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update box_blur help

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fix code style for `!`
fix spelling
This commit is contained in:
homm 2014-10-30 14:19:12 +03:00
parent 4323683a63
commit 36a35e7e27
3 changed files with 31 additions and 29 deletions
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12
PIL/ImageOps.py
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@ -446,14 +446,16 @@ usm = unsharp_mask
def box_blur(image, radius):
"""
Apply box blur to given image. Box blur is operation where
each pixel becomes the average value of pixels in given radius.
Supports float radius and very large ones. Fast implementation,
works in linear time relative to the radius.
Blur the image by setting each pixel to the average value of the pixels
in a square box extending radius pixels in each direction.
Supports float radius of arbitrary size. Uses an optimized implementation
which runs in linear time relative to the size of the image
for any radius value.
:param image: The image to blur.
:param radius: Size of the box in one direction. Radius 0 does not blur,
radius 1 takes 1 pixel in all directions, i.e. 9 pixels in total.
returns an identical image. Radius 1 takes 1 pixel
in each direction, i.e. 9 pixels in total.
:return: An image.
"""
image.load()

4
_imaging.c
View File

@ -872,7 +872,7 @@ _gaussian_blur(ImagingObject* self, PyObject* args)
if (!imOut)
return NULL;
if ( ! ImagingGaussianBlur(imOut, imIn, radius, passes))
if (!ImagingGaussianBlur(imOut, imIn, radius, passes))
return NULL;
return PyImagingNew(imOut);
@ -1797,7 +1797,7 @@ _unsharp_mask(ImagingObject* self, PyObject* args)
if (!imOut)
return NULL;
if ( ! ImagingUnsharpMask(imOut, imIn, radius, percent, threshold))
if (!ImagingUnsharpMask(imOut, imIn, radius, percent, threshold))
return NULL;
return PyImagingNew(imOut);

44
libImaging/BoxBlur.c
View File

@ -16,11 +16,11 @@ LineBoxBlur32(pixel *line, UINT32 *lineOut, int lastx, int radius, int edgeA,
UINT32 acc[4];
UINT32 bulk[4];
#define MOVE_ACC(acc, substract, add) \
acc[0] += line[add][0] - line[substract][0]; \
acc[1] += line[add][1] - line[substract][1]; \
acc[2] += line[add][2] - line[substract][2]; \
acc[3] += line[add][3] - line[substract][3];
#define MOVE_ACC(acc, subtract, add) \
acc[0] += line[add][0] - line[subtract][0]; \
acc[1] += line[add][1] - line[subtract][1]; \
acc[2] += line[add][2] - line[subtract][2]; \
acc[3] += line[add][3] - line[subtract][3];
#define ADD_FAR(bulk, acc, left, right) \
bulk[0] = (acc[0] * ww) + (line[left][0] + line[right][0]) * fw; \
@ -28,9 +28,9 @@ LineBoxBlur32(pixel *line, UINT32 *lineOut, int lastx, int radius, int edgeA,
bulk[2] = (acc[2] * ww) + (line[left][2] + line[right][2]) * fw; \
bulk[3] = (acc[3] * ww) + (line[left][3] + line[right][3]) * fw;
#define SAVE(acc) \
(UINT8)((acc[0] + (1 << 23)) >> 24) << 0 | (UINT8)((acc[1] + (1 << 23)) >> 24) << 8 | \
(UINT8)((acc[2] + (1 << 23)) >> 24) << 16 | (UINT8)((acc[3] + (1 << 23)) >> 24) << 24
#define SAVE(bulk) \
(UINT8)((bulk[0] + (1 << 23)) >> 24) << 0 | (UINT8)((bulk[1] + (1 << 23)) >> 24) << 8 | \
(UINT8)((bulk[2] + (1 << 23)) >> 24) << 16 | (UINT8)((bulk[3] + (1 << 23)) >> 24) << 24
/* Compute acc for -1 pixel (outside of image):
From "-radius-1" to "-1" get first pixel,
@ -54,21 +54,21 @@ LineBoxBlur32(pixel *line, UINT32 *lineOut, int lastx, int radius, int edgeA,
if (edgeA <= edgeB)
{
/* Substract pixel from left ("0").
/* Subtract pixel from left ("0").
Add pixels from radius. */
for (x = 0; x < edgeA; x++) {
MOVE_ACC(acc, 0, x + radius);
ADD_FAR(bulk, acc, 0, x + radius + 1);
lineOut[x] = SAVE(bulk);
}
/* Substract previous pixel from "-radius".
/* Subtract previous pixel from "-radius".
Add pixels from radius. */
for (x = edgeA; x < edgeB; x++) {
MOVE_ACC(acc, x - radius - 1, x + radius);
ADD_FAR(bulk, acc, x - radius - 1, x + radius + 1);
lineOut[x] = SAVE(bulk);
}
/* Substract previous pixel from "-radius".
/* Subtract previous pixel from "-radius".
Add last pixel. */
for (x = edgeB; x <= lastx; x++) {
MOVE_ACC(acc, x - radius - 1, lastx);
@ -109,14 +109,14 @@ LineBoxBlur8(UINT8 *line, UINT8 *lineOut, int lastx, int radius, int edgeA,
UINT32 acc;
UINT32 bulk;
#define MOVE_ACC(acc, substract, add) \
acc += line[add] - line[substract];
#define MOVE_ACC(acc, subtract, add) \
acc += line[add] - line[subtract];
#define ADD_FAR(bulk, acc, left, right) \
bulk = (acc * ww) + (line[left] + line[right]) * fw;
#define SAVE(acc) \
(UINT8)((acc + (1 << 23)) >> 24)
#define SAVE(bulk) \
(UINT8)((bulk + (1 << 23)) >> 24)
acc = line[0] * (radius + 1);
for (x = 0; x < edgeA - 1; x++) {
@ -252,17 +252,17 @@ ImagingBoxBlur(Imaging imOut, Imaging imIn, float radius, int n)
if (imIn->type != IMAGING_TYPE_UINT8)
return ImagingError_ModeError();
if ( ! (strcmp(imIn->mode, "RGB") == 0 ||
strcmp(imIn->mode, "RGBA") == 0 ||
strcmp(imIn->mode, "RGBX") == 0 ||
strcmp(imIn->mode, "CMYK") == 0 ||
strcmp(imIn->mode, "L") == 0 ||
strcmp(imIn->mode, "LA") == 0))
if (!(strcmp(imIn->mode, "RGB") == 0 ||
strcmp(imIn->mode, "RGBA") == 0 ||
strcmp(imIn->mode, "RGBX") == 0 ||
strcmp(imIn->mode, "CMYK") == 0 ||
strcmp(imIn->mode, "L") == 0 ||
strcmp(imIn->mode, "LA") == 0))
return ImagingError_ModeError();
/* Create transposed temp image (imIn->ysize x imIn->xsize). */
Imaging temp = ImagingNew(imIn->mode, imIn->ysize, imIn->xsize);
if ( ! temp)
if (!temp)
return NULL;
/* Apply one-dimensional blur.