windowscodecs: Implement JpegEncoder_Frame_SetResolution.

dlls/windowscodecs/jpegformat.c

@@ -728,6 +728,7 @@ typedef struct JpegEncoder {
     int frame_initialized;
     int started_compress;
     UINT width, height;
+    double xres, yres;
     const jpeg_compress_format *format;
     IStream *stream;
     CRITICAL_SECTION lock;
@@ -874,8 +875,23 @@ static HRESULT WINAPI JpegEncoder_Frame_SetSize(IWICBitmapFrameEncode *iface,
 static HRESULT WINAPI JpegEncoder_Frame_SetResolution(IWICBitmapFrameEncode *iface,
     double dpiX, double dpiY)
 {
-    FIXME("(%p,%0.2f,%0.2f): stub\n", iface, dpiX, dpiY);
-    return E_NOTIMPL;
+    JpegEncoder *This = impl_from_IWICBitmapFrameEncode(iface);
+    TRACE("(%p,%0.2f,%0.2f)\n", iface, dpiX, dpiY);
+
+    EnterCriticalSection(&This->lock);
+
+    if (!This->frame_initialized || This->started_compress)
+    {
+        LeaveCriticalSection(&This->lock);
+        return WINCODEC_ERR_WRONGSTATE;
+    }
+
+    This->xres = dpiX;
+    This->yres = dpiY;
+
+    LeaveCriticalSection(&This->lock);
+
+    return S_OK;
 }
 
 static HRESULT WINAPI JpegEncoder_Frame_SetPixelFormat(IWICBitmapFrameEncode *iface,
@@ -1213,6 +1229,7 @@ HRESULT JpegEncoder_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
     This->frame_initialized = 0;
     This->started_compress = 0;
     This->width = This->height = 0;
+    This->xres = This->yres = 0.0;
     This->format = NULL;
     This->stream = NULL;
     InitializeCriticalSection(&This->lock);