third-party/leptonica/prog/blendcmaptest.c
/*====================================================================*
- 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.
*====================================================================*/
/*
* blendcmaptest.c
*
*/
#include "allheaders.h"
#define NX 4
#define NY 5
#define FADE_FRACTION 0.75
int main(int argc,
char **argv)
{
l_int32 i, j, sindex, wb, hb, ws, hs, delx, dely, x, y, y0;
PIX *pixs, *pixb, *pixt0, *pixt1;
PIXCMAP *cmap;
pixs = pixRead("rabi.png");
pixb = pixRead("weasel4.11c.png");
pixDisplayWrite(NULL, -1);
/* Fade the blender */
pixcmapShiftIntensity(pixGetColormap(pixb), FADE_FRACTION);
/* Downscale the input */
wb = pixGetWidth(pixb);
hb = pixGetHeight(pixb);
pixt0 = pixScaleToGray4(pixs);
/* Threshold to 5 levels, 4 bpp */
ws = pixGetWidth(pixt0);
hs = pixGetHeight(pixt0);
pixt1 = pixThresholdTo4bpp(pixt0, 5, 1);
pixDisplayWriteFormat(pixt1, 1, IFF_PNG);
pixDisplayWrite(pixb, 1);
cmap = pixGetColormap(pixt1);
pixcmapWriteStream(stderr, cmap);
/* Overwrite the white pixels (at sindex in pixt1) */
pixcmapGetIndex(cmap, 255, 255, 255, &sindex);
delx = ws / NX;
dely = hs / NY;
for (i = 0; i < NY; i++) {
y = 20 + i * dely;
if (y >= hs + hb)
continue;
for (j = 0; j < NX; j++) {
x = 30 + j * delx;
y0 = y;
if (j & 1) {
y0 = y + dely / 2;
if (y0 >= hs + hb)
continue;
}
if (x >= ws + wb)
continue;
pixBlendCmap(pixt1, pixb, x, y0, sindex);
}
}
pixDisplayWriteFormat(pixt1, 1, IFF_PNG);
cmap = pixGetColormap(pixt1);
pixcmapWriteStream(stderr, cmap);
pixDisplayMultiple("/tmp/display/file*");
pixDestroy(&pixs);
pixDestroy(&pixb);
pixDestroy(&pixt0);
pixDestroy(&pixt1);
return 0;
}