mirror of
https://github.com/fadden/ciderpress.git
synced 2024-11-29 20:49:27 +00:00
535 lines
20 KiB
C++
535 lines
20 KiB
C++
/*
|
|
* CiderPress
|
|
* Copyright (C) 2007 by faddenSoft, LLC. All Rights Reserved.
|
|
* See the file LICENSE for distribution terms.
|
|
*/
|
|
/*
|
|
* Multiple conversions for double-hi-res graphics.
|
|
*/
|
|
#include "StdAfx.h"
|
|
#include "DoubleHiRes.h"
|
|
#include "HiRes.h"
|
|
|
|
/*
|
|
* The screen layout is described in detail in Apple //e technote #3.
|
|
*
|
|
* Summary: pixel data is byte-interleaved between main and auxilliary
|
|
* 8K pages. Seven pixels of each byte contribute to the image; the high
|
|
* bit of each byte is ignored. There are 16 possible colors, which match
|
|
* up with the 16 lo-res colors.
|
|
*
|
|
* The interference patterns caused by adjacent colors are extremely
|
|
* difficult to model accurately, especially considering that RGB and
|
|
* composite outputs seem to be different.
|
|
*/
|
|
|
|
/*
|
|
* Decide whether or not we want to handle this file.
|
|
*/
|
|
void ReformatDHR::Examine(ReformatHolder* pHolder)
|
|
{
|
|
ReformatHolder::ReformatApplies applies = ReformatHolder::kApplicNot;
|
|
long fileLen = pHolder->GetSourceLen(ReformatHolder::kPartData);
|
|
long fileType = pHolder->GetFileType();
|
|
long auxType = pHolder->GetAuxType();
|
|
long dhrAlg;
|
|
bool relaxed;
|
|
|
|
relaxed = pHolder->GetOption(ReformatHolder::kOptRelaxGfxTypeCheck) != 0;
|
|
|
|
if ((fileType == kTypeFOT && auxType < 0x4000 && fileLen == 16384) ||
|
|
(relaxed &&
|
|
(
|
|
(fileType == kTypeBIN && fileLen == 16376) ||
|
|
(fileType == kTypeBIN && fileLen == 16380) ||
|
|
(fileType == kTypeBIN && fileLen == 16384)
|
|
)
|
|
))
|
|
{
|
|
applies = ReformatHolder::kApplicProbably;
|
|
}
|
|
|
|
pHolder->SetApplic(ReformatHolder::kReformatDHR_Latched, applies,
|
|
ReformatHolder::kApplicNot, ReformatHolder::kApplicNot);
|
|
pHolder->SetApplic(ReformatHolder::kReformatDHR_BW, applies,
|
|
ReformatHolder::kApplicNot, ReformatHolder::kApplicNot);
|
|
pHolder->SetApplic(ReformatHolder::kReformatDHR_Plain140, applies,
|
|
ReformatHolder::kApplicNot, ReformatHolder::kApplicNot);
|
|
pHolder->SetApplic(ReformatHolder::kReformatDHR_Window, applies,
|
|
ReformatHolder::kApplicNot, ReformatHolder::kApplicNot);
|
|
|
|
/*
|
|
* Set the "preferred" flag on one option.
|
|
*/
|
|
dhrAlg = pHolder->GetOption(ReformatHolder::kOptDHRAlgorithm);
|
|
|
|
switch ((Algorithms) dhrAlg) {
|
|
case kDHRLatched:
|
|
pHolder->SetApplicPreferred(ReformatHolder::kReformatDHR_Latched);
|
|
break;
|
|
case kDHRBlackWhite:
|
|
pHolder->SetApplicPreferred(ReformatHolder::kReformatDHR_BW);
|
|
break;
|
|
case kDHRPlain140:
|
|
pHolder->SetApplicPreferred(ReformatHolder::kReformatDHR_Plain140);
|
|
break;
|
|
case kDHRWindow:
|
|
pHolder->SetApplicPreferred(ReformatHolder::kReformatDHR_Window);
|
|
break;
|
|
default:
|
|
LOGI("GLITCH: DHR algorithm %d not recognized", dhrAlg);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Convert a Double-Hi-Res image to a bitmap.
|
|
*/
|
|
int ReformatDHR::Process(const ReformatHolder* pHolder,
|
|
ReformatHolder::ReformatID id, ReformatHolder::ReformatPart part,
|
|
ReformatOutput* pOutput)
|
|
{
|
|
MyDIBitmap* pDib;
|
|
const uint8_t* srcBuf = pHolder->GetSourceBuf(part);
|
|
long srcLen = pHolder->GetSourceLen(part);
|
|
int retval = -1;
|
|
|
|
switch (id) {
|
|
case ReformatHolder::kReformatDHR_Latched:
|
|
fAlgorithm = kDHRLatched;
|
|
break;
|
|
case ReformatHolder::kReformatDHR_BW:
|
|
fAlgorithm = kDHRBlackWhite;
|
|
break;
|
|
case ReformatHolder::kReformatDHR_Plain140:
|
|
fAlgorithm = kDHRPlain140;
|
|
break;
|
|
case ReformatHolder::kReformatDHR_Window:
|
|
fAlgorithm = kDHRWindow;
|
|
break;
|
|
default:
|
|
LOGI("GLITCH: bad id %d", id);
|
|
fAlgorithm = kDHRLatched;
|
|
break;
|
|
}
|
|
|
|
if (srcLen > kExpectedSize || srcLen < kExpectedSize-8) {
|
|
LOGI(" DHR file is not ~%d bytes long (got %d)",
|
|
kExpectedSize, srcLen);
|
|
goto bail;
|
|
}
|
|
|
|
/* line layout is same as standard hires */
|
|
ReformatHiRes::InitLineOffset(fLineOffset);
|
|
InitColorLookup();
|
|
|
|
pDib = DHRScreenToBitmap(srcBuf);
|
|
if (pDib == NULL)
|
|
goto bail;
|
|
|
|
SetResultBuffer(pOutput, pDib);
|
|
retval = 0;
|
|
|
|
bail:
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Initialize the 4-bit-window color lookup table.
|
|
*/
|
|
void ReformatDHR::InitColorLookup(void)
|
|
{
|
|
for (int ii = 0; ii < 4; ii++) {
|
|
for (int jj = 0; jj < kNumDHRColors; jj++) {
|
|
int num = jj;
|
|
for (int kk = 0; kk < ii; kk++) {
|
|
if (num & 0x01)
|
|
num |= 0x10;
|
|
num >>= 1;
|
|
num &= 0x0f;
|
|
}
|
|
fColorLookup[ii][jj] = num;
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Convert a buffer of double-hires data to a 16-color DIB.
|
|
*/
|
|
MyDIBitmap* ReformatDHR::DHRScreenToBitmap(const uint8_t* buf)
|
|
{
|
|
MyDIBitmap* pDib = new MyDIBitmap;
|
|
uint8_t* outBuf;
|
|
const int kMaxLook = 4; // padding to adjust for lookbehind/lookahead
|
|
int pixelBits[kMaxLook+kPixelsPerLine+kMaxLook]; // 560 mono pixels
|
|
unsigned int colorBuf[kOutputWidth]; // 560 color pixels
|
|
int line;
|
|
|
|
/* color map */
|
|
enum {
|
|
kColorBlack = 0, // 0000
|
|
kColorRed, // 0001
|
|
kColorBrown, // 0010
|
|
kColorOrange, // 0011 hcolor=5
|
|
kColorDarkGreen, // 0100
|
|
kColorGrey1, // 0101
|
|
kColorGreen, // 0110 hcolor=1
|
|
kColorYellow, // 0111
|
|
kColorDarkBlue, // 1000
|
|
kColorPurple, // 1001 hcolor=2
|
|
kColorGrey2, // 1010
|
|
kColorPink, // 1011
|
|
kColorMediumBlue, // 1100 hcolor=6
|
|
kColorLightBlue, // 1101
|
|
kColorAqua, // 1110
|
|
kColorWhite, // 1110
|
|
kNumColors
|
|
};
|
|
RGBQUAD colorConv[kNumColors];
|
|
colorConv[0] = fPalette[kPaletteBlack];
|
|
colorConv[1] = fPalette[kPaletteRed];
|
|
colorConv[2] = fPalette[kPaletteBrown];
|
|
colorConv[3] = fPalette[kPaletteOrange];
|
|
colorConv[4] = fPalette[kPaletteDarkGreen];
|
|
colorConv[5] = fPalette[kPaletteDarkGrey];
|
|
colorConv[6] = fPalette[kPaletteGreen];
|
|
colorConv[7] = fPalette[kPaletteYellow];
|
|
colorConv[8] = fPalette[kPaletteDarkBlue];
|
|
colorConv[9] = fPalette[kPalettePurple];
|
|
colorConv[10] = fPalette[kPaletteLightGrey];
|
|
colorConv[11] = fPalette[kPalettePink];
|
|
colorConv[12] = fPalette[kPaletteMediumBlue];
|
|
colorConv[13] = fPalette[kPaletteLightBlue];
|
|
colorConv[14] = fPalette[kPaletteAqua];
|
|
colorConv[15] = fPalette[kPaletteWhite];
|
|
|
|
ASSERT(kNumColors == kPaletteSize);
|
|
ASSERT(kNumDHRColors == kNumColors);
|
|
|
|
ASSERT(kOutputWidth == kPixelsPerLine);
|
|
|
|
if (pDib == NULL)
|
|
goto bail;
|
|
|
|
outBuf = (uint8_t*) pDib->Create(kOutputWidth, kOutputHeight,
|
|
4, kNumColors);
|
|
if (outBuf == NULL) {
|
|
delete pDib;
|
|
pDib = NULL;
|
|
goto bail;
|
|
}
|
|
pDib->SetColorTable(colorConv);
|
|
|
|
|
|
/*
|
|
* Run through the lines.
|
|
*
|
|
* This is reasonably inefficient, since I'm splitting things into
|
|
* their constituent bits and then, for the most part, just stuffing
|
|
* them right back together. Someday, if fatally bored, this should
|
|
* be optimized.
|
|
*/
|
|
for (line = 0; line < kNumLines; line++) {
|
|
const uint8_t* lineData = buf + fLineOffset[line];
|
|
int* bitPtr = pixelBits + kMaxLook;
|
|
|
|
/* this is really just to clear the fore and aft MaxLook bits */
|
|
memset(pixelBits, 0, sizeof(pixelBits));
|
|
|
|
/* unravel the bits */
|
|
for (int byt = 0; byt < kPixelsPerLine / 7; byt++) {
|
|
uint8_t val;
|
|
|
|
if (byt & 0x01) {
|
|
/* odd pixels come from main memory */
|
|
val = *(lineData+kPageSize);
|
|
lineData++;
|
|
} else {
|
|
/* even pixels come from aux mem */
|
|
val = *lineData;
|
|
}
|
|
|
|
for (int bit = 0; bit < 7; bit++) {
|
|
*bitPtr++ = val & 0x01;
|
|
val >>= 1;
|
|
}
|
|
}
|
|
ASSERT(lineData <= buf + kPageSize);
|
|
ASSERT((char*)bitPtr == (char*)pixelBits +
|
|
sizeof(pixelBits) - kMaxLook*sizeof(pixelBits[0]));
|
|
|
|
/*
|
|
* Convert the bits to colors.
|
|
*/
|
|
int idx;
|
|
if (fAlgorithm == kDHRBlackWhite) {
|
|
for (idx = 0; idx < kPixelsPerLine; idx ++) {
|
|
int bufTarget = idx;
|
|
|
|
if (!pixelBits[idx]) {
|
|
colorBuf[bufTarget] = kColorBlack;
|
|
} else {
|
|
colorBuf[bufTarget] = kColorWhite;
|
|
}
|
|
}
|
|
} else if (fAlgorithm == kDHRPlain140) {
|
|
/*
|
|
* Very simple: every four pixels is a solid color. Not too
|
|
* close to reality, but easy to implement.
|
|
*/
|
|
int pixVal = 0;
|
|
bitPtr = pixelBits + kMaxLook;
|
|
|
|
for (idx = 0; idx < kPixelsPerLine/4; idx++) {
|
|
pixVal = *bitPtr++;
|
|
pixVal = (pixVal << 1) | (*bitPtr++);
|
|
pixVal = (pixVal << 1) | (*bitPtr++);
|
|
pixVal = (pixVal << 1) | (*bitPtr++);
|
|
colorBuf[idx*4] = pixVal;
|
|
colorBuf[idx*4+1] = pixVal;
|
|
colorBuf[idx*4+2] = pixVal;
|
|
colorBuf[idx*4+3] = pixVal;
|
|
}
|
|
ASSERT(bitPtr == pixelBits + sizeof(pixelBits)/sizeof(pixelBits[0]) - kMaxLook);
|
|
} else if (fAlgorithm == kDHRWindow) {
|
|
/*
|
|
* The way we determine the value of the color at pixel N
|
|
* is by looking at the pixels at N-3, N-2, N-1, and N.
|
|
*
|
|
* We manage this with a continously shifting 4-bit-wide
|
|
* window.
|
|
*
|
|
* Note to self: interesting case at line 87, pixels 200-240,
|
|
* in "screen2".
|
|
*/
|
|
int pixVal = 0;
|
|
bitPtr = pixelBits + kMaxLook;
|
|
|
|
for (idx = 0; idx < kPixelsPerLine; idx++) {
|
|
pixVal = (pixVal << 1) & 0x0f;
|
|
if (*bitPtr++)
|
|
pixVal |= 1;
|
|
colorBuf[idx] = fColorLookup[(idx+1) & 0x03][pixVal];
|
|
|
|
}
|
|
ASSERT(bitPtr <= pixelBits + sizeof(pixelBits)/sizeof(pixelBits[0]));
|
|
#if 0
|
|
/*
|
|
* Zero-stop pass, where we set the luminosity to zero if we
|
|
* see four zeros in a row.
|
|
*/
|
|
bitPtr = pixelBits + kMaxLook;
|
|
for (idx = 0; idx < kPixelsPerLine; idx++) {
|
|
if (!bitPtr[idx] && !bitPtr[idx+1] &&
|
|
!bitPtr[idx+2] && !bitPtr[idx+3])
|
|
{
|
|
//if (line == 87 && idx > 200 && idx < 240) {
|
|
// LOGI(" %4d ERASE", idx);
|
|
//}
|
|
/*colorBuf[idx] =*/ colorBuf[idx+1] =
|
|
colorBuf[idx+2] = /*colorBuf[idx+3] =*/ kColorBlack;
|
|
}
|
|
}
|
|
#endif
|
|
} else if (fAlgorithm == kDHRLatched) {
|
|
/*
|
|
* We determine the value of the color at pixel N is by looking
|
|
* at the pixels at N-3, N-2, N-1, and N. When we see a color
|
|
* transition, we also look at (N+1..N+4) to special-case
|
|
* white/black transitions. This is necessary to reduce the
|
|
* color fringes around sharply defined objects.
|
|
*
|
|
* Once a color is "latched", we keep outputting that color
|
|
* until we find a new one that we like more.
|
|
*
|
|
* We manage this with a continously shifting 8-bit-wide window.
|
|
*
|
|
* Note to self: interesting case at line=98, pixels 50-80.
|
|
*/
|
|
unsigned int whole;
|
|
int newColor, oldColor;
|
|
|
|
bitPtr = pixelBits;
|
|
|
|
whole = 0;
|
|
for (idx = 0; idx < 8; idx++) {
|
|
whole <<= 1;
|
|
if (*bitPtr++)
|
|
whole |= 1;
|
|
}
|
|
ASSERT((whole & (~0xff)) == 0);
|
|
|
|
/* grab the color of the "previous" 4 pixels */
|
|
oldColor = fColorLookup[idx & 0x03][whole & 0x0f];
|
|
|
|
for (idx = 0; idx < kPixelsPerLine; idx++, bitPtr++) {
|
|
//if (line == 98 && idx > 50 && idx < 80) {
|
|
// if (!(idx % 4)) {
|
|
// LOGI(" idx %3d: bits=0x%02x PPPPCNNN",
|
|
// idx, whole & 0xff);
|
|
// }
|
|
//}
|
|
|
|
/* shift another bit in, to give us 3 prev and 4 next */
|
|
/* looks like PPPCNNNN */
|
|
ASSERT(*bitPtr == 0 || *bitPtr == 1);
|
|
whole = (whole << 1) | *bitPtr;
|
|
whole &= 0xff; // not needed; useful for printfs
|
|
|
|
/* get the new color (from PPPC bits) */
|
|
newColor = fColorLookup[(idx+1) & 0x03][(whole & 0xf0) >> 4];
|
|
|
|
//if (line == 98 && idx > 50 && idx < 80) {
|
|
// LOGI(" idx %3d: old=%-2d new=%-2d (bits=0x%02x)", idx,
|
|
// oldColor, newColor, whole & 0xff);
|
|
//}
|
|
|
|
if (newColor != oldColor) {
|
|
/*
|
|
* Transition to new color; check for white/black blocks
|
|
* in *next* chunk of pixels. The goal is to eliminate
|
|
* color fringes on white/black boundaries, which are the
|
|
* most easily visible.
|
|
*/
|
|
int shift1, shift2, shift3;
|
|
shift1 = (whole >> 3) & 0x0f; // PPCN
|
|
shift2 = (whole >> 2) & 0x0f; // PCNN
|
|
shift3 = (whole >> 1) & 0x0f; // CNNN
|
|
|
|
if (shift1 == 0x0f || shift2 == 0x0f || shift3 == 0x0f)
|
|
newColor = kColorWhite;
|
|
else if (shift1 == 0 || shift2 == 0 || shift3 == 0)
|
|
newColor = kColorBlack;
|
|
//if (line == 98 && idx > 50 && idx < 80) {
|
|
// LOGI(" idx %3d: S new=%-2d", idx, newColor);
|
|
//}
|
|
}
|
|
|
|
//if (line == 98 && idx > 50 && idx < 80) {
|
|
//newColor = kColorYellow;
|
|
//}
|
|
|
|
colorBuf[idx] = newColor;
|
|
|
|
/*
|
|
* Use the new color as the old color for the next iteration.
|
|
* This is *NOT* the same as getting the color from PPPP
|
|
* before shifting next round, because we might have
|
|
* overridden white or black above. In that case, the new
|
|
* color would be compared against white or black in the
|
|
* transition check, instead of comparing against the actual
|
|
* color of the PPPP pixels.
|
|
*/
|
|
oldColor = newColor; // latch it
|
|
//oldColor = fColorLookup[idx & 0x03][whole & 0x0f];
|
|
|
|
}
|
|
ASSERT(bitPtr <= pixelBits + sizeof(pixelBits)/sizeof(pixelBits[0]));
|
|
} else {
|
|
|
|
ASSERT(false);
|
|
|
|
#if defined(DHR_MULTIPASS)
|
|
unsigned int colorBuf1[kMaxLook+kOutputWidth+kMaxLook];
|
|
int pixVal = 0;
|
|
bitPtr = pixelBits + kMaxLook;
|
|
|
|
/*
|
|
* Start simple.
|
|
*/
|
|
memset(colorBuf1, 0, sizeof(colorBuf1));
|
|
for (idx = 0; idx < kPixelsPerLine/4; idx++) {
|
|
pixVal = *bitPtr++;
|
|
pixVal = (pixVal << 1) | (int)(*bitPtr++);
|
|
pixVal = (pixVal << 1) | (int)(*bitPtr++);
|
|
pixVal = (pixVal << 1) | (int)(*bitPtr++);
|
|
colorBuf1[idx*4 +kMaxLook] = pixVal;
|
|
colorBuf1[idx*4+1 +kMaxLook] = pixVal;
|
|
colorBuf1[idx*4+2 +kMaxLook] = pixVal;
|
|
colorBuf1[idx*4+3 +kMaxLook] = pixVal;
|
|
}
|
|
ASSERT(bitPtr <= pixelBits + sizeof(pixelBits)/sizeof(pixelBits[0]));
|
|
|
|
/*
|
|
* Now go back and patch all of the transitions between colors.
|
|
* The most significant are transitions to and from black,
|
|
* which have to truncate bits.
|
|
*/
|
|
for (idx = 3; idx < kMaxLook+kPixelsPerLine; idx += 4) {
|
|
if (colorBuf1[idx] != colorBuf1[idx+1]) {
|
|
/* color change */
|
|
if (colorBuf1[idx] == 0) {
|
|
/* trim pixels on left */
|
|
pixVal = colorBuf1[idx+1];
|
|
ASSERT(pixVal != 0);
|
|
unsigned int* iptr = &colorBuf1[idx+1];
|
|
while (!(pixVal & 0x08)) {
|
|
*iptr++ = kColorBlack;
|
|
pixVal <<= 1;
|
|
}
|
|
} else if (colorBuf1[idx+1] == 0) {
|
|
/* trim pixels on right */
|
|
pixVal = colorBuf1[idx];
|
|
ASSERT(pixVal != 0);
|
|
unsigned int* iptr = &colorBuf1[idx];
|
|
while (!(pixVal & 0x01)) {
|
|
*iptr-- = kColorBlack;
|
|
pixVal >>= 1;
|
|
}
|
|
} else {
|
|
/*
|
|
* The center four pixels have a color determined
|
|
* like this:
|
|
*
|
|
* orange = 0011
|
|
* pink = 1011
|
|
*
|
|
* Take last two of orange and first two of pink,
|
|
* and swap them so first two of pink come first,
|
|
* e.g. 1011. The color, which also happens to be
|
|
* pink, is what we set the middle four pixels to.
|
|
*
|
|
* Can't explain it, but that's how it works...
|
|
* 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;
|
|
}
|