Codebase update: Added transparency control to Image

common/image.cpp

@@ -29,6 +29,7 @@ SDL_Surface* Image::LoadSurface(std::string fname) {
 		throw(std::runtime_error(std::string() + "Failed to load file: " + fname));
 	}
 	surface = p;
+	SetTransparentColor(255, 0, 255); //default
 	clip = {0, 0, (Uint16)surface->w, (Uint16)surface->h};
 	local = true;
 	return surface;
@@ -60,3 +61,17 @@ void Image::DrawTo(SDL_Surface* dest, Sint16 x, Sint16 y) {
 	SDL_Rect sclip = clip, dclip = {x,y};
 	SDL_BlitSurface(surface, &sclip, dest, &dclip);
 }
+
+void Image::SetTransparentColor(Uint8 r, Uint8 g, Uint8 b) {
+	if (!surface) {
+		throw(std::logic_error("Failed to set the transparent color"));
+	}
+	SDL_SetColorKey(surface, SDL_SRCCOLORKEY, SDL_MapRGB(surface->format, r, g, b));
+}
+
+void Image::ClearTransparentColor() {
+	if (!surface) {
+		throw(std::logic_error("Failed to clear the transparent color"));
+	}
+	SDL_SetColorKey(surface, 0, 0);
+}

common/image.hpp

@@ -54,6 +54,9 @@ public:
 	Uint16 GetClipH() const { return clip.h; }
 
 	bool GetLocal() { return local; }
+
+	void SetTransparentColor(Uint8 r, Uint8 g, Uint8 b);
+	void ClearTransparentColor();
 protected:
 	SDL_Surface* surface = nullptr;
 	SDL_Rect clip = {0, 0, 0, 0};