Method GetFrame

src/effects/Bars.cpp:48–98

This method is required for all derived classes of EffectBase, and returns a modified openshot::Frame object

// This method is required for all derived classes of EffectBase, and returns a
// modified openshot::Frame object
std::shared_ptr<openshot::Frame> Bars::GetFrame(std::shared_ptr<openshot::Frame> frame, int64_t frame_number)
{
	// Get the frame's image
	std::shared_ptr<QImage> frame_image = frame->GetImage();

	// Get bar color (and create small color image)
	auto tempColor = std::make_shared<QImage>(
		frame_image->width(), 1, QImage::Format_RGBA8888_Premultiplied);
	tempColor->fill(QColor(QString::fromStdString(color.GetColorHex(frame_number))));

	// Get current keyframe values
	double left_value = left.GetValue(frame_number);
	double top_value = top.GetValue(frame_number);
	double right_value = right.GetValue(frame_number);
	double bottom_value = bottom.GetValue(frame_number);

	// Get pixel array pointer
	unsigned char *pixels = (unsigned char *) frame_image->bits();
	unsigned char *color_pixels = (unsigned char *) tempColor->bits();

	// Get pixels sizes of all bars
	int top_bar_height = top_value * frame_image->height();
	int bottom_bar_height = bottom_value * frame_image->height();
	int left_bar_width = left_value * frame_image->width();
	int right_bar_width = right_value * frame_image->width();

	// Loop through rows
	for (int row = 0; row < frame_image->height(); row++) {

		// Top & Bottom Bar
		if ((top_bar_height > 0.0 && row <= top_bar_height) || (bottom_bar_height > 0.0 && row >= frame_image->height() - bottom_bar_height)) {
			memcpy(&pixels[row * frame_image->width() * 4], color_pixels, sizeof(char) * frame_image->width() * 4);
		} else {
			// Left Bar
			if (left_bar_width > 0.0) {
				memcpy(&pixels[row * frame_image->width() * 4], color_pixels, sizeof(char) * left_bar_width * 4);
			}

			// Right Bar
			if (right_bar_width > 0.0) {
				memcpy(&pixels[((row * frame_image->width()) + (frame_image->width() - right_bar_width)) * 4], color_pixels, sizeof(char) * right_bar_width * 4);
			}
		}
	}

	// Cleanup colors and arrays
	tempColor.reset();

	// return the modified frame
	return frame;
}

// Generate JSON string of this object
std::string Bars::Json() const {