| /* |
| * Copyright (C) 2013 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. |
| */ |
| |
| #ifndef ANDROID_HWUI_BLUR_H |
| #define ANDROID_HWUI_BLUR_H |
| |
| #include <stdint.h> |
| #include <cutils/compiler.h> |
| |
| namespace android { |
| namespace uirenderer { |
| |
| class Blur { |
| public: |
| // If radius > 0, return the corresponding sigma, else return 0 |
| ANDROID_API static float convertRadiusToSigma(float radius); |
| // If sigma > 0.5, return the corresponding radius, else return 0 |
| ANDROID_API static float convertSigmaToRadius(float sigma); |
| // If the original radius was on an integer boundary then after the sigma to |
| // radius conversion a small rounding error may be introduced. This function |
| // accounts for that error and snaps to the appropriate integer boundary. |
| static uint32_t convertRadiusToInt(float radius); |
| |
| static void generateGaussianWeights(float* weights, int32_t radius); |
| static void horizontal(float* weights, int32_t radius, const uint8_t* source, |
| uint8_t* dest, int32_t width, int32_t height); |
| static void vertical(float* weights, int32_t radius, const uint8_t* source, |
| uint8_t* dest, int32_t width, int32_t height); |
| }; |
| |
| }; // namespace uirenderer |
| }; // namespace android |
| |
| #endif // ANDROID_HWUI_BLUR_H |