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https://github.com/fadden/ciderpress.git
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8f61f84585
Much of what the "reformat" code does involves processing data that is 8, 16, or 32 bits. We want to use size-specific types from stdint.h (e.g. uint16_t) rather than "unsigned short". This was a quick pass to replace the various "unsigned" declarations. More can be done here and elsewhere.
371 lines
10 KiB
C++
371 lines
10 KiB
C++
/*
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* CiderPress
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* Copyright (C) 2007 by faddenSoft, LLC. All Rights Reserved.
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* See the file LICENSE for distribution terms.
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*/
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/*
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* DreamGrafix super-hi-res conversions.
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*
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* Based on code provided by Jason Andersen.
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*/
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#include "StdAfx.h"
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#include "SuperHiRes.h"
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/*
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* ==========================================================================
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* ReformatDG256SHR
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* ==========================================================================
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*/
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/*
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* Decide whether or not we want to handle this file.
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*/
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void
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ReformatDG256SHR::Examine(ReformatHolder* pHolder)
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{
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ReformatHolder::ReformatApplies applies = ReformatHolder::kApplicNot;
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if (fDG.ScanDreamGrafix(pHolder) && fDG.fNumColors == 256)
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applies = ReformatHolder::kApplicYes;
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pHolder->SetApplic(ReformatHolder::kReformatSHR_DG256, applies,
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ReformatHolder::kApplicNot, ReformatHolder::kApplicNot);
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}
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/*
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* Convert a 256-color DreamGrafix Super Hi-Res Image.
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*/
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int
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ReformatDG256SHR::Process(const ReformatHolder* pHolder,
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ReformatHolder::ReformatID id, ReformatHolder::ReformatPart part,
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ReformatOutput* pOutput)
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{
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const uint8_t* srcBuf = pHolder->GetSourceBuf(part);
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long srcLen = pHolder->GetSourceLen(part);
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int retval = -1;
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if (fDG.UnpackDG(srcBuf, srcLen, &fScreen, NULL)) {
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MyDIBitmap* pDib = SHRScreenToBitmap8(&fScreen);
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if (pDib != NULL) {
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SetResultBuffer(pOutput, pDib);
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retval = 0;
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}
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}
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return retval;
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}
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/*
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* ==========================================================================
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* ReformatDG3200SHR
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* ==========================================================================
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*/
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/*
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* Decide whether or not we want to handle this file.
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*/
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void
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ReformatDG3200SHR::Examine(ReformatHolder* pHolder)
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{
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ReformatHolder::ReformatApplies applies = ReformatHolder::kApplicNot;
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if (fDG.ScanDreamGrafix(pHolder) && fDG.fNumColors == 3200)
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applies = ReformatHolder::kApplicYes;
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pHolder->SetApplic(ReformatHolder::kReformatSHR_DG3200, applies,
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ReformatHolder::kApplicNot, ReformatHolder::kApplicNot);
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}
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/*
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* Convert a 3200-color DreamGrafix Super Hi-Res Image.
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*/
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int
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ReformatDG3200SHR::Process(const ReformatHolder* pHolder,
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ReformatHolder::ReformatID id, ReformatHolder::ReformatPart part,
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ReformatOutput* pOutput)
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{
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const uint8_t* srcBuf = pHolder->GetSourceBuf(part);
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long srcLen = pHolder->GetSourceLen(part);
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int retval = -1;
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if (fDG.UnpackDG(srcBuf, srcLen, &fScreen, fExtColorTable)) {
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MyDIBitmap* pDib = SHR3200ToBitmap24();
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if (pDib != NULL) {
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SetResultBuffer(pOutput, pDib);
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retval = 0;
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}
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}
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return retval;
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}
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/*
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* ==========================================================================
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* ReformatDreamGrafix
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* ==========================================================================
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*/
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/*
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* Examine a DreamGrafix file. This figures out if its any of the
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* DreamGrafix formats, i.e. 256-color, 3200-color, packed, or unpacked.
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*/
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bool
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DreamGrafix::ScanDreamGrafix(ReformatHolder* pHolder)
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{
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long fileType = pHolder->GetFileType();
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long auxType = pHolder->GetAuxType();
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long fileLen = pHolder->GetSourceLen(ReformatHolder::kPartData);
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bool relaxed, couldBe;
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relaxed = pHolder->GetOption(ReformatHolder::kOptRelaxGfxTypeCheck) != 0;
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couldBe = false;
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if (fileType == Reformat::kTypePNT && auxType == 0x8005)
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couldBe = true; // $c0/8005 DG packed
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else if (fileType == Reformat::kTypePIC && auxType == 0x8003)
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couldBe = false; // $c1/8003 DG unpacked -- not supported
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else if (relaxed) {
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if (fileType == Reformat::kTypeBIN && auxType == 0x8005)
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couldBe = true;
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}
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if (fileLen < 256)
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couldBe = false;
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if (!couldBe)
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return false;
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const uint8_t* ptr;
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ptr = pHolder->GetSourceBuf(ReformatHolder::kPartData)
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+ fileLen - kHeaderOffset;
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if (memcmp(ptr+6, "\x0a""DreamWorld", 11) != 0)
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return false;
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fNumColors = (*ptr == 0) ? 256 : 3200;
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fHeight = Reformat::Get16LE(ptr + 2);
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fWidth = Reformat::Get16LE(ptr + 4);
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if (fWidth != 320 || fHeight != 200) {
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LOGI("ODD: strange height %dx%x in DG", fWidth, fHeight);
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return false;
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}
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return true;
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}
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/*
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* Unpack a DreamGrafix SHR image compressed with LZW.
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*
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* Returns true on success, false if the uncompress step failed to produce
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* exactly 32768+32*200 bytes.
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*/
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bool
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DreamGrafix::UnpackDG(const uint8_t* srcBuf, long srcLen,
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ReformatSHR::SHRScreen* pScreen, uint8_t* extColorTable)
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{
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int expectedLen;
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uint8_t* tmpBuf;
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int actual;
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if (extColorTable == NULL) {
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/*
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* 32000 for pixels (320*200*0.5 bytes)
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* 256 for SCB (200 + 56 unused)
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* 512 for basic palette (16 sets * 16 colors * 2 bytes)\
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* 512 optional/unused?
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*/
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expectedLen = 33280;
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} else {
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/*
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* 32000 for pixels (320*200*0.5 bytes)
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* 6400 for palette (200 lines * 16 entries * 2 bytes)
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* 512 optional/unused?
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*/
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expectedLen = 38912;
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}
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/* over-alloc -- our LZW decoder doesn't check often */
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tmpBuf = new uint8_t[expectedLen + 1024];
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if (tmpBuf == NULL)
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return false;
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actual = UnpackLZW(srcBuf, srcLen, tmpBuf, expectedLen);
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if (actual != expectedLen && actual != (expectedLen-512)) {
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LOGI("UnpackLZW expected %d, got %d", expectedLen, actual);
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delete[] tmpBuf;
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return false;
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}
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memcpy(pScreen->pixels, tmpBuf, 32000);
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if (extColorTable == NULL) {
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memcpy(pScreen->scb, tmpBuf + 32000, 256);
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memcpy(pScreen->colorTable, tmpBuf + 32256, 512);
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} else {
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const uint16_t* pSrcTable;
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uint16_t* pDstTable;
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pSrcTable = (const uint16_t*) (tmpBuf + 32000);
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pDstTable = (uint16_t*) extColorTable;
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int table;
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for (table = 0; table < ReformatSHR::kNumLines; table++) {
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int entry;
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for (entry = 0; entry < ReformatSHR::kNumEntriesPerColorTable; entry++) {
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pDstTable[(ReformatSHR::kNumEntriesPerColorTable-1) - entry] =
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*pSrcTable++;
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}
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pDstTable += ReformatSHR::kNumEntriesPerColorTable;
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}
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}
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delete[] tmpBuf;
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return true;
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}
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/*
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* Constants for LZW.
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*/
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static const int kClearCode = 256;
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static const int kEofCode = 257;
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static const int kFirstFreeCode = 258;
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static const unsigned int bitMasks[] = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0x1ff, 0x3ff, 0x7ff, 0xfff
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};
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/* initialize the table */
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#define INIT_TABLE() { \
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nBitMod1 = 9; \
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nBitMask = bitMasks[nBitMod1]; \
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maxCode = 1 << nBitMod1; \
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freeCode = kFirstFreeCode; \
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};
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/* add a new code to our data structure */
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#define ADD_CODE() { \
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hashChar[freeCode] = k; \
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hashNext[freeCode] = oldCode; \
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freeCode++; \
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};
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/* read the next code and put the value into iCode */
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#define READ_CODE() { \
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int bit_idx = bitOffset & 0x7; \
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int byte_idx = bitOffset >> 3; \
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\
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iCode = srcBuf[ byte_idx ]; \
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iCode &= 0xFF; \
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iCode |= (srcBuf[ byte_idx+1 ]<<8); \
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iCode &= 0xFFFF; \
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iCode |= (srcBuf[ byte_idx+2 ]<<16); \
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iCode >>= bit_idx; \
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iCode &= nBitMask; \
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bitOffset += nBitMod1; \
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};
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/*static*/ int
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DreamGrafix::UnpackLZW(const uint8_t* srcBuf, long srcLen,
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uint8_t* dstBuf, long dstLen)
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{
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uint16_t finChar, oldCode, inCode, freeCode, maxCode, k;
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uint16_t nBitMod1, nBitMask;
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int bitOffset;
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uint16_t hashNext[4096];
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uint16_t hashChar[4096];
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uint8_t* pOrigDst = dstBuf;
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int iCode;
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uint16_t stack[32768];
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int stackIdx = 0;
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/* initialize table and code reader */
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INIT_TABLE();
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bitOffset = 0;
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while (true) {
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if (dstBuf - pOrigDst > dstLen) {
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LOGI("LZW overrun");
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return -1;
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}
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int A;
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int Y;
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READ_CODE();
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if (iCode == kEofCode) {
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break;
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}
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if (iCode == kClearCode) {
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// Got Clear
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INIT_TABLE();
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READ_CODE();
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oldCode = iCode;
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k = iCode;
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finChar = iCode;
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*dstBuf++ = (uint8_t) iCode;
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continue;
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}
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A = inCode = iCode;
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if (iCode < freeCode) {
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goto inTable;
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}
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stack[stackIdx] = finChar;
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stackIdx++;
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A = oldCode;
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inTable:
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if (A < 256) {
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goto gotChar;
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}
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while (A >= 256) {
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Y = A;
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A = hashChar[Y];
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stack[stackIdx] = A;
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stackIdx++;
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A = hashNext[Y];
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}
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gotChar:
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A &= 0xFF;
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finChar = A;
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k = A;
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Y = 0;
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dstBuf[Y++] = A;
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while (stackIdx) {
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stackIdx--;
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A = stack[stackIdx];
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dstBuf[Y++] = A;
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}
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dstBuf += Y;
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ADD_CODE();
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oldCode = inCode;
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if (freeCode < maxCode) {
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continue; // goto nextCode;
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}
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if (12 == nBitMod1) {
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continue; // goto nextCode;
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}
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nBitMod1++;
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nBitMask = bitMasks[nBitMod1];
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//printf("nBitMod1 = %d, nBitMask = %04x\n",
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// nBitMod1, nBitMask);
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maxCode <<= 1;
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}
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return dstBuf - pOrigDst;
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}
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