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engines/sci/graphics/remap.cpp

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+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "sci/sci.h"
+#include "sci/graphics/palette16.h"
+#include "sci/graphics/remap.h"
+#include "sci/graphics/screen.h"
+
+namespace Sci {
+
+GfxRemap::GfxRemap(GfxPalette *palette)
+	: _palette(palette) {
+	_remapOn = false;
+	resetRemapping();
+}
+
+byte GfxRemap::remapColor(byte remappedColor, byte screenColor) {
+	assert(_remapOn);
+	if (_remappingType[remappedColor] == kRemapByRange)
+		return _remappingByRange[screenColor];
+	else if (_remappingType[remappedColor] == kRemapByPercent)
+		return _remappingByPercent[screenColor];
+	else
+		error("remapColor(): Color %d isn't remapped", remappedColor);
+
+	return 0;	// should never reach here
+}
+
+void GfxRemap::resetRemapping() {
+	_remapOn = false;
+	_remappingPercentToSet = 0;
+
+	for (int i = 0; i < 256; i++) {
+		_remappingType[i] = kRemapNone;
+		_remappingByPercent[i] = i;
+		_remappingByRange[i] = i;
+	}
+}
+
+void GfxRemap::setRemappingPercent(byte color, byte percent) {
+	_remapOn = true;
+
+	// We need to defer the setup of the remapping table every time the screen
+	// palette is changed, so that kernelFindColor() can find the correct
+	// colors. Set it once here, in case the palette stays the same and update
+	// it on each palette change by copySysPaletteToScreen().
+	_remappingPercentToSet = percent;
+
+	for (int i = 0; i < 256; i++) {
+		byte r = _palette->_sysPalette.colors[i].r * _remappingPercentToSet / 100;
+		byte g = _palette->_sysPalette.colors[i].g * _remappingPercentToSet / 100;
+		byte b = _palette->_sysPalette.colors[i].b * _remappingPercentToSet / 100;
+		_remappingByPercent[i] = _palette->kernelFindColor(r, g, b);
+	}
+
+	_remappingType[color] = kRemapByPercent;
+}
+
+void GfxRemap::setRemappingRange(byte color, byte from, byte to, byte base) {
+	_remapOn = true;
+
+	for (int i = from; i <= to; i++) {
+		_remappingByRange[i] = i + base;
+	}
+
+	_remappingType[color] = kRemapByRange;
+}
+
+void GfxRemap::updateRemapping() {
+	// Check if we need to reset remapping by percent with the new colors.
+	if (_remappingPercentToSet) {
+		for (int i = 0; i < 256; i++) {
+			byte r = _palette->_sysPalette.colors[i].r * _remappingPercentToSet / 100;
+			byte g = _palette->_sysPalette.colors[i].g * _remappingPercentToSet / 100;
+			byte b = _palette->_sysPalette.colors[i].b * _remappingPercentToSet / 100;
+			_remappingByPercent[i] = _palette->kernelFindColor(r, g, b);
+		}
+	}
+}
+} // End of namespace Sci