-=head2 8-bit per sample image internal functions
-
-These are the functions installed in an 8-bit per sample image.
-
-=over
-
-=item i_ppix_d(im, x, y, col)
-
-Internal function.
-
-This is the function kept in the i_f_ppix member of an i_img object.
-It does a normal store of a pixel into the image with range checking.
-
-Returns 0 if the pixel could be set, -1 otherwise.
-
-=cut
-*/
-static
-int
-i_ppix_d(i_img *im, int x, int y, const i_color *val) {
- int ch;
-
- if ( x>-1 && x<im->xsize && y>-1 && y<im->ysize ) {
- for(ch=0;ch<im->channels;ch++)
- if (im->ch_mask&(1<<ch))
- im->idata[(x+y*im->xsize)*im->channels+ch]=val->channel[ch];
- return 0;
- }
- return -1; /* error was clipped */
-}
-
-/*
-=item i_gpix_d(im, x, y, &col)
-
-Internal function.
-
-This is the function kept in the i_f_gpix member of an i_img object.
-It does normal retrieval of a pixel from the image with range checking.
-
-Returns 0 if the pixel could be set, -1 otherwise.
-
-=cut
-*/
-static
-int
-i_gpix_d(i_img *im, int x, int y, i_color *val) {
- int ch;
- if (x>-1 && x<im->xsize && y>-1 && y<im->ysize) {
- for(ch=0;ch<im->channels;ch++)
- val->channel[ch]=im->idata[(x+y*im->xsize)*im->channels+ch];
- return 0;
- }
- for(ch=0;ch<im->channels;ch++) val->channel[ch] = 0;
- return -1; /* error was cliped */
-}
-
-/*
-=item i_glin_d(im, l, r, y, vals)
-
-Reads a line of data from the image, storing the pixels at vals.
-
-The line runs from (l,y) inclusive to (r,y) non-inclusive
-
-vals should point at space for (r-l) pixels.
-
-l should never be less than zero (to avoid confusion about where to
-put the pixels in vals).
-
-Returns the number of pixels copied (eg. if r, l or y is out of range)
-
-=cut
-*/
-static
-int
-i_glin_d(i_img *im, int l, int r, int y, i_color *vals) {
- int ch, count, i;
- unsigned char *data;
- if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
- if (r > im->xsize)
- r = im->xsize;
- data = im->idata + (l+y*im->xsize) * im->channels;
- count = r - l;
- for (i = 0; i < count; ++i) {
- for (ch = 0; ch < im->channels; ++ch)
- vals[i].channel[ch] = *data++;
- }
- return count;
- }
- else {
- return 0;
- }
-}
-
-/*
-=item i_plin_d(im, l, r, y, vals)
-
-Writes a line of data into the image, using the pixels at vals.
-
-The line runs from (l,y) inclusive to (r,y) non-inclusive
-
-vals should point at (r-l) pixels.
-
-l should never be less than zero (to avoid confusion about where to
-get the pixels in vals).
-
-Returns the number of pixels copied (eg. if r, l or y is out of range)
-
-=cut
-*/
-static
-int
-i_plin_d(i_img *im, int l, int r, int y, const i_color *vals) {
- int ch, count, i;
- unsigned char *data;
- if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
- if (r > im->xsize)
- r = im->xsize;
- data = im->idata + (l+y*im->xsize) * im->channels;
- count = r - l;
- for (i = 0; i < count; ++i) {
- for (ch = 0; ch < im->channels; ++ch) {
- if (im->ch_mask & (1 << ch))
- *data = vals[i].channel[ch];
- ++data;
- }
- }
- return count;
- }
- else {
- return 0;
- }
-}
-
-/*
-=item i_ppixf_d(im, x, y, val)
-
-=cut
-*/
-static
-int
-i_ppixf_d(i_img *im, int x, int y, const i_fcolor *val) {
- int ch;
-
- if ( x>-1 && x<im->xsize && y>-1 && y<im->ysize ) {
- for(ch=0;ch<im->channels;ch++)
- if (im->ch_mask&(1<<ch)) {
- im->idata[(x+y*im->xsize)*im->channels+ch] =
- SampleFTo8(val->channel[ch]);
- }
- return 0;
- }
- return -1; /* error was clipped */
-}
-
-/*
-=item i_gpixf_d(im, x, y, val)
-
-=cut
-*/
-static
-int
-i_gpixf_d(i_img *im, int x, int y, i_fcolor *val) {
- int ch;
- if (x>-1 && x<im->xsize && y>-1 && y<im->ysize) {
- for(ch=0;ch<im->channels;ch++) {
- val->channel[ch] =
- Sample8ToF(im->idata[(x+y*im->xsize)*im->channels+ch]);
- }
- return 0;
- }
- return -1; /* error was cliped */
-}
-
-/*
-=item i_glinf_d(im, l, r, y, vals)
-
-Reads a line of data from the image, storing the pixels at vals.
-
-The line runs from (l,y) inclusive to (r,y) non-inclusive
-
-vals should point at space for (r-l) pixels.
-
-l should never be less than zero (to avoid confusion about where to
-put the pixels in vals).
-
-Returns the number of pixels copied (eg. if r, l or y is out of range)
-
-=cut
-*/
-static
-int
-i_glinf_d(i_img *im, int l, int r, int y, i_fcolor *vals) {
- int ch, count, i;
- unsigned char *data;
- if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
- if (r > im->xsize)
- r = im->xsize;
- data = im->idata + (l+y*im->xsize) * im->channels;
- count = r - l;
- for (i = 0; i < count; ++i) {
- for (ch = 0; ch < im->channels; ++ch)
- vals[i].channel[ch] = Sample8ToF(*data++);
- }
- return count;
- }
- else {
- return 0;
- }
-}
-
-/*
-=item i_plinf_d(im, l, r, y, vals)
-
-Writes a line of data into the image, using the pixels at vals.
-
-The line runs from (l,y) inclusive to (r,y) non-inclusive
-
-vals should point at (r-l) pixels.
-
-l should never be less than zero (to avoid confusion about where to
-get the pixels in vals).
-
-Returns the number of pixels copied (eg. if r, l or y is out of range)
-
-=cut
-*/
-static
-int
-i_plinf_d(i_img *im, int l, int r, int y, const i_fcolor *vals) {
- int ch, count, i;
- unsigned char *data;
- if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
- if (r > im->xsize)
- r = im->xsize;
- data = im->idata + (l+y*im->xsize) * im->channels;
- count = r - l;
- for (i = 0; i < count; ++i) {
- for (ch = 0; ch < im->channels; ++ch) {
- if (im->ch_mask & (1 << ch))
- *data = SampleFTo8(vals[i].channel[ch]);
- ++data;
- }
- }
- return count;
- }
- else {
- return 0;
- }
-}
-
-/*
-=item i_gsamp_d(i_img *im, int l, int r, int y, i_sample_t *samps, int *chans, int chan_count)
-
-Reads sample values from im for the horizontal line (l, y) to (r-1,y)
-for the channels specified by chans, an array of int with chan_count
-elements.
-
-Returns the number of samples read (which should be (r-l) * bits_set(chan_mask)
-
-=cut
-*/
-static
-int
-i_gsamp_d(i_img *im, int l, int r, int y, i_sample_t *samps,
- const int *chans, int chan_count) {
- int ch, count, i, w;
- unsigned char *data;
-
- if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
- if (r > im->xsize)
- r = im->xsize;
- data = im->idata + (l+y*im->xsize) * im->channels;
- w = r - l;
- count = 0;
-
- if (chans) {
- /* make sure we have good channel numbers */
- for (ch = 0; ch < chan_count; ++ch) {
- if (chans[ch] < 0 || chans[ch] >= im->channels) {
- i_push_errorf(0, "No channel %d in this image", chans[ch]);
- return 0;
- }
- }
- for (i = 0; i < w; ++i) {
- for (ch = 0; ch < chan_count; ++ch) {
- *samps++ = data[chans[ch]];
- ++count;
- }
- data += im->channels;
- }
- }
- else {
- if (chan_count <= 0 || chan_count > im->channels) {
- i_push_errorf(0, "chan_count %d out of range, must be >0, <= channels",
- chan_count);
- return 0;
- }
- for (i = 0; i < w; ++i) {
- for (ch = 0; ch < chan_count; ++ch) {
- *samps++ = data[ch];
- ++count;
- }
- data += im->channels;
- }
- }
-
- return count;
- }
- else {
- return 0;
- }
-}
-
-/*
-=item i_gsampf_d(i_img *im, int l, int r, int y, i_fsample_t *samps, int *chans, int chan_count)
-
-Reads sample values from im for the horizontal line (l, y) to (r-1,y)
-for the channels specified by chan_mask, where bit 0 is the first
-channel.
-
-Returns the number of samples read (which should be (r-l) * bits_set(chan_mask)
-
-=cut
-*/
-static
-int
-i_gsampf_d(i_img *im, int l, int r, int y, i_fsample_t *samps,
- const int *chans, int chan_count) {
- int ch, count, i, w;
- unsigned char *data;
- for (ch = 0; ch < chan_count; ++ch) {
- if (chans[ch] < 0 || chans[ch] >= im->channels) {
- i_push_errorf(0, "No channel %d in this image", chans[ch]);
- }
- }
- if (y >=0 && y < im->ysize && l < im->xsize && l >= 0) {
- if (r > im->xsize)
- r = im->xsize;
- data = im->idata + (l+y*im->xsize) * im->channels;
- w = r - l;
- count = 0;
-
- if (chans) {
- /* make sure we have good channel numbers */
- for (ch = 0; ch < chan_count; ++ch) {
- if (chans[ch] < 0 || chans[ch] >= im->channels) {
- i_push_errorf(0, "No channel %d in this image", chans[ch]);
- return 0;
- }
- }
- for (i = 0; i < w; ++i) {
- for (ch = 0; ch < chan_count; ++ch) {
- *samps++ = Sample8ToF(data[chans[ch]]);
- ++count;
- }
- data += im->channels;
- }
- }
- else {
- if (chan_count <= 0 || chan_count > im->channels) {
- i_push_errorf(0, "chan_count %d out of range, must be >0, <= channels",
- chan_count);
- return 0;
- }
- for (i = 0; i < w; ++i) {
- for (ch = 0; ch < chan_count; ++ch) {
- *samps++ = Sample8ToF(data[ch]);
- ++count;
- }
- data += im->channels;
- }
- }
- return count;
- }
- else {
- return 0;
- }
-}
-
-/*
-=back
-
projects / imager.git / blobdiff