public final Class PNGFileFormat

SWT does not support 16-bit depth color formats. Convert the 16-bit data to 8-bit data. The correct way to do this is to multiply each 16 bit value by the value: (2^8 - 1) / (2^16 - 1). The fast way to do this is just to drop the low byte of the 16-bit value.

SWT does not support 16-bit depth color formats. Convert the 16-bit data to 8-bit data. The correct way to do this is to multiply each 16 bit value by the value: (2^8 - 1) / (2^16 - 1). The fast way to do this is just to drop the low byte of the 16-bit value.

PNG supports four filtering types. These types are applied per row of image data. This method unfilters the given row based on the filterType.

Fire an event to let listeners know that an interlaced frame has been loaded. finalFrame should be true if the image has finished loading, false if there are more frames to come.

Answer the number of bytes in a word-aligned row of pixel data.

Answer the number of bytes needed to represent a pixel. This value depends on the image's color type and bit depth. Note that this method rounds up if an image's pixel size isn't byte-aligned.

Answer the number of bytes in each row of the image data. Each PNG row is byte-aligned, so images with bit depths less than a byte may have unused bits at the end of each row. The value of these bits is undefined.

Answer the number of bytes in a row of the given pixel width. Each row is byte-aligned, so images with bit depths less than a byte may have unused bits at the end of each row. The value of these bits is undefined.

Implements abstract org.eclipse.swt.internal.image.FileFormat.isFileFormat.

Doc from org.eclipse.swt.internal.image.FileFormat.isFileFormat.

Return whether or not the specified input stream represents a supported file format.

Annotations

@Override

Implements abstract org.eclipse.swt.internal.image.FileFormat.loadFromByteStream.

Load the PNG image from the byte stream.

Annotations

@Override

Read the pixel data for an interlaced image from the data stream.

1. Read one of the seven frames of interlaced data. 2. Update the imageData. 3. Notify the image loader's listeners of the frame load.

Read and handle the next chunk of data from the PNG file.

Read the pixel data for a non-interlaced image from the data stream. Update the imageData to reflect the new data.

Read the image data from the data stream. This must handle decoding the data, filtering, and interlacing.

Skip over signature data. This has already been verified in isFileFormat().

PNG supports some color types and bit depths that are unsupported by SWT. If the image uses an unsupported color type (either of the gray scale types) or bit depth (16), convert the data to an SWT-supported format. Then assign the data into the ImageData given.

SWT does not support greyscale as a color type. For plain grayscale, we create a palette. For Grayscale with Alpha, however, we need to convert the pixels to use RGB values.

Implements abstract org.eclipse.swt.internal.image.FileFormat.unloadIntoByteStream.

Annotations

@Override

SWT does not support 16-bit depths. If this image uses 16-bit depths, convert the data to an 8-bit depth.