protected BufferedImage filterPixelsNN(
BufferedImage dst, int width, int height, int[] inPixels, Rectangle transformedSpace) {
int srcWidth = width;
int srcHeight = height;
int outWidth = transformedSpace.width;
int outHeight = transformedSpace.height;
int outX, outY, srcX, srcY;
int[] outPixels = new int[outWidth];
outX = transformedSpace.x;
outY = transformedSpace.y;
int[] rgb = new int[4];
float[] out = new float[2];
for (int y = 0; y < outHeight; y++) {
for (int x = 0; x < outWidth; x++) {
transformInverse(outX + x, outY + y, out);
srcX = (int) out[0];
srcY = (int) out[1];
// int casting rounds towards zero, so we check out[0] < 0, not srcX < 0
if (out[0] < 0 || srcX >= srcWidth || out[1] < 0 || srcY >= srcHeight) {
int p;
switch (edgeAction) {
case ZERO:
default:
p = 0;
break;
case WRAP:
p =
inPixels[
(ImageMath.mod(srcY, srcHeight) * srcWidth) + ImageMath.mod(srcX, srcWidth)];
break;
case CLAMP:
p =
inPixels[
(ImageMath.clamp(srcY, 0, srcHeight - 1) * srcWidth)
+ ImageMath.clamp(srcX, 0, srcWidth - 1)];
break;
case RGB_CLAMP:
p =
inPixels[
(ImageMath.clamp(srcY, 0, srcHeight - 1) * srcWidth)
+ ImageMath.clamp(srcX, 0, srcWidth - 1)]
& 0x00ffffff;
}
outPixels[x] = p;
} else {
int i = srcWidth * srcY + srcX;
rgb[0] = inPixels[i];
outPixels[x] = inPixels[i];
}
}
setRGB(dst, 0, y, transformedSpace.width, 1, outPixels);
}
return dst;
}
private final int getPixel(int[] pixels, int x, int y, int width, int height) {
if (x < 0 || x >= width || y < 0 || y >= height) {
switch (edgeAction) {
case ZERO:
default:
return 0;
case WRAP:
return pixels[(ImageMath.mod(y, height) * width) + ImageMath.mod(x, width)];
case CLAMP:
return pixels[
(ImageMath.clamp(y, 0, height - 1) * width) + ImageMath.clamp(x, 0, width - 1)];
case RGB_CLAMP:
return pixels[
(ImageMath.clamp(y, 0, height - 1) * width) + ImageMath.clamp(x, 0, width - 1)]
& 0x00ffffff;
}
}
return pixels[y * width + x];
}
@Override
protected void transformInverse(int x, int y, float[] out) {
float dx = x - icentreX;
float dy = y - icentreY;
float theta = (float) Math.atan2(-dy, -dx) + angle;
float r = (float) Math.sqrt(dx * dx + dy * dy);
theta = ImageMath.mod(theta, 2 * (float) Math.PI);
out[0] = iWidth * theta / (spreadAngle + 0.00001f);
out[1] = iHeight * (1 - (r - radius) / (height + 0.00001f));
}