117 lines
4.4 KiB
C
117 lines
4.4 KiB
C
/*
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* Copyright (C) 2007 Daniel Drake <dsd@gentoo.org>
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* Copyright (C) 2015 Vasily Khoruzhick <anarsoul@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#pragma once
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#include <fprint.h>
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/**
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* fpi_frame:
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* @delta_x: X offset of the frame
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* @delta_y: Y offset of the frame
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* @data: bitmap
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*
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* #fpi_frame is used to store frames for swipe sensors. Drivers should
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* populate delta_x and delta_y if the device supports hardware movement
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* estimation.
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*/
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struct fpi_frame
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{
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int delta_x;
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int delta_y;
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unsigned char data[0];
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};
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/**
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* fpi_frame_asmbl_ctx:
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* @frame_width: width of the frame
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* @frame_height: height of the frame
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* @image_width: resulting image width
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* @get_pixel: pixel accessor, returns pixel brightness at x,y of frame
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*
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* #fpi_frame_asmbl_ctx is a structure holding the context for frame
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* assembling routines.
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*
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* Drivers should define their own #fpi_frame_asmbl_ctx depending on
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* hardware parameters of scanner. @image_width is usually 25% wider than
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* @frame_width to take horizontal movement into account.
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*/
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struct fpi_frame_asmbl_ctx
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{
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unsigned int frame_width;
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unsigned int frame_height;
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unsigned int image_width;
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unsigned char (*get_pixel)(struct fpi_frame_asmbl_ctx *ctx,
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struct fpi_frame *frame,
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unsigned int x,
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unsigned int y);
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};
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void fpi_do_movement_estimation (struct fpi_frame_asmbl_ctx *ctx,
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GSList *stripes);
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FpImage *fpi_assemble_frames (struct fpi_frame_asmbl_ctx *ctx,
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GSList *stripes);
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/**
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* fpi_line_asmbl_ctx:
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* @line_width: width of line
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* @max_height: maximal height of assembled image
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* @resolution: scale factor used for line assembling routines.
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* @median_filter_size: size of median filter for movement estimation
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* @max_search_offset: the number of lines to search for the next line
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* @get_deviation: pointer to a function that returns the numerical difference
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* between two lines
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* @get_pixel: pixel accessor, returns pixel brightness at x of line
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*
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* #fpi_line_asmbl_ctx is a structure holding the context for line assembling
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* routines.
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*
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* Drivers should define their own #fpi_line_asmbl_ctx depending on
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* the hardware parameters of the scanner. Swipe scanners of this type usually
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* return two lines, the second line is often narrower than first and is used
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* for movement estimation.
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*
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* The @max_search_offset value indicates how many lines forward the assembling
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* routines should look while searching for next line. This value depends on
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* how fast the hardware sends frames.
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*
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* The function pointed to by @get_deviation should return the numerical difference
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* between two lines. Higher values means lines are more different. If the reader
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* returns two lines at a time, this function should be used to estimate the
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* difference between pairs of lines.
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*/
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struct fpi_line_asmbl_ctx
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{
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unsigned int line_width;
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unsigned int max_height;
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unsigned int resolution;
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unsigned int median_filter_size;
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unsigned int max_search_offset;
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int (*get_deviation)(struct fpi_line_asmbl_ctx *ctx,
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GSList *line1,
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GSList *line2);
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unsigned char (*get_pixel)(struct fpi_line_asmbl_ctx *ctx,
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GSList *line,
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unsigned int x);
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};
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FpImage *fpi_assemble_lines (struct fpi_line_asmbl_ctx *ctx,
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GSList *lines,
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size_t num_lines);
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