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Diffstat (limited to 'graphics/decoders/iff.cpp')
| -rw-r--r-- | graphics/decoders/iff.cpp | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/graphics/decoders/iff.cpp b/graphics/decoders/iff.cpp new file mode 100644 index 0000000000..50c7b4f7de --- /dev/null +++ b/graphics/decoders/iff.cpp @@ -0,0 +1,241 @@ +/* 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->pixels; + + 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->pixels; + 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 |