Blend two bitmaps in a new BitmapData, using a blend shader

Hello

I have:

Two images of the same size as bitmap BitmapData.

I want to:

A largest BitmapData, with the two images mixed in a slope like that...

1st row: [BitmapData 1]

2nd row: [BitmapData BitmapData 2 1 mixed up on the top of the page, alpha 0.1]

Row 3: [1 BitmapData with BitmapData 2 mixed up on 0.2, alpha]

Row 4: [1 BitmapData with BitmapData 2 mixed on 0.3, alpha]

....

Line n: [BitmapData [2]

------------------------------------

I can easily implement this using the standard alpha blending. However, I would use my own algorithm of mix, and do it with actionscript is too slow. Therefore, I would like to implement the merge as a Pixel Bender shader function. I came here to make a function that works with the standard alpha blending and no shader custom involved:

protected function createGradientLookupTable( bitmapAtBlend0:BitmapData, bitmapAtBlend1:BitmapData, steps:uint ):BitmapData {
    var gradient:BitmapData = new BitmapData( 256, bitmapAtBlend0.height * steps );
    var translationMatrix:Matrix = new Matrix();
    var alphaTransform:ColorTransform = new ColorTransform();

    for( var row:int = 0; row < steps; row++ ) {
        gradient.draw(bitmapAtBlend0, translationMatrix);
        alphaTransform.alphaMultiplier = row / ( steps - 1 );
        gradient.draw(bitmapAtBlend1, translationMatrix, alphaTransform );
        translationMatrix.translate( 0, bitmapAtBlend0.height );
    }

    return gradient;
}

This method works. At first, I did a fusion of shader to Pixel Bender, just to check if I can load into my Flash Builder project and operate standard alpha. This filter works in Pixel Bender 2.5:

<languageVersion : 1.0;>
kernel BlendHCL
<   namespace : "com.yadayada";
    vendor : "Yada Yada";
    version : 1;
    description : "Blends colors using hue chroma luma";
>
{
    input image4 src1;
    input image4 src2;
    output pixel4 dst;

    parameter float alpha;

    void
    evaluatePixel()
    {
        float4 pixelBottom = sampleNearest(src1,outCoord());
        float4 pixelTop = sampleNearest(src2,outCoord());

        dst = pixelBottom + ( pixelTop - pixelBottom ) * alpha;

    }
}

Don't mind the description etc., currently it's supposed to only must accept a parameter alpha and mix using the standard alpha blending. Just to see I can make it work. Here is my Actionscript code is modified to use the custom mixer, this code does NOT work:

protected function createGradientLookupTable( bitmapAtBlend0:BitmapData, bitmapAtBlend1:BitmapData, steps:uint ):BitmapData {
    var gradient:BitmapData = new BitmapData( 256, bitmapAtBlend0.height * steps );
    var translationMatrix:Matrix = new Matrix();
    var bitmap1:Bitmap = new Bitmap( bitmapAtBlend1 );
    var blendShader:Shader = new Shader( blendShaderCode );

    for( var row:int = 0; row < steps; row++ ) {
        gradient.draw(bitmapAtBlend0, translationMatrix);
        blendShader.data.alpha.value = [ row / ( steps - 1 ) ];
        bitmap1.blendShader = blendShader;
        try {
//            gradient.draw( bitmap1, translationMatrix ); // doesn't work
            gradient.draw( bitmap1, translationMatrix, null, BlendMode.SHADER ); // doesn't work either
        }
        catch( e:Error ) {
            trace( "Error happened! " + e.message ); // No error messages reported
        }
        translationMatrix.translate( 0, bitmapAtBlend0.height );
    }

    return gradient;
}

This code change does not report the errors, it is just as if the alpha is always 1.0. The second image completely replaces the first. This is the expected result if the shader blend is not implemented at all. All the example code that I find using a blend shader, mixes just the colors directly on the screen, not in a new Bitmap or BitmapData object. Can anyone help?

PS: Debugging in Flash Builder 4.7 and inspect the variables indicate that I have an object valid shader (blendShader).

It seems to me I couldn't do it as I wanted. Instead, I created a shader that could create the gradient while only once and actually an object instance ShaderJob in Flash to do the job. Here is the code of the shader which results from:



kernel BlendHCL
<   namespace : "com.yadayada";
    vendor : "Yada Yada";
    version : 1;
    description : "Blends colors using hue chroma luma";
>
{

    input image4 src1;
    input image4 src2;
    output pixel4 dst;

    parameter float imageHeight
    <
        minValue:     1.0;
        maxValue:    64.0;
        defaultValue: 2.0;
        description: "The height of the images that will be blended in the gradient result";
    >;

    parameter float steps
    <
        minValue:      2.0;
        maxValue:   1024.0;
        defaultValue: 64.0;
        description: "The number of shades in the gradient";
    >;

    void
    evaluatePixel()
    {

        float2 sampleCoord = outCoord();

        sampleCoord.y = mod( sampleCoord.y, imageHeight );

        float4 pixelBottom = sampleNearest(src1,sampleCoord);
        float4 pixelTop = sampleNearest(src2,sampleCoord);

        float alpha = floor( outCoord().y / imageHeight ) / ( steps - 1.0 );

        dst = pixelBottom + ( pixelTop - pixelBottom ) * alpha;

    }
}

The following Actionscript code:

          public function createGradientLookupTable(bitmapAtBlend0:BitmapData, bitmapAtBlend1:BitmapData, steps:uint):BitmapData {
               var shader:Shader = new Shader( blendShaderCode );

               shader.data.imageHeight.value = [ Number( bitmapAtBlend0.height ) ];
               shader.data.steps.value = [ Number( steps ) ];

               shader.data.src1.input = bitmapAtBlend0;
               shader.data.src2.input = bitmapAtBlend1;

               var result:BitmapData = new BitmapData( 256, bitmapAtBlend0.height * steps );

               var shaderJob:ShaderJob = new ShaderJob(shader, result);

               shaderJob.start( true );

               return result;

          }

It worked. The shader still conducting a standard alpha blending, but now I go to do the actual shader of coding.

Tags: Flex

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