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DrawRectFilter.javaAPI DocAndroid 5.1 API3979Thu Mar 12 22:22:30 GMT 2015android.filterpacks.imageproc

DrawRectFilter

public class DrawRectFilter extends android.filterfw.core.Filter
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Fields Summary
private float
mColorRed
private float
mColorGreen
private float
mColorBlue
private final String
mVertexShader
private final String
mFixedColorFragmentShader
private android.filterfw.core.ShaderProgram
mProgram
Constructors Summary
public DrawRectFilter(String name)



       
        super(name);
Methods Summary
public android.filterfw.core.FrameFormatgetOutputFormat(java.lang.String portName, android.filterfw.core.FrameFormat inputFormat)

        return inputFormat;
public voidprepare(android.filterfw.core.FilterContext context)

        mProgram = new ShaderProgram(context, mVertexShader, mFixedColorFragmentShader);
public voidprocess(android.filterfw.core.FilterContext env)

        // Get input frame
        Frame imageFrame = pullInput("image");
        Frame boxFrame = pullInput("box");

        // Get the box
        Quad box = (Quad)boxFrame.getObjectValue();
        box = box.scaled(2.0f).translated(-1.0f, -1.0f);

        // Create output frame with copy of input
        GLFrame output = (GLFrame)env.getFrameManager().duplicateFrame(imageFrame);

        // Draw onto output
        output.focus();
        renderBox(box);

        // Push output
        pushOutput("image", output);

        // Release pushed frame
        output.release();
private voidrenderBox(android.filterfw.geometry.Quad box)

        final int FLOAT_SIZE = 4;

        // Get current values
        float[] color = {mColorRed, mColorGreen, mColorBlue, 1f};
        float[] vertexValues = { box.p0.x, box.p0.y,
                                 box.p1.x, box.p1.y,
                                 box.p3.x, box.p3.y,
                                 box.p2.x, box.p2.y };

        // Set the program variables
        mProgram.setHostValue("color", color);
        mProgram.setAttributeValues("aPosition", vertexValues, 2);
        mProgram.setVertexCount(4);

        // Draw
        mProgram.beginDrawing();
        GLES20.glLineWidth(1.0f);
        GLES20.glDrawArrays(GLES20.GL_LINE_LOOP, 0, 4);
public voidsetupPorts()

        addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA,
                                                       FrameFormat.TARGET_GPU));
        addMaskedInputPort("box", ObjectFormat.fromClass(Quad.class, FrameFormat.TARGET_SIMPLE));
        addOutputBasedOnInput("image", "image");