Support pixel density on p5.Image (fixes issue #6114)

src/core/p5.Renderer.js

@@ -158,10 +158,11 @@ class Renderer extends p5.Element {
     // get(x,y,w,h)
     }
 
-    const region = new p5.Image(w, h);
+    const region = new p5.Image(w*pd, h*pd);
+    region._pixelDensity = pd;
     region.canvas
       .getContext('2d')
-      .drawImage(canvas, x, y, w * pd, h * pd, 0, 0, w, h);
+      .drawImage(canvas, x, y, w * pd, h * pd, 0, 0, w*pd, h*pd);
 
     return region;
   }

src/image/p5.Image.js

@@ -220,6 +220,48 @@ p5.Image = class {
     this.pixels = [];
   }
 
+  /**
+ * Gets or sets the pixel density for high pixel density displays. By default,
+ * the density will be set to 1.
+ *
+ * Call this method with no arguments to get the default density, or pass
+ * in a number to set the density. If a non-positive number is provided,
+ * it defaults to 1.
+ *
+ * @method pixelDensity
+ * @param {Number} [density] A scaling factor for the number of pixels per
+ * side
+ * @returns {Number} The current density if called without arguments, or the instance for chaining if setting density.
+ */
+  pixelDensity(density) {
+    if (typeof density !== 'undefined') {
+    // Setter: set the density and handle resize
+      if (density <= 0) {
+        const errorObj = {
+          type: 'INVALID_VALUE',
+          format: { types: ['Number'] },
+          position: 1
+        };
+
+        p5._friendlyParamError(errorObj, 'pixelDensity');
+
+        // Default to 1 in case of an invalid value
+        density = 1;
+      }
+
+      this._pixelDensity = density;
+
+      // Adjust canvas dimensions based on pixel density
+      this.width /= density;
+      this.height /= density;
+
+      return this; // Return the image instance for chaining if needed
+    } else {
+    // Getter: return the default density
+      return this._pixelDensity;
+    }
+  }
+
   /**
    * Helper function for animating GIF-based images with time
    */