From 9b91d6f3d0187e0daf29a262cf19ad08ba2b7cf5 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Fri, 26 Sep 2014 03:08:15 +0200
Subject: Add support for rotated sprites

---
 src/view/SpriteCache.cpp | 83 ++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 74 insertions(+), 9 deletions(-)

(limited to 'src/view/SpriteCache.cpp')

diff --git a/src/view/SpriteCache.cpp b/src/view/SpriteCache.cpp
index 82f669f..bd67346 100644
--- a/src/view/SpriteCache.cpp
+++ b/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());
+}
+
+SpriteCache::sprite_value SpriteCache::load(const std::string &id, unsigned rotation) {
+	if (!rotation)
+		return load(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());
 }
 
-SDL_Surface * SpriteCache::get(const std::string &type, const std::string &name) {
-	std::string id = type + "/" + name;
+SpriteCache::sprite_value & SpriteCache::get(const std::string &id, unsigned rotation) {
+	sprite_key key(id, rotation);
 
-	std::unique_ptr<SDL_Surface, SDL_Surface_deleter> &surface = sprites[id];
+	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;
+}
+
+SDL_Surface * SpriteCache::get(const std::string &type, const std::string &name, unsigned rotation) {
+	if (rotation >= 4)
+		return nullptr;
 
-	return surface.get();
+	return get(type + "/" + name, rotation).get();
 }
 
 
-- 
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