page.py 文件源码

def __render_img(self, size, pdf_page=None):
        # TODO(Jflesch): In a perfect world, we shouldn't use ImageSurface.
        # we should draw directly on the GtkImage.window.cairo_create()
        # context. It would be much more efficient.

        logger.debug('Building img from pdf: {}'.format(size))

        if pdf_page is None:
            pdf_page = self.pdf_page

        base_size = self.get_base_size(pdf_page)

        width = int(size[0])
        height = int(size[1])
        factor_w = width / base_size[0]
        factor_h = height / base_size[1]

        surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
        ctx = cairo.Context(surface)
        ctx.scale(factor_w, factor_h)
        pdf_page.render(ctx)
        return surface2image(surface)