GRAPHICS: Add support for PICT opcode $90 BitsRect

Add limited support for unpacked PICT bits which FPFP Mac requires.

SCI games use packed PICT bits unless an image is less than 8 bytes
per row in which case they can't be packed, like FPFP's shovel icon.

Fixes bug #7059 which prevents the game from being completed.

2 files changed, 23 insertions, 4 deletions

diff --git a/image/pict.cpp b/image/pict.cpp
index 1a1d03d7de..a82bba034e 100644
--- a/image/pict.cpp
+++ b/image/pict.cpp
@@ -75,6 +75,7 @@ void PICTDecoder::setupOpcodesCommon() {
 
 void PICTDecoder::setupOpcodesNormal() {
 	setupOpcodesCommon();
+	OPCODE(0x0090, on_bitsRect, "BitsRect");
 	OPCODE(0x0098, on_packBitsRect, "PackBitsRect");
 	OPCODE(0x009A, on_directBitsRect, "DirectBitsRect");
 	OPCODE(0x8200, on_compressedQuickTime, "CompressedQuickTime");
@@ -165,6 +166,11 @@ void PICTDecoder::o_headerOp(Common::SeekableReadStream &stream) {
 	stream.readUint32BE(); // Reserved
 }
 
+void PICTDecoder::on_bitsRect(Common::SeekableReadStream &stream) {
+	// Copy unpacked data with clipped rectangle (8bpp or lower)
+	unpackBitsRect(stream, true);
+}
+
 void PICTDecoder::on_packBitsRect(Common::SeekableReadStream &stream) {
 	// Unpack data (8bpp or lower)
 	unpackBitsRect(stream, true);
@@ -344,13 +350,25 @@ void PICTDecoder::unpackBitsRect(Common::SeekableReadStream &stream, bool withPa
 
 	// Read in amount of data per row
 	for (uint16 i = 0; i < packBitsData.pixMap.bounds.height(); i++) {
-		// NOTE: Compression 0 is "default". The format in SCI games is packed when 0.
-		// In the future, we may need to have something to set the  "default" packing
+		// NOTE: Compression 0 is "default". The format in SCI games is packed when 0
+		// unless rowBytes is less than 8 in which case the pict can't be packed,
+		// such as the shovel inventory icon in FPFP Mac. (bug #7059)
+		// In the future, we may need to have something to set the "default" packing
 		// format, but this is good for now.
 
 		if (packBitsData.pixMap.packType == 1 || packBitsData.pixMap.rowBytes < 8) { // Unpacked, Pad-Byte (on 24-bit)
-			// TODO: Finish this. Hasn't been needed (yet).
-			error("Unpacked DirectBitsRect data (padded)");
+			// only support 1 bpp for now as there is currently only one known
+			//  SCI pict that requires any unpacked support.
+			if (bytesPerPixel == 1 && packBitsData.pixMap.pixelSize == 8) {
+				stream.read(&buffer[i * width], width);
+				if (width < packBitsData.pixMap.rowBytes) {
+					// skip padding and/or clipped bytes
+					stream.seek(packBitsData.pixMap.rowBytes - width, SEEK_CUR);
+				}
+			} else {
+				// TODO: Finish this. Hasn't been needed (yet).
+				error("Unpacked DirectBitsRect data (padded) with bytes per pixel: %d and pixel size: %d", bytesPerPixel, packBitsData.pixMap.pixelSize);
+			}
 		} else if (packBitsData.pixMap.packType == 2) { // Unpacked, No Pad-Byte (on 24-bit)
 			// TODO: Finish this. Hasn't been needed (yet).
 			error("Unpacked DirectBitsRect data (not padded)");
diff --git a/image/pict.h b/image/pict.h
index 77b450f4a2..7fd65c6052 100644
--- a/image/pict.h
+++ b/image/pict.h
@@ -123,6 +123,7 @@ private:
 
 	// Regular-mode Opcodes
 	void setupOpcodesNormal();
+	DECLARE_OPCODE(on_bitsRect);
 	DECLARE_OPCODE(on_packBitsRect);
 	DECLARE_OPCODE(on_directBitsRect);
 	DECLARE_OPCODE(on_compressedQuickTime);