import android.graphics.Bitmap; import android.graphics.Color; public class LomoFilter { public static Bitmap filter(Bitmap bitmap){ int width = bitmap.getWidth(); int height = bitmap.getHeight(); int dst[] = new int[width*height]; bitmap.getPixels(dst, 0, width, 0, 0, width, height); int ratio = width > height ? height*32768/width : width*32768/height; int cx = width >> 1; int cy = height >> 1; int max = cx * cx + cy * cy; int min = (int) (max * (1 - 0.8f)); int diff = max - min; int ri, gi, bi; int dx, dy, distSq, v; int R, G, B; int value; int pos, pixColor; int newR, newG, newB; for(int y=0; y<height; y++){ for(int x=0; x<width; x++){ pos = y*width + x; pixColor = dst[pos]; R = Color.red(pixColor); G = Color.green(pixColor); B = Color.blue(pixColor); value = R<128 ? R : 256-R; newR = (value*value*value)/64/256; newR = (R<128 ? newR : 255-newR); value = G<128 ? G : 256-G; newG = (value*value)/128; newG = (G<128 ? newG : 255-newG); newB = B/2 + 0x25; //==========边缘黑暗==============// dx = cx - x; dy = cy - y; if (width > height) dx = (dx * ratio) >> 15; else dy = (dy * ratio) >> 15; distSq = dx * dx + dy * dy; if (distSq > min){ v = ((max - distSq) << 8) / diff; v *= v; ri = (int)(newR * v) >> 16; gi = (int)(newG * v) >> 16; bi = (int)(newB * v) >> 16; newR = ri > 255 ? 255 : (ri < 0 ? 0 : ri); newG = gi > 255 ? 255 : (gi < 0 ? 0 : gi); newB = bi > 255 ? 255 : (bi < 0 ? 0 : bi); } //==========边缘黑暗end==============// dst[pos] = Color.rgb(newR, newG, newB); } } Bitmap acrossFlushBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565); acrossFlushBitmap.setPixels(dst, 0, width, 0, 0, width, height); return acrossFlushBitmap; } }