1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <android/bitmap.h> 18 19 #include <cstdlib> 20 21 #include "utils.h" 22 23 using android::apps::photoeditor::utils::clamp; 24 using android::apps::photoeditor::utils::LockBitmaps; 25 using android::apps::photoeditor::utils::pixel32_t; 26 using android::apps::photoeditor::utils::UnlockBitmaps; 27 28 namespace android { 29 namespace apps { 30 namespace photoeditor { 31 namespace convolution { 32 33 /* 34 * Used for convolution of following kernel: 35 * n n n 36 * n c n 37 * n n n 38 * n: neighbor, c: center 39 */ 40 void SpecialConvolution(AndroidBitmapInfo *src_info, AndroidBitmapInfo *dst_info, 41 void *src_pixels, void *dst_pixels, float neighbor) { 42 43 if (neighbor == 0) { 44 memcpy(dst_pixels, src_pixels, src_info->stride * src_info->height); 45 return; 46 } 47 48 /* Copy the first row to dst_pixels */ 49 memcpy(dst_pixels, src_pixels, src_info->stride); 50 src_pixels = reinterpret_cast<char*>(src_pixels) + src_info->stride; 51 dst_pixels = reinterpret_cast<char*>(dst_pixels) + dst_info->stride; 52 53 const int32_t kShiftBits = 10; 54 int32_t fixed_neighbor = static_cast<int32_t>((1 << kShiftBits) * neighbor); 55 int32_t fixed_center = static_cast<int32_t>((1 << kShiftBits) * (1 - neighbor * 8)); 56 57 for (uint32_t scan_line = 1; scan_line < dst_info->height - 1; scan_line++) { 58 pixel32_t* src = reinterpret_cast<pixel32_t*>(src_pixels); 59 uint32_t* src_prev = reinterpret_cast<uint32_t*> 60 (reinterpret_cast<char*>(src_pixels) - src_info->stride); 61 uint32_t* src_next = reinterpret_cast<uint32_t*> 62 (reinterpret_cast<char*>(src_pixels) + src_info->stride); 63 64 uint32_t* dst = reinterpret_cast<uint32_t*>(dst_pixels); 65 *dst++ = src->rgba32; 66 src++; 67 src_prev++; 68 src_next++; 69 70 uint32_t* dst_line_end = dst + dst_info->width - 1; 71 while (dst < dst_line_end) { 72 int32_t src_red = src->rgba8[0]; 73 int32_t src_green = src->rgba8[1]; 74 int32_t src_blue = src->rgba8[2]; 75 int32_t src_alpha = src->rgba8[3]; 76 77 uint8_t* n1 = reinterpret_cast<uint8_t*>(src_prev - 1); 78 uint8_t* n2 = reinterpret_cast<uint8_t*>(src - 1); 79 uint8_t* n3 = reinterpret_cast<uint8_t*>(src_next - 1); 80 uint8_t* n4 = reinterpret_cast<uint8_t*>(src_prev); 81 uint8_t* n5 = reinterpret_cast<uint8_t*>(src_next); 82 uint8_t* n6 = reinterpret_cast<uint8_t*>(src_prev + 1); 83 uint8_t* n7 = reinterpret_cast<uint8_t*>(src + 1); 84 uint8_t* n8 = reinterpret_cast<uint8_t*>(src_next + 1); 85 86 int32_t red = n1[0] + n2[0] + n3[0] + n4[0] + n5[0] + n6[0] + n7[0] + n8[0]; 87 int32_t green = n1[1] + n2[1] + n3[1] + n4[1] + n5[1] + n6[1] + n7[1] + n8[1]; 88 int32_t blue = n1[2] + n2[2] + n3[2] + n4[2] + n5[2] + n6[2] + n7[2] + n8[2]; 89 90 red = (fixed_neighbor * red + fixed_center * src_red) >> kShiftBits; 91 green = (fixed_neighbor * green + fixed_center * src_green) >> kShiftBits; 92 blue = (fixed_neighbor * blue + fixed_center * src_blue) >> kShiftBits; 93 94 red = clamp(red, 0, 255); 95 green = clamp(green, 0, 255); 96 blue = clamp(blue, 0, 255); 97 98 *dst = (src_alpha << 24) | (blue << 16) | (green << 8) | red; 99 dst++; 100 src++; 101 src_prev++; 102 src_next++; 103 } 104 *dst = src->rgba32; 105 src_pixels = reinterpret_cast<char*>(src_pixels) + src_info->stride; 106 dst_pixels = reinterpret_cast<char*>(dst_pixels) + dst_info->stride; 107 } 108 109 /* Copy the last row to dst_pixels */ 110 memcpy(dst_pixels, src_pixels, src_info->stride); 111 } 112 113 } // namespace convolution 114 } // namespace photoeditor 115 } // namespace apps 116 } // namespace android 117
