4 img16.c - implements 16-bit images
8 i_img *im = i_img_16_new(int x, int y, int channels);
9 # use like a normal image
13 Implements 16-bit/sample images.
15 This basic implementation is required so that we have some larger
16 sample image type to work with.
26 static int i_ppix_d16(i_img *im, int x, int y, i_color *val);
27 static int i_gpix_d16(i_img *im, int x, int y, i_color *val);
28 static int i_glin_d16(i_img *im, int l, int r, int y, i_color *vals);
29 static int i_plin_d16(i_img *im, int l, int r, int y, i_color *vals);
30 static int i_ppixf_d16(i_img *im, int x, int y, i_fcolor *val);
31 static int i_gpixf_d16(i_img *im, int x, int y, i_fcolor *val);
32 static int i_glinf_d16(i_img *im, int l, int r, int y, i_fcolor *vals);
33 static int i_plinf_d16(i_img *im, int l, int r, int y, i_fcolor *vals);
34 static int i_gsamp_d16(i_img *im, int l, int r, int y, i_sample_t *samps,
35 int const *chans, int chan_count);
36 static int i_gsampf_d16(i_img *im, int l, int r, int y, i_fsample_t *samps,
37 int const *chans, int chan_count);
40 =item IIM_base_16bit_direct
42 Base structure used to initialize a 16-bit/sample image.
48 static i_img IIM_base_16bit_direct =
51 0, 0, 0, /* xsize, ysize, bytes */
54 i_direct_type, /* type */
57 { 0, 0, NULL }, /* tags */
60 i_ppix_d16, /* i_f_ppix */
61 i_ppixf_d16, /* i_f_ppixf */
62 i_plin_d16, /* i_f_plin */
63 i_plinf_d16, /* i_f_plinf */
64 i_gpix_d16, /* i_f_gpix */
65 i_gpixf_d16, /* i_f_gpixf */
66 i_glin_d16, /* i_f_glin */
67 i_glinf_d16, /* i_f_glinf */
68 i_gsamp_d16, /* i_f_gsamp */
69 i_gsampf_d16, /* i_f_gsampf */
73 NULL, /* i_f_addcolor */
74 NULL, /* i_f_getcolor */
75 NULL, /* i_f_colorcount */
76 NULL, /* i_f_findcolor */
78 NULL, /* i_f_destroy */
81 /* it's possible some platforms won't have a 16-bit integer type,
82 so we check for one otherwise we work by bytes directly
84 We do assume 8-bit char
86 "Compaq C V6.4-009 on Compaq Tru64 UNIX V5.1A (Rev. 1885)" says it
87 supports C99, but doesn't supply stdint.h, which is required for
88 both hosted and freestanding implementations. So guard against it.
90 #if __STDC_VERSION__ >= 199901L && !defined(OS_dec_osf)
91 /* C99 should define something useful */
94 typedef uint16_t i_sample16_t;
99 /* check out unsigned short */
102 #if USHRT_MAX == 65535
103 typedef unsigned short i_sample16_t;
110 /* we have a real 16-bit unsigned integer */
111 #define STORE16(bytes, offset, word) \
112 (((i_sample16_t *)(bytes))[offset] = (word))
113 #define STORE8as16(bytes, offset, byte) \
114 (((i_sample16_t *)(bytes))[offset] = (byte) * 256)
115 #define GET16(bytes, offset) \
116 (((i_sample16_t *)(bytes))[offset])
117 #define GET16as8(bytes, offset) \
118 (((i_sample16_t *)(bytes))[offset] / 256)
122 /* we have to do this the hard way */
123 #define STORE16(bytes, offset, word) \
124 ((((unsigned char *)(bytes))[(offset)*2] = (word) >> 8), \
125 (((unsigned char *)(bytes))[(offset)*2+1] = (word) & 0xFF))
126 #define STORE8as16(bytes, offset, byte) \
127 ((((unsigned char *)(bytes))[(offset)*2] = (byte)), \
128 (((unsigned char *)(bytes))[(offset)*2+1] = 0))
130 #define GET16(bytes, offset) \
131 (((unsigned char *)(bytes))[(offset)*2] * 256 \
132 + ((unsigned char *)(bytes))[(offset)*2+1])
133 #define GET16as8(bytes, offset) \
134 (((unsigned char *)(bytes))[(offset)*2] << 8)
139 =item i_img_16_new(int x, int y, int ch)
141 Creates a new 16-bit per sample image.
145 i_img *i_img_16_new_low(i_img *im, int x, int y, int ch) {
147 mm_log((1,"i_img_16_new(x %d, y %d, ch %d)\n", x, y, ch));
149 if (x < 1 || y < 1) {
150 i_push_error(0, "Image sizes must be positive");
153 if (ch < 1 || ch > MAXCHANNELS) {
154 i_push_errorf(0, "channels must be between 1 and %d", MAXCHANNELS);
157 bytes = x * y * ch * 2;
158 if (bytes / y / ch / 2 != x) {
159 i_push_errorf(0, "integer overflow calculating image allocation");
163 *im = IIM_base_16bit_direct;
164 i_tags_new(&im->tags);
170 im->idata = mymalloc(im->bytes);
172 memset(im->idata, 0, im->bytes);
175 i_tags_destroy(&im->tags);
182 i_img *i_img_16_new(int x, int y, int ch) {
187 im = mymalloc(sizeof(i_img));
189 if (!i_img_16_new_low(im, x, y, ch)) {
195 mm_log((1, "(%p) <- i_img_16_new\n", im));
200 static int i_ppix_d16(i_img *im, int x, int y, i_color *val) {
203 if (x < 0 || x >= im->xsize || y < 0 || y > im->ysize)
206 off = (x + y * im->xsize) * im->channels;
207 for (ch = 0; ch < im->channels; ++ch)
208 STORE8as16(im->idata, off+ch, val->channel[ch]);
213 static int i_gpix_d16(i_img *im, int x, int y, i_color *val) {
216 if (x < 0 || x >= im->xsize || y < 0 || y > im->ysize)
219 off = (x + y * im->xsize) * im->channels;
220 for (ch = 0; ch < im->channels; ++ch)
221 val->channel[ch] = GET16as8(im->idata, off+ch);
226 static int i_ppixf_d16(i_img *im, int x, int y, i_fcolor *val) {
229 if (x < 0 || x >= im->xsize || y < 0 || y > im->ysize)
232 off = (x + y * im->xsize) * im->channels;
233 for (ch = 0; ch < im->channels; ++ch)
234 STORE16(im->idata, off+ch, SampleFTo16(val->channel[ch]));
239 static int i_gpixf_d16(i_img *im, int x, int y, i_fcolor *val) {
242 if (x < 0 || x >= im->xsize || y < 0 || y > im->ysize)
245 off = (x + y * im->xsize) * im->channels;
246 for (ch = 0; ch < im->channels; ++ch)
247 val->channel[ch] = Sample16ToF(GET16(im->idata, off+ch));
252 static int i_glin_d16(i_img *im, int l, int r, int y, i_color *vals) {
255 if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
258 off = (l+y*im->xsize) * im->channels;
260 for (i = 0; i < count; ++i) {
261 for (ch = 0; ch < im->channels; ++ch) {
262 vals[i].channel[ch] = GET16as8(im->idata, off);
273 static int i_plin_d16(i_img *im, int l, int r, int y, i_color *vals) {
276 if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
279 off = (l+y*im->xsize) * im->channels;
281 for (i = 0; i < count; ++i) {
282 for (ch = 0; ch < im->channels; ++ch) {
283 STORE8as16(im->idata, off, vals[i].channel[ch]);
294 static int i_glinf_d16(i_img *im, int l, int r, int y, i_fcolor *vals) {
297 if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
300 off = (l+y*im->xsize) * im->channels;
302 for (i = 0; i < count; ++i) {
303 for (ch = 0; ch < im->channels; ++ch) {
304 vals[i].channel[ch] = Sample16ToF(GET16(im->idata, off));
315 static int i_plinf_d16(i_img *im, int l, int r, int y, i_fcolor *vals) {
318 if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
321 off = (l+y*im->xsize) * im->channels;
323 for (i = 0; i < count; ++i) {
324 for (ch = 0; ch < im->channels; ++ch) {
325 STORE16(im->idata, off, SampleFTo16(vals[i].channel[ch]));
336 static int i_gsamp_d16(i_img *im, int l, int r, int y, i_sample_t *samps,
337 int const *chans, int chan_count) {
341 if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
344 off = (l+y*im->xsize) * im->channels;
349 /* make sure we have good channel numbers */
350 for (ch = 0; ch < chan_count; ++ch) {
351 if (chans[ch] < 0 || chans[ch] >= im->channels) {
352 i_push_errorf(0, "No channel %d in this image", chans[ch]);
356 for (i = 0; i < w; ++i) {
357 for (ch = 0; ch < chan_count; ++ch) {
358 *samps++ = GET16as8(im->idata, off+chans[ch]);
365 for (i = 0; i < w; ++i) {
366 for (ch = 0; ch < chan_count; ++ch) {
367 *samps++ = GET16as8(im->idata, off+ch);
381 static int i_gsampf_d16(i_img *im, int l, int r, int y, i_fsample_t *samps,
382 int const *chans, int chan_count) {
386 if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
389 off = (l+y*im->xsize) * im->channels;
394 /* make sure we have good channel numbers */
395 for (ch = 0; ch < chan_count; ++ch) {
396 if (chans[ch] < 0 || chans[ch] >= im->channels) {
397 i_push_errorf(0, "No channel %d in this image", chans[ch]);
401 for (i = 0; i < w; ++i) {
402 for (ch = 0; ch < chan_count; ++ch) {
403 *samps++ = Sample16ToF(GET16(im->idata, off+chans[ch]));
410 for (i = 0; i < w; ++i) {
411 for (ch = 0; ch < chan_count; ++ch) {
412 *samps++ = Sample16ToF(GET16(im->idata, off+ch));
431 Tony Cook <tony@develop-help.com>