2014-10-12 16:30:00 +04:00
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#include "Python.h"
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#include "Imaging.h"
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2014-10-12 17:11:24 +04:00
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Imaging
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HorizontalBoxBlur32(Imaging im, Imaging imOut, int radius)
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2014-10-12 16:30:00 +04:00
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{
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2014-10-12 17:11:24 +04:00
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ImagingSectionCookie cookie;
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2014-10-12 17:47:00 +04:00
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int x, y, pix;
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2014-10-12 17:11:24 +04:00
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int acc[4];
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typedef UINT8 pixel[4];
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pixel *line;
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2014-10-12 17:47:00 +04:00
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int lastx = im->xsize - 1;
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2014-10-12 17:11:24 +04:00
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int window = radius * 2 + 1;
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2014-10-12 17:47:00 +04:00
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#define SAVE(acc) \
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(UINT8)(acc[0] / window) | (UINT8)(acc[1] / window) << 8 | \
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(UINT8)(acc[2] / window) << 16 | (UINT8)(acc[3] / window) << 24
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#define MOVE_ACC(acc, substract, add) \
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acc[0] -= line[substract][0]; \
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acc[1] -= line[substract][1]; \
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acc[2] -= line[substract][2]; \
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acc[3] -= line[substract][3]; \
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acc[0] += line[add][0]; \
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acc[1] += line[add][1]; \
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acc[2] += line[add][2]; \
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acc[3] += line[add][3];
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2014-10-12 17:11:24 +04:00
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ImagingSectionEnter(&cookie);
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for (y = 0; y < im->ysize; y++) {
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line = (pixel *) im->image32[y];
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2014-10-12 17:47:00 +04:00
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/* Compute acc for -1 pixel (outside of image):
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From "-radius-1" to "0" get first pixel,
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then from "1" to "radius-1". */
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acc[0] = line[0][0] * (radius + 2);
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acc[1] = line[0][1] * (radius + 2);
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acc[2] = line[0][2] * (radius + 2);
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acc[3] = line[0][3] * (radius + 2);
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for (pix = 1; pix < radius; pix++) {
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acc[0] += line[pix][0];
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acc[1] += line[pix][1];
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acc[2] += line[pix][2];
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acc[3] += line[pix][3];
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}
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/* Substract pixel from left ("0").
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Add pixels from radius. */
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for (x = 0; x <= radius; x++) {
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MOVE_ACC(acc, 0, x + radius);
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imOut->image32[y][x] = SAVE(acc);
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}
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/* Substract previous pixel from "-radius".
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Add pixels from radius. */
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for (x = radius + 1; x < im->xsize - radius; x++) {
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MOVE_ACC(acc, x - radius - 1, x + radius);
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imOut->image32[y][x] = SAVE(acc);
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}
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/* Substract previous pixel from "-radius".
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Add last pixel. */
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for (x = im->xsize - radius; x < im->xsize; x++) {
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MOVE_ACC(acc, x - radius - 1, lastx);
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imOut->image32[y][x] = SAVE(acc);
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2014-10-12 17:11:24 +04:00
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}
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}
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ImagingSectionLeave(&cookie);
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return imOut;
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}
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Imaging
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ImagingBoxBlur(Imaging im, Imaging imOut, int radius)
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{
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HorizontalBoxBlur32(im, imOut, radius);
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2014-10-12 16:30:00 +04:00
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return imOut;
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}
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