Method _update

scene/resources/gradient_texture.cpp:96–148

}

void GradientTexture1D::_update() const {
	update_pending = false;

	if (gradient.is_null()) {
		return;
	}

	if (use_hdr) {
		// High dynamic range.
		Ref<Image> image = memnew(Image(width, 1, false, Image::FORMAT_RGBAF));
		Gradient &g = **gradient;
		// `create()` isn't available for non-uint8_t data, so fill in the data manually.
		for (int i = 0; i < width; i++) {
			float ofs = float(i) / (width - 1);
			image->set_pixel(i, 0, g.get_color_at_offset(ofs));
		}

		if (texture.is_valid()) {
			RID new_texture = RS::get_singleton()->texture_2d_create(image);
			RS::get_singleton()->texture_replace(texture, new_texture);
		} else {
			texture = RS::get_singleton()->texture_2d_create(image);
		}
	} else {
		// Low dynamic range. "Overbright" colors will be clamped.
		Vector<uint8_t> data;
		data.resize(width * 4);
		{
			uint8_t *wd8 = data.ptrw();
			Gradient &g = **gradient;

			for (int i = 0; i < width; i++) {
				float ofs = float(i) / (width - 1);
				Color color = g.get_color_at_offset(ofs);

				wd8[i * 4 + 0] = uint8_t(CLAMP(color.r * 255.0, 0, 255));
				wd8[i * 4 + 1] = uint8_t(CLAMP(color.g * 255.0, 0, 255));
				wd8[i * 4 + 2] = uint8_t(CLAMP(color.b * 255.0, 0, 255));
				wd8[i * 4 + 3] = uint8_t(CLAMP(color.a * 255.0, 0, 255));
			}
		}

		Ref<Image> image = memnew(Image(width, 1, false, Image::FORMAT_RGBA8, data));

		if (texture.is_valid()) {
			RID new_texture = RS::get_singleton()->texture_2d_create(image);
			RS::get_singleton()->texture_replace(texture, new_texture);
		} else {
			texture = RS::get_singleton()->texture_2d_create(image);
		}
	}
	RS::get_singleton()->texture_set_path(texture, get_path());
}

void GradientTexture1D::set_width(int p_width) {
	ERR_FAIL_COND_MSG(p_width <= 0 || p_width > 16384, "Texture dimensions have to be within 1 to 16384 range.");