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-rw-r--r--engines/sci/graphics/view.cpp210
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");
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-18 02:19:37 +0000