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author | Matthew Hoops | 2010-05-23 18:33:55 +0000 |
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committer | Matthew Hoops | 2010-05-23 18:33:55 +0000 |
commit | 2f31b05651baf87ea07bc00cced798955a5fa6be (patch) | |
tree | eedade6bd746422fe45e8c48c76d1dd667a45b20 /graphics/video/codecs/qtrle.cpp | |
parent | e2a388e2f59f689cd89995013236e90a1b004264 (diff) | |
download | scummvm-rg350-2f31b05651baf87ea07bc00cced798955a5fa6be.tar.gz scummvm-rg350-2f31b05651baf87ea07bc00cced798955a5fa6be.tar.bz2 scummvm-rg350-2f31b05651baf87ea07bc00cced798955a5fa6be.zip |
Move Mohawk's QuickTime code to graphics/ (and QDM2 to sound, disabled when Mohawk is not enabled) so SCI can use the code.
svn-id: r49165
Diffstat (limited to 'graphics/video/codecs/qtrle.cpp')
-rw-r--r-- | graphics/video/codecs/qtrle.cpp | 420 |
1 files changed, 420 insertions, 0 deletions
diff --git a/graphics/video/codecs/qtrle.cpp b/graphics/video/codecs/qtrle.cpp new file mode 100644 index 0000000000..3e3fd4cfce --- /dev/null +++ b/graphics/video/codecs/qtrle.cpp @@ -0,0 +1,420 @@ +/* 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. + * + * $URL$ + * $Id$ + * + */ + +// QuickTime RLE Decoder +// Based off ffmpeg's QuickTime RLE decoder (written by Mike Melanson) + +#include "graphics/video/codecs/qtrle.h" + +#include "common/scummsys.h" +#include "common/stream.h" +#include "common/system.h" +#include "graphics/colormasks.h" +#include "graphics/surface.h" + +namespace Graphics { + +QTRLEDecoder::QTRLEDecoder(uint16 width, uint16 height, byte bitsPerPixel) : Codec() { + _bitsPerPixel = bitsPerPixel; + _pixelFormat = g_system->getScreenFormat(); + + // We need to increase the surface size to a multiple of 4 + uint16 wMod = width % 4; + if(wMod != 0) + width += 4 - wMod; + + debug(2, "QTRLE corrected width: %d", width); + + _surface = new Surface(); + _surface->create(width, height, _bitsPerPixel <= 8 ? 1 : _pixelFormat.bytesPerPixel); +} + +#define CHECK_STREAM_PTR(n) \ + if ((stream->pos() + n) > stream->size()) { \ + warning ("Problem: stream out of bounds (%d >= %d)", stream->pos() + n, stream->size()); \ + return; \ + } + +#define CHECK_PIXEL_PTR(n) \ + if ((int32)pixelPtr + n > _surface->w * _surface->h) { \ + warning ("Problem: pixel ptr = %d, pixel limit = %d", pixelPtr + n, _surface->w * _surface->h); \ + return; \ + } \ + +void QTRLEDecoder::decode1(Common::SeekableReadStream *stream, uint32 rowPtr, uint32 linesToChange) { + uint32 pixelPtr = 0; + byte *rgb = (byte *)_surface->pixels; + + while (linesToChange) { + CHECK_STREAM_PTR(2); + byte skip = stream->readByte(); + int8 rleCode = stream->readSByte(); + + if (rleCode == 0) + break; + + if (skip & 0x80) { + linesToChange--; + rowPtr += _surface->w; + pixelPtr = rowPtr + 2 * (skip & 0x7f); + } else + pixelPtr += 2 * skip; + + if (rleCode < 0) { + // decode the run length code + rleCode = -rleCode; + // get the next 2 bytes from the stream, treat them as groups of 8 pixels, and output them rleCode times */ + CHECK_STREAM_PTR(2); + byte pi0 = stream->readByte(); + byte pi1 = stream->readByte(); + CHECK_PIXEL_PTR(rleCode * 2); + + while (rleCode--) { + rgb[pixelPtr++] = pi0; + rgb[pixelPtr++] = pi1; + } + } else { + // copy the same pixel directly to output 2 times + rleCode *= 2; + CHECK_STREAM_PTR(rleCode); + CHECK_PIXEL_PTR(rleCode); + + while (rleCode--) + rgb[pixelPtr++] = stream->readByte(); + } + } +} + +void QTRLEDecoder::decode2_4(Common::SeekableReadStream *stream, uint32 rowPtr, uint32 linesToChange, byte bpp) { + uint32 pixelPtr = 0; + byte *rgb = (byte *)_surface->pixels; + byte numPixels = (bpp == 4) ? 8 : 16; + + while (linesToChange--) { + CHECK_STREAM_PTR(2); + pixelPtr = rowPtr + (numPixels * (stream->readByte() - 1)); + + for (int8 rleCode = stream->readSByte(); rleCode != -1; rleCode = stream->readSByte()) { + if (rleCode == 0) { + // there's another skip code in the stream + CHECK_STREAM_PTR(1); + pixelPtr += (numPixels * (stream->readByte() - 1)); + } else if (rleCode < 0) { + // decode the run length code + rleCode = -rleCode; + + // get the next 4 bytes from the stream, treat them as palette indices, and output them rleCode times */ + CHECK_STREAM_PTR(4); + + byte pi[16]; // 16 palette indices + + for (int8 i = numPixels - 1; i >= 0; i--) { + pi[numPixels - 1 - i] = (stream->readByte() >> ((i * bpp) & 0x07)) & ((1 << bpp) - 1); + + // FIXME: Is this right? + //stream_ptr += ((i & ((num_pixels>>2)-1)) == 0); + if ((i & ((numPixels >> 2) - 1)) == 0) + stream->readByte(); + } + + CHECK_PIXEL_PTR(rleCode * numPixels); + + while (rleCode--) + for (byte i = 0; i < numPixels; i++) + rgb[pixelPtr++] = pi[i]; + } else { + // copy the same pixel directly to output 4 times + rleCode *= 4; + CHECK_STREAM_PTR(rleCode); + CHECK_PIXEL_PTR(rleCode * (numPixels >> 2)); + + while (rleCode--) { + byte temp = stream->readByte(); + if (bpp == 4) { + rgb[pixelPtr++] = (temp >> 4) & 0x0f; + rgb[pixelPtr++] = temp & 0x0f; + } else { + rgb[pixelPtr++] = (temp >> 6) & 0x03; + rgb[pixelPtr++] = (temp >> 4) & 0x03; + rgb[pixelPtr++] = (temp >> 2) & 0x03; + rgb[pixelPtr++] = temp & 0x03; + } + } + } + } + + rowPtr += _surface->w; + } +} + +void QTRLEDecoder::decode8(Common::SeekableReadStream *stream, uint32 rowPtr, uint32 linesToChange) { + uint32 pixelPtr = 0; + byte *rgb = (byte *)_surface->pixels; + + while (linesToChange--) { + CHECK_STREAM_PTR(2); + pixelPtr = rowPtr + 4 * (stream->readByte() - 1); + + for (int8 rleCode = stream->readSByte(); rleCode != -1; rleCode = stream->readSByte()) { + if (rleCode == 0) { + // there's another skip code in the stream + CHECK_STREAM_PTR(1); + pixelPtr += 4 * (stream->readByte() - 1); + } else if (rleCode < 0) { + // decode the run length code + rleCode = -rleCode; + + // get the next 4 bytes from the stream, treat them as palette indices, and output them rleCode times + CHECK_STREAM_PTR(4); + + byte pi[4]; // 4 palette indexes + + for (byte i = 0; i < 4; i++) + pi[i] = stream->readByte(); + + CHECK_PIXEL_PTR(rleCode * 4); + + while (rleCode--) + for (byte i = 0; i < 4; i++) + rgb[pixelPtr++] = pi[i]; + } else { + // copy the same pixel directly to output 4 times + rleCode *= 4; + CHECK_STREAM_PTR(rleCode); + CHECK_PIXEL_PTR(rleCode); + + while (rleCode--) + rgb[pixelPtr++] = stream->readByte(); + } + } + + rowPtr += _surface->w; + } +} + +void QTRLEDecoder::decode16(Common::SeekableReadStream *stream, uint32 rowPtr, uint32 linesToChange) { + uint32 pixelPtr = 0; + OverlayColor *rgb = (OverlayColor *)_surface->pixels; + + while (linesToChange--) { + CHECK_STREAM_PTR(2); + pixelPtr = rowPtr + stream->readByte() - 1; + + for (int8 rleCode = stream->readSByte(); rleCode != -1; rleCode = stream->readSByte()) { + if (rleCode == 0) { + // there's another skip code in the stream + CHECK_STREAM_PTR(1); + pixelPtr += stream->readByte() - 1; + } else if (rleCode < 0) { + // decode the run length code + rleCode = -rleCode; + CHECK_STREAM_PTR(2); + + uint16 rgb16 = stream->readUint16BE(); + + CHECK_PIXEL_PTR(rleCode); + + while (rleCode--) { + // Convert from RGB555 to the format specified by the Overlay + byte r = 0, g = 0, b = 0; + colorToRGB<ColorMasks<555> >(rgb16, r, g, b); + rgb[pixelPtr++] = _pixelFormat.RGBToColor(r, g, b); + } + } else { + CHECK_STREAM_PTR(rleCode * 2); + CHECK_PIXEL_PTR(rleCode); + + // copy pixels directly to output + while (rleCode--) { + uint16 rgb16 = stream->readUint16BE(); + + // Convert from RGB555 to the format specified by the Overlay + byte r = 0, g = 0, b = 0; + colorToRGB<ColorMasks<555> >(rgb16, r, g, b); + rgb[pixelPtr++] = _pixelFormat.RGBToColor(r, g, b); + } + } + } + + rowPtr += _surface->w; + } +} + +void QTRLEDecoder::decode24(Common::SeekableReadStream *stream, uint32 rowPtr, uint32 linesToChange) { + uint32 pixelPtr = 0; + OverlayColor *rgb = (OverlayColor *)_surface->pixels; + + while (linesToChange--) { + CHECK_STREAM_PTR(2); + pixelPtr = rowPtr + stream->readByte() - 1; + + for (int8 rleCode = stream->readSByte(); rleCode != -1; rleCode = stream->readSByte()) { + if (rleCode == 0) { + // there's another skip code in the stream + CHECK_STREAM_PTR(1); + pixelPtr += stream->readByte() - 1; + } else if (rleCode < 0) { + // decode the run length code + rleCode = -rleCode; + + CHECK_STREAM_PTR(3); + + byte r = stream->readByte(); + byte g = stream->readByte(); + byte b = stream->readByte(); + + CHECK_PIXEL_PTR(rleCode); + + while (rleCode--) + rgb[pixelPtr++] = _pixelFormat.RGBToColor(r, g, b); + } else { + CHECK_STREAM_PTR(rleCode * 3); + CHECK_PIXEL_PTR(rleCode); + + // copy pixels directly to output + while (rleCode--) { + byte r = stream->readByte(); + byte g = stream->readByte(); + byte b = stream->readByte(); + rgb[pixelPtr++] = _pixelFormat.RGBToColor(r, g, b); + } + } + } + + rowPtr += _surface->w; + } +} + +void QTRLEDecoder::decode32(Common::SeekableReadStream *stream, uint32 rowPtr, uint32 linesToChange) { + uint32 pixelPtr = 0; + OverlayColor *rgb = (OverlayColor *)_surface->pixels; + + while (linesToChange--) { + CHECK_STREAM_PTR(2); + pixelPtr = rowPtr + stream->readByte() - 1; + + for (int8 rleCode = stream->readSByte(); rleCode != -1; rleCode = stream->readSByte()) { + if (rleCode == 0) { + // there's another skip code in the stream + CHECK_STREAM_PTR(1); + pixelPtr += stream->readByte() - 1; + } else if (rleCode < 0) { + // decode the run length code + rleCode = -rleCode; + + CHECK_STREAM_PTR(4); + + byte a = stream->readByte(); + byte r = stream->readByte(); + byte g = stream->readByte(); + byte b = stream->readByte(); + + CHECK_PIXEL_PTR(rleCode); + + while (rleCode--) + rgb[pixelPtr++] = _pixelFormat.ARGBToColor(a, r, g, b); + } else { + CHECK_STREAM_PTR(rleCode * 4); + CHECK_PIXEL_PTR(rleCode); + + // copy pixels directly to output + while (rleCode--) { + byte a = stream->readByte(); + byte r = stream->readByte(); + byte g = stream->readByte(); + byte b = stream->readByte(); + rgb[pixelPtr++] = _pixelFormat.ARGBToColor(a, r, g, b); + } + } + } + + rowPtr += _surface->w; + } +} + +Surface *QTRLEDecoder::decodeImage(Common::SeekableReadStream *stream) { + uint16 start_line = 0; + uint16 height = _surface->h; + + // check if this frame is even supposed to change + if (stream->size() < 8) + return _surface; + + // start after the chunk size + stream->readUint32BE(); + + // fetch the header + uint16 header = stream->readUint16BE(); + + // if a header is present, fetch additional decoding parameters + if (header & 8) { + if(stream->size() < 14) + return _surface; + start_line = stream->readUint16BE(); + stream->readUint16BE(); // Unknown + height = stream->readUint16BE(); + stream->readUint16BE(); // Unknown + } + + uint32 row_ptr = _surface->w * start_line; + + switch (_bitsPerPixel) { + case 1: + case 33: + decode1(stream, row_ptr, height); + break; + case 2: + case 34: + decode2_4(stream, row_ptr, height, 2); + break; + case 4: + case 36: + decode2_4(stream, row_ptr, height, 4); + break; + case 8: + case 40: + decode8(stream, row_ptr, height); + break; + case 16: + decode16(stream, row_ptr, height); + break; + case 24: + decode24(stream, row_ptr, height); + break; + case 32: + decode32(stream, row_ptr, height); + break; + default: + error ("Unsupported bits per pixel %d", _bitsPerPixel); + } + + return _surface; +} + +QTRLEDecoder::~QTRLEDecoder() { + _surface->free(); +} + +} // End of namespace Graphics |