1 /* sane - Scanner Access Now Easy.
2
3 Copyright (C) 2020 Thierry HUCHARD <thierry@ordissimo.com>
4
5 This file is part of the SANE package.
6
7 SANE is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3 of the License, or (at your
10 option) any later version.
11
12 SANE is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with sane; see the file COPYING.
19 If not, see <https://www.gnu.org/licenses/>.
20
21 This file implements a SANE backend for eSCL scanners. */
22
23 #define DEBUG_DECLARE_ONLY
24 #include "../include/sane/config.h"
25
26 #include "escl.h"
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30
31 unsigned char *
escl_crop_surface(capabilities_t *scanner, unsigned char *surface, int w, int h, int bps, int *width, int *height)32 escl_crop_surface(capabilities_t *scanner,
33 unsigned char *surface,
34 int w,
35 int h,
36 int bps,
37 int *width,
38 int *height)
39 {
40 double ratio = 1.0;
41 int x_off = 0, x = 0;
42 int real_w = 0;
43 int y_off = 0, y = 0;
44 int real_h = 0;
45 unsigned char *surface_crop = NULL;
46
47 DBG( 1, "Escl Image Crop\n");
48 ratio = (double)w / (double)scanner->caps[scanner->source].width;
49 scanner->caps[scanner->source].width = w;
50 if (scanner->caps[scanner->source].pos_x < 0)
51 scanner->caps[scanner->source].pos_x = 0;
52 if (scanner->caps[scanner->source].pos_x &&
53 (scanner->caps[scanner->source].width >
54 scanner->caps[scanner->source].pos_x))
55 x_off = (int)((double)scanner->caps[scanner->source].pos_x * ratio);
56 real_w = scanner->caps[scanner->source].width - x_off;
57
58 scanner->caps[scanner->source].height = h;
59 if (scanner->caps[scanner->source].pos_y &&
60 (scanner->caps[scanner->source].height >
61 scanner->caps[scanner->source].pos_y))
62 y_off = (int)((double)scanner->caps[scanner->source].pos_y * ratio);
63 real_h = scanner->caps[scanner->source].height - y_off;
64
65 DBG( 1, "Escl Image Crop [%dx%d|%dx%d]\n", scanner->caps[scanner->source].pos_x, scanner->caps[scanner->source].pos_y,
66 scanner->caps[scanner->source].width, scanner->caps[scanner->source].height);
67
68 *width = real_w;
69 *height = real_h;
70 DBG( 1, "Escl Image Crop [%dx%d]\n", *width, *height);
71 if (x_off > 0 || real_w < scanner->caps[scanner->source].width ||
72 y_off > 0 || real_h < scanner->caps[scanner->source].height) {
73 surface_crop = (unsigned char *)malloc (sizeof (unsigned char) * real_w
74 * real_h * bps);
75 if(!surface_crop) {
76 DBG( 1, "Escl Crop : Surface_crop Memory allocation problem\n");
77 free(surface);
78 surface = NULL;
79 goto finish;
80 }
81 for (y = 0; y < real_h; y++)
82 {
83 for (x = 0; x < real_w; x++)
84 {
85 surface_crop[(y * real_w * bps) + (x * bps)] =
86 surface[((y + y_off) * w * bps) + ((x + x_off) * bps)];
87 surface_crop[(y * real_w * bps) + (x * bps) + 1] =
88 surface[((y + y_off) * w * bps) + ((x + x_off) * bps) + 1];
89 surface_crop[(y * real_w * bps) + (x * bps) + 2] =
90 surface[((y + y_off) * w * bps) + ((x + x_off) * bps) + 2];
91 }
92 }
93 free(surface);
94 surface = surface_crop;
95 }
96 // we don't need row pointers anymore
97 scanner->img_data = surface;
98 scanner->img_size = (int)(real_w * real_h * bps);
99 scanner->img_read = 0;
100 finish:
101 return surface;
102 }
103