Bug 370034: Replace nsIDeviceContext::GetDeviceContextFor with nsIDeviceContext::Init. r+sr=roc

gfx/public/nsIDeviceContext.h

@@ -222,6 +222,13 @@ public:
    */
   NS_IMETHOD  Init(nsNativeWidget aWidget) = 0;
 
+  /**
+   * Initialize the device context from a device context spec
+   * @param aDevSpec the specification of the printng device (platform-specific)
+   * @return error status
+   */
+  NS_IMETHOD  InitForPrinting(nsIDeviceContextSpec* aDevSpec) = 0;
+
   /**
    * Create a rendering context and initialize it from an nsIView
    * @param aView view to initialize context from
@@ -393,19 +400,6 @@ public:
    */
   NS_IMETHOD GetClientRect(nsRect &aRect) = 0;
 
-  /**
-   * Returns a new nsIDeviceContext suitable for the device context
-   * specification passed in.
-   * @param aDevice a device context specification. this is a platform
-   *        specific structure that only a platform specific device
-   *        context can interpret.
-   * @param aContext out parameter for new device context. nsnull on
-   *        failure to create new device context.
-   * @return error status
-   */
-  NS_IMETHOD GetDeviceContextFor(nsIDeviceContextSpec *aDevice,
-                                 nsIDeviceContext *&aContext) = 0;
-
   /**
    * This is enables the DeviceContext to anything it needs to do for Printing
    * before Reflow and BeginDocument is where work can be done after reflow.

gfx/src/thebes/nsThebesDeviceContext.cpp

@@ -461,33 +461,22 @@ nsThebesDeviceContext::PrepareNativeWidget(nsIWidget* aWidget, void** aOut)
 
 
 /*
- * below methods are for printing and are not implemented
+ * below methods are for printing
  */
 NS_IMETHODIMP
-nsThebesDeviceContext::GetDeviceContextFor(nsIDeviceContextSpec *aDevice,
-                                           nsIDeviceContext *&aContext)
+nsThebesDeviceContext::InitForPrinting(nsIDeviceContextSpec *aDevice)
 {
-    nsThebesDeviceContext *newDevCon = new nsThebesDeviceContext();
+    NS_ENSURE_ARG_POINTER(aDevice);
 
-    if (newDevCon) {
-        // this will ref count it
-        nsresult rv = newDevCon->QueryInterface(NS_GET_IID(nsIDeviceContext), (void**)&aContext);
-        NS_ASSERTION(NS_SUCCEEDED(rv), "This has to support nsIDeviceContext");
-    } else {
-        return NS_ERROR_OUT_OF_MEMORY;
-    }
+    NS_ADDREF(mDeviceContextSpec = aDevice);
 
-    NS_ADDREF(aDevice);
+    mPrinter = PR_TRUE;
 
-    newDevCon->mDeviceContextSpec = aDevice;
+    aDevice->GetSurfaceForPrinter(getter_AddRefs(mPrintingSurface));
 
-    newDevCon->mPrinter = PR_TRUE;
+    Init(nsnull);
 
-    aDevice->GetSurfaceForPrinter(getter_AddRefs(newDevCon->mPrintingSurface));
-
-    newDevCon->Init(nsnull);
-
-    newDevCon->CalcPrintingSize();
+    CalcPrintingSize();
 
     return NS_OK;
 }

gfx/src/thebes/nsThebesDeviceContext.h

@@ -68,6 +68,7 @@ public:
     NS_DECL_ISUPPORTS_INHERITED
 
     NS_IMETHOD Init(nsNativeWidget aWidget);
+    NS_IMETHOD InitForPrinting(nsIDeviceContextSpec* aDevSpec);
     NS_IMETHOD CreateRenderingContext(nsIView *aView, nsIRenderingContext *&aContext);
 
     NS_IMETHOD CreateRenderingContext(nsIDrawingSurface *aSurface, nsIRenderingContext *&aContext);
@@ -93,9 +94,6 @@ public:
     NS_IMETHOD GetClientRect(nsRect &aRect);
 
     /* printing goop */
-    NS_IMETHOD GetDeviceContextFor(nsIDeviceContextSpec *aDevice,
-                                   nsIDeviceContext *&aContext);
-
     NS_IMETHOD PrepareDocument(PRUnichar * aTitle, 
                                PRUnichar*  aPrintToFileName);
 

layout/base/nsDocumentViewer.cpp

@@ -833,23 +833,18 @@ DocumentViewerImpl::InitInternal(nsIWidget* aParentWidget,
 
 #ifdef NS_PRINT_PREVIEW
       if (mIsPageMode) {
-        nsCOMPtr<nsIDeviceContext> devctx;
+        ;
         nsCOMPtr<nsIDeviceContextSpec> devspec =
-          do_CreateInstance("@mozilla.org/gfx/devicecontextspec;1");
-        // XXX CRASHES ON OOM. YUM. WOULD SOMEONE PLEASE FIX ME.
-        //     PERHAPS SOMEONE SHOULD HAVE REVIEWED THIS CODE.
-        // XXX I have no idea how critical this code is, so i'm not fixing it.
-        //     In fact I'm just adding a line that makes this block
-        //     get compiled *less* often.
+          do_CreateInstance("@mozilla.org/gfx/devicecontextspec;1", &rv);
+        NS_ENSURE_SUCCESS(rv, rv);
         // mWindow has been initialized by preceding call to MakeWindow
-        devspec->Init(mWindow, mPresContext->GetPrintSettings(), PR_FALSE);
-        // XXX CRASHES ON OOM under at least
-        // nsPrintJobFactoryPS::CreatePrintJob. WOULD SOMEONE PLEASE FIX ME.
-        //     PERHAPS SOMEONE SHOULD HAVE REVIEWED THIS CODE.
-        // XXX I have no idea how critical this code is, so i'm not fixing it.
-        //     In fact I'm just adding a line that makes this block
-        //     get compiled *less* often.
-        mDeviceContext->GetDeviceContextFor(devspec, *getter_AddRefs(devctx));
+        rv = devspec->Init(mWindow, mPresContext->GetPrintSettings(), PR_FALSE);
+        NS_ENSURE_SUCCESS(rv, rv);
+        nsCOMPtr<nsIDeviceContext> devctx =
+          do_CreateInstance("@mozilla.org/gfx/devicecontext;1", &rv);
+        NS_ENSURE_SUCCESS(rv, rv);
+        rv = devctx->Init(devspec);
+        NS_ENSURE_SUCCESS(rv, rv);
         // XXX I'm breaking this code; I'm not sure I really want to mess with
         // the document viewer at the moment to get the right device context
         // (this won't break anyone, since page layout mode was never really
@@ -4093,6 +4088,9 @@ DocumentViewerImpl::OnDonePrinting()
 
 NS_IMETHODIMP DocumentViewerImpl::SetPageMode(PRBool aPageMode, nsIPrintSettings* aPrintSettings)
 {
+  // XXX until the print code is in a more stable state, I don't
+  // want to worry about this code
+  return NS_ERROR_NOT_IMPLEMENTED;
   mIsPageMode = aPageMode;
   // Get the current size of what is being viewed
   nsRect bounds;

layout/printing/nsPrintEngine.cpp

@@ -641,8 +641,9 @@ nsPrintEngine::Print(nsIPrintSettings*       aPrintSettings,
     }
 
     if (NS_SUCCEEDED(rv)) {
-      rv = mDeviceContext->GetDeviceContextFor(devspec,
-                                               *getter_AddRefs(mPrt->mPrintDC));
+      mPrt->mPrintDC = do_CreateInstance("@mozilla.org/gfx/devicecontext;1", &rv);
+      if (NS_SUCCEEDED(rv))
+        rv = mPrt->mPrintDC->InitForPrinting(devspec);
       if (NS_SUCCEEDED(rv)) {
         if(webContainer) {
           // Always check and set the print settings first and then fall back
@@ -919,15 +920,15 @@ nsPrintEngine::PrintPreview(nsIPrintSettings* aPrintSettings,
   }
 #endif
 
-  nsCOMPtr<nsIDeviceContext> ppDC;
-  nsCOMPtr<nsIDeviceContextSpec> devspec =
-    do_CreateInstance("@mozilla.org/gfx/devicecontextspec;1");
-  if (devspec) {
-    rv = devspec->Init(mParentWidget, mPrt->mPrintSettings, PR_TRUE);
-    if (NS_SUCCEEDED(rv)) {
-      rv = mDeviceContext->GetDeviceContextFor(devspec, *getter_AddRefs(ppDC));
-    }
-  }
+  nsCOMPtr<nsIDeviceContextSpec> devspec
+    (do_CreateInstance("@mozilla.org/gfx/devicecontextspec;1", &rv));
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = devspec->Init(mParentWidget, mPrt->mPrintSettings, PR_TRUE);
+  NS_ENSURE_SUCCESS(rv, rv);
+  mPrt->mPrintDC = do_CreateInstance("@mozilla.org/gfx/devicecontext;1", &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = mPrt->mPrintDC->InitForPrinting(devspec);
+  NS_ENSURE_SUCCESS(rv, rv);
 
   mPrt->mPrintSettings->SetPrintFrameType(nsIPrintSettings::kFramesAsIs);
 
@@ -935,14 +936,6 @@ nsPrintEngine::PrintPreview(nsIPrintSettings* aPrintSettings,
   // we want to view every page in PrintPreview each time
   mPrt->mPrintSettings->SetPrintRange(nsIPrintSettings::kRangeAllPages);
 
-  if (ppDC)
-    mPrt->mPrintDC = ppDC;
-  else
-    mPrt->mPrintDC = mDeviceContext;
-
-  if (!mPrt->mPrintDC)
-    return NS_ERROR_FAILURE;
-
   if (aWebProgressListener != nsnull) {
     mPrt->mPrintProgressListeners.AppendObject(aWebProgressListener);
   }