Package org.apache.pdfbox.pdmodel.graphics.shading

Class TriangleBasedShadingContext

java.lang.Object

org.apache.pdfbox.pdmodel.graphics.shading.ShadingContext

org.apache.pdfbox.pdmodel.graphics.shading.TriangleBasedShadingContext

All Implemented Interfaces:

PaintContext

Direct Known Subclasses:

GouraudShadingContext, PatchMeshesShadingContext

abstract class TriangleBasedShadingContext
extends ShadingContext

Intermediate class extended by the shading types 4,5,6 and 7 that contains the common methods used by these classes.

Field Summary

Fields

Modifier and Type	Field	Description
private int[][]	pixelTableArray
private int	xOffset
private int	yOffset

Constructor Summary

Constructors

Constructor	Description
TriangleBasedShadingContext(PDShading shading, ColorModel cm, AffineTransform xform, Matrix matrix)	Constructor.

Method Summary

Modifier and Type	Method	Description
private void	addLinePoints(Line line, int[][] array)
private void	addValueToArray(Point p, int value, int[][] array)
(package private) abstract Map<Point,Integer>	calcPixelTable(Rectangle deviceBounds)	Deprecated. the map was replaced with an array due to a better performance
protected int[][]	calcPixelTable(List<ShadedTriangle> triangleList, int[][] array, Rectangle deviceBounds)	Get the points from the triangles, calculate their color and add point-color mappings.
protected void	calcPixelTable(List<ShadedTriangle> triangleList, Map<Point,Integer> map, Rectangle deviceBounds)	Deprecated. the map was replaced with an array due to a better performance
(package private) abstract int[][]	calcPixelTableArray(Rectangle deviceBounds)	Calculate every point and its color and store them in a two-dimensional array.
protected final void	createPixelTable(Rectangle deviceBounds)	Creates the pixel table.
private int	evalFunctionAndConvertToRGB(float[] values)	Convert color to RGB color value, using function if required, then convert from the shading color space to an RGB value, which is encoded into an integer.
final Raster	getRaster(int x, int y, int w, int h)
private int	getValueFromArray(int x, int y)
(package private) abstract boolean	isDataEmpty()	Returns true if the shading has an empty data stream.

Methods inherited from class org.apache.pdfbox.pdmodel.graphics.shading.ShadingContext

convertToRGB, dispose, getBackground, getColorModel, getRgbBackground, getShading, getShadingColorSpace

Methods inherited from class java.lang.Object

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

Field Details

pixelTableArray

private int[][] pixelTableArray

xOffset

private int xOffset

yOffset

private int yOffset

Constructor Details

TriangleBasedShadingContext

TriangleBasedShadingContext(PDShading shading,
 ColorModel cm,
 AffineTransform xform,
 Matrix matrix)
                     throws IOException

Constructor.

Parameters:

shading - the shading type to be used

cm - the color model to be used

xform - transformation for user to device space

matrix - the pattern matrix concatenated with that of the parent content stream

Throws:

IOException - if there is an error getting the color space or doing background color conversion.

Method Details

createPixelTable

protected final void createPixelTable(Rectangle deviceBounds)
                               throws IOException

Creates the pixel table.

Throws:

IOException

calcPixelTable

@Deprecated
abstract Map<Point,Integer> calcPixelTable(Rectangle deviceBounds)
                                    throws IOException

Deprecated.

the map was replaced with an array due to a better performance

Calculate every point and its color and store them in a Hash table.

Returns:

a Hash table which contains all the points' positions and colors of one image

Throws:

IOException

calcPixelTableArray

abstract int[][] calcPixelTableArray(Rectangle deviceBounds)
                              throws IOException

Calculate every point and its color and store them in a two-dimensional array.

Returns:

an array which contains all the points' positions and colors of one image

Throws:

IOException

calcPixelTable

@Deprecated
protected void calcPixelTable(List<ShadedTriangle> triangleList,
 Map<Point,Integer> map,
 Rectangle deviceBounds)
                       throws IOException

Deprecated.

the map was replaced with an array due to a better performance

Get the points from the triangles, calculate their color and add point-color mappings.

Throws:

IOException

calcPixelTable

protected int[][] calcPixelTable(List<ShadedTriangle> triangleList,
 int[][] array,
 Rectangle deviceBounds)
                          throws IOException

Get the points from the triangles, calculate their color and add point-color mappings.

Throws:

IOException

addLinePoints

private void addLinePoints(Line line,
 int[][] array)
                    throws IOException

Throws:

IOException

addValueToArray

private void addValueToArray(Point p,
 int value,
 int[][] array)

getValueFromArray

private int getValueFromArray(int x,
 int y)

evalFunctionAndConvertToRGB

private int evalFunctionAndConvertToRGB(float[] values)
                                 throws IOException

Convert color to RGB color value, using function if required, then convert from the shading color space to an RGB value, which is encoded into an integer.

Throws:

IOException

isDataEmpty

abstract boolean isDataEmpty()

Returns true if the shading has an empty data stream.

getRaster

public final Raster getRaster(int x,
 int y,
 int w,
 int h)