From 26ee630756ebdd7c96bccede0881a8c8b98e8f2b Mon Sep 17 00:00:00 2001
From: Max Horn
Date: Sat, 11 Feb 2006 22:45:04 +0000
Subject: Moved engines to the new engines/ directory

svn-id: r20582
---
 engines/scumm/thumbnail.cpp | 140 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 engines/scumm/thumbnail.cpp

(limited to 'engines/scumm/thumbnail.cpp')

diff --git a/engines/scumm/thumbnail.cpp b/engines/scumm/thumbnail.cpp
new file mode 100644
index 0000000000..eefc34286a
--- /dev/null
+++ b/engines/scumm/thumbnail.cpp
@@ -0,0 +1,140 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2001  Ludvig Strigeus
+ * Copyright (C) 2001-2006 The ScummVM project
+ *
+ * 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 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed file 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#include "common/stdafx.h"
+#include "common/system.h"
+#include "common/savefile.h"
+#include "common/scaler.h"
+#include "scumm/scumm.h"
+
+namespace Scumm {
+
+#define THMB_VERSION 1
+
+#if !defined(__GNUC__)
+	#pragma START_PACK_STRUCTS
+#endif
+
+struct ThumbnailHeader {
+	uint32 type;
+	uint32 size;
+	byte version;
+	uint16 width, height;
+	byte bpp;
+} GCC_PACK;
+
+#if !defined(__GNUC__)
+	#pragma END_PACK_STRUCTS
+#endif
+
+
+inline void colorToRGB(uint16 color, uint8 &r, uint8 &g, uint8 &b) {
+	r = (((color >> 11) & 0x1F) << 3);
+	g = (((color >> 5) & 0x3F) << 2);
+	b = ((color&0x1F) << 3);
+}
+
+Graphics::Surface *ScummEngine::loadThumbnail(Common::InSaveFile *file) {
+	ThumbnailHeader header;
+	file->read(&header.type, 4);
+	// We also accept the bad 'BMHT' header here, for the sake of compatibility
+	// with some older savegames which were written incorrectly due to a bug in
+	// ScummVM which wrote the thumb header type incorrectly on LE systems.
+	if (header.type != MKID('THMB') && header.type != MKID('BMHT'))
+		return 0;
+
+	header.size = file->readUint32BE();
+	header.version = file->readByte();
+
+	if (header.version > THMB_VERSION) {
+		file->skip(header.size - 9);
+		warning("Loading a newer thumbnail version");
+		return 0;
+	}
+
+	header.width = file->readUint16BE();
+	header.height = file->readUint16BE();
+	header.bpp = file->readByte();
+
+	// TODO: support other bpp values than 2
+	if (header.bpp != 2) {
+		file->skip(header.size - 14);
+		return 0;
+	}
+
+	Graphics::Surface *thumb = new Graphics::Surface();
+	thumb->create(header.width, header.height, sizeof(uint16));
+
+	uint16* pixels = (uint16 *)thumb->pixels;
+
+	for (int y = 0; y < thumb->h; ++y) {
+		for (int x = 0; x < thumb->w; ++x) {
+			uint8 r, g, b;
+			colorToRGB(file->readUint16BE(), r, g, b);
+
+			// converting to current OSystem Color
+			*pixels++ = _system->RGBToColor(r, g, b);
+		}
+	}
+
+	return thumb;
+}
+
+void ScummEngine::saveThumbnail(Common::OutSaveFile *file) {
+	Graphics::Surface thumb;
+
+#ifndef PALMOS_68K
+	if (!createThumbnailFromScreen(&thumb))
+#endif
+		thumb.create(kThumbnailWidth, kThumbnailHeight2, sizeof(uint16));
+
+	ThumbnailHeader header;
+	header.type = MKID('THMB');
+#if defined(PALMOS_ARM) || defined(__GP32__)
+	// sizeof(header) is hardcoded here, because the compiler add padding to
+	// have a 4byte aligned struct and there is no easy way to pack it.
+	header.size = 14 + thumb.w*thumb.h*thumb.bytesPerPixel;
+#else
+	header.size = sizeof(header) + thumb.w*thumb.h*thumb.bytesPerPixel;
+#endif
+	header.version = THMB_VERSION;
+	header.width = thumb.w;
+	header.height = thumb.h;
+	header.bpp = thumb.bytesPerPixel;
+
+	file->write(&header.type, 4);
+	file->writeUint32BE(header.size);
+	file->writeByte(header.version);
+	file->writeUint16BE(header.width);
+	file->writeUint16BE(header.height);
+	file->writeByte(header.bpp);
+
+	// TODO: for later this shouldn't be casted to uint16...
+	uint16* pixels = (uint16 *)thumb.pixels;
+	for (uint16 p = 0; p < thumb.w*thumb.h; ++p, ++pixels)
+		file->writeUint16BE(*pixels);
+
+	thumb.free();
+}
+
+} // end of namespace Scumm
-- 
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