1 files changed, 139 insertions, 0 deletions
diff --git a/image/codecs/msvideo1.cpp b/image/codecs/msvideo1.cpp
new file mode 100644
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--- /dev/null
+++ b/image/codecs/msvideo1.cpp
@@ -0,0 +1,139 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+ // Based off ffmpeg's msvideo.cpp
+
+#include "image/codecs/msvideo1.h"
+#include "common/stream.h"
+#include "common/textconsole.h"
+
+namespace Image {
+
+#define CHECK_STREAM_PTR(n) \
+  if ((stream.pos() + n) > stream.size() ) { \
+	warning ("MS Video-1: Stream out of bounds (%d >= %d)", stream.pos() + n, stream.size()); \
+    return; \
+  }
+
+MSVideo1Decoder::MSVideo1Decoder(uint16 width, uint16 height, byte bitsPerPixel) : Codec() {
+	_surface = new Graphics::Surface();
+	// TODO: Specify the correct pixel format for 2Bpp mode.
+	_surface->create(width, height, (bitsPerPixel == 8) ? Graphics::PixelFormat::createFormatCLUT8() : Graphics::PixelFormat(2, 0, 0, 0, 0, 0, 0, 0, 0));
+	_bitsPerPixel = bitsPerPixel;
+}
+
+MSVideo1Decoder::~MSVideo1Decoder() {
+	_surface->free();
+	delete _surface;
+}
+
+void MSVideo1Decoder::decode8(Common::SeekableReadStream &stream) {
+    byte colors[8];
+    byte *pixels = (byte *)_surface->getPixels();
+    uint16 stride = _surface->w;
+
+    int skipBlocks = 0;
+    uint16 blocks_wide = _surface->w / 4;
+    uint16 blocks_high = _surface->h / 4;
+    uint32 totalBlocks = blocks_wide * blocks_high;
+    uint32 blockInc = 4;
+    uint16 rowDec = stride + 4;
+
+    for (uint16 block_y = blocks_high; block_y > 0; block_y--) {
+        uint32 blockPtr = (block_y * 4 - 1) * stride;
+        for (uint16 block_x = blocks_wide; block_x > 0; block_x--) {
+            // check if this block should be skipped
+            if (skipBlocks > 0) {
+                blockPtr += blockInc;
+                skipBlocks--;
+                totalBlocks--;
+                continue;
+            }
+
+            uint32 pixelPtr = blockPtr;
+
+            /* get the next two bytes in the encoded data stream */
+            CHECK_STREAM_PTR(2);
+            byte byte_a = stream.readByte();
+            byte byte_b = stream.readByte();
+
+            /* check if the decode is finished */
+            if (byte_a == 0 && byte_b == 0 && totalBlocks == 0) {
+                return;
+            } else if ((byte_b & 0xFC) == 0x84) {
+                // skip code, but don't count the current block
+                skipBlocks = ((byte_b - 0x84) << 8) + byte_a - 1;
+            } else if (byte_b < 0x80) {
+                // 2-color encoding
+                uint16 flags = (byte_b << 8) | byte_a;
+
+                CHECK_STREAM_PTR(2);
+                colors[0] = stream.readByte();
+                colors[1] = stream.readByte();
+
+                for (byte pixel_y = 0; pixel_y < 4; pixel_y++) {
+                    for (byte pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
+                        pixels[pixelPtr++] = colors[(flags & 0x1) ^ 1];
+                    pixelPtr -= rowDec;
+                }
+            } else if (byte_b >= 0x90) {
+                // 8-color encoding
+                uint16 flags = (byte_b << 8) | byte_a;
+
+                CHECK_STREAM_PTR(8);
+				for (byte i = 0; i < 8; i++)
+					colors[i] = stream.readByte();
+
+                for (byte pixel_y = 0; pixel_y < 4; pixel_y++) {
+                    for (byte pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
+                        pixels[pixelPtr++] = colors[((pixel_y & 0x2) << 1) + (pixel_x & 0x2) + ((flags & 0x1) ^ 1)];
+                    pixelPtr -= rowDec;
+                }
+            } else {
+                // 1-color encoding
+                colors[0] = byte_a;
+
+                for (byte pixel_y = 0; pixel_y < 4; pixel_y++) {
+                    for (byte pixel_x = 0; pixel_x < 4; pixel_x++)
+                        pixels[pixelPtr++] = colors[0];
+                    pixelPtr -= rowDec;
+                }
+            }
+
+            blockPtr += blockInc;
+            totalBlocks--;
+        }
+    }
+}
+
+const Graphics::Surface *MSVideo1Decoder::decodeFrame(Common::SeekableReadStream &stream) {
+	if (_bitsPerPixel == 8)
+		decode8(stream);
+	else {
+    //	decode16(stream);
+		error ("Unhandled MS Video-1 16bpp encoding");
+	}
+
+    return _surface;
+}
+
+} // End of namespace Image