[2/3] windowscodecs: Implement JpegDecoder_Frame_GetResolution.

[Vincent Povirk]

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From 7ab1f4cf794363ea8c864501e95ea7d43b2f8497 Mon Sep 17 00:00:00 2001
From: Vincent Povirk <vincent at codeweavers.com>
Date: Wed, 11 Apr 2012 17:22:43 -0500
Subject: [PATCH 2/3] windowscodecs: Implement
 JpegDecoder_Frame_GetResolution.

---
 dlls/windowscodecs/jpegformat.c |   23 +++++++++++++++++++++--
 1 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/dlls/windowscodecs/jpegformat.c b/dlls/windowscodecs/jpegformat.c
index d15dabf..53d7ec4 100644
--- a/dlls/windowscodecs/jpegformat.c
+++ b/dlls/windowscodecs/jpegformat.c
@@ -528,8 +528,27 @@ static HRESULT WINAPI JpegDecoder_Frame_GetPixelFormat(IWICBitmapFrameDecode *if
 static HRESULT WINAPI JpegDecoder_Frame_GetResolution(IWICBitmapFrameDecode *iface,
     double *pDpiX, double *pDpiY)
 {
-    FIXME("(%p,%p,%p): stub\n", iface, pDpiX, pDpiY);
-    return E_NOTIMPL;
+    JpegDecoder *This = impl_from_IWICBitmapFrameDecode(iface);
+
+    EnterCriticalSection(&This->lock);
+
+    if (This->cinfo.density_unit == 2) /* pixels per centimeter */
+    {
+        *pDpiX = This->cinfo.X_density * 2.54;
+        *pDpiY = This->cinfo.Y_density * 2.54;
+    }
+    else
+    {
+        /* 1 = pixels per inch, 0 = unknown */
+        *pDpiX = This->cinfo.X_density;
+        *pDpiY = This->cinfo.Y_density;
+    }
+
+    LeaveCriticalSection(&This->lock);
+
+    TRACE("(%p)->(%0.2f,%0.2f)\n", iface, *pDpiX, *pDpiY);
+
+    return S_OK;
 }
 
 static HRESULT WINAPI JpegDecoder_Frame_CopyPalette(IWICBitmapFrameDecode *iface,
-- 
1.7.9.1