53 lines
1.3 KiB
C++
53 lines
1.3 KiB
C++
#include "memory.h"
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#include <cstdlib>
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#include <cstring>
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#include <cassert>
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char* memory2dRealloc(char* data, int datasize, int oldxsize, int oldysize, int newxsize, int newysize, int xoffset, int yoffset)
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{
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int xstart, xend, xlen;
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int ystart, yend, y;
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char* result = (char*)malloc(datasize * newxsize * newysize);
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/* Move remaining part*/
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ystart = yoffset;
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yend = yoffset + oldysize;
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if (yend >= 0 && ystart < newysize)
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{
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if (ystart < 0)
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{
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ystart = 0;
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}
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if (yend > newysize - 1)
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{
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yend = newysize - 1;
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}
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xstart = xoffset;
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xend = xoffset + oldxsize;
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if (xend >= 0 && xstart < newxsize)
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{
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if (xstart < 0)
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{
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xstart = 0;
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}
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if (xend > newxsize - 1)
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{
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xend = newxsize - 1;
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}
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xlen = xend - xstart + 1;
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if (xlen > 0)
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{
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for (y = ystart; y <= yend; y++)
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{
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memcpy(result + (y * newxsize + xstart) * datasize, data + ((y - ystart) * oldxsize) * datasize, xlen * datasize);
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}
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}
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}
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}
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free(data);
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return result;
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}
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