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
19void JNIFUNCF(ImageFilter, nativeApplyGradientFilter, jobject bitmap, jint width, jint height,
20        jintArray redGradient, jintArray greenGradient, jintArray blueGradient)
21{
22    char* destination = 0;
23    jint* redGradientArray = 0;
24    jint* greenGradientArray = 0;
25    jint* blueGradientArray = 0;
26    if (redGradient)
27        redGradientArray = (*env)->GetIntArrayElements(env, redGradient, NULL);
28    if (greenGradient)
29        greenGradientArray = (*env)->GetIntArrayElements(env, greenGradient, NULL);
30    if (blueGradient)
31        blueGradientArray = (*env)->GetIntArrayElements(env, blueGradient, NULL);
32
33    AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
34    int i;
35    int len = width * height * 4;
36    for (i = 0; i < len; i+=4)
37    {
38        if (redGradient)
39        {
40            int r = destination[RED];
41            r = redGradientArray[r];
42            destination[RED] = r;
43        }
44        if (greenGradient)
45        {
46            int g = destination[GREEN];
47            g = greenGradientArray[g];
48            destination[GREEN] = g;
49        }
50        if (blueGradient)
51        {
52            int b = destination[BLUE];
53            b = blueGradientArray[b];
54            destination[BLUE] = b;
55        }
56    }
57    if (redGradient)
58        (*env)->ReleaseIntArrayElements(env, redGradient, redGradientArray, 0);
59    if (greenGradient)
60        (*env)->ReleaseIntArrayElements(env, greenGradient, greenGradientArray, 0);
61    if (blueGradient)
62        (*env)->ReleaseIntArrayElements(env, blueGradient, blueGradientArray, 0);
63    AndroidBitmap_unlockPixels(env, bitmap);
64}
65
66