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engines/sword25/gfx/image/imgloader.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 "sword25/gfx/image/image.h"
+#include "sword25/gfx/image/imgloader.h"
+#include "graphics/pixelformat.h"
+#include "graphics/surface.h"
+#include "image/png.h"
+
+namespace Sword25 {
+
+bool ImgLoader::decodePNGImage(const byte *fileDataPtr, uint fileSize, Graphics::Surface *dest) {
+	assert(dest);
+	Common::MemoryReadStream *fileStr = new Common::MemoryReadStream(fileDataPtr, fileSize, DisposeAfterUse::NO);
+
+	::Image::PNGDecoder png;
+	if (!png.loadStream(*fileStr)) // the fileStr pointer, and thus pFileData will be deleted after this is done
+		error("Error while reading PNG image");
+
+	const Graphics::Surface *sourceSurface = png.getSurface();
+	Graphics::Surface *pngSurface = sourceSurface->convertTo(Graphics::PixelFormat(4, 8, 8, 8, 8, 24, 16, 8, 0), png.getPalette().data(), png.getPalette().size());
+
+	dest->copyFrom(*pngSurface);
+
+	pngSurface->free();
+	delete pngSurface;
+	delete fileStr;
+
+	// Signal success
+	return true;
+}
+
+bool ImgLoader::decodeThumbnailImage(const byte *pFileData, uint fileSize, Graphics::Surface *dest) {
+	assert(dest);
+	const byte *src = pFileData + 4;	// skip header
+	uint width = READ_LE_UINT16(src); src += 2;
+	uint height = READ_LE_UINT16(src); src += 2;
+	src++;	// version, ignored for now
+
+	dest->create(width, height, Graphics::PixelFormat(4, 8, 8, 8, 8, 24, 16, 8, 0));
+	uint32 *dst = (uint32 *)dest->getBasePtr(0, 0); // treat as uint32, for pixelformat output
+	byte r, g, b;
+
+	for (uint32 i = 0; i < width * height; i++) {
+		r = *src++;
+		g = *src++;
+		b = *src++;
+		*dst++ = dest->format.RGBToColor(r, g, b);
+	}
+
+	return true;
+}
+
+} // End of namespace Sword25