1 /*
2 Copyright (c) 2005-2023 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 * imageio.cpp - This file deals with reading/writing image files
48 */
49
50 /* For our purposes, we're interested only in the 3 byte per pixel 24 bit
51 * truecolor sort of file..
52 */
53
54 #include <cstdio>
55
56 #include "machine.hpp"
57 #include "types.hpp"
58 #include "util.hpp"
59 #include "imageio.hpp"
60 #include "ppm.hpp" /* PPM files */
61 #include "tgafile.hpp" /* Truevision Targa files */
62 #include "jpeg.hpp" /* JPEG files */
63
fakeimage(char * name,int * xres,int * yres,unsigned char ** imgdata)64 static int fakeimage(char *name, int *xres, int *yres, unsigned char **imgdata) {
65 int i, imgsize;
66
67 fprintf(stderr, "Error loading image %s. Faking it.\n", name);
68
69 *xres = 2;
70 *yres = 2;
71 imgsize = 3 * (*xres) * (*yres);
72 *imgdata = (unsigned char *)rt_getmem(imgsize);
73 for (i = 0; i < imgsize; i++) {
74 (*imgdata)[i] = 255;
75 }
76
77 return IMAGENOERR;
78 }
79
readimage(rawimage * img)80 int readimage(rawimage *img) {
81 int rc;
82 int xres, yres;
83 unsigned char *imgdata = nullptr;
84 char *name = img->name;
85
86 if (strstr(name, ".ppm")) {
87 rc = readppm(name, &xres, &yres, &imgdata);
88 }
89 else if (strstr(name, ".tga")) {
90 rc = readtga(name, &xres, &yres, &imgdata);
91 }
92 else if (strstr(name, ".jpg")) {
93 rc = readjpeg(name, &xres, &yres, &imgdata);
94 }
95 else if (strstr(name, ".gif")) {
96 rc = IMAGEUNSUP;
97 }
98 else if (strstr(name, ".png")) {
99 rc = IMAGEUNSUP;
100 }
101 else if (strstr(name, ".tiff")) {
102 rc = IMAGEUNSUP;
103 }
104 else if (strstr(name, ".rgb")) {
105 rc = IMAGEUNSUP;
106 }
107 else if (strstr(name, ".xpm")) {
108 rc = IMAGEUNSUP;
109 }
110 else {
111 rc = readppm(name, &xres, &yres, &imgdata);
112 }
113
114 switch (rc) {
115 case IMAGEREADERR:
116 fprintf(stderr, "Short read encountered while loading image %s\n", name);
117 rc = IMAGENOERR; /* remap to non-fatal error */
118 break;
119
120 case IMAGEUNSUP:
121 fprintf(stderr, "Cannot read unsupported image format for image %s\n", name);
122 break;
123 }
124
125 /* If the image load failed, create a tiny white colored image to fake it */
126 /* this allows a scene to render even when a file can't be loaded */
127 if (rc != IMAGENOERR) {
128 rc = fakeimage(name, &xres, &yres, &imgdata);
129 }
130
131 /* If we succeeded in loading the image, return it. */
132 if (rc == IMAGENOERR) {
133 img->xres = xres;
134 img->yres = yres;
135 img->bpp = 3;
136 img->data = imgdata;
137 }
138
139 return rc;
140 }
141