C++ VideoDecoder::hasDirtyPalette方法代码示例

bool VideoManager::drawNextFrame(VideoEntryPtr videoEntry) {
	Video::VideoDecoder *video = videoEntry->_video;
	const Graphics::Surface *frame = video->decodeNextFrame();

	if (!frame || !videoEntry->isEnabled()) {
		return false;
	}

	Graphics::Surface *convertedFrame = nullptr;
	Graphics::PixelFormat pixelFormat = _vm->_system->getScreenFormat();

	if (frame->format != pixelFormat) {
		// We don't support downconverting to 8bpp without having
		// support in the codec. Set _enableDither if shows up.
		if (pixelFormat.bytesPerPixel == 1) {
			warning("Cannot convert high color video frame to 8bpp");
			return false;
		}

		// Convert to the current screen format
		convertedFrame = frame->convertTo(pixelFormat, video->getPalette());
		frame = convertedFrame;
	} else if (pixelFormat.bytesPerPixel == 1 && video->hasDirtyPalette()) {
		// Set the palette when running in 8bpp mode only
		// Don't do this for Myst, which has its own per-stack handling
		if (_vm->getGameType() != GType_MYST)
			_vm->_system->getPaletteManager()->setPalette(video->getPalette(), 0, 256);
	}

	// Clip the video to make sure it stays on the screen (Myst does this a few times)
	Common::Rect targetRect = Common::Rect(video->getWidth(), video->getHeight());
	targetRect.translate(videoEntry->getX(), videoEntry->getY());

	Common::Rect frameRect = Common::Rect(video->getWidth(), video->getHeight());

	if (targetRect.left < 0) {
		frameRect.left -= targetRect.left;
		targetRect.left = 0;
	}

	if (targetRect.top < 0) {
		frameRect.top -= targetRect.top;
		targetRect.top = 0;
	}

	if (targetRect.right > _vm->_system->getWidth()) {
		frameRect.right -= targetRect.right - _vm->_system->getWidth();
		targetRect.right = _vm->_system->getWidth();
	}

	if (targetRect.bottom > _vm->_system->getHeight()) {
		frameRect.bottom -= targetRect.bottom - _vm->_system->getHeight();
		targetRect.bottom = _vm->_system->getHeight();
	}

	_vm->_system->copyRectToScreen(frame->getBasePtr(frameRect.left, frameRect.top), frame->pitch,
	                               targetRect.left, targetRect.top, targetRect.width(), targetRect.height());

	// Delete 8bpp conversion surface
	if (convertedFrame) {
		convertedFrame->free();
		delete convertedFrame;
	}

	// We've drawn something to the screen, make sure we update it
	return true;
}

bool VideoManager::updateMovies() {
	bool updateScreen = false;

	for (VideoList::iterator it = _videos.begin(); it != _videos.end(); ) {
		// Check of the video has reached the end
		if ((*it)->endOfVideo()) {
			if ((*it)->isLooping()) {
				// Seek back if looping
				(*it)->seek((*it)->getStart());
			} else {
				// Done; close and continue on
				(*it)->close();
				it = _videos.erase(it);
				continue;
			}
		}

		Video::VideoDecoder *video = (*it)->_video;

		// Ignore paused videos
		if (video->isPaused()) {
			it++;
			continue;
		}

		// Check if we need to draw a frame
		if (video->needsUpdate()) {
			const Graphics::Surface *frame = video->decodeNextFrame();
			Graphics::Surface *convertedFrame = 0;

			if (frame && (*it)->isEnabled()) {
				Graphics::PixelFormat pixelFormat = _vm->_system->getScreenFormat();

				if (frame->format != pixelFormat) {
					// We don't support downconverting to 8bpp without having
					// support in the codec. Set _enableDither if shows up.
					if (pixelFormat.bytesPerPixel == 1) {
						warning("Cannot convert high color video frame to 8bpp");
						(*it)->close();
						it = _videos.erase(it);
						continue;
					}

					// Convert to the current screen format
					convertedFrame = frame->convertTo(pixelFormat, video->getPalette());
					frame = convertedFrame;
				} else if (pixelFormat.bytesPerPixel == 1 && video->hasDirtyPalette()) {
					// Set the palette when running in 8bpp mode only
					// Don't do this for Myst, which has its own per-stack handling
					if (_vm->getGameType() != GType_MYST)
						_vm->_system->getPaletteManager()->setPalette(video->getPalette(), 0, 256);
				}

				// Clip the width/height to make sure we stay on the screen (Myst does this a few times)
				uint16 width = MIN<int32>(video->getWidth(), _vm->_system->getWidth() - (*it)->getX());
				uint16 height = MIN<int32>(video->getHeight(), _vm->_system->getHeight() - (*it)->getY());
				_vm->_system->copyRectToScreen(frame->getPixels(), frame->pitch, (*it)->getX(), (*it)->getY(), width, height);

				// We've drawn something to the screen, make sure we update it
				updateScreen = true;

				// Delete 8bpp conversion surface
				if (convertedFrame) {
					convertedFrame->free();
					delete convertedFrame;
				}
			}
		}

		// Check the video time
		_vm->doVideoTimer(*it, false);

		// Remember to increase the iterator
		it++;
	}

	// Return true if we need to update the screen
	return updateScreen;
}