1 /*
2     Copyright (c) 2005-2021 Intel Corporation
3 
4     Licensed under the Apache License, Version 2.0 (the "License");
5     you may not use this file except in compliance with the License.
6     You may obtain a copy of the License at
7 
8         http://www.apache.org/licenses/LICENSE-2.0
9 
10     Unless required by applicable law or agreed to in writing, software
11     distributed under the License is distributed on an "AS IS" BASIS,
12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13     See the License for the specific language governing permissions and
14     limitations under the License.
15 */
16 
17 /*
18     The original source for this example is
19     Copyright (c) 1994-2008 John E. Stone
20     All rights reserved.
21 
22     Redistribution and use in source and binary forms, with or without
23     modification, are permitted provided that the following conditions
24     are met:
25     1. Redistributions of source code must retain the above copyright
26        notice, this list of conditions and the following disclaimer.
27     2. Redistributions in binary form must reproduce the above copyright
28        notice, this list of conditions and the following disclaimer in the
29        documentation and/or other materials provided with the distribution.
30     3. The name of the author may not be used to endorse or promote products
31        derived from this software without specific prior written permission.
32 
33     THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
34     OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
35     WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
36     ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
37     DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
38     DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
39     OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
41     LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
42     OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
43     SUCH DAMAGE.
44 */
45 
46 /*
47  * imap.cpp - This file contains code for doing image map type things.
48  */
49 
50 #include "machine.hpp"
51 #include "types.hpp"
52 #include "imap.hpp"
53 #include "util.hpp"
54 #include "imageio.hpp"
55 
56 rawimage *imagelist[MAXIMGS];
57 int numimages;
58 
ResetImages(void)59 void ResetImages(void) {
60     int i;
61     numimages = 0;
62     for (i = 0; i < MAXIMGS; i++) {
63         imagelist[i] = nullptr;
64     }
65 }
66 
LoadImage(rawimage * image)67 void LoadImage(rawimage *image) {
68     if (!image->loaded) {
69         readimage(image);
70         image->loaded = 1;
71     }
72 }
73 
ImageMap(rawimage * image,flt u,flt v)74 color ImageMap(rawimage *image, flt u, flt v) {
75     color col, colx, colx2;
76     flt x, y, px, py;
77     int x1, x2, y1, y2;
78     unsigned char *ptr;
79     unsigned char *ptr2;
80 
81     if (!image->loaded) {
82         LoadImage(image);
83         image->loaded = 1;
84     }
85 
86     if ((u <= 1.0) && (u >= 0.0) && (v <= 1.0) && (v >= 0.0)) {
87         x = (image->xres - 1.0) * u; /* floating point X location */
88         y = (image->yres - 1.0) * v; /* floating point Y location */
89 
90         px = x - ((int)x);
91         py = y - ((int)y);
92 
93         x1 = (int)x;
94         x2 = x1 + 1;
95 
96         y1 = (int)y;
97         y2 = y1 + 1;
98 
99         ptr = image->data + ((image->xres * y1) + x1) * 3;
100         ptr2 = image->data + ((image->xres * y1) + x2) * 3;
101 
102         colx.r = (flt)((flt)ptr[0] + px * ((flt)ptr2[0] - (flt)ptr[0])) / 255.0;
103         colx.g = (flt)((flt)ptr[1] + px * ((flt)ptr2[1] - (flt)ptr[1])) / 255.0;
104         colx.b = (flt)((flt)ptr[2] + px * ((flt)ptr2[2] - (flt)ptr[2])) / 255.0;
105 
106         ptr = image->data + ((image->xres * y2) + x1) * 3;
107         ptr2 = image->data + ((image->xres * y2) + x2) * 3;
108 
109         colx2.r = ((flt)ptr[0] + px * ((flt)ptr2[0] - (flt)ptr[0])) / 255.0;
110         colx2.g = ((flt)ptr[1] + px * ((flt)ptr2[1] - (flt)ptr[1])) / 255.0;
111         colx2.b = ((flt)ptr[2] + px * ((flt)ptr2[2] - (flt)ptr[2])) / 255.0;
112 
113         col.r = colx.r + py * (colx2.r - colx.r);
114         col.g = colx.g + py * (colx2.g - colx.g);
115         col.b = colx.b + py * (colx2.b - colx.b);
116     }
117     else {
118         col.r = 0.0;
119         col.g = 0.0;
120         col.b = 0.0;
121     }
122     return col;
123 }
124 
AllocateImage(char * filename)125 rawimage *AllocateImage(char *filename) {
126     rawimage *newimage = nullptr;
127     int i, intable;
128     std::size_t len;
129 
130     intable = 0;
131     if (numimages != 0) {
132         for (i = 0; i < numimages; i++) {
133             if (!strcmp(filename, imagelist[i]->name)) {
134                 newimage = imagelist[i];
135                 intable = 1;
136             }
137         }
138     }
139 
140     if (!intable) {
141         newimage = (rawimage *)rt_getmem(sizeof(rawimage));
142         newimage->loaded = 0;
143         newimage->xres = 0;
144         newimage->yres = 0;
145         newimage->bpp = 0;
146         newimage->data = nullptr;
147         len = strlen(filename);
148         if (len > 80)
149             rtbomb("Filename too long in image map!!");
150         strcpy(newimage->name, filename);
151 
152         imagelist[numimages] = newimage; /* add new one to the table */
153         numimages++; /* increment the number of images */
154     }
155 
156     return newimage;
157 }
158 
DeallocateImage(rawimage * image)159 void DeallocateImage(rawimage *image) {
160     image->loaded = 0;
161     rt_freemem(image->data);
162 }
163