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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "filters.h"
void JNIFUNCF(ImageFilterHue, nativeApplyFilter, jobject bitmap, jint width, jint height, jfloatArray matrix)
{
char* destination = 0;
AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
unsigned char * rgb = (unsigned char * )destination;
int i;
int len = width * height * 4;
jfloat* mat = (*env)->GetFloatArrayElements(env, matrix,0);
for (i = 0; i < len; i+=4)
{
int r = rgb[RED];
int g = rgb[GREEN];
int b = rgb[BLUE];
float rf = r*mat[0] + g*mat[4] + b*mat[8] + mat[12];
float gf = r*mat[1] + g*mat[5] + b*mat[9] + mat[13];
float bf = r*mat[2] + g*mat[6] + b*mat[10] + mat[14];
rgb[RED] = clamp((int)rf);
rgb[GREEN] = clamp((int)gf);
rgb[BLUE] = clamp((int)bf);
}
(*env)->ReleaseFloatArrayElements(env, matrix, mat, 0);
AndroidBitmap_unlockPixels(env, bitmap);
}
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