mirror of
https://github.com/python-pillow/Pillow.git
synced 2025-10-25 05:01:26 +03:00
348 lines
13 KiB
C
348 lines
13 KiB
C
/*
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* The Python Imaging Library
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* $Id$
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*
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* apply convolution kernel to image
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*
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* history:
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* 1995-11-26 fl Created, supports 3x3 kernels
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* 1995-11-27 fl Added 5x5 kernels, copy border
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* 1999-07-26 fl Eliminated a few compiler warnings
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* 2002-06-09 fl Moved kernel definitions to Python
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* 2002-06-11 fl Support floating point kernels
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* 2003-09-15 fl Added ImagingExpand helper
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*
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* Copyright (c) Secret Labs AB 1997-2002. All rights reserved.
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* Copyright (c) Fredrik Lundh 1995.
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*
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* See the README file for information on usage and redistribution.
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*/
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/*
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* FIXME: Support RGB and RGBA/CMYK modes as well
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* FIXME: Expand image border (current version leaves border as is)
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* FIXME: Implement image processing gradient filters
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*/
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#include "Imaging.h"
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static inline UINT8 clip8(float in)
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{
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if (in <= 0.0)
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return 0;
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if (in >= 255.0)
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return 255;
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return (UINT8) in;
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}
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Imaging
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ImagingExpand(Imaging imIn, int xmargin, int ymargin, int mode)
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{
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Imaging imOut;
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int x, y;
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ImagingSectionCookie cookie;
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if (xmargin < 0 && ymargin < 0)
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return (Imaging) ImagingError_ValueError("bad kernel size");
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imOut = ImagingNewDirty(
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imIn->mode, imIn->xsize+2*xmargin, imIn->ysize+2*ymargin);
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if (!imOut)
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return NULL;
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#define EXPAND_LINE(type, image, yin, yout) {\
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for (x = 0; x < xmargin; x++)\
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imOut->image[yout][x] = imIn->image[yin][0];\
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for (x = 0; x < imIn->xsize; x++)\
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imOut->image[yout][x+xmargin] = imIn->image[yin][x];\
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for (x = 0; x < xmargin; x++)\
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imOut->image[yout][xmargin+imIn->xsize+x] =\
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imIn->image[yin][imIn->xsize-1];\
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}
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#define EXPAND(type, image) {\
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for (y = 0; y < ymargin; y++)\
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EXPAND_LINE(type, image, 0, y);\
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for (y = 0; y < imIn->ysize; y++)\
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EXPAND_LINE(type, image, y, y+ymargin);\
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for (y = 0; y < ymargin; y++)\
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EXPAND_LINE(type, image, imIn->ysize-1, ymargin+imIn->ysize+y);\
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}
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ImagingSectionEnter(&cookie);
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if (imIn->image8) {
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EXPAND(UINT8, image8);
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} else {
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EXPAND(INT32, image32);
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}
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ImagingSectionLeave(&cookie);
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ImagingCopyPalette(imOut, imIn);
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return imOut;
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}
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void
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ImagingFilter3x3(Imaging imOut, Imaging im, const float* kernel,
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float offset)
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{
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#define KERNEL1x3(in0, x, kernel, d) ( \
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_i2f((UINT8) in0[x-d]) * (kernel)[0] + \
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_i2f((UINT8) in0[x]) * (kernel)[1] + \
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_i2f((UINT8) in0[x+d]) * (kernel)[2])
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int x = 0, y = 0;
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memcpy(imOut->image[0], im->image[0], im->linesize);
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if (im->bands == 1) {
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// Add one time for rounding
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offset += 0.5;
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for (y = 1; y < im->ysize-1; y++) {
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UINT8* in_1 = (UINT8*) im->image[y-1];
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UINT8* in0 = (UINT8*) im->image[y];
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UINT8* in1 = (UINT8*) im->image[y+1];
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UINT8* out = (UINT8*) imOut->image[y];
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out[0] = in0[0];
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for (x = 1; x < im->xsize-1; x++) {
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float ss = offset;
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ss += KERNEL1x3(in1, x, &kernel[0], 1);
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ss += KERNEL1x3(in0, x, &kernel[3], 1);
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ss += KERNEL1x3(in_1, x, &kernel[6], 1);
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out[x] = clip8(ss);
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}
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out[x] = in0[x];
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}
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} else {
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// Add one time for rounding
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offset += 0.5;
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for (y = 1; y < im->ysize-1; y++) {
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UINT8* in_1 = (UINT8*) im->image[y-1];
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UINT8* in0 = (UINT8*) im->image[y];
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UINT8* in1 = (UINT8*) im->image[y+1];
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UINT32* out = (UINT32*) imOut->image[y];
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out[0] = ((UINT32*) in0)[0];
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if (im->bands == 2) {
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for (x = 1; x < im->xsize-1; x++) {
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float ss0 = offset;
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float ss3 = offset;
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ss0 += KERNEL1x3(in1, x*4+0, &kernel[0], 4);
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ss3 += KERNEL1x3(in1, x*4+3, &kernel[0], 4);
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ss0 += KERNEL1x3(in0, x*4+0, &kernel[3], 4);
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ss3 += KERNEL1x3(in0, x*4+3, &kernel[3], 4);
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ss0 += KERNEL1x3(in_1, x*4+0, &kernel[6], 4);
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ss3 += KERNEL1x3(in_1, x*4+3, &kernel[6], 4);
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out[x] = MAKE_UINT32(clip8(ss0), 0, 0, clip8(ss3));
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}
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} else if (im->bands == 3) {
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for (x = 1; x < im->xsize-1; x++) {
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float ss0 = offset;
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float ss1 = offset;
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float ss2 = offset;
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ss0 += KERNEL1x3(in1, x*4+0, &kernel[0], 4);
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ss1 += KERNEL1x3(in1, x*4+1, &kernel[0], 4);
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ss2 += KERNEL1x3(in1, x*4+2, &kernel[0], 4);
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ss0 += KERNEL1x3(in0, x*4+0, &kernel[3], 4);
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ss1 += KERNEL1x3(in0, x*4+1, &kernel[3], 4);
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ss2 += KERNEL1x3(in0, x*4+2, &kernel[3], 4);
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ss0 += KERNEL1x3(in_1, x*4+0, &kernel[6], 4);
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ss1 += KERNEL1x3(in_1, x*4+1, &kernel[6], 4);
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ss2 += KERNEL1x3(in_1, x*4+2, &kernel[6], 4);
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out[x] = MAKE_UINT32(
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clip8(ss0), clip8(ss1), clip8(ss2), 0);
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}
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} else if (im->bands == 4) {
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for (x = 1; x < im->xsize-1; x++) {
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float ss0 = offset;
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float ss1 = offset;
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float ss2 = offset;
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float ss3 = offset;
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ss0 += KERNEL1x3(in1, x*4+0, &kernel[0], 4);
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ss1 += KERNEL1x3(in1, x*4+1, &kernel[0], 4);
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ss2 += KERNEL1x3(in1, x*4+2, &kernel[0], 4);
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ss3 += KERNEL1x3(in1, x*4+3, &kernel[0], 4);
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ss0 += KERNEL1x3(in0, x*4+0, &kernel[3], 4);
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ss1 += KERNEL1x3(in0, x*4+1, &kernel[3], 4);
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ss2 += KERNEL1x3(in0, x*4+2, &kernel[3], 4);
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ss3 += KERNEL1x3(in0, x*4+3, &kernel[3], 4);
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ss0 += KERNEL1x3(in_1, x*4+0, &kernel[6], 4);
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ss1 += KERNEL1x3(in_1, x*4+1, &kernel[6], 4);
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ss2 += KERNEL1x3(in_1, x*4+2, &kernel[6], 4);
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ss3 += KERNEL1x3(in_1, x*4+3, &kernel[6], 4);
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out[x] = MAKE_UINT32(
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clip8(ss0), clip8(ss1), clip8(ss2), clip8(ss3));
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}
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}
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out[x] = ((UINT32*) in0)[x];
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}
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}
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memcpy(imOut->image[y], im->image[y], im->linesize);
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}
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void
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ImagingFilter5x5(Imaging imOut, Imaging im, const float* kernel,
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float offset)
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{
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#define KERNEL1x5(in0, x, kernel, d) ( \
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_i2f((UINT8) in0[x-d-d]) * (kernel)[0] + \
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_i2f((UINT8) in0[x-d]) * (kernel)[1] + \
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_i2f((UINT8) in0[x]) * (kernel)[2] + \
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_i2f((UINT8) in0[x+d]) * (kernel)[3] + \
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_i2f((UINT8) in0[x+d+d]) * (kernel)[4])
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int x = 0, y = 0;
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memcpy(imOut->image[0], im->image[0], im->linesize);
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memcpy(imOut->image[1], im->image[1], im->linesize);
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if (im->bands == 1) {
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// Add one time for rounding
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offset += 0.5;
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for (y = 2; y < im->ysize-2; y++) {
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UINT8* in_2 = (UINT8*) im->image[y-2];
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UINT8* in_1 = (UINT8*) im->image[y-1];
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UINT8* in0 = (UINT8*) im->image[y];
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UINT8* in1 = (UINT8*) im->image[y+1];
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UINT8* in2 = (UINT8*) im->image[y+2];
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UINT8* out = (UINT8*) imOut->image[y];
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out[0] = in0[0];
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out[1] = in0[1];
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for (x = 2; x < im->xsize-2; x++) {
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float ss = offset;
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ss += KERNEL1x5(in2, x, &kernel[0], 1);
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ss += KERNEL1x5(in1, x, &kernel[5], 1);
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ss += KERNEL1x5(in0, x, &kernel[10], 1);
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ss += KERNEL1x5(in_1, x, &kernel[15], 1);
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ss += KERNEL1x5(in_2, x, &kernel[20], 1);
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out[x] = clip8(ss);
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}
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out[x+0] = in0[x+0];
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out[x+1] = in0[x+1];
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}
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} else {
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// Add one time for rounding
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offset += 0.5;
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for (y = 2; y < im->ysize-2; y++) {
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UINT8* in_2 = (UINT8*) im->image[y-2];
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UINT8* in_1 = (UINT8*) im->image[y-1];
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UINT8* in0 = (UINT8*) im->image[y];
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UINT8* in1 = (UINT8*) im->image[y+1];
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UINT8* in2 = (UINT8*) im->image[y+2];
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UINT32* out = (UINT32*) imOut->image[y];
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out[0] = ((UINT32*) in0)[0];
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out[1] = ((UINT32*) in0)[1];
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if (im->bands == 2) {
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for (x = 2; x < im->xsize-2; x++) {
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float ss0 = offset;
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float ss3 = offset;
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ss0 += KERNEL1x5(in2, x*4+0, &kernel[0], 4);
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ss3 += KERNEL1x5(in2, x*4+3, &kernel[0], 4);
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ss0 += KERNEL1x5(in1, x*4+0, &kernel[5], 4);
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ss3 += KERNEL1x5(in1, x*4+3, &kernel[5], 4);
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ss0 += KERNEL1x5(in0, x*4+0, &kernel[10], 4);
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ss3 += KERNEL1x5(in0, x*4+3, &kernel[10], 4);
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ss0 += KERNEL1x5(in_1, x*4+0, &kernel[15], 4);
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ss3 += KERNEL1x5(in_1, x*4+3, &kernel[15], 4);
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ss0 += KERNEL1x5(in_2, x*4+0, &kernel[20], 4);
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ss3 += KERNEL1x5(in_2, x*4+3, &kernel[20], 4);
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out[x] = MAKE_UINT32(clip8(ss0), 0, 0, clip8(ss3));
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}
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} else if (im->bands == 3) {
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for (x = 2; x < im->xsize-2; x++) {
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float ss0 = offset;
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float ss1 = offset;
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float ss2 = offset;
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ss0 += KERNEL1x5(in2, x*4+0, &kernel[0], 4);
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ss1 += KERNEL1x5(in2, x*4+1, &kernel[0], 4);
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ss2 += KERNEL1x5(in2, x*4+2, &kernel[0], 4);
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ss0 += KERNEL1x5(in1, x*4+0, &kernel[5], 4);
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ss1 += KERNEL1x5(in1, x*4+1, &kernel[5], 4);
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ss2 += KERNEL1x5(in1, x*4+2, &kernel[5], 4);
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ss0 += KERNEL1x5(in0, x*4+0, &kernel[10], 4);
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ss1 += KERNEL1x5(in0, x*4+1, &kernel[10], 4);
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ss2 += KERNEL1x5(in0, x*4+2, &kernel[10], 4);
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ss0 += KERNEL1x5(in_1, x*4+0, &kernel[15], 4);
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ss1 += KERNEL1x5(in_1, x*4+1, &kernel[15], 4);
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ss2 += KERNEL1x5(in_1, x*4+2, &kernel[15], 4);
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ss0 += KERNEL1x5(in_2, x*4+0, &kernel[20], 4);
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ss1 += KERNEL1x5(in_2, x*4+1, &kernel[20], 4);
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ss2 += KERNEL1x5(in_2, x*4+2, &kernel[20], 4);
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out[x] = MAKE_UINT32(
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clip8(ss0), clip8(ss1), clip8(ss2), 0);
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}
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} else if (im->bands == 4) {
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for (x = 2; x < im->xsize-2; x++) {
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float ss0 = offset;
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float ss1 = offset;
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float ss2 = offset;
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float ss3 = offset;
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ss0 += KERNEL1x5(in2, x*4+0, &kernel[0], 4);
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ss1 += KERNEL1x5(in2, x*4+1, &kernel[0], 4);
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ss2 += KERNEL1x5(in2, x*4+2, &kernel[0], 4);
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ss3 += KERNEL1x5(in2, x*4+3, &kernel[0], 4);
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ss0 += KERNEL1x5(in1, x*4+0, &kernel[5], 4);
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ss1 += KERNEL1x5(in1, x*4+1, &kernel[5], 4);
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ss2 += KERNEL1x5(in1, x*4+2, &kernel[5], 4);
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ss3 += KERNEL1x5(in1, x*4+3, &kernel[5], 4);
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ss0 += KERNEL1x5(in0, x*4+0, &kernel[10], 4);
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ss1 += KERNEL1x5(in0, x*4+1, &kernel[10], 4);
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ss2 += KERNEL1x5(in0, x*4+2, &kernel[10], 4);
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ss3 += KERNEL1x5(in0, x*4+3, &kernel[10], 4);
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ss0 += KERNEL1x5(in_1, x*4+0, &kernel[15], 4);
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ss1 += KERNEL1x5(in_1, x*4+1, &kernel[15], 4);
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ss2 += KERNEL1x5(in_1, x*4+2, &kernel[15], 4);
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ss3 += KERNEL1x5(in_1, x*4+3, &kernel[15], 4);
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ss0 += KERNEL1x5(in_2, x*4+0, &kernel[20], 4);
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ss1 += KERNEL1x5(in_2, x*4+1, &kernel[20], 4);
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ss2 += KERNEL1x5(in_2, x*4+2, &kernel[20], 4);
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ss3 += KERNEL1x5(in_2, x*4+3, &kernel[20], 4);
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out[x] = MAKE_UINT32(
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clip8(ss0), clip8(ss1), clip8(ss2), clip8(ss3));
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}
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}
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out[x] = ((UINT32*) in0)[x];
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out[x+1] = ((UINT32*) in0)[x+1];
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}
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}
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memcpy(imOut->image[y], im->image[y], im->linesize);
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memcpy(imOut->image[y+1], im->image[y+1], im->linesize);
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}
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Imaging
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ImagingFilter(Imaging im, int xsize, int ysize, const FLOAT32* kernel,
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FLOAT32 offset)
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{
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Imaging imOut;
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ImagingSectionCookie cookie;
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if ( ! im || im->type != IMAGING_TYPE_UINT8)
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return (Imaging) ImagingError_ModeError();
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if (im->xsize < xsize || im->ysize < ysize)
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return ImagingCopy(im);
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if ((xsize != 3 && xsize != 5) || xsize != ysize)
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return (Imaging) ImagingError_ValueError("bad kernel size");
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imOut = ImagingNewDirty(im->mode, im->xsize, im->ysize);
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if (!imOut)
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return NULL;
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ImagingSectionEnter(&cookie);
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if (xsize == 3) {
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/* 3x3 kernel. */
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ImagingFilter3x3(imOut, im, kernel, offset);
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} else {
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/* 5x5 kernel. */
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ImagingFilter5x5(imOut, im, kernel, offset);
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}
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ImagingSectionLeave(&cookie);
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return imOut;
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}
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