[8/9] windowscodecs: implement GetResolution for BMP decoder

[Vincent Povirk]

Vincent Povirk
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From 18c86a0ca23661ca1a317960859af580655a1142 Mon Sep 17 00:00:00 2001
From: Vincent Povirk <vincent at codeweavers.com>
Date: Wed, 24 Jun 2009 16:32:19 -0500
Subject: [PATCH 8/9] windowscodecs: implement GetResolution for BMP decoder

---
 dlls/windowscodecs/bmpdecode.c |   26 ++++++++++++++++++++++++--
 1 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/dlls/windowscodecs/bmpdecode.c b/dlls/windowscodecs/bmpdecode.c
index f30e316..c9c8bbe 100644
--- a/dlls/windowscodecs/bmpdecode.c
+++ b/dlls/windowscodecs/bmpdecode.c
@@ -155,11 +155,33 @@ static HRESULT WINAPI BmpFrameDecode_GetPixelFormat(IWICBitmapFrameDecode *iface
     return E_NOTIMPL;
 }
 
+static HRESULT BmpHeader_GetResolution(BITMAPV5HEADER *bih, double *pDpiX, double *pDpiY)
+{
+    switch (bih->bV5Size)
+    {
+    case sizeof(BITMAPCOREHEADER):
+        *pDpiX = 96.0;
+        *pDpiY = 96.0;
+        return S_OK;
+    case sizeof(BITMAPCOREHEADER2):
+    case sizeof(BITMAPINFOHEADER):
+    case sizeof(BITMAPV4HEADER):
+    case sizeof(BITMAPV5HEADER):
+        *pDpiX = bih->bV5XPelsPerMeter * 0.0254;
+        *pDpiY = bih->bV5YPelsPerMeter * 0.0254;
+        return S_OK;
+    default:
+        return E_FAIL;
+    }
+}
+
 static HRESULT WINAPI BmpFrameDecode_GetResolution(IWICBitmapFrameDecode *iface,
     double *pDpiX, double *pDpiY)
 {
-    FIXME("(%p,%p,%p): stub\n", iface, pDpiX, pDpiY);
-    return E_NOTIMPL;
+    BmpFrameDecode *This = (BmpFrameDecode*)iface;
+    TRACE("(%p,%p,%p)\n", iface, pDpiX, pDpiY);
+
+    return BmpHeader_GetResolution(&This->bih, pDpiX, pDpiY);
 }
 
 static HRESULT WINAPI BmpFrameDecode_CopyPalette(IWICBitmapFrameDecode *iface,
-- 
1.6.3.1