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92bda63 - start of external Imager API access:
Tony Cook authored
1 #include "imager.h"
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2 #include <stdio.h>
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3 #include "iolayer.h"
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4 #ifndef _MSC_VER
5 #include <unistd.h>
6 #endif
7 #include <string.h>
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8 #include <errno.h>
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9
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10
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11
12 /*
13
14 Image loader for raw files.
15
16 This is a barebones raw loader...
17
18 fd: filedescriptor
19 x: xsize
20 y: ysize
21 datachannels: the number of channels the file contains
22 storechannels: the bitmap of channels we will read
23 intrl: interlace flag,
24 0 = sample interleaving
25 1 = line interleaving
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26 2 = image interleaving (not implemented)
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27
28 */
29
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30 static
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31 void
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32 interleave(unsigned char *inbuffer,unsigned char *outbuffer,i_img_dim rowsize,int channels) {
33 i_img_dim ind,i;
34 int ch;
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35 i=0;
36 if (inbuffer == outbuffer) return; /* Check if data is already in interleaved format */
37 for (ind=0; ind<rowsize; ind++)
38 for (ch=0; ch<channels; ch++)
39 outbuffer[i++] = inbuffer[rowsize*ch+ind];
40 }
41
42 static
43 void
44 expandchannels(unsigned char *inbuffer, unsigned char *outbuffer,
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45 i_img_dim xsize, int datachannels, int storechannels) {
46 i_img_dim x;
47 int ch;
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48 int copy_chans = storechannels > datachannels ? datachannels : storechannels;
49 if (inbuffer == outbuffer)
50 return; /* Check if data is already in expanded format */
51 for(x = 0; x < xsize; x++) {
52 for (ch = 0; ch < copy_chans; ch++)
53 outbuffer[x*storechannels+ch] = inbuffer[x*datachannels+ch];
54 for (; ch < storechannels; ch++)
55 outbuffer[x*storechannels+ch] = 0;
56 }
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57 }
58
59 i_img *
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60 i_readraw_wiol(io_glue *ig, i_img_dim x, i_img_dim y, int datachannels, int storechannels, int intrl) {
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61 i_img* im;
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62 ssize_t rc;
63 i_img_dim k;
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64
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65 unsigned char *inbuffer;
66 unsigned char *ilbuffer;
67 unsigned char *exbuffer;
68
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69 size_t inbuflen,ilbuflen,exbuflen;
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70
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71 i_clear_error();
72
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73 mm_log((1, "i_readraw(ig %p,x %" i_DF ",y %" i_DF ",datachannels %d,storechannels %d,intrl %d)\n",
74 ig, i_DFc(x), i_DFc(y), datachannels, storechannels, intrl));
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75
76 if (intrl != 0 && intrl != 1) {
77 i_push_error(0, "raw_interleave must be 0 or 1");
78 return NULL;
79 }
80 if (storechannels < 1 || storechannels > 4) {
81 i_push_error(0, "raw_storechannels must be between 1 and 4");
82 return NULL;
83 }
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84
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85 im = i_img_empty_ch(NULL,x,y,storechannels);
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86 if (!im)
87 return NULL;
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88
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89 inbuflen = im->xsize*datachannels;
90 ilbuflen = inbuflen;
91 exbuflen = im->xsize*storechannels;
92 inbuffer = (unsigned char*)mymalloc(inbuflen);
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93 mm_log((1,"inbuflen: %ld, ilbuflen: %ld, exbuflen: %ld.\n",
94 (long)inbuflen, (long)ilbuflen, (long)exbuflen));
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95
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96 if (intrl==0) ilbuffer = inbuffer;
97 else ilbuffer=mymalloc(inbuflen);
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98
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99 if (datachannels==storechannels) exbuffer=ilbuffer;
100 else exbuffer= mymalloc(exbuflen);
101
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102 k=0;
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103 while( k<im->ysize ) {
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104 rc = i_io_read(ig, inbuffer, inbuflen);
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105 if (rc != inbuflen) {
106 if (rc < 0)
107 i_push_error(0, "error reading file");
108 else
109 i_push_error(0, "premature end of file");
110 i_img_destroy(im);
111 myfree(inbuffer);
112 if (intrl != 0) myfree(ilbuffer);
113 if (datachannels != storechannels) myfree(exbuffer);
114 return NULL;
115 }
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116 interleave(inbuffer,ilbuffer,im->xsize,datachannels);
117 expandchannels(ilbuffer,exbuffer,im->xsize,datachannels,storechannels);
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118 /* FIXME: Do we ever want to save to a virtual image? */
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119 memcpy(&(im->idata[im->xsize*storechannels*k]),exbuffer,exbuflen);
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120 k++;
121 }
122
123 myfree(inbuffer);
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124 if (intrl != 0) myfree(ilbuffer);
125 if (datachannels != storechannels) myfree(exbuffer);
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126
127 i_tags_add(&im->tags, "i_format", 0, "raw", -1, 0);
128
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129 return im;
130 }
131
132
133
134 undef_int
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135 i_writeraw_wiol(i_img* im, io_glue *ig) {
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136 ssize_t rc;
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137
138 i_clear_error();
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139 mm_log((1,"writeraw(im %p,ig %p)\n", im, ig));
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140
141 if (im == NULL) { mm_log((1,"Image is empty\n")); return(0); }
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142 if (!im->virtual) {
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143 rc = i_io_write(ig,im->idata,im->bytes);
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144 if (rc != im->bytes) {
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145 i_push_error(errno, "Could not write to file");
146 mm_log((1,"i_writeraw: Couldn't write to file\n"));
147 return(0);
148 }
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149 } else {
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150 if (im->type == i_direct_type) {
151 /* just save it as 8-bits, maybe support saving higher bit count
152 raw images later */
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153 size_t line_size = im->xsize * im->channels;
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154 unsigned char *data = mymalloc(line_size);
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155
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156 i_img_dim y = 0;
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157 rc = line_size;
158 while (rc == line_size && y < im->ysize) {
159 i_gsamp(im, 0, im->xsize, y, data, NULL, im->channels);
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160 rc = i_io_write(ig, data, line_size);
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161 ++y;
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162 }
163 if (rc != line_size) {
164 i_push_error(errno, "write error");
165 return 0;
166 }
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167 myfree(data);
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168 } else {
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169 /* paletted image - assumes the caller puts the palette somewhere
170 else
171 */
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172 size_t line_size = sizeof(i_palidx) * im->xsize;
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173 i_palidx *data = mymalloc(sizeof(i_palidx) * im->xsize);
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174
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175 i_img_dim y = 0;
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176 rc = line_size;
177 while (rc == line_size && y < im->ysize) {
178 i_gpal(im, 0, im->xsize, y, data);
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179 rc = i_io_write(ig, data, line_size);
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180 ++y;
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181 }
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182 myfree(data);
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183 if (rc != line_size) {
184 i_push_error(errno, "write error");
185 return 0;
186 }
187 }
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188 }
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189
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190 if (i_io_close(ig))
191 return 0;
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192
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193 return(1);
194 }
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