ImageData destructor fix

src/graphics/ImageData.cpp

@@ -1,5 +1,15 @@
 #include "ImageData.h"
 
+#include <assert.h>
+
+inline int min(int a, int b) {
+    return (a < b) ? a : b;
+}
+
+inline int max(int a, int b) {
+    return (a > b) ? a : b;
+}
+
 ImageData::ImageData(ImageFormat format, uint width, uint height, void* data) 
     : format(format), width(width), height(height), data(data) {
 }
@@ -8,7 +18,37 @@ ImageData::~ImageData() {
     switch (format) {
         case ImageFormat::rgb888:
         case ImageFormat::rgba8888:
-            delete[] data;
+            delete[] (ubyte*)data;
             break;
     }
+}
+
+ImageData* add_atlas_margins(ImageData* image, int grid_size) {
+    // RGBA is only supported
+    assert(image->getFormat() == ImageFormat::rgba8888);
+    assert(image->getWidth() == image->getHeight());
+
+    int srcwidth = image->getWidth();
+    int srcheight = image->getHeight();
+    int dstwidth = srcwidth + grid_size * 2;
+    int dstheight = srcheight + grid_size * 2;
+
+    const ubyte* srcdata = (const ubyte*)image->getData(); 
+    ubyte* dstdata = new ubyte[dstwidth*dstheight * 4];
+
+    int imgres = image->getWidth() / grid_size; 
+    for (int row = 0; row < grid_size; row++) {
+        for (int col = 0; col < grid_size; col++) {
+            int ox = 1 + col * (imgres + 2);
+            int oy = 1 + row * (imgres + 2);
+            for (int ly = -1; ly <= imgres; ly++) {
+                for (int lx = -1; lx <= imgres; lx++) {
+                    int sy = max(min(ly, imgres-1), 0);
+                    int sx = max(min(lx, imgres-1), 0);
+                    for (int c = 0; c < 4; c++)
+                        dstdata[((oy+ly) * dstwidth + ox + lx) * 4 + c] = srcdata[(sy * srcwidth + sx) * 4 + c];
+                }
+            }
+        }
+    }
 }