diff options
Diffstat (limited to 'jni/filters/vignette.c')
-rw-r--r-- | jni/filters/vignette.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/jni/filters/vignette.c b/jni/filters/vignette.c new file mode 100644 index 000000000..7cff517b6 --- /dev/null +++ b/jni/filters/vignette.c @@ -0,0 +1,69 @@ +/* + * 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" + +static int* gVignetteMap = 0; +static int gVignetteWidth = 0; +static int gVignetteHeight = 0; + +void __inline__ createVignetteMap(int w, int h) +{ + if (gVignetteMap && (gVignetteWidth != w || gVignetteHeight != h)) + { + free(gVignetteMap); + gVignetteMap = 0; + } + if (gVignetteMap == 0) + { + gVignetteWidth = w; + gVignetteHeight = h; + + int cx = w / 2; + int cy = h / 2; + int i, j; + + gVignetteMap = malloc(w * h * sizeof(int)); + float maxDistance = cx * cx * 2.0f; + for (i = 0; i < w; i++) + { + for (j = 0; j < h; j++) + { + float distance = (cx - i) * (cx - i) + (cy - j) * (cy - j); + gVignetteMap[j * w + i] = (int) (distance / maxDistance * 255); + } + } + } +} + +void JNIFUNCF(ImageFilterVignette, nativeApplyFilter, jobject bitmap, jint width, jint height, jfloat strength) +{ + char* destination = 0; + AndroidBitmap_lockPixels(env, bitmap, (void**) &destination); + createVignetteMap(width, height); + int i; + int len = width * height * 4; + int vignette = 0; + + for (i = 0; i < len; i += 4) + { + vignette = (int) (strength * gVignetteMap[i / 4]); + destination[RED] = CLAMP(destination[RED] - vignette); + destination[GREEN] = CLAMP(destination[GREEN] - vignette); + destination[BLUE] = CLAMP(destination[BLUE] - vignette); + } + AndroidBitmap_unlockPixels(env, bitmap); +} |