Adding getter for mAlphaDepth to nsIImage.

Thanks to lordpixel@mac.com for the patch.
Bug #81353 r=pavlov sr=sfraser a=roc+moz

gfx/public/nsIImage.h

@@ -257,6 +257,13 @@ public:
    */
   virtual PRInt32 GetAlphaLevel() = 0;
 
+  /**
+   * Get the alpha depth for the image mask
+   * @update - lordpixel 2001/05/16
+   * @return  the alpha mask depth for the image, ie, 0, 1 or 8
+   */
+  virtual PRInt8 GetAlphaDepth() = 0;
+
   /**
    * Return information about the bits for this structure
    * @update - dwc 2/1/99

gfx/src/beos/nsImageBeOS.h

@@ -104,6 +104,12 @@ public:
 
   virtual void  SetAlphaLevel(PRInt32 aAlphaLevel);
   virtual PRInt32 GetAlphaLevel();
+  /**
+   * Get the alpha depth for the image mask
+   * @update - lordpixel 2001/05/16
+   * @return  the alpha mask depth for the image, ie, 0, 1 or 8
+   */
+  virtual PRInt8 GetAlphaDepth() {return(mAlphaDepth);}  
   virtual void  MoveAlphaMask(PRInt32 aX, PRInt32 aY);
 
   NS_IMETHOD   LockImagePixels(PRBool aMaskPixels);

gfx/src/gtk/nsImageGTK.h

@@ -105,6 +105,12 @@ public:
 
   virtual void  SetAlphaLevel(PRInt32 aAlphaLevel);
   virtual PRInt32 GetAlphaLevel();
+  /**
+   * Get the alpha depth for the image mask
+   * @update - lordpixel 2001/05/16
+   * @return  the alpha mask depth for the image, ie, 0, 1 or 8
+   */
+  virtual PRInt8 GetAlphaDepth() {return(mAlphaDepth);}  
   virtual void  MoveAlphaMask(PRInt32 aX, PRInt32 aY);
 
   NS_IMETHOD   LockImagePixels(PRBool aMaskPixels);

gfx/src/mac/nsImageMac.h

@@ -84,6 +84,14 @@ public:
                         PRInt32 aSXOffset, PRInt32 aSYOffset,
                         const nsRect &aTileRect);
 #ifdef USE_IMG2
+	
+   /**
+    * Get the alpha depth for the image mask
+    * @update - lordpixel 2001/05/16
+    * @return  the alpha mask depth for the image, ie, 0, 1 or 8
+    */
+    virtual PRInt8 GetAlphaDepth() {return(mAlphaDepth);}
+	
   NS_IMETHOD          DrawToImage(nsIImage* aDstImage, nscoord aDX, nscoord aDY,
                                   nscoord aDWidth, nscoord aDHeight);
 #endif

gfx/src/motif/nsImageMotif.h

@@ -110,6 +110,12 @@ public:
   PRInt32  CalcBytesSpan(PRUint32  aWidth);
   virtual void  SetAlphaLevel(PRInt32 /* aAlphaLevel */) {}
   virtual PRInt32 GetAlphaLevel() {return(0);}
+  /**
+   * Get the alpha depth for the image mask
+   * @update - lordpixel 2001/05/16
+   * @return  the alpha mask depth for the image, ie, 0, 1 or 8
+   */
+  virtual PRInt8 GetAlphaDepth() {return(mAlphaDepth);}  
   virtual void  MoveAlphaMask(PRInt32 /* aX */, PRInt32 /* aY */) {}
 
   NS_IMETHOD   LockImagePixels(PRBool aMaskPixels);

gfx/src/os2/nsImageOS2.h

@@ -127,6 +127,13 @@ public:
    */
   virtual PRInt32 GetAlphaLevel() {return(mAlphaLevel);}
 
+  /**
+   * Get the alpha depth for the image mask
+   * @update - lordpixel 2001/05/16
+   * @return  the alpha mask depth for the image, ie, 0, 1 or 8
+   */
+  virtual PRInt8 GetAlphaDepth() {return(mAlphaDepth);}
+
   /** 
    * Get the DIB specific informations for this bitmap.
    * @update dc - 10/29/98

gfx/src/photon/nsImagePh.h

@@ -85,6 +85,12 @@ public:
   
   virtual void  	  SetAlphaLevel(PRInt32 aAlphaLevel);
   virtual PRInt32 	  GetAlphaLevel();
+  /**
+   * Get the alpha depth for the image mask
+   * @update - lordpixel 2001/05/16
+   * @return  the alpha mask depth for the image, ie, 0, 1 or 8
+   */
+  virtual PRInt8 GetAlphaDepth() {return(mAlphaDepth);}  
   virtual void  	  MoveAlphaMask(PRInt32 aX, PRInt32 aY);
 
   NS_IMETHOD   		  LockImagePixels(PRBool aMaskPixels);

gfx/src/windows/nsImageWin.h

@@ -151,6 +151,13 @@ public:
    */
   virtual PRInt32 GetAlphaLevel() {return(mAlphaLevel);}
 
+  /**
+   * Get the alpha depth for the image mask
+   * @update - lordpixel 2001/05/16
+   * @return  the alpha mask depth for the image, ie, 0, 1 or 8
+   */
+  virtual PRInt8 GetAlphaDepth() {return(mAlphaDepth);}
+
   /** 
    * Get the DIB specific informations for this bitmap.
    * @update dc - 10/29/98

gfx/src/xlib/nsImageXlib.h

@@ -102,6 +102,12 @@ public:
 
   virtual void  SetAlphaLevel(PRInt32 aAlphaLevel);
   virtual PRInt32 GetAlphaLevel();
+  /**
+   * Get the alpha depth for the image mask
+   * @update - lordpixel 2001/05/16
+   * @return  the alpha mask depth for the image, ie, 0, 1 or 8
+   */
+  virtual PRInt8 GetAlphaDepth() {return(mAlphaDepth);}  
   virtual void  MoveAlphaMask(PRInt32 aX, PRInt32 aY);
 
   NS_IMETHOD   LockImagePixels(PRBool aMaskPixels);