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greg |
2.1 |
/* |
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* abitmap.cpp |
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* panlib |
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* |
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* General bitmap class implementation |
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* |
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* Created by gward on Wed Oct 31 2001. |
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* Copyright (c) 2022 Anyhere Software. All rights reserved. |
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* |
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*/ |
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#include <string.h> |
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#include <math.h> |
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#include "abitmap.h" |
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// Private workhorse bit copy function; handles overlaps but no length checks |
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static void |
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moveBits(uint32 *bdst, uint32 idst, const uint32 *bsrc, uint32 isrc, uint32 n) |
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{ |
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if (!n) |
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return; |
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bdst += idst >> 5; idst &= 0x1f; |
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bsrc += isrc >> 5; isrc &= 0x1f; |
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if ((bdst == bsrc) & (idst == isrc)) |
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return; |
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uint32 sword[2]; |
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if (n <= 32) { // short string case |
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sword[0] = bsrc[0]; |
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sword[1] = bsrc[isrc+n > 32]; |
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bsrc = sword; |
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while (n--) { |
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*bdst &= ~(1 << idst); |
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*bdst |= ((*bsrc >> isrc) & 1) << idst; |
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if (++idst > 0x1f) { idst=0; ++bdst; } |
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if (++isrc > 0x1f) { isrc=0; ++bsrc; } |
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} |
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return; |
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} |
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const bool reverse = (bdst==bsrc) ? (idst > isrc) : (bdst > bsrc); |
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const int boff = isrc-idst & 0x1f; |
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const bool woff = (isrc > idst); |
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const bool partstart = (idst != 0); |
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const bool partend = ((idst+n & 0x1f) != 0); |
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const int lastword = (idst+n) >> 5; |
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uint32 mask; |
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// messy starting-word stuff |
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#define DO_FIRSTPART if (partstart) { \ |
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sword[0] = bsrc[0]; sword[1] = bsrc[1]; \ |
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bdst[0] &= mask = (1<<idst)-1; \ |
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if (boff) { \ |
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bdst[0] |= sword[woff]<<(32-boff) & ~mask; \ |
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if (woff) bdst[0] |= sword[0]>>boff & ~mask; \ |
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} else \ |
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bdst[0] |= sword[0] & ~mask; \ |
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} else |
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// messy ending-word stuff |
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#define DO_LASTPART if (partend) { \ |
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mask = ~0 << (idst+n & 0x1f); \ |
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bool beyond = (1<<(32-boff) & ~mask); \ |
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sword[0] = bsrc[lastword-1]; \ |
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if (!boff | woff | beyond) sword[1] = bsrc[lastword]; \ |
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bdst[lastword] &= mask; \ |
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if (boff) { \ |
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bdst[lastword] |= (sword[woff]>>boff) & ~mask; \ |
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if (beyond) \ |
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bdst[lastword] |= (woff ? bsrc[lastword+1] : sword[1]) \ |
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<< (32-boff) & ~mask; \ |
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} else \ |
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bdst[lastword] |= sword[1] & ~mask; \ |
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} else |
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if (reverse) |
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DO_LASTPART; |
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else |
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DO_FIRSTPART; |
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if (boff) { // middle part (unaligned case) |
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int i; |
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if (reverse) { |
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for (i = lastword; --i > 0; ) |
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bdst[i] = bsrc[i+woff]<<(32-boff) | bsrc[i+woff-1]>>boff; |
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if (!partstart) { |
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bdst[0] = bsrc[woff]<<(32-boff); |
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if (woff) bdst[0] |= bsrc[0]>>boff; |
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} |
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} else { |
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if (!partstart) { |
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bdst[0] = bsrc[woff]<<(32-boff); |
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if (woff) bdst[0] |= bsrc[0]>>boff; |
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} |
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for (i = 0; ++i < lastword; ) |
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bdst[i] = bsrc[i+woff]<<(32-boff) | bsrc[i+woff-1]>>boff; |
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} |
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} else { // middle (aligned word case) |
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memmove(bdst+partstart, bsrc+partstart, |
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(lastword-partstart)*sizeof(uint32)); |
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} |
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if (reverse) |
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DO_FIRSTPART; |
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else |
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DO_LASTPART; |
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#undef DO_FIRSTPART |
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#undef DO_LASTPART |
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} |
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// Create and clear a new bitmap |
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bool |
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ABitMap::NewBitMap(uint32 n, bool clrset) |
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{ |
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int32 onwords = bmlen(); |
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len = n; |
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int32 nwords = bmlen(); |
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if (nwords != onwords) { |
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delete [] bmap; |
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if (nwords) bmap = new uint32 [nwords]; |
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else bmap = 0; |
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} |
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if (!nwords) |
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return false; |
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ClearBitMap(clrset); |
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return true; |
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} |
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// Clear bitmap to given value |
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void |
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ABitMap::ClearBitMap(bool clrset) |
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{ |
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memset(bmap, clrset * 0xff, sizeof(uint32)*bmlen()); |
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} |
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// Invert the entire bitmap |
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void |
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ABitMap::Invert() |
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{ |
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uint32 * wp = bmap + bmlen(); |
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while (wp-- > bmap) |
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*wp = ~*wp; |
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} |
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// Extract bitmap section |
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bool |
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ABitMap::GetBits(ABitMap *dp, uint32 i) const |
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{ |
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if (!dp | (dp == this)) |
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return false; |
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if (i >= len) |
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return false; |
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if (!dp->len && !dp->NewBitMap(len-i)) |
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return false; |
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if (!i & (dp->len == len)) { |
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*dp = *this; |
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return true; |
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} |
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uint32 n = dp->len; |
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if (n > len-i) |
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n = len-i; |
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moveBits(dp->bmap, 0, bmap, i, n); |
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return true; |
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} |
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// Overlay bitmap section (ignores bits past end) |
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bool |
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ABitMap::AssignBits(uint32 i, const ABitMap &src) |
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{ |
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if (!src.len) |
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return true; |
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if (!i & (src.len == len)) { |
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*this = src; |
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return true; |
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} |
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if (i >= len) |
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return false; |
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moveBits(bmap, i, src.bmap, 0, (len-i < src.len) ? len-i : src.len); |
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return true; |
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} |
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// Apply operation to bitmap section |
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bool |
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ABitMap::OpBits(uint32 i, char op, const ABitMap &src) |
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{ |
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if (!src.len | !len) |
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return false; |
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if (op == '=') |
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return AssignBits(i, src); |
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ABitMap bits(src.len); |
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if (!GetBits(&bits, i)) |
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return false; |
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switch (op) { |
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case '|': |
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bits |= src; |
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break; |
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case '&': |
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bits &= src; |
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break; |
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case '^': |
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bits ^= src; |
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break; |
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case '-': |
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case '>': |
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bits -= src; |
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break; |
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case '<': |
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bits.Invert(); |
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bits &= src; |
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break; |
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default: |
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return false; |
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} |
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return AssignBits(i, bits); |
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} |
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// Clear bitmap section |
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void |
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ABitMap::ClearBits(uint32 i, uint32 n, bool clrset) |
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{ |
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if (i >= len) |
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return; |
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if (n >= len - i) { |
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if (!i) { |
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ClearBitMap(clrset); |
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return; |
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} |
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n = len - i; |
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} else if (!n) |
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return; |
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const uint32 * const sectEnd = bmap + ((i+n)>>5); |
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uint32 * wp = bmap + (i>>5); |
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if (wp == sectEnd) { // single word clear? |
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const uint32 bits = (~0 << (i & 0x1f) & |
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(1 << (i+n & 0x1f)) - 1); |
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if (clrset) |
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*wp |= bits; |
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else |
| 233 |
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*wp &= ~bits; |
| 234 |
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return; |
| 235 |
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} |
| 236 |
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const uint32 clrWord = clrset * ~0; |
| 237 |
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if (i & 0x1f) { // partial first word? |
| 238 |
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if (clrset) |
| 239 |
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*wp++ |= ~0 << (i & 0x1f); |
| 240 |
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else |
| 241 |
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*wp++ &= (1 << (i & 0x1f)) - 1; |
| 242 |
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} |
| 243 |
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while (wp < sectEnd) // central words |
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*wp++ = clrWord; |
| 245 |
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if (i+n & 0x1f) { // partial last word? |
| 246 |
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if (clrset) |
| 247 |
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*wp |= (1 << (i+n & 0x1f)) - 1; |
| 248 |
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else |
| 249 |
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*wp &= ~0 << (i+n & 0x1f); |
| 250 |
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} |
| 251 |
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} |
| 252 |
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| 253 |
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// Total all bits set in bitmap |
| 254 |
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uint32 |
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ABitMap::SumTotal(bool bit2cnt) const |
| 256 |
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{ |
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static char bitCount[256]; |
| 258 |
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int i; |
| 259 |
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if (!bitCount[255]) { |
| 260 |
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for (i = 256; --i; ) |
| 261 |
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for (int bits = i; bits; bits >>= 1) |
| 262 |
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bitCount[i] += (bits & 1); |
| 263 |
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} |
| 264 |
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uint32 count = 0; |
| 265 |
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const unsigned char * cp; |
| 266 |
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cp = (const unsigned char *)(bmap + bmlen()); |
| 267 |
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if (len & 0x1f) { // partial last word |
| 268 |
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uint32 lastBits = WordV(len-1); |
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lastBits &= (1<<(len&0x1f)) - 1; |
| 270 |
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for (i = sizeof(uint32); i--; lastBits >>= 8) |
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count += bitCount[lastBits & 0xff]; |
| 272 |
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cp -= sizeof(uint32); |
| 273 |
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} |
| 274 |
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while (cp > (const unsigned char *)bmap) |
| 275 |
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count += bitCount[*--cp]; |
| 276 |
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if (bit2cnt) |
| 277 |
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return count; |
| 278 |
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return len - count; |
| 279 |
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} |
| 280 |
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| 281 |
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// Return the next bit position matching val (or ABMend if no match) |
| 282 |
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uint32 |
| 283 |
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ABitMap::Find(uint32 i, bool val) const |
| 284 |
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{ |
| 285 |
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const uint32 clrWord = !val * ~0; |
| 286 |
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const uint32 * wp = bmap + (i>>5); |
| 287 |
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uint32 b = Bit(i); |
| 288 |
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| 289 |
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wp -= !(i & 0x1f); |
| 290 |
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| 291 |
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while (i < len) { |
| 292 |
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if (!(i & 0x1f)) { |
| 293 |
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while (*++wp == clrWord) |
| 294 |
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if ((i += 0x20) >= len) |
| 295 |
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return ABMend; |
| 296 |
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b = 1; |
| 297 |
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} |
| 298 |
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if (((*wp & b) != 0) == val) |
| 299 |
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return i; |
| 300 |
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b <<= 1; |
| 301 |
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++i; |
| 302 |
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} |
| 303 |
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return ABMend; |
| 304 |
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} |
| 305 |
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| 306 |
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// Shift bits downward in bitmap, zero fill |
| 307 |
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ABitMap & |
| 308 |
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ABitMap::operator>>=(uint32 nbits) |
| 309 |
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{ |
| 310 |
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if (!nbits) |
| 311 |
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return *this; |
| 312 |
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if (nbits >= len) { |
| 313 |
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ClearBitMap(); |
| 314 |
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return *this; |
| 315 |
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} |
| 316 |
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moveBits(bmap, 0, bmap, nbits, len-nbits); |
| 317 |
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ClearBits(len-nbits, nbits); |
| 318 |
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return *this; |
| 319 |
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} |
| 320 |
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| 321 |
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// Shift bits upwards in bitmap, zero fill |
| 322 |
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ABitMap & |
| 323 |
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ABitMap::operator<<=(uint32 nbits) |
| 324 |
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{ |
| 325 |
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if (!nbits) |
| 326 |
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return *this; |
| 327 |
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if (nbits >= len) { |
| 328 |
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ClearBitMap(); |
| 329 |
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return *this; |
| 330 |
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} |
| 331 |
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moveBits(bmap, nbits, bmap, 0, len-nbits); |
| 332 |
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ClearBits(0, nbits); |
| 333 |
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return *this; |
| 334 |
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} |
| 335 |
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| 336 |
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// Bitmap copy operator |
| 337 |
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ABitMap & |
| 338 |
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ABitMap::operator=(const ABitMap &src) |
| 339 |
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{ |
| 340 |
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if (this == &src) |
| 341 |
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return *this; |
| 342 |
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int32 nwords = src.bmlen(); |
| 343 |
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if (nwords != bmlen()) { |
| 344 |
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delete [] bmap; |
| 345 |
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if (nwords) bmap = new uint32 [nwords]; |
| 346 |
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else bmap = 0; |
| 347 |
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} |
| 348 |
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len = src.len; |
| 349 |
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memcpy(bmap, src.bmap, nwords*sizeof(uint32)); |
| 350 |
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return *this; |
| 351 |
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} |
| 352 |
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|
| 353 |
|
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// Bitmap OR-copy operator (reverts to copy for different size bitmaps) |
| 354 |
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ABitMap & |
| 355 |
|
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ABitMap::operator|=(const ABitMap &src) |
| 356 |
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{ |
| 357 |
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if (this == &src) |
| 358 |
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return *this; |
| 359 |
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if (len != src.len) |
| 360 |
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return *this = src; |
| 361 |
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const int32 nwords = bmlen(); |
| 362 |
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const uint32 * owp = src.bmap + nwords; |
| 363 |
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uint32 * wp = bmap + nwords; |
| 364 |
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while (wp > bmap) |
| 365 |
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*--wp |= *--owp; |
| 366 |
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return *this; |
| 367 |
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} |
| 368 |
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|
| 369 |
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// Bitmap AND-assign operator (no effect for different size bitmaps) |
| 370 |
|
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ABitMap & |
| 371 |
|
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ABitMap::operator&=(const ABitMap &src) |
| 372 |
|
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{ |
| 373 |
|
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if (this == &src) |
| 374 |
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return *this; |
| 375 |
|
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if (len != src.len) |
| 376 |
|
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return *this; |
| 377 |
|
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const int32 nwords = bmlen(); |
| 378 |
|
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const uint32 * owp = src.bmap + nwords; |
| 379 |
|
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uint32 * wp = bmap + nwords; |
| 380 |
|
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while (wp > bmap) |
| 381 |
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*--wp &= *--owp; |
| 382 |
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return *this; |
| 383 |
|
|
} |
| 384 |
|
|
|
| 385 |
|
|
// Bitmap XOR-assign operator (no effect for different size bitmaps) |
| 386 |
|
|
ABitMap & |
| 387 |
|
|
ABitMap::operator^=(const ABitMap &src) |
| 388 |
|
|
{ |
| 389 |
|
|
if (this == &src) { |
| 390 |
|
|
ClearBitMap(); |
| 391 |
|
|
return *this; |
| 392 |
|
|
} |
| 393 |
|
|
if (len != src.len) |
| 394 |
|
|
return *this; |
| 395 |
|
|
const int32 nwords = bmlen(); |
| 396 |
|
|
const uint32 * owp = src.bmap + nwords; |
| 397 |
|
|
uint32 * wp = bmap + nwords; |
| 398 |
|
|
while (wp > bmap) |
| 399 |
|
|
*--wp ^= *--owp; |
| 400 |
|
|
return *this; |
| 401 |
|
|
} |
| 402 |
|
|
|
| 403 |
|
|
// Clear bits set in second bitmap |
| 404 |
|
|
bool |
| 405 |
|
|
ABitMap::ClearBitsFrom(const ABitMap &src) |
| 406 |
|
|
{ |
| 407 |
|
|
if (this == &src) { |
| 408 |
|
|
ClearBitMap(); |
| 409 |
|
|
return true; |
| 410 |
|
|
} |
| 411 |
|
|
if (src.len != len) |
| 412 |
|
|
return false; |
| 413 |
|
|
uint32 * wp = bmap + bmlen(); |
| 414 |
|
|
const uint32 * sp = src.bmap + src.bmlen(); |
| 415 |
|
|
while (wp > bmap) |
| 416 |
|
|
*--wp &= ~*--sp; |
| 417 |
|
|
return true; |
| 418 |
|
|
} |
| 419 |
|
|
|
| 420 |
|
|
// Compare two bitmaps for equality |
| 421 |
|
|
bool |
| 422 |
|
|
ABitMap::operator==(const ABitMap &that) const |
| 423 |
|
|
{ |
| 424 |
|
|
if (this == &that) |
| 425 |
|
|
return true; |
| 426 |
|
|
if (len != that.len) |
| 427 |
|
|
return false; |
| 428 |
|
|
if (!len) |
| 429 |
|
|
return true; |
| 430 |
|
|
const int nwords = len >> 5; |
| 431 |
|
|
const uint32 * owp = that.bmap + nwords; |
| 432 |
|
|
const uint32 * wp = bmap + nwords; |
| 433 |
|
|
if (len & 0x1f && (*--wp ^ *--owp) & (1<<(len&0x1f))-1) |
| 434 |
|
|
return false; |
| 435 |
|
|
while (wp > bmap) |
| 436 |
|
|
if (*--wp != *--owp) |
| 437 |
|
|
return false; |
| 438 |
|
|
return true; |
| 439 |
|
|
} |
| 440 |
|
|
|
| 441 |
|
|
/*************** Run-length compander section *************** |
| 442 |
|
|
* First bit is: |
| 443 |
|
|
* 0 => non-run |
| 444 |
|
|
* 1 => run |
| 445 |
|
|
* Next N "0" bits indicate counter length-3, "1"-terminated: |
| 446 |
|
|
* 001 => e.g., 5-bit counter follows |
| 447 |
|
|
* Next N+3 bits constitute counter M, with implied "1" in leftmost bit |
| 448 |
|
|
* 00001 => e.g., 33 run or non-run length |
| 449 |
|
|
* Next bit is "0" for a run of M 0's, or "1" for a run of 1's, |
| 450 |
|
|
* OR M bits of non-run data. |
| 451 |
|
|
* |
| 452 |
|
|
* Example 1: "00101101" => "0 1 000 00101101" |
| 453 |
|
|
* Example 2: 49 1's => "1 001 10001 1" |
| 454 |
|
|
* Example 3: 7326 0's => "1 0000000001 110010011110 0" |
| 455 |
|
|
* |
| 456 |
|
|
* Note that any run or non-run must span 8 bits or more in source, and |
| 457 |
|
|
* will take up at least 6 encoded bits for a run and 13 for a non-run. |
| 458 |
|
|
* Encoding a bitmap < 72 bits long is never a win, and < 8 is |
| 459 |
|
|
* not possible. A bitmap <= 64 bits in length will be passed as is. |
| 460 |
|
|
* Decoding is trivial compared to logical constraints during encode. |
| 461 |
|
|
*/ |
| 462 |
|
|
|
| 463 |
|
|
#define RLEmagic 0x1700A9A5 // magic number (32-bits) |
| 464 |
|
|
#define MinCntB 3 // minimum counter length |
| 465 |
|
|
#define MinCnt (1<<MinCntB) // minimum encodable bit sequence |
| 466 |
|
|
|
| 467 |
|
|
// Get original bitmap length if RLE (or 0) |
| 468 |
|
|
uint32 |
| 469 |
|
|
ABitMap::RLength() const |
| 470 |
|
|
{ |
| 471 |
|
|
if (bmlen() < 3 || bmap[0] != RLEmagic) return 0; |
| 472 |
|
|
return bmap[1]; |
| 473 |
|
|
} |
| 474 |
|
|
|
| 475 |
|
|
// Compress into a run-length encoded bitmap |
| 476 |
|
|
bool |
| 477 |
|
|
ABitMap::GetRLE(ABitMap *rlep) const |
| 478 |
|
|
{ |
| 479 |
|
|
if (!rlep) |
| 480 |
|
|
return false; |
| 481 |
|
|
if (RLength()) // already encoded? |
| 482 |
|
|
return false; |
| 483 |
|
|
if (len <= 64) { // don't bother? |
| 484 |
|
|
*rlep = *this; |
| 485 |
|
|
return len; |
| 486 |
|
|
} |
| 487 |
|
|
// create draft bitmap |
| 488 |
|
|
ABitMap tmap(len + len/50 + 128); |
| 489 |
|
|
tmap.bmap[0] = RLEmagic; // mark as RLE |
| 490 |
|
|
tmap.bmap[1] = len; // record original length |
| 491 |
|
|
uint32 i=0, o=64; // encode bits |
| 492 |
|
|
while (i < len) { |
| 493 |
|
|
uint32 cnt, cbex; |
| 494 |
|
|
uint32 start = i++; // check for usable run |
| 495 |
|
|
if (!Find(&i, !Check(start))) |
| 496 |
|
|
i = len; |
| 497 |
|
|
else if (i > len - MinCnt) |
| 498 |
|
|
i = len - MinCnt; |
| 499 |
|
|
|
| 500 |
|
|
if (i >= start + MinCnt) { |
| 501 |
|
|
tmap.Set(o++); // encode a run |
| 502 |
|
|
cnt = (i - start)>>MinCntB; |
| 503 |
|
|
cbex = MinCntB; // counter width |
| 504 |
|
|
while (cnt > 1) { |
| 505 |
|
|
o++; |
| 506 |
|
|
cbex++; |
| 507 |
|
|
cnt >>= 1; |
| 508 |
|
|
} |
| 509 |
|
|
tmap.Set(o++); // 1 terminator, then count |
| 510 |
|
|
cnt = i - start; |
| 511 |
|
|
while (cbex-- > 0) { |
| 512 |
|
|
if (cnt & 1<<cbex) tmap.Set(o); |
| 513 |
|
|
++o; |
| 514 |
|
|
} // followed by repeat bit |
| 515 |
|
|
if (Check(start)) |
| 516 |
|
|
tmap.Set(o); |
| 517 |
|
|
++o; |
| 518 |
|
|
continue; // move on to next |
| 519 |
|
|
} |
| 520 |
|
|
i = start + MinCnt; // else encode non-run |
| 521 |
|
|
if (i + MinCnt > len) |
| 522 |
|
|
i = len; // non-run to end |
| 523 |
|
|
while (i < len) { // stop at next useful run |
| 524 |
|
|
bool cand = Check(i); |
| 525 |
|
|
uint32 candStart = i; |
| 526 |
|
|
while (++i < len && Check(i) == cand) |
| 527 |
|
|
if (i - candStart > 2*(2+MinCntB)+1) { |
| 528 |
|
|
i = candStart; |
| 529 |
|
|
candStart = ABMend; |
| 530 |
|
|
break; |
| 531 |
|
|
} |
| 532 |
|
|
if (candStart == ABMend) |
| 533 |
|
|
break; // found run worth stopping for |
| 534 |
|
|
} |
| 535 |
|
|
o++; // encode our non-run |
| 536 |
|
|
cnt = (i - start)>>MinCntB; |
| 537 |
|
|
if (!cnt) |
| 538 |
|
|
goto calamity; // should never occur! |
| 539 |
|
|
cbex = MinCntB; // counter width |
| 540 |
|
|
while (cnt > 1) { |
| 541 |
|
|
o++; |
| 542 |
|
|
cbex++; |
| 543 |
|
|
cnt >>= 1; |
| 544 |
|
|
} |
| 545 |
|
|
tmap.Set(o++); // 1 terminator, then count |
| 546 |
|
|
cnt = i - start; |
| 547 |
|
|
while (cbex-- > 0) { |
| 548 |
|
|
if (cnt & 1<<cbex) tmap.Set(o); |
| 549 |
|
|
++o; |
| 550 |
|
|
} // finally, copy bit data |
| 551 |
|
|
if (o + cnt > tmap.len) |
| 552 |
|
|
goto calamity; // over-ran temp buffer! |
| 553 |
|
|
moveBits(tmap.bmap, o, bmap, start, cnt); |
| 554 |
|
|
o += cnt; // onwards... |
| 555 |
|
|
} |
| 556 |
|
|
// copy to right-sized array |
| 557 |
|
|
if (rlep->NewBitMap(o) && tmap.GetBits(rlep, 0)) |
| 558 |
|
|
return true; |
| 559 |
|
|
calamity: // XXX should really speak up if we get here! |
| 560 |
|
|
return false; |
| 561 |
|
|
} |
| 562 |
|
|
|
| 563 |
|
|
// Reconstitute bits from RLE encoding |
| 564 |
|
|
bool |
| 565 |
|
|
ABitMap::SetFromRLE(const ABitMap &rle) |
| 566 |
|
|
{ |
| 567 |
|
|
if (rle.len <= 64) { // never was encoded? |
| 568 |
|
|
*this = rle; |
| 569 |
|
|
return len; |
| 570 |
|
|
} |
| 571 |
|
|
if (&rle == this) { // cuidado! |
| 572 |
|
|
ABitMap tmap; |
| 573 |
|
|
return tmap.Take(this) && SetFromRLE(tmap); |
| 574 |
|
|
} |
| 575 |
|
|
if (!NewBitMap(rle.RLength())) // start from 0's |
| 576 |
|
|
return false; |
| 577 |
|
|
uint32 i=64, o=0; // decode bits |
| 578 |
|
|
while (i < rle.len) { |
| 579 |
|
|
bool isrun = rle.Check(i++); |
| 580 |
|
|
int cntlen = MinCntB; |
| 581 |
|
|
while (!rle.Check(i++)) cntlen++; |
| 582 |
|
|
if (cntlen > 31) |
| 583 |
|
|
return false; |
| 584 |
|
|
uint32 rlen = 1; // get output count |
| 585 |
|
|
while (cntlen--) |
| 586 |
|
|
rlen = (rlen<<1) + rle.Check(i++); |
| 587 |
|
|
if (!isrun) { // copy bits |
| 588 |
|
|
if ((i+rlen > rle.len) | (o+rlen > len)) |
| 589 |
|
|
return false; |
| 590 |
|
|
moveBits(bmap, o, rle.bmap, i, rlen); |
| 591 |
|
|
i += rlen; |
| 592 |
|
|
} else if (rle.Check(i++)) |
| 593 |
|
|
ClearBits(o, rlen, true); |
| 594 |
|
|
|
| 595 |
|
|
if ((o += rlen) >= len) // advance output index |
| 596 |
|
|
break; |
| 597 |
|
|
} |
| 598 |
|
|
return (i == rle.len) & (o == len); |
| 599 |
|
|
} |
| 600 |
|
|
|
| 601 |
|
|
/*************** 2-D bitmap section ***************/ |
| 602 |
|
|
|
| 603 |
|
|
// Reconstitute bits from RLE encoding (size must match) |
| 604 |
|
|
bool |
| 605 |
|
|
ABitMap2::SetFromRLE(int w, int h, const ABitMap &rle) |
| 606 |
|
|
{ |
| 607 |
|
|
uint32 orig_len = rle.RLength(); |
| 608 |
|
|
|
| 609 |
|
|
if ((w <= 0) | (h <= 0) | (orig_len != (uint32)w*h)) |
| 610 |
|
|
return false; |
| 611 |
|
|
|
| 612 |
|
|
if (!ABitMap::SetFromRLE(rle)) |
| 613 |
|
|
return false; |
| 614 |
|
|
|
| 615 |
|
|
width = w; height = h; |
| 616 |
|
|
return true; |
| 617 |
|
|
} |
| 618 |
|
|
|
| 619 |
|
|
// Extract bitmap section, true if some overlap |
| 620 |
|
|
bool |
| 621 |
|
|
ABitMap2::GetRect(ABitMap2 *dp, int sx, int sy) const |
| 622 |
|
|
{ |
| 623 |
|
|
if (!dp | (dp == this)) |
| 624 |
|
|
return false; |
| 625 |
|
|
if ((sx >= width) | (sy >= height)) |
| 626 |
|
|
return false; |
| 627 |
|
|
if (dp->width <= 0 && !dp->NewBitMap(width-sx, height-sy)) |
| 628 |
|
|
return false; |
| 629 |
|
|
if (!sx & !sy & (dp->width == width) & (dp->height == height)) { |
| 630 |
|
|
*dp = *this; |
| 631 |
|
|
return true; |
| 632 |
|
|
} |
| 633 |
|
|
int dx=0, dy=0; |
| 634 |
|
|
if (sx < 0) { |
| 635 |
|
|
if ((dx = -sx) >= dp->width) return false; |
| 636 |
|
|
sx = 0; |
| 637 |
|
|
} |
| 638 |
|
|
if (sy < 0) { |
| 639 |
|
|
if ((dy = -sy) >= dp->height) return false; |
| 640 |
|
|
sy = 0; |
| 641 |
|
|
} |
| 642 |
|
|
const int rowwidth = (dp->width-dx > width-sx) ? width-sx : dp->width-dx; |
| 643 |
|
|
int rowcount = (dp->height-dy > height-sy) ? height-sy : dp->height-dy; |
| 644 |
|
|
if ((rowwidth == width) & (width == dp->width)) |
| 645 |
|
|
moveBits(dp->base(), dp->width*dy, base(), width*sy, rowwidth*rowcount); |
| 646 |
|
|
else |
| 647 |
|
|
while (rowcount--) |
| 648 |
|
|
moveBits(dp->base(), dp->width*dy++ + dx, |
| 649 |
|
|
base(), width*sy++ + sx, rowwidth); |
| 650 |
|
|
return true; |
| 651 |
|
|
} |
| 652 |
|
|
|
| 653 |
|
|
// Assign bitmap section (ignores anything past edges) |
| 654 |
|
|
bool |
| 655 |
|
|
ABitMap2::AssignRect(int dx, int dy, const ABitMap2 &src) |
| 656 |
|
|
{ |
| 657 |
|
|
if (src.width <= 0) |
| 658 |
|
|
return true; |
| 659 |
|
|
if ((dx >= width) | (dy >= height)) |
| 660 |
|
|
return false; |
| 661 |
|
|
if (!dx & !dy && (src.width == width) & (src.height == height)) { |
| 662 |
|
|
*this = src; |
| 663 |
|
|
return true; |
| 664 |
|
|
} |
| 665 |
|
|
int sx=0, sy=0; |
| 666 |
|
|
int w=src.width, h=src.height; |
| 667 |
|
|
if (dx < 0) { |
| 668 |
|
|
if ((sx = -dx) >= w) return false; |
| 669 |
|
|
dx = 0; w -= sx; |
| 670 |
|
|
} |
| 671 |
|
|
if (dy < 0) { |
| 672 |
|
|
if ((sy = -dy) >= h) return false; |
| 673 |
|
|
dy = 0; h -= sy; |
| 674 |
|
|
} |
| 675 |
|
|
if (dx+w > width) w = width - dx; |
| 676 |
|
|
if (dy+h > height) h = height - dy; |
| 677 |
|
|
if ((w <= 0) | (h <= 0)) |
| 678 |
|
|
return false; |
| 679 |
|
|
if ((w == width) & (width == src.width)) |
| 680 |
|
|
moveBits(base(), width*dy, src.base(), src.width*sy, w*h); |
| 681 |
|
|
else |
| 682 |
|
|
while (h--) |
| 683 |
|
|
moveBits(base(), width*dy++ + dx, |
| 684 |
|
|
src.base(), src.width*sy++ + sx, w); |
| 685 |
|
|
return true; |
| 686 |
|
|
} |
| 687 |
|
|
|
| 688 |
|
|
// Apply operation to bitmap section |
| 689 |
|
|
bool |
| 690 |
|
|
ABitMap2::OpRect(int dx, int dy, char op, const ABitMap2 &src) |
| 691 |
|
|
{ |
| 692 |
|
|
if ((src.width <= 0) | (width <= 0)) |
| 693 |
|
|
return false; |
| 694 |
|
|
if (op == '=') |
| 695 |
|
|
return AssignRect(dx, dy, src); |
| 696 |
|
|
ABitMap2 rbits(src.width, src.height); |
| 697 |
|
|
if (!GetRect(&rbits, dx, dy)) |
| 698 |
|
|
return false; |
| 699 |
|
|
switch (op) { |
| 700 |
|
|
case '|': |
| 701 |
|
|
rbits |= src; |
| 702 |
|
|
break; |
| 703 |
|
|
case '&': |
| 704 |
|
|
rbits &= src; |
| 705 |
|
|
break; |
| 706 |
|
|
case '^': |
| 707 |
|
|
rbits ^= src; |
| 708 |
|
|
break; |
| 709 |
|
|
case '-': |
| 710 |
|
|
case '>': |
| 711 |
|
|
rbits -= src; |
| 712 |
|
|
break; |
| 713 |
|
|
case '<': |
| 714 |
|
|
rbits.Invert(); |
| 715 |
|
|
rbits &= src; |
| 716 |
|
|
break; |
| 717 |
|
|
default: |
| 718 |
|
|
return false; |
| 719 |
|
|
} |
| 720 |
|
|
return AssignRect(dx, dy, rbits); |
| 721 |
|
|
} |
| 722 |
|
|
|
| 723 |
|
|
// Clear a rectangle |
| 724 |
|
|
void |
| 725 |
|
|
ABitMap2::ClearRect(int x, int y, int w, int h, bool clrset) |
| 726 |
|
|
{ |
| 727 |
|
|
if (x < 0) { w += x; x = 0; } |
| 728 |
|
|
if (y < 0) { h += y; y = 0; } |
| 729 |
|
|
if (w > width - x) |
| 730 |
|
|
w = width - x; |
| 731 |
|
|
if (w <= 0) |
| 732 |
|
|
return; |
| 733 |
|
|
if (h > height - y) |
| 734 |
|
|
h = height - y; |
| 735 |
|
|
if (h <= 0) |
| 736 |
|
|
return; |
| 737 |
|
|
if (w == width) // contiguous case |
| 738 |
|
|
ClearBits(y*width, h*width, clrset); |
| 739 |
|
|
else |
| 740 |
|
|
while (h--) // discontiguous |
| 741 |
|
|
ClearBits(bmi(x,y++), w, clrset); |
| 742 |
|
|
} |
| 743 |
|
|
|
| 744 |
|
|
// Get bounds of assigned region |
| 745 |
|
|
bool |
| 746 |
|
|
ABitMap2::GetBoundRect(int xymin[2], int wh[2], bool val) const |
| 747 |
|
|
{ |
| 748 |
|
|
int x=0, y=0; |
| 749 |
|
|
|
| 750 |
|
|
if (!xymin | !wh) |
| 751 |
|
|
return false; |
| 752 |
|
|
if (!Find(&x, &y, val)) { |
| 753 |
|
|
xymin[0] = xymin[1] = wh[0] = wh[1] = 0; |
| 754 |
|
|
return false; |
| 755 |
|
|
} |
| 756 |
|
|
xymin[0] = x; xymin[1] = y; |
| 757 |
|
|
int xymax[2] = {x, y}; |
| 758 |
|
|
do { |
| 759 |
|
|
if (x < xymin[0]) xymin[0] = x; |
| 760 |
|
|
xymax[1] = y; |
| 761 |
|
|
|
| 762 |
|
|
if (Check(width-1, y) == val) { |
| 763 |
|
|
xymax[0] = width-1; |
| 764 |
|
|
x = 0; ++y; |
| 765 |
|
|
continue; |
| 766 |
|
|
} |
| 767 |
|
|
if (++x < xymax[0]) x = xymax[0]; |
| 768 |
|
|
Find(&x, &y, !val); // never false after above Check() |
| 769 |
|
|
if (x-1 > xymax[0]) xymax[0] = x-1; |
| 770 |
|
|
} while (Find(&x, &y, val)); |
| 771 |
|
|
|
| 772 |
|
|
wh[0] = xymax[0] - xymin[0] + 1; |
| 773 |
|
|
wh[1] = xymax[1] - xymin[1] + 1; |
| 774 |
|
|
return true; |
| 775 |
|
|
} |
| 776 |
|
|
|
| 777 |
|
|
// Shift bitmap image right-left and down-up, filling as indicated |
| 778 |
|
|
void |
| 779 |
|
|
ABitMap2::Shift(int dx, int dy, int fill) |
| 780 |
|
|
{ |
| 781 |
|
|
int adx = (dx > 0) ? dx : -dx; |
| 782 |
|
|
int ady = (dy > 0) ? dy : -dy; |
| 783 |
|
|
if ((adx >= width) | (ady >= height)) { |
| 784 |
|
|
if (fill >= 0) |
| 785 |
|
|
ClearBitMap(fill); |
| 786 |
|
|
return; |
| 787 |
|
|
} |
| 788 |
|
|
int bitshift = dy*width + dx; |
| 789 |
|
|
if (bitshift > 0) // shift underlying bits |
| 790 |
|
|
operator<<=(bitshift); |
| 791 |
|
|
else if (bitshift < 0) |
| 792 |
|
|
operator>>=(-bitshift); |
| 793 |
|
|
else |
| 794 |
|
|
return; |
| 795 |
|
|
if (fill < 0) // no fill -- we're done |
| 796 |
|
|
return; |
| 797 |
|
|
int hmarg[4]; // new horizontal margin |
| 798 |
|
|
hmarg[0] = (dx < 0) ? width-adx : 0; |
| 799 |
|
|
hmarg[1] = (dy > 0) ? dy : 0; |
| 800 |
|
|
hmarg[2] = adx; |
| 801 |
|
|
hmarg[3] = height - ady; |
| 802 |
|
|
if (fill) { // fill corner with 1's |
| 803 |
|
|
ClearRect(hmarg[0], hmarg[1], hmarg[2], hmarg[3], true); |
| 804 |
|
|
ClearRect(0, (dy < 0) ? height-ady : 0, width, ady, true); |
| 805 |
|
|
} else { // fill side with 0's |
| 806 |
|
|
ClearRect(hmarg[0], hmarg[1]-1, hmarg[2], hmarg[3]+2); |
| 807 |
|
|
} |
| 808 |
|
|
} |
| 809 |
|
|
|
| 810 |
|
|
static inline int |
| 811 |
|
|
iSqrt(double x) |
| 812 |
|
|
{ |
| 813 |
|
|
if (x <= 0) return 0; |
| 814 |
|
|
return int(sqrt(x) + .5); |
| 815 |
|
|
} |
| 816 |
|
|
|
| 817 |
|
|
// Dilate (or erode) selection by given radius |
| 818 |
|
|
void |
| 819 |
|
|
ABitMap2::Expand(double rad, bool val) |
| 820 |
|
|
{ |
| 821 |
|
|
if (rad < 0) { |
| 822 |
|
|
rad = -rad; |
| 823 |
|
|
val = !val; |
| 824 |
|
|
} |
| 825 |
|
|
if ((width <= 0) | (rad < 1)) |
| 826 |
|
|
return; |
| 827 |
|
|
// check what we have here |
| 828 |
|
|
int xyorg[2], wh[2]; |
| 829 |
|
|
if (!GetBoundRect(xyorg, wh, val)) |
| 830 |
|
|
return; // empty bitmap! |
| 831 |
|
|
const int wh_orig[2] = {width, height}; |
| 832 |
|
|
const int irad = int(rad+.5); |
| 833 |
|
|
// optimize if >= 3/4 empty |
| 834 |
|
|
if ((width >= 128) & (height >= 128) && |
| 835 |
|
|
((wh[0] += irad<<1) <= width>>1) & |
| 836 |
|
|
((wh[1] += irad<<1) <= height>>1)) { |
| 837 |
|
|
ABitMap2 subRgn(wh[0], wh[1], !val); |
| 838 |
|
|
GetRect(&subRgn, xyorg[0] -= irad, xyorg[1] -= irad); |
| 839 |
|
|
Take(&subRgn); // work with subregion |
| 840 |
|
|
} |
| 841 |
|
|
// copy original pattern |
| 842 |
|
|
ABitMap2 origMap = *this; |
| 843 |
|
|
// stamp out larger one |
| 844 |
|
|
for (int y = -irad; y <= irad; y++) { |
| 845 |
|
|
const int spanRad = iSqrt(rad*rad - y*y); |
| 846 |
|
|
for (int x = -spanRad; x <= spanRad; x++) { |
| 847 |
|
|
if (!x & !y) continue; |
| 848 |
|
|
ABitMap2 stamp = origMap; |
| 849 |
|
|
stamp.Shift(x, y, !val); |
| 850 |
|
|
if (val) |
| 851 |
|
|
*this |= stamp; |
| 852 |
|
|
else |
| 853 |
|
|
*this &= stamp; |
| 854 |
|
|
} |
| 855 |
|
|
} |
| 856 |
|
|
if ((width == wh_orig[0]) & (height == wh_orig[1])) |
| 857 |
|
|
return; |
| 858 |
|
|
// restore original dimensions |
| 859 |
|
|
origMap.NewBitMap(wh_orig[0], wh_orig[1], !val) && |
| 860 |
|
|
origMap.AssignRect(xyorg[0], xyorg[1], *this) && |
| 861 |
|
|
Take(&origMap); |
| 862 |
|
|
} |
