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/* 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 "image/codecs/cinepak.h"
#include "image/codecs/cinepak_tables.h"
#include "common/debug.h"
#include "common/stream.h"
#include "common/system.h"
#include "common/textconsole.h"
#include "common/util.h"
#include "graphics/surface.h"
// Code here partially based off of ffmpeg ;)
namespace Image {
namespace {
inline void convertYUVToRGB(const byte *clipTable, byte y, int8 u, int8 v, byte &r, byte &g, byte &b) {
r = clipTable[y + (v << 1)];
g = clipTable[y - (u >> 1) - v];
b = clipTable[y + (u << 1)];
}
inline uint32 convertYUVToColor(const byte *clipTable, const Graphics::PixelFormat &format, byte y, byte u, byte v) {
byte r, g, b;
convertYUVToRGB(clipTable, y, u, v, r, g, b);
return format.RGBToColor(r, g, b);
}
inline uint16 createDitherTableIndex(const byte *clipTable, byte y, int8 u, int8 v) {
byte r, g, b;
convertYUVToRGB(clipTable, y, u, v, r, g, b);
return ((r & 0xF8) << 6) |
((g & 0xF8) << 1) |
((b & 0xF0) >> 4);
}
/**
* Put a raw pixel to the destination surface
*/
template<typename PixelInt>
inline void putPixelRaw(PixelInt *dst, const byte *clipTable, const Graphics::PixelFormat &format, byte y, byte u, byte v) {
*dst = convertYUVToColor(clipTable, format, y, u, v);
}
/**
* Specialized putPixelRaw for palettized 8bpp output
*/
template<>
inline void putPixelRaw(byte *dst, const byte *clipTable, const Graphics::PixelFormat &format, byte y, byte u, byte v) {
*dst = y;
}
/**
* The default codebook converter: raw output.
*/
struct CodebookConverterRaw {
template<typename PixelInt>
static inline void decodeBlock1(byte codebookIndex, const CinepakStrip &strip, PixelInt *(&rows)[4], const byte *clipTable, const byte *colorMap, const Graphics::PixelFormat &format) {
const CinepakCodebook &codebook = strip.v1_codebook[codebookIndex];
putPixelRaw(rows[0] + 0, clipTable, format, codebook.y[0], codebook.u, codebook.v);
putPixelRaw(rows[0] + 1, clipTable, format, codebook.y[0], codebook.u, codebook.v);
putPixelRaw(rows[1] + 0, clipTable, format, codebook.y[0], codebook.u, codebook.v);
putPixelRaw(rows[1] + 1, clipTable, format, codebook.y[0], codebook.u, codebook.v);
putPixelRaw(rows[0] + 2, clipTable, format, codebook.y[1], codebook.u, codebook.v);
putPixelRaw(rows[0] + 3, clipTable, format, codebook.y[1], codebook.u, codebook.v);
putPixelRaw(rows[1] + 2, clipTable, format, codebook.y[1], codebook.u, codebook.v);
putPixelRaw(rows[1] + 3, clipTable, format, codebook.y[1], codebook.u, codebook.v);
putPixelRaw(rows[2] + 0, clipTable, format, codebook.y[2], codebook.u, codebook.v);
putPixelRaw(rows[2] + 1, clipTable, format, codebook.y[2], codebook.u, codebook.v);
putPixelRaw(rows[3] + 0, clipTable, format, codebook.y[2], codebook.u, codebook.v);
putPixelRaw(rows[3] + 1, clipTable, format, codebook.y[2], codebook.u, codebook.v);
putPixelRaw(rows[2] + 2, clipTable, format, codebook.y[3], codebook.u, codebook.v);
putPixelRaw(rows[2] + 3, clipTable, format, codebook.y[3], codebook.u, codebook.v);
putPixelRaw(rows[3] + 2, clipTable, format, codebook.y[3], codebook.u, codebook.v);
putPixelRaw(rows[3] + 3, clipTable, format, codebook.y[3], codebook.u, codebook.v);
}
template<typename PixelInt>
static inline void decodeBlock4(const byte (&codebookIndex)[4], const CinepakStrip &strip, PixelInt *(&rows)[4], const byte *clipTable, const byte *colorMap, const Graphics::PixelFormat &format) {
const CinepakCodebook &codebook1 = strip.v4_codebook[codebookIndex[0]];
putPixelRaw(rows[0] + 0, clipTable, format, codebook1.y[0], codebook1.u, codebook1.v);
putPixelRaw(rows[0] + 1, clipTable, format, codebook1.y[1], codebook1.u, codebook1.v);
putPixelRaw(rows[1] + 0, clipTable, format, codebook1.y[2], codebook1.u, codebook1.v);
putPixelRaw(rows[1] + 1, clipTable, format, codebook1.y[3], codebook1.u, codebook1.v);
const CinepakCodebook &codebook2 = strip.v4_codebook[codebookIndex[1]];
putPixelRaw(rows[0] + 2, clipTable, format, codebook2.y[0], codebook2.u, codebook2.v);
putPixelRaw(rows[0] + 3, clipTable, format, codebook2.y[1], codebook2.u, codebook2.v);
putPixelRaw(rows[1] + 2, clipTable, format, codebook2.y[2], codebook2.u, codebook2.v);
putPixelRaw(rows[1] + 3, clipTable, format, codebook2.y[3], codebook2.u, codebook2.v);
const CinepakCodebook &codebook3 = strip.v4_codebook[codebookIndex[2]];
putPixelRaw(rows[2] + 0, clipTable, format, codebook3.y[0], codebook3.u, codebook3.v);
putPixelRaw(rows[2] + 1, clipTable, format, codebook3.y[1], codebook3.u, codebook3.v);
putPixelRaw(rows[3] + 0, clipTable, format, codebook3.y[2], codebook3.u, codebook3.v);
putPixelRaw(rows[3] + 1, clipTable, format, codebook3.y[3], codebook3.u, codebook3.v);
const CinepakCodebook &codebook4 = strip.v4_codebook[codebookIndex[3]];
putPixelRaw(rows[2] + 2, clipTable, format, codebook4.y[0], codebook4.u, codebook4.v);
putPixelRaw(rows[2] + 3, clipTable, format, codebook4.y[1], codebook4.u, codebook4.v);
putPixelRaw(rows[3] + 2, clipTable, format, codebook4.y[2], codebook4.u, codebook4.v);
putPixelRaw(rows[3] + 3, clipTable, format, codebook4.y[3], codebook4.u, codebook4.v);
}
};
/**
* Codebook converter that dithers in VFW-style
*/
struct CodebookConverterDitherVFW {
static inline void decodeBlock1(byte codebookIndex, const CinepakStrip &strip, byte *(&rows)[4], const byte *clipTable, const byte *colorMap, const Graphics::PixelFormat &format) {
const CinepakCodebook &codebook = strip.v1_codebook[codebookIndex];
byte blockBuffer[16];
ditherCodebookSmooth(codebook, blockBuffer, colorMap);
rows[0][0] = blockBuffer[0];
rows[0][1] = blockBuffer[1];
rows[0][2] = blockBuffer[2];
rows[0][3] = blockBuffer[3];
rows[1][0] = blockBuffer[4];
rows[1][1] = blockBuffer[5];
rows[1][2] = blockBuffer[6];
rows[1][3] = blockBuffer[7];
rows[2][0] = blockBuffer[8];
rows[2][1] = blockBuffer[9];
rows[2][2] = blockBuffer[10];
rows[2][3] = blockBuffer[11];
rows[3][0] = blockBuffer[12];
rows[3][1] = blockBuffer[13];
rows[3][2] = blockBuffer[14];
rows[3][3] = blockBuffer[15];
}
static inline void decodeBlock4(const byte (&codebookIndex)[4], const CinepakStrip &strip, byte *(&rows)[4], const byte *clipTable, const byte *colorMap, const Graphics::PixelFormat &format) {
byte blockBuffer[16];
ditherCodebookDetail(strip.v4_codebook[codebookIndex[0]], blockBuffer, colorMap);
rows[0][0] = blockBuffer[0];
rows[0][1] = blockBuffer[1];
rows[1][0] = blockBuffer[4];
rows[1][1] = blockBuffer[5];
ditherCodebookDetail(strip.v4_codebook[codebookIndex[1]], blockBuffer, colorMap);
rows[0][2] = blockBuffer[2];
rows[0][3] = blockBuffer[3];
rows[1][2] = blockBuffer[6];
rows[1][3] = blockBuffer[7];
ditherCodebookDetail(strip.v4_codebook[codebookIndex[2]], blockBuffer, colorMap);
rows[2][0] = blockBuffer[8];
rows[2][1] = blockBuffer[9];
rows[3][0] = blockBuffer[12];
rows[3][1] = blockBuffer[13];
ditherCodebookDetail(strip.v4_codebook[codebookIndex[3]], blockBuffer, colorMap);
rows[2][2] = blockBuffer[10];
rows[2][3] = blockBuffer[11];
rows[3][2] = blockBuffer[14];
rows[3][3] = blockBuffer[15];
}
private:
static inline void ditherCodebookDetail(const CinepakCodebook &codebook, byte *dst, const byte *colorMap) {
int uLookup = (byte)codebook.u * 2;
int vLookup = (byte)codebook.v * 2;
uint32 uv1 = s_uLookup[uLookup] | s_vLookup[vLookup];
uint32 uv2 = s_uLookup[uLookup + 1] | s_vLookup[vLookup + 1];
int yLookup1 = codebook.y[0] * 2;
int yLookup2 = codebook.y[1] * 2;
int yLookup3 = codebook.y[2] * 2;
int yLookup4 = codebook.y[3] * 2;
uint32 pixelGroup1 = uv2 | s_yLookup[yLookup1 + 1];
uint32 pixelGroup2 = uv2 | s_yLookup[yLookup2 + 1];
uint32 pixelGroup3 = uv1 | s_yLookup[yLookup3];
uint32 pixelGroup4 = uv1 | s_yLookup[yLookup4];
uint32 pixelGroup5 = uv1 | s_yLookup[yLookup1];
uint32 pixelGroup6 = uv1 | s_yLookup[yLookup2];
uint32 pixelGroup7 = uv2 | s_yLookup[yLookup3 + 1];
uint32 pixelGroup8 = uv2 | s_yLookup[yLookup4 + 1];
dst[0] = getRGBLookupEntry(colorMap, pixelGroup1 & 0xFFFF);
dst[1] = getRGBLookupEntry(colorMap, pixelGroup2 >> 16);
dst[2] = getRGBLookupEntry(colorMap, pixelGroup5 & 0xFFFF);
dst[3] = getRGBLookupEntry(colorMap, pixelGroup6 >> 16);
dst[4] = getRGBLookupEntry(colorMap, pixelGroup3 & 0xFFFF);
dst[5] = getRGBLookupEntry(colorMap, pixelGroup4 >> 16);
dst[6] = getRGBLookupEntry(colorMap, pixelGroup7 & 0xFFFF);
dst[7] = getRGBLookupEntry(colorMap, pixelGroup8 >> 16);
dst[8] = getRGBLookupEntry(colorMap, pixelGroup1 >> 16);
dst[9] = getRGBLookupEntry(colorMap, pixelGroup6 & 0xFFFF);
dst[10] = getRGBLookupEntry(colorMap, pixelGroup5 >> 16);
dst[11] = getRGBLookupEntry(colorMap, pixelGroup2 & 0xFFFF);
dst[12] = getRGBLookupEntry(colorMap, pixelGroup3 >> 16);
dst[13] = getRGBLookupEntry(colorMap, pixelGroup8 & 0xFFFF);
dst[14] = getRGBLookupEntry(colorMap, pixelGroup7 >> 16);
dst[15] = getRGBLookupEntry(colorMap, pixelGroup4 & 0xFFFF);
}
static inline void ditherCodebookSmooth(const CinepakCodebook &codebook, byte *dst, const byte *colorMap) {
int uLookup = (byte)codebook.u * 2;
int vLookup = (byte)codebook.v * 2;
uint32 uv1 = s_uLookup[uLookup] | s_vLookup[vLookup];
uint32 uv2 = s_uLookup[uLookup + 1] | s_vLookup[vLookup + 1];
int yLookup1 = codebook.y[0] * 2;
int yLookup2 = codebook.y[1] * 2;
int yLookup3 = codebook.y[2] * 2;
int yLookup4 = codebook.y[3] * 2;
uint32 pixelGroup1 = uv2 | s_yLookup[yLookup1 + 1];
uint32 pixelGroup2 = uv1 | s_yLookup[yLookup2];
uint32 pixelGroup3 = uv1 | s_yLookup[yLookup1];
uint32 pixelGroup4 = uv2 | s_yLookup[yLookup2 + 1];
uint32 pixelGroup5 = uv2 | s_yLookup[yLookup3 + 1];
uint32 pixelGroup6 = uv1 | s_yLookup[yLookup3];
uint32 pixelGroup7 = uv1 | s_yLookup[yLookup4];
uint32 pixelGroup8 = uv2 | s_yLookup[yLookup4 + 1];
dst[0] = getRGBLookupEntry(colorMap, pixelGroup1 & 0xFFFF);
dst[1] = getRGBLookupEntry(colorMap, pixelGroup1 >> 16);
dst[2] = getRGBLookupEntry(colorMap, pixelGroup2 & 0xFFFF);
dst[3] = getRGBLookupEntry(colorMap, pixelGroup2 >> 16);
dst[4] = getRGBLookupEntry(colorMap, pixelGroup3 & 0xFFFF);
dst[5] = getRGBLookupEntry(colorMap, pixelGroup3 >> 16);
dst[6] = getRGBLookupEntry(colorMap, pixelGroup4 & 0xFFFF);
dst[7] = getRGBLookupEntry(colorMap, pixelGroup4 >> 16);
dst[8] = getRGBLookupEntry(colorMap, pixelGroup5 >> 16);
dst[9] = getRGBLookupEntry(colorMap, pixelGroup6 & 0xFFFF);
dst[10] = getRGBLookupEntry(colorMap, pixelGroup7 >> 16);
dst[11] = getRGBLookupEntry(colorMap, pixelGroup8 & 0xFFFF);
dst[12] = getRGBLookupEntry(colorMap, pixelGroup6 >> 16);
dst[13] = getRGBLookupEntry(colorMap, pixelGroup5 & 0xFFFF);
dst[14] = getRGBLookupEntry(colorMap, pixelGroup8 >> 16);
dst[15] = getRGBLookupEntry(colorMap, pixelGroup7 & 0xFFFF);
}
static inline byte getRGBLookupEntry(const byte *colorMap, uint16 index) {
return colorMap[s_defaultPaletteLookup[CLIP<int>(index, 0, 1023)]];
}
};
/**
* Codebook converter that dithers in QT-style
*/
struct CodebookConverterDitherQT {
static inline void decodeBlock1(byte codebookIndex, const CinepakStrip &strip, byte *(&rows)[4], const byte *clipTable, const byte *colorMap, const Graphics::PixelFormat &format) {
const byte *colorPtr = strip.v1_dither + (codebookIndex << 2);
WRITE_UINT32(rows[0], READ_UINT32(colorPtr));
WRITE_UINT32(rows[1], READ_UINT32(colorPtr + 1024));
WRITE_UINT32(rows[2], READ_UINT32(colorPtr + 2048));
WRITE_UINT32(rows[3], READ_UINT32(colorPtr + 3072));
}
static inline void decodeBlock4(const byte (&codebookIndex)[4], const CinepakStrip &strip, byte *(&rows)[4], const byte *clipTable, const byte *colorMap, const Graphics::PixelFormat &format) {
const byte *colorPtr = strip.v4_dither + (codebookIndex[0] << 2);
WRITE_UINT16(rows[0] + 0, READ_UINT16(colorPtr + 0));
WRITE_UINT16(rows[1] + 0, READ_UINT16(colorPtr + 2));
colorPtr = strip.v4_dither + (codebookIndex[1] << 2);
WRITE_UINT16(rows[0] + 2, READ_UINT16(colorPtr + 1024));
WRITE_UINT16(rows[1] + 2, READ_UINT16(colorPtr + 1026));
colorPtr = strip.v4_dither + (codebookIndex[2] << 2);
WRITE_UINT16(rows[2] + 0, READ_UINT16(colorPtr + 2048));
WRITE_UINT16(rows[3] + 0, READ_UINT16(colorPtr + 2050));
colorPtr = strip.v4_dither + (codebookIndex[3] << 2);
WRITE_UINT16(rows[2] + 2, READ_UINT16(colorPtr + 3072));
WRITE_UINT16(rows[3] + 2, READ_UINT16(colorPtr + 3074));
}
};
template<typename PixelInt, typename CodebookConverter>
void decodeVectorsTmpl(CinepakFrame &frame, const byte *clipTable, const byte *colorMap, Common::SeekableReadStream &stream, uint16 strip, byte chunkID, uint32 chunkSize) {
uint32 flag = 0, mask = 0;
PixelInt *iy[4];
int32 startPos = stream.pos();
for (uint16 y = frame.strips[strip].rect.top; y < frame.strips[strip].rect.bottom; y += 4) {
iy[0] = (PixelInt *)frame.surface->getBasePtr(frame.strips[strip].rect.left, + y);
iy[1] = iy[0] + frame.width;
iy[2] = iy[1] + frame.width;
iy[3] = iy[2] + frame.width;
for (uint16 x = frame.strips[strip].rect.left; x < frame.strips[strip].rect.right; x += 4) {
if ((chunkID & 0x01) && !(mask >>= 1)) {
if ((stream.pos() - startPos + 4) > (int32)chunkSize)
return;
flag = stream.readUint32BE();
mask = 0x80000000;
}
if (!(chunkID & 0x01) || (flag & mask)) {
if (!(chunkID & 0x02) && !(mask >>= 1)) {
if ((stream.pos() - startPos + 4) > (int32)chunkSize)
return;
flag = stream.readUint32BE();
mask = 0x80000000;
}
if ((chunkID & 0x02) || (~flag & mask)) {
if ((stream.pos() - startPos + 1) > (int32)chunkSize)
return;
// Get the codebook
byte codebook = stream.readByte();
CodebookConverter::decodeBlock1(codebook, frame.strips[strip], iy, clipTable, colorMap, frame.surface->format);
} else if (flag & mask) {
if ((stream.pos() - startPos + 4) > (int32)chunkSize)
return;
byte codebook[4];
stream.read(codebook, 4);
CodebookConverter::decodeBlock4(codebook, frame.strips[strip], iy, clipTable, colorMap, frame.surface->format);
}
}
for (byte i = 0; i < 4; i++)
iy[i] += 4;
}
}
}
} // End of anonymous namespace
CinepakDecoder::CinepakDecoder(int bitsPerPixel) : Codec(), _bitsPerPixel(bitsPerPixel) {
_curFrame.surface = 0;
_curFrame.strips = 0;
_y = 0;
_colorMap = 0;
_ditherPalette = 0;
_ditherType = kDitherTypeUnknown;
if (bitsPerPixel == 8) {
_pixelFormat = Graphics::PixelFormat::createFormatCLUT8();
} else {
_pixelFormat = g_system->getScreenFormat();
// Default to a 32bpp format, if in 8bpp mode
if (_pixelFormat.bytesPerPixel == 1)
_pixelFormat = Graphics::PixelFormat(4, 8, 8, 8, 8, 8, 16, 24, 0);
}
// Create a lookup for the clip function
// This dramatically improves the performance of the color conversion
_clipTableBuf = new byte[1024];
for (uint i = 0; i < 1024; i++) {
if (i <= 512)
_clipTableBuf[i] = 0;
else if (i >= 768)
_clipTableBuf[i] = 255;
else
_clipTableBuf[i] = i - 512;
}
_clipTable = _clipTableBuf + 512;
}
CinepakDecoder::~CinepakDecoder() {
if (_curFrame.surface) {
_curFrame.surface->free();
delete _curFrame.surface;
}
delete[] _curFrame.strips;
delete[] _clipTableBuf;
delete[] _colorMap;
delete[] _ditherPalette;
}
const Graphics::Surface *CinepakDecoder::decodeFrame(Common::SeekableReadStream &stream) {
_curFrame.flags = stream.readByte();
_curFrame.length = (stream.readByte() << 16);
_curFrame.length |= stream.readUint16BE();
_curFrame.width = stream.readUint16BE();
_curFrame.height = stream.readUint16BE();
_curFrame.stripCount = stream.readUint16BE();
if (!_curFrame.strips)
_curFrame.strips = new CinepakStrip[_curFrame.stripCount];
debug(4, "Cinepak Frame: Width = %d, Height = %d, Strip Count = %d", _curFrame.width, _curFrame.height, _curFrame.stripCount);
// Borrowed from FFMPEG. This should cut out the extra data Cinepak for Sega has (which is useless).
// The theory behind this is that this is here to confuse standard Cinepak decoders. But, we won't let that happen! ;)
if (_curFrame.length != (uint32)stream.size()) {
if (stream.readUint16BE() == 0xFE00)
stream.readUint32BE();
else if ((stream.size() % _curFrame.length) == 0)
stream.seek(-2, SEEK_CUR);
}
if (!_curFrame.surface) {
_curFrame.surface = new Graphics::Surface();
_curFrame.surface->create(_curFrame.width, _curFrame.height, _pixelFormat);
}
// Reset the y variable.
_y = 0;
for (uint16 i = 0; i < _curFrame.stripCount; i++) {
if (i > 0 && !(_curFrame.flags & 1)) { // Use codebooks from last strip
for (uint16 j = 0; j < 256; j++) {
_curFrame.strips[i].v1_codebook[j] = _curFrame.strips[i - 1].v1_codebook[j];
_curFrame.strips[i].v4_codebook[j] = _curFrame.strips[i - 1].v4_codebook[j];
}
// Copy the QuickTime dither tables
memcpy(_curFrame.strips[i].v1_dither, _curFrame.strips[i - 1].v1_dither, 256 * 4 * 4 * 4);
memcpy(_curFrame.strips[i].v4_dither, _curFrame.strips[i - 1].v4_dither, 256 * 4 * 4 * 4);
}
_curFrame.strips[i].id = stream.readUint16BE();
_curFrame.strips[i].length = stream.readUint16BE() - 12; // Subtract the 12 byte header
_curFrame.strips[i].rect.top = _y; stream.readUint16BE(); // Ignore, substitute with our own.
_curFrame.strips[i].rect.left = 0; stream.readUint16BE(); // Ignore, substitute with our own
_curFrame.strips[i].rect.bottom = _y + stream.readUint16BE();
_curFrame.strips[i].rect.right = _curFrame.width; stream.readUint16BE(); // Ignore, substitute with our own
// Sanity check. Because Cinepak is based on 4x4 blocks, the width and height of each strip needs to be divisible by 4.
assert(!(_curFrame.strips[i].rect.width() % 4) && !(_curFrame.strips[i].rect.height() % 4));
uint32 pos = stream.pos();
while ((uint32)stream.pos() < (pos + _curFrame.strips[i].length) && !stream.eos()) {
byte chunkID = stream.readByte();
if (stream.eos())
break;
// Chunk Size is 24-bit, ignore the first 4 bytes
uint32 chunkSize = stream.readByte() << 16;
chunkSize += stream.readUint16BE() - 4;
int32 startPos = stream.pos();
switch (chunkID) {
case 0x20:
case 0x21:
case 0x24:
case 0x25:
loadCodebook(stream, i, 4, chunkID, chunkSize);
break;
case 0x22:
case 0x23:
case 0x26:
case 0x27:
loadCodebook(stream, i, 1, chunkID, chunkSize);
break;
case 0x30:
case 0x31:
case 0x32:
if (_ditherPalette)
ditherVectors(stream, i, chunkID, chunkSize);
else
decodeVectors(stream, i, chunkID, chunkSize);
break;
default:
warning("Unknown Cinepak chunk ID %02x", chunkID);
return _curFrame.surface;
}
if (stream.pos() != startPos + (int32)chunkSize)
stream.seek(startPos + chunkSize);
}
_y = _curFrame.strips[i].rect.bottom;
}
return _curFrame.surface;
}
void CinepakDecoder::loadCodebook(Common::SeekableReadStream &stream, uint16 strip, byte codebookType, byte chunkID, uint32 chunkSize) {
CinepakCodebook *codebook = (codebookType == 1) ? _curFrame.strips[strip].v1_codebook : _curFrame.strips[strip].v4_codebook;
int32 startPos = stream.pos();
uint32 flag = 0, mask = 0;
for (uint16 i = 0; i < 256; i++) {
if ((chunkID & 0x01) && !(mask >>= 1)) {
if ((stream.pos() - startPos + 4) > (int32)chunkSize)
break;
flag = stream.readUint32BE();
mask = 0x80000000;
}
if (!(chunkID & 0x01) || (flag & mask)) {
byte n = (chunkID & 0x04) ? 4 : 6;
if ((stream.pos() - startPos + n) > (int32)chunkSize)
break;
stream.read(codebook[i].y, 4);
if (n == 6) {
codebook[i].u = stream.readSByte();
codebook[i].v = stream.readSByte();
} else {
// This codebook type indicates either greyscale or
// palettized video. For greyscale, default us to
// 0 for both u and v.
codebook[i].u = 0;
codebook[i].v = 0;
}
// Dither the codebook if we're dithering for QuickTime
if (_ditherType == kDitherTypeQT)
ditherCodebookQT(strip, codebookType, i);
}
}
}
void CinepakDecoder::ditherCodebookQT(uint16 strip, byte codebookType, uint16 codebookIndex) {
if (codebookType == 1) {
const CinepakCodebook &codebook = _curFrame.strips[strip].v1_codebook[codebookIndex];
byte *output = _curFrame.strips[strip].v1_dither + (codebookIndex << 2);
byte *ditherEntry = _colorMap + createDitherTableIndex(_clipTable, codebook.y[0], codebook.u, codebook.v);
output[0x000] = ditherEntry[0x0000];
output[0x001] = ditherEntry[0x4000];
output[0x400] = ditherEntry[0xC000];
output[0x401] = ditherEntry[0x0000];
ditherEntry = _colorMap + createDitherTableIndex(_clipTable, codebook.y[1], codebook.u, codebook.v);
output[0x002] = ditherEntry[0x8000];
output[0x003] = ditherEntry[0xC000];
output[0x402] = ditherEntry[0x4000];
output[0x403] = ditherEntry[0x8000];
ditherEntry = _colorMap + createDitherTableIndex(_clipTable, codebook.y[2], codebook.u, codebook.v);
output[0x800] = ditherEntry[0x4000];
output[0x801] = ditherEntry[0x8000];
output[0xC00] = ditherEntry[0x8000];
output[0xC01] = ditherEntry[0xC000];
ditherEntry = _colorMap + createDitherTableIndex(_clipTable, codebook.y[3], codebook.u, codebook.v);
output[0x802] = ditherEntry[0xC000];
output[0x803] = ditherEntry[0x0000];
output[0xC02] = ditherEntry[0x0000];
output[0xC03] = ditherEntry[0x4000];
} else {
const CinepakCodebook &codebook = _curFrame.strips[strip].v4_codebook[codebookIndex];
byte *output = _curFrame.strips[strip].v4_dither + (codebookIndex << 2);
byte *ditherEntry = _colorMap + createDitherTableIndex(_clipTable, codebook.y[0], codebook.u, codebook.v);
output[0x000] = ditherEntry[0x0000];
output[0x400] = ditherEntry[0x8000];
output[0x800] = ditherEntry[0x4000];
output[0xC00] = ditherEntry[0xC000];
ditherEntry = _colorMap + createDitherTableIndex(_clipTable, codebook.y[1], codebook.u, codebook.v);
output[0x001] = ditherEntry[0x4000];
output[0x401] = ditherEntry[0xC000];
output[0x801] = ditherEntry[0x8000];
output[0xC01] = ditherEntry[0x0000];
ditherEntry = _colorMap + createDitherTableIndex(_clipTable, codebook.y[2], codebook.u, codebook.v);
output[0x002] = ditherEntry[0xC000];
output[0x402] = ditherEntry[0x4000];
output[0x802] = ditherEntry[0x8000];
output[0xC02] = ditherEntry[0x0000];
ditherEntry = _colorMap + createDitherTableIndex(_clipTable, codebook.y[3], codebook.u, codebook.v);
output[0x003] = ditherEntry[0x0000];
output[0x403] = ditherEntry[0x8000];
output[0x803] = ditherEntry[0xC000];
output[0xC03] = ditherEntry[0x4000];
}
}
void CinepakDecoder::decodeVectors(Common::SeekableReadStream &stream, uint16 strip, byte chunkID, uint32 chunkSize) {
if (_curFrame.surface->format.bytesPerPixel == 1) {
decodeVectorsTmpl<byte, CodebookConverterRaw>(_curFrame, _clipTable, _colorMap, stream, strip, chunkID, chunkSize);
} else if (_curFrame.surface->format.bytesPerPixel == 2) {
decodeVectorsTmpl<uint16, CodebookConverterRaw>(_curFrame, _clipTable, _colorMap, stream, strip, chunkID, chunkSize);
} else if (_curFrame.surface->format.bytesPerPixel == 4) {
decodeVectorsTmpl<uint32, CodebookConverterRaw>(_curFrame, _clipTable, _colorMap, stream, strip, chunkID, chunkSize);
}
}
bool CinepakDecoder::canDither(DitherType type) const {
return (type == kDitherTypeVFW || type == kDitherTypeQT) && _bitsPerPixel == 24;
}
void CinepakDecoder::setDither(DitherType type, const byte *palette) {
assert(canDither(type));
delete[] _colorMap;
delete[] _ditherPalette;
_ditherPalette = new byte[256 * 3];
memcpy(_ditherPalette, palette, 256 * 3);
_dirtyPalette = true;
_pixelFormat = Graphics::PixelFormat::createFormatCLUT8();
_ditherType = type;
if (type == kDitherTypeVFW) {
_colorMap = new byte[221];
for (int i = 0; i < 221; i++)
_colorMap[i] = findNearestRGB(i);
} else {
// Generate QuickTime dither table
// 4 blocks of 0x4000 bytes (RGB554 lookup)
_colorMap = createQuickTimeDitherTable(palette, 256);
}
}
byte CinepakDecoder::findNearestRGB(int index) const {
int r = s_defaultPalette[index * 3];
int g = s_defaultPalette[index * 3 + 1];
int b = s_defaultPalette[index * 3 + 2];
byte result = 0;
int diff = 0x7FFFFFFF;
for (int i = 0; i < 256; i++) {
int bDiff = b - (int)_ditherPalette[i * 3 + 2];
int curDiffB = diff - (bDiff * bDiff);
if (curDiffB > 0) {
int gDiff = g - (int)_ditherPalette[i * 3 + 1];
int curDiffG = curDiffB - (gDiff * gDiff);
if (curDiffG > 0) {
int rDiff = r - (int)_ditherPalette[i * 3];
int curDiffR = curDiffG - (rDiff * rDiff);
if (curDiffR > 0) {
diff -= curDiffR;
result = i;
if (diff == 0)
break;
}
}
}
}
return result;
}
void CinepakDecoder::ditherVectors(Common::SeekableReadStream &stream, uint16 strip, byte chunkID, uint32 chunkSize) {
if (_ditherType == kDitherTypeVFW)
decodeVectorsTmpl<byte, CodebookConverterDitherVFW>(_curFrame, _clipTable, _colorMap, stream, strip, chunkID, chunkSize);
else
decodeVectorsTmpl<byte, CodebookConverterDitherQT>(_curFrame, _clipTable, _colorMap, stream, strip, chunkID, chunkSize);
}
} // End of namespace Image
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