[Scummvm-git-logs] scummvm master -> 97ae70740c160c27b96a5af516b549a879fada94

[neuromancer]

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Summary:
97ae70740c SCUMM: RA: add codec4/5 post processing


Commit: 97ae70740c160c27b96a5af516b549a879fada94
    https://github.com/scummvm/scummvm/commit/97ae70740c160c27b96a5af516b549a879fada94
Author: Manuel Lauss (manuel.lauss at gmail.com)
Date: 2026-06-03T11:51:05+02:00

Commit Message:
SCUMM: RA: add codec4/5 post processing

Adds the post-processing found in the high-quality implementations
of codec4/5/33/34 of RA1 DOS:  It reduces the inherent "blocky" look
of these codecs.

Changed paths:
    engines/scumm/smush/rebel/codec_ra1.cpp


diff --git a/engines/scumm/smush/rebel/codec_ra1.cpp b/engines/scumm/smush/rebel/codec_ra1.cpp
index e9c0a0ba9e9..3620dea06df 100644
--- a/engines/scumm/smush/rebel/codec_ra1.cpp
+++ b/engines/scumm/smush/rebel/codec_ra1.cpp
@@ -317,6 +317,26 @@ void smushDecodeRA1Block(byte *dst, const byte *src, int left, int top, int widt
 							*(dst + yo * pitch + xo) = *gs;
 					}
 			}
+
+			/* post processing of the hiquality implementations of codec4/5,
+			 * see e.g. ASSAULT.EXE 121e8 - 12242
+			 */
+			if (x <= 0 || y <= 0 || (x + 4) >= mx || (y + 4) >= my)
+				continue;		/* skip unreachable edges */
+			const uint32 dstoff = y * pitch + x;
+			if (s_ra1C4Param & 0x80) {
+				for (int k = 0; k < 4; k++)
+					*(dst + dstoff + k) = ((*(dst + dstoff + k) + *(dst + dstoff + k - pitch)) >> 1) | 0x80;
+				*(dst + dstoff + 1 * pitch) = ((*(dst + dstoff + 1 * pitch) + *(dst + dstoff + 1 * pitch - 1)) >> 1) | 0x80;
+				*(dst + dstoff + 2 * pitch) = ((*(dst + dstoff + 2 * pitch) + *(dst + dstoff + 2 * pitch - 1)) >> 1) | 0x80;
+				*(dst + dstoff + 3 * pitch) = ((*(dst + dstoff + 3 * pitch) + *(dst + dstoff + 3 * pitch - 1)) >> 1) | 0x80;
+			} else {
+				for (int k = 0; k < 4; k++)
+					*(dst + dstoff + k) = ((*(dst + dstoff + k) + *(dst + dstoff + k - pitch)) >> 1) & 0x7f;
+				*(dst + dstoff + 1 * pitch) = ((*(dst + dstoff + 1 * pitch) + *(dst + dstoff + 1 * pitch - 1)) >> 1) & 0x7f;
+				*(dst + dstoff + 2 * pitch) = ((*(dst + dstoff + 2 * pitch) + *(dst + dstoff + 2 * pitch - 1)) >> 1) & 0x7f;
+				*(dst + dstoff + 3 * pitch) = ((*(dst + dstoff + 3 * pitch) + *(dst + dstoff + 3 * pitch - 1)) >> 1) & 0x7f;
+			}
 		}
 	}
 }