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/**
* libdmtx - Data Matrix Encoding/Decoding Library
* Copyright 2010 Mike Laughton. All rights reserved.
*
* See LICENSE file in the main project directory for full
* terms of use and distribution.
*
* Contact: Mike Laughton <mike@dragonflylogic.com>
*
* \file dmtxsobel.c
*/
#include <SDL/SDL.h>
#include <SDL/SDL_image.h>
#include <assert.h>
#include "../../dmtx.h"
#include "multi_test.h"
/**
*
*
*/
DmtxSobel *
SobelCreate(DmtxImage *img)
{
int sWidth, sHeight;
DmtxSobel *sobel;
sobel = (DmtxSobel *)calloc(1, sizeof(DmtxSobel));
if(sobel == NULL)
return NULL;
sWidth = dmtxImageGetProp(img, DmtxPropWidth) - 2;
sHeight = dmtxImageGetProp(img, DmtxPropHeight) - 2;
sobel->v = dmtxValueGridCreate(sWidth, sHeight, DmtxEdgeVertical, NULL);
sobel->b = dmtxValueGridCreate(sWidth, sHeight, DmtxEdgeBackslash, NULL);
sobel->h = dmtxValueGridCreate(sWidth, sHeight, DmtxEdgeHorizontal, NULL);
sobel->s = dmtxValueGridCreate(sWidth, sHeight, DmtxEdgeSlash, NULL);
if(sobel->v == NULL || sobel->b == NULL || sobel->h == NULL || sobel->s == NULL)
{
SobelDestroy(&sobel);
return NULL;
}
return sobel;
}
/**
*
*
*/
DmtxPassFail
SobelDestroy(DmtxSobel **sobel)
{
if(sobel == NULL || *sobel == NULL)
return DmtxFail;
dmtxValueGridDestroy(&((*sobel)->s));
dmtxValueGridDestroy(&((*sobel)->h));
dmtxValueGridDestroy(&((*sobel)->b));
dmtxValueGridDestroy(&((*sobel)->v));
free(*sobel);
*sobel = NULL;
return DmtxPass;
}
/**
* 3x3 Sobel Kernel
*
*/
DmtxPassFail
SobelPopulate(DmtxDecode2 *dec)
{
int bytesPerPixel, rowSizeBytes, colorPlane;
int sx, sy;
int py, pOffset;
int vMag, bMag, hMag, sMag;
int colorLoLf, colorLoMd, colorLoRt;
int colorMdRt, colorHiRt, colorHiMd;
int colorHiLf, colorMdLf, colorMdMd;
int idx;
int sWidth, sHeight;
DmtxSobel *sobel = dec->sobel;
DmtxImage *img = dec->image;
assert(dec != NULL);
sobel = dec->sobel;
img = dec->image;
assert(sobel != NULL && img != NULL);
sWidth = dmtxImageGetProp(img, DmtxPropWidth) - 2;
sHeight = dmtxImageGetProp(img, DmtxPropHeight) - 2;
rowSizeBytes = dmtxImageGetProp(img, DmtxPropRowSizeBytes);
bytesPerPixel = dmtxImageGetProp(img, DmtxPropBytesPerPixel);
colorPlane = 1; /* XXX need to make some decisions here */
for(sy = 0; sy < sHeight; sy++)
{
py = sHeight - sy;
pOffset = py * rowSizeBytes + colorPlane;
colorHiLf = img->pxl[pOffset - rowSizeBytes];
colorMdLf = img->pxl[pOffset];
colorLoLf = img->pxl[pOffset + rowSizeBytes];
pOffset += bytesPerPixel;
colorHiMd = img->pxl[pOffset - rowSizeBytes];
colorMdMd = img->pxl[pOffset];
colorLoMd = img->pxl[pOffset + rowSizeBytes];
pOffset += bytesPerPixel;
colorHiRt = img->pxl[pOffset - rowSizeBytes];
colorMdRt = img->pxl[pOffset];
colorLoRt = img->pxl[pOffset + rowSizeBytes];
for(sx = 0; sx < sWidth; sx++)
{
/**
* -1 0 1
* -2 0 2
* -1 0 1
*/
vMag = colorHiRt;
vMag += colorMdRt * 2;
vMag += colorLoRt;
vMag -= colorHiLf;
vMag -= colorMdLf * 2;
vMag -= colorLoLf;
/**
* 0 1 2
* -1 0 1
* -2 -1 0
*/
bMag = colorMdLf;
bMag += colorLoLf * 2;
bMag += colorLoMd;
bMag -= colorMdRt;
bMag -= colorHiRt * 2;
bMag -= colorHiMd;
/**
* 1 2 1
* 0 0 0
* -1 -2 -1
*/
hMag = colorHiLf;
hMag += colorHiMd * 2;
hMag += colorHiRt;
hMag -= colorLoLf;
hMag -= colorLoMd * 2;
hMag -= colorLoRt;
/**
* -2 -1 0
* -1 0 1
* 0 1 2
*/
sMag = colorLoMd;
sMag += colorLoRt * 2;
sMag += colorMdRt;
sMag -= colorHiMd;
sMag -= colorHiLf * 2;
sMag -= colorMdLf;
/**
* If implementing these operations using MMX, can load 2
* registers with 4 doubleword values and subtract (PSUBD).
*/
idx = sy * sWidth + sx;
sobel->v->value[idx] = vMag;
sobel->b->value[idx] = bMag;
sobel->h->value[idx] = hMag;
sobel->s->value[idx] = sMag;
colorHiLf = colorHiMd;
colorMdLf = colorMdMd;
colorLoLf = colorLoMd;
colorHiMd = colorHiRt;
colorMdMd = colorMdRt;
colorLoMd = colorLoRt;
pOffset += bytesPerPixel;
colorHiRt = img->pxl[pOffset - rowSizeBytes];
colorMdRt = img->pxl[pOffset];
colorLoRt = img->pxl[pOffset + rowSizeBytes];
}
}
dec->fn.dmtxValueGridCallback(sobel->v, 0);
dec->fn.dmtxValueGridCallback(sobel->b, 1);
dec->fn.dmtxValueGridCallback(sobel->h, 2);
dec->fn.dmtxValueGridCallback(sobel->s, 3);
return DmtxPass;
}
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