com.softwareag.mobile.runtime.media

Class PngParser

java.lang.Object

com.softwareag.mobile.runtime.media.PngParser

public class PngParser
extends java.lang.Object

Creates Images from raw pixel data via the PNG file format

Field Summary

Fields

Modifier and Type	Field and Description
static int[]	crc_table If needed, this will be filled with a handy CRC lookup table

Constructor Summary

Constructors

Constructor and Description
PngParser()

Method Summary

Methods

Modifier and Type	Method and Description
static int	pngCalcAdler(byte[] buffer, int end, int length, int block_size) Returns the Adler-checksum value for a block of byte data - checksum will run from buffer[end-length] to buffer[end]
static int	pngCalcCrc(byte[] buffer, int end, int length) Returns the CRC value for a block of byte data - checksum will run from buffer[end-length] to buffer[end]
static void	pngCalcCrcTable() Creates a CRC-table for quick reference purposes
static byte[]	pngCreateByteArray(int image_width, int image_height, byte[] argb_image) Creates the byte-array PNG representation from pixel argb data
static byte[]	pngCreateByteArray(int image_width, int image_height, int[] argb_image) Creates the byte-array PNG representation from pixel argb data
static byte[]	pngCreateByteArray(int image_width, int image_height, int bit_depth, byte[] argb_palette, byte[] image, boolean already_idat_format) Creates the byte-array PNG representation from pixel data
static javax.microedition.lcdui.Image	pngCreateImage(int image_width, int image_height, byte[] argb_image) Creates an Image from pixel argb data, using the PNG file format (instead of createRGBImage, which doesn't exist under MIDP1, so isn't always accessible)
static javax.microedition.lcdui.Image	pngCreateImage(int image_width, int image_height, int bit_depth, byte[] argb_palette, byte[] image, boolean already_idat_format) Creates an Image from pixel data, using the PNG file format
static javax.microedition.lcdui.Image	pngMakeMutable(javax.microedition.lcdui.Image img) Creates a mutable version of this image

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

crc_table

public static int[] crc_table

If needed, this will be filled with a handy CRC lookup table

Constructor Detail

PngParser

public PngParser()

Method Detail

pngCreateByteArray

public static byte[] pngCreateByteArray(int image_width,
                        int image_height,
                        int[] argb_image)

Creates the byte-array PNG representation from pixel argb data

Parameters:

image_width - pixel width

image_height - pixel height

argb_image - argb pixel entries, in the format supplied by Image.getRGB

pngCreateByteArray

public static byte[] pngCreateByteArray(int image_width,
                        int image_height,
                        byte[] argb_image)

Creates the byte-array PNG representation from pixel argb data

Parameters:

image_width - pixel width

image_height - pixel height

argb_image - a/r/g/b pixel entries

pngCreateByteArray

public static byte[] pngCreateByteArray(int image_width,
                        int image_height,
                        int bit_depth,
                        byte[] argb_palette,
                        byte[] image,
                        boolean already_idat_format)

Creates the byte-array PNG representation from pixel data

Parameters:

image_width - pixel width

image_height - pixel height

bit_depth - bit_depth (must be 1, 2, 4 or 8)

argb_palette - a/r/g/b palette entries (for transparent index, it should always be index 0)

image - indexed image data

already_idat_format - image data is a preformatted IDAT chunk, otherwise it's just pixel data

pngCreateImage

public static javax.microedition.lcdui.Image pngCreateImage(int image_width,
                                            int image_height,
                                            byte[] argb_image)

Creates an Image from pixel argb data, using the PNG file format (instead of createRGBImage, which doesn't exist under MIDP1, so isn't always accessible)

Parameters:

image_width - pixel width

image_height - pixel height

argb_image - a/r/g/b pixel entries

pngCreateImage

public static javax.microedition.lcdui.Image pngCreateImage(int image_width,
                                            int image_height,
                                            int bit_depth,
                                            byte[] argb_palette,
                                            byte[] image,
                                            boolean already_idat_format)

Creates an Image from pixel data, using the PNG file format

Parameters:

image_width - pixel width

image_height - pixel height

bit_depth - bit_depth (must be 1, 2, 4 or 8)

argb_palette - a/r/g/b palette entries (for transparent index, it should always be index 0)

image - indexed image data

already_idat_format - image data is a preformatted IDAT chunk, otherwise it's just pixel data

pngCalcAdler

public static int pngCalcAdler(byte[] buffer,
               int end,
               int length,
               int block_size)

Returns the Adler-checksum value for a block of byte data - checksum will run from buffer[end-length] to buffer[end]

pngCalcCrc

public static int pngCalcCrc(byte[] buffer,
             int end,
             int length)

Returns the CRC value for a block of byte data - checksum will run from buffer[end-length] to buffer[end]

pngCalcCrcTable

public static void pngCalcCrcTable()

Creates a CRC-table for quick reference purposes

pngMakeMutable

public static javax.microedition.lcdui.Image pngMakeMutable(javax.microedition.lcdui.Image img)

Creates a mutable version of this image