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engines/stark/visual/flashingimage.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 "engines/stark/visual/flashingimage.h"
+
+#include "common/random.h"
+#include "graphics/surface.h"
+
+#include "engines/stark/gfx/driver.h"
+#include "engines/stark/gfx/surfacerenderer.h"
+#include "engines/stark/gfx/bitmap.h"
+
+#include "engines/stark/services/global.h"
+#include "engines/stark/services/services.h"
+#include "engines/stark/services/settings.h"
+
+namespace Stark {
+
+const float VisualFlashingImage::_fadeValueMax = 0.55f;
+
+VisualFlashingImage::VisualFlashingImage(Gfx::Driver *gfx) :
+		Visual(TYPE),
+		_gfx(gfx),
+		_bitmap(nullptr),
+		_fadeLevelIncreasing(true),
+		_fadeLevel(0),
+		_flashingTimeRemaining(150 * 33),
+		_originalWidth(0),
+		_originalHeight(0) {
+	_surfaceRenderer = _gfx->createSurfaceRenderer();
+}
+
+VisualFlashingImage::~VisualFlashingImage() {
+	delete _bitmap;
+	delete _surfaceRenderer;
+}
+
+void VisualFlashingImage::initFromSurface(const Graphics::Surface *surface, uint originalWidth, uint originalHeight) {
+	assert(!_bitmap);
+
+	_originalWidth  = originalWidth;
+	_originalHeight = originalHeight;
+
+	_bitmap = _gfx->createBitmap(surface);
+	_bitmap->setSamplingFilter(StarkSettings->getImageSamplingFilter());
+}
+
+void VisualFlashingImage::updateFadeLevel() {
+	uint millisecondsPerGameloop = StarkGlobal->getMillisecondsPerGameloop();
+	if (_flashingTimeRemaining > 0) {
+		_flashingTimeRemaining -= millisecondsPerGameloop;
+		if (_fadeLevelIncreasing) {
+			_fadeLevel += 0.0022f * millisecondsPerGameloop;
+		}
+		else {
+			_fadeLevel -= 0.0022f * millisecondsPerGameloop;
+		}
+		if (ABS(_fadeLevel) >= _fadeValueMax) {
+			_fadeLevelIncreasing = !_fadeLevelIncreasing;
+			_fadeLevel = CLIP(_fadeLevel, -_fadeValueMax, _fadeValueMax);
+		}
+	} else {
+		_fadeLevel = 0;
+	}
+}
+
+void VisualFlashingImage::render(const Common::Point &position) {
+	updateFadeLevel();
+
+	_surfaceRenderer->setFadeLevel(_fadeLevel);
+	_surfaceRenderer->render(_bitmap, position, _originalWidth, _originalHeight);
+}
+
+} // End of namespace Stark