From 738160d17a551505f4b234dcad0d146a60f21c61 Mon Sep 17 00:00:00 2001 From: Greg Frieger Date: Wed, 11 Mar 2009 00:23:18 +0000 Subject: Some clean-up of DecompressorComp3 class svn-id: r39323 --- engines/sci/scicore/decompressor.cpp | 199 ++++++++++++++++------------------- 1 file changed, 88 insertions(+), 111 deletions(-) (limited to 'engines/sci/scicore/decompressor.cpp') diff --git a/engines/sci/scicore/decompressor.cpp b/engines/sci/scicore/decompressor.cpp index 5afa5dfe34..62ccd0ffbd 100644 --- a/engines/sci/scicore/decompressor.cpp +++ b/engines/sci/scicore/decompressor.cpp @@ -35,18 +35,20 @@ namespace Sci { int Decompressor::unpack(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked, uint32 nUnpacked) { - init(src, dest, nPacked, nUnpacked); + return copyBytes(src, dest, nPacked); +} + +int Decompressor::copyBytes(Common::ReadStream *src, Common::WriteStream *dest, uint32 nSize) { byte buff[1024]; uint32 chunk; - while (_szPacked && !_src->ioFailed() && !_dest->ioFailed()) { - chunk = MIN(1024, _szPacked); - _src->read(buff, chunk); - _dest->write(buff, chunk); - _szPacked -= chunk; + while (nSize && !src->ioFailed() && !dest->ioFailed()) { + chunk = MIN(1024, nSize); + src->read(buff, chunk); + dest->write(buff, chunk); + nSize -= chunk; } - return _src->ioFailed() || _dest->ioFailed() ? 1 : 0; + return src->ioFailed() || dest->ioFailed() ? 1 : 0; } - void Decompressor::init(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked, uint32 nUnpacked) { _src = src; @@ -147,6 +149,7 @@ int DecompressorComp3::unpack(Common::ReadStream *src, Common::WriteStream *dest byte *buffer = NULL; byte *buffer2 = NULL; Common::MemoryWriteStream *pBuff = NULL; + Common::MemoryReadStream *pBuffIn = NULL; switch (_compression) { case kComp3: // Comp3 compression @@ -155,16 +158,21 @@ int DecompressorComp3::unpack(Common::ReadStream *src, Common::WriteStream *dest case kComp3View: case kComp3Pic: buffer = new byte[nUnpacked]; - buffer2 = new byte[nUnpacked]; pBuff = new Common::MemoryWriteStream(buffer, nUnpacked); doUnpack(src, pBuff, nPacked, nUnpacked); - if (_compression == kComp3View) + if (_compression == kComp3View) { + buffer2 = new byte[nUnpacked]; view_reorder(buffer, buffer2); - else - pic_reorder(buffer, buffer2, nUnpacked); - dest->write(buffer2, nUnpacked); + dest->write(buffer2, nUnpacked); + } + else { + pBuffIn = new Common::MemoryReadStream(buffer, nUnpacked); + reorderPic(pBuffIn, dest, nUnpacked); + } delete[] buffer2; delete[] buffer; + delete pBuff; + delete pBuffIn; break; } return 0; @@ -243,36 +251,32 @@ int DecompressorComp3::doUnpack(Common::ReadStream *src, Common::WriteStream *de return _dwWrote ? 0 : 1; } -enum { - PIC_OP_SET_COLOR = 0xf0, - PIC_OP_DISABLE_VISUAL = 0xf1, - PIC_OP_SET_PRIORITY = 0xf2, - PIC_OP_DISABLE_PRIORITY = 0xf3, - PIC_OP_SHORT_PATTERNS = 0xf4, - PIC_OP_MEDIUM_LINES = 0xf5, - PIC_OP_LONG_LINES = 0xf6, - PIC_OP_SHORT_LINES = 0xf7, - PIC_OP_FILL = 0xf8, - PIC_OP_SET_PATTERN = 0xf9, - PIC_OP_ABSOLUTE_PATTERN = 0xfa, - PIC_OP_SET_CONTROL = 0xfb, - PIC_OP_DISABLE_CONTROL = 0xfc, - PIC_OP_MEDIUM_PATTERNS = 0xfd, - PIC_OP_OPX = 0xfe, - PIC_OP_TERMINATE = 0xff -}; - -enum { - PIC_OPX_SET_PALETTE_ENTRIES = 0, - PIC_OPX_EMBEDDED_VIEW = 1, - PIC_OPX_SET_PALETTE = 2, - PIC_OPX_PRIORITY_TABLE_EQDIST = 3, - PIC_OPX_PRIORITY_TABLE_EXPLICIT = 4 -}; - #define PAL_SIZE 1284 -#define CEL_HEADER_SIZE 7 #define EXTRA_MAGIC_SIZE 15 +#define VIEW_HEADER_COLORS_8BIT 0x80 + +void DecompressorComp3::decodeRLE(Common::ReadStream *src, Common::WriteStream *dest, byte *pixeldata, uint16 size) { + int pos = 0; + byte nextbyte; + while (pos < size) { + nextbyte = src->readByte(); + dest->writeByte(nextbyte); + pos ++; + switch (nextbyte & 0xC0) { + case 0x40 : + case 0x00 : + dest->write(pixeldata, nextbyte); + pixeldata += nextbyte; + pos += nextbyte; + break; + case 0xC0 : + break; + case 0x80 : + dest->writeByte(*pixeldata++); + break; + } + } +} void DecompressorComp3::decode_rle(byte **rledata, byte **pixeldata, byte *outbuffer, int size) { int pos = 0; @@ -339,80 +343,53 @@ int DecompressorComp3::rle_size(byte *rledata, int dsize) { return size; } -void DecompressorComp3::pic_reorder(byte *inbuffer, byte *outbuffer, int dsize) { - int view_size; - int view_start; - int cdata_size; - int i; - byte *seeker = inbuffer; - byte *writer; - char viewdata[CEL_HEADER_SIZE]; - byte *cdata, *cdata_start; +void DecompressorComp3::reorderPic(Common::ReadStream *src, Common::WriteStream *dest, int dsize) { + int view_size, view_start, cdata_size; + byte viewdata[7]; + byte *cdata = NULL; + byte *extra = NULL; - writer = outbuffer; - - *writer++ = PIC_OP_OPX; - *writer++ = PIC_OPX_SET_PALETTE; - - for (i = 0; i < 256; i++) /* Palette translation map */ - *writer++ = i; - - WRITE_LE_UINT16(writer, 0); /* Palette stamp */ - writer += 2; - WRITE_LE_UINT16(writer, 0); - writer += 2; - - view_size = READ_LE_UINT16(seeker); - seeker += 2; - view_start = READ_LE_UINT16(seeker); - seeker += 2; - cdata_size = READ_LE_UINT16(seeker); - seeker += 2; - - memcpy(viewdata, seeker, sizeof(viewdata)); - seeker += sizeof(viewdata); - - memcpy(writer, seeker, 4*256); /* Palette */ - seeker += 4*256; - writer += 4*256; - - if (view_start != PAL_SIZE + 2) { /* +2 for the opcode */ - memcpy(writer, seeker, view_start-PAL_SIZE-2); - seeker += view_start - PAL_SIZE - 2; - writer += view_start - PAL_SIZE - 2; - } - - if (dsize != view_start+EXTRA_MAGIC_SIZE+view_size) { - memcpy(outbuffer+view_size+view_start+EXTRA_MAGIC_SIZE, seeker, - dsize-view_size-view_start-EXTRA_MAGIC_SIZE); - seeker += dsize-view_size-view_start-EXTRA_MAGIC_SIZE; + // Setting palette + dest->writeByte(PIC_OP_OPX); + dest->writeByte(PIC_OPX_SET_PALETTE); + + for (int i = 0; i < 256; i++) // Palette translation map + dest->writeByte(i); + dest->writeUint32LE(0); //Palette timestamp + + view_size = src->readUint16LE(); + view_start = src->readUint16LE(); + cdata_size = src->readUint16LE(); + src->read(viewdata, sizeof(viewdata)); + // Copy palette colors + copyBytes(src, dest, 1024); + // copy drawing opcodes + if (view_start != PAL_SIZE + 2) + copyBytes(src, dest, view_start - PAL_SIZE - 2); + // storing extra opcodes to be pasted after the cel + if (dsize != view_start + EXTRA_MAGIC_SIZE + view_size) { + extra = new byte[dsize - view_size - view_start - EXTRA_MAGIC_SIZE]; + src->read(extra, dsize - view_size - view_start - EXTRA_MAGIC_SIZE); } - - cdata_start = cdata = (byte *)malloc(cdata_size); - memcpy(cdata, seeker, cdata_size); - seeker += cdata_size; - - writer = outbuffer + view_start; - *writer++ = PIC_OP_OPX; - *writer++ = PIC_OPX_EMBEDDED_VIEW; - *writer++ = 0; - *writer++ = 0; - *writer++ = 0; - WRITE_LE_UINT16(writer, view_size + 8); - writer += 2; - - memcpy(writer, viewdata, sizeof(viewdata)); - writer += sizeof(viewdata); - - *writer++ = 0; - - decode_rle(&seeker, &cdata, writer, view_size); - - free(cdata_start); + // Writing picture cel opcode and header + dest->writeByte(PIC_OP_OPX); + dest->writeByte(PIC_OPX_EMBEDDED_VIEW); + dest->writeByte(0); + dest->writeUint16LE(0); + dest->writeUint16LE(view_size + 8); + dest->write(viewdata, sizeof(viewdata)); + dest->writeByte(0); + // Unpacking RLE cel data + cdata = new byte[cdata_size]; + src->read(cdata, cdata_size); + decodeRLE(src, dest, cdata, view_size); + // writing stored extra opcodes + if (extra) + dest->write(extra, dsize - view_size - view_start - EXTRA_MAGIC_SIZE); + delete[] extra; + delete[] cdata; } -#define VIEW_HEADER_COLORS_8BIT 0x80 - void DecompressorComp3::build_cel_headers(byte **seeker, byte **writer, int celindex, int *cc_lengths, int max) { for (int c = 0; c < max; c++) { memcpy(*writer, *seeker, 6); -- cgit v1.2.3