ACCESS: Fix crash in the introduction sequence

engines/access/amazon/amazon_logic.cpp

@@ -148,7 +148,7 @@ void CampScene::mWhileDoOpen() {
 		_vm->_animation->animate(0);
 		_vm->_animation->animate(1);
 		pan();
-		_vm->_buffer2.blitFrom(_vm->_buffer1);
+		_vm->_buffer2.copyFrom(_vm->_buffer1);
 		_vm->_newRects.clear();
 		_vm->plotList();
 		_vm->copyBlocks();
@@ -176,8 +176,8 @@ void CampScene::mWhileDoOpen() {
 	}
 
 	events.showCursor();
-	_vm->_buffer2.blitFrom(*_vm->_screen);
-	_vm->_buffer1.blitFrom(*_vm->_screen);
+	_vm->_buffer2.copyFrom(*_vm->_screen);
+	_vm->_buffer1.copyFrom(*_vm->_screen);
 
 	_vm->freeCells();
 	_vm->_oldRects.clear();
@@ -323,8 +323,8 @@ void Opening::doTitle() {
 		_vm->_files->_setPaletteFlag = false;
 		_vm->_files->loadScreen(0, 3);
 
-		_vm->_buffer2.blitFrom(*_vm->_screen);
-		_vm->_buffer1.blitFrom(*_vm->_screen);
+		_vm->_buffer2.copyFrom(*_vm->_screen);
+		_vm->_buffer1.copyFrom(*_vm->_screen);
 		screen.forceFadeIn();
 		_vm->_sound->playSound(1);
 
@@ -347,8 +347,8 @@ void Opening::doTitle() {
 		_vm->_files->loadScreen(0, 4);
 		_vm->_sound->playSound(1);
 
-		_vm->_buffer2.blitFrom(*_vm->_screen);
-		_vm->_buffer1.blitFrom(*_vm->_screen);
+		_vm->_buffer2.copyFrom(*_vm->_screen);
+		_vm->_buffer1.copyFrom(*_vm->_screen);
 		_vm->_sound->playSound(1);
 
 		const int COUNTDOWN[6] = { 2, 0x80, 1, 0x7d, 0, 0x87 };

engines/access/asurface.cpp

@@ -253,6 +253,7 @@ void ASurface::transBlitFrom(ASurface &src) {
 }
 
 void ASurface::blitFrom(Graphics::Surface &src) {
+	assert(w >= src.w && h >= src.h);
 	for (int y = 0; y < src.h; ++y) {
 		const byte *srcP = (const byte *)src.getBasePtr(0, y);
 		byte *destP = (byte *)getBasePtr(0, y);