From 3456e92a4015c7ece7b24c9db2bab6c3d7cd7dab Mon Sep 17 00:00:00 2001
From: Michael Ochmann <michael.ochmann@propeller.de>
Date: Wed, 22 Feb 2023 19:08:58 +0100
Subject: [PATCH] added border padding back to `massivedynamic::PixelRenderer`

---
 src/PixelRenderer.hpp | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/src/PixelRenderer.hpp b/src/PixelRenderer.hpp
index a25dc81..ec71b6a 100644
--- a/src/PixelRenderer.hpp
+++ b/src/PixelRenderer.hpp
@@ -12,23 +12,23 @@ namespace massivedynamic {
 
 	class PixelRenderer : public Renderer {
 		protected:
+		 	size_t pixelSize;
 			std::vector<Color> bitmap;
 
 			void drawPixelScaled(size_t x, size_t y, Color color) {
-				size_t pixelSize = floor(static_cast<float>(this->targetSize) / static_cast<float>(this->sourceSize + 2));
+				size_t pixelSize = this->pixelSize;
 
 				if (pixelSize < 1) {
 					std::cerr << "ERROR: output file size is too small" << std::endl;
 					exit(1);
 				}
 
-				size_t absoluteX = pixelSize * x;
-				size_t absoluteY = pixelSize * y;
+				size_t absoluteX = pixelSize * x + pixelSize;
+				size_t absoluteY = pixelSize * y + pixelSize;
 
-				for (size_t localY = absoluteY + pixelSize; localY < absoluteY + pixelSize + pixelSize; localY++) {
-					for (size_t localX = absoluteX + pixelSize; localX < absoluteX + pixelSize + pixelSize; localX++) {
-						size_t absPos = localY * this->targetSize + localX;
-						this->bitmap.at(absPos) = color;
+				for (size_t localY = absoluteY; localY < absoluteY + pixelSize; localY++) {
+					for (size_t localX = absoluteX; localX < absoluteX + pixelSize; localX++) {
+						this->bitmap.at(localY * this->targetSize + localX) = color;
 					}
 				}
 			}
@@ -38,9 +38,13 @@ namespace massivedynamic {
 				WHITE = 0xFFFFFFFF
 			};
 
-			PixelRenderer(const std::vector<bool>& pixels, size_t sourceSize, size_t targetSize) : Renderer(pixels, sourceSize, targetSize) {
-				if (this->targetSize == 0)
-					this->targetSize = (sourceSize + 2) * 2;
+			PixelRenderer(const std::vector<bool>& pixels, size_t sourceSize, size_t targetSize) : Renderer(pixels, sourceSize, targetSize), pixelSize(0) {
+				this->targetSize = this->targetSize == 0 ? (sourceSize + 2) * 2 : this->targetSize;
+
+				// here we make shure, `targetSize` will be a multiple of `sourceSize`	
+				this->pixelSize = round(static_cast<float>(this->targetSize) / static_cast<float>(this->sourceSize + 2));
+				this->targetSize = (this->sourceSize + 2) * this->pixelSize;
+
 				this->bitmap = std::vector<Color>(this->targetSize * this->targetSize, Colors::WHITE);
 			}