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Aspose.Slides for Java 25.8 Release Notes

This page contains release notes for Aspose.Slides for Java 25.8

Key	Summary	Category	Related Documentation
SLIDESNET-45029	Alt text of images is missing when converting PPTX to PDF	Enhancement	https://docs.aspose.com/slides/net/convert-powerpoint-to-pdf/
SLIDESNET-45000	Inserting Excel charts as editable charts in a presentation	Feature
SLIDESNET-45010	Setting the typeface of the major and minor fonts in the master theme’s font scheme	Feature
SLIDESNET-45031	Extracting brightness and contrast properties of an image	Feature
SLIDESNET-45020	Adding HTML content immediately after an object	Enhancement	https://docs.aspose.com/slides/net/import-presentation/#import-powerpoint-from-html
SLIDESNET-45049	Preserve comment hierarchy when cloning slides with modern comments	Feature	https://docs.aspose.com/slides/net/clone-slides/
SLIDESNET-45054	Extracting closed captions from audios	Feature	https://docs.aspose.com/slides/net/audio-frame/
SLIDESNET-44984	Text layout problems with Chaparral Pro font when converting a slide to an image	Enhancement	https://docs.aspose.com/slides/net/convert-slide/
SLIDESJAVA-39573	Use Aspose.Slides for Net 25.8 features	Enhancement
SLIDESJAVA-39682	Alt text of images is missing when converting PPTX to PDF	Enhancement	https://docs.aspose.com/slides/java/convert-powerpoint-to-pdf/
SLIDESJAVA-39691	Legend Items of Pie chart are unnecessarily wrapped in PPTX to PDF conversion	Bug	https://docs.aspose.com/slides/java/convert-powerpoint-to-pdf/
SLIDESJAVA-39643	PDF conversion of a 5MB PPTX file consumes more than 1GB of memory	Enhancement	https://docs.aspose.com/slides/java/convert-powerpoint-to-pdf/

Public API Changes

Added New Property: CaptionTracks

The new property, CaptionTracks, has been added to the IAudioFrame interface and implemented in the AudioFrame class. This property returns a collection containing all caption tracks.

The following sample code shows how to insert a new AudioFrame, add captions to it, and save the PowerPoint presentation:

Presentation pres = new Presentation();
try {
    IAudio audio = pres.getAudios().addAudio(new FileInputStream("audio.mp3"), LoadingStreamBehavior.KeepLocked);
    IAudioFrame audioFrame = pres.getSlides().get_Item(0).getShapes().addAudioFrameEmbedded(10, 10, 50, 50, audio);

    // Adds the new captions track from file
    audioFrame.getCaptionTracks().add("New track", "track.vtt");

    pres.save("audio with captions.pptx", SaveFormat.Pptx);
} finally {
    if (pres != null) pres.dispose();
}

The following example demonstrates how to extract captions from the AudioFrame on the first slide and save them to files:

Presentation pres = new Presentation("audio with captions.pptx");
try {
    for (IShape shape : pres.getSlides().get_Item(0).getShapes())
    {
        if (shape instanceof IAudioFrame )
        {
            IAudioFrame audioFrame = (IAudioFrame) shape;
            for (ICaptions captionTrack : audioFrame.getCaptionTracks())
            {
                // Saves the caption track's binary data as a .vtt file
                FileOutputStream fos = new FileOutputStream(captionTrack.getCaptionId() + ".vtt");
                fos.write(captionTrack.getBinaryData());
                fos.close();
            }
        }
    }
} finally {
    if (pres != null) pres.dispose();
}

The following example shows how to remove all captions from an AudioFrame and save the PowerPoint presentation:

Presentation pres = new Presentation("audio with captions.pptx");
try {
    IAudioFrame audioFrame = (IAudioFrame) pres.getSlides().get_Item(0).getShapes().get_Item(0);

    // Removes all captions from the AudioFrame
    audioFrame.getCaptionTracks().clear();

    pres.save("audio without captions.pptx", SaveFormat.Pptx);
} finally {
    if (pres != null) pres.dispose();
}

Added New Methods: IFonts.GetScriptFontMap, IFonts.GetScriptFont, IFonts.SetScriptFont and IFonts.RemoveScriptFont

New methods getScriptFontMap, getScriptFont, setScriptFont and removeScriptFont added to IFonts interface and its implementation. These enhancements allow developers to programmatically access, set, remove, and list font mappings for different script tags (e.g., Latn, Cyrl, Jpan) following the BCP-47 script code standard. These APIs are particularly useful for customizing font behavior in multilingual presentations. For example, when working with East Asian, Arabic, Hebrew, or Devanagari scripts, it’s now possible to apply precise font control to match branding or localization requirements.

Code example:

Presentation pres = new Presentation(pptxFileName);
try {
    Dictionary<String, String> scriptFontMap = pres.getMasterTheme().getFontScheme().getMajor().getScriptFontMap();
    for (KeyValuePair<String, String> kvp : scriptFontMap)
    {
        System.out.println(kvp.getKey() + " ? " + kvp.getValue());
    }

    System.out.println(pres.getMasterTheme().getFontScheme().getMajor().getScriptFont("Thaa"));

    pres.getMasterTheme().getFontScheme().getMajor().setScriptFont("Thaa", "Super Thaa");
    pres.getMasterTheme().getFontScheme().getMinor().removeScriptFont("Geor");
} finally {
    if (pres != null) pres.dispose();
}

Added New Methods: SlideUtil.FindShapesByPlaceholderType and SlideUtil.GetTextBoxesContainsText

In previous versions of Aspose.Slides for Java, there were cases, when adding placeholders from a layout to a slide, the placeholder text was copied along with its shape. Since this behavior does not match that of PowerPoint, starting from Aspose.Slides for Java 25.8, this inconsistency has been corrected. The new getTextBoxesContainsText and findShapesByPlaceholderType methods have been added to the SlideUtil class to make it easier to switch to the new version.

Usage examples:

If you previously used the SlideUtil.getAllTextBoxes(IBaseSlide slide) method to search for specific text in all slide shapes, including placeholders, for example like this:

Presentation presentation = new Presentation();
try {
    ISlide slide = presentation.getSlides().addEmptySlide(presentation.getLayoutSlides().get_Item(0));
    for (ITextFrame textFrame : SlideUtil.getAllTextBoxes(slide))
    {
        if (textFrame.getText().contains("test text"))
            textFrame.setText("The new test text!");
    }
} finally {
    if (presentation != null) presentation.dispose();
}

then you can now use the SlideUtil.getTextBoxesContainsText(IBaseSlide slide, String text, boolean checkPlaceholderText) method with checkPlaceholderText = true to achieve the same functionality:

Presentation presentation = new Presentation();
try {
    ISlide slide = presentation.getSlides().addEmptySlide(presentation.getLayoutSlides().get_Item(0));
    for (ITextFrame textFrame : SlideUtil.getTextBoxesContainsText(slide, "test text", true))
    {
        textFrame.setText("The new test text!");
    }
} finally {
    if (presentation != null) presentation.dispose();
}

The following example demonstrates how to find all “Text” placeholders on a slide:

Presentation presentation = new Presentation(filePath);
try {
    for (IShape shape : SlideUtil.findShapesByPlaceholderType(presentation.getSlides().get_Item(0), PlaceholderType.Body))
    {
        switch (shape.getPlaceholder().getOrientation())
        {
            case Orientation.Vertical:
                ((IAutoShape)shape).getTextFrame().setText("This is a Text (Vertical) placeholder.");
                continue;
            case Orientation.Horizontal:
                ((IAutoShape)shape).getTextFrame().setText("This is a Text placeholder.");
                continue;
        }
    }
} finally {
    if (presentation != null) presentation.dispose();
}

Implemented Brightness and Contrast Effect reading

Added IBrightnessContrast interface and its implementation BrightnessContrast class

The BrightnessContrast represents BrightnessContrast effect, which allows you to adjust brightness and contrast.

Added IBrightnessContrastEffectiveData interface and its implementation BrightnessContrastEffectiveData class

The BrightnessContrastEffectiveData is an immutable object which represents a BrightnessContrast effect.

Added AddBrightnessContrastEffect(float brightness, float contrast) method to the IImageTransformOperationCollection interface and to its implementation ImageTransformOperationCollection class

This method adds the new BrightnessContrast effect to the end of a collection. The brightness is the percent to change the brightness, the contrast is the percent to change the contrast. The method returns the index of the new image effect in a collection.

The following sample code shows how to use new interfaces and classes. Please note that the current implementation doesn’t allow to change brightness and contrast values, the effect is not implemented and cannot be applied. It allows to get brightness and contrast values of BrightnessContrast effect if they are present.

Presentation presentation = new Presentation(pathToPresentation);
try {
    ISlide slide = presentation.getSlides().get_Item(0);
    IPictureFrame pictureFrame = (IPictureFrame)(slide.getShapes().get_Item(0));
    IImageTransformOperationCollection imageTransform = pictureFrame.getPictureFormat().getPicture().getImageTransform();
    for (IImageTransformOperation effect : imageTransform)
    {
        if (effect instanceof IBrightnessContrast)
        {
            IBrightnessContrast brightnessContrast = (IBrightnessContrast)effect;
            IBrightnessContrastEffectiveData brightnessContrastData = brightnessContrast.getEffective();
            float brightness = brightnessContrastData.getBrightness();
            float contrast = brightnessContrastData.getContrast();
            //...
        }
    }
} finally {
    if (presentation != null) presentation.dispose();
}

Implemented the ability to extract data from Excel tables and use it in PowerPoint presentations

The following interfaces and classes have been added:

IExcelDataWorkbook, ExcelDataWorkbook
IExcelDataCell, ExcelDataCell

Unlike the ChartDataWorkbook, which is designed specifically to handle data used in charts and is tightly integrated with chart-related functionality, the newly introduced types - ExcelDataWorkbook and related classes - offer a more flexible and general-purpose approach to accessing data from Excel workbooks. These types provide read-only access to Excel content, enabling developers to retrieve values from cells, access worksheet names, and interact with Excel structures.

Added IExcelDataWorkbook interface and ExcelDataWorkbook class

The ExcelDataWorkbook class provides functionality to load an Excel workbook from a file path or stream. It offers several overloads for retrieving data cells.

Added IExcelDataCell interface and ExcelDataCell class

The ExcelDataCell class represents a single cell in an Excel workbook. It exposes properties such as cell name, position, and value.

The following example demonstrates how to extract a value from a cell:

IExcelDataWorkbook wb = new ExcelDataWorkbook("TestWorkbook.xlsx");
IExcelDataCell cell = wb.getCell("Sheet1", "B2");
System.out.println(cell.getValue());

The following example demonstrates how to retrieve worksheet names and chart names from an Excel workbook:

ExcelDataWorkbook workbook = new ExcelDataWorkbook("excelfile.xlsx");
List<String> sheetNames = workbook.getWorksheetNames();
for (String name : sheetNames)
{
    System.out.println("Worksheet " + name + " has the following charts:");

    Dictionary<Integer, String> sheetCharts = workbook.getChartsFromWorksheet(name);
    for (KeyValuePair<Integer, String> chart : sheetCharts)
        System.out.println(chart.getKey() + " - " + chart.getValue());
}

Support for importing charts from an Excel workbook into a presentation

The new ExcelWorkbookImporter class has been added. It provides functionality for importing content from an Excel workbook into a presentation.

The following example demonstrates how to import all charts from an Excel workbook to a presentation. Only the chart data will be embedded:

ExcelDataWorkbook workbook = new ExcelDataWorkbook("excelfile.xlsx");
Presentation pres = new Presentation();
try {
    ILayoutSlide blankLayout = pres.getLayoutSlides().getByType(SlideLayoutType.Blank);

    List<String> worksheetNames = workbook.getWorksheetNames();
    for (String name : worksheetNames)
    {
        Dictionary<Integer, String> worksheetCharts = workbook.getChartsFromWorksheet(name);
        for (KeyValuePair<Integer, String> chart : worksheetCharts)
        {
            ISlide slide = pres.getSlides().addEmptySlide(blankLayout);
            ExcelWorkbookImporter.addChartFromWorkbook(slide.getShapes(), 10, 10, workbook, name, chart.getKey(), false);
        }
    }

    pres.save("result.pptx", SaveFormat.Pptx);
} finally {
    if (pres != null) pres.dispose();
}

The following example demonstrates how to import the chart from a workbook file by its name and worksheet name. The chart will link to the external workbook:

Presentation pres = new Presentation();
try {
    ExcelWorkbookImporter.addChartFromWorkbook(pres.getSlides().get_Item(0).getShapes(), 10, 10, "excelfile.xlsx", "worksheet name", "chart name", false);
    pres.save("result.pptx", SaveFormat.Pptx);
} finally {
    if (pres != null) pres.dispose();
}

The following code demonstrates how to import the chart from a workbook stream by its name and worksheet name. The entire workbook will be embedded in the chart:

FileInputStream fStream = new FileInputStream("excelfile.xlsx");
Presentation pres = new Presentation();
try {
    ExcelWorkbookImporter.addChartFromWorkbook(pres.getSlides().get_Item(0).getShapes(), 10, 10, fStream, "worksheet name", "chart name", true);
    pres.save("result.pptx", SaveFormat.Pptx);
} finally {
    if (pres != null) pres.dispose();
    fStream.close();
}