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/* |
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=head1 NAME |
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combine.im - combining channels into an image |
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=head1 SYNOPSIS |
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out = i_combine(imgs, channels, count); |
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=head1 DESCRIPTION |
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Combines channels from the input images into an output image. |
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=over |
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=cut |
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*/ |
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#include "imager.h" |
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i_img * |
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i_combine(i_img **imgs, const int *channels, int in_count) { |
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i_img *out = NULL; |
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int maxbits = 0; |
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i_img *maximg = NULL; |
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int i; |
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i_img_dim width, height; |
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i_img_dim x, y; |
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i_clear_error(); |
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100
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if (in_count <= 0) { |
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1
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i_push_error(0, "At least one image must be supplied"); |
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return NULL; |
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} |
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100
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if (in_count > MAXCHANNELS) { |
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i_push_errorf(0, "Maximum of %d channels, you supplied %d", |
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MAXCHANNELS, in_count); |
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return NULL; |
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} |
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width = imgs[0]->xsize; |
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height = imgs[0]->ysize; |
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100
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for (i = 0; i < in_count; ++i) { |
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if (imgs[i]->bits > maxbits) { |
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maximg = imgs[i]; |
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maxbits = maximg->bits; |
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} |
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if (imgs[i]->xsize < width) |
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0
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width = imgs[i]->xsize; |
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if (imgs[i]->ysize < height) |
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height = imgs[i]->ysize; |
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100
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if (channels[i] < 0) { |
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i_push_error(0, "Channel numbers must be zero or positive"); |
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1
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return NULL; |
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} |
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100
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if (channels[i] >= imgs[i]->channels) { |
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1
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i_push_errorf(0, "Channel %d for image %d is too high (%d channels)", |
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channels[i], i, imgs[i]->channels); |
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1
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return NULL; |
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} |
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} |
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out = i_sametype_chans(maximg, width, height, in_count); |
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if (!out) |
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0
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return NULL; |
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100
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#code maxbits <= i_8_bits |
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IM_SAMPLE_T *in_row = mymalloc(sizeof(IM_SAMPLE_T) * width); |
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IM_COLOR *out_row = mymalloc(sizeof(IM_COLOR) * width); |
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1057
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for (y = 0; y < height; ++y) { |
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100
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2850
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for (i = 0; i < in_count; ++i) { |
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100
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1800
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IM_GSAMP(imgs[i], 0, width, y, in_row, channels + i, 1); |
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271800
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for (x = 0; x < width; ++x) |
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100
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270000
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out_row[x].channel[i] = in_row[x]; |
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} |
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1050
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IM_PLIN(out, 0, width, y, out_row); |
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} |
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myfree(out_row); |
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7
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myfree(in_row); |
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#/code |
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return out; |
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} |