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git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@441 d0cd1f9f-072b-0410-8dd7-cf729c803f20
479 lines
14 KiB
C++
479 lines
14 KiB
C++
/**********************************************************************
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* File: img.h (Formerly image.h)
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* Description: Class definition for the IMAGE class.
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* Author: Ray Smith
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* Created: Thu Jun 07 13:42:37 BST 1990
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*
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* (C) Copyright 1990, Hewlett-Packard Ltd.
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*
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**********************************************************************/
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#ifndef IMG_H
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#define IMG_H
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#include "memry.h"
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struct Pix;
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/** 14inch * 400dpi */
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#define MAXIMAGEWIDTH (900*14)
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/** 14inch * 400dpi */
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#define MAXIMAGEHEIGHT (900*14)
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#define COMPUTE_IMAGE_XDIM(xsize,bpp) ((bpp)>8 ? ((xsize)*(bpp)+7)/8 :((xsize)+8/(bpp)-1)/(8/(bpp)))
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typedef inT8 (*IMAGE_OPENER) (int, inT32 *, inT32 *, inT8 *, inT8 *, inT32 *);
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typedef inT8 (*IMAGE_READER) (int, uinT8 *, inT32, inT32, inT8, inT32);
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typedef inT8 (*IMAGE_WRITER) (int, uinT8 *, inT32, inT32, inT8, inT8, inT32);
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/** array of colours */
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typedef uinT8 *COLOUR_PIX;
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enum COLOUR_PIX_NAME
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{
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RED_PIX,
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GREEN_PIX,
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BLUE_PIX
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};
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class DLLSYM IMAGELINE;
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/** encapsulated image */
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class DLLSYM IMAGE
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{
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public:
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IMAGE(); //constructor
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~IMAGE () { //destructor
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destroy(); //free memory
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}
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IMAGE & operator= ( //assignment
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IMAGE & source);
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/**
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* get file header
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* @param name name of image
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*/
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inT8 read_header(const char *name);
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/**
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* get rest of image
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* @param buflines size of buffer
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*/
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inT8 read(inT32 buflines);
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/**
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* write image
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* @param name name to write
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*/
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inT8 write(const char *name);
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/**
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* create blank image
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* @param x x size required
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* @param y y size required
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* @param bits_per_pixel bpp required
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*/
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inT8 create(inT32 x,
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inT32 y,
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inT8 bits_per_pixel);
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/**
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* capture raw image
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* @param pixels pixels to capture
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* @param x x size required
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* @param y y size required
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* @param bits_per_pixel bpp required
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*/
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inT8 capture(uinT8 *pixels,
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inT32 x,
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inT32 y,
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inT8 bits_per_pixel);
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/** destroy image */
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void destroy();
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/**
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* access function
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* @return xsize
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*/
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inT32 get_xsize() {
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return xsize;
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}
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/**
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* access function
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* @return ysize
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*/
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inT32 get_ysize() {
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return ysize;
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}
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/**
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* access function
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* @return bits per pixel
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*/
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inT8 get_bpp() {
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return bpp;
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}
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/**
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* access function
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* @return bits per sample
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*/
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inT8 get_bps() {
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return bps;
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}
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/** photo interp */
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BOOL8 white_high() {
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return photo_interp;
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}
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/** access function */
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uinT8 get_white_level() {
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return (1 << bpp) - 1;
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}
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/** get resolution */
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inT32 get_res() {
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return res;
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}
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/** set resolution */
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void set_res(inT32 resolution) {
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res = resolution;
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}
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uinT8 *get_buffer() {
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return image;
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}
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/**
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* access pixel
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* @param x coord
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* @param y coord
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*/
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uinT8 pixel(inT32 x,
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inT32 y);
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/**
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* get image line
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* @param x coord to start at
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* @param y line to get
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* @param width line to get
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* @param linebuf line to copy to
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*/
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void fast_get_line(inT32 x,
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inT32 y,
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inT32 width,
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IMAGELINE *linebuf);
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/**
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* get image line
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* @param x coord to start at
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* @param y line to get
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* @param width line to get
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* @param linebuf line to copy to
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* @param margins size of margins
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*/
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void get_line(inT32 x,
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inT32 y,
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inT32 width,
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IMAGELINE *linebuf,
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inT32 margins);
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/**
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* get image column
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* @param x coord to start at
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* @param y line to get
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* @param height number of pixels to get
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* @param linebuf line to copy to
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* @param margins size of margins
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*/
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void get_column(inT32 x,
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inT32 y,
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inT32 height,
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IMAGELINE *linebuf,
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inT32 margins);
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/**
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* put image line
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* @param x coord to start at
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* @param y line to put
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* @param width number of pixels to put
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* @param linebuf line to copy from
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*/
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void fast_put_line(inT32 x,
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inT32 y,
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inT32 width,
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IMAGELINE *linebuf);
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/**
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* put image line
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* @param x coord to start at
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* @param y line to put
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* @param width number of pixels to put
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* @param linebuf line to copy from
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* @param margins size of margins
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*/
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void put_line(inT32 x,
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inT32 y,
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inT32 width,
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IMAGELINE *linebuf,
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inT32 margins);
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/**
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* put image column
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* @param x coord to start at
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* @param y line to put
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* @param height number of pixels to put
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* @param linebuf line to copy to
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* @param margins size of margins
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*/
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void put_column(inT32 x,
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inT32 y,
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inT32 height,
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IMAGELINE *linebuf,
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inT32 margins);
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/**
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* check coordinates
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* @param x xcoord to check
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* @param y ycoord to check
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*/
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void check_legal_access(inT32 x,
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inT32 y,
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inT32 xext);
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/** Methods to convert image types. Only available if Leptonica is available. */
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Pix* ToPix();
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void FromPix(const Pix* src_pix);
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/**
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* Map function over window
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* @param win_width Window width
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* @param win_height Window height
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* @param convolve Conv function
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*/
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void convolver (
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inT32 win_width,
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inT32 win_height,
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void (*convolve) (
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uinT8 ** pixels, ///< Of window
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uinT8 bytespp, ///< 1 or 3 for colour
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inT32 win_wd, ///< Window width
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inT32 win_ht, ///< Window height
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uinT8 ret_white_value, ///< White value to RETURN
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uinT8 * result ///< Result pixel(s)
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));
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//copy rectangle
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friend DLLSYM void copy_sub_image(IMAGE *source, //source image
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inT32 xstart, //start coords
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inT32 ystart,
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inT32 xext, //extent to copy
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inT32 yext,
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IMAGE *dest, //destination image
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inT32 xdest, //destination coords //shift to match bpp
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inT32 ydest,
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BOOL8 adjust_grey);
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//enlarge rectangle
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friend DLLSYM void enlarge_sub_image(IMAGE *source, //source image
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inT32 xstart, //scaled coords
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inT32 ystart,
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IMAGE *dest, //destination image
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inT32 xdest, //destination coords
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inT32 ydest,
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inT32 xext, //extent to copy
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inT32 yext,
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inT32 scale, //scale factor
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BOOL8 adjust_grey); //shift to match bpp
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//reduce rectangle
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friend DLLSYM void fast_reduce_sub_image(IMAGE *source, //source image
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inT32 xstart, //start coords
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inT32 ystart,
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inT32 xext, //extent to copy
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inT32 yext,
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IMAGE *dest, //destination image
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inT32 xdest, //destination coords
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inT32 ydest,
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inT32 scale, //scale factor
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BOOL8 adjust_grey); //shift to match bpp
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//reduce rectangle
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friend DLLSYM void reduce_sub_image(IMAGE *source, //source image
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inT32 xstart, //start coords
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inT32 ystart,
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inT32 xext, //extent to copy
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inT32 yext,
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IMAGE *dest, //destination image
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inT32 xdest, //destination coords
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inT32 ydest,
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inT32 scale, //scale factor
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BOOL8 adjust_grey); //shift to match bpp
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private:
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inT8 bpp; ///< bits per pixel
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inT8 bps; ///< bits per sample
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inT8 bytespp; ///< per pixel
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inT8 lineskip; ///< waste bytes on line
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BOOL8 captured; ///< true if buffer captured
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inT8 photo_interp; ///< interpretation
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inT32 xsize, ysize; ///< size of image
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inT32 res; ///< resolution
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uinT8 *image; ///< the actual image
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inT32 xdim; ///< bytes per line
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inT32 bufheight; ///< height of buffer
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int fd; ///< open file descriptor
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IMAGE_READER reader; ///< reading function
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inT32 ymin; ///< bottom line in mem
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inT32 ymax; ///< top line in mem+1
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/**
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* read some more
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* @param y ycoord required
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*/
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inT8 bufread(inT32 y);
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};
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class DLLSYM IMAGELINE //one line of image
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{
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public:
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uinT8 * pixels; ///< image pixels
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inT8 bpp; ///< bits per pixel
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/** colour pixels */
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COLOUR_PIX operator[] (
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inT32 index) {
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return &pixels[index * 3]; //coercion access op
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}
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/** default constructor */
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IMAGELINE() {
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linewidth = 0;
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line = NULL;
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pixels = line;
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bpp = 8;
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}
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void init( //setup size
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inT32 width) { //size of line
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if (width <= 0)
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width = MAXIMAGEWIDTH;
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if (width > linewidth) {
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if (line != NULL)
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free_mem(line);
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linewidth = width;
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line = (uinT8 *) alloc_mem (linewidth * sizeof (uinT8));
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}
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pixels = line;
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bpp = 8;
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}
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~IMAGELINE () { //destructor
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if (line != NULL)
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free_mem(line);
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}
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/** For colour */
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void set_bpp(inT8 new_bpp) {
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if (new_bpp <= 8)
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bpp = 8;
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else
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bpp = 24;
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}
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void init() {
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if (line == NULL)
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init (0);
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else {
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pixels = line;
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bpp = 8;
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}
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}
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/**
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* copies a line
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* @param x coord to start at
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* @param y line to get
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* @param width no of pixels to get
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* @param linebuf line to copy to
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* @param margins size of margins
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*/
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friend void IMAGE::get_line(inT32 x,
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inT32 y,
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inT32 width,
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IMAGELINE *linebuf,
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inT32 margins);
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/**
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* copies a column
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* @param x coord to start at
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* @param y line to get
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* @param height no of pixels to get
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* @param linebuf line to copy to
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* @param margins size of margins
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*/
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friend void IMAGE::get_column(inT32 x,
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inT32 y,
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inT32 height,
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IMAGELINE *linebuf,
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inT32 margins);
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/**
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* writes a line
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* @param x coord to start at
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* @param y line to get
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* @param width no of pixels to put
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* @param linebuf line to copy to
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* @param margins size of margins
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*/
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friend void IMAGE::put_line(inT32 x,
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inT32 y,
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inT32 width,
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IMAGELINE *linebuf,
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inT32 margins);
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/**
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* writes a column
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* @param x coord to start at
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* @param y line to get
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* @param height no of pixels to put
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* @param linebuf line to copy to
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* @param margins size of margins
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*/
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friend void IMAGE::put_column(inT32 x,
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inT32 y,
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inT32 height,
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IMAGELINE *linebuf,
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inT32 margins);
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/**
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* @note may just change pointer
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* @param x coord to start at
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* @param y line to get
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* @param width no of pixels to get
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* @param linebuf line to copy to
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*/
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friend void IMAGE::fast_get_line(inT32 x,
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inT32 y,
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inT32 width,
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IMAGELINE *linebuf);
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/**
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* @note may just change pointer
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* @param x coord to start at
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* @param y line to get
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* @param width no of pixels to put
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* @param linebuf line to copy to
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*/
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friend void IMAGE::fast_put_line(inT32 x,
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inT32 y,
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inT32 width,
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IMAGELINE *linebuf);
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private:
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uinT8 * line; ///< local buffer
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inT32 linewidth; ///< width of buffer
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};
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#endif
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