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final sclass BWIntegralImage implements MakesBufferedImage, IBWIntegralImage {
int w, h;
int[] data; // 1 entry per pixel
ifdef BWIntegralImage_CountAccesses
long accesses;
endifdef
*() {}
*(File f) { this(loadImage2(f)); }
*(MakesBufferedImage img) { this(toBufferedImage(img)); }
//*(BufferedImage img) { this(BWImage(img)); }
*(BufferedImage image) ctex {
alloc(image.getWidth(), image.getHeight());
// Just grab directly into data array
PixelGrabber pixelGrabber = new PixelGrabber(image, 0, 0, w, h, data, 0, w);
if (!pixelGrabber.grabPixels())
fail("Could not grab pixels");
int sum = 0;
for x to w: {
int packed = data[x];
int brightness = packedToBrightness(packed);
data[x] = (sum += brightness);
}
ifdef BWIntegralImage_useVectorAPI
import jdk.incubator.vector.*;
VectorSpecies species = IntVector.SPECIES_PREFERRED;
int upperBound = species.loopBound(w);
endifdef
int i = w;
for (int y = 1; y < h; y++) {
sum = 0;
ifdef BWIntegralImage_useVectorAPI
int x = 0;
for (; x < upperBound; x += species.length(), i += species.length()) {
for (int sub = 0; sub < species.length(); sub++) {
sum += packedToBrightness(data[i+sub]);
data[i+sub] = sum;
}
IntVector v = IntVector.fromArray(species, data, i);
IntVector v_last = IntVector.fromArray(species, data, i-w);
v = v.add(v_last);
v.intoArray(data, i);
}
for (; x < w; x++, i++) {
int packed = data[i];
int brightness = packedToBrightness(packed);
sum += brightness;
data[i] = sum + data[i-w];
}
endifdef
ifndef BWIntegralImage_useVectorAPI
for x to w: {
int packed = data[i];
int brightness = packedToBrightness(packed);
sum += brightness;
data[i] = sum + data[i-w];
i++;
}
endifndef
} // for y
}
*(BWImage img) {
alloc(img.w(), img.h());
data = new int[w*h];
int i = 0;
for y to h: {
int sum = 0;
for x to w: {
sum += img.getByte(x, y) & 0xFF;
data[i] = y > 0 ? sum + data[i-w] : sum;
i++;
}
}
}
private void alloc(int w, int h) {
this.w = w;
this.h = h;
if (w*h > 8*1024*1024)
fail("Image too large (more than 8 MP): " + w + "*" + h);
data = new int[w*h];
}
// pixels outside of image are considered black
int get(int x, int y) {
ifdef BWIntegralImage_CountAccesses
++accesses;
endifdef
ret x < 0 || y < 0 || x >= w || y >= h ? 0
: data[min(y, h-1)*w+min(x, w-1)];
}
public double getPixelAverage(int x1, int y1, int x2, int y2) {
int area = (x2-x1)*(y2-y1);
ret doubleRatio(bwIntegralImage_sumRect(this, x1, y1, x2, y2), area);
}
int getPixel(int x, int y) {
ret bwIntegralImage_sumRect(this, x, y, x+1, y+1);
}
int getPixel(Pt p) { ret getPixel(p.x, p.y); }
public int getWidth() { ret w; }
public int getHeight() { ret h; }
// unoptimized
public BufferedImage getBufferedImage() {
ret scaleDownUsingIntegralImageBW(this, w).getBufferedImage();
}
int packedToBrightness(int packed) {
int b = (packed & 0xFF);
ifdef BWIntegralImage_brightnessCheat
ret b;
endifdef
ifndef BWIntegralImage_brightnessCheat
int r = ((packed >> 16) & 0xFF);
int g = ((packed >> 8) & 0xFF);
ret (r+g+b+1)/3;
endifndef
}
}