selective clearing

examples/HelloAnimation/main.cpp

@@ -6,7 +6,7 @@ using namespace Crafter;
 int main() {
     WindowWayland window(1280, 720, "Hello Input!");
 
-    RenderingElement element(
+    RenderingElementScaling element(
         true, //opaque, wether the element is opague or semi-transparant
         2,  //bufferWidth: the width of this elements pixel buffer
         1,  //bufferHeight: the height of this elements pixel buffer
@@ -21,6 +21,7 @@ int main() {
     );
 
     window.elements.push_back(&element);
+    element.buffer = {{255, 0, 0 ,255}, {0, 255, 0 ,255}};
     element.UpdatePosition(window);
 
     Animation<std::tuple<std::int_fast32_t>> anim({
@@ -39,7 +40,6 @@ int main() {
         window.LogTiming();
     });
     
-    element.buffer = {{255, 0, 0 ,255}, {0, 255, 0 ,255}};
 	window.StartUpdate();
     window.StartSync();
 }

implementations/Crafter.Graphics-RenderingElement.cpp

@@ -59,24 +59,36 @@ RenderingElementScaling::RenderingElementScaling(bool opaque, std::uint_fast32_t
 
 
 void RenderingElementPreScaled::UpdatePosition(Window& window) {
-    std::uint_fast32_t oldWidth = scaled.width;
+    ScaleData oldScale = scaled;
-    std::uint_fast32_t oldHeight = scaled.height;
     window.ScaleElement(*this);
-    if(oldWidth != scaled.width || oldHeight && scaled.height) {
+
+    if(oldScale.width != scaled.width || oldScale.height != scaled.height) {
         bufferScaled.resize(scaled.width * scaled.height);
+        window.AddDirtyRect(oldScale);
+        window.AddDirtyRect(scaled);
+    } else if(oldScale.x != scaled.x || oldScale.y != scaled.y) {
+        window.AddDirtyRect(oldScale);
+        window.AddDirtyRect(scaled);
     }
+    
     for(Transform* child : children) {
 		child->UpdatePosition(window, *this);
 	}
 }
 
 void RenderingElementPreScaled::UpdatePosition(Window& window, Transform& parent) {
-    std::uint_fast32_t oldWidth = scaled.width;
+    ScaleData oldScale = scaled;
-    std::uint_fast32_t oldHeight = scaled.height;
     window.ScaleElement(*this, parent);
-    if(oldWidth != scaled.width || oldHeight && scaled.height) {
+
+    if(oldScale.width != scaled.width || oldScale.height != scaled.height) {
         bufferScaled.resize(scaled.width * scaled.height);
+        window.AddDirtyRect(oldScale);
+        window.AddDirtyRect(scaled);
+    } else if(oldScale.x != scaled.x || oldScale.y != scaled.y) {
+        window.AddDirtyRect(oldScale);
+        window.AddDirtyRect(scaled);
     }
+    
     for(Transform* child : children) {
 		child->UpdatePosition(window, *this);
 	}
@@ -103,26 +115,39 @@ void RenderingElementScaling::CopyNearestNeighbour(Pixel_BU8_GU8_RU8_AU8* dst, s
 }
 
 void RenderingElementScaling::UpdatePosition(Window& window) {
-    std::uint_fast32_t oldWidth = scaled.width;
+    ScaleData oldScale = scaled;
-    std::uint_fast32_t oldHeight = scaled.height;
     window.ScaleElement(*this);
-    if(oldWidth != scaled.width || oldHeight && scaled.height) {
+
+    
+    if(oldScale.width != scaled.width || oldScale.height != scaled.height) {
         bufferScaled.resize(scaled.width * scaled.height);
         CopyNearestNeighbour(bufferScaled.data(), scaled.width, scaled.height);
+        window.AddDirtyRect(oldScale);
+        window.AddDirtyRect(scaled);
+    } else if(oldScale.x != scaled.x || oldScale.y != scaled.y) {
+        window.AddDirtyRect(oldScale);
+        window.AddDirtyRect(scaled);
     }
+
     for(Transform* child : children) {
 		child->UpdatePosition(window, *this);
 	}
 }
 
 void RenderingElementScaling::UpdatePosition(Window& window, Transform& parent) {
-    std::uint_fast32_t oldWidth = scaled.width;
+    ScaleData oldScale = scaled;
-    std::uint_fast32_t oldHeight = scaled.height;
     window.ScaleElement(*this, parent);
-    if(oldWidth != scaled.width || oldHeight && scaled.height) {
+
+    if(oldScale.width != scaled.width || oldScale.height != scaled.height) {
         bufferScaled.resize(scaled.width * scaled.height);
         CopyNearestNeighbour(bufferScaled.data(), scaled.width, scaled.height);
+        window.AddDirtyRect(oldScale);
+        window.AddDirtyRect(scaled);
+    } else if(oldScale.x != scaled.x || oldScale.y != scaled.y) {
+        window.AddDirtyRect(oldScale);
+        window.AddDirtyRect(scaled);
     }
+
     for(Transform* child : children) {
 		child->UpdatePosition(window, *this);
 	}

implementations/Crafter.Graphics-TextElement.cpp

@@ -34,7 +34,8 @@ TextElement::TextElement(std::int_fast32_t anchorX, std::int_fast32_t anchorY, s
 
 }
 
-void TextElement::RenderText(const std::string_view text, float size, Pixel_BU8_GU8_RU8_AU8 color, Font& font, TextAlignment alignment, VerticalTextAlignment verticalAlignment, TextOverflowMode overflowMode) {
+void TextElement::RenderText(Window& window, const std::string_view text, float size, Pixel_BU8_GU8_RU8_AU8 color, Font& font, TextAlignment alignment, VerticalTextAlignment verticalAlignment, TextOverflowMode overflowMode) {
+    window.AddDirtyRect(scaled);
     // Calculate the actual size needed for the text
     float scale = stbtt_ScaleForPixelHeight(&font.font, size);
     int baseline = (int)(font.ascent * scale);

implementations/Crafter.Graphics-Window.cpp

@@ -17,7 +17,6 @@ License along with this library; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
 */
 
-
 module Crafter.Graphics:Window_impl;
 import :Window;
 import :Transform;
@@ -25,7 +24,7 @@ import std;
 
 using namespace Crafter;
 
-Window::Window(std::uint_fast32_t width, std::uint_fast32_t height) : width(width), height(height) {
+Window::Window(std::int_fast32_t width, std::int_fast32_t height) : width(width), height(height) {
 
 }
 
@@ -98,3 +97,31 @@ void Window::LogTiming() {
     }
 }
 #endif
+
+bool Overlaps(const ScaleData& rect1, const ScaleData& rect2) {
+    return !(rect1.x + rect1.width <= rect2.x || rect2.x + rect2.width <= rect1.x || rect1.y + rect1.height <= rect2.y || rect2.y + rect2.height <= rect1.y);
+}
+
+ScaleData MergeRects(const ScaleData& rect1, const ScaleData& rect2) {
+    ScaleData merged;
+    merged.x = std::min(rect1.x, rect2.x);
+    merged.y = std::min(rect1.y, rect2.y);
+    merged.width = std::max(rect1.x + rect1.width, rect2.x + rect2.width) - merged.x;
+    merged.height = std::max(rect1.y + rect1.height, rect2.y + rect2.height) - merged.y;
+    return merged;
+}
+
+void Window::AddDirtyRect(ScaleData rect) {
+    bool merged = false;
+    for (auto& existingRect : dirtyRects) {
+        if (Overlaps(existingRect, rect)) {
+            existingRect = MergeRects(existingRect, rect);
+            merged = true;
+            break;
+        }
+    }
+    
+    if (!merged) {
+        dirtyRects.push_back(rect);
+    }
+}

implementations/Crafter.Graphics-Window_wayland.cpp

@@ -192,7 +192,6 @@ void WindowWayland::RenderElement(Transform* transform) {
 					
 					// Bounds check for source buffer
 					if (src_x >= 0 && src_x < static_cast<std::int_fast32_t>(src_width) && src_y >= 0 && src_y < static_cast<std::int_fast32_t>(src_height)) {
-
 						// Direct copy for opaque elements (skip blending)
 						framebuffer[y * width + x] = src_buffer[src_y * src_width + src_x];
 					}
@@ -232,15 +231,27 @@ void WindowWayland::Render() {
 	elements.erase(std::remove(elements.begin(), elements.end(), static_cast<Transform*>(nullptr)), elements.end());
 	std::sort(elements.begin(), elements.end(), [](Transform* a, Transform* b){ return a->z < b->z; });
 
-	// Clear screen efficiently using memset
+	if (!dirtyRects.empty()) {
-	memset(framebuffer, 0, width * height * sizeof(Pixel_BU8_GU8_RU8_AU8));
+		for (const ScaleData& rect : dirtyRects) {
+			for (std::int_fast32_t y = rect.y; y < rect.y + rect.height && y < height; y++) {
+				for (std::int_fast32_t x = rect.x; x < rect.x + rect.width && x < width; x++) {
+					framebuffer[y * width + x] = {0, 0, 0, 0};
+				}
+			}
+		}
 		
 		for(Transform* child : elements) {
 			RenderElement(child);
 		}
 		
+		for (const ScaleData& rect : dirtyRects) {
+			wl_surface_damage(surface, rect.x, rect.y, rect.width, rect.height);
+		}
+		dirtyRects.clear();
+	}
+
+
     wl_surface_attach(surface, buffer, 0, 0);
-	wl_surface_damage(surface, 0, 0, width, height);
 	wl_surface_commit(surface);
 }
 

interfaces/Crafter.Graphics-TextElement.cppm

@@ -46,6 +46,6 @@ export namespace Crafter {
         void RenderWrappedLine(const std::string_view line, float scale, int baseline, std::uint_fast32_t startY, Pixel_BU8_GU8_RU8_AU8 color, Font& font, TextAlignment alignment);
     public:
         TextElement(std::int_fast32_t anchorX = FractionalToMapped(0.5), std::int_fast32_t anchorY = FractionalToMapped(0.5), std::uint_fast32_t relativeWidth = FractionalToMapped(1), std::uint_fast32_t relativeHeight = FractionalToMapped(1), std::int_fast32_t anchorOffsetX = FractionalToMapped(0.5), std::int_fast32_t anchorOffsetY = FractionalToMapped(0.5), std::int_fast32_t z = 0, bool ignoreScaling = false);
-        void RenderText(const std::string_view text, float size, Pixel_BU8_GU8_RU8_AU8 pixel, Font& font, TextAlignment alignment = TextAlignment::Left, VerticalTextAlignment verticalAlignment = VerticalTextAlignment::Top, TextOverflowMode overflowMode = TextOverflowMode::Clip);
+        void RenderText(Window& window, const std::string_view text, float size, Pixel_BU8_GU8_RU8_AU8 pixel, Font& font, TextAlignment alignment = TextAlignment::Left, VerticalTextAlignment verticalAlignment = VerticalTextAlignment::Top, TextOverflowMode overflowMode = TextOverflowMode::Clip);
     };
 }

interfaces/Crafter.Graphics-Window.cppm

@@ -48,16 +48,20 @@ export namespace Crafter {
     class RenderingElement;
     class Window {
         public:
-        std::uint_fast32_t width; 
+        std::int_fast32_t width; 
-        std::uint_fast32_t height;
+        std::int_fast32_t height;
         std::chrono::time_point<std::chrono::high_resolution_clock> lastFrameBegin;
         std::vector<Transform*> elements;
         Event<void> onClose;
         Event<FrameTime> onUpdate;
         bool open = true;
         bool updating = false;
+        
+        std::vector<ScaleData> dirtyRects;
+        void AddDirtyRect(ScaleData rect);
+
         Window() = default;
-        Window(std::uint_fast32_t width, std::uint_fast32_t height);
+        Window(std::int_fast32_t width, std::int_fast32_t height);
         Window(Window&) = delete;
         Window(Window&&) = delete;
         virtual ~Window() = default;