Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.awt.Color;

import java.awt.image.BufferedImage;

import java.awt.image.DataBufferInt;

public class Main {
    private static void applyShadow(BufferedImage image, int shadowSize, Color shadowColor, float shadowOpacity) {
        int dstWidth = image.getWidth();
        int dstHeight = image.getHeight();

        int left = (shadowSize - 1) >> 1;
        int right = shadowSize - left;
        int xStart = left;
        int xStop = dstWidth - right;
        int yStart = left;
        int yStop = dstHeight - right;

        int shadowRgb = shadowColor.getRGB() & 0x00FFFFFF;

        int[] aHistory = new int[shadowSize];
        int historyIdx = 0;

        int aSum;

        int[] dataBuffer = ((DataBufferInt) image.getRaster().getDataBuffer()).getData();
        int lastPixelOffset = right * dstWidth;
        float sumDivider = shadowOpacity / shadowSize;

        // horizontal pass

        for (int y = 0, bufferOffset = 0; y < dstHeight; y++, bufferOffset = y * dstWidth) {
            aSum = 0;
            historyIdx = 0;
            for (int x = 0; x < shadowSize; x++, bufferOffset++) {
                int a = dataBuffer[bufferOffset] >>> 24;
                aHistory[x] = a;
                aSum += a;
            }

            bufferOffset -= right;

            for (int x = xStart; x < xStop; x++, bufferOffset++) {
                int a = (int) (aSum * sumDivider);
                dataBuffer[bufferOffset] = a << 24 | shadowRgb;

                // substract the oldest pixel from the sum
                aSum -= aHistory[historyIdx];

                // get the lastest pixel
                a = dataBuffer[bufferOffset + right] >>> 24;
                aHistory[historyIdx] = a;
                aSum += a;

                if (++historyIdx >= shadowSize) {
                    historyIdx -= shadowSize;
                }
            }
        }

        // vertical pass
        for (int x = 0, bufferOffset = 0; x < dstWidth; x++, bufferOffset = x) {
            aSum = 0;
            historyIdx = 0;
            for (int y = 0; y < shadowSize; y++, bufferOffset += dstWidth) {
                int a = dataBuffer[bufferOffset] >>> 24;
                aHistory[y] = a;
                aSum += a;
            }

            bufferOffset -= lastPixelOffset;

            for (int y = yStart; y < yStop; y++, bufferOffset += dstWidth) {
                int a = (int) (aSum * sumDivider);
                dataBuffer[bufferOffset] = a << 24 | shadowRgb;

                // substract the oldest pixel from the sum
                aSum -= aHistory[historyIdx];

                // get the lastest pixel
                a = dataBuffer[bufferOffset + lastPixelOffset] >>> 24;
                aHistory[historyIdx] = a;
                aSum += a;

                if (++historyIdx >= shadowSize) {
                    historyIdx -= shadowSize;
                }
            }
        }
    }
}