1 /*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "filters.h"
18
interp(unsigned char * src,int p,int * off,float dr,float dg,float db)19 __inline__ int interp(unsigned char *src, int p , int *off ,float dr,float dg, float db){
20
21 float fr00 = (src[p+off[0]])*(1-dr)+(src[p+off[1]])*dr;
22 float fr01 = (src[p+off[2]])*(1-dr)+(src[p+off[3]])*dr;
23 float fr10 = (src[p+off[4]])*(1-dr)+(src[p+off[5]])*dr;
24 float fr11 = (src[p+off[6]])*(1-dr)+(src[p+off[7]])*dr;
25 float frb0 = fr00 * (1-db)+fr01*db;
26 float frb1 = fr10 * (1-db)+fr11*db;
27 float frbg = frb0 * (1-dg)+frb1*dg;
28
29 return (int)frbg ;
30 }
31
JNIFUNCF(ImageFilterFx,nativeApplyFilter,jobject bitmap,jint width __unused,jint height __unused,jobject lutbitmap,jint lutwidth,jint lutheight,jint start,jint end)32 void JNIFUNCF(ImageFilterFx, nativeApplyFilter, jobject bitmap, jint width __unused,
33 jint height __unused, jobject lutbitmap, jint lutwidth, jint lutheight,
34 jint start, jint end)
35 {
36 char* destination = 0;
37 char* lut = 0;
38 AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
39 AndroidBitmap_lockPixels(env, lutbitmap, (void**) &lut);
40 unsigned char * rgb = (unsigned char * )destination;
41 unsigned char * lutrgb = (unsigned char * )lut;
42 int lutdim_r = lutheight;
43 int lutdim_g = lutheight;;
44 int lutdim_b = lutwidth/lutheight;;
45 int STEP = 4;
46
47 int off[8] = {
48 0,
49 STEP*1,
50 STEP*lutdim_r,
51 STEP*(lutdim_r + 1),
52 STEP*(lutdim_r*lutdim_b),
53 STEP*(lutdim_r*lutdim_b+1),
54 STEP*(lutdim_r*lutdim_b+lutdim_r),
55 STEP*(lutdim_r*lutdim_b+lutdim_r + 1)
56 };
57
58 float scale_R = (lutdim_r-1.f)/256.f;
59 float scale_G = (lutdim_g-1.f)/256.f;
60 float scale_B = (lutdim_b-1.f)/256.f;
61
62 int i;
63 for (i = start; i < end; i+= STEP)
64 {
65 int r = rgb[RED];
66 int g = rgb[GREEN];
67 int b = rgb[BLUE];
68
69 float fb = b*scale_B;
70 float fg = g*scale_G;
71 float fr = r*scale_R;
72 int lut_b = (int)fb;
73 int lut_g = (int)fg;
74 int lut_r = (int)fr;
75 int p = lut_r+lut_b*lutdim_r+lut_g*lutdim_r*lutdim_b;
76 p*=STEP;
77 float dr = fr-lut_r;
78 float dg = fg-lut_g;
79 float db = fb-lut_b;
80 rgb[RED] = clamp(interp(lutrgb,p ,off,dr,dg,db));
81 rgb[GREEN] = clamp(interp(lutrgb,p+1,off,dr,dg,db));
82 rgb[BLUE] = clamp(interp(lutrgb,p+2,off,dr,dg,db));
83
84 }
85
86 AndroidBitmap_unlockPixels(env, bitmap);
87 AndroidBitmap_unlockPixels(env, lutbitmap);
88 }
89