-
Notifications
You must be signed in to change notification settings - Fork 26
/
fixed_jpeg_stack.cpp
343 lines (284 loc) · 9.72 KB
/
fixed_jpeg_stack.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
#include <node.h>
#include <node_buffer.h>
#include <jpeglib.h>
#include <cstdlib>
#include <cstring>
#include "common.h"
#include "fixed_jpeg_stack.h"
#include "jpeg_encoder.h"
#include "buffer_compat.h"
using namespace v8;
using namespace node;
void
FixedJpegStack::Initialize(v8::Handle<v8::Object> target)
{
HandleScope scope;
Local<FunctionTemplate> t = FunctionTemplate::New(New);
t->InstanceTemplate()->SetInternalFieldCount(1);
NODE_SET_PROTOTYPE_METHOD(t, "encode", JpegEncodeAsync);
NODE_SET_PROTOTYPE_METHOD(t, "encodeSync", JpegEncodeSync);
NODE_SET_PROTOTYPE_METHOD(t, "push", Push);
NODE_SET_PROTOTYPE_METHOD(t, "setQuality", SetQuality);
target->Set(String::NewSymbol("FixedJpegStack"), t->GetFunction());
}
FixedJpegStack::FixedJpegStack(int wwidth, int hheight, buffer_type bbuf_type) :
width(wwidth), height(hheight), quality(60), buf_type(bbuf_type)
{
data = (unsigned char *)calloc(width*height*3, sizeof(*data));
if (!data) throw "calloc in FixedJpegStack::FixedJpegStack failed!";
}
Handle<Value>
FixedJpegStack::JpegEncodeSync()
{
HandleScope scope;
try {
JpegEncoder jpeg_encoder(data, width, height, quality, BUF_RGB);
jpeg_encoder.encode();
int jpeg_len = jpeg_encoder.get_jpeg_len();
Buffer *retbuf = Buffer::New(jpeg_len);
memcpy(Buffer::Data(retbuf), jpeg_encoder.get_jpeg(), jpeg_len);
return scope.Close(retbuf->handle_);
}
catch (const char *err) {
return VException(err);
}
}
void
FixedJpegStack::Push(unsigned char *data_buf, int x, int y, int w, int h)
{
int start = y*width*3 + x*3;
switch (buf_type) {
case BUF_RGB:
for (int i = 0; i < h; i++) {
unsigned char *datap = &data[start + i*width*3];
for (int j = 0; j < w; j++) {
*datap++ = *data_buf++;
*datap++ = *data_buf++;
*datap++ = *data_buf++;
}
}
break;
case BUF_BGR:
for (int i = 0; i < h; i++) {
unsigned char *datap = &data[start + i*width*3];
for (int j = 0; j < w; j++) {
*datap++ = *(data_buf+2);
*datap++ = *(data_buf+1);
*datap++ = *data_buf;
data_buf+=3;
}
}
break;
case BUF_RGBA:
for (int i = 0; i < h; i++) {
unsigned char *datap = &data[start + i*width*3];
for (int j = 0; j < w; j++) {
*datap++ = *data_buf++;
*datap++ = *data_buf++;
*datap++ = *data_buf++;
data_buf++;
}
}
break;
case BUF_BGRA:
for (int i = 0; i < h; i++) {
unsigned char *datap = &data[start + i*width*3];
for (int j = 0; j < w; j++) {
*datap++ = *(data_buf+2);
*datap++ = *(data_buf+1);
*datap++ = *data_buf;
data_buf += 4;
}
}
break;
default:
throw "Unexpected buf_type in FixedJpegStack::Push";
}
}
void
FixedJpegStack::SetQuality(int q)
{
quality = q;
}
Handle<Value>
FixedJpegStack::New(const Arguments &args)
{
HandleScope scope;
if (args.Length() < 2)
return VException("At least two arguments required - width, height, [and buffer type]");
if (!args[0]->IsInt32())
return VException("First argument must be integer width.");
if (!args[1]->IsInt32())
return VException("Second argument must be integer height.");
int w = args[0]->Int32Value();
int h = args[1]->Int32Value();
if (w < 0)
return VException("Width can't be negative.");
if (h < 0)
return VException("Height can't be negative.");
buffer_type buf_type = BUF_RGB;
if (args.Length() == 3) {
if (!args[2]->IsString())
return VException("Third argument must be a string. Either 'rgb', 'bgr', 'rgba' or 'bgra'.");
String::AsciiValue bt(args[2]->ToString());
if (!(str_eq(*bt, "rgb") || str_eq(*bt, "bgr") ||
str_eq(*bt, "rgba") || str_eq(*bt, "bgra")))
{
return VException("Buffer type must be 'rgb', 'bgr', 'rgba' or 'bgra'.");
}
if (str_eq(*bt, "rgb"))
buf_type = BUF_RGB;
else if (str_eq(*bt, "bgr"))
buf_type = BUF_BGR;
else if (str_eq(*bt, "rgba"))
buf_type = BUF_RGBA;
else if (str_eq(*bt, "bgra"))
buf_type = BUF_BGRA;
else
return VException("Buffer type wasn't 'rgb', 'bgr', 'rgba' or 'bgra'.");
}
try {
FixedJpegStack *jpeg = new FixedJpegStack(w, h, buf_type);
jpeg->Wrap(args.This());
return args.This();
}
catch (const char *err) {
return VException(err);
}
}
Handle<Value>
FixedJpegStack::JpegEncodeSync(const Arguments &args)
{
HandleScope scope;
FixedJpegStack *jpeg = ObjectWrap::Unwrap<FixedJpegStack>(args.This());
return scope.Close(jpeg->JpegEncodeSync());
}
Handle<Value>
FixedJpegStack::Push(const Arguments &args)
{
HandleScope scope;
if (!Buffer::HasInstance(args[0]))
return VException("First argument must be Buffer.");
if (!args[1]->IsInt32())
return VException("Second argument must be integer x.");
if (!args[2]->IsInt32())
return VException("Third argument must be integer y.");
if (!args[3]->IsInt32())
return VException("Fourth argument must be integer w.");
if (!args[4]->IsInt32())
return VException("Fifth argument must be integer h.");
FixedJpegStack *jpeg = ObjectWrap::Unwrap<FixedJpegStack>(args.This());
Local<Object> data_buf = args[0]->ToObject();
int x = args[1]->Int32Value();
int y = args[2]->Int32Value();
int w = args[3]->Int32Value();
int h = args[4]->Int32Value();
if (x < 0)
return VException("Coordinate x smaller than 0.");
if (y < 0)
return VException("Coordinate y smaller than 0.");
if (w < 0)
return VException("Width smaller than 0.");
if (h < 0)
return VException("Height smaller than 0.");
if (x >= jpeg->width)
return VException("Coordinate x exceeds FixedJpegStack's dimensions.");
if (y >= jpeg->height)
return VException("Coordinate y exceeds FixedJpegStack's dimensions.");
if (x+w > jpeg->width)
return VException("Pushed fragment exceeds FixedJpegStack's width.");
if (y+h > jpeg->height)
return VException("Pushed fragment exceeds FixedJpegStack's height.");
jpeg->Push((unsigned char *)Buffer::Data(data_buf), x, y, w, h);
return Undefined();
}
Handle<Value>
FixedJpegStack::SetQuality(const Arguments &args)
{
HandleScope scope;
if (args.Length() != 1)
return VException("One argument required - quality");
if (!args[0]->IsInt32())
return VException("First argument must be integer quality");
int q = args[0]->Int32Value();
if (q < 0)
return VException("Quality must be greater or equal to 0.");
if (q > 100)
return VException("Quality must be less than or equal to 100.");
FixedJpegStack *jpeg = ObjectWrap::Unwrap<FixedJpegStack>(args.This());
jpeg->SetQuality(q);
return Undefined();
}
void
FixedJpegStack::EIO_JpegEncode(eio_req *req)
{
encode_request *enc_req = (encode_request *)req->data;
FixedJpegStack *jpeg = (FixedJpegStack *)enc_req->jpeg_obj;
try {
JpegEncoder encoder(jpeg->data, jpeg->width, jpeg->height, jpeg->quality, BUF_RGB);
encoder.encode();
enc_req->jpeg_len = encoder.get_jpeg_len();
enc_req->jpeg = (char *)malloc(sizeof(*enc_req->jpeg)*enc_req->jpeg_len);
if (!enc_req->jpeg) {
enc_req->error = strdup("malloc in FixedJpegStack::EIO_JpegEncode failed.");
return;
}
else {
memcpy(enc_req->jpeg, encoder.get_jpeg(), enc_req->jpeg_len);
}
}
catch (const char *err) {
enc_req->error = strdup(err);
}
}
int
FixedJpegStack::EIO_JpegEncodeAfter(eio_req *req)
{
HandleScope scope;
ev_unref(EV_DEFAULT_UC);
encode_request *enc_req = (encode_request *)req->data;
Handle<Value> argv[2];
if (enc_req->error) {
argv[0] = Undefined();
argv[1] = ErrorException(enc_req->error);
}
else {
Buffer *buf = Buffer::New(enc_req->jpeg_len);
memcpy(Buffer::Data(buf), enc_req->jpeg, enc_req->jpeg_len);
argv[0] = buf->handle_;
argv[1] = Undefined();
}
TryCatch try_catch; // don't quite see the necessity of this
enc_req->callback->Call(Context::GetCurrent()->Global(), 2, argv);
if (try_catch.HasCaught())
FatalException(try_catch);
enc_req->callback.Dispose();
free(enc_req->jpeg);
free(enc_req->error);
((FixedJpegStack *)enc_req->jpeg_obj)->Unref();
free(enc_req);
return 0;
}
Handle<Value>
FixedJpegStack::JpegEncodeAsync(const Arguments &args)
{
HandleScope scope;
if (args.Length() != 1)
return VException("One argument required - callback function.");
if (!args[0]->IsFunction())
return VException("First argument must be a function.");
Local<Function> callback = Local<Function>::Cast(args[0]);
FixedJpegStack *jpeg = ObjectWrap::Unwrap<FixedJpegStack>(args.This());
encode_request *enc_req = (encode_request *)malloc(sizeof(*enc_req));
if (!enc_req)
return VException("malloc in FixedJpegStack::JpegEncodeAsync failed.");
enc_req->callback = Persistent<Function>::New(callback);
enc_req->jpeg_obj = jpeg;
enc_req->jpeg = NULL;
enc_req->jpeg_len = 0;
enc_req->error = NULL;
eio_custom(EIO_JpegEncode, EIO_PRI_DEFAULT, EIO_JpegEncodeAfter, enc_req);
ev_ref(EV_DEFAULT_UC);
jpeg->Ref();
return Undefined();
}