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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 "common/iff_container.h"
#include "common/stream.h"
#include "common/util.h"
#include "graphics/decoders/iff.h"
namespace Graphics {
IFFDecoder::IFFDecoder() {
_surface = 0;
_palette = 0;
destroy();
}
IFFDecoder::~IFFDecoder() {
destroy();
}
void IFFDecoder::destroy() {
if (_surface) {
_surface->free();
delete _surface;
_surface = 0;
}
if (_palette) {
delete[] _palette;
_palette = 0;
}
memset(&_header, 0, sizeof(Header));
_paletteRanges.clear();
_type = TYPE_UNKNOWN;
_paletteColorCount = 0;
_numRelevantPlanes = 8;
_pixelPacking = false;
}
bool IFFDecoder::loadStream(Common::SeekableReadStream &stream) {
destroy();
const uint32 form = stream.readUint32BE();
if (form != ID_FORM) {
warning("Failed reading IFF-file");
return false;
}
stream.skip(4);
const uint32 type = stream.readUint32BE();
switch (type) {
case ID_ILBM:
_type = TYPE_ILBM;
break;
case ID_PBM:
_type = TYPE_PBM;
break;
}
if (type == TYPE_UNKNOWN) {
warning("Failed reading IFF-file");
return false;
}
while (1) {
const uint32 chunkType = stream.readUint32BE();
const uint32 chunkSize = stream.readUint32BE();
if (stream.eos())
break;
switch (chunkType) {
case ID_BMHD:
loadHeader(stream);
break;
case ID_CMAP:
loadPalette(stream, chunkSize);
break;
case ID_CRNG:
loadPaletteRange(stream, chunkSize);
break;
case ID_BODY:
loadBitmap(stream);
break;
default:
stream.skip(chunkSize);
}
}
return true;
}
void IFFDecoder::loadHeader(Common::SeekableReadStream &stream) {
_header.width = stream.readUint16BE();
_header.height = stream.readUint16BE();
_header.x = stream.readUint16BE();
_header.y = stream.readUint16BE();
_header.numPlanes = stream.readByte();
_header.masking = stream.readByte();
_header.compression = stream.readByte();
_header.flags = stream.readByte();
_header.transparentColor = stream.readUint16BE();
_header.xAspect = stream.readByte();
_header.yAspect = stream.readByte();
_header.pageWidth = stream.readUint16BE();
_header.pageHeight = stream.readUint16BE();
assert(_header.width >= 1);
assert(_header.height >= 1);
assert(_header.numPlanes >= 1 && _header.numPlanes <= 8 && _header.numPlanes != 7);
}
void IFFDecoder::loadPalette(Common::SeekableReadStream &stream, const uint32 size) {
_palette = new byte[size];
stream.read(_palette, size);
_paletteColorCount = size / 3;
}
void IFFDecoder::loadPaletteRange(Common::SeekableReadStream &stream, const uint32 size) {
PaletteRange range;
range.timer = stream.readSint16BE();
range.step = stream.readSint16BE();
range.flags = stream.readSint16BE();
range.first = stream.readByte();
range.last = stream.readByte();
_paletteRanges.push_back(range);
}
void IFFDecoder::loadBitmap(Common::SeekableReadStream &stream) {
_numRelevantPlanes = MIN(_numRelevantPlanes, _header.numPlanes);
if (_numRelevantPlanes != 1 && _numRelevantPlanes != 2 && _numRelevantPlanes != 4)
_pixelPacking = false;
uint16 outPitch = _header.width;
if (_pixelPacking)
outPitch /= (8 / _numRelevantPlanes);
// FIXME: CLUT8 is not a proper format for packed bitmaps but there is no way to tell it to use 1, 2 or 4 bits per pixel
_surface = new Graphics::Surface();
_surface->create(outPitch, _header.height, Graphics::PixelFormat::createFormatCLUT8());
if (_type == TYPE_ILBM) {
uint32 scanlinePitch = ((_header.width + 15) >> 4) << 1;
byte *scanlines = new byte[scanlinePitch * _header.numPlanes];
byte *data = (byte *)_surface->getBasePtr(0, 0);
for (uint16 i = 0; i < _header.height; ++i) {
byte *scanline = scanlines;
for (uint16 j = 0; j < _header.numPlanes; ++j) {
uint16 outSize = scanlinePitch;
if (_header.compression) {
Common::PackBitsReadStream packStream(stream);
packStream.read(scanline, outSize);
} else {
stream.read(scanline, outSize);
}
scanline += outSize;
}
packPixels(scanlines, data, scanlinePitch, outPitch);
data += outPitch;
}
delete[] scanlines;
} else if (_type == TYPE_PBM) {
byte *data = (byte *)_surface->getBasePtr(0, 0);
uint32 outSize = _header.width * _header.height;
if (_header.compression) {
Common::PackBitsReadStream packStream(stream);
packStream.read(data, outSize);
} else {
stream.read(data, outSize);
}
}
}
void IFFDecoder::packPixels(byte *scanlines, byte *data, const uint16 scanlinePitch, const uint16 outPitch) {
uint32 numPixels = _header.width;
if (_pixelPacking)
numPixels = outPitch * (8 / _numRelevantPlanes);
for (uint32 x = 0; x < numPixels; ++x) {
byte *scanline = scanlines;
byte pixel = 0;
byte offset = x >> 3;
byte bit = 0x80 >> (x & 7);
// first build a pixel by scanning all the usable planes in the input
for (uint32 plane = 0; plane < _numRelevantPlanes; ++plane) {
if (scanline[offset] & bit)
pixel |= (1 << plane);
scanline += scanlinePitch;
}
// then output the pixel according to the requested packing
if (!_pixelPacking)
data[x] = pixel;
else if (_numRelevantPlanes == 1)
data[x / 8] |= (pixel << (x & 7));
else if (_numRelevantPlanes == 2)
data[x / 4] |= (pixel << ((x & 3) << 1));
else if (_numRelevantPlanes == 4)
data[x / 2] |= (pixel << ((x & 1) << 2));
}
}
} // End of namespace Graphics
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