diff --git a/demo/gdi/nuklear_gdi.h b/demo/gdi/nuklear_gdi.h
index ff2ff1964..776e8d01e 100644
--- a/demo/gdi/nuklear_gdi.h
+++ b/demo/gdi/nuklear_gdi.h
@@ -221,7 +221,7 @@ nk_gdi_set_vertexColor(PTRIVERTEX tri, struct nk_color col)
     tri->Red   = col.r << 8;
     tri->Green = col.g << 8;
     tri->Blue  = col.b << 8;
-    tri->Alpha = 0xff << 8;
+    tri->Alpha = col.a << 8;
 }
 
 static void
@@ -235,26 +235,26 @@ nk_gdi_rect_multi_color(HDC dc, short x, short y, unsigned short w,
     TRIVERTEX vt[4];
     alphaFunction.BlendOp = AC_SRC_OVER;
     alphaFunction.BlendFlags = 0;
-    alphaFunction.SourceConstantAlpha = 0;
+    alphaFunction.SourceConstantAlpha = 255;
     alphaFunction.AlphaFormat = AC_SRC_ALPHA;
 
     /* TODO: This Case Needs Repair.*/
     /* Top Left Corner */
-    vt[0].x     = x;
-    vt[0].y     = y;
+    vt[0].x     = 0;
+    vt[0].y     = 0;
     nk_gdi_set_vertexColor(&vt[0], left);
     /* Top Right Corner */
-    vt[1].x     = x+w;
-    vt[1].y     = y;
+    vt[1].x     = 0+w;
+    vt[1].y     = 0;
     nk_gdi_set_vertexColor(&vt[1], top);
     /* Bottom Left Corner */
-    vt[2].x     = x;
-    vt[2].y     = y+h;
+    vt[2].x     = 0;
+    vt[2].y     = 0+h;
     nk_gdi_set_vertexColor(&vt[2], right);
 
     /* Bottom Right Corner */
-    vt[3].x     = x+w;
-    vt[3].y     = y+h;
+    vt[3].x     = 0+w;
+    vt[3].y     = 0+h;
     nk_gdi_set_vertexColor(&vt[3], bottom);
 
     gTri[0].Vertex1 = 0;
@@ -263,9 +263,17 @@ nk_gdi_rect_multi_color(HDC dc, short x, short y, unsigned short w,
     gTri[1].Vertex1 = 2;
     gTri[1].Vertex2 = 1;
     gTri[1].Vertex3 = 3;
-    GdiGradientFill(dc, vt, 4, gTri, 2 , GRADIENT_FILL_TRIANGLE);
-    AlphaBlend(gdi.window_dc,  x, y, x+w, y+h,gdi.memory_dc, x, y, x+w, y+h,alphaFunction);
 
+    HDC memdc = CreateCompatibleDC(dc);
+    HBITMAP bitmap = CreateCompatibleBitmap(dc, w, h);
+    HGDIOBJ old = SelectObject(memdc, bitmap);
+
+    GdiGradientFill(memdc, vt, 4, gTri, 2 , GRADIENT_FILL_TRIANGLE);
+
+    GdiAlphaBlend(dc, x, y, w, h, memdc, 0, 0, w, h, alphaFunction);
+
+    DeleteDC(memdc);
+    DeleteObject(bitmap);
 }
 
 static BOOL
diff --git a/demo/gdip/nuklear_gdip.h b/demo/gdip/nuklear_gdip.h
index c0dd5dd41..294fab630 100644
--- a/demo/gdip/nuklear_gdip.h
+++ b/demo/gdip/nuklear_gdip.h
@@ -628,7 +628,7 @@ static void
 nk_gdip_draw_image(short x, short y, unsigned short w, unsigned short h,
     struct nk_image img, struct nk_color col)
 {
-    GpImage *image = img.handle.ptr;
+    GpImage *image = (GpImage *)img.handle.ptr;
     GdipDrawImageRectI(gdip.memory, image, x, y, w, h);
 }
 
@@ -675,7 +675,10 @@ nk_gdip_load_image_from_memory(const void *membuf, nk_uint membufSize)
         return nk_image_id(0);
     
     status = GdipLoadImageFromStream(stream, &image);
-    stream->lpVtbl->Release(stream);
+
+    /// TODO: 'IStream' {aka 'struct IStream'} has no member named 'lpVtbl'GCC
+    stream->Release();
+    //stream->lpVtbl->Release(stream);
 
     if (status)
         return nk_image_id(0);
@@ -688,7 +691,7 @@ nk_gdip_image_free(struct nk_image image)
 {
     if (!image.handle.ptr)
         return;
-    GdipDisposeImage(image.handle.ptr);
+    GdipDisposeImage((GpImage*)image.handle.ptr);
 }
 
 GdipFont*
diff --git a/nuklear.h b/nuklear.h
index bcb220e04..1ea76c719 100644
--- a/nuklear.h
+++ b/nuklear.h
@@ -374,7 +374,7 @@ extern "C" {
       #define NK_SIZE_TYPE unsigned __int32
     #elif defined(__GNUC__) || defined(__clang__)
       #if defined(__x86_64__) || defined(__ppc64__) || defined(__PPC64__) || defined(__aarch64__)
-        #define NK_SIZE_TYPE unsigned long
+        #define NK_SIZE_TYPE unsigned long long
       #else
         #define NK_SIZE_TYPE unsigned int
       #endif
@@ -389,7 +389,7 @@ extern "C" {
       #define NK_POINTER_TYPE unsigned __int32
     #elif defined(__GNUC__) || defined(__clang__)
       #if defined(__x86_64__) || defined(__ppc64__) || defined(__PPC64__) || defined(__aarch64__)
-        #define NK_POINTER_TYPE unsigned long
+        #define NK_POINTER_TYPE unsigned long long
       #else
         #define NK_POINTER_TYPE unsigned int
       #endif
@@ -29012,7 +29012,7 @@ nk_draw_color_picker(struct nk_command_buffer *o, const struct nk_rect *matrix,
 
     /* draw color matrix */
     temp = nk_hsv_f(hsva[0], 1.0f, 1.0f);
-    nk_fill_rect_multi_color(o, *matrix, white, temp, temp, white);
+    nk_fill_rect_multi_color(o, *matrix, white, temp, white, temp);
     nk_fill_rect_multi_color(o, *matrix, black_trans, black_trans, black, black);
 
     /* draw cross-hair */