mirror of
https://github.com/libretro/scummvm.git
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142 lines
3.8 KiB
C++
142 lines
3.8 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2001 Ludvig Strigeus
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* Copyright (C) 2001-2006 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed file the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#include "common/stdafx.h"
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#include "common/system.h"
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#include "common/savefile.h"
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#include "graphics/scaler.h"
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#include "scumm/scumm.h"
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namespace Scumm {
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#define THMB_VERSION 1
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#if !defined(__GNUC__)
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#pragma START_PACK_STRUCTS
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#endif
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struct ThumbnailHeader {
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uint32 type;
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uint32 size;
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byte version;
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uint16 width, height;
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byte bpp;
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} GCC_PACK;
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#if !defined(__GNUC__)
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#pragma END_PACK_STRUCTS
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#endif
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inline void colorToRGB(uint16 color, uint8 &r, uint8 &g, uint8 &b) {
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r = (((color >> 11) & 0x1F) << 3);
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g = (((color >> 5) & 0x3F) << 2);
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b = ((color&0x1F) << 3);
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}
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Graphics::Surface *ScummEngine::loadThumbnail(Common::InSaveFile *file) {
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ThumbnailHeader header;
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header.type = file->readUint32BE();
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// We also accept the bad 'BMHT' header here, for the sake of compatibility
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// with some older savegames which were written incorrectly due to a bug in
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// ScummVM which wrote the thumb header type incorrectly on LE systems.
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if (header.type != MKID_BE('THMB') && header.type != MKID_BE('BMHT'))
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return 0;
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header.size = file->readUint32BE();
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header.version = file->readByte();
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if (header.version > THMB_VERSION) {
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file->skip(header.size - 9);
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warning("Loading a newer thumbnail version");
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return 0;
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}
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header.width = file->readUint16BE();
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header.height = file->readUint16BE();
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header.bpp = file->readByte();
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// TODO: support other bpp values than 2
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if (header.bpp != 2) {
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file->skip(header.size - 14);
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return 0;
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}
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Graphics::Surface *thumb = new Graphics::Surface();
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thumb->create(header.width, header.height, sizeof(uint16));
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uint16* pixels = (uint16 *)thumb->pixels;
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for (int y = 0; y < thumb->h; ++y) {
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for (int x = 0; x < thumb->w; ++x) {
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uint8 r, g, b;
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colorToRGB(file->readUint16BE(), r, g, b);
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// converting to current OSystem Color
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*pixels++ = _system->RGBToColor(r, g, b);
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}
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}
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return thumb;
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}
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void ScummEngine::saveThumbnail(Common::OutSaveFile *file) {
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Graphics::Surface thumb;
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#ifndef PALMOS_68K
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if (!createThumbnailFromScreen(&thumb))
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#endif
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thumb.create(kThumbnailWidth, kThumbnailHeight2, sizeof(uint16));
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ThumbnailHeader header;
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header.type = MKID_BE('THMB');
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#if defined(PALMOS_ARM) || defined(__GP32__)
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// sizeof(header) is hardcoded here, because the compiler add padding to
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// have a 4byte aligned struct and there is no easy way to pack it.
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header.size = 14 + thumb.w*thumb.h*thumb.bytesPerPixel;
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#else
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header.size = sizeof(header) + thumb.w*thumb.h*thumb.bytesPerPixel;
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#endif
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header.version = THMB_VERSION;
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header.width = thumb.w;
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header.height = thumb.h;
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header.bpp = thumb.bytesPerPixel;
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file->writeUint32BE(header.type);
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file->writeUint32BE(header.size);
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file->writeByte(header.version);
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file->writeUint16BE(header.width);
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file->writeUint16BE(header.height);
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file->writeByte(header.bpp);
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// TODO: for later this shouldn't be casted to uint16...
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uint16* pixels = (uint16 *)thumb.pixels;
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for (uint16 p = 0; p < thumb.w*thumb.h; ++p, ++pixels)
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file->writeUint16BE(*pixels);
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thumb.free();
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}
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} // end of namespace Scumm
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