Import Ghostscript 9.50ghostscript-9.50

Signed-off-by: Thomas Deutschmann <whissi@gentoo.org>

1 files changed, 62 insertions, 0 deletions

diff --git a/base/gxiclass.h b/base/gxiclass.h
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+/* Copyright (C) 2001-2019 Artifex Software, Inc.
+   All Rights Reserved.
+
+   This software is provided AS-IS with no warranty, either express or
+   implied.
+
+   This software is distributed under license and may not be copied,
+   modified or distributed except as expressly authorized under the terms
+   of the license contained in the file LICENSE in this distribution.
+
+   Refer to licensing information at http://www.artifex.com or contact
+   Artifex Software, Inc.,  1305 Grant Avenue - Suite 200, Novato,
+   CA 94945, U.S.A., +1(415)492-9861, for further information.
+*/
+
+
+/* Define image rendering algorithm classes */
+
+#ifndef gxiclass_INCLUDED
+#  define gxiclass_INCLUDED
+
+#include "stdpre.h"
+#include "gsdevice.h"
+
+/* Define the abstract type for the image enumerator state. */
+typedef struct gx_image_enum_s gx_image_enum;
+
+/*
+ * Define the interface for routines used to render a (source) scan line.
+ * If the buffer is the original client's input data, it may be unaligned;
+ * otherwise, it will always be aligned.
+ *
+ * The image_render procedures work on fully expanded, complete rows.  These
+ * take a height argument, which is an integer >= 0; they return a negative
+ * code, or the number of rows actually processed (which may be less than
+ * the height).  height = 0 is a special call to indicate that there is no
+ * more input data; this is necessary because the last scan lines of the
+ * source data may not produce any output.
+ *
+ * Note that the 'w' argument of the image_render procedure is the number
+ * of samples, i.e., the number of pixels * the number of samples per pixel.
+ * This is neither the width in pixels nor the width in bytes (in the case
+ * of 12-bit samples, which expand to 2 bytes apiece).
+ */
+#define irender_proc(proc)\
+  int proc(gx_image_enum *penum, const byte *buffer, int data_x,\
+           uint w, int h, gx_device *dev)
+typedef irender_proc((*irender_proc_t));
+
+/*
+ * Define procedures for selecting imaging methods according to the class of
+ * the image.  Image class procedures are called in alphabetical order, so
+ * their names begin with a digit that indicates their priority
+ * (0_interpolate, etc.): each one may assume that all the previous ones
+ * failed.  If a class procedure succeeds, it may update the enumerator
+ * structure as well as returning the rendering procedure.
+ */
+#define iclass_proc(proc)\
+  int proc(gx_image_enum *penum, irender_proc_t *render_fn)
+typedef iclass_proc((*gx_image_class_t));
+
+#endif /* gxiclass_INCLUDED */