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
JNIFUNCF(ImageFilterHue,nativeApplyFilter,jobject bitmap,jint width,jint height,jfloatArray matrix)19 void JNIFUNCF(ImageFilterHue, nativeApplyFilter, jobject bitmap, jint width, jint height, jfloatArray matrix)
20 {
21 char* destination = 0;
22 AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
23 unsigned char * rgb = (unsigned char * )destination;
24 int i;
25 int len = width * height * 4;
26 jfloat* mat = (*env)->GetFloatArrayElements(env, matrix,0);
27
28 for (i = 0; i < len; i+=4)
29 {
30 int r = rgb[RED];
31 int g = rgb[GREEN];
32 int b = rgb[BLUE];
33
34 float rf = r*mat[0] + g*mat[4] + b*mat[8] + mat[12];
35 float gf = r*mat[1] + g*mat[5] + b*mat[9] + mat[13];
36 float bf = r*mat[2] + g*mat[6] + b*mat[10] + mat[14];
37
38 rgb[RED] = clamp((int)rf);
39 rgb[GREEN] = clamp((int)gf);
40 rgb[BLUE] = clamp((int)bf);
41 }
42
43 (*env)->ReleaseFloatArrayElements(env, matrix, mat, 0);
44 AndroidBitmap_unlockPixels(env, bitmap);
45 }
46
47