mirror of
https://github.com/libretro/scummvm.git
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315 lines
7.5 KiB
C++
315 lines
7.5 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*/
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#include "common/endian.h"
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#include "graphics/dither.h"
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namespace Graphics {
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PaletteLUT::PaletteLUT(byte depth, PaletteFormat format) {
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assert((depth > 1) && (depth < 9));
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// For adjusting depth
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_depth1 = depth;
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_depth2 = 2 * _depth1;
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_shift = 8 - _depth1;
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// The table's dimensions
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_dim1 = (1 << _depth1);
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_dim2 = _dim1 * _dim1;
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_dim3 = _dim1 * _dim1 * _dim1;
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_format = format;
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// What's already built
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_got = _dim1;
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_gots = new byte[_dim1];
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// The lookup table
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_lut = new byte[_dim3];
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memset(_lutPal, 0, 768);
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memset(_realPal, 0, 768);
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memset(_gots, 1, _dim1);
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}
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void PaletteLUT::setPalette(const byte *palette, PaletteFormat format,
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byte depth, int transp) {
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assert((depth > 1) && (depth < 9));
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_transp = transp;
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int shift = 8 - depth;
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// Checking for the table's and the palette's pixel format
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if ((_format == kPaletteRGB) && (format == kPaletteYUV)) {
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byte *newPal = _realPal;
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const byte *oldPal = palette;
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for (int i = 0; i < 256; i++, newPal += 3, oldPal += 3)
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YUV2RGB(oldPal[0] << shift, oldPal[1] << shift, oldPal[2] << shift,
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newPal[0], newPal[1], newPal[2]);
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} else if ((_format == kPaletteYUV) && (format == kPaletteRGB)) {
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byte *newPal = _realPal;
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const byte *oldPal = palette;
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for (int i = 0; i < 256; i++, newPal += 3, oldPal += 3)
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RGB2YUV(oldPal[0] << shift, oldPal[1] << shift, oldPal[2] << shift,
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newPal[0], newPal[1], newPal[2]);
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} else
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memcpy(_realPal, palette, 768);
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// Using the specified depth for the lookup
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byte *newPal = _lutPal, *oldPal = _realPal;
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for (int i = 0; i < 768; i++)
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*newPal++ = (*oldPal++) >> _shift;
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// Everything has to be rebuilt
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_got = 0;
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memset(_gots, 0, _dim1);
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}
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PaletteLUT::~PaletteLUT() {
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delete[] _lut;
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delete[] _gots;
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}
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void PaletteLUT::buildNext() {
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if (_got >= _dim1)
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return;
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build(_got++);
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}
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#define SQR(x) ((x) * (x))
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// Building one "slice"
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void PaletteLUT::build(int d1) {
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// First dimension
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byte *lut = _lut + d1 * _dim2;
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// Second dimension
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for (uint32 j = 0; j < _dim1; j++) {
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// Third dimension
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for (uint32 k = 0; k < _dim1; k++) {
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const byte *p = _lutPal;
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uint32 d = 0xFFFFFFFF;
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byte n = 0;
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// Going over every palette entry, searching for the closest
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for (int c = 0; c < 256; c++, p += 3) {
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// Ignore the transparent color
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if (c == _transp)
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continue;
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uint32 di = SQR(d1 - p[0]) + SQR(j - p[1]) + SQR(k - p[2]);
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if (di < d) {
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d = di;
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n = c;
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if (d == 0)
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break;
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}
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}
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*lut++ = n;
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}
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}
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// Got this slice now
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_gots[d1] = 1;
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}
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inline int PaletteLUT::getIndex(byte c1, byte c2, byte c3) const {
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return ((c1 >> _shift) << _depth2) | ((c2 >> _shift) << _depth1) | (c3 >> _shift);
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}
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void PaletteLUT::getEntry(byte index, byte &c1, byte &c2, byte &c3) const {
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c1 = _realPal[index * 3 + 0];
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c2 = _realPal[index * 3 + 1];
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c3 = _realPal[index * 3 + 2];
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}
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byte PaletteLUT::findNearest(byte c1, byte c2, byte c3) {
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return _lut[getIndex(c1, c2, c3)];
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}
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byte PaletteLUT::findNearest(byte c1, byte c2, byte c3, byte &nC1, byte &nC2, byte &nC3) {
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// If we don't have the required "slice" yet, build it
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if (!_gots[c1 >> _shift])
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build(c1 >> _shift);
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int palIndex = _lut[getIndex(c1, c2, c3)];
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int i = palIndex * 3;
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nC1 = _realPal[i + 0];
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nC2 = _realPal[i + 1];
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nC3 = _realPal[i + 2];
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return palIndex;
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}
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bool PaletteLUT::save(Common::WriteStream &stream) {
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// The table has to be completely built before we can save
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while (_got < _dim1)
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buildNext();
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stream.writeUint32BE(MKID_BE('PLUT')); // Magic
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stream.writeUint32BE(kVersion);
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stream.writeByte(_depth1);
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if (stream.write(_realPal, 768) != 768)
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return false;
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if (stream.write(_lutPal, 768) != 768)
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return false;
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if (stream.write(_lut, _dim3) != _dim3)
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return false;
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if (!stream.flush())
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return false;
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if (stream.err())
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return false;
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return true;
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}
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bool PaletteLUT::load(Common::SeekableReadStream &stream) {
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// _realPal + _lutPal + _lut + _depth1 + magic + version
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int32 needSize = 768 + 768 + _dim3 + 1 + 4 + 4;
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if ((stream.size() - stream.pos()) < needSize)
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return false;
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// Magic
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if (stream.readUint32BE() != MKID_BE('PLUT'))
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return false;
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if (stream.readUint32BE() != kVersion)
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return false;
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byte depth1 = stream.readByte();
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if (depth1 != _depth1)
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return false;
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if (stream.read(_realPal, 768) != 768)
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return false;
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if (stream.read(_lutPal, 768) != 768)
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return false;
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if (stream.read(_lut, _dim3) != _dim3)
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return false;
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_got = _dim1;
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memset(_gots, 1, _dim1);
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return true;
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}
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SierraLight::SierraLight(int16 width, PaletteLUT *palLUT) {
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assert(width > 0);
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_width = width;
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_palLUT = palLUT;
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// Big buffer for the errors of the current and next line
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_errorBuf = new int32[3 * (2 * (_width + 2*1))];
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memset(_errorBuf, 0, (3 * (2 * (_width + 2*1))) * sizeof(int32));
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_curLine = 0;
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_errors[0] = _errorBuf + 3;
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_errors[1] = _errors[0] + 3 * (_width + 2*1);
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}
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SierraLight::~SierraLight() {
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delete[] _errorBuf;
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}
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void SierraLight::newFrame() {
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_curLine = 0;
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memset(_errors[0], 0, 3 * _width * sizeof(int32));
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memset(_errors[1], 0, 3 * _width * sizeof(int32));
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}
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void SierraLight::nextLine() {
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// Clear the finished line, it will become the last line in the buffer
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memset(_errors[_curLine], 0, 3 * _width * sizeof(int32));
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_curLine = (_curLine + 1) % 2;
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}
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byte SierraLight::dither(byte c1, byte c2, byte c3, uint32 x) {
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assert(_palLUT);
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assert(x < (uint32)_width);
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int32 eC1, eC2, eC3;
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getErrors(x, eC1, eC2, eC3);
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// Apply error on values
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c1 = CLIP<int>(c1 + eC1, 0, 255);
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c2 = CLIP<int>(c2 + eC2, 0, 255);
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c3 = CLIP<int>(c3 + eC3, 0, 255);
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// Find color
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byte newC1, newC2, newC3;
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byte newPixel = _palLUT->findNearest(c1, c2, c3, newC1, newC2, newC3);
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// Calculate new error
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eC1 = c1 - newC1;
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eC2 = c2 - newC2;
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eC3 = c3 - newC3;
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// Add them
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addErrors(x, eC1, eC2, eC3);
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return newPixel;
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}
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inline void SierraLight::getErrors(uint32 x, int32 &eC1, int32 &eC2, int32 &eC3) {
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int32 *errCur = _errors[_curLine];
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x *= 3;
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eC1 = errCur[x + 0] >> 2;
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eC2 = errCur[x + 1] >> 2;
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eC3 = errCur[x + 2] >> 2;
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}
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inline void SierraLight::addErrors(uint32 x, int32 eC1, int32 eC2, int32 eC3) {
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int32 *errCur = _errors[_curLine];
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int32 *errNext = _errors[(_curLine + 1) % 2];
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// Indices for current error
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int x0 = 3 * (x + 1);
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int x1 = 3 * (x + 0);
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int x2 = 3 * (x - 1);
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errCur [x0 + 0] += eC1 << 1;
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errCur [x0 + 1] += eC2 << 1;
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errCur [x0 + 2] += eC3 << 1;
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errNext[x1 + 0] += eC1;
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errNext[x1 + 1] += eC2;
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errNext[x1 + 2] += eC3;
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errNext[x2 + 0] += eC1;
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errNext[x2 + 1] += eC2;
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errNext[x2 + 2] += eC3;
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}
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} // End of namespace Graphics
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