diff options
Diffstat (limited to 'engines/mohawk/video/smc.cpp')
-rw-r--r-- | engines/mohawk/video/smc.cpp | 642 |
1 files changed, 321 insertions, 321 deletions
diff --git a/engines/mohawk/video/smc.cpp b/engines/mohawk/video/smc.cpp index c646d5be21..c196d97e1e 100644 --- a/engines/mohawk/video/smc.cpp +++ b/engines/mohawk/video/smc.cpp @@ -34,16 +34,16 @@ namespace Mohawk { #define ADVANCE_BLOCK() \ { \ - pixelPtr += 4; \ - if (pixelPtr >= _surface->w) { \ - pixelPtr = 0; \ - rowPtr += _surface->w * 4; \ - } \ - totalBlocks--; \ - if (totalBlocks < 0) { \ - warning("block counter just went negative (this should not happen)"); \ - return _surface; \ - } \ + pixelPtr += 4; \ + if (pixelPtr >= _surface->w) { \ + pixelPtr = 0; \ + rowPtr += _surface->w * 4; \ + } \ + totalBlocks--; \ + if (totalBlocks < 0) { \ + warning("block counter just went negative (this should not happen)"); \ + return _surface; \ + } \ } SMCDecoder::SMCDecoder(uint16 width, uint16 height) { @@ -52,333 +52,333 @@ SMCDecoder::SMCDecoder(uint16 width, uint16 height) { } Graphics::Surface *SMCDecoder::decodeImage(Common::SeekableReadStream *stream) { - byte *pixels = (byte *)_surface->pixels; + byte *pixels = (byte *)_surface->pixels; uint32 numBlocks = 0; - uint32 colorFlags = 0; - uint32 colorFlagsA = 0; - uint32 colorFlagsB = 0; + uint32 colorFlags = 0; + uint32 colorFlagsA = 0; + uint32 colorFlagsB = 0; const uint16 rowInc = _surface->w - 4; - int32 rowPtr = 0; - int32 pixelPtr = 0; - uint32 blockPtr = 0; - uint32 prevBlockPtr = 0; - uint32 prevBlockPtr1 = 0, prevBlockPtr2 = 0; - byte prevBlockFlag = false; - byte pixel = 0; - - uint32 colorPairIndex = 0; - uint32 colorQuadIndex = 0; - uint32 colorOctetIndex = 0; + int32 rowPtr = 0; + int32 pixelPtr = 0; + uint32 blockPtr = 0; + uint32 prevBlockPtr = 0; + uint32 prevBlockPtr1 = 0, prevBlockPtr2 = 0; + byte prevBlockFlag = false; + byte pixel = 0; + + uint32 colorPairIndex = 0; + uint32 colorQuadIndex = 0; + uint32 colorOctetIndex = 0; uint32 colorTableIndex = 0; // indices to color pair, quad, or octet tables - int32 chunkSize = stream->readUint32BE() & 0x00FFFFFF; - if (chunkSize != stream->size()) + int32 chunkSize = stream->readUint32BE() & 0x00FFFFFF; + if (chunkSize != stream->size()) warning("MOV chunk size != SMC chunk size (%d != %d); ignoring SMC chunk size", chunkSize, stream->size()); - int32 totalBlocks = ((_surface->w + 3) / 4) * ((_surface->h + 3) / 4); - - // traverse through the blocks - while (totalBlocks != 0) { - // sanity checks - - // make sure stream ptr hasn't gone out of bounds - if (stream->pos() > stream->size()) { - warning("SMC decoder just went out of bounds (stream ptr = %d, chunk size = %d)", stream->pos(), stream->size()); - return _surface; - } - - // make sure the row pointer hasn't gone wild - if (rowPtr >= _surface->w * _surface->h) { - warning("SMC decoder just went out of bounds (row ptr = %d, size = %d)", rowPtr, _surface->w * _surface->h); - return _surface; - } - - byte opcode = stream->readByte(); - - switch (opcode & 0xF0) { - // skip n blocks - case 0x00: - case 0x10: - numBlocks = GET_BLOCK_COUNT(); - while (numBlocks--) { - ADVANCE_BLOCK(); - } - break; - - // repeat last block n times - case 0x20: - case 0x30: - numBlocks = GET_BLOCK_COUNT(); - - // sanity check - if (rowPtr == 0 && pixelPtr == 0) { - warning("encountered repeat block opcode (%02X) but no blocks rendered yet", opcode & 0xF0); - break; - } - - // figure out where the previous block started - if (pixelPtr == 0) - prevBlockPtr1 = (rowPtr - _surface->w * 4) + _surface->w - 4; - else - prevBlockPtr1 = rowPtr + pixelPtr - 4; - - while (numBlocks--) { - blockPtr = rowPtr + pixelPtr; - prevBlockPtr = prevBlockPtr1; - for (byte y = 0; y < 4; y++) { - for (byte x = 0; x < 4; x++) - pixels[blockPtr++] = pixels[prevBlockPtr++]; - blockPtr += rowInc; - prevBlockPtr += rowInc; - } - ADVANCE_BLOCK(); - } - break; - - // repeat previous pair of blocks n times - case 0x40: - case 0x50: - numBlocks = GET_BLOCK_COUNT(); - numBlocks *= 2; - - // sanity check - if (rowPtr == 0 && pixelPtr < 2 * 4) { - warning("encountered repeat block opcode (%02X) but not enough blocks rendered yet", opcode & 0xF0); - break; - } - - // figure out where the previous 2 blocks started - if (pixelPtr == 0) - prevBlockPtr1 = (rowPtr - _surface->w * 4) + _surface->w - 4 * 2; - else if (pixelPtr == 4) - prevBlockPtr1 = (rowPtr - _surface->w * 4) + rowInc; - else - prevBlockPtr1 = rowPtr + pixelPtr - 4 * 2; - - if (pixelPtr == 0) - prevBlockPtr2 = (rowPtr - _surface->w * 4) + rowInc; - else - prevBlockPtr2 = rowPtr + pixelPtr - 4; - - prevBlockFlag = 0; - while (numBlocks--) { - blockPtr = rowPtr + pixelPtr; - - if (prevBlockFlag) - prevBlockPtr = prevBlockPtr2; - else - prevBlockPtr = prevBlockPtr1; - - prevBlockFlag = !prevBlockFlag; - - for (byte y = 0; y < 4; y++) { - for (byte x = 0; x < 4; x++) - pixels[blockPtr++] = pixels[prevBlockPtr++]; - - blockPtr += rowInc; - prevBlockPtr += rowInc; - } - ADVANCE_BLOCK(); - } - break; - - // 1-color block encoding - case 0x60: - case 0x70: - numBlocks = GET_BLOCK_COUNT(); - pixel = stream->readByte(); - - while (numBlocks--) { - blockPtr = rowPtr + pixelPtr; - for (byte y = 0; y < 4; y++) { - for (byte x = 0; x < 4; x++) - pixels[blockPtr++] = pixel; - - blockPtr += rowInc; - } - ADVANCE_BLOCK(); - } - break; - - // 2-color block encoding - case 0x80: - case 0x90: - numBlocks = (opcode & 0x0F) + 1; - - // figure out which color pair to use to paint the 2-color block - if ((opcode & 0xF0) == 0x80) { - // fetch the next 2 colors from bytestream and store in next - // available entry in the color pair table - for (byte i = 0; i < CPAIR; i++) { - pixel = stream->readByte(); - colorTableIndex = CPAIR * colorPairIndex + i; - _colorPairs[colorTableIndex] = pixel; - } - - // this is the base index to use for this block - colorTableIndex = CPAIR * colorPairIndex; - colorPairIndex++; - - // wraparound - if (colorPairIndex == COLORS_PER_TABLE) - colorPairIndex = 0; - } else - colorTableIndex = CPAIR * stream->readByte(); - - while (numBlocks--) { - colorFlags = stream->readUint16BE(); - uint16 flagMask = 0x8000; - blockPtr = rowPtr + pixelPtr; - for (byte y = 0; y < 4; y++) { - for (byte x = 0; x < 4; x++) { - if (colorFlags & flagMask) - pixel = colorTableIndex + 1; - else - pixel = colorTableIndex; - - flagMask >>= 1; - pixels[blockPtr++] = _colorPairs[pixel]; - } - - blockPtr += rowInc; - } - ADVANCE_BLOCK(); - } - break; - - // 4-color block encoding - case 0xA0: - case 0xB0: - numBlocks = (opcode & 0x0F) + 1; - - // figure out which color quad to use to paint the 4-color block - if ((opcode & 0xF0) == 0xA0) { - // fetch the next 4 colors from bytestream and store in next - // available entry in the color quad table - for (byte i = 0; i < CQUAD; i++) { - pixel = stream->readByte(); - colorTableIndex = CQUAD * colorQuadIndex + i; - _colorQuads[colorTableIndex] = pixel; - } - - // this is the base index to use for this block - colorTableIndex = CQUAD * colorQuadIndex; - colorQuadIndex++; - - // wraparound - if (colorQuadIndex == COLORS_PER_TABLE) - colorQuadIndex = 0; - } else - colorTableIndex = CQUAD * stream->readByte(); - - while (numBlocks--) { - colorFlags = stream->readUint32BE(); - - // flag mask actually acts as a bit shift count here - byte flagMask = 30; - blockPtr = rowPtr + pixelPtr; - - for (byte y = 0; y < 4; y++) { - for (byte x = 0; x < 4; x++) { - pixel = colorTableIndex + ((colorFlags >> flagMask) & 0x03); - flagMask -= 2; - pixels[blockPtr++] = _colorQuads[pixel]; - } - blockPtr += rowInc; - } - ADVANCE_BLOCK(); - } - break; - - // 8-color block encoding - case 0xC0: - case 0xD0: - numBlocks = (opcode & 0x0F) + 1; - - // figure out which color octet to use to paint the 8-color block - if ((opcode & 0xF0) == 0xC0) { - // fetch the next 8 colors from bytestream and store in next - // available entry in the color octet table - for (byte i = 0; i < COCTET; i++) { - pixel = stream->readByte(); - colorTableIndex = COCTET * colorOctetIndex + i; - _colorOctets[colorTableIndex] = pixel; - } - - // this is the base index to use for this block - colorTableIndex = COCTET * colorOctetIndex; - colorOctetIndex++; - - // wraparound - if (colorOctetIndex == COLORS_PER_TABLE) - colorOctetIndex = 0; - } else - colorTableIndex = COCTET * stream->readByte(); - - while (numBlocks--) { - /* - For this input of 6 hex bytes: - 01 23 45 67 89 AB - Mangle it to this output: - flags_a = xx012456, flags_b = xx89A37B - */ + int32 totalBlocks = ((_surface->w + 3) / 4) * ((_surface->h + 3) / 4); + + // traverse through the blocks + while (totalBlocks != 0) { + // sanity checks + + // make sure stream ptr hasn't gone out of bounds + if (stream->pos() > stream->size()) { + warning("SMC decoder just went out of bounds (stream ptr = %d, chunk size = %d)", stream->pos(), stream->size()); + return _surface; + } + + // make sure the row pointer hasn't gone wild + if (rowPtr >= _surface->w * _surface->h) { + warning("SMC decoder just went out of bounds (row ptr = %d, size = %d)", rowPtr, _surface->w * _surface->h); + return _surface; + } + + byte opcode = stream->readByte(); + + switch (opcode & 0xF0) { + // skip n blocks + case 0x00: + case 0x10: + numBlocks = GET_BLOCK_COUNT(); + while (numBlocks--) { + ADVANCE_BLOCK(); + } + break; + + // repeat last block n times + case 0x20: + case 0x30: + numBlocks = GET_BLOCK_COUNT(); + + // sanity check + if (rowPtr == 0 && pixelPtr == 0) { + warning("encountered repeat block opcode (%02X) but no blocks rendered yet", opcode & 0xF0); + break; + } + + // figure out where the previous block started + if (pixelPtr == 0) + prevBlockPtr1 = (rowPtr - _surface->w * 4) + _surface->w - 4; + else + prevBlockPtr1 = rowPtr + pixelPtr - 4; + + while (numBlocks--) { + blockPtr = rowPtr + pixelPtr; + prevBlockPtr = prevBlockPtr1; + for (byte y = 0; y < 4; y++) { + for (byte x = 0; x < 4; x++) + pixels[blockPtr++] = pixels[prevBlockPtr++]; + blockPtr += rowInc; + prevBlockPtr += rowInc; + } + ADVANCE_BLOCK(); + } + break; + + // repeat previous pair of blocks n times + case 0x40: + case 0x50: + numBlocks = GET_BLOCK_COUNT(); + numBlocks *= 2; + + // sanity check + if (rowPtr == 0 && pixelPtr < 2 * 4) { + warning("encountered repeat block opcode (%02X) but not enough blocks rendered yet", opcode & 0xF0); + break; + } + + // figure out where the previous 2 blocks started + if (pixelPtr == 0) + prevBlockPtr1 = (rowPtr - _surface->w * 4) + _surface->w - 4 * 2; + else if (pixelPtr == 4) + prevBlockPtr1 = (rowPtr - _surface->w * 4) + rowInc; + else + prevBlockPtr1 = rowPtr + pixelPtr - 4 * 2; + + if (pixelPtr == 0) + prevBlockPtr2 = (rowPtr - _surface->w * 4) + rowInc; + else + prevBlockPtr2 = rowPtr + pixelPtr - 4; + + prevBlockFlag = 0; + while (numBlocks--) { + blockPtr = rowPtr + pixelPtr; + + if (prevBlockFlag) + prevBlockPtr = prevBlockPtr2; + else + prevBlockPtr = prevBlockPtr1; + + prevBlockFlag = !prevBlockFlag; + + for (byte y = 0; y < 4; y++) { + for (byte x = 0; x < 4; x++) + pixels[blockPtr++] = pixels[prevBlockPtr++]; + + blockPtr += rowInc; + prevBlockPtr += rowInc; + } + ADVANCE_BLOCK(); + } + break; + + // 1-color block encoding + case 0x60: + case 0x70: + numBlocks = GET_BLOCK_COUNT(); + pixel = stream->readByte(); + + while (numBlocks--) { + blockPtr = rowPtr + pixelPtr; + for (byte y = 0; y < 4; y++) { + for (byte x = 0; x < 4; x++) + pixels[blockPtr++] = pixel; + + blockPtr += rowInc; + } + ADVANCE_BLOCK(); + } + break; + + // 2-color block encoding + case 0x80: + case 0x90: + numBlocks = (opcode & 0x0F) + 1; + + // figure out which color pair to use to paint the 2-color block + if ((opcode & 0xF0) == 0x80) { + // fetch the next 2 colors from bytestream and store in next + // available entry in the color pair table + for (byte i = 0; i < CPAIR; i++) { + pixel = stream->readByte(); + colorTableIndex = CPAIR * colorPairIndex + i; + _colorPairs[colorTableIndex] = pixel; + } + + // this is the base index to use for this block + colorTableIndex = CPAIR * colorPairIndex; + colorPairIndex++; + + // wraparound + if (colorPairIndex == COLORS_PER_TABLE) + colorPairIndex = 0; + } else + colorTableIndex = CPAIR * stream->readByte(); + + while (numBlocks--) { + colorFlags = stream->readUint16BE(); + uint16 flagMask = 0x8000; + blockPtr = rowPtr + pixelPtr; + for (byte y = 0; y < 4; y++) { + for (byte x = 0; x < 4; x++) { + if (colorFlags & flagMask) + pixel = colorTableIndex + 1; + else + pixel = colorTableIndex; + + flagMask >>= 1; + pixels[blockPtr++] = _colorPairs[pixel]; + } + + blockPtr += rowInc; + } + ADVANCE_BLOCK(); + } + break; + + // 4-color block encoding + case 0xA0: + case 0xB0: + numBlocks = (opcode & 0x0F) + 1; + + // figure out which color quad to use to paint the 4-color block + if ((opcode & 0xF0) == 0xA0) { + // fetch the next 4 colors from bytestream and store in next + // available entry in the color quad table + for (byte i = 0; i < CQUAD; i++) { + pixel = stream->readByte(); + colorTableIndex = CQUAD * colorQuadIndex + i; + _colorQuads[colorTableIndex] = pixel; + } + + // this is the base index to use for this block + colorTableIndex = CQUAD * colorQuadIndex; + colorQuadIndex++; + + // wraparound + if (colorQuadIndex == COLORS_PER_TABLE) + colorQuadIndex = 0; + } else + colorTableIndex = CQUAD * stream->readByte(); + + while (numBlocks--) { + colorFlags = stream->readUint32BE(); + + // flag mask actually acts as a bit shift count here + byte flagMask = 30; + blockPtr = rowPtr + pixelPtr; + + for (byte y = 0; y < 4; y++) { + for (byte x = 0; x < 4; x++) { + pixel = colorTableIndex + ((colorFlags >> flagMask) & 0x03); + flagMask -= 2; + pixels[blockPtr++] = _colorQuads[pixel]; + } + blockPtr += rowInc; + } + ADVANCE_BLOCK(); + } + break; + + // 8-color block encoding + case 0xC0: + case 0xD0: + numBlocks = (opcode & 0x0F) + 1; + + // figure out which color octet to use to paint the 8-color block + if ((opcode & 0xF0) == 0xC0) { + // fetch the next 8 colors from bytestream and store in next + // available entry in the color octet table + for (byte i = 0; i < COCTET; i++) { + pixel = stream->readByte(); + colorTableIndex = COCTET * colorOctetIndex + i; + _colorOctets[colorTableIndex] = pixel; + } + + // this is the base index to use for this block + colorTableIndex = COCTET * colorOctetIndex; + colorOctetIndex++; + + // wraparound + if (colorOctetIndex == COLORS_PER_TABLE) + colorOctetIndex = 0; + } else + colorTableIndex = COCTET * stream->readByte(); + + while (numBlocks--) { + /* + For this input of 6 hex bytes: + 01 23 45 67 89 AB + Mangle it to this output: + flags_a = xx012456, flags_b = xx89A37B + */ // build the color flags byte flagData[6]; stream->read(flagData, 6); - - colorFlagsA = ((READ_BE_UINT16(flagData) & 0xFFF0) << 8) | (READ_BE_UINT16(flagData + 2) >> 4); + + colorFlagsA = ((READ_BE_UINT16(flagData) & 0xFFF0) << 8) | (READ_BE_UINT16(flagData + 2) >> 4); colorFlagsB = ((READ_BE_UINT16(flagData + 4) & 0xFFF0) << 8) | ((flagData[1] & 0xF) << 8) | ((flagData[3] & 0xF) << 4) | (flagData[5] & 0xf); - colorFlags = colorFlagsA; - + colorFlags = colorFlagsA; + // flag mask actually acts as a bit shift count here - byte flagMask = 21; - blockPtr = rowPtr + pixelPtr; - for (byte y = 0; y < 4; y++) { - // reload flags at third row (iteration y == 2) - if (y == 2) { - colorFlags = colorFlagsB; - flagMask = 21; - } - - for (byte x = 0; x < 4; x++) { - pixel = colorTableIndex + ((colorFlags >> flagMask) & 0x07); - flagMask -= 3; - pixels[blockPtr++] = _colorOctets[pixel]; - } - - blockPtr += rowInc; - } - ADVANCE_BLOCK(); - } - break; - - // 16-color block encoding (every pixel is a different color) - case 0xE0: - numBlocks = (opcode & 0x0F) + 1; - - while (numBlocks--) { - blockPtr = rowPtr + pixelPtr; - for (byte y = 0; y < 4; y++) { - for (byte x = 0; x < 4; x++) - pixels[blockPtr++] = stream->readByte(); - - blockPtr += rowInc; - } - ADVANCE_BLOCK(); - } - break; - - case 0xF0: - warning("0xF0 opcode seen in SMC chunk (contact the developers)"); - break; - } - } - + byte flagMask = 21; + blockPtr = rowPtr + pixelPtr; + for (byte y = 0; y < 4; y++) { + // reload flags at third row (iteration y == 2) + if (y == 2) { + colorFlags = colorFlagsB; + flagMask = 21; + } + + for (byte x = 0; x < 4; x++) { + pixel = colorTableIndex + ((colorFlags >> flagMask) & 0x07); + flagMask -= 3; + pixels[blockPtr++] = _colorOctets[pixel]; + } + + blockPtr += rowInc; + } + ADVANCE_BLOCK(); + } + break; + + // 16-color block encoding (every pixel is a different color) + case 0xE0: + numBlocks = (opcode & 0x0F) + 1; + + while (numBlocks--) { + blockPtr = rowPtr + pixelPtr; + for (byte y = 0; y < 4; y++) { + for (byte x = 0; x < 4; x++) + pixels[blockPtr++] = stream->readByte(); + + blockPtr += rowInc; + } + ADVANCE_BLOCK(); + } + break; + + case 0xF0: + warning("0xF0 opcode seen in SMC chunk (contact the developers)"); + break; + } + } + return _surface; } |