package me.xiaopan.sketch.process;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import me.xiaopan.sketch.Sketch;
import me.xiaopan.sketch.request.Resize;
/**
* 高斯模糊图片处理器
*/
public class GaussianBlurImageProcessor extends WrappedImageProcessor {
private static final int NO_LAYER_COLOR = -1;
private static final int DEFAULT_RADIUS = 15;
protected String logName = "GaussianBlurImageProcessor";
private int radius; // 模糊半径,取值为0到100
private int layerColor; // 图层颜色,在模糊后的图片上加一层颜色
private GaussianBlurImageProcessor(int radius, int layerColor, WrappedImageProcessor wrappedImageProcessor) {
super(wrappedImageProcessor);
this.radius = radius;
this.layerColor = layerColor;
}
/**
* 创建一个指定半径和图层颜色的高斯模糊图片处理器
*
* @param radius 模糊半径,取值为0到100
* @param layerColor 图层颜色,在模糊后的图片上加一层颜色
* @param wrappedImageProcessor 嵌套一个图片处理器
* @return GaussianBlurImageProcessor
*/
@SuppressWarnings("unused")
public static GaussianBlurImageProcessor make(int radius, int layerColor, WrappedImageProcessor wrappedImageProcessor) {
return new GaussianBlurImageProcessor(radius, layerColor, wrappedImageProcessor);
}
/**
* 创建一个指定半径和图层颜色的高斯模糊图片处理器
*
* @param radius 模糊半径,取值为0到100
* @param layerColor 图层颜色,在模糊后的图片上加一层颜色
* @return GaussianBlurImageProcessor
*/
@SuppressWarnings("unused")
public static GaussianBlurImageProcessor make(int radius, int layerColor) {
return new GaussianBlurImageProcessor(radius, layerColor, null);
}
/**
* 创建一个图层颜色的高斯模糊图片处理器
*
* @param layerColor 图层颜色,在模糊后的图片上加一层颜色
* @param wrappedImageProcessor 嵌套一个图片处理器
* @return GaussianBlurImageProcessor
*/
public static GaussianBlurImageProcessor makeLayerColor(int layerColor, WrappedImageProcessor wrappedImageProcessor) {
return new GaussianBlurImageProcessor(DEFAULT_RADIUS, layerColor, wrappedImageProcessor);
}
/**
* 创建一个图层颜色的高斯模糊图片处理器
*
* @param layerColor 图层颜色,在模糊后的图片上加一层颜色
* @return GaussianBlurImageProcessor
*/
public static GaussianBlurImageProcessor makeLayerColor(int layerColor) {
return new GaussianBlurImageProcessor(DEFAULT_RADIUS, layerColor, null);
}
/**
* 创建一个指定半径的高斯模糊图片处理器
*
* @param radius 模糊半径,取值为0到100
* @param wrappedImageProcessor 嵌套一个图片处理器
* @return GaussianBlurImageProcessor
*/
@SuppressWarnings("unused")
public static GaussianBlurImageProcessor makeRadius(int radius, WrappedImageProcessor wrappedImageProcessor) {
return new GaussianBlurImageProcessor(radius, NO_LAYER_COLOR, wrappedImageProcessor);
}
/**
* 创建一个指定半径的高斯模糊图片处理器
*
* @param radius 模糊半径,取值为0到100
* @return GaussianBlurImageProcessor
*/
@SuppressWarnings("unused")
public static GaussianBlurImageProcessor makeRadius(int radius) {
return new GaussianBlurImageProcessor(radius, NO_LAYER_COLOR, null);
}
/**
* 创建一个半径为15的高斯模糊图片处理器
*
* @param wrappedImageProcessor 嵌套一个图片处理器
* @return GaussianBlurImageProcessor
*/
@SuppressWarnings("unused")
public static GaussianBlurImageProcessor make(WrappedImageProcessor wrappedImageProcessor) {
return new GaussianBlurImageProcessor(DEFAULT_RADIUS, NO_LAYER_COLOR, wrappedImageProcessor);
}
/**
* 创建一个半径为15的高斯模糊图片处理器
*
* @return GaussianBlurImageProcessor
*/
@SuppressWarnings("unused")
public static GaussianBlurImageProcessor make() {
return new GaussianBlurImageProcessor(DEFAULT_RADIUS, NO_LAYER_COLOR, null);
}
/**
* 快速高斯模糊
*/
public static Bitmap fastGaussianBlur(Bitmap sentBitmap, int radius, boolean canReuseInBitmap) {
Bitmap bitmap;
if (canReuseInBitmap) {
bitmap = sentBitmap;
} else {
bitmap = sentBitmap.copy(sentBitmap.getConfig() != null ? sentBitmap.getConfig() : Bitmap.Config.ARGB_8888, true);
}
try {
if (radius < 1) {
return (null);
}
int w = bitmap.getWidth();
int h = bitmap.getHeight();
int[] pix = new int[w * h];
bitmap.getPixels(pix, 0, w, 0, 0, w, h);
int wm = w - 1;
int hm = h - 1;
int wh = w * h;
int div = radius + radius + 1;
int r[] = new int[wh];
int g[] = new int[wh];
int b[] = new int[wh];
int rsum, gsum, bsum, x, y, i, p, yp, yi, yw;
int vmin[] = new int[Math.max(w, h)];
int divsum = (div + 1) >> 1;
divsum *= divsum;
int dv[] = new int[256 * divsum];
for (i = 0; i < 256 * divsum; i++) {
dv[i] = (i / divsum);
}
yw = yi = 0;
int[][] stack = new int[div][3];
int stackpointer;
int stackstart;
int[] sir;
int rbs;
int r1 = radius + 1;
int routsum, goutsum, boutsum;
int rinsum, ginsum, binsum;
for (y = 0; y < h; y++) {
rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
for (i = -radius; i <= radius; i++) {
p = pix[yi + Math.min(wm, Math.max(i, 0))];
sir = stack[i + radius];
sir[0] = (p & 0xff0000) >> 16;
sir[1] = (p & 0x00ff00) >> 8;
sir[2] = (p & 0x0000ff);
rbs = r1 - Math.abs(i);
rsum += sir[0] * rbs;
gsum += sir[1] * rbs;
bsum += sir[2] * rbs;
if (i > 0) {
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
} else {
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
}
}
stackpointer = radius;
for (x = 0; x < w; x++) {
r[yi] = dv[rsum];
g[yi] = dv[gsum];
b[yi] = dv[bsum];
rsum -= routsum;
gsum -= goutsum;
bsum -= boutsum;
stackstart = stackpointer - radius + div;
sir = stack[stackstart % div];
routsum -= sir[0];
goutsum -= sir[1];
boutsum -= sir[2];
if (y == 0) {
vmin[x] = Math.min(x + radius + 1, wm);
}
p = pix[yw + vmin[x]];
sir[0] = (p & 0xff0000) >> 16;
sir[1] = (p & 0x00ff00) >> 8;
sir[2] = (p & 0x0000ff);
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
rsum += rinsum;
gsum += ginsum;
bsum += binsum;
stackpointer = (stackpointer + 1) % div;
sir = stack[(stackpointer) % div];
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
rinsum -= sir[0];
ginsum -= sir[1];
binsum -= sir[2];
yi++;
}
yw += w;
}
for (x = 0; x < w; x++) {
rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
yp = -radius * w;
for (i = -radius; i <= radius; i++) {
yi = Math.max(0, yp) + x;
sir = stack[i + radius];
sir[0] = r[yi];
sir[1] = g[yi];
sir[2] = b[yi];
rbs = r1 - Math.abs(i);
rsum += r[yi] * rbs;
gsum += g[yi] * rbs;
bsum += b[yi] * rbs;
if (i > 0) {
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
} else {
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
}
if (i < hm) {
yp += w;
}
}
yi = x;
stackpointer = radius;
for (y = 0; y < h; y++) {
// Preserve alpha channel: ( 0xff000000 & pix[yi] )
pix[yi] = (0xff000000 & pix[yi]) | (dv[rsum] << 16) | (dv[gsum] << 8) | dv[bsum];
rsum -= routsum;
gsum -= goutsum;
bsum -= boutsum;
stackstart = stackpointer - radius + div;
sir = stack[stackstart % div];
routsum -= sir[0];
goutsum -= sir[1];
boutsum -= sir[2];
if (x == 0) {
vmin[y] = Math.min(y + r1, hm) * w;
}
p = x + vmin[y];
sir[0] = r[p];
sir[1] = g[p];
sir[2] = b[p];
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
rsum += rinsum;
gsum += ginsum;
bsum += binsum;
stackpointer = (stackpointer + 1) % div;
sir = stack[stackpointer];
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
rinsum -= sir[0];
ginsum -= sir[1];
binsum -= sir[2];
yi += w;
}
}
bitmap.setPixels(pix, 0, w, 0, 0, w, h);
return (bitmap);
} catch (Throwable throwable) {
throwable.printStackTrace();
if (bitmap != null && bitmap != sentBitmap) {
bitmap.recycle();
}
return null;
}
}
/**
* 获取模糊半径
*/
@SuppressWarnings("unused")
public int getRadius() {
return radius;
}
/**
* 获取图层颜色
*/
@SuppressWarnings("unused")
public int getLayerColor() {
return layerColor;
}
@Override
public String onGetKey() {
return String.format("%s(radius=%d,maskColor=%d)", logName, radius, layerColor);
}
@Override
public Bitmap onProcess(Sketch sketch, Bitmap bitmap, Resize resize, boolean forceUseResize, boolean lowQualityImage) {
if (bitmap == null || bitmap.isRecycled()) {
return bitmap;
}
// blur handle
Bitmap blurBitmap = fastGaussianBlur(bitmap, radius, bitmap.getConfig() != null && bitmap.isMutable());
// layer color handle
if (blurBitmap != null && layerColor != NO_LAYER_COLOR) {
Canvas canvas = new Canvas(blurBitmap);
canvas.drawColor(layerColor);
}
return blurBitmap;
}
}