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author | md5 | 2011-03-09 15:04:31 +0200 |
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committer | md5 | 2011-03-09 15:06:42 +0200 |
commit | 7e517b7808569f90d6257310702c6d52ca2d7699 (patch) | |
tree | bfa7e9d30edeb529001aab54f0296494542d4d11 /engines/sci | |
parent | bd82ebd080bf97fad8831d3ad6bdaa01d3158d21 (diff) | |
download | scummvm-rg350-7e517b7808569f90d6257310702c6d52ca2d7699.tar.gz scummvm-rg350-7e517b7808569f90d6257310702c6d52ca2d7699.tar.bz2 scummvm-rg350-7e517b7808569f90d6257310702c6d52ca2d7699.zip |
SCI: Some cleanup and fixes to the view unpacking code
- Added comments for all the different view unpacking algorithms
- Merged the SCI1 VGA and SCI1.1 VGA unpacking code
- Fixed views in Longbow Amiga (the palette is still broken, though)
- Used memset()/memcpy() instead of looping through
- Fixed a regression of rev. d2ad789 (LSL1 Spanish, bug #3135872)
Diffstat (limited to 'engines/sci')
-rw-r--r-- | engines/sci/graphics/view.cpp | 210 |
1 files changed, 116 insertions, 94 deletions
diff --git a/engines/sci/graphics/view.cpp b/engines/sci/graphics/view.cpp index fd74714495..870e3c9a5d 100644 --- a/engines/sci/graphics/view.cpp +++ b/engines/sci/graphics/view.cpp @@ -375,116 +375,138 @@ void unpackCelData(byte *inBuffer, byte *celBitmap, byte clearColor, int pixelCo byte *outPtr = celBitmap; byte curByte, runLength; byte *rlePtr = inBuffer + rlePos; + // The existence of a literal position pointer signifies data with two + // separate streams, most likely a SCI1.1 view byte *literalPtr = inBuffer + literalPos; int pixelNr = 0; memset(celBitmap, clearColor, pixelCount); - if (!literalPos) { - // decompression for data that has only one combined stream - switch (viewType) { - case kViewEga: - while (pixelNr < pixelCount) { - curByte = *rlePtr++; - runLength = curByte >> 4; - memset(outPtr + pixelNr, curByte & 0x0F, MIN<uint16>(runLength, pixelCount - pixelNr)); - pixelNr += runLength; + // View unpacking: + // + // EGA: + // Each byte is like XXXXYYYY (XXXX: 0 - 15, YYYY: 0 - 15) + // Set the next XXXX pixels to YYYY + // + // Amiga: + // Each byte is like XXXXXYYY (XXXXX: 0 - 31, YYY: 0 - 7) + // - Case A: YYY != 0 + // Set the next YYY pixels to XXXXX + // - Case B: YYY == 0 + // Skip the next XXXXX pixels (i.e. transparency) + // + // Amiga 64: + // Each byte is like XXYYYYYY (XX: 0 - 3, YYYYYY: 0 - 63) + // - Case A: XX != 0 + // Set the next XX pixels to YYYYYY + // - Case B: XX == 0 + // Skip the next YYYYYY pixels (i.e. transparency) + // + // VGA: + // Each byte is like XXYYYYYY (YYYYY: 0 - 63) + // - Case A: XX == 00 (binary) + // Copy next YYYYYY bytes as-is + // - Case B: XX == 01 (binary) + // Same as above, copy YYYYYY + 64 bytes as-is + // - Case C: XX == 10 (binary) + // Set the next YYYYY pixels to the next byte value + // - Case D: XX == 11 (binary) + // Skip the next YYYYY pixels (i.e. transparency) + + if (literalPos && isMacSci11ViewData) { + // KQ6/Freddy Pharkas use byte lengths, all others use uint16 + // The SCI devs must have realized that a max of 255 pixels wide + // was not very good for 320 or 640 width games. + bool hasByteLengths = (g_sci->getGameId() == GID_KQ6 || g_sci->getGameId() == GID_FREDDYPHARKAS); + + // compression for SCI1.1+ Mac + while (pixelNr < pixelCount) { + uint32 pixelLine = pixelNr; + + if (hasByteLengths) { + pixelNr += *rlePtr++; + runLength = *rlePtr++; + } else { + pixelNr += READ_BE_UINT16(rlePtr); + runLength = READ_BE_UINT16(rlePtr + 2); + rlePtr += 4; } - break; - case kViewAmiga: - while (pixelNr < pixelCount) { - curByte = *rlePtr++; - if (curByte & 0x07) { // fill with color - runLength = curByte & 0x07; - curByte = curByte >> 3; - while (runLength-- && pixelNr < pixelCount) - outPtr[pixelNr++] = curByte; - } else { // fill with transparent - runLength = curByte >> 3; - pixelNr += runLength; - } + + while (runLength-- && pixelNr < pixelCount) + outPtr[pixelNr++] = *literalPtr++; + + pixelNr = pixelLine + width; + } + return; + } + + switch (viewType) { + case kViewEga: + while (pixelNr < pixelCount) { + curByte = *rlePtr++; + runLength = curByte >> 4; + memset(outPtr + pixelNr, curByte & 0x0F, MIN<uint16>(runLength, pixelCount - pixelNr)); + pixelNr += runLength; + } + break; + case kViewAmiga: + while (pixelNr < pixelCount) { + curByte = *rlePtr++; + if (curByte & 0x07) { // fill with color + runLength = curByte & 0x07; + curByte = curByte >> 3; + memset(outPtr + pixelNr, curByte, MIN<uint16>(runLength, pixelCount - pixelNr)); + } else { // skip the next pixels (transparency) + runLength = curByte >> 3; } - break; - case kViewAmiga64: - // TODO: This isn't 100% right. Implement it fully. - while (pixelNr < pixelCount) { - curByte = *rlePtr++; + pixelNr += runLength; + } + break; + case kViewAmiga64: + while (pixelNr < pixelCount) { + curByte = *rlePtr++; + if (curByte & 0xC0) { // fill with color runLength = curByte >> 6; memset(outPtr + pixelNr, curByte & 0x3F, MIN<uint16>(runLength, pixelCount - pixelNr)); - pixelNr += runLength; - } - break; - case kViewVga: - case kViewVga11: - while (pixelNr < pixelCount) { - curByte = *rlePtr++; + } else { // skip the next pixels (transparency) runLength = curByte & 0x3F; - switch (curByte & 0xC0) { - case 0: // copy bytes as-is - while (runLength-- && pixelNr < pixelCount) - outPtr[pixelNr++] = *rlePtr++; - break; - case 0x40: // copy bytes as is (In copy case, runLength can go upto 127 i.e. pixel & 0x40). Fixes bug #3135872. - runLength += 64; - break; - case 0x80: // fill with color - memset(outPtr + pixelNr, *rlePtr++, MIN<uint16>(runLength, pixelCount - pixelNr)); - pixelNr += runLength; - break; - case 0xC0: // fill with transparent - pixelNr += runLength; - break; - } } - break; - default: - error("Unsupported picture viewtype"); + pixelNr += runLength; } - } else { - // decompression for data that has two separate streams (probably a SCI 1.1 view) - if (isMacSci11ViewData) { - // KQ6/Freddy Pharkas use byte lengths, all others use uint16 - // The SCI devs must have realized that a max of 255 pixels wide - // was not very good for 320 or 640 width games. - bool hasByteLengths = (g_sci->getGameId() == GID_KQ6 || g_sci->getGameId() == GID_FREDDYPHARKAS); - - // compression for SCI1.1+ Mac - while (pixelNr < pixelCount) { - uint32 pixelLine = pixelNr; - - if (hasByteLengths) { - pixelNr += *rlePtr++; - runLength = *rlePtr++; + break; + case kViewVga: + case kViewVga11: + while (pixelNr < pixelCount) { + curByte = *rlePtr++; + runLength = curByte & 0x3F; + + switch (curByte & 0xC0) { + case 0x40: // copy bytes as is (In copy case, runLength can go up to 127 i.e. pixel & 0x40). Fixes bug #3135872. + runLength += 64; + case 0x00: // copy bytes as-is + if (!literalPos) { + memcpy(outPtr + pixelNr, rlePtr, MIN<uint16>(runLength, pixelCount - pixelNr)); + rlePtr += runLength; } else { - pixelNr += READ_BE_UINT16(rlePtr); - runLength = READ_BE_UINT16(rlePtr + 2); - rlePtr += 4; - } - - while (runLength-- && pixelNr < pixelCount) - outPtr[pixelNr++] = *literalPtr++; - - pixelNr = pixelLine + width; - } - } else { - while (pixelNr < pixelCount) { - curByte = *rlePtr++; - runLength = curByte & 0x3F; - switch (curByte & 0xC0) { - case 0: // copy bytes as-is - while (runLength-- && pixelNr < pixelCount) - outPtr[pixelNr++] = *literalPtr++; - break; - case 0x80: // fill with color + memcpy(outPtr + pixelNr, literalPtr, MIN<uint16>(runLength, pixelCount - pixelNr)); + literalPtr += runLength; + } + break; + case 0x80: // fill with color + if (!literalPos) + memset(outPtr + pixelNr, *rlePtr++, MIN<uint16>(runLength, pixelCount - pixelNr)); + else memset(outPtr + pixelNr, *literalPtr++, MIN<uint16>(runLength, pixelCount - pixelNr)); - pixelNr += runLength; - break; - case 0xC0: // fill with transparent - pixelNr += runLength; - break; - } + break; + case 0xC0: // skip the next pixels (transparency) + break; } + + pixelNr += runLength; } + break; + default: + error("Unsupported picture viewtype"); } } |