Initial import of the CDE 2.1.30 sources from the Open Group.

cde/lib/DtHelp/il/ilscaleint.h

@@ -0,0 +1,81 @@
+/* $XConsortium: ilscaleint.h /main/3 1995/10/23 16:00:23 rswiston $ */
+/**---------------------------------------------------------------------
+***	
+***    (c)Copyright 1991 Hewlett-Packard Co.
+***    
+***                             RESTRICTED RIGHTS LEGEND
+***    Use, duplication, or disclosure by the U.S. Government is subject to
+***    restrictions as set forth in sub-paragraph (c)(1)(ii) of the Rights in
+***    Technical Data and Computer Software clause in DFARS 252.227-7013.
+***                             Hewlett-Packard Company
+***                             3000 Hanover Street
+***                             Palo Alto, CA 94304 U.S.A.
+***    Rights for non-DOD U.S. Government Departments and Agencies are as set
+***    forth in FAR 52.227-19(c)(1,2).
+***
+***-------------------------------------------------------------------*/
+
+#ifndef ILSCALEINT_H
+#define ILSCALEINT_H
+
+     /* PRIVATE definitions shared between scaling code, e.g. /ilc/ilscale.c .
+        NO OTHER CODE SHOULD INCLUDE THIS FILE !
+     */
+
+
+        /*  In /ilc/ilbigray.c : */
+
+    /*  Called by ilScale().
+        Adds an element to "pipe" to scale the pipe image to "dstWidth" by "dstHeight"
+        which both must be > 0.  The input pipe image must be a bitonal,
+        bit-per-pixel image, with the given "blackIsZero".  "pInfo" points to the
+        pipe info, "dstWidth/Height" is the (> 0) size to scale to, and nGrayLevels
+        is the number of levels of gray.  The output image is a gray image.
+            Only a scale down in both directions is allowed; the following must be true:
+        srcWidth must be >= dstWidth and srcHeight must be >= dstHeight!
+    */
+IL_EXTERN void _ilScaleBitonalToGray (
+    ilPipe              pipe,
+    unsigned long       dstWidth,
+    unsigned long       dstHeight,
+    unsigned long       nGrayLevels,
+    ilBool              blackIsZero,
+    ilPipeInfo         *pInfo
+    );
+
+    /*  Called by ilScale().
+        Adds an element to "pipe" to scale the pipe image to "dstWidth" by "dstHeight"
+        which both must be > 0.  The input pipe image must be a bitonal,
+        bit-per-pixel image, with _any_ "blackIsZero".  The resulting image is of the 
+        same type. "pInfo" points to the pipe info, "dstWidth/Height" is the (> 0) size 
+        to scale to.
+            Only a scale down in both directions is allowed; the following must be true:
+        srcWidth must be >= dstWidth and srcHeight must be >= dstHeight!
+            Logically the same as ilScaleBitonalToGray(): a gray byte is produced for
+        each destination pixel, using 256 levels of gray.  If that byte is 
+        >= "*pGrayThreshold"; a white pixel is written; else a black pixel is written.
+            NOTE: the value at "*pGrayThreshold" is read each time the pipe is executed
+        (during Init()); the caller change its value and get different results without
+        recreating the pipe.  If "pGrayThreshold" is NULL, a default value is used.
+    */
+IL_EXTERN void _ilAreaScaleBitonal (
+    ilPipe              pipe,
+    unsigned long       dstWidth,
+    unsigned long       dstHeight,
+    int                *pGrayThreshold,
+    ilPipeInfo         *pInfo
+    );
+
+IL_EXTERN void _ilScaleSample (
+    ilPipe              pipe,
+    int                 Ncomponents,
+    unsigned long       dstWidth,
+    unsigned long       dstHeight,
+    unsigned long       nLevels,
+    ilBool              blackIsZero,
+    ilPipeInfo         *pInfo
+    );
+
+
+
+#endif