Another video player regression: When the palette changes, look up the

lightest/darkest available colours to use as white/black for the subtitles. It
is possible that we could get away with fixed values for Broken Sword 2, since
it has always had subtitles. But for Broken Sword 1, subtitles is a ScummVM
addition, and we can't.

svn-id: r49154

1 files changed, 32 insertions, 4 deletions

diff --git a/engines/sword1/animation.cpp b/engines/sword1/animation.cpp
index a16f000659..441e622184 100644
--- a/engines/sword1/animation.cpp
+++ b/engines/sword1/animation.cpp
@@ -23,7 +23,6 @@
  *
  */
 
-
 #include "common/file.h"
 #include "sword1/sword1.h"
 #include "sword1/animation.h"
@@ -72,6 +71,9 @@ MoviePlayer::MoviePlayer(SwordEngine *vm, Text *textMan, Audio::Mixer *snd, OSys
 	_bgSoundStream = NULL;
 	_decoderType = decoderType;
 	_decoder = decoder;
+
+	_white = 255;
+	_black = 0;
 }
 
 MoviePlayer::~MoviePlayer() {
@@ -254,9 +256,35 @@ bool MoviePlayer::playVideo() {
 			if (frame)
 				_vm->_system->copyRectToScreen((byte *)frame->pixels, frame->pitch, x, y, frame->w, frame->h);
 
-			if (_decoder->hasDirtyPalette())
+			if (_decoder->hasDirtyPalette()) {
 				_decoder->setSystemPalette();
 
+				uint32 maxWeight = 0;
+				uint32 minWeight = 0xFFFFFFFF;
+				uint32 weight;
+				byte r, g, b;
+				
+				byte *palette = _decoder->getPalette();
+
+				for (int i = 0; i < 256; i++) {
+					r = *palette++;
+					g = *palette++;
+					b = *palette++;
+
+					weight = 3 * r * r + 6 * g * g + 2 * b * b;
+
+					if (weight >= maxWeight) {
+						maxWeight = weight;
+						_white = i;
+					}
+
+					if (weight <= minWeight) {
+						minWeight = weight;
+						_black = i;
+					}
+				}
+			}
+
 			Graphics::Surface *screen = _vm->_system->lockScreen();
 			performPostProcessing((byte *)screen->pixels);
 			_vm->_system->unlockScreen();
@@ -275,11 +303,11 @@ bool MoviePlayer::playVideo() {
 }
 
 byte MoviePlayer::findBlackPalIndex() {
-	return 0;
+	return _black;
 }
 
 byte MoviePlayer::findWhitePalIndex() {
-	return 0xff;
+	return _white;
 }
 
 DXADecoderWithSound::DXADecoderWithSound(Audio::Mixer *mixer, Audio::SoundHandle *bgSoundHandle)