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535 lines
20 KiB
C++
535 lines
20 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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* Multiple conversions for double-hi-res graphics.
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*/
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#include "StdAfx.h"
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#include "DoubleHiRes.h"
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#include "HiRes.h"
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/*
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* The screen layout is described in detail in Apple //e technote #3.
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*
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* Summary: pixel data is byte-interleaved between main and auxilliary
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* 8K pages. Seven pixels of each byte contribute to the image; the high
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* bit of each byte is ignored. There are 16 possible colors, which match
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* up with the 16 lo-res colors.
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*
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* The interference patterns caused by adjacent colors are extremely
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* difficult to model accurately, especially considering that RGB and
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* composite outputs seem to be different.
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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 ReformatDHR::Examine(ReformatHolder* pHolder)
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{
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ReformatHolder::ReformatApplies applies = ReformatHolder::kApplicNot;
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long fileLen = pHolder->GetSourceLen(ReformatHolder::kPartData);
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long fileType = pHolder->GetFileType();
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long auxType = pHolder->GetAuxType();
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long dhrAlg;
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bool relaxed;
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relaxed = pHolder->GetOption(ReformatHolder::kOptRelaxGfxTypeCheck) != 0;
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if ((fileType == kTypeFOT && auxType < 0x4000 && fileLen == 16384) ||
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(relaxed &&
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(
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(fileType == kTypeBIN && fileLen == 16376) ||
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(fileType == kTypeBIN && fileLen == 16380) ||
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(fileType == kTypeBIN && fileLen == 16384)
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)
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))
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{
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applies = ReformatHolder::kApplicProbably;
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}
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pHolder->SetApplic(ReformatHolder::kReformatDHR_Latched, applies,
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ReformatHolder::kApplicNot, ReformatHolder::kApplicNot);
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pHolder->SetApplic(ReformatHolder::kReformatDHR_BW, applies,
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ReformatHolder::kApplicNot, ReformatHolder::kApplicNot);
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pHolder->SetApplic(ReformatHolder::kReformatDHR_Plain140, applies,
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ReformatHolder::kApplicNot, ReformatHolder::kApplicNot);
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pHolder->SetApplic(ReformatHolder::kReformatDHR_Window, applies,
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ReformatHolder::kApplicNot, ReformatHolder::kApplicNot);
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/*
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* Set the "preferred" flag on one option.
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*/
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dhrAlg = pHolder->GetOption(ReformatHolder::kOptDHRAlgorithm);
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switch ((Algorithms) dhrAlg) {
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case kDHRLatched:
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pHolder->SetApplicPreferred(ReformatHolder::kReformatDHR_Latched);
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break;
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case kDHRBlackWhite:
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pHolder->SetApplicPreferred(ReformatHolder::kReformatDHR_BW);
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break;
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case kDHRPlain140:
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pHolder->SetApplicPreferred(ReformatHolder::kReformatDHR_Plain140);
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break;
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case kDHRWindow:
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pHolder->SetApplicPreferred(ReformatHolder::kReformatDHR_Window);
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break;
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default:
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LOGI("GLITCH: DHR algorithm %d not recognized", dhrAlg);
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break;
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}
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}
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/*
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* Convert a Double-Hi-Res image to a bitmap.
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*/
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int ReformatDHR::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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MyDIBitmap* pDib;
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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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switch (id) {
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case ReformatHolder::kReformatDHR_Latched:
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fAlgorithm = kDHRLatched;
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break;
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case ReformatHolder::kReformatDHR_BW:
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fAlgorithm = kDHRBlackWhite;
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break;
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case ReformatHolder::kReformatDHR_Plain140:
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fAlgorithm = kDHRPlain140;
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break;
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case ReformatHolder::kReformatDHR_Window:
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fAlgorithm = kDHRWindow;
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break;
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default:
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LOGI("GLITCH: bad id %d", id);
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fAlgorithm = kDHRLatched;
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break;
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}
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if (srcLen > kExpectedSize || srcLen < kExpectedSize-8) {
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LOGI(" DHR file is not ~%d bytes long (got %d)",
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kExpectedSize, srcLen);
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goto bail;
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}
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/* line layout is same as standard hires */
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ReformatHiRes::InitLineOffset(fLineOffset);
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InitColorLookup();
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pDib = DHRScreenToBitmap(srcBuf);
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if (pDib == NULL)
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goto bail;
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SetResultBuffer(pOutput, pDib);
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retval = 0;
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bail:
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return retval;
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}
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/*
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* Initialize the 4-bit-window color lookup table.
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*/
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void ReformatDHR::InitColorLookup(void)
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{
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for (int ii = 0; ii < 4; ii++) {
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for (int jj = 0; jj < kNumDHRColors; jj++) {
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int num = jj;
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for (int kk = 0; kk < ii; kk++) {
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if (num & 0x01)
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num |= 0x10;
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num >>= 1;
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num &= 0x0f;
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}
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fColorLookup[ii][jj] = num;
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}
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}
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return;
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}
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/*
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* Convert a buffer of double-hires data to a 16-color DIB.
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*/
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MyDIBitmap* ReformatDHR::DHRScreenToBitmap(const uint8_t* buf)
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{
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MyDIBitmap* pDib = new MyDIBitmap;
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uint8_t* outBuf;
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const int kMaxLook = 4; // padding to adjust for lookbehind/lookahead
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int pixelBits[kMaxLook+kPixelsPerLine+kMaxLook]; // 560 mono pixels
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unsigned int colorBuf[kOutputWidth]; // 560 color pixels
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int line;
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/* color map */
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enum {
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kColorBlack = 0, // 0000
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kColorRed, // 0001
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kColorBrown, // 0010
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kColorOrange, // 0011 hcolor=5
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kColorDarkGreen, // 0100
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kColorGrey1, // 0101
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kColorGreen, // 0110 hcolor=1
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kColorYellow, // 0111
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kColorDarkBlue, // 1000
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kColorPurple, // 1001 hcolor=2
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kColorGrey2, // 1010
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kColorPink, // 1011
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kColorMediumBlue, // 1100 hcolor=6
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kColorLightBlue, // 1101
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kColorAqua, // 1110
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kColorWhite, // 1110
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kNumColors
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};
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RGBQUAD colorConv[kNumColors];
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colorConv[0] = fPalette[kPaletteBlack];
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colorConv[1] = fPalette[kPaletteRed];
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colorConv[2] = fPalette[kPaletteBrown];
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colorConv[3] = fPalette[kPaletteOrange];
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colorConv[4] = fPalette[kPaletteDarkGreen];
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colorConv[5] = fPalette[kPaletteDarkGrey];
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colorConv[6] = fPalette[kPaletteGreen];
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colorConv[7] = fPalette[kPaletteYellow];
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colorConv[8] = fPalette[kPaletteDarkBlue];
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colorConv[9] = fPalette[kPalettePurple];
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colorConv[10] = fPalette[kPaletteLightGrey];
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colorConv[11] = fPalette[kPalettePink];
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colorConv[12] = fPalette[kPaletteMediumBlue];
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colorConv[13] = fPalette[kPaletteLightBlue];
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colorConv[14] = fPalette[kPaletteAqua];
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colorConv[15] = fPalette[kPaletteWhite];
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ASSERT(kNumColors == kPaletteSize);
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ASSERT(kNumDHRColors == kNumColors);
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ASSERT(kOutputWidth == kPixelsPerLine);
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if (pDib == NULL)
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goto bail;
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outBuf = (uint8_t*) pDib->Create(kOutputWidth, kOutputHeight,
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4, kNumColors);
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if (outBuf == NULL) {
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delete pDib;
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pDib = NULL;
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goto bail;
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}
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pDib->SetColorTable(colorConv);
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/*
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* Run through the lines.
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*
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* This is reasonably inefficient, since I'm splitting things into
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* their constituent bits and then, for the most part, just stuffing
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* them right back together. Someday, if fatally bored, this should
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* be optimized.
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*/
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for (line = 0; line < kNumLines; line++) {
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const uint8_t* lineData = buf + fLineOffset[line];
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int* bitPtr = pixelBits + kMaxLook;
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/* this is really just to clear the fore and aft MaxLook bits */
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memset(pixelBits, 0, sizeof(pixelBits));
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/* unravel the bits */
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for (int byt = 0; byt < kPixelsPerLine / 7; byt++) {
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uint8_t val;
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if (byt & 0x01) {
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/* odd pixels come from main memory */
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val = *(lineData+kPageSize);
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lineData++;
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} else {
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/* even pixels come from aux mem */
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val = *lineData;
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}
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for (int bit = 0; bit < 7; bit++) {
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*bitPtr++ = val & 0x01;
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val >>= 1;
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}
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}
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ASSERT(lineData <= buf + kPageSize);
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ASSERT((char*)bitPtr == (char*)pixelBits +
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sizeof(pixelBits) - kMaxLook*sizeof(pixelBits[0]));
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/*
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* Convert the bits to colors.
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*/
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int idx;
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if (fAlgorithm == kDHRBlackWhite) {
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for (idx = 0; idx < kPixelsPerLine; idx ++) {
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int bufTarget = idx;
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if (!pixelBits[idx]) {
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colorBuf[bufTarget] = kColorBlack;
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} else {
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colorBuf[bufTarget] = kColorWhite;
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}
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}
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} else if (fAlgorithm == kDHRPlain140) {
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/*
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* Very simple: every four pixels is a solid color. Not too
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* close to reality, but easy to implement.
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*/
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int pixVal = 0;
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bitPtr = pixelBits + kMaxLook;
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for (idx = 0; idx < kPixelsPerLine/4; idx++) {
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pixVal = *bitPtr++;
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pixVal = (pixVal << 1) | (*bitPtr++);
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pixVal = (pixVal << 1) | (*bitPtr++);
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pixVal = (pixVal << 1) | (*bitPtr++);
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colorBuf[idx*4] = pixVal;
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colorBuf[idx*4+1] = pixVal;
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colorBuf[idx*4+2] = pixVal;
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colorBuf[idx*4+3] = pixVal;
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}
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ASSERT(bitPtr == pixelBits + sizeof(pixelBits)/sizeof(pixelBits[0]) - kMaxLook);
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} else if (fAlgorithm == kDHRWindow) {
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/*
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* The way we determine the value of the color at pixel N
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* is by looking at the pixels at N-3, N-2, N-1, and N.
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*
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* We manage this with a continously shifting 4-bit-wide
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* window.
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*
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* Note to self: interesting case at line 87, pixels 200-240,
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* in "screen2".
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*/
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int pixVal = 0;
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bitPtr = pixelBits + kMaxLook;
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for (idx = 0; idx < kPixelsPerLine; idx++) {
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pixVal = (pixVal << 1) & 0x0f;
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if (*bitPtr++)
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pixVal |= 1;
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colorBuf[idx] = fColorLookup[(idx+1) & 0x03][pixVal];
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}
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ASSERT(bitPtr <= pixelBits + sizeof(pixelBits)/sizeof(pixelBits[0]));
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#if 0
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/*
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* Zero-stop pass, where we set the luminosity to zero if we
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* see four zeros in a row.
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*/
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bitPtr = pixelBits + kMaxLook;
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for (idx = 0; idx < kPixelsPerLine; idx++) {
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if (!bitPtr[idx] && !bitPtr[idx+1] &&
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!bitPtr[idx+2] && !bitPtr[idx+3])
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{
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//if (line == 87 && idx > 200 && idx < 240) {
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// LOGI(" %4d ERASE", idx);
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//}
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/*colorBuf[idx] =*/ colorBuf[idx+1] =
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colorBuf[idx+2] = /*colorBuf[idx+3] =*/ kColorBlack;
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}
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}
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#endif
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} else if (fAlgorithm == kDHRLatched) {
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/*
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* We determine the value of the color at pixel N is by looking
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* at the pixels at N-3, N-2, N-1, and N. When we see a color
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* transition, we also look at (N+1..N+4) to special-case
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* white/black transitions. This is necessary to reduce the
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* color fringes around sharply defined objects.
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*
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* Once a color is "latched", we keep outputting that color
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* until we find a new one that we like more.
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*
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* We manage this with a continously shifting 8-bit-wide window.
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*
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* Note to self: interesting case at line=98, pixels 50-80.
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*/
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unsigned int whole;
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int newColor, oldColor;
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bitPtr = pixelBits;
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whole = 0;
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for (idx = 0; idx < 8; idx++) {
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whole <<= 1;
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if (*bitPtr++)
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whole |= 1;
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}
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ASSERT((whole & (~0xff)) == 0);
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/* grab the color of the "previous" 4 pixels */
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oldColor = fColorLookup[idx & 0x03][whole & 0x0f];
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for (idx = 0; idx < kPixelsPerLine; idx++, bitPtr++) {
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//if (line == 98 && idx > 50 && idx < 80) {
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// if (!(idx % 4)) {
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// LOGI(" idx %3d: bits=0x%02x PPPPCNNN",
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// idx, whole & 0xff);
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// }
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//}
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/* shift another bit in, to give us 3 prev and 4 next */
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/* looks like PPPCNNNN */
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ASSERT(*bitPtr == 0 || *bitPtr == 1);
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whole = (whole << 1) | *bitPtr;
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whole &= 0xff; // not needed; useful for printfs
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/* get the new color (from PPPC bits) */
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newColor = fColorLookup[(idx+1) & 0x03][(whole & 0xf0) >> 4];
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//if (line == 98 && idx > 50 && idx < 80) {
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// LOGI(" idx %3d: old=%-2d new=%-2d (bits=0x%02x)", idx,
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// oldColor, newColor, whole & 0xff);
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//}
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if (newColor != oldColor) {
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/*
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* Transition to new color; check for white/black blocks
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* in *next* chunk of pixels. The goal is to eliminate
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* color fringes on white/black boundaries, which are the
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* most easily visible.
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*/
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int shift1, shift2, shift3;
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shift1 = (whole >> 3) & 0x0f; // PPCN
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shift2 = (whole >> 2) & 0x0f; // PCNN
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shift3 = (whole >> 1) & 0x0f; // CNNN
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if (shift1 == 0x0f || shift2 == 0x0f || shift3 == 0x0f)
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newColor = kColorWhite;
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else if (shift1 == 0 || shift2 == 0 || shift3 == 0)
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newColor = kColorBlack;
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//if (line == 98 && idx > 50 && idx < 80) {
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// LOGI(" idx %3d: S new=%-2d", idx, newColor);
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//}
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}
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//if (line == 98 && idx > 50 && idx < 80) {
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//newColor = kColorYellow;
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//}
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colorBuf[idx] = newColor;
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/*
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* Use the new color as the old color for the next iteration.
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* This is *NOT* the same as getting the color from PPPP
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* before shifting next round, because we might have
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* overridden white or black above. In that case, the new
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* color would be compared against white or black in the
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* transition check, instead of comparing against the actual
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* color of the PPPP pixels.
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*/
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oldColor = newColor; // latch it
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//oldColor = fColorLookup[idx & 0x03][whole & 0x0f];
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}
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ASSERT(bitPtr <= pixelBits + sizeof(pixelBits)/sizeof(pixelBits[0]));
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} else {
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ASSERT(false);
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#if defined(DHR_MULTIPASS)
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unsigned int colorBuf1[kMaxLook+kOutputWidth+kMaxLook];
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int pixVal = 0;
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bitPtr = pixelBits + kMaxLook;
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/*
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* Start simple.
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*/
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memset(colorBuf1, 0, sizeof(colorBuf1));
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for (idx = 0; idx < kPixelsPerLine/4; idx++) {
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pixVal = *bitPtr++;
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pixVal = (pixVal << 1) | (int)(*bitPtr++);
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pixVal = (pixVal << 1) | (int)(*bitPtr++);
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pixVal = (pixVal << 1) | (int)(*bitPtr++);
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colorBuf1[idx*4 +kMaxLook] = pixVal;
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colorBuf1[idx*4+1 +kMaxLook] = pixVal;
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colorBuf1[idx*4+2 +kMaxLook] = pixVal;
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colorBuf1[idx*4+3 +kMaxLook] = pixVal;
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}
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ASSERT(bitPtr <= pixelBits + sizeof(pixelBits)/sizeof(pixelBits[0]));
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/*
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* Now go back and patch all of the transitions between colors.
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* The most significant are transitions to and from black,
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* which have to truncate bits.
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*/
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for (idx = 3; idx < kMaxLook+kPixelsPerLine; idx += 4) {
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if (colorBuf1[idx] != colorBuf1[idx+1]) {
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/* color change */
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if (colorBuf1[idx] == 0) {
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/* trim pixels on left */
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pixVal = colorBuf1[idx+1];
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ASSERT(pixVal != 0);
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unsigned int* iptr = &colorBuf1[idx+1];
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while (!(pixVal & 0x08)) {
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*iptr++ = kColorBlack;
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pixVal <<= 1;
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}
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} else if (colorBuf1[idx+1] == 0) {
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/* trim pixels on right */
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pixVal = colorBuf1[idx];
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ASSERT(pixVal != 0);
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unsigned int* iptr = &colorBuf1[idx];
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while (!(pixVal & 0x01)) {
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*iptr-- = kColorBlack;
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pixVal >>= 1;
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}
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} else {
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/*
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* The center four pixels have a color determined
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* like this:
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*
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* orange = 0011
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* pink = 1011
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*
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* Take last two of orange and first two of pink,
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* and swap them so first two of pink come first,
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* e.g. 1011. The color, which also happens to be
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* pink, is what we set the middle four pixels to.
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*
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* Can't explain it, but that's how it works...
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* usually.
|
|
*/
|
|
uint8_t mergePix;
|
|
|
|
mergePix = colorBuf1[idx] & 0x03;
|
|
mergePix |= colorBuf1[idx+1] & 0x0c;
|
|
ASSERT((mergePix & 0xf0) == 0);
|
|
if (line == 191) {
|
|
LOGI("idx=0x%02x idx+1=0x%02x merge=0x%02x",
|
|
colorBuf1[idx], colorBuf1[idx+1], mergePix);
|
|
}
|
|
colorBuf1[idx-1] = colorBuf1[idx] = colorBuf1[idx+1] =
|
|
colorBuf1[idx+2] = mergePix;
|
|
}
|
|
}
|
|
}
|
|
memcpy(colorBuf, colorBuf1+kMaxLook, sizeof(colorBuf));
|
|
#endif
|
|
} /* color algorithm choices */
|
|
|
|
/* convert colors to 4-bit bitmap pixels, with line-doubling */
|
|
#define SetPix(x, y, twoval) \
|
|
outBuf[((kOutputHeight-1) - (y)) * (kOutputWidth/2) + (x)] = twoval
|
|
|
|
uint8_t pix4;
|
|
for (int pix = 0; pix < kPixelsPerLine/2; pix++) {
|
|
int bufPosn = pix * 2;
|
|
ASSERT(colorBuf[bufPosn] < kNumColors);
|
|
ASSERT(colorBuf[bufPosn+1] < kNumColors);
|
|
|
|
pix4 = colorBuf[bufPosn] << 4 | colorBuf[bufPosn+1];
|
|
SetPix(pix, line*2, pix4);
|
|
SetPix(pix, line*2+1, pix4);
|
|
}
|
|
} /*for each line*/
|
|
#undef SetPix
|
|
|
|
bail:
|
|
return pDib;
|
|
}
|