mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-12 12:09:15 +00:00
575 lines
19 KiB
C++
575 lines
19 KiB
C++
/* 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 "common/debug.h"
|
|
#include "common/endian.h"
|
|
#include "common/stream.h"
|
|
#include "common/substream.h"
|
|
#include "common/textconsole.h"
|
|
|
|
#include "graphics/jpeg.h"
|
|
#include "graphics/pict.h"
|
|
#include "graphics/surface.h"
|
|
|
|
namespace Graphics {
|
|
|
|
// The PICT code is based off of the QuickDraw specs:
|
|
// http://developer.apple.com/legacy/mac/library/documentation/mac/QuickDraw/QuickDraw-461.html
|
|
// http://developer.apple.com/legacy/mac/library/documentation/mac/QuickDraw/QuickDraw-269.html
|
|
|
|
PictDecoder::PictDecoder(PixelFormat pixelFormat) {
|
|
_jpeg = new JPEG();
|
|
_pixelFormat = pixelFormat;
|
|
}
|
|
|
|
PictDecoder::~PictDecoder() {
|
|
delete _jpeg;
|
|
}
|
|
|
|
#define OPCODE(a, b, c) _opcodes.push_back(PICTOpcode(a, &PictDecoder::b, c))
|
|
|
|
void PictDecoder::setupOpcodesCommon() {
|
|
OPCODE(0x0000, o_nop, "NOP");
|
|
OPCODE(0x0001, o_clip, "Clip");
|
|
OPCODE(0x0003, o_txFont, "TxFont");
|
|
OPCODE(0x0004, o_txFace, "TxFace");
|
|
OPCODE(0x0007, o_pnSize, "PnSize");
|
|
OPCODE(0x000D, o_txSize, "TxSize");
|
|
OPCODE(0x0010, o_txRatio, "TxRatio");
|
|
OPCODE(0x0011, o_versionOp, "VersionOp");
|
|
OPCODE(0x001E, o_nop, "DefHilite");
|
|
OPCODE(0x0028, o_longText, "LongText");
|
|
OPCODE(0x00A1, o_longComment, "LongComment");
|
|
OPCODE(0x00FF, o_opEndPic, "OpEndPic");
|
|
OPCODE(0x0C00, o_headerOp, "HeaderOp");
|
|
}
|
|
|
|
void PictDecoder::setupOpcodesNormal() {
|
|
setupOpcodesCommon();
|
|
OPCODE(0x0098, on_packBitsRect, "PackBitsRect");
|
|
OPCODE(0x009A, on_directBitsRect, "DirectBitsRect");
|
|
OPCODE(0x8200, on_compressedQuickTime, "CompressedQuickTime");
|
|
}
|
|
|
|
void PictDecoder::setupOpcodesQuickTime() {
|
|
setupOpcodesCommon();
|
|
OPCODE(0x0098, oq_packBitsRect, "PackBitsRect");
|
|
OPCODE(0x009A, oq_directBitsRect, "DirectBitsRect");
|
|
OPCODE(0x8200, oq_compressedQuickTime, "CompressedQuickTime");
|
|
}
|
|
|
|
#undef OPCODE
|
|
|
|
void PictDecoder::o_nop(Common::SeekableReadStream *) {
|
|
// Nothing to do
|
|
}
|
|
|
|
void PictDecoder::o_clip(Common::SeekableReadStream *stream) {
|
|
// Ignore
|
|
stream->skip(stream->readUint16BE() - 2);
|
|
}
|
|
|
|
void PictDecoder::o_txFont(Common::SeekableReadStream *stream) {
|
|
// Ignore
|
|
stream->readUint16BE();
|
|
}
|
|
|
|
void PictDecoder::o_txFace(Common::SeekableReadStream *stream) {
|
|
// Ignore
|
|
stream->readByte();
|
|
}
|
|
|
|
void PictDecoder::o_pnSize(Common::SeekableReadStream *stream) {
|
|
// Ignore
|
|
stream->readUint16BE();
|
|
stream->readUint16BE();
|
|
}
|
|
|
|
void PictDecoder::o_txSize(Common::SeekableReadStream *stream) {
|
|
// Ignore
|
|
stream->readUint16BE();
|
|
}
|
|
|
|
void PictDecoder::o_txRatio(Common::SeekableReadStream *stream) {
|
|
// Ignore
|
|
stream->readUint16BE();
|
|
stream->readUint16BE();
|
|
stream->readUint16BE();
|
|
stream->readUint16BE();
|
|
}
|
|
|
|
void PictDecoder::o_versionOp(Common::SeekableReadStream *stream) {
|
|
// We only support v2 extended
|
|
if (stream->readUint16BE() != 0x02FF)
|
|
error("Unknown PICT version");
|
|
}
|
|
|
|
void PictDecoder::o_longText(Common::SeekableReadStream *stream) {
|
|
// Ignore
|
|
stream->readUint16BE();
|
|
stream->readUint16BE();
|
|
stream->skip(stream->readByte());
|
|
}
|
|
|
|
void PictDecoder::o_longComment(Common::SeekableReadStream *stream) {
|
|
// Ignore
|
|
stream->readUint16BE();
|
|
stream->skip(stream->readUint16BE());
|
|
}
|
|
|
|
void PictDecoder::o_opEndPic(Common::SeekableReadStream *stream) {
|
|
// We've reached the end of the picture
|
|
_continueParsing = false;
|
|
}
|
|
|
|
void PictDecoder::o_headerOp(Common::SeekableReadStream *stream) {
|
|
// Read the basic header, but we don't really have to do anything with it
|
|
/* uint16 version = */ stream->readUint16BE();
|
|
stream->readUint16BE(); // Reserved
|
|
/* uint32 hRes = */ stream->readUint32BE();
|
|
/* uint32 vRes = */ stream->readUint32BE();
|
|
Common::Rect origResRect;
|
|
origResRect.top = stream->readUint16BE();
|
|
origResRect.left = stream->readUint16BE();
|
|
origResRect.bottom = stream->readUint16BE();
|
|
origResRect.right = stream->readUint16BE();
|
|
stream->readUint32BE(); // Reserved
|
|
}
|
|
|
|
void PictDecoder::on_packBitsRect(Common::SeekableReadStream *stream) {
|
|
// Unpack data (8bpp or lower)
|
|
unpackBitsRect(stream, true);
|
|
}
|
|
|
|
void PictDecoder::on_directBitsRect(Common::SeekableReadStream *stream) {
|
|
// Unpack data (16bpp or higher)
|
|
unpackBitsRect(stream, false);
|
|
}
|
|
|
|
void PictDecoder::on_compressedQuickTime(Common::SeekableReadStream *stream) {
|
|
// OK, here's the fun. We get to completely change how QuickDraw draws
|
|
// the data in PICT files.
|
|
|
|
// Swap out the opcodes to the new ones
|
|
_opcodes.clear();
|
|
setupOpcodesQuickTime();
|
|
|
|
// We set up the surface for JPEG here too
|
|
if (!_outputSurface)
|
|
_outputSurface = new Graphics::Surface();
|
|
_outputSurface->create(_imageRect.width(), _imageRect.height(), _pixelFormat);
|
|
|
|
// We'll decode the first QuickTime data from here, but the QuickTime-specific
|
|
// opcodes will take over from here on out. Normal opcodes, signing off.
|
|
decodeCompressedQuickTime(stream);
|
|
}
|
|
|
|
void PictDecoder::oq_packBitsRect(Common::SeekableReadStream *stream) {
|
|
// Skip any data here (8bpp or lower)
|
|
skipBitsRect(stream, true);
|
|
}
|
|
|
|
void PictDecoder::oq_directBitsRect(Common::SeekableReadStream *stream) {
|
|
// Skip any data here (16bpp or higher)
|
|
skipBitsRect(stream, false);
|
|
}
|
|
|
|
void PictDecoder::oq_compressedQuickTime(Common::SeekableReadStream *stream) {
|
|
// Just pass the data along
|
|
decodeCompressedQuickTime(stream);
|
|
}
|
|
|
|
Surface *PictDecoder::decodeImage(Common::SeekableReadStream *stream, byte *palette) {
|
|
assert(stream);
|
|
|
|
// Initialize opcodes to their normal state
|
|
_opcodes.clear();
|
|
setupOpcodesNormal();
|
|
|
|
_outputSurface = 0;
|
|
_continueParsing = true;
|
|
memset(_palette, 0, sizeof(_palette));
|
|
|
|
uint16 fileSize = stream->readUint16BE();
|
|
|
|
// If we have no file size here, we probably have a PICT from a file
|
|
// and not a resource. The other two bytes are the fileSize which we
|
|
// don't actually need (and already read if from a resource).
|
|
if (!fileSize)
|
|
stream->seek(512 + 2);
|
|
|
|
_imageRect.top = stream->readUint16BE();
|
|
_imageRect.left = stream->readUint16BE();
|
|
_imageRect.bottom = stream->readUint16BE();
|
|
_imageRect.right = stream->readUint16BE();
|
|
_imageRect.debugPrint(0, "PICT Rect:");
|
|
|
|
// NOTE: This is only a subset of the full PICT format.
|
|
// - Only V2 (Extended) Images Supported
|
|
// - CompressedQuickTime (JPEG) compressed data is supported
|
|
// - DirectBitsRect/PackBitsRect compressed data is supported
|
|
for (uint32 opNum = 0; !stream->eos() && !stream->err() && stream->pos() < stream->size() && _continueParsing; opNum++) {
|
|
// PICT v2 opcodes are two bytes
|
|
uint16 opcode = stream->readUint16BE();
|
|
|
|
if (opNum == 0 && opcode != 0x0011)
|
|
error("Cannot find PICT version opcode");
|
|
else if (opNum == 1 && opcode != 0x0C00)
|
|
error("Cannot find PICT header opcode");
|
|
|
|
// Since opcodes are word-aligned, we need to mark our starting
|
|
// position here.
|
|
uint32 startPos = stream->pos();
|
|
|
|
for (uint32 i = 0; i < _opcodes.size(); i++) {
|
|
if (_opcodes[i].op == opcode) {
|
|
debug(4, "Running PICT opcode %04x '%s'", opcode, _opcodes[i].desc);
|
|
(this->*(_opcodes[i].proc))(stream);
|
|
break;
|
|
} else if (i == _opcodes.size() - 1) {
|
|
// Unknown opcode; attempt to continue forward
|
|
warning("Unknown PICT opcode %04x", opcode);
|
|
}
|
|
}
|
|
|
|
// Align
|
|
stream->skip((stream->pos() - startPos) & 1);
|
|
}
|
|
|
|
// If we got a palette throughout this nonsense, go and grab it
|
|
if (palette)
|
|
memcpy(palette, _palette, 256 * 3);
|
|
|
|
return _outputSurface;
|
|
}
|
|
|
|
PictDecoder::PixMap PictDecoder::readPixMap(Common::SeekableReadStream *stream, bool hasBaseAddr) {
|
|
PixMap pixMap;
|
|
pixMap.baseAddr = hasBaseAddr ? stream->readUint32BE() : 0;
|
|
pixMap.rowBytes = stream->readUint16BE() & 0x3fff;
|
|
pixMap.bounds.top = stream->readUint16BE();
|
|
pixMap.bounds.left = stream->readUint16BE();
|
|
pixMap.bounds.bottom = stream->readUint16BE();
|
|
pixMap.bounds.right = stream->readUint16BE();
|
|
pixMap.pmVersion = stream->readUint16BE();
|
|
pixMap.packType = stream->readUint16BE();
|
|
pixMap.packSize = stream->readUint32BE();
|
|
pixMap.hRes = stream->readUint32BE();
|
|
pixMap.vRes = stream->readUint32BE();
|
|
pixMap.pixelType = stream->readUint16BE();
|
|
pixMap.pixelSize = stream->readUint16BE();
|
|
pixMap.cmpCount = stream->readUint16BE();
|
|
pixMap.cmpSize = stream->readUint16BE();
|
|
pixMap.planeBytes = stream->readUint32BE();
|
|
pixMap.pmTable = stream->readUint32BE();
|
|
pixMap.pmReserved = stream->readUint32BE();
|
|
return pixMap;
|
|
}
|
|
|
|
struct PackBitsRectData {
|
|
PictDecoder::PixMap pixMap;
|
|
Common::Rect srcRect;
|
|
Common::Rect dstRect;
|
|
uint16 mode;
|
|
};
|
|
|
|
void PictDecoder::unpackBitsRect(Common::SeekableReadStream *stream, bool hasPalette) {
|
|
static const PixelFormat directBitsFormat16 = PixelFormat(2, 5, 5, 5, 0, 10, 5, 0, 0);
|
|
|
|
PackBitsRectData packBitsData;
|
|
packBitsData.pixMap = readPixMap(stream, !hasPalette);
|
|
|
|
// Read in the palette if there is one present
|
|
if (hasPalette) {
|
|
// See http://developer.apple.com/legacy/mac/library/documentation/mac/QuickDraw/QuickDraw-267.html
|
|
stream->readUint32BE(); // seed
|
|
stream->readUint16BE(); // flags
|
|
uint16 colorCount = stream->readUint16BE() + 1;
|
|
|
|
for (uint32 i = 0; i < colorCount; i++) {
|
|
stream->readUint16BE();
|
|
_palette[i * 3] = stream->readUint16BE() >> 8;
|
|
_palette[i * 3 + 1] = stream->readUint16BE() >> 8;
|
|
_palette[i * 3 + 2] = stream->readUint16BE() >> 8;
|
|
}
|
|
}
|
|
|
|
packBitsData.srcRect.top = stream->readUint16BE();
|
|
packBitsData.srcRect.left = stream->readUint16BE();
|
|
packBitsData.srcRect.bottom = stream->readUint16BE();
|
|
packBitsData.srcRect.right = stream->readUint16BE();
|
|
packBitsData.dstRect.top = stream->readUint16BE();
|
|
packBitsData.dstRect.left = stream->readUint16BE();
|
|
packBitsData.dstRect.bottom = stream->readUint16BE();
|
|
packBitsData.dstRect.right = stream->readUint16BE();
|
|
packBitsData.mode = stream->readUint16BE();
|
|
|
|
uint16 width = packBitsData.srcRect.width();
|
|
uint16 height = packBitsData.srcRect.height();
|
|
|
|
byte bytesPerPixel = 0;
|
|
|
|
if (packBitsData.pixMap.pixelSize <= 8)
|
|
bytesPerPixel = 1;
|
|
else if (packBitsData.pixMap.pixelSize == 32)
|
|
bytesPerPixel = packBitsData.pixMap.cmpCount;
|
|
else
|
|
bytesPerPixel = packBitsData.pixMap.pixelSize / 8;
|
|
|
|
_outputSurface = new Graphics::Surface();
|
|
_outputSurface->create(width, height, (bytesPerPixel == 1) ? PixelFormat::createFormatCLUT8() : _pixelFormat);
|
|
|
|
// Ensure we have enough space in the buffer to hold an entire line's worth of pixels
|
|
uint32 lineSize = MAX<int>(width * bytesPerPixel + (8 * 2 / packBitsData.pixMap.pixelSize), packBitsData.pixMap.rowBytes);
|
|
byte *buffer = new byte[lineSize * height];
|
|
|
|
// Read in amount of data per row
|
|
for (uint16 i = 0; i < packBitsData.pixMap.bounds.height(); i++) {
|
|
// NOTE: Compression 0 is "default". The format in SCI games is packed when 0.
|
|
// In the future, we may need to have something to set the "default" packing
|
|
// format, but this is good for now.
|
|
|
|
if (packBitsData.pixMap.packType == 1 || packBitsData.pixMap.rowBytes < 8) { // Unpacked, Pad-Byte (on 24-bit)
|
|
// TODO: Finish this. Hasn't been needed (yet).
|
|
error("Unpacked DirectBitsRect data (padded)");
|
|
} else if (packBitsData.pixMap.packType == 2) { // Unpacked, No Pad-Byte (on 24-bit)
|
|
// TODO: Finish this. Hasn't been needed (yet).
|
|
error("Unpacked DirectBitsRect data (not padded)");
|
|
} else if (packBitsData.pixMap.packType == 0 || packBitsData.pixMap.packType > 2) { // Packed
|
|
uint16 byteCount = (packBitsData.pixMap.rowBytes > 250) ? stream->readUint16BE() : stream->readByte();
|
|
unpackBitsLine(buffer + i * _outputSurface->w * bytesPerPixel, packBitsData.pixMap.rowBytes, stream->readStream(byteCount), packBitsData.pixMap.pixelSize, bytesPerPixel);
|
|
}
|
|
}
|
|
|
|
switch (bytesPerPixel) {
|
|
case 1:
|
|
// Just copy to the image
|
|
memcpy(_outputSurface->pixels, buffer, _outputSurface->w * _outputSurface->h);
|
|
break;
|
|
case 2:
|
|
// Convert from 16-bit to whatever surface we need
|
|
for (uint16 y = 0; y < _outputSurface->h; y++) {
|
|
for (uint16 x = 0; x < _outputSurface->w; x++) {
|
|
byte r = 0, g = 0, b = 0;
|
|
uint32 color = READ_BE_UINT16(buffer + (y * _outputSurface->w + x) * bytesPerPixel);
|
|
directBitsFormat16.colorToRGB(color, r, g, b);
|
|
if (_pixelFormat.bytesPerPixel == 2)
|
|
*((uint16 *)_outputSurface->getBasePtr(x, y)) = _pixelFormat.RGBToColor(r, g, b);
|
|
else
|
|
*((uint32 *)_outputSurface->getBasePtr(x, y)) = _pixelFormat.RGBToColor(r, g, b);
|
|
}
|
|
}
|
|
break;
|
|
case 3:
|
|
// Convert from 24-bit (planar!) to whatever surface we need
|
|
for (uint16 y = 0; y < _outputSurface->h; y++) {
|
|
for (uint16 x = 0; x < _outputSurface->w; x++) {
|
|
byte r = *(buffer + y * _outputSurface->w * 3 + x);
|
|
byte g = *(buffer + y * _outputSurface->w * 3 + _outputSurface->w + x);
|
|
byte b = *(buffer + y * _outputSurface->w * 3 + _outputSurface->w * 2 + x);
|
|
if (_pixelFormat.bytesPerPixel == 2)
|
|
*((uint16 *)_outputSurface->getBasePtr(x, y)) = _pixelFormat.RGBToColor(r, g, b);
|
|
else
|
|
*((uint32 *)_outputSurface->getBasePtr(x, y)) = _pixelFormat.RGBToColor(r, g, b);
|
|
}
|
|
}
|
|
break;
|
|
case 4:
|
|
// Convert from 32-bit (planar!) to whatever surface we need
|
|
for (uint16 y = 0; y < _outputSurface->h; y++) {
|
|
for (uint16 x = 0; x < _outputSurface->w; x++) {
|
|
byte r = *(buffer + y * _outputSurface->w * 4 + x);
|
|
byte g = *(buffer + y * _outputSurface->w * 4 + _outputSurface->w + x);
|
|
byte b = *(buffer + y * _outputSurface->w * 4 + _outputSurface->w * 2 + x);
|
|
byte a = *(buffer + y * _outputSurface->w * 4 + _outputSurface->w * 3 + x);
|
|
if (_pixelFormat.bytesPerPixel == 2)
|
|
*((uint16 *)_outputSurface->getBasePtr(x, y)) = _pixelFormat.ARGBToColor(r, g, b, a);
|
|
else
|
|
*((uint32 *)_outputSurface->getBasePtr(x, y)) = _pixelFormat.ARGBToColor(r, g, b, a);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
delete[] buffer;
|
|
}
|
|
|
|
void PictDecoder::unpackBitsLine(byte *out, uint32 length, Common::SeekableReadStream *data, byte bitsPerPixel, byte bytesPerPixel) {
|
|
uint32 dataDecoded = 0;
|
|
byte bytesPerDecode = (bytesPerPixel == 2) ? 2 : 1;
|
|
|
|
while (data->pos() < data->size() && dataDecoded < length) {
|
|
byte op = data->readByte();
|
|
|
|
if (op & 0x80) {
|
|
uint32 runSize = (op ^ 255) + 2;
|
|
uint16 value = (bytesPerDecode == 2) ? data->readUint16BE() : data->readByte();
|
|
|
|
for (uint32 i = 0; i < runSize; i++) {
|
|
if (bytesPerDecode == 2) {
|
|
WRITE_BE_UINT16(out, value);
|
|
out += 2;
|
|
} else {
|
|
outputPixelBuffer(out, value, bitsPerPixel);
|
|
}
|
|
}
|
|
dataDecoded += runSize * bytesPerDecode;
|
|
} else {
|
|
uint32 runSize = (op + 1) * bytesPerDecode;
|
|
|
|
for (uint32 i = 0; i < runSize; i++)
|
|
outputPixelBuffer(out, data->readByte(), bitsPerPixel);
|
|
|
|
dataDecoded += runSize;
|
|
}
|
|
}
|
|
|
|
// HACK: Even if the data is 24-bit, rowBytes is still 32-bit
|
|
if (bytesPerPixel == 3)
|
|
dataDecoded += length / 4;
|
|
|
|
if (length != dataDecoded)
|
|
warning("Mismatched PackBits read (%d/%d)", dataDecoded, length);
|
|
|
|
delete data;
|
|
}
|
|
|
|
void PictDecoder::skipBitsRect(Common::SeekableReadStream *stream, bool hasPalette) {
|
|
// Step through a PackBitsRect/DirectBitsRect function
|
|
|
|
if (!hasPalette)
|
|
stream->readUint32BE();
|
|
|
|
uint16 rowBytes = stream->readUint16BE();
|
|
uint16 height = stream->readUint16BE();
|
|
stream->readUint16BE();
|
|
height = stream->readUint16BE() - height;
|
|
stream->readUint16BE();
|
|
|
|
uint16 packType;
|
|
uint16 pixelSize; // FIXME: unused
|
|
|
|
// Top two bits signify PixMap vs BitMap
|
|
if (rowBytes & 0xC000) {
|
|
// PixMap
|
|
stream->readUint16BE();
|
|
packType = stream->readUint16BE();
|
|
stream->skip(14);
|
|
pixelSize = stream->readUint16BE();
|
|
stream->skip(16);
|
|
|
|
if (hasPalette) {
|
|
stream->readUint32BE();
|
|
stream->readUint16BE();
|
|
stream->skip((stream->readUint16BE() + 1) * 8);
|
|
}
|
|
|
|
rowBytes &= 0x3FFF;
|
|
} else {
|
|
// BitMap
|
|
packType = 0;
|
|
pixelSize = 1;
|
|
}
|
|
|
|
stream->skip(18);
|
|
|
|
for (uint16 i = 0; i < height; i++) {
|
|
if (packType == 1 || packType == 2 || rowBytes < 8)
|
|
error("Unpacked PackBitsRect data");
|
|
else if (packType == 0 || packType > 2)
|
|
stream->skip((rowBytes > 250) ? stream->readUint16BE() : stream->readByte());
|
|
}
|
|
}
|
|
|
|
void PictDecoder::outputPixelBuffer(byte *&out, byte value, byte bitsPerPixel) {
|
|
switch (bitsPerPixel) {
|
|
case 1:
|
|
for (int i = 7; i >= 0; i--)
|
|
*out++ = (value >> i) & 1;
|
|
break;
|
|
case 2:
|
|
for (int i = 6; i >= 0; i -= 2)
|
|
*out++ = (value >> i) & 3;
|
|
break;
|
|
case 4:
|
|
*out++ = (value >> 4) & 0xf;
|
|
*out++ = value & 0xf;
|
|
break;
|
|
default:
|
|
*out++ = value;
|
|
}
|
|
}
|
|
|
|
// Compressed QuickTime details can be found here:
|
|
// http://developer.apple.com/legacy/mac/library/#documentation/QuickTime/Rm/CompressDecompress/ImageComprMgr/B-Chapter/2TheImageCompression.html
|
|
// http://developer.apple.com/legacy/mac/library/#documentation/QuickTime/Rm/CompressDecompress/ImageComprMgr/F-Chapter/6WorkingwiththeImage.html
|
|
|
|
void PictDecoder::decodeCompressedQuickTime(Common::SeekableReadStream *stream) {
|
|
// First, read all the fields from the opcode
|
|
uint32 dataSize = stream->readUint32BE();
|
|
uint32 startPos = stream->pos();
|
|
|
|
/* uint16 version = */ stream->readUint16BE();
|
|
|
|
// Read in the display matrix
|
|
uint32 matrix[3][3];
|
|
for (uint32 i = 0; i < 3; i++)
|
|
for (uint32 j = 0; j < 3; j++)
|
|
matrix[i][j] = stream->readUint32BE();
|
|
|
|
// We currently only support offseting images vertically from the matrix
|
|
uint16 xOffset = 0;
|
|
uint16 yOffset = matrix[2][1] >> 16;
|
|
|
|
uint32 matteSize = stream->readUint32BE();
|
|
stream->skip(8); // matte rect
|
|
/* uint16 transferMode = */ stream->readUint16BE();
|
|
stream->skip(8); // src rect
|
|
/* uint32 accuracy = */ stream->readUint32BE();
|
|
uint32 maskSize = stream->readUint32BE();
|
|
|
|
// Skip the matte and mask
|
|
stream->skip(matteSize + maskSize);
|
|
|
|
// Now we've reached the image descriptor, so read the relevant data from that
|
|
uint32 idStart = stream->pos();
|
|
uint32 idSize = stream->readUint32BE();
|
|
stream->skip(40); // miscellaneous stuff
|
|
uint32 jpegSize = stream->readUint32BE();
|
|
stream->skip(idSize - (stream->pos() - idStart)); // more useless stuff
|
|
|
|
Common::SeekableReadStream *jpegStream = new Common::SeekableSubReadStream(stream, stream->pos(), stream->pos() + jpegSize);
|
|
|
|
if (!_jpeg->read(jpegStream))
|
|
error("PictDecoder::decodeCompressedQuickTime(): Could not decode JPEG data");
|
|
|
|
Graphics::Surface *jpegSurface = _jpeg->getSurface(_pixelFormat);
|
|
|
|
for (uint16 y = 0; y < jpegSurface->h; y++)
|
|
memcpy(_outputSurface->getBasePtr(0 + xOffset, y + yOffset), jpegSurface->getBasePtr(0, y), jpegSurface->w * _pixelFormat.bytesPerPixel);
|
|
|
|
stream->seek(startPos + dataSize);
|
|
delete jpegStream;
|
|
}
|
|
|
|
} // End of namespace Graphics
|