/*====================================================================* - 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. *====================================================================*/ /* * pix2.c * * This file has these basic operations: * * (1) Get and set: individual pixels, full image, rectangular region, * pad pixels, border pixels, and color components for RGB * (2) Add and remove border pixels * (3) Endian byte swaps * (4) Simple method for byte-processing images (instead of words) * * Pixel poking * l_int32 pixGetPixel() * l_int32 pixSetPixel() * l_int32 pixGetRGBPixel() * l_int32 pixSetRGBPixel() * l_int32 pixGetRandomPixel() * l_int32 pixClearPixel() * l_int32 pixFlipPixel() * void setPixelLow() * * Full image clear/set/set-to-arbitrary-value * l_int32 pixClearAll() * l_int32 pixSetAll() * l_int32 pixSetAllArbitrary() * l_int32 pixSetBlackOrWhite() * * Rectangular region clear/set/set-to-arbitrary-value/blend * l_int32 pixClearInRect() * l_int32 pixSetInRect() * l_int32 pixSetInRectArbitrary() * l_int32 pixBlendInRect() * * Set pad bits * l_int32 pixSetPadBits() * l_int32 pixSetPadBitsBand() * * Assign border pixels * l_int32 pixSetOrClearBorder() * l_int32 pixSetBorderVal() * l_int32 pixSetBorderRingVal() * l_int32 pixSetMirroredBorder() * PIX *pixCopyBorder() * * Add and remove border * PIX *pixAddBorder() * PIX *pixAddBlackBorder() * PIX *pixAddBorderGeneral() * PIX *pixRemoveBorder() * PIX *pixRemoveBorderGeneral() * PIX *pixAddMirroredBorder() * PIX *pixAddRepeatedBorder() * PIX *pixAddMixedBorder() * * Color sample setting and extraction * PIX *pixCreateRGBImage() * PIX *pixGetRGBComponent() * l_int32 pixSetRGBComponent() * PIX *pixGetRGBComponentCmap() * l_int32 composeRGBPixel() * void extractRGBValues() * l_int32 extractMinMaxComponent() * l_int32 pixGetRGBLine() * * Conversion between big and little endians * PIX *pixEndianByteSwapNew() * l_int32 pixEndianByteSwap() * l_int32 lineEndianByteSwap() * PIX *pixEndianTwoByteSwapNew() * l_int32 pixEndianTwoByteSwap() * * Extract raster data as binary string * l_int32 pixGetRasterData() * * Setup helpers for 8 bpp byte processing * l_uint8 **pixSetupByteProcessing() * l_int32 pixCleanupByteProcessing() * * Setting parameters for antialias masking with alpha transforms * void l_setAlphaMaskBorder() * * *** indicates implicit assumption about RGB component ordering */ #include #include "allheaders.h" static const l_uint32 rmask32[] = {0x0, 0x00000001, 0x00000003, 0x00000007, 0x0000000f, 0x0000001f, 0x0000003f, 0x0000007f, 0x000000ff, 0x000001ff, 0x000003ff, 0x000007ff, 0x00000fff, 0x00001fff, 0x00003fff, 0x00007fff, 0x0000ffff, 0x0001ffff, 0x0003ffff, 0x0007ffff, 0x000fffff, 0x001fffff, 0x003fffff, 0x007fffff, 0x00ffffff, 0x01ffffff, 0x03ffffff, 0x07ffffff, 0x0fffffff, 0x1fffffff, 0x3fffffff, 0x7fffffff, 0xffffffff}; /* This is a global that determines the default 8 bpp alpha mask values * for rings at distance 1 and 2 from the border. Declare extern * to use. To change the values, use l_setAlphaMaskBorder(). */ LEPT_DLL l_float32 AlphaMaskBorderVals[2] = {0.0, 0.5}; #ifndef NO_CONSOLE_IO #define DEBUG_SERIALIZE 0 #endif /* ~NO_CONSOLE_IO */ /*-------------------------------------------------------------* * Pixel poking * *-------------------------------------------------------------*/ /*! * pixGetPixel() * * Input: pix * (x,y) pixel coords * &val ( pixel value) * Return: 0 if OK; 1 on error * * Notes: * (1) This returns the value in the data array. If the pix is * colormapped, it returns the colormap index, not the rgb value. * (2) Because of the function overhead and the parameter checking, * this is much slower than using the GET_DATA_*() macros directly. * Speed on a 1 Mpixel RGB image, using a 3 GHz machine: * * pixGet/pixSet: ~25 Mpix/sec * * GET_DATA/SET_DATA: ~350 MPix/sec * If speed is important and you're doing random access into * the pix, use pixGetLinePtrs() and the array access macros. */ l_int32 pixGetPixel(PIX *pix, l_int32 x, l_int32 y, l_uint32 *pval) { l_int32 w, h, d, wpl, val; l_uint32 *line, *data; PROCNAME("pixGetPixel"); if (!pval) return ERROR_INT("pval not defined", procName, 1); *pval = 0; if (!pix) return ERROR_INT("pix not defined", procName, 1); pixGetDimensions(pix, &w, &h, &d); if (x < 0 || x >= w) return ERROR_INT("x out of bounds", procName, 1); if (y < 0 || y >= h) return ERROR_INT("y out of bounds", procName, 1); wpl = pixGetWpl(pix); data = pixGetData(pix); line = data + y * wpl; switch (d) { case 1: val = GET_DATA_BIT(line, x); break; case 2: val = GET_DATA_DIBIT(line, x); break; case 4: val = GET_DATA_QBIT(line, x); break; case 8: val = GET_DATA_BYTE(line, x); break; case 16: val = GET_DATA_TWO_BYTES(line, x); break; case 32: val = line[x]; break; default: return ERROR_INT("depth must be in {1,2,4,8,16,32} bpp", procName, 1); } *pval = val; return 0; } /*! * pixSetPixel() * * Input: pix * (x,y) pixel coords * val (value to be inserted) * Return: 0 if OK; 1 on error * * Notes: * (1) Warning: the input value is not checked for overflow with respect * the the depth of @pix, and the sign bit (if any) is ignored. * * For d == 1, @val > 0 sets the bit on. * * For d == 2, 4, 8 and 16, @val is masked to the maximum allowable * pixel value, and any (invalid) higher order bits are discarded. * (2) See pixGetPixel() for information on performance. */ l_int32 pixSetPixel(PIX *pix, l_int32 x, l_int32 y, l_uint32 val) { l_int32 w, h, d, wpl; l_uint32 *line, *data; PROCNAME("pixSetPixel"); if (!pix) return ERROR_INT("pix not defined", procName, 1); pixGetDimensions(pix, &w, &h, &d); if (x < 0 || x >= w) return ERROR_INT("x out of bounds", procName, 1); if (y < 0 || y >= h) return ERROR_INT("y out of bounds", procName, 1); data = pixGetData(pix); wpl = pixGetWpl(pix); line = data + y * wpl; switch (d) { case 1: if (val) SET_DATA_BIT(line, x); else CLEAR_DATA_BIT(line, x); break; case 2: SET_DATA_DIBIT(line, x, val); break; case 4: SET_DATA_QBIT(line, x, val); break; case 8: SET_DATA_BYTE(line, x, val); break; case 16: SET_DATA_TWO_BYTES(line, x, val); break; case 32: line[x] = val; break; default: return ERROR_INT("depth must be in {1,2,4,8,16,32} bpp", procName, 1); } return 0; } /*! * pixGetRGBPixel() * * Input: pix (32 bpp rgb, not colormapped) * (x,y) pixel coords * &rval ( red component) * &gval ( green component) * &bval ( blue component) * Return: 0 if OK; 1 on error */ l_int32 pixGetRGBPixel(PIX *pix, l_int32 x, l_int32 y, l_int32 *prval, l_int32 *pgval, l_int32 *pbval) { l_int32 w, h, d, wpl; l_uint32 *data, *ppixel; PROCNAME("pixGetRGBPixel"); if (!pix) return ERROR_INT("pix not defined", procName, 1); pixGetDimensions(pix, &w, &h, &d); if (d != 32) return ERROR_INT("pix not 32 bpp", procName, 1); if (x < 0 || x >= w) return ERROR_INT("x out of bounds", procName, 1); if (y < 0 || y >= h) return ERROR_INT("y out of bounds", procName, 1); wpl = pixGetWpl(pix); data = pixGetData(pix); ppixel = data + y * wpl + x; if (prval) *prval = GET_DATA_BYTE(ppixel, COLOR_RED); if (pgval) *pgval = GET_DATA_BYTE(ppixel, COLOR_GREEN); if (pbval) *pbval = GET_DATA_BYTE(ppixel, COLOR_BLUE); return 0; } /*! * pixSetRGBPixel() * * Input: pix (32 bpp rgb) * (x,y) pixel coords * rval (red component) * gval (green component) * bval (blue component) * Return: 0 if OK; 1 on error */ l_int32 pixSetRGBPixel(PIX *pix, l_int32 x, l_int32 y, l_int32 rval, l_int32 gval, l_int32 bval) { l_int32 w, h, d, wpl; l_uint32 pixel; l_uint32 *data, *line; PROCNAME("pixSetRGBPixel"); if (!pix) return ERROR_INT("pix not defined", procName, 1); pixGetDimensions(pix, &w, &h, &d); if (d != 32) return ERROR_INT("pix not 32 bpp", procName, 1); if (x < 0 || x >= w) return ERROR_INT("x out of bounds", procName, 1); if (y < 0 || y >= h) return ERROR_INT("y out of bounds", procName, 1); wpl = pixGetWpl(pix); data = pixGetData(pix); line = data + y * wpl; composeRGBPixel(rval, gval, bval, &pixel); *(line + x) = pixel; return 0; } /*! * pixGetRandomPixel() * * Input: pix (any depth; can be colormapped) * &val ( pixel value) * &x ( x coordinate chosen; can be null) * &y ( y coordinate chosen; can be null) * Return: 0 if OK; 1 on error * * Notes: * (1) If the pix is colormapped, it returns the rgb value. */ l_int32 pixGetRandomPixel(PIX *pix, l_uint32 *pval, l_int32 *px, l_int32 *py) { l_int32 w, h, x, y, rval, gval, bval; l_uint32 val; PIXCMAP *cmap; PROCNAME("pixGetRandomPixel"); if (!pval) return ERROR_INT("pval not defined", procName, 1); *pval = 0; if (!pix) return ERROR_INT("pix not defined", procName, 1); pixGetDimensions(pix, &w, &h, NULL); x = rand() % w; y = rand() % h; if (px) *px = x; if (py) *py = y; pixGetPixel(pix, x, y, &val); if ((cmap = pixGetColormap(pix)) != NULL) { pixcmapGetColor(cmap, val, &rval, &gval, &bval); composeRGBPixel(rval, gval, bval, pval); } else *pval = val; return 0; } /*! * pixClearPixel() * * Input: pix * (x,y) pixel coords * Return: 0 if OK; 1 on error. */ l_int32 pixClearPixel(PIX *pix, l_int32 x, l_int32 y) { l_int32 w, h, d, wpl; l_uint32 *line, *data; PROCNAME("pixClearPixel"); if (!pix) return ERROR_INT("pix not defined", procName, 1); pixGetDimensions(pix, &w, &h, &d); if (x < 0 || x >= w) return ERROR_INT("x out of bounds", procName, 1); if (y < 0 || y >= h) return ERROR_INT("y out of bounds", procName, 1); wpl = pixGetWpl(pix); data = pixGetData(pix); line = data + y * wpl; switch (d) { case 1: CLEAR_DATA_BIT(line, x); break; case 2: CLEAR_DATA_DIBIT(line, x); break; case 4: CLEAR_DATA_QBIT(line, x); break; case 8: SET_DATA_BYTE(line, x, 0); break; case 16: SET_DATA_TWO_BYTES(line, x, 0); break; case 32: line[x] = 0; break; default: return ERROR_INT("depth must be in {1,2,4,8,16,32} bpp", procName, 1); } return 0; } /*! * pixFlipPixel() * * Input: pix * (x,y) pixel coords * Return: 0 if OK; 1 on error */ l_int32 pixFlipPixel(PIX *pix, l_int32 x, l_int32 y) { l_int32 w, h, d, wpl; l_uint32 val; l_uint32 *line, *data; PROCNAME("pixFlipPixel"); if (!pix) return ERROR_INT("pix not defined", procName, 1); pixGetDimensions(pix, &w, &h, &d); if (x < 0 || x >= w) return ERROR_INT("x out of bounds", procName, 1); if (y < 0 || y >= h) return ERROR_INT("y out of bounds", procName, 1); data = pixGetData(pix); wpl = pixGetWpl(pix); line = data + y * wpl; switch (d) { case 1: val = GET_DATA_BIT(line, x); if (val) CLEAR_DATA_BIT(line, x); else SET_DATA_BIT(line, x); break; case 2: val = GET_DATA_DIBIT(line, x); val ^= 0x3; SET_DATA_DIBIT(line, x, val); break; case 4: val = GET_DATA_QBIT(line, x); val ^= 0xf; SET_DATA_QBIT(line, x, val); break; case 8: val = GET_DATA_BYTE(line, x); val ^= 0xff; SET_DATA_BYTE(line, x, val); break; case 16: val = GET_DATA_TWO_BYTES(line, x); val ^= 0xffff; SET_DATA_TWO_BYTES(line, x, val); break; case 32: val = line[x] ^ 0xffffffff; line[x] = val; break; default: return ERROR_INT("depth must be in {1,2,4,8,16,32} bpp", procName, 1); } return 0; } /*! * setPixelLow() * * Input: line (ptr to beginning of line), * x (pixel location in line) * depth (bpp) * val (to be inserted) * Return: void * * Notes: * (1) Caution: input variables are not checked! */ void setPixelLow(l_uint32 *line, l_int32 x, l_int32 depth, l_uint32 val) { switch (depth) { case 1: if (val) SET_DATA_BIT(line, x); else CLEAR_DATA_BIT(line, x); break; case 2: SET_DATA_DIBIT(line, x, val); break; case 4: SET_DATA_QBIT(line, x, val); break; case 8: SET_DATA_BYTE(line, x, val); break; case 16: SET_DATA_TWO_BYTES(line, x, val); break; case 32: line[x] = val; break; default: fprintf(stderr, "illegal depth in setPixelLow()\n"); } return; } /*-------------------------------------------------------------* * Full image clear/set/set-to-arbitrary-value/invert * *-------------------------------------------------------------*/ /*! * pixClearAll() * * Input: pix (all depths; use cmapped with caution) * Return: 0 if OK, 1 on error * * Notes: * (1) Clears all data to 0. For 1 bpp, this is white; for grayscale * or color, this is black. * (2) Caution: for colormapped pix, this sets the color to the first * one in the colormap. Be sure that this is the intended color! */ l_int32 pixClearAll(PIX *pix) { PROCNAME("pixClearAll"); if (!pix) return ERROR_INT("pix not defined", procName, 1); pixRasterop(pix, 0, 0, pixGetWidth(pix), pixGetHeight(pix), PIX_CLR, NULL, 0, 0); return 0; } /*! * pixSetAll() * * Input: pix (all depths; use cmapped with caution) * Return: 0 if OK, 1 on error * * Notes: * (1) Sets all data to 1. For 1 bpp, this is black; for grayscale * or color, this is white. * (2) Caution: for colormapped pix, this sets the pixel value to the * maximum value supported by the colormap: 2^d - 1. However, this * color may not be defined, because the colormap may not be full. */ l_int32 pixSetAll(PIX *pix) { l_int32 n; PIXCMAP *cmap; PROCNAME("pixSetAll"); if (!pix) return ERROR_INT("pix not defined", procName, 1); if ((cmap = pixGetColormap(pix)) != NULL) { n = pixcmapGetCount(cmap); if (n < cmap->nalloc) /* cmap is not full */ return ERROR_INT("cmap entry does not exist", procName, 1); } pixRasterop(pix, 0, 0, pixGetWidth(pix), pixGetHeight(pix), PIX_SET, NULL, 0, 0); return 0; } /*! * pixSetAllArbitrary() * * Input: pix (all depths; use cmapped with caution) * val (value to set all pixels) * Return: 0 if OK; 1 on error * * Notes: * (1) For colormapped pix, be sure the value is the intended * one in the colormap. * (2) Caution: for colormapped pix, this sets each pixel to the * color at the index equal to val. Be sure that this index * exists in the colormap and that it is the intended one! */ l_int32 pixSetAllArbitrary(PIX *pix, l_uint32 val) { l_int32 n, i, j, w, h, d, wpl, npix; l_uint32 maxval, wordval; l_uint32 *data, *line; PIXCMAP *cmap; PROCNAME("pixSetAllArbitrary"); if (!pix) return ERROR_INT("pix not defined", procName, 1); if ((cmap = pixGetColormap(pix)) != NULL) { n = pixcmapGetCount(cmap); if (val < 0) { L_WARNING("index not in colormap; using first color", procName); val = 0; } else if (val >= n) { L_WARNING("index not in colormap; using last color", procName); val = n - 1; } } pixGetDimensions(pix, &w, &h, &d); if (d == 32) maxval = 0xffffffff; else maxval = (1 << d) - 1; if (val < 0) { L_WARNING("invalid pixel value; set to 0", procName); val = 0; } if (val > maxval) { L_WARNING_INT("invalid pixel val; set to maxval = %d", procName, maxval); val = maxval; } /* Set up word to tile with */ wordval = 0; npix = 32 / d; /* number of pixels per 32 bit word */ for (j = 0; j < npix; j++) wordval |= (val << (j * d)); wpl = pixGetWpl(pix); data = pixGetData(pix); for (i = 0; i < h; i++) { line = data + i * wpl; for (j = 0; j < wpl; j++) { *(line + j) = wordval; } } return 0; } /*! * pixSetBlackOrWhite() * * Input: pixs (all depths; cmap ok) * op (L_SET_BLACK, L_SET_WHITE) * Return: 0 if OK; 1 on error * * Notes: * (1) Function for setting all pixels in an image to either black * or white. * (2) If pixs is colormapped, it adds black or white to the * colormap if it's not there and there is room. If the colormap * is full, it finds the closest color in intensity. * This index is written to all pixels. */ l_int32 pixSetBlackOrWhite(PIX *pixs, l_int32 op) { l_int32 d, index; PIXCMAP *cmap; PROCNAME("pixSetBlackOrWhite"); if (!pixs) return ERROR_INT("pix not defined", procName, 1); if (op != L_SET_BLACK && op != L_SET_WHITE) return ERROR_INT("invalid op", procName, 1); cmap = pixGetColormap(pixs); d = pixGetDepth(pixs); if (!cmap) { if ((d == 1 && op == L_SET_BLACK) || (d > 1 && op == L_SET_WHITE)) pixSetAll(pixs); else pixClearAll(pixs); } else { /* handle colormap */ if (op == L_SET_BLACK) pixcmapAddBlackOrWhite(cmap, 0, &index); else /* L_SET_WHITE */ pixcmapAddBlackOrWhite(cmap, 1, &index); pixSetAllArbitrary(pixs, index); } return 0; } /*-------------------------------------------------------------* * Rectangular region clear/set/set-to-arbitrary-value * *-------------------------------------------------------------*/ /*! * pixClearInRect() * * Input: pix (all depths; can be cmapped) * box (in which all pixels will be cleared) * Return: 0 if OK, 1 on error * * Notes: * (1) Clears all data in rect to 0. For 1 bpp, this is white; * for grayscale or color, this is black. * (2) Caution: for colormapped pix, this sets the color to the first * one in the colormap. Be sure that this is the intended color! */ l_int32 pixClearInRect(PIX *pix, BOX *box) { l_int32 x, y, w, h; PROCNAME("pixClearInRect"); if (!pix) return ERROR_INT("pix not defined", procName, 1); if (!box) return ERROR_INT("box not defined", procName, 1); boxGetGeometry(box, &x, &y, &w, &h); pixRasterop(pix, x, y, w, h, PIX_CLR, NULL, 0, 0); return 0; } /*! * pixSetInRect() * * Input: pix (all depths, can be cmapped) * box (in which all pixels will be set) * Return: 0 if OK, 1 on error * * Notes: * (1) Sets all data in rect to 1. For 1 bpp, this is black; * for grayscale or color, this is white. * (2) Caution: for colormapped pix, this sets the pixel value to the * maximum value supported by the colormap: 2^d - 1. However, this * color may not be defined, because the colormap may not be full. */ l_int32 pixSetInRect(PIX *pix, BOX *box) { l_int32 n, x, y, w, h; PIXCMAP *cmap; PROCNAME("pixSetInRect"); if (!pix) return ERROR_INT("pix not defined", procName, 1); if (!box) return ERROR_INT("box not defined", procName, 1); if ((cmap = pixGetColormap(pix)) != NULL) { n = pixcmapGetCount(cmap); if (n < cmap->nalloc) /* cmap is not full */ return ERROR_INT("cmap entry does not exist", procName, 1); } boxGetGeometry(box, &x, &y, &w, &h); pixRasterop(pix, x, y, w, h, PIX_SET, NULL, 0, 0); return 0; } /*! * pixSetInRectArbitrary() * * Input: pix (all depths; can be cmapped) * box (in which all pixels will be set to val) * val (value to set all pixels) * Return: 0 if OK; 1 on error * * Notes: * (1) For colormapped pix, be sure the value is the intended * one in the colormap. * (2) Caution: for colormapped pix, this sets each pixel in the * rect to the color at the index equal to val. Be sure that * this index exists in the colormap and that it is the intended one! */ l_int32 pixSetInRectArbitrary(PIX *pix, BOX *box, l_uint32 val) { l_int32 n, x, y, xstart, xend, ystart, yend, bw, bh, w, h, d, wpl, maxval; l_uint32 *data, *line; BOX *boxc; PIXCMAP *cmap; PROCNAME("pixSetInRectArbitrary"); if (!pix) return ERROR_INT("pix not defined", procName, 1); if (!box) return ERROR_INT("box not defined", procName, 1); pixGetDimensions(pix, &w, &h, &d); if (d != 1 && d != 2 && d != 4 && d !=8 && d != 16 && d != 32) return ERROR_INT("depth must be in {1,2,4,8,16,32} bpp", procName, 1); if ((cmap = pixGetColormap(pix)) != NULL) { n = pixcmapGetCount(cmap); if (val < 0) { L_WARNING("index not in colormap; using first color", procName); val = 0; } else if (val >= n) { L_WARNING("index not in colormap; using last color", procName); val = n - 1; } } if (d == 32) maxval = 0xffffffff; else maxval = (1 << d) - 1; if (val < 0) { L_WARNING("invalid pixel value; set to 0", procName); val = 0; } if (val > maxval) { L_WARNING_INT("invalid pixel val; set to maxval = %d", procName, maxval); val = maxval; } /* Handle the simple cases: the min and max values */ if (val == 0) { pixClearInRect(pix, box); return 0; } if (d == 1 || (d == 2 && val == 3) || (d == 4 && val == 0xf) || (d == 8 && val == 0xff) || (d == 16 && val == 0xffff) || (d == 32 && ((val ^ 0xffffff00) >> 8 == 0))) { pixSetInRect(pix, box); return 0; } /* Find the overlap of box with the input pix */ if ((boxc = boxClipToRectangle(box, w, h)) == NULL) return ERROR_INT("no overlap of box with image", procName, 1); boxGetGeometry(boxc, &xstart, &ystart, &bw, &bh); xend = xstart + bw - 1; yend = ystart + bh - 1; boxDestroy(&boxc); wpl = pixGetWpl(pix); data = pixGetData(pix); for (y = ystart; y <= yend; y++) { line = data + y * wpl; for (x = xstart; x <= xend; x++) { switch(d) { case 2: SET_DATA_DIBIT(line, x, val); break; case 4: SET_DATA_QBIT(line, x, val); break; case 8: SET_DATA_BYTE(line, x, val); break; case 16: SET_DATA_TWO_BYTES(line, x, val); break; case 32: line[x] = val; break; default: return ERROR_INT("depth not 2|4|8|16|32 bpp", procName, 1); } } } return 0; } /*! * pixBlendInRect() * * Input: pixs (32 bpp rgb) * box ( in which all pixels will be blended) * val (blend value; 0xrrggbb00) * fract (fraction of color to be blended with each pixel in pixs) * Return: 0 if OK; 1 on error * * Notes: * (1) This is an in-place function. It blends the input color @val * with the pixels in pixs in the specified rectangle. * If no rectangle is specified, it blends over the entire image. */ l_int32 pixBlendInRect(PIX *pixs, BOX *box, l_uint32 val, l_float32 fract) { l_int32 i, j, bx, by, bw, bh, w, h, wpls; l_int32 prval, pgval, pbval, rval, gval, bval; l_uint32 val32; l_uint32 *datas, *lines; PROCNAME("pixBlendInRect"); if (!pixs || pixGetDepth(pixs) != 32) return ERROR_INT("pixs not defined or not 32 bpp", procName, 1); extractRGBValues(val, &rval, &gval, &bval); pixGetDimensions(pixs, &w, &h, NULL); datas = pixGetData(pixs); wpls = pixGetWpl(pixs); if (!box) { for (i = 0; i < h; i++) { /* scan over box */ lines = datas + i * wpls; for (j = 0; j < w; j++) { val32 = *(lines + j); extractRGBValues(val32, &prval, &pgval, &pbval); prval = (l_int32)((1. - fract) * prval + fract * rval); pgval = (l_int32)((1. - fract) * pgval + fract * gval); pbval = (l_int32)((1. - fract) * pbval + fract * bval); composeRGBPixel(prval, pgval, pbval, &val32); *(lines + j) = val32; } } return 0; } boxGetGeometry(box, &bx, &by, &bw, &bh); for (i = 0; i < bh; i++) { /* scan over box */ if (by + i < 0 || by + i >= h) continue; lines = datas + (by + i) * wpls; for (j = 0; j < bw; j++) { if (bx + j < 0 || bx + j >= w) continue; val32 = *(lines + bx + j); extractRGBValues(val32, &prval, &pgval, &pbval); prval = (l_int32)((1. - fract) * prval + fract * rval); pgval = (l_int32)((1. - fract) * pgval + fract * gval); pbval = (l_int32)((1. - fract) * pbval + fract * bval); composeRGBPixel(prval, pgval, pbval, &val32); *(lines + bx + j) = val32; } } return 0; } /*-------------------------------------------------------------* * Set pad bits * *-------------------------------------------------------------*/ /*! * pixSetPadBits() * * Input: pix (1, 2, 4, 8, 16, 32 bpp) * val (0 or 1) * Return: 0 if OK; 1 on error * * Notes: * (1) The pad bits are the bits that expand each scanline to a * multiple of 32 bits. They are usually not used in * image processing operations. When boundary conditions * are important, as in seedfill, they must be set properly. * (2) This sets the value of the pad bits (if any) in the last * 32-bit word in each scanline. * (3) For 32 bpp pix, there are no pad bits, so this is a no-op. */ l_int32 pixSetPadBits(PIX *pix, l_int32 val) { l_int32 i, w, h, d, wpl, endbits, fullwords; l_uint32 mask; l_uint32 *data, *pword; PROCNAME("pixSetPadBits"); if (!pix) return ERROR_INT("pix not defined", procName, 1); pixGetDimensions(pix, &w, &h, &d); if (d == 32) /* no padding exists for 32 bpp */ return 0; data = pixGetData(pix); wpl = pixGetWpl(pix); endbits = 32 - ((w * d) % 32); if (endbits == 32) /* no partial word */ return 0; fullwords = w * d / 32; mask = rmask32[endbits]; if (val == 0) mask = ~mask; for (i = 0; i < h; i++) { pword = data + i * wpl + fullwords; if (val == 0) /* clear */ *pword = *pword & mask; else /* set */ *pword = *pword | mask; } return 0; } /*! * pixSetPadBitsBand() * * Input: pix (1, 2, 4, 8, 16, 32 bpp) * by (starting y value of band) * bh (height of band) * val (0 or 1) * Return: 0 if OK; 1 on error * * Notes: * (1) The pad bits are the bits that expand each scanline to a * multiple of 32 bits. They are usually not used in * image processing operations. When boundary conditions * are important, as in seedfill, they must be set properly. * (2) This sets the value of the pad bits (if any) in the last * 32-bit word in each scanline, within the specified * band of raster lines. * (3) For 32 bpp pix, there are no pad bits, so this is a no-op. */ l_int32 pixSetPadBitsBand(PIX *pix, l_int32 by, l_int32 bh, l_int32 val) { l_int32 i, w, h, d, wpl, endbits, fullwords; l_uint32 mask; l_uint32 *data, *pword; PROCNAME("pixSetPadBitsBand"); if (!pix) return ERROR_INT("pix not defined", procName, 1); pixGetDimensions(pix, &w, &h, &d); if (d == 32) /* no padding exists for 32 bpp */ return 0; if (by < 0) by = 0; if (by >= h) return ERROR_INT("start y not in image", procName, 1); if (by + bh > h) bh = h - by; data = pixGetData(pix); wpl = pixGetWpl(pix); endbits = 32 - ((w * d) % 32); if (endbits == 32) /* no partial word */ return 0; fullwords = w * d / 32; mask = rmask32[endbits]; if (val == 0) mask = ~mask; for (i = by; i < by + bh; i++) { pword = data + i * wpl + fullwords; if (val == 0) /* clear */ *pword = *pword & mask; else /* set */ *pword = *pword | mask; } return 0; } /*-------------------------------------------------------------* * Set border pixels * *-------------------------------------------------------------*/ /*! * pixSetOrClearBorder() * * Input: pixs (all depths) * left, right, top, bot (amount to set or clear) * operation (PIX_SET or PIX_CLR) * Return: 0 if OK; 1 on error * * Notes: * (1) The border region is defined to be the region in the * image within a specific distance of each edge. Here, we * allow the pixels within a specified distance of each * edge to be set independently. This either sets or * clears all pixels in the border region. * (2) For binary images, use PIX_SET for black and PIX_CLR for white. * (3) For grayscale or color images, use PIX_SET for white * and PIX_CLR for black. */ l_int32 pixSetOrClearBorder(PIX *pixs, l_int32 left, l_int32 right, l_int32 top, l_int32 bot, l_int32 op) { l_int32 w, h; PROCNAME("pixSetOrClearBorder"); if (!pixs) return ERROR_INT("pixs not defined", procName, 1); if (op != PIX_SET && op != PIX_CLR) return ERROR_INT("op must be PIX_SET or PIX_CLR", procName, 1); pixGetDimensions(pixs, &w, &h, NULL); pixRasterop(pixs, 0, 0, left, h, op, NULL, 0, 0); pixRasterop(pixs, w - right, 0, right, h, op, NULL, 0, 0); pixRasterop(pixs, 0, 0, w, top, op, NULL, 0, 0); pixRasterop(pixs, 0, h - bot, w, bot, op, NULL, 0, 0); return 0; } /*! * pixSetBorderVal() * * Input: pixs (8, 16 or 32 bpp) * left, right, top, bot (amount to set) * val (value to set at each border pixel) * Return: 0 if OK; 1 on error * * Notes: * (1) The border region is defined to be the region in the * image within a specific distance of each edge. Here, we * allow the pixels within a specified distance of each * edge to be set independently. This sets the pixels * in the border region to the given input value. * (2) For efficiency, use pixSetOrClearBorder() if * you're setting the border to either black or white. * (3) If d != 32, the input value should be masked off * to the appropriate number of least significant bits. * (4) The code is easily generalized for 2 or 4 bpp. */ l_int32 pixSetBorderVal(PIX *pixs, l_int32 left, l_int32 right, l_int32 top, l_int32 bot, l_uint32 val) { l_int32 w, h, d, wpls, i, j, bstart, rstart; l_uint32 *datas, *lines; PROCNAME("pixSetBorderVal"); if (!pixs) return ERROR_INT("pixs not defined", procName, 1); pixGetDimensions(pixs, &w, &h, &d); if (d != 8 && d != 16 && d != 32) return ERROR_INT("depth must be 8, 16 or 32 bpp", procName, 1); datas = pixGetData(pixs); wpls = pixGetWpl(pixs); if (d == 8) { val &= 0xff; for (i = 0; i < top; i++) { lines = datas + i * wpls; for (j = 0; j < w; j++) SET_DATA_BYTE(lines, j, val); } rstart = w - right; bstart = h - bot; for (i = top; i < bstart; i++) { lines = datas + i * wpls; for (j = 0; j < left; j++) SET_DATA_BYTE(lines, j, val); for (j = rstart; j < w; j++) SET_DATA_BYTE(lines, j, val); } for (i = bstart; i < h; i++) { lines = datas + i * wpls; for (j = 0; j < w; j++) SET_DATA_BYTE(lines, j, val); } } else if (d == 16) { val &= 0xffff; for (i = 0; i < top; i++) { lines = datas + i * wpls; for (j = 0; j < w; j++) SET_DATA_TWO_BYTES(lines, j, val); } rstart = w - right; bstart = h - bot; for (i = top; i < bstart; i++) { lines = datas + i * wpls; for (j = 0; j < left; j++) SET_DATA_TWO_BYTES(lines, j, val); for (j = rstart; j < w; j++) SET_DATA_TWO_BYTES(lines, j, val); } for (i = bstart; i < h; i++) { lines = datas + i * wpls; for (j = 0; j < w; j++) SET_DATA_TWO_BYTES(lines, j, val); } } else { /* d == 32 */ for (i = 0; i < top; i++) { lines = datas + i * wpls; for (j = 0; j < w; j++) *(lines + j) = val; } rstart = w - right; bstart = h - bot; for (i = top; i < bstart; i++) { lines = datas + i * wpls; for (j = 0; j < left; j++) *(lines + j) = val; for (j = rstart; j < w; j++) *(lines + j) = val; } for (i = bstart; i < h; i++) { lines = datas + i * wpls; for (j = 0; j < w; j++) *(lines + j) = val; } } return 0; } /*! * pixSetBorderRingVal() * * Input: pixs (any depth; cmap OK) * dist (distance from outside; must be > 0; first ring is 1) * val (value to set at each border pixel) * Return: 0 if OK; 1 on error * * Notes: * (1) The rings are single-pixel-wide rectangular sets of * pixels at a given distance from the edge of the pix. * This sets all pixels in a given ring to a value. */ l_int32 pixSetBorderRingVal(PIX *pixs, l_int32 dist, l_uint32 val) { l_int32 w, h, d, i, j, xend, yend; PROCNAME("pixSetBorderRingVal"); if (!pixs) return ERROR_INT("pixs not defined", procName, 1); if (dist < 1) return ERROR_INT("dist must be > 0", procName, 1); pixGetDimensions(pixs, &w, &h, &d); if (w < 2 * dist + 1 || h < 2 * dist + 1) return ERROR_INT("ring doesn't exist", procName, 1); if (d < 32 && (val >= (1 << d))) return ERROR_INT("invalid pixel value", procName, 1); xend = w - dist; yend = h - dist; for (j = dist - 1; j <= xend; j++) pixSetPixel(pixs, j, dist - 1, val); for (j = dist - 1; j <= xend; j++) pixSetPixel(pixs, j, yend, val); for (i = dist - 1; i <= yend; i++) pixSetPixel(pixs, dist - 1, i, val); for (i = dist - 1; i <= yend; i++) pixSetPixel(pixs, xend, i, val); return 0; } /*! * pixSetMirroredBorder() * * Input: pixs (all depths; colormap ok) * left, right, top, bot (number of pixels to set) * Return: 0 if OK, 1 on error * * Notes: * (1) This applies what is effectively mirror boundary conditions * to a border region in the image. It is in-place. * (2) This is useful for setting pixels near the border to a * value representative of the near pixels to the interior. * (3) The general pixRasterop() is used for an in-place operation here * because there is no overlap between the src and dest rectangles. */ l_int32 pixSetMirroredBorder(PIX *pixs, l_int32 left, l_int32 right, l_int32 top, l_int32 bot) { l_int32 i, j, w, h; PROCNAME("pixSetMirroredBorder"); if (!pixs) return ERROR_INT("pixs not defined", procName, 1); pixGetDimensions(pixs, &w, &h, NULL); for (j = 0; j < left; j++) pixRasterop(pixs, left - 1 - j, top, 1, h - top - bot, PIX_SRC, pixs, left + j, top); for (j = 0; j < right; j++) pixRasterop(pixs, w - right + j, top, 1, h - top - bot, PIX_SRC, pixs, w - right - 1 - j, top); for (i = 0; i < top; i++) pixRasterop(pixs, 0, top - 1 - i, w, 1, PIX_SRC, pixs, 0, top + i); for (i = 0; i < bot; i++) pixRasterop(pixs, 0, h - bot + i, w, 1, PIX_SRC, pixs, 0, h - bot - 1 - i); return 0; } /*! * pixCopyBorder() * * Input: pixd (all depths; colormap ok; can be NULL) * pixs (same depth and size as pixd) * left, right, top, bot (number of pixels to copy) * Return: pixd, or null on error if pixd is not defined * * Notes: * (1) pixd can be null, but otherwise it must be the same size * and depth as pixs. Always returns pixd. * (1) This is useful in situations where by setting a few border * pixels we can avoid having to copy all pixels in pixs into * pixd as an initialization step for some operation. */ PIX * pixCopyBorder(PIX *pixd, PIX *pixs, l_int32 left, l_int32 right, l_int32 top, l_int32 bot) { l_int32 w, h; PROCNAME("pixCopyBorder"); if (!pixs) return (PIX *)ERROR_PTR("pixs not defined", procName, pixd); if (pixd) { if (pixd == pixs) { L_WARNING("same: nothing to do", procName); return pixd; } else if (!pixSizesEqual(pixs, pixd)) return (PIX *)ERROR_PTR("pixs and pixd sizes differ", procName, pixd); } else { if ((pixd = pixCreateTemplateNoInit(pixs)) == NULL) return (PIX *)ERROR_PTR("pixd not made", procName, pixd); } pixGetDimensions(pixs, &w, &h, NULL); pixRasterop(pixd, 0, 0, left, h, PIX_SRC, pixs, 0, 0); pixRasterop(pixd, w - right, 0, right, h, PIX_SRC, pixs, w - right, 0); pixRasterop(pixd, 0, 0, w, top, PIX_SRC, pixs, 0, 0); pixRasterop(pixd, 0, h - bot, w, bot, PIX_SRC, pixs, 0, h - bot); return pixd; } /*-------------------------------------------------------------* * Add and remove border * *-------------------------------------------------------------*/ /*! * pixAddBorder() * * Input: pixs (all depths; colormap ok) * npix (number of pixels to be added to each side) * val (value of added border pixels) * Return: pixd (with the added exterior pixels), or null on error * * Notes: * (1) See pixAddBorderGeneral() for values of white & black pixels. */ PIX * pixAddBorder(PIX *pixs, l_int32 npix, l_uint32 val) { PROCNAME("pixAddBorder"); if (!pixs) return (PIX *)ERROR_PTR("pixs not defined", procName, NULL); if (npix == 0) return pixClone(pixs); return pixAddBorderGeneral(pixs, npix, npix, npix, npix, val); } /*! * pixAddBlackBorder() * * Input: pixs (all depths; colormap ok) * npix (number of pixels to be added to each side) * Return: pixd (with the added exterior pixels), or null on error */ PIX * pixAddBlackBorder(PIX *pixs, l_int32 npix) { l_int32 d, val; PIXCMAP *cmap; PROCNAME("pixAddBlackBorder"); if (!pixs) return (PIX *)ERROR_PTR("pixs not defined", procName, NULL); if (npix == 0) return pixClone(pixs); if ((cmap = pixGetColormap(pixs)) != NULL) pixcmapGetRankIntensity(cmap, 0.0, &val); else { d = pixGetDepth(pixs); val = (d == 1) ? 1 : 0; } return pixAddBorderGeneral(pixs, npix, npix, npix, npix, val); } /*! * pixAddBorderGeneral() * * Input: pixs (all depths; colormap ok) * left, right, top, bot (number of pixels added) * val (value of added border pixels) * Return: pixd (with the added exterior pixels), or null on error * * Notes: * (1) For binary images: * white: val = 0 * black: val = 1 * For grayscale images: * white: val = 2 ** d - 1 * black: val = 0 * For rgb color images: * white: val = 0xffffff00 * black: val = 0 * For colormapped images, use 'index' found this way: * white: pixcmapGetRankIntensity(cmap, 1.0, &index); * black: pixcmapGetRankIntensity(cmap, 0.0, &index); */ PIX * pixAddBorderGeneral(PIX *pixs, l_int32 left, l_int32 right, l_int32 top, l_int32 bot, l_uint32 val) { l_int32 ws, hs, wd, hd, d, op; PIX *pixd; PROCNAME("pixAddBorderGeneral"); if (!pixs) return (PIX *)ERROR_PTR("pixs not defined", procName, NULL); if (left < 0 || right < 0 || top < 0 || bot < 0) return (PIX *)ERROR_PTR("negative border added!", procName, NULL); pixGetDimensions(pixs, &ws, &hs, &d); wd = ws + left + right; hd = hs + top + bot; if ((pixd = pixCreateNoInit(wd, hd, d)) == NULL) return (PIX *)ERROR_PTR("pixd not made", procName, NULL); pixCopyResolution(pixd, pixs); pixCopyColormap(pixd, pixs); /* Set the new border pixels */ op = UNDEF; if (val == 0) op = PIX_CLR; else if ((d == 1 && val == 1) || (d == 2 && val == 3) || (d == 4 && val == 0xf) || (d == 8 && val == 0xff) || (d == 16 && val == 0xffff) || (d == 32 && (val >> 8) == 0xffffff)) op = PIX_SET; if (op == UNDEF) pixSetAllArbitrary(pixd, val); /* a little extra writing ! */ else { pixRasterop(pixd, 0, 0, left, hd, op, NULL, 0, 0); pixRasterop(pixd, wd - right, 0, right, hd, op, NULL, 0, 0); pixRasterop(pixd, 0, 0, wd, top, op, NULL, 0, 0); pixRasterop(pixd, 0, hd - bot, wd, bot, op, NULL, 0, 0); } /* Copy pixs into the interior */ pixRasterop(pixd, left, top, ws, hs, PIX_SRC, pixs, 0, 0); return pixd; } /*! * pixRemoveBorder() * * Input: pixs (all depths; colormap ok) * npix (number to be removed from each of the 4 sides) * Return: pixd (with pixels removed around border), or null on error */ PIX * pixRemoveBorder(PIX *pixs, l_int32 npix) { PROCNAME("pixRemoveBorder"); if (!pixs) return (PIX *)ERROR_PTR("pixs not defined", procName, NULL); if (npix == 0) return pixClone(pixs); return pixRemoveBorderGeneral(pixs, npix, npix, npix, npix); } /*! * pixRemoveBorderGeneral() * * Input: pixs (all depths; colormap ok) * left, right, top, bot (number of pixels added) * Return: pixd (with pixels removed around border), or null on error */ PIX * pixRemoveBorderGeneral(PIX *pixs, l_int32 left, l_int32 right, l_int32 top, l_int32 bot) { l_int32 ws, hs, wd, hd, d; PIX *pixd; PROCNAME("pixRemoveBorderGeneral"); if (!pixs) return (PIX *)ERROR_PTR("pixs not defined", procName, NULL); if (left < 0 || right < 0 || top < 0 || bot < 0) return (PIX *)ERROR_PTR("negative border removed!", procName, NULL); pixGetDimensions(pixs, &ws, &hs, &d); wd = ws - left - right; hd = hs - top - bot; if (wd <= 0) return (PIX *)ERROR_PTR("width must be > 0", procName, NULL); if (hd <= 0) return (PIX *)ERROR_PTR("height must be > 0", procName, NULL); if ((pixd = pixCreateNoInit(wd, hd, d)) == NULL) return (PIX *)ERROR_PTR("pixd not made", procName, NULL); pixCopyResolution(pixd, pixs); pixCopyColormap(pixd, pixs); pixRasterop(pixd, 0, 0, wd, hd, PIX_SRC, pixs, left, top); return pixd; } /*! * pixAddMirroredBorder() * * Input: pixs (all depths; colormap ok) * left, right, top, bot (number of pixels added) * Return: pixd, or null on error * * Notes: * (1) This applies what is effectively mirror boundary conditions. * For the added border pixels in pixd, the pixels in pixs * near the border are mirror-copied into the border region. * (2) This is useful for avoiding special operations near * boundaries when doing image processing operations * such as rank filters and convolution. In use, one first * adds mirrored pixels to each side of the image. The number * of pixels added on each side is half the filter dimension. * Then the image processing operations proceed over a * region equal to the size of the original image, and * write directly into a dest pix of the same size as pixs. * (3) The general pixRasterop() is used for an in-place operation here * because there is no overlap between the src and dest rectangles. */ PIX * pixAddMirroredBorder(PIX *pixs, l_int32 left, l_int32 right, l_int32 top, l_int32 bot) { l_int32 i, j, w, h; PIX *pixd; PROCNAME("pixAddMirroredBorder"); if (!pixs) return (PIX *)ERROR_PTR("pixs not defined", procName, NULL); pixGetDimensions(pixs, &w, &h, NULL); if (left > w || right > w || top > h || bot > h) return (PIX *)ERROR_PTR("border too large", procName, NULL); /* Set pixels on left, right, top and bottom, in that order */ pixd = pixAddBorderGeneral(pixs, left, right, top, bot, 0); for (j = 0; j < left; j++) pixRasterop(pixd, left - 1 - j, top, 1, h, PIX_SRC, pixd, left + j, top); for (j = 0; j < right; j++) pixRasterop(pixd, left + w + j, top, 1, h, PIX_SRC, pixd, left + w - 1 - j, top); for (i = 0; i < top; i++) pixRasterop(pixd, 0, top - 1 - i, left + w + right, 1, PIX_SRC, pixd, 0, top + i); for (i = 0; i < bot; i++) pixRasterop(pixd, 0, top + h + i, left + w + right, 1, PIX_SRC, pixd, 0, top + h - 1 - i); return pixd; } /*! * pixAddRepeatedBorder() * * Input: pixs (all depths; colormap ok) * left, right, top, bot (number of pixels added) * Return: pixd, or null on error * * Notes: * (1) This applies a repeated border, as if the central part of * the image is tiled over the plane. So, for example, the * pixels in the left border come from the right side of the image. * (2) The general pixRasterop() is used for an in-place operation here * because there is no overlap between the src and dest rectangles. */ PIX * pixAddRepeatedBorder(PIX *pixs, l_int32 left, l_int32 right, l_int32 top, l_int32 bot) { l_int32 w, h; PIX *pixd; PROCNAME("pixAddRepeatedBorder"); if (!pixs) return (PIX *)ERROR_PTR("pixs not defined", procName, NULL); pixGetDimensions(pixs, &w, &h, NULL); if (left > w || right > w || top > h || bot > h) return (PIX *)ERROR_PTR("border too large", procName, NULL); pixd = pixAddBorderGeneral(pixs, left, right, top, bot, 0); /* Set pixels on left, right, top and bottom, in that order */ pixRasterop(pixd, 0, top, left, h, PIX_SRC, pixd, w, top); pixRasterop(pixd, left + w, top, right, h, PIX_SRC, pixd, left, top); pixRasterop(pixd, 0, 0, left + w + right, top, PIX_SRC, pixd, 0, h); pixRasterop(pixd, 0, top + h, left + w + right, bot, PIX_SRC, pixd, 0, top); return pixd; } /*! * pixAddMixedBorder() * * Input: pixs (all depths; colormap ok) * left, right, top, bot (number of pixels added) * Return: pixd, or null on error * * Notes: * (1) This applies mirrored boundary conditions horizontally * and repeated b.c. vertically. * (2) It is specifically used for avoiding special operations * near boundaries when convolving a hue-saturation histogram * with a given window size. The repeated b.c. are used * vertically for hue, and the mirrored b.c. are used * horizontally for saturation. The number of pixels added * on each side is approximately (but not quite) half the * filter dimension. The image processing operations can * then proceed over a region equal to the size of the original * image, and write directly into a dest pix of the same * size as pixs. * (3) The general pixRasterop() can be used for an in-place * operation here because there is no overlap between the * src and dest rectangles. */ PIX * pixAddMixedBorder(PIX *pixs, l_int32 left, l_int32 right, l_int32 top, l_int32 bot) { l_int32 j, w, h; PIX *pixd; PROCNAME("pixAddMixedBorder"); if (!pixs) return (PIX *)ERROR_PTR("pixs not defined", procName, NULL); pixGetDimensions(pixs, &w, &h, NULL); if (left > w || right > w || top > h || bot > h) return (PIX *)ERROR_PTR("border too large", procName, NULL); /* Set mirrored pixels on left and right; * then set repeated pixels on top and bottom. */ pixd = pixAddBorderGeneral(pixs, left, right, top, bot, 0); for (j = 0; j < left; j++) pixRasterop(pixd, left - 1 - j, top, 1, h, PIX_SRC, pixd, left + j, top); for (j = 0; j < right; j++) pixRasterop(pixd, left + w + j, top, 1, h, PIX_SRC, pixd, left + w - 1 - j, top); pixRasterop(pixd, 0, 0, left + w + right, top, PIX_SRC, pixd, 0, h); pixRasterop(pixd, 0, top + h, left + w + right, bot, PIX_SRC, pixd, 0, top); return pixd; } /*-------------------------------------------------------------* * Color sample setting and extraction * *-------------------------------------------------------------*/ /*! * pixCreateRGBImage() * * Input: 8 bpp red pix * 8 bpp green pix * 8 bpp blue pix * Return: 32 bpp pix, interleaved with 4 samples/pixel, * or null on error * * Notes: * (1) the 4th byte, sometimes called the "alpha channel", * and which is often used for blending between different * images, is left with 0 value. * (2) see Note (4) in pix.h for details on storage of * 8-bit samples within each 32-bit word. * (3) This implementation, setting the r, g and b components * sequentially, is much faster than setting them in parallel * by constructing an RGB dest pixel and writing it to dest. * The reason is there are many more cache misses when reading * from 3 input images simultaneously. */ PIX * pixCreateRGBImage(PIX *pixr, PIX *pixg, PIX *pixb) { l_int32 wr, wg, wb, hr, hg, hb, dr, dg, db; PIX *pixd; PROCNAME("pixCreateRGBImage"); if (!pixr) return (PIX *)ERROR_PTR("pixr not defined", procName, NULL); if (!pixg) return (PIX *)ERROR_PTR("pixg not defined", procName, NULL); if (!pixb) return (PIX *)ERROR_PTR("pixb not defined", procName, NULL); pixGetDimensions(pixr, &wr, &hr, &dr); pixGetDimensions(pixg, &wg, &hg, &dg); pixGetDimensions(pixb, &wb, &hb, &db); if (dr != 8 || dg != 8 || db != 8) return (PIX *)ERROR_PTR("input pix not all 8 bpp", procName, NULL); if (wr != wg || wr != wb) return (PIX *)ERROR_PTR("widths not the same", procName, NULL); if (hr != hg || hr != hb) return (PIX *)ERROR_PTR("heights not the same", procName, NULL); if ((pixd = pixCreate(wr, hr, 32)) == NULL) return (PIX *)ERROR_PTR("pixd not made", procName, NULL); pixCopyResolution(pixd, pixr); pixSetRGBComponent(pixd, pixr, COLOR_RED); pixSetRGBComponent(pixd, pixg, COLOR_GREEN); pixSetRGBComponent(pixd, pixb, COLOR_BLUE); return pixd; } /*! * pixGetRGBComponent() * * Input: pixs (32 bpp) * color (one of {COLOR_RED, COLOR_GREEN, COLOR_BLUE, * L_ALPHA_CHANNEL}) * Return: pixd, the selected 8 bpp component image of the * input 32 bpp image, or null on error * * Notes: * (1) The alpha channel (in the 4th byte of each RGB pixel) * is mostly ignored in leptonica. * (2) Three calls to this function generate the three 8 bpp component * images. This is much faster than generating the three * images in parallel, by extracting a src pixel and setting * the pixels of each component image from it. The reason is * there are many more cache misses when writing to three * output images simultaneously. */ PIX * pixGetRGBComponent(PIX *pixs, l_int32 color) { l_uint8 srcbyte; l_uint32 *lines, *lined; l_uint32 *datas, *datad; l_int32 i, j, w, h; l_int32 wpls, wpld; PIX *pixd; PROCNAME("pixGetRGBComponent"); if (!pixs) return (PIX *)ERROR_PTR("pixs not defined", procName, NULL); if (pixGetDepth(pixs) != 32) return (PIX *)ERROR_PTR("pixs not 32 bpp", procName, NULL); if (color != COLOR_RED && color != COLOR_GREEN && color != COLOR_BLUE && color != L_ALPHA_CHANNEL) return (PIX *)ERROR_PTR("invalid color", procName, NULL); pixGetDimensions(pixs, &w, &h, NULL); if ((pixd = pixCreate(w, h, 8)) == NULL) return (PIX *)ERROR_PTR("pixd not made", procName, NULL); pixCopyResolution(pixd, pixs); wpls = pixGetWpl(pixs); wpld = pixGetWpl(pixd); datas = pixGetData(pixs); datad = pixGetData(pixd); for (i = 0; i < h; i++) { lines = datas + i * wpls; lined = datad + i * wpld; for (j = 0; j < w; j++) { srcbyte = GET_DATA_BYTE(lines + j, color); SET_DATA_BYTE(lined, j, srcbyte); } } return pixd; } /*! * pixSetRGBComponent() * * Input: pixd (32 bpp) * pixs (8 bpp) * color (one of {COLOR_RED, COLOR_GREEN, COLOR_BLUE, * L_ALPHA_CHANNEL}) * Return: 0 if OK; 1 on error * * Notes: * (1) This places the 8 bpp pixel in pixs into the * specified color component (properly interleaved) in pixd. * (2) The alpha channel component mostly ignored in leptonica. */ l_int32 pixSetRGBComponent(PIX *pixd, PIX *pixs, l_int32 color) { l_uint8 srcbyte; l_int32 i, j, w, h; l_int32 wpls, wpld; l_uint32 *lines, *lined; l_uint32 *datas, *datad; PROCNAME("pixSetRGBComponent"); if (!pixd) return ERROR_INT("pixd not defined", procName, 1); if (!pixs) return ERROR_INT("pixs not defined", procName, 1); if (pixGetDepth(pixd) != 32) return ERROR_INT("pixd not 32 bpp", procName, 1); if (pixGetDepth(pixs) != 8) return ERROR_INT("pixs not 8 bpp", procName, 1); if (color != COLOR_RED && color != COLOR_GREEN && color != COLOR_BLUE && color != L_ALPHA_CHANNEL) return ERROR_INT("invalid color", procName, 1); pixGetDimensions(pixs, &w, &h, NULL); if (w != pixGetWidth(pixd) || h != pixGetHeight(pixd)) return ERROR_INT("sizes not commensurate", procName, 1); datas = pixGetData(pixs); datad = pixGetData(pixd); wpls = pixGetWpl(pixs); wpld = pixGetWpl(pixd); for (i = 0; i < h; i++) { lines = datas + i * wpls; lined = datad + i * wpld; for (j = 0; j < w; j++) { srcbyte = GET_DATA_BYTE(lines, j); SET_DATA_BYTE(lined + j, color, srcbyte); } } return 0; } /*! * pixGetRGBComponentCmap() * * Input: pixs (colormapped) * color (one of {COLOR_RED, COLOR_GREEN, COLOR_BLUE}) * Return: pixd (the selected 8 bpp component image of the * input cmapped image), or null on error */ PIX * pixGetRGBComponentCmap(PIX *pixs, l_int32 color) { l_int32 i, j, w, h, val, index; l_int32 wplc, wpld; l_uint32 *linec, *lined; l_uint32 *datac, *datad; PIX *pixc, *pixd; PIXCMAP *cmap; RGBA_QUAD *cta; PROCNAME("pixGetRGBComponentCmap"); if (!pixs) return (PIX *)ERROR_PTR("pixs not defined", procName, NULL); if ((cmap = pixGetColormap(pixs)) == NULL) return (PIX *)ERROR_PTR("pixs not cmapped", procName, NULL); if (color != COLOR_RED && color != COLOR_GREEN && color != COLOR_BLUE) return (PIX *)ERROR_PTR("invalid color", procName, NULL); /* If not 8 bpp, make a cmapped 8 bpp pix */ if (pixGetDepth(pixs) == 8) pixc = pixClone(pixs); else pixc = pixConvertTo8(pixs, TRUE); pixGetDimensions(pixs, &w, &h, NULL); if ((pixd = pixCreateNoInit(w, h, 8)) == NULL) return (PIX *)ERROR_PTR("pixd not made", procName, NULL); pixCopyResolution(pixd, pixs); wplc = pixGetWpl(pixc); wpld = pixGetWpl(pixd); datac = pixGetData(pixc); datad = pixGetData(pixd); cta = (RGBA_QUAD *)cmap->array; for (i = 0; i < h; i++) { linec = datac + i * wplc; lined = datad + i * wpld; if (color == COLOR_RED) { for (j = 0; j < w; j++) { index = GET_DATA_BYTE(linec, j); val = cta[index].red; SET_DATA_BYTE(lined, j, val); } } else if (color == COLOR_GREEN) { for (j = 0; j < w; j++) { index = GET_DATA_BYTE(linec, j); val = cta[index].green; SET_DATA_BYTE(lined, j, val); } } else if (color == COLOR_BLUE) { for (j = 0; j < w; j++) { index = GET_DATA_BYTE(linec, j); val = cta[index].green; SET_DATA_BYTE(lined, j, val); } } } pixDestroy(&pixc); return pixd; } /*! * composeRGBPixel() * * Input: rval, gval, bval * &rgbpixel ( 32-bit pixel) * Return: 0 if OK; 1 on error * * Notes: * (1) A slower implementation uses macros: * SET_DATA_BYTE(ppixel, COLOR_RED, rval); * SET_DATA_BYTE(ppixel, COLOR_GREEN, gval); * SET_DATA_BYTE(ppixel, COLOR_BLUE, bval); */ l_int32 composeRGBPixel(l_int32 rval, l_int32 gval, l_int32 bval, l_uint32 *ppixel) { PROCNAME("composeRGBPixel"); if (!ppixel) return ERROR_INT("&pixel not defined", procName, 1); *ppixel = (rval << L_RED_SHIFT) | (gval << L_GREEN_SHIFT) | (bval << L_BLUE_SHIFT); return 0; } /*! * extractRGBValues() * * Input: pixel (32 bit) * &rval ( red component) * &gval ( green component) * &bval ( blue component) * Return: void * * Notes: * (1) A slower implementation uses macros: * *prval = GET_DATA_BYTE(&pixel, COLOR_RED); * *pgval = GET_DATA_BYTE(&pixel, COLOR_GREEN); * *pbval = GET_DATA_BYTE(&pixel, COLOR_BLUE); */ void extractRGBValues(l_uint32 pixel, l_int32 *prval, l_int32 *pgval, l_int32 *pbval) { if (prval) *prval = (pixel >> L_RED_SHIFT) & 0xff; if (pgval) *pgval = (pixel >> L_GREEN_SHIFT) & 0xff; if (pbval) *pbval = (pixel >> L_BLUE_SHIFT) & 0xff; return; } /*! * extractMinMaxComponent() * * Input: pixel (32 bpp RGB) * type (L_CHOOSE_MIN or L_CHOOSE_MAX) * Return: componet (in range [0 ... 255], or null on error */ l_int32 extractMinMaxComponent(l_uint32 pixel, l_int32 type) { l_int32 rval, gval, bval, val; extractRGBValues(pixel, &rval, &gval, &bval); if (type == L_CHOOSE_MIN) { val = L_MIN(rval, gval); val = L_MIN(val, bval); } else { /* type == L_CHOOSE_MAX */ val = L_MAX(rval, gval); val = L_MAX(val, bval); } return val; } /*! * pixGetRGBLine() * * Input: pixs (32 bpp) * row * bufr (array of red samples; size w bytes) * bufg (array of green samples; size w bytes) * bufb (array of blue samples; size w bytes) * Return: 0 if OK; 1 on error * * Notes: * (1) This puts rgb components from the input line in pixs * into the given buffers. */ l_int32 pixGetRGBLine(PIX *pixs, l_int32 row, l_uint8 *bufr, l_uint8 *bufg, l_uint8 *bufb) { l_uint32 *lines; l_int32 j, w, h; l_int32 wpls; PROCNAME("pixGetRGBLine"); if (!pixs) return ERROR_INT("pixs not defined", procName, 1); if (pixGetDepth(pixs) != 32) return ERROR_INT("pixs not 32 bpp", procName, 1); if (!bufr || !bufg || !bufb) return ERROR_INT("buffer not defined", procName, 1); pixGetDimensions(pixs, &w, &h, NULL); if (row < 0 || row >= h) return ERROR_INT("row out of bounds", procName, 1); wpls = pixGetWpl(pixs); lines = pixGetData(pixs) + row * wpls; for (j = 0; j < w; j++) { bufr[j] = GET_DATA_BYTE(lines + j, COLOR_RED); bufg[j] = GET_DATA_BYTE(lines + j, COLOR_GREEN); bufb[j] = GET_DATA_BYTE(lines + j, COLOR_BLUE); } return 0; } /*-------------------------------------------------------------* * Pixel endian conversion * *-------------------------------------------------------------*/ /*! * pixEndianByteSwapNew() * * Input: pixs * Return: pixd, or null on error * * Notes: * (1) This is used to convert the data in a pix to a * serialized byte buffer in raster order, and, for RGB, * in order RGBA. This requires flipping bytes within * each 32-bit word for little-endian platforms, because the * words have a MSB-to-the-left rule, whereas byte raster-order * requires the left-most byte in each word to be byte 0. * For big-endians, no swap is necessary, so this returns a clone. * (2) Unlike pixEndianByteSwap(), which swaps the bytes in-place, * this returns a new pix (or a clone). We provide this * because often when serialization is done, the source * pix needs to be restored to canonical little-endian order, * and this requires a second byte swap. In such a situation, * it is twice as fast to make a new pix in big-endian order, * use it, and destroy it. */ PIX * pixEndianByteSwapNew(PIX *pixs) { l_uint32 *datas, *datad; l_int32 i, j, h, wpl; l_uint32 word; PIX *pixd; PROCNAME("pixEndianByteSwapNew"); #ifdef L_BIG_ENDIAN return pixClone(pixs); #else /* L_LITTLE_ENDIAN */ if (!pixs) return (PIX *)ERROR_PTR("pixs not defined", procName, NULL); datas = pixGetData(pixs); wpl = pixGetWpl(pixs); h = pixGetHeight(pixs); pixd = pixCreateTemplate(pixs); datad = pixGetData(pixd); for (i = 0; i < h; i++) { for (j = 0; j < wpl; j++, datas++, datad++) { word = *datas; *datad = (word >> 24) | ((word >> 8) & 0x0000ff00) | ((word << 8) & 0x00ff0000) | (word << 24); } } return pixd; #endif /* L_BIG_ENDIAN */ } /*! * pixEndianByteSwap() * * Input: pixs * Return: 0 if OK, 1 on error * * Notes: * (1) This is used on little-endian platforms to swap * the bytes within a word; bytes 0 and 3 are swapped, * and bytes 1 and 2 are swapped. * (2) This is required for little-endians in situations * where we convert from a serialized byte order that is * in raster order, as one typically has in file formats, * to one with MSB-to-the-left in each 32-bit word, or v.v. * See pix.h for a description of the canonical format * (MSB-to-the left) that is used for both little-endian * and big-endian platforms. For big-endians, the * MSB-to-the-left word order has the bytes in raster * order when serialized, so no byte flipping is required. */ l_int32 pixEndianByteSwap(PIX *pixs) { l_uint32 *data; l_int32 i, j, h, wpl; l_uint32 word; PROCNAME("pixEndianByteSwap"); #ifdef L_BIG_ENDIAN return 0; #else /* L_LITTLE_ENDIAN */ if (!pixs) return ERROR_INT("pixs not defined", procName, 1); data = pixGetData(pixs); wpl = pixGetWpl(pixs); h = pixGetHeight(pixs); for (i = 0; i < h; i++) { for (j = 0; j < wpl; j++, data++) { word = *data; *data = (word >> 24) | ((word >> 8) & 0x0000ff00) | ((word << 8) & 0x00ff0000) | (word << 24); } } return 0; #endif /* L_BIG_ENDIAN */ } /*! * lineEndianByteSwap() * * Input datad (dest byte array data, reordered on little-endians) * datas (a src line of pix data) * wpl (number of 32 bit words in the line) * Return: 0 if OK, 1 on error * * Notes: * (1) This is used on little-endian platforms to swap * the bytes within each word in the line of image data. * Bytes 0 <==> 3 and 1 <==> 2 are swapped in the dest * byte array data8d, relative to the pix data in datas. * (2) The bytes represent 8 bit pixel values. They are swapped * for little endians so that when the dest array (char *)datad * is addressed by bytes, the pixels are chosen sequentially * from left to right in the image. */ l_int32 lineEndianByteSwap(l_uint32 *datad, l_uint32 *datas, l_int32 wpl) { l_int32 j; l_uint32 word; PROCNAME("lineEndianByteSwap"); if (!datad || !datas) return ERROR_INT("datad and datas not both defined", procName, 1); #ifdef L_BIG_ENDIAN memcpy((char *)datad, (char *)datas, 4 * wpl); return 0; #else /* L_LITTLE_ENDIAN */ for (j = 0; j < wpl; j++, datas++, datad++) { word = *datas; *datad = (word >> 24) | ((word >> 8) & 0x0000ff00) | ((word << 8) & 0x00ff0000) | (word << 24); } return 0; #endif /* L_BIG_ENDIAN */ } /*! * pixEndianTwoByteSwapNew() * * Input: pixs * Return: 0 if OK, 1 on error * * Notes: * (1) This is used on little-endian platforms to swap the * 2-byte entities within a 32-bit word. * (2) This is equivalent to a full byte swap, as performed * by pixEndianByteSwap(), followed by byte swaps in * each of the 16-bit entities separately. * (3) Unlike pixEndianTwoByteSwap(), which swaps the shorts in-place, * this returns a new pix (or a clone). We provide this * to avoid having to swap twice in situations where the input * pix must be restored to canonical little-endian order. */ PIX * pixEndianTwoByteSwapNew(PIX *pixs) { l_uint32 *datas, *datad; l_int32 i, j, h, wpl; l_uint32 word; PIX *pixd; PROCNAME("pixEndianTwoByteSwapNew"); #ifdef L_BIG_ENDIAN return pixClone(pixs); #else /* L_LITTLE_ENDIAN */ if (!pixs) return (PIX *)ERROR_PTR("pixs not defined", procName, NULL); datas = pixGetData(pixs); wpl = pixGetWpl(pixs); h = pixGetHeight(pixs); pixd = pixCreateTemplate(pixs); datad = pixGetData(pixd); for (i = 0; i < h; i++) { for (j = 0; j < wpl; j++, datas++, datad++) { word = *datas; *datad = (word << 16) | (word >> 16); } } return pixd; #endif /* L_BIG_ENDIAN */ } /*! * pixEndianTwoByteSwap() * * Input: pixs * Return: 0 if OK, 1 on error * * Notes: * (1) This is used on little-endian platforms to swap the * 2-byte entities within a 32-bit word. * (2) This is equivalent to a full byte swap, as performed * by pixEndianByteSwap(), followed by byte swaps in * each of the 16-bit entities separately. */ l_int32 pixEndianTwoByteSwap(PIX *pixs) { l_uint32 *data; l_int32 i, j, h, wpl; l_uint32 word; PROCNAME("pixEndianTwoByteSwap"); #ifdef L_BIG_ENDIAN return 0; #else /* L_LITTLE_ENDIAN */ if (!pixs) return ERROR_INT("pixs not defined", procName, 1); data = pixGetData(pixs); wpl = pixGetWpl(pixs); h = pixGetHeight(pixs); for (i = 0; i < h; i++) { for (j = 0; j < wpl; j++, data++) { word = *data; *data = (word << 16) | (word >> 16); } } return 0; #endif /* L_BIG_ENDIAN */ } /*-------------------------------------------------------------* * Extract raster data as binary string * *-------------------------------------------------------------*/ /*! * pixGetRasterData() * * Input: pixs (1, 8, 32 bpp) * &data ( raster data in memory) * &nbytes ( number of bytes in data string) * Return: 0 if OK, 1 on error * * Notes: * (1) This returns the raster data as a byte string, padded to the * byte. For 1 bpp, the first pixel is the MSbit in the first byte. * For rgb, the bytes are in (rgb) order. This is the format * required for flate encoding of pixels in a PostScript file. */ l_int32 pixGetRasterData(PIX *pixs, l_uint8 **pdata, size_t *pnbytes) { l_int32 w, h, d, wpl, i, j, rval, gval, bval; l_int32 databpl; /* bytes for each raster line in returned data */ l_uint8 *line, *data; /* packed data in returned array */ l_uint32 *rline, *rdata; /* data in pix raster */ PROCNAME("pixGetRasterData"); if (!pdata || !pnbytes) return ERROR_INT("&data and &nbytes not both defined", procName, 1); *pdata = NULL; *pnbytes = 0; if (!pixs) return ERROR_INT("pixs not defined", procName, 1); pixGetDimensions(pixs, &w, &h, &d); if (d != 1 && d != 2 && d != 4 && d != 8 && d != 16 && d != 32) return ERROR_INT("depth not in {1,2,4,8,16,32}", procName, 1); rdata = pixGetData(pixs); wpl = pixGetWpl(pixs); if (d == 1) databpl = (w + 7) / 8; else if (d == 2) databpl = (w + 3) / 4; else if (d == 4) databpl = (w + 1) / 2; else if (d == 8 || d == 16) databpl = w * (d / 8); else /* d == 32 bpp rgb */ databpl = 3 * w; if ((data = (l_uint8 *)CALLOC(databpl * h, sizeof(l_uint8))) == NULL) return ERROR_INT("data not allocated", procName, 1); *pdata = data; *pnbytes = databpl * h; for (i = 0; i < h; i++) { rline = rdata + i * wpl; line = data + i * databpl; if (d <= 8) { for (j = 0; j < databpl; j++) line[j] = GET_DATA_BYTE(rline, j); } else if (d == 16) { for (j = 0; j < w; j++) line[2 * j] = GET_DATA_TWO_BYTES(rline, j); } else { /* d == 32 bpp rgb */ for (j = 0; j < w; j++) { extractRGBValues(rline[j], &rval, &gval, &bval); *(line + 3 * j) = rval; *(line + 3 * j + 1) = gval; *(line + 3 * j + 2) = bval; } } } return 0; } /*-------------------------------------------------------------* * Setup helpers for 8 bpp byte processing * *-------------------------------------------------------------*/ /*! * pixSetupByteProcessing() * * Input: pix (8 bpp, no colormap) * &w ( width) * &h ( height) * Return: line ptr array, or null on error * * Notes: * (1) This is a simple helper for processing 8 bpp images with * direct byte access. It can swap byte order within each word. * (2) After processing, you must call pixCleanupByteProcessing(), * which frees the lineptr array and restores byte order. * (3) Usage: * l_uint8 **lineptrs = pixSetupByteProcessing(pix, &w, &h); * for (i = 0; i < h; i++) { * l_uint8 *line = lineptrs[i]; * for (j = 0; j < w; j++) { * val = line[j]; * ... * } * } * pixCleanupByteProcessing(pix, lineptrs); */ l_uint8 ** pixSetupByteProcessing(PIX *pix, l_int32 *pw, l_int32 *ph) { l_int32 w, h; PROCNAME("pixSetupByteProcessing"); if (pw) *pw = 0; if (ph) *ph = 0; if (!pix || pixGetDepth(pix) != 8) return (l_uint8 **)ERROR_PTR("pix not defined or not 8 bpp", procName, NULL); if (pixGetColormap(pix)) return (l_uint8 **)ERROR_PTR("pix has colormap", procName, NULL); pixGetDimensions(pix, &w, &h, NULL); if (pw) *pw = w; if (ph) *ph = h; pixEndianByteSwap(pix); return (l_uint8 **)pixGetLinePtrs(pix, NULL); } /*! * pixCleanupByteProcessing() * * Input: pix (8 bpp, no colormap) * lineptrs (ptrs to the beginning of each raster line of data) * Return: 0 if OK, 1 on error * * Notes: * (1) This must be called after processing that was initiated * by pixSetupByteProcessing() has finished. */ l_int32 pixCleanupByteProcessing(PIX *pix, l_uint8 **lineptrs) { PROCNAME("pixCleanupByteProcessing"); if (!pix) return ERROR_INT("pix not defined", procName, 1); if (!lineptrs) return ERROR_INT("lineptrs not defined", procName, 1); pixEndianByteSwap(pix); FREE(lineptrs); return 0; } /*------------------------------------------------------------------------* * Setting parameters for antialias masking with alpha transforms * *------------------------------------------------------------------------*/ /*! * l_setAlphaMaskBorder() * * Input: val1, val2 (in [0.0 ... 1.0]) * Return: void * * Notes: * (1) This sets the opacity values used to generate the two outer * boundary rings in the alpha mask associated with geometric * transforms such as pixRotateWithAlpha(). * (2) The default values are val1 = 0.0 (completely transparent * in the outermost ring) and val2 = 0.5 (half transparent * in the second ring). When the image is blended, this * completely removes the outer ring (shrinking the image by * 2 in each direction), and alpha-blends with 0.5 the second ring. * (3) The actual mask values are found by multiplying these * normalized opacity values by 255. */ void l_setAlphaMaskBorder(l_float32 val1, l_float32 val2) { val1 = L_MAX(0.0, L_MIN(1.0, val1)); val2 = L_MAX(0.0, L_MIN(1.0, val2)); AlphaMaskBorderVals[0] = val1; AlphaMaskBorderVals[1] = val2; }