diff options
Diffstat (limited to 'jni/filters/bwfilter.c')
-rw-r--r-- | jni/filters/bwfilter.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/jni/filters/bwfilter.c b/jni/filters/bwfilter.c new file mode 100644 index 000000000..f7fb31ad1 --- /dev/null +++ b/jni/filters/bwfilter.c @@ -0,0 +1,55 @@ +/* + * 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 <math.h> +#include "filters.h" + +void JNIFUNCF(ImageFilterBwFilter, nativeApplyFilter, jobject bitmap, jint width, jint height, jint rw, jint gw, jint bw) +{ + char* destination = 0; + AndroidBitmap_lockPixels(env, bitmap, (void**) &destination); + unsigned char * rgb = (unsigned char * )destination; + float sr = rw; + float sg = gw; + float sb = bw; + + float min = MIN(sg,sb); + min = MIN(sr,min); + float max = MAX(sg,sb); + max = MAX(sr,max); + float avg = (min+max)/2; + sb /= avg; + sg /= avg; + sr /= avg; + int i; + int len = width * height * 4; + + for (i = 0; i < len; i+=4) + { + float r = sr *rgb[RED]; + float g = sg *rgb[GREEN]; + float b = sb *rgb[BLUE]; + min = MIN(g,b); + min = MIN(r,min); + max = MAX(g,b); + max = MAX(r,max); + avg =(min+max)/2; + rgb[RED] = CLAMP(avg); + rgb[GREEN] = rgb[RED]; + rgb[BLUE] = rgb[RED]; + } + AndroidBitmap_unlockPixels(env, bitmap); +} |