When drawing an interlaced frame, only clear every other line instead of the

entire buffer.

Introduced a _drawBuffer pointer which points either to _scaledBuffer or
_frameBuffer1. That way, we don't need to copy _frameBuffer1 every time we
draw an unscaled frame. (Probably the most common case by far.)

Adjusted the Broken Sword 1 DXA player for the second change. (It sneakily
avoids copying each frame by using _drawBuffer directly.)

svn-id: r24846

1 files changed, 2 insertions, 2 deletions

diff --git a/engines/sword1/animation.cpp b/engines/sword1/animation.cpp
index 498f185f70..afe9a13bd1 100644
--- a/engines/sword1/animation.cpp
+++ b/engines/sword1/animation.cpp
@@ -348,9 +348,9 @@ void MoviePlayerDXA::processFrame(void) {
 }
 
 void MoviePlayerDXA::updateScreen(void) {
-	// Using _scaledBuffer directly should work, as long as we don't do any
+	// Using _drawBuffer directly should work, as long as we don't do any
 	// post-processing of the frame.
-	_sys->copyRectToScreen(_scaledBuffer, _frameWidth, _frameX, _frameY, _frameWidth, _frameHeight);
+	_sys->copyRectToScreen(_drawBuffer, _frameWidth, _frameX, _frameY, _frameWidth, _frameHeight);
 	_sys->updateScreen();
 }