMode(0, &dm);
     if (dm.w < w || dm.h < h) {

Window.hpp

@@ -19,6 +19,7 @@
 namespace sc {
     namespace gui {
         using WindowEventHandler = bool(*)(const SDL_Event&, bool quit);
+        class Image;
 
         class Window {
             public:
@@ -27,17 +28,19 @@ namespace sc {
                 static bool handle_global_event(const SDL_Event& event);
                 static void add_global_event_handler(WindowEventHandler handler, SDL_WindowEventID type);
                 static Window* from_sdl(Uint32 window_id);
+                static Window& new_window(const std::string& title);
 
-                Window(const char* title);
+                Window(const std::string& title);
 
                 void add_event_handler(WindowEventHandler handler, SDL_WindowEventID type);
                 bool handle_event(const SDL_Event& event, bool quit);
 
                 SDL_Window* get_window() const { return _w.get(); }
+                SDL_Renderer* renderer() const { return _r.get(); }
                 void set_size(int w, int h);
 
                 void update() const;
-                void load_image();
+                void show_image(const Image& image);
 
             private:
                 static std::vector<Window> _windows;