Add support for rotated sprites

src/view/MapView.cpp

@@ -59,7 +59,7 @@ MapView::MapView(const std::shared_ptr<Window> &window0, const std::vector<std::
 			.h = 0,
 		};
 
-		SDL_Surface *sprite = spriteCache->get("tile", tileset[i]);
+		SDL_Surface *sprite = spriteCache->get("tile", tileset[i], 0);
 
 		SDL_SetSurfaceBlendMode(sprite, SDL_BLENDMODE_NONE);
 		SDL_BlitSurface(sprite, nullptr, surface, &rect);

src/view/SpriteCache.cpp

@@ -26,6 +26,8 @@
 
 #include "SpriteCache.hpp"
 
+#include <cstring>
+
 #include <SDL_image.h>
 
 
@@ -33,26 +35,89 @@ namespace RPGEdit {
 
 namespace View {
 
-std::unique_ptr<SDL_Surface, SpriteCache::SDL_Surface_deleter> SpriteCache::load(const std::string &name) {
-	std::string filename = "../resources/sprite/" + name + ".png";
+SpriteCache::sprite_value SpriteCache::load(const std::string &id) {
+	std::string filename = "../resources/sprite/" + id + ".png";
 
 	SDL_Surface *surface = IMG_Load(filename.c_str());
 
-	return std::unique_ptr<SDL_Surface, SDL_Surface_deleter>(surface, SDL_Surface_deleter());
+	return sprite_value(surface, SDL_Surface_deleter());
 }
 
-SDL_Surface * SpriteCache::get(const std::string &type, const std::string &name) {
-	std::string id = type + "/" + name;
+SpriteCache::sprite_value SpriteCache::load(const std::string &id, unsigned rotation) {
+	if (!rotation)
+		return load(id);
 
-	std::unique_ptr<SDL_Surface, SDL_Surface_deleter> &surface = sprites[id];
+	sprite_value &base = get(id, 0);
+	SDL_Surface *surface;
+
+	SDL_LockSurface(base.get());
+
+	int w = base->w, h = base->h, d = base->format->BytesPerPixel, w2, h2;
+
+	if (rotation == 2) {
+		w2 = w;
+		h2 = h;
+	}
+	else {
+		w2 = h;
+		h2 = w;
+	}
+
+	surface = SDL_CreateRGBSurface(0, w2, h2, base->format->BitsPerPixel,
+				       base->format->Rmask, base->format->Gmask, base->format->Bmask, base->format->Amask);
+
+	SDL_LockSurface(surface);
+
+	uint8_t *src = reinterpret_cast<uint8_t *>(base->pixels);
+	uint8_t *dst = reinterpret_cast<uint8_t *>(surface->pixels);
+
+	for (int x = 0; x < w; x++) {
+		for (int y = 0; y < h; y++) {
+			int x2, y2;
+
+			switch (rotation) {
+			case 1:
+				x2 = y;
+				y2 = w - x - 1;
+				break;
+			case 2:
+				x2 = w - x - 1;
+				y2 = h - y - 1;
+				break;
+			case 3:
+				x2 = h - y - 1;
+				y2 = x;
+			}
+
+			std::memcpy(dst + d * (y2*w2 + x2), src + d * (y*w + x), d);
+		}
+	}
+
+	SDL_UnlockSurface(surface);
+	SDL_UnlockSurface(base.get());
+
+	return sprite_value(surface, SDL_Surface_deleter());
+}
+
+SpriteCache::sprite_value & SpriteCache::get(const std::string &id, unsigned rotation) {
+	sprite_key key(id, rotation);
+
+	sprite_value &surface = sprites[key];
 
 	if (!surface)
-		surface = load(id);
+		surface = load(id, rotation);
 
 	if (!surface)
-		sprites.erase(sprites.find(id));
+		sprites.erase(sprites.find(key));
 
-	return surface.get();
+	return surface;
+}
+
+SDL_Surface * SpriteCache::get(const std::string &type, const std::string &name, unsigned rotation) {
+	if (rotation >= 4)
+		return nullptr;
+
+	return get(type + "/" + name, rotation).get();
 }
 
 

src/view/SpriteCache.hpp

@@ -27,6 +27,7 @@
 #pragma once
 
 #include <memory>
+#include <string>
 #include <unordered_map>
 
 #include <SDL.h>
@@ -38,19 +39,32 @@ namespace View {
 
 class SpriteCache {
 private:
-	class SDL_Surface_deleter {
-	public:
-		void operator()(SDL_Surface *surface) {
+	struct SDL_Surface_deleter {
+		void operator()(SDL_Surface *surface) const {
 			SDL_FreeSurface(surface);
 		}
 	};
 
-	std::unordered_map<std::string, std::unique_ptr<SDL_Surface, SDL_Surface_deleter>> sprites;
+	typedef std::pair<std::string, int> sprite_key;
+	typedef std::unique_ptr<SDL_Surface, SDL_Surface_deleter> sprite_value;
 
-	std::unique_ptr<SDL_Surface, SDL_Surface_deleter> load(const std::string &name);
+	struct sprite_key_hash {
+		size_t operator()(const sprite_key &k) const {
+			std::hash<std::string> string_hash;
+			std::hash<int> int_hash;
+
+			return string_hash(k.first) ^ int_hash(k.second);
+		}
+	};
+
+	std::unordered_map<sprite_key, sprite_value, sprite_key_hash> sprites;
+
+	sprite_value load(const std::string &id);
+	sprite_value load(const std::string &id, unsigned rotation);
+	sprite_value & get(const std::string &id, unsigned rotation);
 
 public:
-	SDL_Surface * get(const std::string &type, const std::string &name);
+	SDL_Surface * get(const std::string &type, const std::string &name, unsigned rotation = 0);
 
 	void clear() {
 		sprites.clear();