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/* Copyright (C) 1998, 1999 Aladdin Enterprises. All rights reserved.
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This software is provided AS-IS with no warranty, either express or
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implied.
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This software is distributed under license and may not be copied,
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modified or distributed except as expressly authorized under the terms
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of the license contained in the file LICENSE in this distribution.
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For more information about licensing, please refer to
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http://www.ghostscript.com/licensing/. For information on
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commercial licensing, go to http://www.artifex.com/licensing/ or
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contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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*/
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/* $Id: gxmclip.h,v 1.5 2002/06/16 08:45:43 lpd Exp $ */
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/* Mask clipping device and interface */
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/* Requires gxdevice.h, gxdevmem.h */
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#ifndef gxmclip_INCLUDED
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# define gxmclip_INCLUDED
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#include "gxclip.h"
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/*
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* ImageType 3 images and Patterns that don't completely fill their
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* bounding box require the ability to clip against a mask.
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* The interface declared here doesn't take a position on whether
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* the mask will be used only in one position (ImageType 3) or in
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* multiple positions for tiling (Patterns).
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*
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* All the information in this file is logically private, but we must expose
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* the structure definition so that clients can allocate instances in the
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* stack frame.
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*/
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#define tile_clip_buffer_request 300
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#define tile_clip_buffer_size\
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((tile_clip_buffer_request / arch_sizeof_long) * arch_sizeof_long)
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typedef struct gx_device_mask_clip_s {
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gx_device_forward_common; /* target is set by client */
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gx_strip_bitmap tiles;
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gx_device_memory mdev; /* for tile buffer for copy_mono */
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gs_int_point phase; /* device space origin relative */
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/* to tile (backwards from gstate phase) */
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/* Ensure that the buffer is long-aligned. */
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union _b {
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byte bytes[tile_clip_buffer_size];
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ulong longs[tile_clip_buffer_size / arch_sizeof_long];
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} buffer;
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} gx_device_mask_clip;
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extern_st(st_device_mask_clip);
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#define public_st_device_mask_clip() /* in gxmclip.c */\
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gs_public_st_composite_use_final(st_device_mask_clip, gx_device_mask_clip,\
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"gx_device_mask_clip", device_mask_clip_enum_ptrs,\
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device_mask_clip_reloc_ptrs, gx_device_finalize)
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/*
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* Internal routine to initialize a mask clipping device.
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* We supply an explicit device space origin or phase.
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* Note that this procedure does not set cdev->tiles.
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*/
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int gx_mask_clip_initialize(gx_device_mask_clip * cdev,
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const gx_device_mask_clip * proto,
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const gx_bitmap * bits, gx_device * tdev,
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int tx, int ty, gs_memory_t *mem);
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/*
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* Prepare colors for a copy_mono operation.
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* The arguments of copy_mono are free variables:
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* dev, data, sourcex, raster, id, x, y, w, y, color0, color1.
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*/
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#define setup_mask_copy_mono(cdev, color, mcolor0, mcolor1)\
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BEGIN\
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if ( cdev->mdev.base == 0 ) {\
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/*\
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* The tile was too large for us to buffer even one scan line.\
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* Punt to the very, very slow default implementation of\
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* copy_mono.\
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*/\
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return gx_default_copy_mono(dev, data, sourcex, raster, id,\
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x, y, w, h, color0, color1);\
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}\
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if ( color1 != gx_no_color_index ) {\
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if ( color0 != gx_no_color_index ) {\
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/* Pre-fill with color0. */\
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code =\
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(*dev_proc(dev, fill_rectangle))(dev, x, y, w, h, color0);\
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if ( code < 0 )\
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return code;\
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}\
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color = color1;\
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mcolor0 = 0, mcolor1 = gx_no_color_index;\
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} else if ( color0 != gx_no_color_index ) {\
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color = color0;\
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mcolor0 = gx_no_color_index, mcolor1 = 0;\
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} else\
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return 0;\
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END
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#endif /* gxmclip_INCLUDED */
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