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Watermark opacity (#76)

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This commit is contained in:
Anthony Stirling
2023-03-24 13:30:26 +00:00
committed by GitHub
parent 472082cb03
commit f866c8a61f
9 changed files with 58 additions and 3 deletions
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13
src/main/java/stirling/software/SPDF/controller/security/WatermarkController.java
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@@ -26,6 +26,7 @@ import org.springframework.web.multipart.MultipartFile;
import stirling.software.SPDF.utils.PdfUtils;
import stirling.software.SPDF.utils.WatermarkRemover;
import org.apache.pdfbox.pdmodel.graphics.state.PDExtendedGraphicsState;
@Controller
public class WatermarkController {
@@ -45,7 +46,8 @@ public class WatermarkController {
@PostMapping("/add-watermark")
public ResponseEntity<byte[]> addWatermark(@RequestParam("fileInput") MultipartFile pdfFile, @RequestParam("watermarkText") String watermarkText,
@RequestParam(defaultValue = "30", name = "fontSize") float fontSize, @RequestParam(defaultValue = "0", name = "rotation") float rotation,
@RequestParam(defaultValue = "50", name = "widthSpacer") int widthSpacer, @RequestParam(defaultValue = "50", name = "heightSpacer") int heightSpacer)
@RequestParam(defaultValue = "0.5", name = "opacity") float opacity,
@RequestParam(defaultValue = "50", name = "widthSpacer") int widthSpacer, @RequestParam(defaultValue = "50", name = "heightSpacer") int heightSpacer)
throws IOException {
// Load the input PDF
@@ -53,9 +55,18 @@ public class WatermarkController {
// Create a page in the document
for (PDPage page : document.getPages()) {
// Get the page's content stream
PDPageContentStream contentStream = new PDPageContentStream(document, page, PDPageContentStream.AppendMode.APPEND, true);
// Set transparency
PDExtendedGraphicsState graphicsState = new PDExtendedGraphicsState();
graphicsState.setNonStrokingAlphaConstant(opacity);
contentStream.setGraphicsStateParameters(graphicsState);
// Set font of watermark
PDFont font = PDType1Font.HELVETICA_BOLD;
contentStream.beginText();