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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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "graphics/thumbnail.h"
#include "graphics/scaler.h"
#include "graphics/colormasks.h"
#include "common/endian.h"
#include "common/system.h"
#include "common/stream.h"
#include "common/textconsole.h"
namespace Graphics {
namespace {
#define THMB_VERSION 2
struct ThumbnailHeader {
uint32 type;
uint32 size;
byte version;
uint16 width, height;
PixelFormat format;
};
#define ThumbnailHeaderSize (4+4+1+2+2+(1+4+4))
bool loadHeader(Common::SeekableReadStream &in, ThumbnailHeader &header, bool outputWarnings) {
header.type = in.readUint32BE();
// 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 != MKTAG('T','H','M','B') && header.type != MKTAG('B','M','H','T')) {
if (outputWarnings)
warning("couldn't find thumbnail header type");
return false;
}
header.size = in.readUint32BE();
header.version = in.readByte();
if (header.version > THMB_VERSION) {
if (outputWarnings)
warning("trying to load a newer thumbnail version: %d instead of %d", header.version, THMB_VERSION);
return false;
}
header.width = in.readUint16BE();
header.height = in.readUint16BE();
header.format.bytesPerPixel = in.readByte();
// Starting from version 2 on we serialize the whole PixelFormat.
if (header.version >= 2) {
header.format.rLoss = in.readByte();
header.format.gLoss = in.readByte();
header.format.bLoss = in.readByte();
header.format.aLoss = in.readByte();
header.format.rShift = in.readByte();
header.format.gShift = in.readByte();
header.format.bShift = in.readByte();
header.format.aShift = in.readByte();
} else {
// Version 1 used a hardcoded RGB565.
header.format = createPixelFormat<565>();
}
return true;
}
} // end of anonymous namespace
bool checkThumbnailHeader(Common::SeekableReadStream &in) {
uint32 position = in.pos();
ThumbnailHeader header;
bool hasHeader = loadHeader(in, header, false);
in.seek(position, SEEK_SET);
return hasHeader;
}
bool skipThumbnail(Common::SeekableReadStream &in) {
uint32 position = in.pos();
ThumbnailHeader header;
if (!loadHeader(in, header, false)) {
in.seek(position, SEEK_SET);
return false;
}
in.seek(header.size - (in.pos() - position), SEEK_CUR);
return true;
}
Graphics::Surface *loadThumbnail(Common::SeekableReadStream &in) {
ThumbnailHeader header;
if (!loadHeader(in, header, true))
return 0;
if (header.format.bytesPerPixel != 2 && header.format.bytesPerPixel != 4) {
warning("trying to load thumbnail with unsupported bit depth %d", header.format.bytesPerPixel);
return 0;
}
Graphics::Surface *const to = new Graphics::Surface();
to->create(header.width, header.height, header.format);
for (int y = 0; y < to->h; ++y) {
switch (header.format.bytesPerPixel) {
case 2: {
uint16 *pixels = (uint16 *)to->getBasePtr(0, y);
for (uint x = 0; x < to->w; ++x) {
*pixels++ = in.readUint16BE();
}
} break;
case 4: {
uint32 *pixels = (uint32 *)to->getBasePtr(0, y);
for (uint x = 0; x < to->w; ++x) {
*pixels++ = in.readUint32BE();
}
} break;
default:
assert(0);
}
}
return to;
}
bool saveThumbnail(Common::WriteStream &out) {
Graphics::Surface thumb;
if (!createThumbnailFromScreen(&thumb)) {
warning("Couldn't create thumbnail from screen, aborting thumbnail save");
return false;
}
bool success = saveThumbnail(out, thumb);
thumb.free();
return success;
}
bool saveThumbnail(Common::WriteStream &out, const Graphics::Surface &thumb) {
if (thumb.format.bytesPerPixel != 2 && thumb.format.bytesPerPixel != 4) {
warning("trying to save thumbnail with bpp %u", thumb.format.bytesPerPixel);
return false;
}
ThumbnailHeader header;
header.type = MKTAG('T','H','M','B');
header.size = ThumbnailHeaderSize + thumb.w*thumb.h*thumb.format.bytesPerPixel;
header.version = THMB_VERSION;
header.width = thumb.w;
header.height = thumb.h;
out.writeUint32BE(header.type);
out.writeUint32BE(header.size);
out.writeByte(header.version);
out.writeUint16BE(header.width);
out.writeUint16BE(header.height);
// Serialize the PixelFormat
out.writeByte(thumb.format.bytesPerPixel);
out.writeByte(thumb.format.rLoss);
out.writeByte(thumb.format.gLoss);
out.writeByte(thumb.format.bLoss);
out.writeByte(thumb.format.aLoss);
out.writeByte(thumb.format.rShift);
out.writeByte(thumb.format.gShift);
out.writeByte(thumb.format.bShift);
out.writeByte(thumb.format.aShift);
// Serialize the pixel data
for (uint y = 0; y < thumb.h; ++y) {
switch (thumb.format.bytesPerPixel) {
case 2: {
const uint16 *pixels = (const uint16 *)thumb.getBasePtr(0, y);
for (uint x = 0; x < thumb.w; ++x) {
out.writeUint16BE(*pixels++);
}
} break;
case 4: {
const uint32 *pixels = (const uint32 *)thumb.getBasePtr(0, y);
for (uint x = 0; x < thumb.w; ++x) {
out.writeUint32BE(*pixels++);
}
} break;
default:
assert(0);
}
}
return true;
}
} // End of namespace Graphics
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