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engines/sword25/gfx/screenshot.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/>.
+ *
+ */
+
+/*
+ * This code is based on Broken Sword 2.5 engine
+ *
+ * Copyright (c) Malte Thiesen, Daniel Queteschiner and Michael Elsdoerfer
+ *
+ * Licensed under GNU GPL v2
+ *
+ */
+
+#include "common/memstream.h"
+#include "common/textconsole.h"
+#include "sword25/gfx/screenshot.h"
+#include "sword25/kernel/filesystemutil.h"
+
+namespace Sword25 {
+
+#define THUMBNAIL_VERSION 1
+
+bool Screenshot::saveToFile(Graphics::Surface *data, Common::WriteStream *stream) {
+	// Convert the RGBA data to RGB
+	const uint32 *pSrc = (const uint32 *)data->getPixels();
+
+	// Write our own custom header
+	stream->writeUint32BE(MKTAG('S','C','R','N'));	// SCRN, short for "Screenshot"
+	stream->writeUint16LE(data->w);
+	stream->writeUint16LE(data->h);
+	stream->writeByte(THUMBNAIL_VERSION);
+
+	for (int y = 0; y < data->h; y++) {
+		for (int x = 0; x < data->w; x++) {
+			// This is only called by createThumbnail below, which
+			// provides a fake 'surface' with LE data in it.
+			byte a, r, g, b;
+
+			data->format.colorToARGB(*pSrc++, a, r, g, b);
+			stream->writeByte(r);
+			stream->writeByte(g);
+			stream->writeByte(b);
+		}
+	}
+
+	return true;
+}
+
+// -----------------------------------------------------------------------------
+
+Common::SeekableReadStream *Screenshot::createThumbnail(Graphics::Surface *data) {
+	// This method takes a screen image with a dimension of 800x600, and creates a screenshot with a dimension of 200x125.
+	// First 50 pixels are cut off the top and bottom (the interface boards in the game). The remaining image of 800x500
+	// will be on a 16th of its size, reduced by being handed out in 4x4 pixel blocks and the average of each block
+	// generates a pixel of the target image. Finally, the result as a PNG file is stored as a file.
+
+	// The source image must be 800x600.
+	if (data->w != 800 || data->h != 600 || data->format.bytesPerPixel != 4) {
+		error("The sreenshot dimensions have to be 800x600 in order to be saved as a thumbnail.");
+		return 0;
+	}
+
+	// Buffer for the output thumbnail
+	Graphics::Surface thumbnail;
+	thumbnail.create(200, 125, g_system->getScreenFormat());
+
+	// Uber das Zielbild iterieren und einen Pixel zur Zeit berechnen.
+	uint x, y;
+	x = y = 0;
+
+	for (uint32 *pDest = (uint32 *)thumbnail.getPixels(); pDest < thumbnail.getBasePtr(0, thumbnail.h); ) {
+		// Get an average over a 4x4 pixel block in the source image
+		int alpha, red, green, blue;
+		alpha = red = green = blue = 0;
+		for (int j = 0; j < 4; ++j) {
+			const uint32 *srcP = (const uint32 *)data->getBasePtr(x * 4, y * 4 + j + 50);
+			for (int i = 0; i < 4; ++i) {
+				byte a, r, g, b;
+				data->format.colorToARGB(*(srcP + i), a, r, g, b);
+				alpha += a;
+				red += r;
+				green += g;
+				blue += b;
+			}
+		}
+
+		*pDest++ = thumbnail.format.ARGBToColor(alpha / 16, red / 16, green / 16, blue / 16);
+
+		// Move to next block
+		++x;
+		if (x == (uint)thumbnail.w) {
+			x = 0;
+			++y;
+		}
+	}
+
+	// Create a PNG representation of the thumbnail data
+	Common::MemoryWriteStreamDynamic stream(DisposeAfterUse::NO);
+	saveToFile(&thumbnail, &stream);
+	thumbnail.free();
+
+	// Output a MemoryReadStream that encompasses the written data
+	Common::SeekableReadStream *result = new Common::MemoryReadStream(stream.getData(), stream.size(),
+		DisposeAfterUse::YES);
+	return result;
+}
+
+} // End of namespace Sword25