Upstream version 11.40.277.0
[platform/framework/web/crosswalk.git] / src / remoting / base / util.cc
1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "remoting/base/util.h"
6
7 #include <math.h>
8
9 #include "base/logging.h"
10 #include "base/strings/stringprintf.h"
11 #include "base/time/time.h"
12 #include "media/base/video_frame.h"
13 #include "media/base/yuv_convert.h"
14 #include "third_party/libyuv/include/libyuv/convert.h"
15 #include "third_party/webrtc/modules/desktop_capture/desktop_region.h"
16
17 using media::VideoFrame;
18
19 namespace remoting {
20
21 enum { kBytesPerPixelRGB32 = 4 };
22
23 // Do not write LOG messages in this routine since it is called from within
24 // our LOG message handler. Bad things will happen.
25 std::string GetTimestampString() {
26   base::Time t = base::Time::NowFromSystemTime();
27   base::Time::Exploded tex;
28   t.LocalExplode(&tex);
29   return base::StringPrintf("%02d%02d/%02d%02d%02d:",
30                             tex.month, tex.day_of_month,
31                             tex.hour, tex.minute, tex.second);
32 }
33
34 int CalculateRGBOffset(int x, int y, int stride) {
35   return stride * y + kBytesPerPixelRGB32 * x;
36 }
37
38 int CalculateYOffset(int x, int y, int stride) {
39   DCHECK(((x & 1) == 0) && ((y & 1) == 0));
40   return stride * y + x;
41 }
42
43 int CalculateUVOffset(int x, int y, int stride) {
44   DCHECK(((x & 1) == 0) && ((y & 1) == 0));
45   return stride * y / 2 + x / 2;
46 }
47
48 void ConvertAndScaleYUVToRGB32Rect(
49     const uint8* source_yplane,
50     const uint8* source_uplane,
51     const uint8* source_vplane,
52     int source_ystride,
53     int source_uvstride,
54     const webrtc::DesktopSize& source_size,
55     const webrtc::DesktopRect& source_buffer_rect,
56     uint8* dest_buffer,
57     int dest_stride,
58     const webrtc::DesktopSize& dest_size,
59     const webrtc::DesktopRect& dest_buffer_rect,
60     const webrtc::DesktopRect& dest_rect) {
61   // N.B. It is caller's responsibility to check if strides are large enough. We
62   // cannot do it here anyway.
63   DCHECK(DoesRectContain(webrtc::DesktopRect::MakeSize(source_size),
64                          source_buffer_rect));
65   DCHECK(DoesRectContain(webrtc::DesktopRect::MakeSize(dest_size),
66                          dest_buffer_rect));
67   DCHECK(DoesRectContain(dest_buffer_rect, dest_rect));
68   DCHECK(DoesRectContain(ScaleRect(source_buffer_rect, source_size, dest_size),
69                          dest_rect));
70
71   // If the source and/or destination buffers don't start at (0, 0)
72   // offset the pointers to pretend we have complete buffers.
73   int y_offset = - CalculateYOffset(source_buffer_rect.left(),
74                                     source_buffer_rect.top(),
75                                     source_ystride);
76   int uv_offset = - CalculateUVOffset(source_buffer_rect.left(),
77                                       source_buffer_rect.top(),
78                                       source_uvstride);
79   int rgb_offset = - CalculateRGBOffset(dest_buffer_rect.left(),
80                                         dest_buffer_rect.top(),
81                                         dest_stride);
82
83   // See if scaling is needed.
84   if (source_size.equals(dest_size)) {
85     // Calculate the inner rectangle that can be copied by the optimized
86     // libyuv::I420ToARGB().
87     webrtc::DesktopRect inner_rect =
88         webrtc::DesktopRect::MakeLTRB(RoundToTwosMultiple(dest_rect.left() + 1),
89                                       RoundToTwosMultiple(dest_rect.top() + 1),
90                                       dest_rect.right(), dest_rect.bottom());
91
92     // Offset pointers to point to the top left corner of the inner rectangle.
93     y_offset += CalculateYOffset(inner_rect.left(), inner_rect.top(),
94                                  source_ystride);
95     uv_offset += CalculateUVOffset(inner_rect.left(), inner_rect.top(),
96                                    source_uvstride);
97     rgb_offset += CalculateRGBOffset(inner_rect.left(), inner_rect.top(),
98                                      dest_stride);
99
100     libyuv::I420ToARGB(source_yplane + y_offset, source_ystride,
101                        source_uplane + uv_offset, source_uvstride,
102                        source_vplane + uv_offset, source_uvstride,
103                        dest_buffer + rgb_offset, dest_stride,
104                        inner_rect.width(), inner_rect.height());
105
106     // Now see if some pixels weren't copied due to alignment.
107     if (!dest_rect.equals(inner_rect)) {
108       webrtc::DesktopRect outer_rect =
109           webrtc::DesktopRect::MakeLTRB(RoundToTwosMultiple(dest_rect.left()),
110                                         RoundToTwosMultiple(dest_rect.top()),
111                                         dest_rect.right(), dest_rect.bottom());
112
113       webrtc::DesktopVector offset(outer_rect.left() - inner_rect.left(),
114                                    outer_rect.top() - inner_rect.top());
115
116       // Offset the pointers to point to the top left corner of the outer
117       // rectangle.
118       y_offset += CalculateYOffset(offset.x(), offset.y(), source_ystride);
119       uv_offset += CalculateUVOffset(offset.x(), offset.y(), source_uvstride);
120       rgb_offset += CalculateRGBOffset(offset.x(), offset.y(), dest_stride);
121
122       // Draw unaligned edges.
123       webrtc::DesktopRegion edges(dest_rect);
124       edges.Subtract(inner_rect);
125       for (webrtc::DesktopRegion::Iterator i(edges); !i.IsAtEnd();
126            i.Advance()) {
127         webrtc::DesktopRect rect = i.rect();
128         rect.Translate(-outer_rect.left(), -outer_rect.top());
129         media::ScaleYUVToRGB32WithRect(source_yplane + y_offset,
130                                        source_uplane + uv_offset,
131                                        source_vplane + uv_offset,
132                                        dest_buffer + rgb_offset,
133                                        source_size.width(),
134                                        source_size.height(),
135                                        dest_size.width(),
136                                        dest_size.height(),
137                                        rect.left(),
138                                        rect.top(),
139                                        rect.right(),
140                                        rect.bottom(),
141                                        source_ystride,
142                                        source_uvstride,
143                                        dest_stride);
144       }
145     }
146   } else {
147     media::ScaleYUVToRGB32WithRect(source_yplane + y_offset,
148                                    source_uplane + uv_offset,
149                                    source_vplane + uv_offset,
150                                    dest_buffer + rgb_offset,
151                                    source_size.width(),
152                                    source_size.height(),
153                                    dest_size.width(),
154                                    dest_size.height(),
155                                    dest_rect.left(),
156                                    dest_rect.top(),
157                                    dest_rect.right(),
158                                    dest_rect.bottom(),
159                                    source_ystride,
160                                    source_uvstride,
161                                    dest_stride);
162   }
163 }
164
165 int RoundToTwosMultiple(int x) {
166   return x & (~1);
167 }
168
169 webrtc::DesktopRect AlignRect(const webrtc::DesktopRect& rect) {
170   int x = RoundToTwosMultiple(rect.left());
171   int y = RoundToTwosMultiple(rect.top());
172   int right = RoundToTwosMultiple(rect.right() + 1);
173   int bottom = RoundToTwosMultiple(rect.bottom() + 1);
174   return webrtc::DesktopRect::MakeLTRB(x, y, right, bottom);
175 }
176
177 webrtc::DesktopRect ScaleRect(const webrtc::DesktopRect& rect,
178                               const webrtc::DesktopSize& in_size,
179                               const webrtc::DesktopSize& out_size) {
180   int left = (rect.left() * out_size.width()) / in_size.width();
181   int top = (rect.top() * out_size.height()) / in_size.height();
182   int right = (rect.right() * out_size.width() + in_size.width() - 1) /
183       in_size.width();
184   int bottom = (rect.bottom() * out_size.height() + in_size.height() - 1) /
185       in_size.height();
186   return webrtc::DesktopRect::MakeLTRB(left, top, right, bottom);
187 }
188
189 void CopyRGB32Rect(const uint8* source_buffer,
190                    int source_stride,
191                    const webrtc::DesktopRect& source_buffer_rect,
192                    uint8* dest_buffer,
193                    int dest_stride,
194                    const webrtc::DesktopRect& dest_buffer_rect,
195                    const webrtc::DesktopRect& dest_rect) {
196   DCHECK(DoesRectContain(dest_buffer_rect, dest_rect));
197   DCHECK(DoesRectContain(source_buffer_rect, dest_rect));
198
199   // Get the address of the starting point.
200   source_buffer += CalculateRGBOffset(
201       dest_rect.left() - source_buffer_rect.left(),
202       dest_rect.top() - source_buffer_rect.top(),
203       source_stride);
204   dest_buffer += CalculateRGBOffset(
205       dest_rect.left() - dest_buffer_rect.left(),
206       dest_rect.top() - dest_buffer_rect.top(),
207       source_stride);
208
209   // Copy pixels in the rectangle line by line.
210   const int bytes_per_line = kBytesPerPixelRGB32 * dest_rect.width();
211   for (int i = 0 ; i < dest_rect.height(); ++i) {
212     memcpy(dest_buffer, source_buffer, bytes_per_line);
213     source_buffer += source_stride;
214     dest_buffer += dest_stride;
215   }
216 }
217
218 std::string ReplaceLfByCrLf(const std::string& in) {
219   std::string out;
220   out.resize(2 * in.size());
221   char* out_p_begin = &out[0];
222   char* out_p = out_p_begin;
223   const char* in_p_begin = &in[0];
224   const char* in_p_end = &in[in.size()];
225   for (const char* in_p = in_p_begin; in_p < in_p_end; ++in_p) {
226     char c = *in_p;
227     if (c == '\n') {
228       *out_p++ = '\r';
229     }
230     *out_p++ = c;
231   }
232   out.resize(out_p - out_p_begin);
233   return out;
234 }
235
236 std::string ReplaceCrLfByLf(const std::string& in) {
237   std::string out;
238   out.resize(in.size());
239   char* out_p_begin = &out[0];
240   char* out_p = out_p_begin;
241   const char* in_p_begin = &in[0];
242   const char* in_p_end = &in[in.size()];
243   for (const char* in_p = in_p_begin; in_p < in_p_end; ++in_p) {
244     char c = *in_p;
245     if ((c == '\r') && (in_p + 1 < in_p_end) && (*(in_p + 1) == '\n')) {
246       *out_p++ = '\n';
247       ++in_p;
248     } else {
249       *out_p++ = c;
250     }
251   }
252   out.resize(out_p - out_p_begin);
253   return out;
254 }
255
256 bool StringIsUtf8(const char* data, size_t length) {
257   const char* ptr = data;
258   const char* ptr_end = data + length;
259   while (ptr != ptr_end) {
260     if ((*ptr & 0x80) == 0) {
261       // Single-byte symbol.
262       ++ptr;
263     } else if ((*ptr & 0xc0) == 0x80 || (*ptr & 0xfe) == 0xfe) {
264       // Invalid first byte.
265       return false;
266     } else {
267       // First byte of a multi-byte symbol. The bits from 2 to 6 are the count
268       // of continuation bytes (up to 5 of them).
269       for (char first = *ptr << 1; first & 0x80; first <<= 1) {
270         ++ptr;
271
272         // Missing continuation byte.
273         if (ptr == ptr_end)
274           return false;
275
276         // Invalid continuation byte.
277         if ((*ptr & 0xc0) != 0x80)
278           return false;
279       }
280
281       ++ptr;
282     }
283   }
284
285   return true;
286 }
287
288 bool DoesRectContain(const webrtc::DesktopRect& a,
289                      const webrtc::DesktopRect& b) {
290   webrtc::DesktopRect intersection(a);
291   intersection.IntersectWith(b);
292   return intersection.equals(b);
293 }
294
295 }  // namespace remoting