Switch to Optional

Remove "valid" flag from Rect and Point, derive them directly from
SDL_Rect and SDL_Point structures, simplify logic. Now x/y/w/h member
variables are directly accessible and Rect/Point may be passed as
SDL_Rect/SDL_Point via pointer or reference.

Change all cases where Null Rects and Points were used to Optional.

invalid state related functions like Null(), IsNull() and Get() are
now deprecated but are not removed yet for compatibility sake.

SDL2pp/Point.cc

@@ -25,25 +25,22 @@
 
 namespace SDL2pp {
 
-Point::Point() : valid_(false) {
+Point::Point() {
+	x = 0;
+	y = 0;
 }
 
-Point::~Point() {
+Point::Point(int nx, int ny) {
+	x = nx;
+	y = ny;
 }
 
-Point::Point(int x, int y) : valid_(true) {
-	point_.x = x;
-	point_.y = y;
-}
-
-Point Point::Null() {
-	return Point();
+Optional<Point> Point::Null() {
+	return NullOpt;
 }
 
 bool Point::operator==(const Point& other) const {
-	if (!valid_ || !other.valid_)
-		return valid_ == other.valid_; // true only if both null
-	return point_.x == other.point_.x && point_.y == other.point_.y;
+	return x == other.x && y == other.y;
 }
 
 bool Point::operator!=(const Point& other) const {
@@ -51,67 +48,51 @@ bool Point::operator!=(const Point& other) const {
 }
 
 SDL_Point* Point::Get() {
-	return valid_ ? &point_ : nullptr;
+	return this;
 }
 
 const SDL_Point* Point::Get() const {
-	return valid_ ? &point_ : nullptr;
+	return this;
 }
 
 bool Point::IsNull() const {
-	return !valid_;
+	return false;
 }
 
 int Point::GetX() const {
-	assert(!IsNull());
-	return point_.x;
+	return x;
 }
 
-void Point::SetX(int x) {
-	assert(!IsNull());
-	point_.x = x;
+void Point::SetX(int nx) {
+	x = nx;
 }
 
 int Point::GetY() const {
-	assert(!IsNull());
-	return point_.y;
+	return y;
 }
 
-void Point::SetY(int y) {
-	assert(!IsNull());
-	point_.y = y;
+void Point::SetY(int ny) {
+	y = ny;
 }
 
 Point Point::operator+(const Point& other) const {
-	if (!valid_ || !other.valid_)
-		return Point();
-	return Point(point_.x + other.point_.x, point_.y + other.point_.y);
+	return Point(x + other.x, y + other.y);
 }
 
 Point Point::operator-(const Point& other) const {
-	if (!valid_ || !other.valid_)
-		return Point();
-	return Point(point_.x - other.point_.x, point_.y - other.point_.y);
+	return Point(x - other.x, y - other.y);
 }
 
 Point& Point::operator+=(const Point& other) {
-	if (!valid_ || !other.valid_) {
-		valid_ = false;
-	} else {
-		point_.x += other.point_.x;
-		point_.y += other.point_.y;
-	}
+	x += other.x;
+	y += other.y;
 
 	return *this;
 }
 
 Point& Point::operator-=(const Point& other) {
-	if (!valid_ || !other.valid_) {
-		valid_ = false;
-	} else {
-		point_.x -= other.point_.x;
-		point_.y -= other.point_.y;
-	}
+	x -= other.x;
+	y -= other.y;
 
 	return *this;
 }

SDL2pp/Point.hh

@@ -24,21 +24,16 @@
 
 #include <SDL2/SDL_rect.h>
 
+#include <SDL2pp/Optional.hh> // for deprecated functionality
+
 namespace SDL2pp {
 
-class Point {
-private:
-	SDL_Point point_;
-	bool valid_;
-
-private:
-	Point();
-
+class Point : public SDL_Point{
 public:
-	Point(int x, int y);
-	virtual ~Point();
+	Point();
+	Point(int nx, int ny);
 
-	static Point Null();
+	static Optional<Point> Null();
 
 	Point(const Point&) noexcept = default;
 	Point(Point&&) noexcept = default;
@@ -54,10 +49,10 @@ public:
 	bool IsNull() const;
 
 	int GetX() const;
-	void SetX(int x);
+	void SetX(int nx);
 
 	int GetY() const;
-	void SetY(int y);
+	void SetY(int ny);
 
 	Point operator+(const Point& other) const;
 	Point operator-(const Point& other) const;

SDL2pp/Rect.cc

@@ -27,28 +27,27 @@
 
 namespace SDL2pp {
 
-Rect::Rect() : valid_(false) {
+Rect::Rect() {
+	x = 0;
+	y = 0;
+	w = 0;
+	h = 0;
 }
 
-Rect::~Rect() {
+Rect::Rect(int nx, int ny, int nw, int nh) {
+	x = nx;
+	y = ny;
+	w = nw;
+	h = nh;
 }
 
-Rect::Rect(int x, int y, int w, int h) : valid_(true) {
-	rect_.x = x;
-	rect_.y = y;
-	rect_.w = w;
-	rect_.h = h;
-}
-
-Rect Rect::Null() {
-	return Rect();
+Optional<Rect> Rect::Null() {
+	return NullOpt;
 }
 
 bool Rect::operator==(const Rect& other) const {
-	if (!valid_ || !other.valid_)
-		return valid_ == other.valid_; // true only if both null
-	return rect_.x == other.rect_.x && rect_.y == other.rect_.y &&
-	       rect_.w == other.rect_.w && rect_.h == other.rect_.h;
+	return x == other.x && y == other.y &&
+	       w == other.w && h == other.h;
 }
 
 bool Rect::operator!=(const Rect& other) const {
@@ -56,11 +55,11 @@ bool Rect::operator!=(const Rect& other) const {
 }
 
 SDL_Rect* Rect::Get() {
-	return valid_ ? &rect_ : nullptr;
+	return this;
 }
 
 const SDL_Rect* Rect::Get() const {
-	return valid_ ? &rect_ : nullptr;
+	return this;
 }
 
 Rect Rect::FromCenter(int cx, int cy, int w, int h) {
@@ -68,101 +67,79 @@ Rect Rect::FromCenter(int cx, int cy, int w, int h) {
 }
 
 bool Rect::IsNull() const {
-	return !valid_;
+	return false;
 }
 
 int Rect::GetX() const {
-	assert(!IsNull());
-	return rect_.x;
+	return x;
 }
 
-void Rect::SetX(int x) {
-	assert(!IsNull());
-	rect_.x = x;
+void Rect::SetX(int nx) {
+	x = nx;
 }
 
 int Rect::GetY() const {
-	assert(!IsNull());
-	return rect_.y;
+	return y;
 }
 
-void Rect::SetY(int y) {
-	assert(!IsNull());
-	rect_.y = y;
+void Rect::SetY(int ny) {
+	y = ny;
 }
 
 int Rect::GetW() const {
-	assert(!IsNull());
-	return rect_.w;
+	return w;
 }
 
-void Rect::SetW(int w) {
-	assert(!IsNull());
-	rect_.w = w;
+void Rect::SetW(int nw) {
+	w = nw;
 }
 
 int Rect::GetH() const {
-	assert(!IsNull());
-	return rect_.h;
+	return h;
 }
 
-void Rect::SetH(int h) {
-	assert(!IsNull());
-	rect_.h = h;
+void Rect::SetH(int nh) {
+	h = nh;
 }
 
 int Rect::GetX2() const {
-	assert(!IsNull());
-	return rect_.x + rect_.w - 1;
+	return x + w - 1;
 }
 
 void Rect::SetX2(int x2) {
-	assert(!IsNull());
-	rect_.w = x2 - rect_.x + 1;
+	w = x2 - x + 1;
 }
 
 int Rect::GetY2() const {
-	assert(!IsNull());
-	return rect_.y + rect_.h - 1;
+	return y + h - 1;
 }
 
 void Rect::SetY2(int y2) {
-	assert(!IsNull());
-	rect_.h = y2 - rect_.y + 1;
+	h = y2 - y + 1;
 }
 
 bool Rect::Contains(const Point& point) const {
-	if (IsNull() || point.IsNull())
-		return false;
-	return !(point.GetX() < GetX() || point.GetY() < GetY() || point.GetX() > GetX2() || point.GetY() > GetY2());
+	return !(point.x < x || point.y < y || point.x > GetX2() || point.y > GetY2());
 }
 
 Rect Rect::operator+(const Point& offset) const {
-	assert(!IsNull() && !offset.IsNull());
-
-	return Rect(rect_.x + offset.GetX(), rect_.y + offset.GetY(), rect_.w, rect_.h);
+	return Rect(x + offset.x, y + offset.y, w, h);
 }
 
 Rect& Rect::operator+=(const Point& offset) {
-	assert(!IsNull() && !offset.IsNull());
-
-	rect_.x += offset.GetX();
-	rect_.y += offset.GetY();
+	x += offset.x;
+	y += offset.y;
 
 	return *this;
 }
 
 Rect Rect::operator-(const Point& offset) const {
-	assert(!IsNull() && !offset.IsNull());
-
-	return Rect(rect_.x - offset.GetX(), rect_.y - offset.GetY(), rect_.w, rect_.h);
+	return Rect(x - offset.x, y - offset.y, w, h);
 }
 
 Rect& Rect::operator-=(const Point& offset) {
-	assert(!IsNull() && !offset.IsNull());
-
-	rect_.x -= offset.GetX();
-	rect_.y -= offset.GetY();
+	x -= offset.x;
+	y -= offset.y;
 
 	return *this;
 }

SDL2pp/Rect.hh

@@ -24,25 +24,20 @@
 
 #include <SDL2/SDL_rect.h>
 
+#include <SDL2pp/Optional.hh> // for deprecated functionality
+
 struct SDL_Rect;
 
 namespace SDL2pp {
 
 class Point;
 
-class Rect {
-private:
-	SDL_Rect rect_;
-	bool valid_;
-
-private:
-	Rect();
-
+class Rect : public SDL_Rect {
 public:
+	Rect();
 	Rect(int x, int y, int w, int h);
-	virtual ~Rect();
 
-	static Rect Null();
+	static Optional<Rect> Null();
 
 	static Rect FromCenter(int cx, int cy, int w, int h);
 
@@ -54,6 +49,7 @@ public:
 	bool operator==(const Rect& other) const;
 	bool operator!=(const Rect& other) const;
 
+	// deprecated
 	SDL_Rect* Get();
 	const SDL_Rect* Get() const;
 

SDL2pp/Renderer.cc

@@ -27,8 +27,6 @@
 #include <SDL2pp/Window.hh>
 #include <SDL2pp/Exception.hh>
 #include <SDL2pp/Texture.hh>
-#include <SDL2pp/Rect.hh>
-#include <SDL2pp/Point.hh>
 
 namespace SDL2pp {
 
@@ -74,13 +72,13 @@ void Renderer::GetInfo(SDL_RendererInfo* info) {
 		throw Exception("SDL_GetRendererInfo failed");
 }
 
-void Renderer::Copy(Texture& texture, const Rect& srcrect, const Rect& dstrect) {
-	if (SDL_RenderCopy(renderer_, texture.Get(), srcrect.Get(), dstrect.Get()) != 0)
+void Renderer::Copy(Texture& texture, const Optional<Rect>& srcrect, const Optional<Rect>& dstrect) {
+	if (SDL_RenderCopy(renderer_, texture.Get(), srcrect ? &*srcrect : nullptr, dstrect ? &*dstrect : nullptr) != 0)
 		throw Exception("SDL_RenderCopy failed");
 }
 
-void Renderer::Copy(Texture& texture, const Rect& srcrect, const Rect& dstrect, double angle, const Point& center, int flip) {
-	if (SDL_RenderCopyEx(renderer_, texture.Get(), srcrect.Get(), dstrect.Get(), angle, center.Get(), static_cast<SDL_RendererFlip>(flip)) != 0)
+void Renderer::Copy(Texture& texture, const Optional<Rect>& srcrect, const Optional<Rect>& dstrect, double angle, const Optional<Point>& center, int flip) {
+	if (SDL_RenderCopyEx(renderer_, texture.Get(), srcrect ? &*srcrect : nullptr, dstrect ? &*dstrect : nullptr, angle, center ? &*center : nullptr, static_cast<SDL_RendererFlip>(flip)) != 0)
 		throw Exception("SDL_RenderCopyEx failed");
 }
 

SDL2pp/Renderer.hh

@@ -25,6 +25,7 @@
 #include <SDL2/SDL_stdinc.h>
 #include <SDL2/SDL_blendmode.h>
 
+#include <SDL2pp/Optional.hh>
 #include <SDL2pp/Point.hh>
 #include <SDL2pp/Rect.hh>
 
@@ -58,8 +59,8 @@ public:
 
 	void GetInfo(SDL_RendererInfo* info);
 
-	void Copy(Texture& texture, const Rect& srcrect = Rect::Null(), const Rect& dstrect = Rect::Null());
-	void Copy(Texture& texture, const Rect& srcrect, const Rect& dstrect, double angle, const Point& center = Point::Null(), int flip = 0);
+	void Copy(Texture& texture, const Optional<Rect>& srcrect = NullOpt, const Optional<Rect>& dstrect = NullOpt);
+	void Copy(Texture& texture, const Optional<Rect>& srcrect, const Optional<Rect>& dstrect, double angle, const Optional<Point>& center = NullOpt, int flip = 0);
 
 	void SetDrawColor(Uint8 r, Uint8 g, Uint8 b, Uint8 a = 255);
 	void SetTarget();

SDL2pp/Texture.cc

@@ -78,8 +78,8 @@ SDL_Texture* Texture::Get() const {
 	return texture_;
 }
 
-void Texture::Update(const Rect& rect, const void* pixels, int pitch) {
-	if (SDL_UpdateTexture(texture_, rect.Get(), pixels, pitch) != 0)
+void Texture::Update(const Optional<Rect>& rect, const void* pixels, int pitch) {
+	if (SDL_UpdateTexture(texture_, rect ? &*rect : nullptr, pixels, pitch) != 0)
 		throw Exception("SDL_UpdateTexture failed");
 }
 
@@ -98,7 +98,7 @@ void Texture::SetColorMod(Uint8 r, Uint8 g, Uint8 b) {
 		throw Exception("SDL_SetTextureColorMod failed");
 }
 
-Texture::LockHandle Texture::Lock(const Rect& rect = Rect::Null()) {
+Texture::LockHandle Texture::Lock(const Optional<Rect>& rect) {
 	return LockHandle(this, rect);
 }
 

SDL2pp/Texture.hh

@@ -27,6 +27,7 @@
 #include <SDL2/SDL_stdinc.h>
 #include <SDL2/SDL_blendmode.h>
 
+#include <SDL2pp/Optional.hh>
 #include <SDL2pp/Config.hh>
 
 struct SDL_Texture;
@@ -50,7 +51,7 @@ public:
 		int pitch_;
 
 	private:
-		LockHandle(Texture* texture, const Rect& rect);
+		LockHandle(Texture* texture, const Optional<Rect>& rect);
 
 	public:
 		LockHandle();
@@ -81,13 +82,13 @@ public:
 
 	SDL_Texture* Get() const;
 
-	void Update(const Rect& rect, const void* pixels, int pitch);
+	void Update(const Optional<Rect>& rect, const void* pixels, int pitch);
 
 	void SetBlendMode(SDL_BlendMode blendMode);
 	void SetAlphaMod(Uint8 alpha = 255);
 	void SetColorMod(Uint8 r = 255, Uint8 g = 255, Uint8 b = 255);
 
-	LockHandle Lock(const Rect& rect);
+	LockHandle Lock(const Optional<Rect>& rect);
 
 	Uint32 GetFormat() const;
 	int GetAccess() const;

SDL2pp/TextureLock.cc

@@ -31,8 +31,8 @@ namespace SDL2pp {
 Texture::LockHandle::LockHandle() : texture_(nullptr) {
 }
 
-Texture::LockHandle::LockHandle(Texture* texture, const Rect& rect) : texture_(texture) {
-	if (SDL_LockTexture(texture_->Get(), rect.Get(), &pixels_, &pitch_) != 0)
+Texture::LockHandle::LockHandle(Texture* texture, const Optional<Rect>& rect) : texture_(texture) {
+	if (SDL_LockTexture(texture_->Get(), rect ? &*rect : nullptr, &pixels_, &pitch_) != 0)
 		throw Exception("SDL_LockTexture failed");
 }
 

tests/test_pointrect.cc

@@ -10,32 +10,27 @@ BEGIN_TEST()
 		// Point basic ops
 		Point p(1,2);
 
-		EXPECT_TRUE(!p.IsNull());
 		EXPECT_TRUE(p.GetX() == 1 && p.GetY() == 2);
 		EXPECT_TRUE(p == Point(1,2));
 		EXPECT_TRUE(p != Point(1,1));
 		EXPECT_TRUE(p != Point(2,2));
-		EXPECT_TRUE(p != Point::Null());
-		EXPECT_TRUE(p.Get() != nullptr);
-		EXPECT_TRUE(p.Get()->x == 1 && p.Get()->y == 2);
+		EXPECT_TRUE(p.x == 1);
+		EXPECT_TRUE(p.y == 2);
 
 		p.SetX(4);
 		p.SetY(5);
 
 		EXPECT_TRUE(p.GetX() == 4 && p.GetY() == 5);
 		EXPECT_TRUE(p == Point(4,5));
+		EXPECT_TRUE(p.x == 4);
+		EXPECT_TRUE(p.y == 5);
 
 		p = Point(6,7);
 
 		EXPECT_TRUE(p.GetX() == 6 && p.GetY() == 7);
 		EXPECT_TRUE(p == Point(6,7));
-
-		p = Point::Null();
-
-		EXPECT_TRUE(p != Point(1,2));
-		EXPECT_TRUE(p == Point::Null());
-		EXPECT_TRUE(p.IsNull());
-		EXPECT_TRUE(p.Get() == nullptr);
+		EXPECT_TRUE(p.x == 6);
+		EXPECT_TRUE(p.y == 7);
 	}
 
 	{
@@ -71,35 +66,21 @@ BEGIN_TEST()
 
 		EXPECT_TRUE(sum.GetX() == 111 && sum.GetY() == 222);
 		EXPECT_TRUE(diff.GetX() == -111 && diff.GetY() == -222);
-
-		sum += Point::Null();
-		diff -= Point::Null();
-
-		EXPECT_TRUE(sum.IsNull());
-		EXPECT_TRUE(diff.IsNull());
-
-		EXPECT_TRUE((Point(1,1) + Point::Null()).IsNull());
-		EXPECT_TRUE((Point(1,1) - Point::Null()).IsNull());
-		EXPECT_TRUE((Point::Null() + Point(1,1)).IsNull());
-		EXPECT_TRUE((Point::Null() - Point(1,1)).IsNull());
-		EXPECT_TRUE((Point::Null() - Point::Null()).IsNull());
-		EXPECT_TRUE((Point::Null() - Point::Null()).IsNull());
 	}
 
 	{
 		// Rect basic ops
 		Rect r(1,2,3,4);
 
-		EXPECT_TRUE(!r.IsNull());
 		EXPECT_TRUE(r.GetX() == 1 && r.GetY() == 2 && r.GetW() == 3 && r.GetH() == 4);
 		EXPECT_TRUE(r == Rect(1,2,3,4));
 		EXPECT_TRUE(r != Rect(2,2,3,4));
 		EXPECT_TRUE(r != Rect(1,3,3,4));
 		EXPECT_TRUE(r != Rect(1,2,4,4));
 		EXPECT_TRUE(r != Rect(1,2,3,5));
-		EXPECT_TRUE(r != Rect::Null());
 		EXPECT_TRUE(r.Get() != nullptr);
 		EXPECT_TRUE(r.Get()->x == 1 && r.Get()->y == 2 && r.Get()->w == 3 && r.Get()->h == 4);
+		EXPECT_TRUE(r.x == 1 && r.y == 2 && r.w == 3 && r.h == 4);
 
 		r.SetX(5);
 		r.SetY(6);
@@ -108,18 +89,13 @@ BEGIN_TEST()
 
 		EXPECT_TRUE(r.GetX() == 5 && r.GetY() == 6 && r.GetW() == 7 && r.GetH() == 8);
 		EXPECT_TRUE(r == Rect(5,6,7,8));
+		EXPECT_TRUE(r.x == 5 && r.y == 6 && r.w == 7 && r.h == 8);
 
 		r = Rect(9,10,11,12);
 
 		EXPECT_TRUE(r.GetX() == 9 && r.GetY() == 10 && r.GetW() == 11 && r.GetH() == 12);
 		EXPECT_TRUE(r == Rect(9,10,11,12));
-
-		r = Rect::Null();
-
-		EXPECT_TRUE(r != Rect(1,2,3,4));
-		EXPECT_TRUE(r == Rect::Null());
-		EXPECT_TRUE(r.IsNull());
-		EXPECT_TRUE(r.Get() == nullptr);
+		EXPECT_TRUE(r.x == 9 && r.y == 10 && r.w == 11 && r.h == 12);
 	}
 
 	{