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twain3.0/3rdparty/hgOCR/leptonica/fpix2.c

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2021-11-20 06:24:33 +00:00
/*====================================================================*
- Copyright (C) 2001 Leptonica. All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- 2. Redistributions in binary form must reproduce the above
- copyright notice, this list of conditions and the following
- disclaimer in the documentation and/or other materials
- provided with the distribution.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ANY
- CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*====================================================================*/
/*!
* \file fpix2.c
* <pre>
*
* ------------------------------------------
* This file has these FPix utilities:
* ~ interconversions with pix, fpix, dpix
* ~ min and max values
* ~ integer scaling
* ~ arithmetic operations
* ~ set all
* ~ border functions
* ~ simple rasterop (source --> dest)
* ~ geometric transforms
* ------------------------------------------
*
* Interconversions between Pix, FPix and DPix
* FPIX *pixConvertToFPix()
* DPIX *pixConvertToDPix()
* PIX *fpixConvertToPix()
* PIX *fpixDisplayMaxDynamicRange() [useful for debugging]
* DPIX *fpixConvertToDPix()
* PIX *dpixConvertToPix()
* FPIX *dpixConvertToFPix()
*
* Min/max value
* l_int32 fpixGetMin()
* l_int32 fpixGetMax()
* l_int32 dpixGetMin()
* l_int32 dpixGetMax()
*
* Integer scaling
* FPIX *fpixScaleByInteger()
* DPIX *dpixScaleByInteger()
*
* Arithmetic operations
* FPIX *fpixLinearCombination()
* l_int32 fpixAddMultConstant()
* DPIX *dpixLinearCombination()
* l_int32 dpixAddMultConstant()
*
* Set all
* l_int32 fpixSetAllArbitrary()
* l_int32 dpixSetAllArbitrary()
*
* FPix border functions
* FPIX *fpixAddBorder()
* FPIX *fpixRemoveBorder()
* FPIX *fpixAddMirroredBorder()
* FPIX *fpixAddContinuedBorder()
* FPIX *fpixAddSlopeBorder()
*
* FPix simple rasterop
* l_int32 fpixRasterop()
*
* FPix rotation by multiples of 90 degrees
* FPIX *fpixRotateOrth()
* FPIX *fpixRotate180()
* FPIX *fpixRotate90()
* FPIX *fpixFlipLR()
* FPIX *fpixFlipTB()
*
* FPix affine and projective interpolated transforms
* FPIX *fpixAffinePta()
* FPIX *fpixAffine()
* FPIX *fpixProjectivePta()
* FPIX *fpixProjective()
* l_int32 linearInterpolatePixelFloat()
*
* Thresholding to 1 bpp Pix
* PIX *fpixThresholdToPix()
*
* Generate function from components
* FPIX *pixComponentFunction()
* </pre>
*/
#include <string.h>
#include "allheaders.h"
/*--------------------------------------------------------------------*
* FPix <--> Pix conversions *
*--------------------------------------------------------------------*/
/*!
* \brief pixConvertToFPix()
*
* \param[in] pixs 1, 2, 4, 8, 16 or 32 bpp
* \param[in] ncomps number of components: 3 for RGB, 1 otherwise
* \return fpix, or NULL on error
*
* <pre>
* Notes:
* (1) If colormapped, remove to grayscale.
* (2) If 32 bpp and %ncomps == 3, this is RGB; convert to luminance.
* In all other cases the src image is treated as having a single
* component of pixel values.
* </pre>
*/
FPIX *
pixConvertToFPix(PIX *pixs,
l_int32 ncomps)
{
l_int32 w, h, d, i, j, val, wplt, wpld;
l_uint32 uval;
l_uint32 *datat, *linet;
l_float32 *datad, *lined;
PIX *pixt;
FPIX *fpixd;
PROCNAME("pixConvertToFPix");
if (!pixs)
return (FPIX *)ERROR_PTR("pixs not defined", procName, NULL);
/* Convert to a single component */
if (pixGetColormap(pixs))
pixt = pixRemoveColormap(pixs, REMOVE_CMAP_TO_GRAYSCALE);
else if (pixGetDepth(pixs) == 32 && ncomps == 3)
pixt = pixConvertRGBToLuminance(pixs);
else
pixt = pixClone(pixs);
pixGetDimensions(pixt, &w, &h, &d);
if (d != 1 && d != 2 && d != 4 && d != 8 && d != 16 && d != 32) {
pixDestroy(&pixt);
return (FPIX *)ERROR_PTR("invalid depth", procName, NULL);
}
if ((fpixd = fpixCreate(w, h)) == NULL) {
pixDestroy(&pixt);
return (FPIX *)ERROR_PTR("fpixd not made", procName, NULL);
}
datat = pixGetData(pixt);
wplt = pixGetWpl(pixt);
datad = fpixGetData(fpixd);
wpld = fpixGetWpl(fpixd);
for (i = 0; i < h; i++) {
linet = datat + i * wplt;
lined = datad + i * wpld;
if (d == 1) {
for (j = 0; j < w; j++) {
val = GET_DATA_BIT(linet, j);
lined[j] = (l_float32)val;
}
} else if (d == 2) {
for (j = 0; j < w; j++) {
val = GET_DATA_DIBIT(linet, j);
lined[j] = (l_float32)val;
}
} else if (d == 4) {
for (j = 0; j < w; j++) {
val = GET_DATA_QBIT(linet, j);
lined[j] = (l_float32)val;
}
} else if (d == 8) {
for (j = 0; j < w; j++) {
val = GET_DATA_BYTE(linet, j);
lined[j] = (l_float32)val;
}
} else if (d == 16) {
for (j = 0; j < w; j++) {
val = GET_DATA_TWO_BYTES(linet, j);
lined[j] = (l_float32)val;
}
} else { /* d == 32 */
for (j = 0; j < w; j++) {
uval = GET_DATA_FOUR_BYTES(linet, j);
lined[j] = (l_float32)uval;
}
}
}
pixDestroy(&pixt);
return fpixd;
}
/*!
* \brief pixConvertToDPix()
*
* \param[in] pixs 1, 2, 4, 8, 16 or 32 bpp
* \param[in] ncomps number of components: 3 for RGB, 1 otherwise
* \return dpix, or NULL on error
*
* <pre>
* Notes:
* (1) If colormapped, remove to grayscale.
* (2) If 32 bpp and %ncomps == 3, this is RGB; convert to luminance.
* In all other cases the src image is treated as having a single
* component of pixel values.
* </pre>
*/
DPIX *
pixConvertToDPix(PIX *pixs,
l_int32 ncomps)
{
l_int32 w, h, d, i, j, val, wplt, wpld;
l_uint32 uval;
l_uint32 *datat, *linet;
l_float64 *datad, *lined;
PIX *pixt;
DPIX *dpixd;
PROCNAME("pixConvertToDPix");
if (!pixs)
return (DPIX *)ERROR_PTR("pixs not defined", procName, NULL);
/* Convert to a single component */
if (pixGetColormap(pixs))
pixt = pixRemoveColormap(pixs, REMOVE_CMAP_TO_GRAYSCALE);
else if (pixGetDepth(pixs) == 32 && ncomps == 3)
pixt = pixConvertRGBToLuminance(pixs);
else
pixt = pixClone(pixs);
pixGetDimensions(pixt, &w, &h, &d);
if (d != 1 && d != 2 && d != 4 && d != 8 && d != 16 && d != 32) {
pixDestroy(&pixt);
return (DPIX *)ERROR_PTR("invalid depth", procName, NULL);
}
if ((dpixd = dpixCreate(w, h)) == NULL) {
pixDestroy(&pixt);
return (DPIX *)ERROR_PTR("dpixd not made", procName, NULL);
}
datat = pixGetData(pixt);
wplt = pixGetWpl(pixt);
datad = dpixGetData(dpixd);
wpld = dpixGetWpl(dpixd);
for (i = 0; i < h; i++) {
linet = datat + i * wplt;
lined = datad + i * wpld;
if (d == 1) {
for (j = 0; j < w; j++) {
val = GET_DATA_BIT(linet, j);
lined[j] = (l_float64)val;
}
} else if (d == 2) {
for (j = 0; j < w; j++) {
val = GET_DATA_DIBIT(linet, j);
lined[j] = (l_float64)val;
}
} else if (d == 4) {
for (j = 0; j < w; j++) {
val = GET_DATA_QBIT(linet, j);
lined[j] = (l_float64)val;
}
} else if (d == 8) {
for (j = 0; j < w; j++) {
val = GET_DATA_BYTE(linet, j);
lined[j] = (l_float64)val;
}
} else if (d == 16) {
for (j = 0; j < w; j++) {
val = GET_DATA_TWO_BYTES(linet, j);
lined[j] = (l_float64)val;
}
} else { /* d == 32 */
for (j = 0; j < w; j++) {
uval = GET_DATA_FOUR_BYTES(linet, j);
lined[j] = (l_float64)uval;
}
}
}
pixDestroy(&pixt);
return dpixd;
}
/*!
* \brief fpixConvertToPix()
*
* \param[in] fpixs
* \param[in] outdepth 0, 8, 16 or 32 bpp
* \param[in] negvals L_CLIP_TO_ZERO, L_TAKE_ABSVAL
* \param[in] errorflag 1 to output error stats; 0 otherwise
* \return pixd, or NULL on error
*
* <pre>
* Notes:
* (1) Use %outdepth = 0 to programmatically determine the
* output depth. If no values are greater than 255,
* it will set outdepth = 8; otherwise to 16 or 32.
* (2) Because we are converting a float to an unsigned int
* with a specified dynamic range (8, 16 or 32 bits), errors
* can occur. If errorflag == TRUE, output the number
* of values out of range, both negative and positive.
* (3) If a pixel value is positive and out of range, clip to
* the maximum value represented at the outdepth of 8, 16
* or 32 bits.
* </pre>
*/
PIX *
fpixConvertToPix(FPIX *fpixs,
l_int32 outdepth,
l_int32 negvals,
l_int32 errorflag)
{
l_int32 w, h, i, j, wpls, wpld;
l_uint32 vald, maxval;
l_float32 val;
l_float32 *datas, *lines;
l_uint32 *datad, *lined;
PIX *pixd;
PROCNAME("fpixConvertToPix");
if (!fpixs)
return (PIX *)ERROR_PTR("fpixs not defined", procName, NULL);
if (negvals != L_CLIP_TO_ZERO && negvals != L_TAKE_ABSVAL)
return (PIX *)ERROR_PTR("invalid negvals", procName, NULL);
if (outdepth != 0 && outdepth != 8 && outdepth != 16 && outdepth != 32)
return (PIX *)ERROR_PTR("outdepth not in {0,8,16,32}", procName, NULL);
fpixGetDimensions(fpixs, &w, &h);
datas = fpixGetData(fpixs);
wpls = fpixGetWpl(fpixs);
/* Adaptive determination of output depth */
if (outdepth == 0) {
outdepth = 8;
for (i = 0; i < h && outdepth < 32; i++) {
lines = datas + i * wpls;
for (j = 0; j < w && outdepth < 32; j++) {
if (lines[j] > 65535.5)
outdepth = 32;
else if (lines[j] > 255.5)
outdepth = 16;
}
}
}
if (outdepth == 8)
maxval = 0xff;
else if (outdepth == 16)
maxval = 0xffff;
else /* outdepth == 32 */
maxval = 0xffffffff;
/* Gather statistics if %errorflag = TRUE */
if (errorflag) {
l_int32 negs = 0;
l_int32 overvals = 0;
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
for (j = 0; j < w; j++) {
val = lines[j];
if (val < 0.0)
negs++;
else if (val > maxval)
overvals++;
}
}
if (negs > 0)
L_ERROR("Number of negative values: %d\n", procName, negs);
if (overvals > 0)
L_ERROR("Number of too-large values: %d\n", procName, overvals);
}
/* Make the pix and convert the data */
if ((pixd = pixCreate(w, h, outdepth)) == NULL)
return (PIX *)ERROR_PTR("pixd not made", procName, NULL);
datad = pixGetData(pixd);
wpld = pixGetWpl(pixd);
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
for (j = 0; j < w; j++) {
val = lines[j];
if (val >= 0.0)
vald = (l_uint32)(val + 0.5);
else if (negvals == L_CLIP_TO_ZERO) /* and val < 0.0 */
vald = 0;
else
vald = (l_uint32)(-val + 0.5);
if (vald > maxval)
vald = maxval;
if (outdepth == 8)
SET_DATA_BYTE(lined, j, vald);
else if (outdepth == 16)
SET_DATA_TWO_BYTES(lined, j, vald);
else /* outdepth == 32 */
SET_DATA_FOUR_BYTES(lined, j, vald);
}
}
return pixd;
}
/*!
* \brief fpixDisplayMaxDynamicRange()
*
* \param[in] fpixs
* \return pixd 8 bpp, or NULL on error
*/
PIX *
fpixDisplayMaxDynamicRange(FPIX *fpixs)
{
l_uint8 dval;
l_int32 i, j, w, h, wpls, wpld;
l_float32 factor, sval, maxval;
l_float32 *lines, *datas;
l_uint32 *lined, *datad;
PIX *pixd;
PROCNAME("fpixDisplayMaxDynamicRange");
if (!fpixs)
return (PIX *)ERROR_PTR("fpixs not defined", procName, NULL);
fpixGetDimensions(fpixs, &w, &h);
datas = fpixGetData(fpixs);
wpls = fpixGetWpl(fpixs);
maxval = 0.0;
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
for (j = 0; j < w; j++) {
sval = *(lines + j);
if (sval > maxval)
maxval = sval;
}
}
pixd = pixCreate(w, h, 8);
if (maxval == 0.0)
return pixd; /* all pixels are 0 */
datad = pixGetData(pixd);
wpld = pixGetWpl(pixd);
factor = 255. / maxval;
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
for (j = 0; j < w; j++) {
sval = *(lines + j);
if (sval < 0.0) sval = 0.0;
dval = (l_uint8)(factor * sval + 0.5);
SET_DATA_BYTE(lined, j, dval);
}
}
return pixd;
}
/*!
* \brief fpixConvertToDPix()
*
* \param[in] fpix
* \return dpix, or NULL on error
*/
DPIX *
fpixConvertToDPix(FPIX *fpix)
{
l_int32 w, h, i, j, wpls, wpld;
l_float32 val;
l_float32 *datas, *lines;
l_float64 *datad, *lined;
DPIX *dpix;
PROCNAME("fpixConvertToDPix");
if (!fpix)
return (DPIX *)ERROR_PTR("fpix not defined", procName, NULL);
fpixGetDimensions(fpix, &w, &h);
if ((dpix = dpixCreate(w, h)) == NULL)
return (DPIX *)ERROR_PTR("dpix not made", procName, NULL);
datas = fpixGetData(fpix);
datad = dpixGetData(dpix);
wpls = fpixGetWpl(fpix);
wpld = dpixGetWpl(dpix); /* 8 byte words */
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
for (j = 0; j < w; j++) {
val = lines[j];
lined[j] = val;
}
}
return dpix;
}
/*!
* \brief dpixConvertToPix()
*
* \param[in] dpixs
* \param[in] outdepth 0, 8, 16 or 32 bpp
* \param[in] negvals L_CLIP_TO_ZERO, L_TAKE_ABSVAL
* \param[in] errorflag 1 to output error stats; 0 otherwise
* \return pixd, or NULL on error
*
* <pre>
* Notes:
* (1) Use %outdepth = 0 to programmatically determine the
* output depth. If no values are greater than 255,
* it will set outdepth = 8; otherwise to 16 or 32.
* (2) Because we are converting a float to an unsigned int
* with a specified dynamic range (8, 16 or 32 bits), errors
* can occur. If errorflag == TRUE, output the number
* of values out of range, both negative and positive.
* (3) If a pixel value is positive and out of range, clip to
* the maximum value represented at the outdepth of 8, 16
* or 32 bits.
* </pre>
*/
PIX *
dpixConvertToPix(DPIX *dpixs,
l_int32 outdepth,
l_int32 negvals,
l_int32 errorflag)
{
l_int32 w, h, i, j, wpls, wpld, maxval;
l_uint32 vald;
l_float64 val;
l_float64 *datas, *lines;
l_uint32 *datad, *lined;
PIX *pixd;
PROCNAME("dpixConvertToPix");
if (!dpixs)
return (PIX *)ERROR_PTR("dpixs not defined", procName, NULL);
if (negvals != L_CLIP_TO_ZERO && negvals != L_TAKE_ABSVAL)
return (PIX *)ERROR_PTR("invalid negvals", procName, NULL);
if (outdepth != 0 && outdepth != 8 && outdepth != 16 && outdepth != 32)
return (PIX *)ERROR_PTR("outdepth not in {0,8,16,32}", procName, NULL);
dpixGetDimensions(dpixs, &w, &h);
datas = dpixGetData(dpixs);
wpls = dpixGetWpl(dpixs);
/* Adaptive determination of output depth */
if (outdepth == 0) {
outdepth = 8;
for (i = 0; i < h && outdepth < 32; i++) {
lines = datas + i * wpls;
for (j = 0; j < w && outdepth < 32; j++) {
if (lines[j] > 65535.5)
outdepth = 32;
else if (lines[j] > 255.5)
outdepth = 16;
}
}
}
maxval = 0xff;
if (outdepth == 16)
maxval = 0xffff;
else /* outdepth == 32 */
maxval = 0xffffffff;
/* Gather statistics if %errorflag = TRUE */
if (errorflag) {
l_int32 negs = 0;
l_int32 overvals = 0;
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
for (j = 0; j < w; j++) {
val = lines[j];
if (val < 0.0)
negs++;
else if (val > maxval)
overvals++;
}
}
if (negs > 0)
L_ERROR("Number of negative values: %d\n", procName, negs);
if (overvals > 0)
L_ERROR("Number of too-large values: %d\n", procName, overvals);
}
/* Make the pix and convert the data */
if ((pixd = pixCreate(w, h, outdepth)) == NULL)
return (PIX *)ERROR_PTR("pixd not made", procName, NULL);
datad = pixGetData(pixd);
wpld = pixGetWpl(pixd);
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
for (j = 0; j < w; j++) {
val = lines[j];
if (val >= 0.0) {
vald = (l_uint32)(val + 0.5);
} else { /* val < 0.0 */
if (negvals == L_CLIP_TO_ZERO)
vald = 0;
else
vald = (l_uint32)(-val + 0.5);
}
if (vald > maxval)
vald = maxval;
if (outdepth == 8)
SET_DATA_BYTE(lined, j, vald);
else if (outdepth == 16)
SET_DATA_TWO_BYTES(lined, j, vald);
else /* outdepth == 32 */
SET_DATA_FOUR_BYTES(lined, j, vald);
}
}
return pixd;
}
/*!
* \brief dpixConvertToFPix()
*
* \param[in] dpix
* \return fpix, or NULL on error
*/
FPIX *
dpixConvertToFPix(DPIX *dpix)
{
l_int32 w, h, i, j, wpls, wpld;
l_float64 val;
l_float32 *datad, *lined;
l_float64 *datas, *lines;
FPIX *fpix;
PROCNAME("dpixConvertToFPix");
if (!dpix)
return (FPIX *)ERROR_PTR("dpix not defined", procName, NULL);
dpixGetDimensions(dpix, &w, &h);
if ((fpix = fpixCreate(w, h)) == NULL)
return (FPIX *)ERROR_PTR("fpix not made", procName, NULL);
datas = dpixGetData(dpix);
datad = fpixGetData(fpix);
wpls = dpixGetWpl(dpix); /* 8 byte words */
wpld = fpixGetWpl(fpix);
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
for (j = 0; j < w; j++) {
val = lines[j];
lined[j] = (l_float32)val;
}
}
return fpix;
}
/*--------------------------------------------------------------------*
* Min/max value *
*--------------------------------------------------------------------*/
/*!
* \brief fpixGetMin()
*
* \param[in] fpix
* \param[out] pminval [optional] min value
* \param[out] pxminloc [optional] x location of min
* \param[out] pyminloc [optional] y location of min
* \return 0 if OK; 1 on error
*/
l_ok
fpixGetMin(FPIX *fpix,
l_float32 *pminval,
l_int32 *pxminloc,
l_int32 *pyminloc)
{
l_int32 i, j, w, h, wpl, xminloc, yminloc;
l_float32 *data, *line;
l_float32 minval;
PROCNAME("fpixGetMin");
if (!pminval && !pxminloc && !pyminloc)
return ERROR_INT("no return val requested", procName, 1);
if (pminval) *pminval = 0.0;
if (pxminloc) *pxminloc = 0;
if (pyminloc) *pyminloc = 0;
if (!fpix)
return ERROR_INT("fpix not defined", procName, 1);
minval = +1.0e20;
xminloc = 0;
yminloc = 0;
fpixGetDimensions(fpix, &w, &h);
data = fpixGetData(fpix);
wpl = fpixGetWpl(fpix);
for (i = 0; i < h; i++) {
line = data + i * wpl;
for (j = 0; j < w; j++) {
if (line[j] < minval) {
minval = line[j];
xminloc = j;
yminloc = i;
}
}
}
if (pminval) *pminval = minval;
if (pxminloc) *pxminloc = xminloc;
if (pyminloc) *pyminloc = yminloc;
return 0;
}
/*!
* \brief fpixGetMax()
*
* \param[in] fpix
* \param[out] pmaxval [optional] max value
* \param[out] pxmaxloc [optional] x location of max
* \param[out] pymaxloc [optional] y location of max
* \return 0 if OK; 1 on error
*/
l_ok
fpixGetMax(FPIX *fpix,
l_float32 *pmaxval,
l_int32 *pxmaxloc,
l_int32 *pymaxloc)
{
l_int32 i, j, w, h, wpl, xmaxloc, ymaxloc;
l_float32 *data, *line;
l_float32 maxval;
PROCNAME("fpixGetMax");
if (!pmaxval && !pxmaxloc && !pymaxloc)
return ERROR_INT("no return val requested", procName, 1);
if (pmaxval) *pmaxval = 0.0;
if (pxmaxloc) *pxmaxloc = 0;
if (pymaxloc) *pymaxloc = 0;
if (!fpix)
return ERROR_INT("fpix not defined", procName, 1);
maxval = -1.0e20;
xmaxloc = 0;
ymaxloc = 0;
fpixGetDimensions(fpix, &w, &h);
data = fpixGetData(fpix);
wpl = fpixGetWpl(fpix);
for (i = 0; i < h; i++) {
line = data + i * wpl;
for (j = 0; j < w; j++) {
if (line[j] > maxval) {
maxval = line[j];
xmaxloc = j;
ymaxloc = i;
}
}
}
if (pmaxval) *pmaxval = maxval;
if (pxmaxloc) *pxmaxloc = xmaxloc;
if (pymaxloc) *pymaxloc = ymaxloc;
return 0;
}
/*!
* \brief dpixGetMin()
*
* \param[in] dpix
* \param[out] pminval [optional] min value
* \param[out] pxminloc [optional] x location of min
* \param[out] pyminloc [optional] y location of min
* \return 0 if OK; 1 on error
*/
l_ok
dpixGetMin(DPIX *dpix,
l_float64 *pminval,
l_int32 *pxminloc,
l_int32 *pyminloc)
{
l_int32 i, j, w, h, wpl, xminloc, yminloc;
l_float64 *data, *line;
l_float64 minval;
PROCNAME("dpixGetMin");
if (!pminval && !pxminloc && !pyminloc)
return ERROR_INT("no return val requested", procName, 1);
if (pminval) *pminval = 0.0;
if (pxminloc) *pxminloc = 0;
if (pyminloc) *pyminloc = 0;
if (!dpix)
return ERROR_INT("dpix not defined", procName, 1);
minval = +1.0e300;
xminloc = 0;
yminloc = 0;
dpixGetDimensions(dpix, &w, &h);
data = dpixGetData(dpix);
wpl = dpixGetWpl(dpix);
for (i = 0; i < h; i++) {
line = data + i * wpl;
for (j = 0; j < w; j++) {
if (line[j] < minval) {
minval = line[j];
xminloc = j;
yminloc = i;
}
}
}
if (pminval) *pminval = minval;
if (pxminloc) *pxminloc = xminloc;
if (pyminloc) *pyminloc = yminloc;
return 0;
}
/*!
* \brief dpixGetMax()
*
* \param[in] dpix
* \param[out] pmaxval [optional] max value
* \param[out] pxmaxloc [optional] x location of max
* \param[out] pymaxloc [optional] y location of max
* \return 0 if OK; 1 on error
*/
l_ok
dpixGetMax(DPIX *dpix,
l_float64 *pmaxval,
l_int32 *pxmaxloc,
l_int32 *pymaxloc)
{
l_int32 i, j, w, h, wpl, xmaxloc, ymaxloc;
l_float64 *data, *line;
l_float64 maxval;
PROCNAME("dpixGetMax");
if (!pmaxval && !pxmaxloc && !pymaxloc)
return ERROR_INT("no return val requested", procName, 1);
if (pmaxval) *pmaxval = 0.0;
if (pxmaxloc) *pxmaxloc = 0;
if (pymaxloc) *pymaxloc = 0;
if (!dpix)
return ERROR_INT("dpix not defined", procName, 1);
maxval = -1.0e20;
xmaxloc = 0;
ymaxloc = 0;
dpixGetDimensions(dpix, &w, &h);
data = dpixGetData(dpix);
wpl = dpixGetWpl(dpix);
for (i = 0; i < h; i++) {
line = data + i * wpl;
for (j = 0; j < w; j++) {
if (line[j] > maxval) {
maxval = line[j];
xmaxloc = j;
ymaxloc = i;
}
}
}
if (pmaxval) *pmaxval = maxval;
if (pxmaxloc) *pxmaxloc = xmaxloc;
if (pymaxloc) *pymaxloc = ymaxloc;
return 0;
}
/*--------------------------------------------------------------------*
* Special integer scaling *
*--------------------------------------------------------------------*/
/*!
* \brief fpixScaleByInteger()
*
* \param[in] fpixs typically low resolution
* \param[in] factor integer scaling factor
* \return fpixd interpolated result, or NULL on error
*
* <pre>
* Notes:
* (1) The width wd of fpixd is related to ws of fpixs by:
* wd = factor * (ws - 1) + 1 (and ditto for the height)
* We avoid special-casing boundary pixels in the interpolation
* by constructing fpixd by inserting (factor - 1) interpolated
* pixels between each pixel in fpixs. Then
* wd = ws + (ws - 1) * (factor - 1) (same as above)
* This also has the advantage that if we subsample by %factor,
* throwing out all the interpolated pixels, we regain the
* original low resolution fpix.
* </pre>
*/
FPIX *
fpixScaleByInteger(FPIX *fpixs,
l_int32 factor)
{
l_int32 i, j, k, m, ws, hs, wd, hd, wpls, wpld;
l_float32 val0, val1, val2, val3;
l_float32 *datas, *datad, *lines, *lined, *fract;
FPIX *fpixd;
PROCNAME("fpixScaleByInteger");
if (!fpixs)
return (FPIX *)ERROR_PTR("fpixs not defined", procName, NULL);
fpixGetDimensions(fpixs, &ws, &hs);
wd = factor * (ws - 1) + 1;
hd = factor * (hs - 1) + 1;
fpixd = fpixCreate(wd, hd);
datas = fpixGetData(fpixs);
datad = fpixGetData(fpixd);
wpls = fpixGetWpl(fpixs);
wpld = fpixGetWpl(fpixd);
fract = (l_float32 *)LEPT_CALLOC(factor, sizeof(l_float32));
for (i = 0; i < factor; i++)
fract[i] = i / (l_float32)factor;
for (i = 0; i < hs - 1; i++) {
lines = datas + i * wpls;
for (j = 0; j < ws - 1; j++) {
val0 = lines[j];
val1 = lines[j + 1];
val2 = lines[wpls + j];
val3 = lines[wpls + j + 1];
for (k = 0; k < factor; k++) { /* rows of sub-block */
lined = datad + (i * factor + k) * wpld;
for (m = 0; m < factor; m++) { /* cols of sub-block */
lined[j * factor + m] =
val0 * (1.0 - fract[m]) * (1.0 - fract[k]) +
val1 * fract[m] * (1.0 - fract[k]) +
val2 * (1.0 - fract[m]) * fract[k] +
val3 * fract[m] * fract[k];
}
}
}
}
/* Do the right-most column of fpixd, skipping LR corner */
for (i = 0; i < hs - 1; i++) {
lines = datas + i * wpls;
val0 = lines[ws - 1];
val1 = lines[wpls + ws - 1];
for (k = 0; k < factor; k++) {
lined = datad + (i * factor + k) * wpld;
lined[wd - 1] = val0 * (1.0 - fract[k]) + val1 * fract[k];
}
}
/* Do the bottom-most row of fpixd */
lines = datas + (hs - 1) * wpls;
lined = datad + (hd - 1) * wpld;
for (j = 0; j < ws - 1; j++) {
val0 = lines[j];
val1 = lines[j + 1];
for (m = 0; m < factor; m++)
lined[j * factor + m] = val0 * (1.0 - fract[m]) + val1 * fract[m];
lined[wd - 1] = lines[ws - 1]; /* LR corner */
}
LEPT_FREE(fract);
return fpixd;
}
/*!
* \brief dpixScaleByInteger()
*
* \param[in] dpixs typically low resolution
* \param[in] factor integer scaling factor
* \return dpixd interpolated result, or NULL on error
*
* <pre>
* Notes:
* (1) The width wd of dpixd is related to ws of dpixs by:
* wd = factor * (ws - 1) + 1 (and ditto for the height)
* We avoid special-casing boundary pixels in the interpolation
* by constructing fpixd by inserting (factor - 1) interpolated
* pixels between each pixel in fpixs. Then
* wd = ws + (ws - 1) * (factor - 1) (same as above)
* This also has the advantage that if we subsample by %factor,
* throwing out all the interpolated pixels, we regain the
* original low resolution dpix.
* </pre>
*/
DPIX *
dpixScaleByInteger(DPIX *dpixs,
l_int32 factor)
{
l_int32 i, j, k, m, ws, hs, wd, hd, wpls, wpld;
l_float64 val0, val1, val2, val3;
l_float64 *datas, *datad, *lines, *lined, *fract;
DPIX *dpixd;
PROCNAME("dpixScaleByInteger");
if (!dpixs)
return (DPIX *)ERROR_PTR("dpixs not defined", procName, NULL);
dpixGetDimensions(dpixs, &ws, &hs);
wd = factor * (ws - 1) + 1;
hd = factor * (hs - 1) + 1;
dpixd = dpixCreate(wd, hd);
datas = dpixGetData(dpixs);
datad = dpixGetData(dpixd);
wpls = dpixGetWpl(dpixs);
wpld = dpixGetWpl(dpixd);
fract = (l_float64 *)LEPT_CALLOC(factor, sizeof(l_float64));
for (i = 0; i < factor; i++)
fract[i] = i / (l_float64)factor;
for (i = 0; i < hs - 1; i++) {
lines = datas + i * wpls;
for (j = 0; j < ws - 1; j++) {
val0 = lines[j];
val1 = lines[j + 1];
val2 = lines[wpls + j];
val3 = lines[wpls + j + 1];
for (k = 0; k < factor; k++) { /* rows of sub-block */
lined = datad + (i * factor + k) * wpld;
for (m = 0; m < factor; m++) { /* cols of sub-block */
lined[j * factor + m] =
val0 * (1.0 - fract[m]) * (1.0 - fract[k]) +
val1 * fract[m] * (1.0 - fract[k]) +
val2 * (1.0 - fract[m]) * fract[k] +
val3 * fract[m] * fract[k];
}
}
}
}
/* Do the right-most column of dpixd, skipping LR corner */
for (i = 0; i < hs - 1; i++) {
lines = datas + i * wpls;
val0 = lines[ws - 1];
val1 = lines[wpls + ws - 1];
for (k = 0; k < factor; k++) {
lined = datad + (i * factor + k) * wpld;
lined[wd - 1] = val0 * (1.0 - fract[k]) + val1 * fract[k];
}
}
/* Do the bottom-most row of dpixd */
lines = datas + (hs - 1) * wpls;
lined = datad + (hd - 1) * wpld;
for (j = 0; j < ws - 1; j++) {
val0 = lines[j];
val1 = lines[j + 1];
for (m = 0; m < factor; m++)
lined[j * factor + m] = val0 * (1.0 - fract[m]) + val1 * fract[m];
lined[wd - 1] = lines[ws - 1]; /* LR corner */
}
LEPT_FREE(fract);
return dpixd;
}
/*--------------------------------------------------------------------*
* Arithmetic operations *
*--------------------------------------------------------------------*/
/*!
* \brief fpixLinearCombination()
*
* \param[in] fpixd [optional] this can be null, equal to fpixs1, or
* different from fpixs1
* \param[in] fpixs1 can be equal to fpixd
* \param[in] fpixs2
* \param[in] a, b multiplication factors on fpixs1 and fpixs2, rsp.
* \return fpixd always
*
* <pre>
* Notes:
* (1) Computes pixelwise linear combination: a * src1 + b * src2
* (2) Alignment is to UL corner.
* (3) There are 3 cases. The result can go to a new dest,
* in-place to fpixs1, or to an existing input dest:
* * fpixd == null: (src1 + src2) --> new fpixd
* * fpixd == fpixs1: (src1 + src2) --> src1 (in-place)
* * fpixd != fpixs1: (src1 + src2) --> input fpixd
* (4) fpixs2 must be different from both fpixd and fpixs1.
* </pre>
*/
FPIX *
fpixLinearCombination(FPIX *fpixd,
FPIX *fpixs1,
FPIX *fpixs2,
l_float32 a,
l_float32 b)
{
l_int32 i, j, ws, hs, w, h, wpls, wpld;
l_float32 *datas, *datad, *lines, *lined;
PROCNAME("fpixLinearCombination");
if (!fpixs1)
return (FPIX *)ERROR_PTR("fpixs1 not defined", procName, fpixd);
if (!fpixs2)
return (FPIX *)ERROR_PTR("fpixs2 not defined", procName, fpixd);
if (fpixs1 == fpixs2)
return (FPIX *)ERROR_PTR("fpixs1 == fpixs2", procName, fpixd);
if (fpixs2 == fpixd)
return (FPIX *)ERROR_PTR("fpixs2 == fpixd", procName, fpixd);
if (fpixs1 != fpixd)
fpixd = fpixCopy(fpixd, fpixs1);
datas = fpixGetData(fpixs2);
datad = fpixGetData(fpixd);
wpls = fpixGetWpl(fpixs2);
wpld = fpixGetWpl(fpixd);
fpixGetDimensions(fpixs2, &ws, &hs);
fpixGetDimensions(fpixd, &w, &h);
w = L_MIN(ws, w);
h = L_MIN(hs, h);
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
for (j = 0; j < w; j++)
lined[j] = a * lined[j] + b * lines[j];
}
return fpixd;
}
/*!
* \brief fpixAddMultConstant()
*
* \param[in] fpix
* \param[in] addc use 0.0 to skip the operation
* \param[in] multc use 1.0 to skip the operation
* \return 0 if OK, 1 on error
*
* <pre>
* Notes:
* (1) This is an in-place operation.
* (2) It can be used to multiply each pixel by a constant,
* and also to add a constant to each pixel. Multiplication
* is done first.
* </pre>
*/
l_ok
fpixAddMultConstant(FPIX *fpix,
l_float32 addc,
l_float32 multc)
{
l_int32 i, j, w, h, wpl;
l_float32 *line, *data;
PROCNAME("fpixAddMultConstant");
if (!fpix)
return ERROR_INT("fpix not defined", procName, 1);
if (addc == 0.0 && multc == 1.0)
return 0;
fpixGetDimensions(fpix, &w, &h);
data = fpixGetData(fpix);
wpl = fpixGetWpl(fpix);
for (i = 0; i < h; i++) {
line = data + i * wpl;
if (addc == 0.0) {
for (j = 0; j < w; j++)
line[j] *= multc;
} else if (multc == 1.0) {
for (j = 0; j < w; j++)
line[j] += addc;
} else {
for (j = 0; j < w; j++) {
line[j] = multc * line[j] + addc;
}
}
}
return 0;
}
/*!
* \brief dpixLinearCombination()
*
* \param[in] dpixd [optional] this can be null, equal to dpixs1, or
* different from dpixs1
* \param[in] dpixs1 can be equal to dpixd
* \param[in] dpixs2
* \param[in] a, b multiplication factors on dpixs1 and dpixs2, rsp.
* \return dpixd always
*
* <pre>
* Notes:
* (1) Computes pixelwise linear combination: a * src1 + b * src2
* (2) Alignment is to UL corner.
* (3) There are 3 cases. The result can go to a new dest,
* in-place to dpixs1, or to an existing input dest:
* * dpixd == null: (src1 + src2) --> new dpixd
* * dpixd == dpixs1: (src1 + src2) --> src1 (in-place)
* * dpixd != dpixs1: (src1 + src2) --> input dpixd
* (4) dpixs2 must be different from both dpixd and dpixs1.
* </pre>
*/
DPIX *
dpixLinearCombination(DPIX *dpixd,
DPIX *dpixs1,
DPIX *dpixs2,
l_float32 a,
l_float32 b)
{
l_int32 i, j, ws, hs, w, h, wpls, wpld;
l_float64 *datas, *datad, *lines, *lined;
PROCNAME("dpixLinearCombination");
if (!dpixs1)
return (DPIX *)ERROR_PTR("dpixs1 not defined", procName, dpixd);
if (!dpixs2)
return (DPIX *)ERROR_PTR("dpixs2 not defined", procName, dpixd);
if (dpixs1 == dpixs2)
return (DPIX *)ERROR_PTR("dpixs1 == dpixs2", procName, dpixd);
if (dpixs2 == dpixd)
return (DPIX *)ERROR_PTR("dpixs2 == dpixd", procName, dpixd);
if (dpixs1 != dpixd)
dpixd = dpixCopy(dpixd, dpixs1);
datas = dpixGetData(dpixs2);
datad = dpixGetData(dpixd);
wpls = dpixGetWpl(dpixs2);
wpld = dpixGetWpl(dpixd);
dpixGetDimensions(dpixs2, &ws, &hs);
dpixGetDimensions(dpixd, &w, &h);
w = L_MIN(ws, w);
h = L_MIN(hs, h);
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
for (j = 0; j < w; j++)
lined[j] = a * lined[j] + b * lines[j];
}
return dpixd;
}
/*!
* \brief dpixAddMultConstant()
*
* \param[in] dpix
* \param[in] addc use 0.0 to skip the operation
* \param[in] multc use 1.0 to skip the operation
* \return 0 if OK, 1 on error
*
* <pre>
* Notes:
* (1) This is an in-place operation.
* (2) It can be used to multiply each pixel by a constant,
* and also to add a constant to each pixel. Multiplication
* is done first.
* </pre>
*/
l_ok
dpixAddMultConstant(DPIX *dpix,
l_float64 addc,
l_float64 multc)
{
l_int32 i, j, w, h, wpl;
l_float64 *line, *data;
PROCNAME("dpixAddMultConstant");
if (!dpix)
return ERROR_INT("dpix not defined", procName, 1);
if (addc == 0.0 && multc == 1.0)
return 0;
dpixGetDimensions(dpix, &w, &h);
data = dpixGetData(dpix);
wpl = dpixGetWpl(dpix);
for (i = 0; i < h; i++) {
line = data + i * wpl;
if (addc == 0.0) {
for (j = 0; j < w; j++)
line[j] *= multc;
} else if (multc == 1.0) {
for (j = 0; j < w; j++)
line[j] += addc;
} else {
for (j = 0; j < w; j++)
line[j] = multc * line[j] + addc;
}
}
return 0;
}
/*--------------------------------------------------------------------*
* Set all *
*--------------------------------------------------------------------*/
/*!
* \brief fpixSetAllArbitrary()
*
* \param[in] fpix
* \param[in] inval to set at each pixel
* \return 0 if OK, 1 on error
*/
l_ok
fpixSetAllArbitrary(FPIX *fpix,
l_float32 inval)
{
l_int32 i, j, w, h;
l_float32 *data, *line;
PROCNAME("fpixSetAllArbitrary");
if (!fpix)
return ERROR_INT("fpix not defined", procName, 1);
fpixGetDimensions(fpix, &w, &h);
data = fpixGetData(fpix);
for (i = 0; i < h; i++) {
line = data + i * w;
for (j = 0; j < w; j++)
*(line + j) = inval;
}
return 0;
}
/*!
* \brief dpixSetAllArbitrary()
*
* \param[in] dpix
* \param[in] inval to set at each pixel
* \return 0 if OK, 1 on error
*/
l_ok
dpixSetAllArbitrary(DPIX *dpix,
l_float64 inval)
{
l_int32 i, j, w, h;
l_float64 *data, *line;
PROCNAME("dpixSetAllArbitrary");
if (!dpix)
return ERROR_INT("dpix not defined", procName, 1);
dpixGetDimensions(dpix, &w, &h);
data = dpixGetData(dpix);
for (i = 0; i < h; i++) {
line = data + i * w;
for (j = 0; j < w; j++)
*(line + j) = inval;
}
return 0;
}
/*--------------------------------------------------------------------*
* Border functions *
*--------------------------------------------------------------------*/
/*!
* \brief fpixAddBorder()
*
* \param[in] fpixs
* \param[in] left, right, top, bot pixels on each side to be added
* \return fpixd, or NULL on error
*
* <pre>
* Notes:
* (1) Adds border of '0' 32-bit pixels
* </pre>
*/
FPIX *
fpixAddBorder(FPIX *fpixs,
l_int32 left,
l_int32 right,
l_int32 top,
l_int32 bot)
{
l_int32 ws, hs, wd, hd;
FPIX *fpixd;
PROCNAME("fpixAddBorder");
if (!fpixs)
return (FPIX *)ERROR_PTR("fpixs not defined", procName, NULL);
if (left <= 0 && right <= 0 && top <= 0 && bot <= 0)
return fpixCopy(NULL, fpixs);
fpixGetDimensions(fpixs, &ws, &hs);
wd = ws + left + right;
hd = hs + top + bot;
if ((fpixd = fpixCreate(wd, hd)) == NULL)
return (FPIX *)ERROR_PTR("fpixd not made", procName, NULL);
fpixCopyResolution(fpixd, fpixs);
fpixRasterop(fpixd, left, top, ws, hs, fpixs, 0, 0);
return fpixd;
}
/*!
* \brief fpixRemoveBorder()
*
* \param[in] fpixs
* \param[in] left, right, top, bot pixels on each side to be removed
* \return fpixd, or NULL on error
*/
FPIX *
fpixRemoveBorder(FPIX *fpixs,
l_int32 left,
l_int32 right,
l_int32 top,
l_int32 bot)
{
l_int32 ws, hs, wd, hd;
FPIX *fpixd;
PROCNAME("fpixRemoveBorder");
if (!fpixs)
return (FPIX *)ERROR_PTR("fpixs not defined", procName, NULL);
if (left <= 0 && right <= 0 && top <= 0 && bot <= 0)
return fpixCopy(NULL, fpixs);
fpixGetDimensions(fpixs, &ws, &hs);
wd = ws - left - right;
hd = hs - top - bot;
if (wd <= 0 || hd <= 0)
return (FPIX *)ERROR_PTR("width & height not both > 0", procName, NULL);
if ((fpixd = fpixCreate(wd, hd)) == NULL)
return (FPIX *)ERROR_PTR("fpixd not made", procName, NULL);
fpixCopyResolution(fpixd, fpixs);
fpixRasterop(fpixd, 0, 0, wd, hd, fpixs, left, top);
return fpixd;
}
/*!
* \brief fpixAddMirroredBorder()
*
* \param[in] fpixs
* \param[in] left, right, top, bot pixels on each side to be added
* \return fpixd, or NULL on error
*
* <pre>
* Notes:
* (1) See pixAddMirroredBorder() for situations of usage.
* </pre>
*/
FPIX *
fpixAddMirroredBorder(FPIX *fpixs,
l_int32 left,
l_int32 right,
l_int32 top,
l_int32 bot)
{
l_int32 i, j, w, h;
FPIX *fpixd;
PROCNAME("fpixAddMirroredBorder");
if (!fpixs)
return (FPIX *)ERROR_PTR("fpixs not defined", procName, NULL);
fpixd = fpixAddBorder(fpixs, left, right, top, bot);
fpixGetDimensions(fpixs, &w, &h);
for (j = 0; j < left; j++)
fpixRasterop(fpixd, left - 1 - j, top, 1, h,
fpixd, left + j, top);
for (j = 0; j < right; j++)
fpixRasterop(fpixd, left + w + j, top, 1, h,
fpixd, left + w - 1 - j, top);
for (i = 0; i < top; i++)
fpixRasterop(fpixd, 0, top - 1 - i, left + w + right, 1,
fpixd, 0, top + i);
for (i = 0; i < bot; i++)
fpixRasterop(fpixd, 0, top + h + i, left + w + right, 1,
fpixd, 0, top + h - 1 - i);
return fpixd;
}
/*!
* \brief fpixAddContinuedBorder()
*
* \param[in] fpixs
* \param[in] left, right, top, bot pixels on each side to be added
* \return fpixd, or NULL on error
*
* <pre>
* Notes:
* (1) This adds pixels on each side whose values are equal to
* the value on the closest boundary pixel.
* </pre>
*/
FPIX *
fpixAddContinuedBorder(FPIX *fpixs,
l_int32 left,
l_int32 right,
l_int32 top,
l_int32 bot)
{
l_int32 i, j, w, h;
FPIX *fpixd;
PROCNAME("fpixAddContinuedBorder");
if (!fpixs)
return (FPIX *)ERROR_PTR("fpixs not defined", procName, NULL);
fpixd = fpixAddBorder(fpixs, left, right, top, bot);
fpixGetDimensions(fpixs, &w, &h);
for (j = 0; j < left; j++)
fpixRasterop(fpixd, j, top, 1, h, fpixd, left, top);
for (j = 0; j < right; j++)
fpixRasterop(fpixd, left + w + j, top, 1, h, fpixd, left + w - 1, top);
for (i = 0; i < top; i++)
fpixRasterop(fpixd, 0, i, left + w + right, 1, fpixd, 0, top);
for (i = 0; i < bot; i++)
fpixRasterop(fpixd, 0, top + h + i, left + w + right, 1,
fpixd, 0, top + h - 1);
return fpixd;
}
/*!
* \brief fpixAddSlopeBorder()
*
* \param[in] fpixs
* \param[in] left, right, top, bot pixels on each side to be added
* \return fpixd, or NULL on error
*
* <pre>
* Notes:
* (1) This adds pixels on each side whose values have a normal
* derivative equal to the normal derivative at the boundary
* of fpixs.
* </pre>
*/
FPIX *
fpixAddSlopeBorder(FPIX *fpixs,
l_int32 left,
l_int32 right,
l_int32 top,
l_int32 bot)
{
l_int32 i, j, w, h, fullw, fullh;
l_float32 val1, val2, del;
FPIX *fpixd;
PROCNAME("fpixAddSlopeBorder");
if (!fpixs)
return (FPIX *)ERROR_PTR("fpixs not defined", procName, NULL);
fpixd = fpixAddBorder(fpixs, left, right, top, bot);
fpixGetDimensions(fpixs, &w, &h);
/* Left */
for (i = top; i < top + h; i++) {
fpixGetPixel(fpixd, left, i, &val1);
fpixGetPixel(fpixd, left + 1, i, &val2);
del = val1 - val2;
for (j = 0; j < left; j++)
fpixSetPixel(fpixd, j, i, val1 + del * (left - j));
}
/* Right */
fullw = left + w + right;
for (i = top; i < top + h; i++) {
fpixGetPixel(fpixd, left + w - 1, i, &val1);
fpixGetPixel(fpixd, left + w - 2, i, &val2);
del = val1 - val2;
for (j = left + w; j < fullw; j++)
fpixSetPixel(fpixd, j, i, val1 + del * (j - left - w + 1));
}
/* Top */
for (j = 0; j < fullw; j++) {
fpixGetPixel(fpixd, j, top, &val1);
fpixGetPixel(fpixd, j, top + 1, &val2);
del = val1 - val2;
for (i = 0; i < top; i++)
fpixSetPixel(fpixd, j, i, val1 + del * (top - i));
}
/* Bottom */
fullh = top + h + bot;
for (j = 0; j < fullw; j++) {
fpixGetPixel(fpixd, j, top + h - 1, &val1);
fpixGetPixel(fpixd, j, top + h - 2, &val2);
del = val1 - val2;
for (i = top + h; i < fullh; i++)
fpixSetPixel(fpixd, j, i, val1 + del * (i - top - h + 1));
}
return fpixd;
}
/*--------------------------------------------------------------------*
* Simple rasterop *
*--------------------------------------------------------------------*/
/*!
* \brief fpixRasterop()
*
* \param[in] fpixd dest fpix
* \param[in] dx x val of UL corner of dest rectangle
* \param[in] dy y val of UL corner of dest rectangle
* \param[in] dw width of dest rectangle
* \param[in] dh height of dest rectangle
* \param[in] fpixs src fpix
* \param[in] sx x val of UL corner of src rectangle
* \param[in] sy y val of UL corner of src rectangle
* \return 0 if OK; 1 on error.
*
* <pre>
* Notes:
* (1) This is similar in structure to pixRasterop(), except
* it only allows copying from the source into the destination.
* For that reason, no op code is necessary. Additionally,
* all pixels are 32 bit words (float values), which makes
* the copy very simple.
* (2) Clipping of both src and dest fpix are done automatically.
* (3) This allows in-place copying, without checking to see if
* the result is valid: use for in-place with caution!
* </pre>
*/
l_ok
fpixRasterop(FPIX *fpixd,
l_int32 dx,
l_int32 dy,
l_int32 dw,
l_int32 dh,
FPIX *fpixs,
l_int32 sx,
l_int32 sy)
{
l_int32 fsw, fsh, fdw, fdh, dhangw, shangw, dhangh, shangh;
l_int32 i, j, wpls, wpld;
l_float32 *datas, *datad, *lines, *lined;
PROCNAME("fpixRasterop");
if (!fpixs)
return ERROR_INT("fpixs not defined", procName, 1);
if (!fpixd)
return ERROR_INT("fpixd not defined", procName, 1);
/* -------------------------------------------------------- *
* Clip to maximum rectangle with both src and dest *
* -------------------------------------------------------- */
fpixGetDimensions(fpixs, &fsw, &fsh);
fpixGetDimensions(fpixd, &fdw, &fdh);
/* First clip horizontally (sx, dx, dw) */
if (dx < 0) {
sx -= dx; /* increase sx */
dw += dx; /* reduce dw */
dx = 0;
}
if (sx < 0) {
dx -= sx; /* increase dx */
dw += sx; /* reduce dw */
sx = 0;
}
dhangw = dx + dw - fdw; /* rect overhang of dest to right */
if (dhangw > 0)
dw -= dhangw; /* reduce dw */
shangw = sx + dw - fsw; /* rect overhang of src to right */
if (shangw > 0)
dw -= shangw; /* reduce dw */
/* Then clip vertically (sy, dy, dh) */
if (dy < 0) {
sy -= dy; /* increase sy */
dh += dy; /* reduce dh */
dy = 0;
}
if (sy < 0) {
dy -= sy; /* increase dy */
dh += sy; /* reduce dh */
sy = 0;
}
dhangh = dy + dh - fdh; /* rect overhang of dest below */
if (dhangh > 0)
dh -= dhangh; /* reduce dh */
shangh = sy + dh - fsh; /* rect overhang of src below */
if (shangh > 0)
dh -= shangh; /* reduce dh */
/* if clipped entirely, quit */
if ((dw <= 0) || (dh <= 0))
return 0;
/* -------------------------------------------------------- *
* Copy block of data *
* -------------------------------------------------------- */
datas = fpixGetData(fpixs);
datad = fpixGetData(fpixd);
wpls = fpixGetWpl(fpixs);
wpld = fpixGetWpl(fpixd);
datas += sy * wpls + sx; /* at UL corner of block */
datad += dy * wpld + dx; /* at UL corner of block */
for (i = 0; i < dh; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
for (j = 0; j < dw; j++) {
*lined = *lines;
lines++;
lined++;
}
}
return 0;
}
/*--------------------------------------------------------------------*
* Rotation by multiples of 90 degrees *
*--------------------------------------------------------------------*/
/*!
* \brief fpixRotateOrth()
*
* \param[in] fpixs
* \param[in] quads 0-3; number of 90 degree cw rotations
* \return fpixd, or NULL on error
*/
FPIX *
fpixRotateOrth(FPIX *fpixs,
l_int32 quads)
{
PROCNAME("fpixRotateOrth");
if (!fpixs)
return (FPIX *)ERROR_PTR("fpixs not defined", procName, NULL);
if (quads < 0 || quads > 3)
return (FPIX *)ERROR_PTR("quads not in {0,1,2,3}", procName, NULL);
if (quads == 0)
return fpixCopy(NULL, fpixs);
else if (quads == 1)
return fpixRotate90(fpixs, 1);
else if (quads == 2)
return fpixRotate180(NULL, fpixs);
else /* quads == 3 */
return fpixRotate90(fpixs, -1);
}
/*!
* \brief fpixRotate180()
*
* \param[in] fpixd [optional] can be null, equal to fpixs,
* or different from fpixs
* \param[in] fpixs
* \return fpixd, or NULL on error
*
* <pre>
* Notes:
* (1) This does a 180 rotation of the image about the center,
* which is equivalent to a left-right flip about a vertical
* line through the image center, followed by a top-bottom
* flip about a horizontal line through the image center.
* (2) There are 3 cases for input:
* (a) fpixd == null (creates a new fpixd)
* (b) fpixd == fpixs (in-place operation)
* (c) fpixd != fpixs (existing fpixd)
* (3) For clarity, use these three patterns, respectively:
* (a) fpixd = fpixRotate180(NULL, fpixs);
* (b) fpixRotate180(fpixs, fpixs);
* (c) fpixRotate180(fpixd, fpixs);
* </pre>
*/
FPIX *
fpixRotate180(FPIX *fpixd,
FPIX *fpixs)
{
PROCNAME("fpixRotate180");
if (!fpixs)
return (FPIX *)ERROR_PTR("fpixs not defined", procName, NULL);
/* Prepare pixd for in-place operation */
if ((fpixd = fpixCopy(fpixd, fpixs)) == NULL)
return (FPIX *)ERROR_PTR("fpixd not made", procName, NULL);
fpixFlipLR(fpixd, fpixd);
fpixFlipTB(fpixd, fpixd);
return fpixd;
}
/*!
* \brief fpixRotate90()
*
* \param[in] fpixs
* \param[in] direction 1 = clockwise; -1 = counter-clockwise
* \return fpixd, or NULL on error
*
* <pre>
* Notes:
* (1) This does a 90 degree rotation of the image about the center,
* either cw or ccw, returning a new pix.
* (2) The direction must be either 1 (cw) or -1 (ccw).
* </pre>
*/
FPIX *
fpixRotate90(FPIX *fpixs,
l_int32 direction)
{
l_int32 i, j, wd, hd, wpls, wpld;
l_float32 *datas, *datad, *lines, *lined;
FPIX *fpixd;
PROCNAME("fpixRotate90");
if (!fpixs)
return (FPIX *)ERROR_PTR("fpixs not defined", procName, NULL);
if (direction != 1 && direction != -1)
return (FPIX *)ERROR_PTR("invalid direction", procName, NULL);
fpixGetDimensions(fpixs, &hd, &wd);
if ((fpixd = fpixCreate(wd, hd)) == NULL)
return (FPIX *)ERROR_PTR("fpixd not made", procName, NULL);
fpixCopyResolution(fpixd, fpixs);
datas = fpixGetData(fpixs);
wpls = fpixGetWpl(fpixs);
datad = fpixGetData(fpixd);
wpld = fpixGetWpl(fpixd);
if (direction == 1) { /* clockwise */
for (i = 0; i < hd; i++) {
lined = datad + i * wpld;
lines = datas + (wd - 1) * wpls;
for (j = 0; j < wd; j++) {
lined[j] = lines[i];
lines -= wpls;
}
}
} else { /* ccw */
for (i = 0; i < hd; i++) {
lined = datad + i * wpld;
lines = datas;
for (j = 0; j < wd; j++) {
lined[j] = lines[hd - 1 - i];
lines += wpls;
}
}
}
return fpixd;
}
/*!
* \brief pixFlipLR()
*
* \param[in] fpixd [optional] can be null, equal to fpixs,
* or different from fpixs
* \param[in] fpixs
* \return fpixd, or NULL on error
*
* <pre>
* Notes:
* (1) This does a left-right flip of the image, which is
* equivalent to a rotation out of the plane about a
* vertical line through the image center.
* (2) There are 3 cases for input:
* (a) fpixd == null (creates a new fpixd)
* (b) fpixd == fpixs (in-place operation)
* (c) fpixd != fpixs (existing fpixd)
* (3) For clarity, use these three patterns, respectively:
* (a) fpixd = fpixFlipLR(NULL, fpixs);
* (b) fpixFlipLR(fpixs, fpixs);
* (c) fpixFlipLR(fpixd, fpixs);
* (4) If an existing fpixd is not the same size as fpixs, the
* image data will be reallocated.
* </pre>
*/
FPIX *
fpixFlipLR(FPIX *fpixd,
FPIX *fpixs)
{
l_int32 i, j, w, h, wpl, bpl;
l_float32 *line, *data, *buffer;
PROCNAME("fpixFlipLR");
if (!fpixs)
return (FPIX *)ERROR_PTR("fpixs not defined", procName, NULL);
fpixGetDimensions(fpixs, &w, &h);
/* Prepare fpixd for in-place operation */
if ((fpixd = fpixCopy(fpixd, fpixs)) == NULL)
return (FPIX *)ERROR_PTR("fpixd not made", procName, NULL);
data = fpixGetData(fpixd);
wpl = fpixGetWpl(fpixd); /* 4-byte words */
bpl = 4 * wpl;
if ((buffer = (l_float32 *)LEPT_CALLOC(wpl, sizeof(l_float32))) == NULL) {
fpixDestroy(&fpixd);
return (FPIX *)ERROR_PTR("buffer not made", procName, NULL);
}
for (i = 0; i < h; i++) {
line = data + i * wpl;
memcpy(buffer, line, bpl);
for (j = 0; j < w; j++)
line[j] = buffer[w - 1 - j];
}
LEPT_FREE(buffer);
return fpixd;
}
/*!
* \brief fpixFlipTB()
*
* \param[in] fpixd [optional] can be null, equal to fpixs,
* or different from fpixs
* \param[in] fpixs
* \return fpixd, or NULL on error
*
* <pre>
* Notes:
* (1) This does a top-bottom flip of the image, which is
* equivalent to a rotation out of the plane about a
* horizontal line through the image center.
* (2) There are 3 cases for input:
* (a) fpixd == null (creates a new fpixd)
* (b) fpixd == fpixs (in-place operation)
* (c) fpixd != fpixs (existing fpixd)
* (3) For clarity, use these three patterns, respectively:
* (a) fpixd = fpixFlipTB(NULL, fpixs);
* (b) fpixFlipTB(fpixs, fpixs);
* (c) fpixFlipTB(fpixd, fpixs);
* (4) If an existing fpixd is not the same size as fpixs, the
* image data will be reallocated.
* </pre>
*/
FPIX *
fpixFlipTB(FPIX *fpixd,
FPIX *fpixs)
{
l_int32 i, k, h, h2, wpl, bpl;
l_float32 *linet, *lineb, *data, *buffer;
PROCNAME("fpixFlipTB");
if (!fpixs)
return (FPIX *)ERROR_PTR("fpixs not defined", procName, NULL);
/* Prepare fpixd for in-place operation */
if ((fpixd = fpixCopy(fpixd, fpixs)) == NULL)
return (FPIX *)ERROR_PTR("fpixd not made", procName, NULL);
data = fpixGetData(fpixd);
wpl = fpixGetWpl(fpixd);
fpixGetDimensions(fpixd, NULL, &h);
if ((buffer = (l_float32 *)LEPT_CALLOC(wpl, sizeof(l_float32))) == NULL) {
fpixDestroy(&fpixd);
return (FPIX *)ERROR_PTR("buffer not made", procName, NULL);
}
h2 = h / 2;
bpl = 4 * wpl;
for (i = 0, k = h - 1; i < h2; i++, k--) {
linet = data + i * wpl;
lineb = data + k * wpl;
memcpy(buffer, linet, bpl);
memcpy(linet, lineb, bpl);
memcpy(lineb, buffer, bpl);
}
LEPT_FREE(buffer);
return fpixd;
}
/*--------------------------------------------------------------------*
* Affine and projective interpolated transforms *
*--------------------------------------------------------------------*/
/*!
* \brief fpixAffinePta()
*
* \param[in] fpixs 8 bpp
* \param[in] ptad 4 pts of final coordinate space
* \param[in] ptas 4 pts of initial coordinate space
* \param[in] border size of extension with constant normal derivative
* \param[in] inval value brought in; typ. 0
* \return fpixd, or NULL on error
*
* <pre>
* Notes:
* (1) If %border > 0, all four sides are extended by that distance,
* and removed after the transformation is finished. Pixels
* that would be brought in to the trimmed result from outside
* the extended region are assigned %inval. The purpose of
* extending the image is to avoid such assignments.
* (2) On the other hand, you may want to give all pixels that
* are brought in from outside fpixs a specific value. In that
* case, set %border == 0.
* </pre>
*/
FPIX *
fpixAffinePta(FPIX *fpixs,
PTA *ptad,
PTA *ptas,
l_int32 border,
l_float32 inval)
{
l_float32 *vc;
PTA *ptas2, *ptad2;
FPIX *fpixs2, *fpixd, *fpixd2;
PROCNAME("fpixAffinePta");
if (!fpixs)
return (FPIX *)ERROR_PTR("fpixs not defined", procName, NULL);
if (!ptas)
return (FPIX *)ERROR_PTR("ptas not defined", procName, NULL);
if (!ptad)
return (FPIX *)ERROR_PTR("ptad not defined", procName, NULL);
/* If a border is to be added, also translate the ptas */
if (border > 0) {
ptas2 = ptaTransform(ptas, border, border, 1.0, 1.0);
ptad2 = ptaTransform(ptad, border, border, 1.0, 1.0);
fpixs2 = fpixAddSlopeBorder(fpixs, border, border, border, border);
} else {
ptas2 = ptaClone(ptas);
ptad2 = ptaClone(ptad);
fpixs2 = fpixClone(fpixs);
}
/* Get backwards transform from dest to src, and apply it */
getAffineXformCoeffs(ptad2, ptas2, &vc);
fpixd2 = fpixAffine(fpixs2, vc, inval);
fpixDestroy(&fpixs2);
ptaDestroy(&ptas2);
ptaDestroy(&ptad2);
LEPT_FREE(vc);
if (border == 0)
return fpixd2;
/* Remove the added border */
fpixd = fpixRemoveBorder(fpixd2, border, border, border, border);
fpixDestroy(&fpixd2);
return fpixd;
}
/*!
* \brief fpixAffine()
*
* \param[in] fpixs 8 bpp
* \param[in] vc vector of 8 coefficients for projective transformation
* \param[in] inval value brought in; typ. 0
* \return fpixd, or NULL on error
*/
FPIX *
fpixAffine(FPIX *fpixs,
l_float32 *vc,
l_float32 inval)
{
l_int32 i, j, w, h, wpld;
l_float32 val;
l_float32 *datas, *datad, *lined;
l_float32 x, y;
FPIX *fpixd;
PROCNAME("fpixAffine");
if (!fpixs)
return (FPIX *)ERROR_PTR("fpixs not defined", procName, NULL);
fpixGetDimensions(fpixs, &w, &h);
if (!vc)
return (FPIX *)ERROR_PTR("vc not defined", procName, NULL);
datas = fpixGetData(fpixs);
fpixd = fpixCreateTemplate(fpixs);
fpixSetAllArbitrary(fpixd, inval);
datad = fpixGetData(fpixd);
wpld = fpixGetWpl(fpixd);
/* Iterate over destination pixels */
for (i = 0; i < h; i++) {
lined = datad + i * wpld;
for (j = 0; j < w; j++) {
/* Compute float src pixel location corresponding to (i,j) */
affineXformPt(vc, j, i, &x, &y);
linearInterpolatePixelFloat(datas, w, h, x, y, inval, &val);
*(lined + j) = val;
}
}
return fpixd;
}
/*!
* \brief fpixProjectivePta()
*
* \param[in] fpixs 8 bpp
* \param[in] ptad 4 pts of final coordinate space
* \param[in] ptas 4 pts of initial coordinate space
* \param[in] border size of extension with constant normal derivative
* \param[in] inval value brought in; typ. 0
* \return fpixd, or NULL on error
*
* <pre>
* Notes:
* (1) If %border > 0, all four sides are extended by that distance,
* and removed after the transformation is finished. Pixels
* that would be brought in to the trimmed result from outside
* the extended region are assigned %inval. The purpose of
* extending the image is to avoid such assignments.
* (2) On the other hand, you may want to give all pixels that
* are brought in from outside fpixs a specific value. In that
* case, set %border == 0.
* </pre>
*/
FPIX *
fpixProjectivePta(FPIX *fpixs,
PTA *ptad,
PTA *ptas,
l_int32 border,
l_float32 inval)
{
l_float32 *vc;
PTA *ptas2, *ptad2;
FPIX *fpixs2, *fpixd, *fpixd2;
PROCNAME("fpixProjectivePta");
if (!fpixs)
return (FPIX *)ERROR_PTR("fpixs not defined", procName, NULL);
if (!ptas)
return (FPIX *)ERROR_PTR("ptas not defined", procName, NULL);
if (!ptad)
return (FPIX *)ERROR_PTR("ptad not defined", procName, NULL);
/* If a border is to be added, also translate the ptas */
if (border > 0) {
ptas2 = ptaTransform(ptas, border, border, 1.0, 1.0);
ptad2 = ptaTransform(ptad, border, border, 1.0, 1.0);
fpixs2 = fpixAddSlopeBorder(fpixs, border, border, border, border);
} else {
ptas2 = ptaClone(ptas);
ptad2 = ptaClone(ptad);
fpixs2 = fpixClone(fpixs);
}
/* Get backwards transform from dest to src, and apply it */
getProjectiveXformCoeffs(ptad2, ptas2, &vc);
fpixd2 = fpixProjective(fpixs2, vc, inval);
fpixDestroy(&fpixs2);
ptaDestroy(&ptas2);
ptaDestroy(&ptad2);
LEPT_FREE(vc);
if (border == 0)
return fpixd2;
/* Remove the added border */
fpixd = fpixRemoveBorder(fpixd2, border, border, border, border);
fpixDestroy(&fpixd2);
return fpixd;
}
/*!
* \brief fpixProjective()
*
* \param[in] fpixs 8 bpp
* \param[in] vc vector of 8 coefficients for projective transform
* \param[in] inval value brought in; typ. 0
* \return fpixd, or NULL on error
*/
FPIX *
fpixProjective(FPIX *fpixs,
l_float32 *vc,
l_float32 inval)
{
l_int32 i, j, w, h, wpld;
l_float32 val;
l_float32 *datas, *datad, *lined;
l_float32 x, y;
FPIX *fpixd;
PROCNAME("fpixProjective");
if (!fpixs)
return (FPIX *)ERROR_PTR("fpixs not defined", procName, NULL);
fpixGetDimensions(fpixs, &w, &h);
if (!vc)
return (FPIX *)ERROR_PTR("vc not defined", procName, NULL);
datas = fpixGetData(fpixs);
fpixd = fpixCreateTemplate(fpixs);
fpixSetAllArbitrary(fpixd, inval);
datad = fpixGetData(fpixd);
wpld = fpixGetWpl(fpixd);
/* Iterate over destination pixels */
for (i = 0; i < h; i++) {
lined = datad + i * wpld;
for (j = 0; j < w; j++) {
/* Compute float src pixel location corresponding to (i,j) */
projectiveXformPt(vc, j, i, &x, &y);
linearInterpolatePixelFloat(datas, w, h, x, y, inval, &val);
*(lined + j) = val;
}
}
return fpixd;
}
/*!
* \brief linearInterpolatePixelFloat()
*
* \param[in] datas ptr to beginning of float image data
* \param[in] w, h dimensions of image
* \param[in] x, y floating pt location for evaluation
* \param[in] inval float value brought in from the outside when the
* input x,y location is outside the image
* \param[out] pval interpolated float value
* \return 0 if OK, 1 on error
*
* <pre>
* Notes:
* (1) This is a standard linear interpolation function. It is
* equivalent to area weighting on each component, and
* avoids "jaggies" when rendering sharp edges.
* </pre>
*/
l_ok
linearInterpolatePixelFloat(l_float32 *datas,
l_int32 w,
l_int32 h,
l_float32 x,
l_float32 y,
l_float32 inval,
l_float32 *pval)
{
l_int32 xpm, ypm, xp, yp, xf, yf;
l_float32 v00, v01, v10, v11;
l_float32 *lines;
PROCNAME("linearInterpolatePixelFloat");
if (!pval)
return ERROR_INT("&val not defined", procName, 1);
*pval = inval;
if (!datas)
return ERROR_INT("datas not defined", procName, 1);
/* Skip if off the edge */
if (x < 0.0 || y < 0.0 || x > w - 2.0 || y > h - 2.0)
return 0;
xpm = (l_int32)(16.0 * x + 0.5);
ypm = (l_int32)(16.0 * y + 0.5);
xp = xpm >> 4;
yp = ypm >> 4;
xf = xpm & 0x0f;
yf = ypm & 0x0f;
#if DEBUG
if (xf < 0 || yf < 0)
fprintf(stderr, "xp = %d, yp = %d, xf = %d, yf = %d\n", xp, yp, xf, yf);
#endif /* DEBUG */
/* Interpolate by area weighting. */
lines = datas + yp * w;
v00 = (16.0 - xf) * (16.0 - yf) * (*(lines + xp));
v10 = xf * (16.0 - yf) * (*(lines + xp + 1));
v01 = (16.0 - xf) * yf * (*(lines + w + xp));
v11 = (l_float32)(xf) * yf * (*(lines + w + xp + 1));
*pval = (v00 + v01 + v10 + v11) / 256.0;
return 0;
}
/*--------------------------------------------------------------------*
* Thresholding to 1 bpp Pix *
*--------------------------------------------------------------------*/
/*!
* \brief fpixThresholdToPix()
*
* \param[in] fpix
* \param[in] thresh
* \return pixd 1 bpp, or NULL on error
*
* <pre>
* Notes:
* (1) For all values of fpix that are <= thresh, sets the pixel
* in pixd to 1.
* </pre>
*/
PIX *
fpixThresholdToPix(FPIX *fpix,
l_float32 thresh)
{
l_int32 i, j, w, h, wpls, wpld;
l_float32 *datas, *lines;
l_uint32 *datad, *lined;
PIX *pixd;
PROCNAME("fpixThresholdToPix");
if (!fpix)
return (PIX *)ERROR_PTR("fpix not defined", procName, NULL);
fpixGetDimensions(fpix, &w, &h);
datas = fpixGetData(fpix);
wpls = fpixGetWpl(fpix);
pixd = pixCreate(w, h, 1);
datad = pixGetData(pixd);
wpld = pixGetWpl(pixd);
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
for (j = 0; j < w; j++) {
if (lines[j] <= thresh)
SET_DATA_BIT(lined, j);
}
}
return pixd;
}
/*--------------------------------------------------------------------*
* Generate function from components *
*--------------------------------------------------------------------*/
/*!
* \brief pixComponentFunction()
*
* \param[in] pix 32 bpp rgb
* \param[in] rnum, gnum, bnum coefficients for numerator
* \param[in] rdenom, gdenom, bdenom coefficients for denominator
* \return fpixd, or NULL on error
*
* <pre>
* Notes:
* (1) This stores a function of the component values of each
* input pixel in %fpixd.
* (2) The function is a ratio of linear combinations of component values.
* There are two special cases for denominator coefficients:
* (a) The denominator is 1.0: input 0 for all denominator coefficients
* (b) Only one component is used in the denominator: input 1.0
* for that denominator component and 0.0 for the other two.
* (3) If the denominator is 0, multiply by an arbitrary number that
* is much larger than 1. Choose 256 "arbitrarily".
*
* </pre>
*/
FPIX *
pixComponentFunction(PIX *pix,
l_float32 rnum,
l_float32 gnum,
l_float32 bnum,
l_float32 rdenom,
l_float32 gdenom,
l_float32 bdenom)
{
l_int32 i, j, w, h, wpls, wpld, rval, gval, bval, zerodenom, onedenom;
l_float32 fnum, fdenom;
l_uint32 *datas, *lines;
l_float32 *datad, *lined, *recip;
FPIX *fpixd;
PROCNAME("pixComponentFunction");
if (!pix || pixGetDepth(pix) != 32)
return (FPIX *)ERROR_PTR("pix undefined or not 32 bpp", procName, NULL);
pixGetDimensions(pix, &w, &h, NULL);
datas = pixGetData(pix);
wpls = pixGetWpl(pix);
fpixd = fpixCreate(w, h);
datad = fpixGetData(fpixd);
wpld = fpixGetWpl(fpixd);
zerodenom = (rdenom == 0.0 && gdenom == 0.0 && bdenom == 0.0) ? 1: 0;
onedenom = ((rdenom == 1.0 && gdenom == 0.0 && bdenom == 0.0) ||
(rdenom == 0.0 && gdenom == 1.0 && bdenom == 0.0) ||
(rdenom == 0.0 && gdenom == 0.0 && bdenom == 1.0)) ? 1 : 0;
recip = NULL;
if (onedenom) {
recip = (l_float32 *)LEPT_CALLOC(256, sizeof(l_float32));
recip[0] = 256; /* arbitrary large number */
for (i = 1; i < 256; i++)
recip[i] = 1.0 / (l_float32)i;
}
for (i = 0; i < h; i++) {
lines = datas + i * wpls;
lined = datad + i * wpld;
if (zerodenom) {
for (j = 0; j < w; j++) {
extractRGBValues(lines[j], &rval, &gval, &bval);
lined[j] = rnum * rval + gnum * gval + bnum * bval;
}
} else if (onedenom && rdenom == 1.0) {
for (j = 0; j < w; j++) {
extractRGBValues(lines[j], &rval, &gval, &bval);
lined[j]
= recip[rval] * (rnum * rval + gnum * gval + bnum * bval);
}
} else if (onedenom && gdenom == 1.0) {
for (j = 0; j < w; j++) {
extractRGBValues(lines[j], &rval, &gval, &bval);
lined[j]
= recip[gval] * (rnum * rval + gnum * gval + bnum * bval);
}
} else if (onedenom && bdenom == 1.0) {
for (j = 0; j < w; j++) {
extractRGBValues(lines[j], &rval, &gval, &bval);
lined[j]
= recip[bval] * (rnum * rval + gnum * gval + bnum * bval);
}
} else { /* general case */
for (j = 0; j < w; j++) {
extractRGBValues(lines[j], &rval, &gval, &bval);
fnum = rnum * rval + gnum * gval + bnum * bval;
fdenom = rdenom * rval + gdenom * gval + bdenom * bval;
lined[j] = (fdenom == 0) ? 256.0 * fnum : fnum / fdenom;
}
}
}
LEPT_FREE(recip);
return fpixd;
}