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introduce corners

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This commit is contained in:
homm 2014-10-13 23:45:21 +04:00
parent b1cef839bd
commit d3d4ff69eb
1 changed files with 17 additions and 11 deletions
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22
libImaging/BoxBlur.c
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@ -20,6 +20,9 @@ HorizontalBoxBlur32(Imaging im, Imaging imOut, float floatRadius)
int w = 256 * (radius * 2 + 1) + rem * 2;
int w2 = w / 2;
int cornerA = radius + 1;
int cornerB = im->xsize - radius - 1;
// printf("%d %d %d\n", rem, w, w2);
#define MOVE_ACC(acc, substract, add) \
@ -44,8 +47,8 @@ HorizontalBoxBlur32(Imaging im, Imaging imOut, float floatRadius)
line = (pixel *) im->image32[y];
/* Compute acc for -1 pixel (outside of image):
From "-radius-1" to "0" get first pixel,
then from "1" to "radius-1". */
From "-radius-1" to "-1" get first pixel,
then from "0" to "radius-1". */
acc[0] = line[0][0] * (radius + 1);
acc[1] = line[0][1] * (radius + 1);
acc[2] = line[0][2] * (radius + 1);
@ -59,21 +62,21 @@ HorizontalBoxBlur32(Imaging im, Imaging imOut, float floatRadius)
/* Substract pixel from left ("0").
Add pixels from radius. */
for (x = 0; x < radius + 1; x++) {
for (x = 0; x < cornerA; x++) {
MOVE_ACC(acc, 0, x + radius);
ADD_FAR(bulk, acc, 0, x + radius + 1);
imOut->image32[x][y] = SAVE(bulk);
}
/* Substract previous pixel from "-radius".
Add pixels from radius. */
for (x = radius + 1; x < im->xsize - radius - 1; x++) {
for (x = cornerA; x < cornerB; x++) {
MOVE_ACC(acc, x - radius - 1, x + radius);
ADD_FAR(bulk, acc, x - radius - 1, x + radius + 1);
imOut->image32[x][y] = SAVE(bulk);
}
/* Substract previous pixel from "-radius".
Add last pixel. */
for (x = im->xsize - radius - 1; x < im->xsize; x++) {
for (x = cornerB; x < im->xsize; x++) {
MOVE_ACC(acc, x - radius - 1, lastx);
ADD_FAR(bulk, acc, x - radius - 1, lastx);
imOut->image32[x][y] = SAVE(bulk);
@ -103,6 +106,9 @@ HorizontalBoxBlur8(Imaging im, Imaging imOut, float floatRadius)
int w = 256 * (radius * 2 + 1) + rem * 2;
int w2 = w / 2;
int cornerA = radius + 1;
int cornerB = im->xsize - radius - 1;
ImagingSectionEnter(&cookie);
for (y = 0; y < im->ysize; y++) {
@ -113,17 +119,17 @@ HorizontalBoxBlur8(Imaging im, Imaging imOut, float floatRadius)
acc += line[pix];
}
for (x = 0; x < radius + 1; x++) {
for (x = 0; x < cornerA; x++) {
acc = acc + line[x + radius] - line[0];
bulk = (acc << 8) + (line[0] + line[x + radius + 1]) * rem;
imOut->image8[x][y] = (UINT8)((bulk + w2) / w);
}
for (x = radius + 1; x < im->xsize - radius - 1; x++) {
for (x = cornerA; x < cornerB; x++) {
acc = acc + line[x + radius] - line[x - radius - 1];
bulk = (acc << 8) + (line[x - radius - 1] + line[x + radius + 1]) * rem;
imOut->image8[x][y] = (UINT8)((bulk + w2) / w);
}
for (x = im->xsize - radius - 1; x < im->xsize; x++) {
for (x = cornerB; x < im->xsize; x++) {
acc = acc + line[lastx] - line[x - radius - 1];
bulk = (acc << 8) + (line[x - radius - 1] + line[lastx]) * rem;
imOut->image8[x][y] = (UINT8)((bulk + w2) / w);