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engines/sci/graphics/drivers/vgagrey.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 "common/system.h"
+#include "sci/graphics/drivers/gfxdriver_intern.h"
+
+namespace Sci {
+
+class SCI1_VGAGreyScaleDriver final : public GfxDefaultDriver {
+public:
+	SCI1_VGAGreyScaleDriver(bool rgbRendering);
+	~SCI1_VGAGreyScaleDriver() override;
+	void setPalette(const byte *colors, uint start, uint num, bool update, const PaletteMod *palMods, const byte *palModMapping) override;
+	static bool validateMode(Common::Platform p) { return (p == Common::kPlatformDOS || p == Common::kPlatformWindows) && checkDriver(&_driverFile, 1); }
+private:
+	byte *_greyScalePalette;
+	static const char *_driverFile;
+};
+
+SCI1_VGAGreyScaleDriver::SCI1_VGAGreyScaleDriver(bool rgbRendering) : GfxDefaultDriver(320, 200, false, rgbRendering), _greyScalePalette(nullptr) {
+	_greyScalePalette = new byte[_numColors * 3]();
+}
+
+SCI1_VGAGreyScaleDriver::~SCI1_VGAGreyScaleDriver() {
+	delete[] _greyScalePalette;
+}
+
+void SCI1_VGAGreyScaleDriver::setPalette(const byte *colors, uint start, uint num, bool update, const PaletteMod *palMods, const byte *palModMapping) {
+	GFXDRV_ASSERT_READY;
+	byte *d = _greyScalePalette;
+	for (uint i = 0; i < num; ++i) {
+		// In the driver files I inspected there were never any other color distributions than this.
+		// So I guess it is safe to hardcode that instead of loading it from the driver file.
+		d[0] = d[1] = d[2] = (colors[0] * 77 + colors[1] * 150 + colors[2] * 28) >> 8;
+		colors += 3;
+		d += 3;
+	}
+
+	GfxDefaultDriver::setPalette(_greyScalePalette, start, num, update, palMods, palModMapping);
+}
+
+const char *SCI1_VGAGreyScaleDriver::_driverFile = "VGA320BW.DRV";
+
+SCI_GFXDRV_VALIDATE_IMPL(SCI1_VGAGreyScale)
+
+GfxDriver *SCI1_VGAGreyScaleDriver_create(int rgbRendering, ...) {
+	return new SCI1_VGAGreyScaleDriver(rgbRendering != 0);
+}
+
+} // End of namespace Sci