jp.co.cyberagent.android.gpuimage.filter

Class GPUImageNormalBlendFilter

java.lang.Object

jp.co.cyberagent.android.gpuimage.filter.GPUImageFilter

jp.co.cyberagent.android.gpuimage.filter.GPUImageTwoInputFilter

jp.co.cyberagent.android.gpuimage.filter.GPUImageNormalBlendFilter

public class GPUImageNormalBlendFilter
extends GPUImageTwoInputFilter

This equation is a simplification of the general blending equation. It assumes the destination color is opaque, and therefore drops the destination color's alpha term.

D = C1 * C1a + C2 * C2a * (1 - C1a) where D is the resultant color, C1 is the color of the first element, C1a is the alpha of the first element, C2 is the second element color, C2a is the alpha of the second element. The destination alpha is calculated with:

Da = C1a + C2a * (1 - C1a) The resultant color is premultiplied with the alpha. To restore the color to the unmultiplied values, just divide by Da, the resultant alpha.

http://stackoverflow.com/questions/1724946/blend-mode-on-a-transparent-and-semi-transparent-background

For some reason Photoshop behaves D = C1 + C2 * C2a * (1 - C1a)

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	NORMAL_BLEND_FRAGMENT_SHADER

Fields inherited from class jp.co.cyberagent.android.gpuimage.filter.GPUImageFilter

NO_FILTER_FRAGMENT_SHADER, NO_FILTER_VERTEX_SHADER

Constructor Summary

Constructors

Constructor and Description
GPUImageNormalBlendFilter()

Method Summary

Methods inherited from class jp.co.cyberagent.android.gpuimage.filter.GPUImageTwoInputFilter

getBitmap, onDestroy, onDrawArraysPre, onInit, onInitialized, recycleBitmap, setBitmap, setRotation

Methods inherited from class jp.co.cyberagent.android.gpuimage.filter.GPUImageFilter

convertStreamToString, destroy, getAttribPosition, getAttribTextureCoordinate, getOutputHeight, getOutputWidth, getProgram, getUniformTexture, ifNeedInit, isInitialized, loadShader, onDraw, onOutputSizeChanged, runOnDraw, runPendingOnDrawTasks, setFloat, setFloatArray, setFloatVec2, setFloatVec3, setFloatVec4, setInteger, setPoint, setUniformMatrix3f, setUniformMatrix4f

Methods inherited from class java.lang.Object

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

Field Detail

NORMAL_BLEND_FRAGMENT_SHADER

public static final java.lang.String NORMAL_BLEND_FRAGMENT_SHADER

See Also:

Constant Field Values

Constructor Detail

GPUImageNormalBlendFilter

public GPUImageNormalBlendFilter()