gdiplus: Add stub for GdipBitmapSetPixel.

dlls/gdiplus/gdiplus.spec

@@ -42,7 +42,7 @@
 @ stub GdipBitmapGetHistogramSize
 @ stdcall GdipBitmapGetPixel(ptr long long ptr)
 @ stdcall GdipBitmapLockBits(ptr ptr long long ptr)
-@ stub GdipBitmapSetPixel
+@ stdcall GdipBitmapSetPixel(ptr long long long)
 @ stdcall GdipBitmapSetResolution(ptr long long)
 @ stdcall GdipBitmapUnlockBits(ptr ptr)
 @ stdcall GdipClearPathMarkers(ptr)

dlls/gdiplus/image.c

@@ -87,6 +87,21 @@ GpStatus WINGDIPAPI GdipBitmapGetPixel(GpBitmap* bitmap, INT x, INT y,
     return NotImplemented;
 }
 
+GpStatus WINGDIPAPI GdipBitmapSetPixel(GpBitmap* bitmap, INT x, INT y,
+    ARGB color)
+{
+    static int calls;
+    TRACE("bitmap:%p, x:%d, y:%d, color:%08x\n", bitmap, x, y, color);
+
+    if(!bitmap)
+        return InvalidParameter;
+
+    if(!(calls++))
+        FIXME("not implemented\n");
+
+    return NotImplemented;
+}
+
 /* This function returns a pointer to an array of pixels that represents the
  * bitmap. The *entire* bitmap is locked according to the lock mode specified by
  * flags.  It is correct behavior that a user who calls this function with write