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/* Copyright (C) 2001-2012 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., 7 Mt. Lassen Drive - Suite A-134, San Rafael,
CA 94903, U.S.A., +1(415)492-9861, for further information.
*/
#ifndef gxdownscale_INCLUDED
#define gxdownscale_INCLUDED
#include "ctype_.h"
#include "gsmemory.h"
#include "gstypes.h"
#include "gxdevcli.h"
#include "gxgetbit.h"
/* The following structure definitions should really be considered
* private, and are exposed here only because it enables us to define
* gx_downscaler_t's on the stack, thus avoiding mallocs.
*/
typedef struct gx_downscaler_s gx_downscaler_t;
typedef void (gx_downscale_core)(gx_downscaler_t *ds,
byte *out_buffer,
byte *in_buffer,
int row,
int plane,
int span);
struct gx_downscaler_s {
gx_device *dev; /* Device */
int width; /* Width (pixels) */
int awidth; /* Adjusted width (pixels) */
int span; /* Num bytes in unscaled scanline */
int factor; /* Factor to downscale */
byte *mfs_data; /* MinFeatureSize data */
int src_bpc; /* Source bpc */
int *errors; /* Error diffusion table */
byte *data; /* Downscaling buffer */
byte *scaled_data;/* Downscaled data (only used for non
* integer downscales). */
int scaled_span;/* Num bytes in scaled scanline */
gx_downscale_core *down_core; /* Core downscaling function */
gs_get_bits_params_t params; /* Params if in planar mode */
int num_planes; /* Number of planes if planar, 0 otherwise */
};
/* To use the downscaler:
*
* + define a gx_downscaler_t on the stack.
* + initialise it with gx_downscaler_init or gx_downscaler_init_planar
* + repeatedly call gx_downscaler_get_lines (or
* gx_downscaler_copy_scan_lines) (for chunky mode) or
* gx_downscaler_get_bits_rectangle (for planar mode)
* + finalise with gx_downscaler_fin
*/
/* For chunky mode, currently only:
* src_bpc == 8 && dst_bpc == 1 && num_comps == 1
* src_bpc == 8 && dst_bpc == 8 && num_comps == 1
* src_bpc == 8 && dst_bpc == 8 && num_comps == 3
* src_bpc == 16 && dst_bpc == 16 && num_comps == 1
* are supported. mfs is ignored for all except the first of these.
* For planar mode, currently only:
* src_bpp == 8 && dst_bpp == 1
* src_bpp == 8 && dst_bpp == 8
* src_bpp == 16 && dst_bpp == 16
* are supported.
*/
int gx_downscaler_init(gx_downscaler_t *ds,
gx_device *dev,
int src_bpc,
int dst_bpc,
int num_comps,
int factor,
int mfs,
int (*adjust_width_proc)(int, int),
int adjust_width);
int gx_downscaler_init_planar(gx_downscaler_t *ds,
gx_device *dev,
gs_get_bits_params_t *params,
int num_comps,
int factor,
int mfs,
int src_bpc,
int dst_bpc);
int gx_downscaler_getbits(gx_downscaler_t *ds,
byte *out_data,
int row);
int gx_downscaler_get_bits_rectangle(gx_downscaler_t *ds,
gs_get_bits_params_t *params,
int row);
/* Must only fin a device that has been inited (though you can safely
* fin several times) */
void gx_downscaler_fin(gx_downscaler_t *ds);
/* A deliberate analogue to gdev_prn_copy_scan_lines, which despite being
* deprecated is still massively popular. */
int
gx_downscaler_copy_scan_lines(gx_downscaler_t *ds, int y,
byte *str, uint size);
int
gx_downscaler_scale(int width, int factor);
#endif
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