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feat: adjust text padding multiplier and refine kerning calculations

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Balázs Szücs 2025-07-14 01:30:45 +02:00
parent d7ed471e5d
commit 03e252f9e8
1 changed files with 14 additions and 4 deletions
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18
stirling-pdf/src/main/java/stirling/software/SPDF/controller/api/security/RedactController.java
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@ -68,7 +68,7 @@ import stirling.software.common.util.propertyeditor.StringToArrayListPropertyEdi
@RequiredArgsConstructor @RequiredArgsConstructor
public class RedactController { public class RedactController {
private static final float DEFAULT_TEXT_PADDING_MULTIPLIER = 0.3f; private static final float DEFAULT_TEXT_PADDING_MULTIPLIER = 0.6f;
private static final float PRECISION_THRESHOLD = 1e-3f; private static final float PRECISION_THRESHOLD = 1e-3f;
private static final int FONT_SCALE_FACTOR = 1000; private static final int FONT_SCALE_FACTOR = 1000;
@ -1189,14 +1189,23 @@ public class RedactController {
newArray.add(new COSString(newText)); newArray.add(new COSString(newText));
if (segment.getFontSize() > 0) { if (segment.getFontSize() > 0) {
float adjustmentFactor = float adjustmentFactor = 1.05f;
1.2f; // Increase adjustment by 20% to compensate for spaces
float kerning = float kerning =
-1 -1
* adjustment * adjustment
* adjustmentFactor * adjustmentFactor
* (FONT_SCALE_FACTOR / segment.getFontSize()); * (FONT_SCALE_FACTOR / segment.getFontSize());
// Cap kerning value to prevent extreme outliers that mangle text
float maxKerning = 500f;
if (Math.abs(kerning) > maxKerning) {
log.warn(
"Kerning value {} is an outlier. Capping to {}.",
kerning,
kerning > 0 ? maxKerning : -maxKerning);
kerning = Math.max(-maxKerning, Math.min(maxKerning, kerning));
}
newArray.add(new org.apache.pdfbox.cos.COSFloat(kerning)); newArray.add(new org.apache.pdfbox.cos.COSFloat(kerning));
log.debug( log.debug(
"Applied kerning adjustment: {} for width adjustment: {}", "Applied kerning adjustment: {} for width adjustment: {}",
@ -1279,7 +1288,8 @@ public class RedactController {
float adjustment = originalWidth - modifiedWidth; float adjustment = originalWidth - modifiedWidth;
if (Math.abs(adjustment) > PRECISION_THRESHOLD) { if (Math.abs(adjustment) > PRECISION_THRESHOLD) {
float adjustmentFactor = 0.8f; float adjustmentFactor = 1.05f; // Increase kerning, visually more
// natural
float kerning = float kerning =
-1 -1
* adjustment * adjustment