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 */
SpecialConvolution(AndroidBitmapInfo * src_info,AndroidBitmapInfo * dst_info,void * src_pixels,void * dst_pixels,float neighbor)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