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pal.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-13-1/engines/cine/pal.cpp $
 * $Id: pal.cpp 35648 2009-01-01 15:06:43Z sev $
 *
 */

#include "cine/cine.h"
#include "cine/various.h"

namespace Cine {

Common::Array<PalEntry> palArray;
static byte paletteBuffer1[16];
static byte paletteBuffer2[16];

void loadPal(const char *fileName) {
      char buffer[20];

      removeExtention(buffer, fileName);

      strcat(buffer, ".PAL");
      palArray.clear();

      Common::File palFileHandle;
      if (!palFileHandle.open(buffer))
            error("loadPal(): Cannot open file %s", fileName);

      uint16 palEntriesCount = palFileHandle.readUint16LE();
      palFileHandle.readUint16LE(); // entry size

      palArray.resize(palEntriesCount);
      for (uint i = 0; i < palArray.size(); ++i) {
            palFileHandle.read(palArray[i].name, 10);
            palFileHandle.read(palArray[i].pal1, 16);
            palFileHandle.read(palArray[i].pal2, 16);
      }
      palFileHandle.close();
}

int16 findPaletteFromName(const char *fileName) {
      char buffer[10];
      uint16 position = 0;
      uint16 i;

      strcpy(buffer, fileName);

      while (position < strlen(fileName)) {
            if (buffer[position] > 'a' && buffer[position] < 'z') {
                  buffer[position] += 'A' - 'a';
            }

            position++;
      }

      for (i = 0; i < palArray.size(); i++) {
            if (!strcmp(buffer, palArray[i].name)) {
                  return i;
            }
      }

      return -1;

}

void loadRelatedPalette(const char *fileName) {
      char localName[16];
      byte i;
      int16 paletteIndex;

      removeExtention(localName, fileName);

      paletteIndex = findPaletteFromName(localName);

      if (paletteIndex == -1) {
            for (i = 0; i < 16; i++) {    // generate default palette
                  paletteBuffer1[i] = paletteBuffer2[i] = (i << 4) + i;
            }
      } else {
            assert(paletteIndex < (int32)palArray.size());
            memcpy(paletteBuffer1, palArray[paletteIndex].pal1, 16);
            memcpy(paletteBuffer2, palArray[paletteIndex].pal2, 16);
      }
}

void palRotate(uint16 *pal, byte a, byte b, byte c) {
      assert(pal);

      if (c == 1) {
            uint16 currentColor = pal[b];

            for (int i = b; i > a; i--) {
                  pal[i] = pal[i - 1];
            }

            pal[a] = currentColor;
      }
}

void palRotate(byte *pal, byte a, byte b, byte c) {
      assert(pal);

      if (c == 1) {
            byte currentR = pal[3 * b + 0];
            byte currentG = pal[3 * b + 1];
            byte currentB = pal[3 * b + 2];

            for (int i = b; i > a; i--) {
                  pal[3 * i + 0] = pal[3 * (i - 1) + 0];
                  pal[3 * i + 1] = pal[3 * (i - 1) + 1];
                  pal[3 * i + 2] = pal[3 * (i - 1) + 2];
            }

            pal[3 * a + 0] = currentR;
            pal[3 * a + 1] = currentG;
            pal[3 * a + 2] = currentB;
      }
}

uint16 transformColor(uint16 baseColor, int r, int g, int b) {
      int8 oriR = CLIP( (baseColor & 0x007)       + b, 0, 7);
      int8 oriG = CLIP(((baseColor & 0x070) >> 4) + g, 0, 7);
      int8 oriB = CLIP(((baseColor & 0x700) >> 8) + r, 0, 7);

      return oriR | (oriG << 4) | (oriB << 8);
}

void transformPaletteRange(uint16 *dstPal, uint16 *srcPal, int startColor, int stopColor, int r, int g, int b) {
      assert(srcPal && dstPal);

      for (int i = startColor; i <= stopColor; i++) {
            dstPal[i] = transformColor(srcPal[i], r, g, b);
      }
}

void transformPaletteRange(byte *dstPal, byte *srcPal, int startColor, int stopColor, int r, int g, int b) {
      assert(srcPal && dstPal);

      for (int i = startColor; i <= stopColor; i++) {
            dstPal[3 * i + 0] = CLIP(srcPal[3 * i + 0] + r * 36, 0, 252);
            dstPal[3 * i + 1] = CLIP(srcPal[3 * i + 1] + g * 36, 0, 252);
            dstPal[3 * i + 2] = CLIP(srcPal[3 * i + 2] + b * 36, 0, 252);
      }
}

byte& Palette::getComponent(byte colorIndex, byte componentIndex) {
      assert(colorIndex < getColorCount() && componentIndex < COMPONENTS_PER_COLOR);
      return _colors[colorIndex * COMPONENTS_PER_COLOR + componentIndex];
}

void Palette::setComponent(byte colorIndex, byte componentIndex, byte value) {
      getComponent(colorIndex, componentIndex) = value;
}

Palette::PackedColor Palette::getColor(byte colorIndex) {
      return (getComponent(colorIndex, R_INDEX) << (R_INDEX * BITS_PER_COMPONENT)) |
               (getComponent(colorIndex, G_INDEX) << (G_INDEX * BITS_PER_COMPONENT)) |
               (getComponent(colorIndex, B_INDEX) << (B_INDEX * BITS_PER_COMPONENT)) |
               (getComponent(colorIndex, A_INDEX) << (A_INDEX * BITS_PER_COMPONENT));
}

void Palette::setColor(byte colorIndex, PackedColor color) {
      setComponent(colorIndex, R_INDEX, (color >> (R_INDEX * BITS_PER_COMPONENT)) & COMPONENT_MASK);
      setComponent(colorIndex, G_INDEX, (color >> (G_INDEX * BITS_PER_COMPONENT)) & COMPONENT_MASK);
      setComponent(colorIndex, B_INDEX, (color >> (B_INDEX * BITS_PER_COMPONENT)) & COMPONENT_MASK);
      setComponent(colorIndex, A_INDEX, (color >> (A_INDEX * BITS_PER_COMPONENT)) & COMPONENT_MASK);
}

// a.k.a. palRotate
Palette& Palette::rotateRight(byte firstIndex, byte lastIndex) {
      PackedColor lastColor = getColor(lastIndex);

      for (int i = lastIndex; i > firstIndex; i--) {
            setColor(i, getColor(i - 1));
      }

      setColor(firstIndex, lastColor);
      return *this;
}

uint Palette::getColorCount() const {
      return _colors.size() / COMPONENTS_PER_COLOR;
}

// a.k.a. transformPaletteRange
Palette& Palette::saturatedAddColor(byte firstIndex, byte lastIndex, signed r, signed g, signed b) {
      for (uint i = firstIndex; i <= lastIndex; i++) {
            saturatedAddColor(i, r, g, b);
      }
      return *this;
}

// a.k.a. transformColor
// Parameter color components (i.e. r, g and b) are in range [-7, 7]
// e.g. r = 7 sets the resulting color's red component to maximum
// e.g. r = -7 sets the resulting color's red component to minimum (i.e. zero)
void Palette::saturatedAddColor(byte index, signed r, signed g, signed b) {
      byte newR = CLIP<int>(getComponent(index, R_INDEX) + r * COMPONENT_MUL, 0, COMPONENT_MAX);
      byte newG = CLIP<int>(getComponent(index, G_INDEX) + g * COMPONENT_MUL, 0, COMPONENT_MAX);
      byte newB = CLIP<int>(getComponent(index, B_INDEX) + b * COMPONENT_MUL, 0, COMPONENT_MAX);

      setComponent(index, R_INDEX, newR);
      setComponent(index, G_INDEX, newG);
      setComponent(index, B_INDEX, newB);
}

Palette& Palette::load9BitColors(uint16 *colors, uint colorCount) {
      setColorCount(colorCount);
      for (uint i = 0; i < colorCount; i++) {
            setComponent(i, R_INDEX, ((colors[i] >> 8) & 7) * COMPONENT_MUL);
            setComponent(i, G_INDEX, ((colors[i] >> 4) & 7) * COMPONENT_MUL);
            setComponent(i, B_INDEX, ((colors[i] >> 0) & 7) * COMPONENT_MUL);
            setComponent(i, A_INDEX, 0);
      }
      return *this;
}

Palette& Palette::load24BitColors(byte *colors, uint colorCount) {
      setColorCount(colorCount);
      for (uint i = 0; i < colorCount; i++) {
            setComponent(i, R_INDEX, colors[i * 3 + 0]);
            setComponent(i, G_INDEX, colors[i * 3 + 1]);
            setComponent(i, B_INDEX, colors[i * 3 + 2]);
            setComponent(i, A_INDEX, 0);
      }
      return *this;
}

void Palette::setColorCount(uint colorCount) {
      _colors.resize(colorCount * COMPONENTS_PER_COLOR);
}

} // End of namespace Cine

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