/*
* HaoRan ImageFilter Classes v0.3
* Copyright (C) 2012 Zhenjun Dai
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation.
*/
package com.marshalchen.common.uimodule.ImageFilter.Distort;
import android.graphics.Color;
import com.marshalchen.common.uimodule.ImageFilter.*;
public class BilinearDistort implements IImageFilter{
Image clone;
BilinearDistort(){};
double[] calc_undistorted_coord (int x, int y, double un_x, double un_y){
return new double[]{un_x, un_y};
}
boolean IsInside (int width , int height, int x, int y) {
return (x>=0) && (x<width) && (y>=0) && (y<height);
}
static int GetBilinear (double x, double y, int[] colors)
{
int[] px0 = new int[3];
px0[0] = (colors[0] & 0xFF0000)>>16;
px0[1] = (colors[0] & 0x00FF00)>>8;
px0[2] = colors[0] & 0x0000FF;
int[] px1 = new int[3];
px1[0] = (colors[1] & 0xFF0000)>>16;
px1[1] = (colors[1] & 0x00FF00)>>8;
px1[2] = colors[1] & 0x0000FF;
int[] px2 = new int[3];
px2[0] = (colors[2] & 0xFF0000)>>16;
px2[1] = (colors[2] & 0x00FF00)>>8;
px2[2] = colors[2] & 0x0000FF;
int[] px3 = new int[3];
px3[0] = (colors[3] & 0xFF0000)>>16;
px3[1] = (colors[3] & 0x00FF00)>>8;
px3[2] = colors[3] & 0x0000FF;
int[] crRet = new int[3];
for (int i=0 ; i < 3 ; i++)
{
double m0 = px0[i] + x * (px1[i] - px0[i]);
double m1 = px2[i] + x * (px3[i] - px2[i]);
double my = m0 + y * (m1 - m0) ;
crRet[i] = Image.SAFECOLOR((int)my) ;
}
return Color.rgb(crRet[0], crRet[1], crRet[2]);
}
//@Override
public Image process(Image imageIn) {
clone = imageIn.clone();
int width = imageIn.getWidth();
int height = imageIn.getHeight();
for(int x = 0 ; x < width; x++){
for(int y = 0 ; y < height ; y++){
double un_x = 0, un_y = 0 ;
double[] result = calc_undistorted_coord (x, y, un_x, un_y) ;
un_x = result[0];un_y = result[1];
int crNull = Color.WHITE;
int cr = crNull ;
if ( (un_x > -1) && (un_x < width) && (un_y > -1) && (un_y < height) )
{
// only this range is valid
int nSrcX = ((un_x < 0) ? -1 : (int)un_x);
int nSrcY = ((un_y < 0) ? -1 : (int)un_y);
int nSrcX_1 = nSrcX + 1;
int nSrcY_1 = nSrcY + 1;
int[] color = new int[4];
color[0] = IsInside(width, height, nSrcX, nSrcY) ? clone.getPixelColor(nSrcX,nSrcY) : crNull;
color[1] = IsInside(width, height, nSrcX_1, nSrcY) ? clone.getPixelColor(nSrcX_1,nSrcY) : crNull;
color[2] = IsInside(width, height, nSrcX, nSrcY_1) ? clone.getPixelColor(nSrcX,nSrcY_1) : crNull;
color[3] = IsInside(width, height, nSrcX_1, nSrcY_1) ? clone.getPixelColor(nSrcX_1,nSrcY_1) : crNull;
cr = GetBilinear(un_x-nSrcX, un_y-nSrcY, color);
}
imageIn.setPixelColor(x, y, cr);
}
}
return imageIn;
}
}