Backend.cc
2.08 KB
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
#include "Backend.h"
#include <string>
Backend::Backend(std::string name, int width, int height)
: name(name)
, width(width)
, height(height)
{}
Backend::~Backend()
{
this->destroySurface();
}
void Backend::init(const Nan::FunctionCallbackInfo<v8::Value> &info) {
int width = 0;
int height = 0;
if (info[0]->IsNumber()) width = Nan::To<uint32_t>(info[0]).FromMaybe(0);
if (info[1]->IsNumber()) height = Nan::To<uint32_t>(info[1]).FromMaybe(0);
Backend *backend = construct(width, height);
backend->Wrap(info.This());
info.GetReturnValue().Set(info.This());
}
void Backend::setCanvas(Canvas* _canvas)
{
this->canvas = _canvas;
}
cairo_surface_t* Backend::recreateSurface()
{
this->destroySurface();
return this->createSurface();
}
DLL_PUBLIC cairo_surface_t* Backend::getSurface() {
if (!surface) createSurface();
return surface;
}
void Backend::destroySurface()
{
if(this->surface)
{
cairo_surface_destroy(this->surface);
this->surface = NULL;
}
}
std::string Backend::getName()
{
return name;
}
int Backend::getWidth()
{
return this->width;
}
void Backend::setWidth(int width_)
{
this->width = width_;
this->recreateSurface();
}
int Backend::getHeight()
{
return this->height;
}
void Backend::setHeight(int height_)
{
this->height = height_;
this->recreateSurface();
}
bool Backend::isSurfaceValid(){
bool hadSurface = surface != NULL;
bool isValid = true;
cairo_status_t status = cairo_surface_status(getSurface());
if (status != CAIRO_STATUS_SUCCESS) {
error = cairo_status_to_string(status);
isValid = false;
}
if (!hadSurface)
destroySurface();
return isValid;
}
BackendOperationNotAvailable::BackendOperationNotAvailable(Backend* backend,
std::string operation_name)
: backend(backend)
, operation_name(operation_name)
{};
BackendOperationNotAvailable::~BackendOperationNotAvailable() throw() {};
const char* BackendOperationNotAvailable::what() const throw()
{
std::string msg = "operation " + this->operation_name +
" not supported by backend " + backend->getName();
return msg.c_str();
};