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Delay initialization of fontRenderContext field & co. by moving it into own inner class (#909)

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* git-svn-id: https://svn.apache.org/repos/asf/poi/tags/REL_5_2_3@1904113 13f79535-47bb-0310-9956-ffa450edef68

* Delay loading AWT classes by moving the methods into own class

* Set default value of ignoreMissingFontSystem to true when java.desktop module isn't available

---------

Co-authored-by: PJ Fanning <fanningpj@apache.org>
Co-authored-by: Jaroslav Tulach <jaroslav.tulach@apidesign.org>
This commit is contained in:
Jaroslav Tulach 2025-09-30 10:44:47 +02:00 committed by GitHub
parent 444a8a7214
commit 0a17fa9e22
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1 changed files with 86 additions and 67 deletions
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153
poi/src/main/java/org/apache/poi/ss/util/SheetUtil.java
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@ -93,11 +93,6 @@ public class SheetUtil {
public CellType evaluateFormulaCell(Cell cell) { return cell.getCachedFormulaResultType(); }
};
/**
* drawing context to measure text
*/
private static FontRenderContext fontRenderContext = new FontRenderContext(null, true, true);
/**
* A system property which can be enabled to not fail when the
* font-system is not available on the current machine.
@ -214,13 +209,13 @@ public class SheetUtil {
String txt = line + defaultChar;
AttributedString str = new AttributedString(txt);
copyAttributes(font, str, 0, txt.length());
WithJavaDesktop.copyAttributes(font, str, 0, txt.length());
/*if (rt.numFormattingRuns() > 0) {
// TODO: support rich text fragments
}*/
width = getCellWidth(defaultCharWidth, colspan, style, width, str);
width = WithJavaDesktop.getCellWidth(defaultCharWidth, colspan, style, width, str);
}
}
} else {
@ -238,56 +233,87 @@ public class SheetUtil {
if(sval != null) {
String txt = sval + defaultChar;
AttributedString str = new AttributedString(txt);
copyAttributes(font, str, 0, txt.length());
WithJavaDesktop.copyAttributes(font, str, 0, txt.length());
width = getCellWidth(defaultCharWidth, colspan, style, width, str);
width = WithJavaDesktop.getCellWidth(defaultCharWidth, colspan, style, width, str);
}
}
return width;
}
/**
* Calculate the best-fit width for a cell
* If a merged cell spans multiple columns, evenly distribute the column width among those columns
*
* @param defaultCharWidth the width of a character using the default font in a workbook
* @param colspan the number of columns that is spanned by the cell (1 if the cell is not part of a merged region)
* @param style the cell style, which contains text rotation and indention information needed to compute the cell width
* @param minWidth the minimum best-fit width. This algorithm will only return values greater than or equal to the minimum width.
* @param str the text contained in the cell
* @return the best fit cell width
*/
private static double getCellWidth(float defaultCharWidth, final int colspan,
final CellStyle style, final double minWidth, final AttributedString str) {
TextLayout layout;
try {
layout = new TextLayout(str.getIterator(), fontRenderContext);
} catch (Throwable t) {
if (shouldIgnoreMissingFontSystem(t)) {
return FAILOVER_FUNCTION.apply(defaultCharWidth, colspan, style, minWidth, str);
private static final class WithJavaDesktop {
/**
* drawing context to measure text
*/
private static FontRenderContext fontRenderContext = new FontRenderContext(null, true, true);
/**
* Calculate the best-fit width for a cell
* If a merged cell spans multiple columns, evenly distribute the column width among those columns
*
* @param defaultCharWidth the width of a character using the default font in a workbook
* @param colspan the number of columns that is spanned by the cell (1 if the cell is not part of a merged region)
* @param style the cell style, which contains text rotation and indention information needed to compute the cell width
* @param minWidth the minimum best-fit width. This algorithm will only return values greater than or equal to the minimum width.
* @param str the text contained in the cell
* @return the best fit cell width
*/
private static double getCellWidth(float defaultCharWidth, final int colspan,
final CellStyle style, final double minWidth, final AttributedString str) {
TextLayout layout;
try {
layout = new TextLayout(str.getIterator(), fontRenderContext);
} catch (Throwable t) {
if (shouldIgnoreMissingFontSystem(t)) {
return FAILOVER_FUNCTION.apply(defaultCharWidth, colspan, style, minWidth, str);
}
throw t;
}
throw t;
final Rectangle2D bounds;
if (style.getRotation() != 0) {
/*
* Transform the text using a scale so that its height is increased by a multiple of the leading,
* and then rotate the text before computing the bounds. The scale results in some whitespace around
* the unrotated top and bottom of the text that normally wouldn't be present if unscaled, but
* is added by the standard Excel autosize.
*/
AffineTransform trans = new AffineTransform();
trans.concatenate(AffineTransform.getRotateInstance(style.getRotation()*2.0*Math.PI/360.0));
trans.concatenate(
AffineTransform.getScaleInstance(1, fontHeightMultiple)
);
bounds = layout.getOutline(trans).getBounds();
} else {
bounds = layout.getBounds();
}
// frameWidth accounts for leading spaces which is excluded from bounds.getWidth()
final double frameWidth = bounds.getX() + bounds.getWidth();
return Math.max(minWidth, ((frameWidth / colspan) / defaultCharWidth) + style.getIndention());
}
final Rectangle2D bounds;
if (style.getRotation() != 0) {
/*
* Transform the text using a scale so that its height is increased by a multiple of the leading,
* and then rotate the text before computing the bounds. The scale results in some whitespace around
* the unrotated top and bottom of the text that normally wouldn't be present if unscaled, but
* is added by the standard Excel autosize.
*/
AffineTransform trans = new AffineTransform();
trans.concatenate(AffineTransform.getRotateInstance(style.getRotation()*2.0*Math.PI/360.0));
trans.concatenate(
AffineTransform.getScaleInstance(1, fontHeightMultiple)
);
bounds = layout.getOutline(trans).getBounds();
} else {
bounds = layout.getBounds();
private static float getDefaultCharWidthAsFloat(AttributedString str) {
TextLayout layout = new TextLayout(str.getIterator(), fontRenderContext);
return layout.getAdvance();
}
// frameWidth accounts for leading spaces which is excluded from bounds.getWidth()
final double frameWidth = bounds.getX() + bounds.getWidth();
return Math.max(minWidth, ((frameWidth / colspan) / defaultCharWidth) + style.getIndention());
/**
* Copy text attributes from the supplied Font to Java2D AttributedString
*/
private static void copyAttributes(Font font, AttributedString str, @SuppressWarnings("SameParameterValue") int startIdx, int endIdx) {
str.addAttribute(TextAttribute.FAMILY, font.getFontName(), startIdx, endIdx);
str.addAttribute(TextAttribute.SIZE, (float)font.getFontHeightInPoints());
if (font.getBold()) str.addAttribute(TextAttribute.WEIGHT, TextAttribute.WEIGHT_BOLD, startIdx, endIdx);
if (font.getItalic() ) str.addAttribute(TextAttribute.POSTURE, TextAttribute.POSTURE_OBLIQUE, startIdx, endIdx);
if (font.getUnderline() == Font.U_SINGLE ) str.addAttribute(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON, startIdx, endIdx);
}
private static boolean canComputeColumnWidth(Font font, AttributedString str) {
copyAttributes(font, str, 0, "1w".length());
TextLayout layout = new TextLayout(str.getIterator(), fontRenderContext);
return (layout.getBounds().getWidth() > 0);
}
}
/**
@ -356,10 +382,9 @@ public class SheetUtil {
Font defaultFont = wb.getFontAt( 0);
AttributedString str = new AttributedString(String.valueOf(defaultChar));
copyAttributes(defaultFont, str, 0, 1);
try {
TextLayout layout = new TextLayout(str.getIterator(), fontRenderContext);
return layout.getAdvance();
WithJavaDesktop.copyAttributes(defaultFont, str, 0, 1);
return WithJavaDesktop.getDefaultCharWidthAsFloat(str);
} catch (Throwable t) {
if (shouldIgnoreMissingFontSystem(t)) {
return DEFAULT_CHAR_WIDTH;
@ -456,22 +481,16 @@ public class SheetUtil {
public static boolean canComputeColumnWidth(Font font) {
// not sure what is the best value sample-here, only "1" did not work on some platforms...
AttributedString str = new AttributedString("1w");
copyAttributes(font, str, 0, "1w".length());
TextLayout layout = new TextLayout(str.getIterator(), fontRenderContext);
return (layout.getBounds().getWidth() > 0);
try {
return WithJavaDesktop.canComputeColumnWidth(font, str);
} catch (Throwable t) {
if (shouldIgnoreMissingFontSystem(t)) {
return false;
}
throw t;
}
}
/**
* Copy text attributes from the supplied Font to Java2D AttributedString
*/
private static void copyAttributes(Font font, AttributedString str, @SuppressWarnings("SameParameterValue") int startIdx, int endIdx) {
str.addAttribute(TextAttribute.FAMILY, font.getFontName(), startIdx, endIdx);
str.addAttribute(TextAttribute.SIZE, (float)font.getFontHeightInPoints());
if (font.getBold()) str.addAttribute(TextAttribute.WEIGHT, TextAttribute.WEIGHT_BOLD, startIdx, endIdx);
if (font.getItalic() ) str.addAttribute(TextAttribute.POSTURE, TextAttribute.POSTURE_OBLIQUE, startIdx, endIdx);
if (font.getUnderline() == Font.U_SINGLE ) str.addAttribute(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON, startIdx, endIdx);
}
/**
* Return the cell, without taking account of merged regions.
@ -543,11 +562,11 @@ public class SheetUtil {
}
protected static FontRenderContext getFontRenderContext() {
return fontRenderContext;
return WithJavaDesktop.fontRenderContext;
}
protected static void setFontRenderContext(FontRenderContext fontRenderContext) {
SheetUtil.fontRenderContext = fontRenderContext;
WithJavaDesktop.fontRenderContext = fontRenderContext;
}
private static boolean initIgnoreMissingFontSystemFlag() {