How to create Watermarks using Foxit PDF SDK (C++)

A watermark is a type of PDF annotation and is widely used in PDF documents. A watermark is a visible embedded overlay on a document consisting of text, a logo, or a copyright notice. The purpose of a watermark is to brand your work and discourage its unauthorized use. Foxit PDF SDK provides APIs to work with watermarks, allowing applications to create, insert, release and remove watermarks.

Example:

How to create a text watermark and insert it into the first page

#include "include/common/fs_common.h"#include "include/pdf/fs_pdfdoc.h"#include "include/pdf/fs_pdfpage.h"#include "include/pdf/fs_watermark.h"using namespace foxit;using namespace foxit::common;using foxit::common::Library;using namespace pdf;...// Assuming PDFDoc doc has been loaded.WatermarkSettings settings;settings.flags = WatermarkSettings::e_FlagASPageContents | WatermarkSettings::e_FlagOnTop;settings.offset_x = 0;settings.offset_y = 0;settings.opacity = 90;settings.position = common::e_PosTopRight;settings.rotation = -45.f;settings.scale_x = 1.f;settings.scale_y = 1.f;WatermarkTextProperties text_properties;text_properties.alignment = CommonDefines::e_AlignmentCenter;text_properties.color = 0xF68C21;text_properties.font_style = WatermarkTextProperties::e_FontStyleNormal;text_properties.line_space = 1;text_properties.font_size = 12.f;text_properties.font = Font(Font::e_StdIDTimesB);Watermark watermark(doc, L"Foxit PDF SDK\nwww.foxit.com", text_properties, settings);watermark.InsertToPage(doc.GetPage(0));// Save document to file...

How to create an image watermark and insert it into the first page

#include "include/common/fs_common.h"#include "include/pdf/fs_pdfdoc.h"#include "include/pdf/fs_pdfpage.h"#include "include/pdf/fs_watermark.h"using namespace foxit;using namespace foxit::common;using foxit::common::Library;using namespace pdf;...// Assuming PDFDoc doc has been loaded.WatermarkSettings settings;settings.flags = WatermarkSettings::e_FlagASPageContents | WatermarkSettings::e_FlagOnTop;settings.offset_x = 0.f;settings.offset_y = 0.f;settings.opacity = 20;settings.position = common::e_PosCenter;settings.rotation = 0.0f;Image image(image_file);Bitmap bitmap = image.GetFrameBitmap(0);settings.scale_x = page.GetWidth() * 0.618f / bitmap.GetWidth();settings.scale_y = settings.scale_x;Watermark watermark(doc, image, 0, settings);watermark.InsertToPage(doc.GetPage(0));// Save document to file....

How to remove all watermarks from a page

#include "include/common/fs_common.h"#include "include/pdf/fs_pdfdoc.h"#include "include/pdf/fs_pdfpage.h"using namespace foxit;using namespace foxit::common;using foxit::common::Library;using namespace pdf;...// Assuming PDFPage page has been loaded and parsed....page.RemoveAllWatermarks();...// Save document to file...