1 /* 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include "webrtc/modules/video_processing/main/source/brighten.h" 12 13 #include <stdlib.h> 14 15 namespace webrtc { 16 namespace VideoProcessing { 17 18 int32_t Brighten(I420VideoFrame* frame, int delta) { 19 assert(frame); 20 if (frame->IsZeroSize()) { 21 return VPM_PARAMETER_ERROR; 22 } 23 if (frame->width() <= 0 || frame->height() <= 0) { 24 return VPM_PARAMETER_ERROR; 25 } 26 27 int num_pixels = frame->width() * frame->height(); 28 29 int look_up[256]; 30 for (int i = 0; i < 256; i++) { 31 int val = i + delta; 32 look_up[i] = ((((val < 0) ? 0 : val) > 255) ? 255 : val); 33 } 34 35 uint8_t* temp_ptr = frame->buffer(kYPlane); 36 37 for (int i = 0; i < num_pixels; i++) { 38 *temp_ptr = static_cast<uint8_t>(look_up[*temp_ptr]); 39 temp_ptr++; 40 } 41 return VPM_OK; 42 } 43 44 } // namespace VideoProcessing 45 } // namespace webrtc 46
