Method Open

src/ImageReader.cpp:35–82

Open image file

// Open image file
void ImageReader::Open()
{
	// Open reader if not already open
	if (!is_open)
	{
		// Attempt to open file
		try
		{
			// load image
			image = std::make_shared<Magick::Image>(path);

			// Give image a transparent background color
			image->backgroundColor(Magick::Color("none"));
			MAGICK_IMAGE_ALPHA(image, true);
		}
		catch (const Magick::Exception& e) {
			// raise exception
			throw InvalidFile("ImageReader could not open image file.", path);
		}

		// Update image properties
		info.has_audio = false;
		info.has_video = true;
		info.has_single_image = true;
		info.file_size = image->fileSize();
		info.vcodec = image->format();
		info.width = image->size().width();
		info.height = image->size().height();
		info.pixel_ratio = openshot::Fraction(1, 1);
		info.fps = openshot::Fraction(30, 1);
		info.video_timebase = info.fps.Reciprocal();
		// Default still-image duration: 1 hour, aligned to fps
		info.video_length = 60 * 60 * info.fps.num; // 3600 seconds * 30 fps
		info.duration = static_cast<float>(info.video_length / info.fps.ToDouble());

		// Calculate the DAR (display aspect ratio)
		Fraction dar(
			info.width * info.pixel_ratio.num,
			info.height * info.pixel_ratio.den);

		// Reduce DAR fraction & set ratio
		dar.Reduce();
		info.display_ratio = dar;

		// Mark as "open"
		is_open = true;
	}
}

void ImageReader::Close()
{