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
|
/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
package skia
/*
#cgo LDFLAGS: -L${SRCDIR}/../../out/Shared
#cgo LDFLAGS: -Wl,-rpath=${SRCDIR}/../../out/Shared
#cgo LDFLAGS: -lskia
#cgo CFLAGS: -I../../include/c
#include "sk_canvas.h"
#include "sk_data.h"
#include "sk_image.h"
#include "sk_paint.h"
#include "sk_path.h"
#include "sk_surface.h"
*/
import "C"
import (
"fmt"
"io"
"runtime"
"unsafe"
)
// TODO(stephana): Add proper documentation to the types defined here.
//////////////////////////////////////////////////////////////////////////
// Surface
//////////////////////////////////////////////////////////////////////////
type Surface struct {
ptr *C.sk_surface_t
}
// func NewRasterSurface(width, height int32, alphaType AlphaType) (*Surface, error) {
func NewRasterSurface(imgInfo *ImageInfo) (*Surface, error) {
ptr := C.sk_surface_new_raster(imgInfo.cPointer(), (*C.sk_surfaceprops_t)(nil))
if ptr == nil {
return nil, fmt.Errorf("Unable to create raster surface.")
}
ret := &Surface{ptr: ptr}
runtime.SetFinalizer(ret, func(s *Surface) {
C.sk_surface_unref(s.ptr)
})
return ret, nil
}
func (s *Surface) Canvas() *Canvas {
return &Canvas{
ptr: C.sk_surface_get_canvas(s.ptr),
keepParentAlive: s,
}
}
func (s *Surface) Image() *Image {
ret := &Image{
ptr: C.sk_surface_new_image_snapshot(s.ptr),
keepParentAlive: s,
}
runtime.SetFinalizer(ret, func(i *Image) {
C.sk_image_unref(i.ptr)
})
return ret
}
//////////////////////////////////////////////////////////////////////////
// Image
//////////////////////////////////////////////////////////////////////////
type Image struct {
ptr *C.sk_image_t
keepParentAlive *Surface
}
func (i *Image) WritePNG(w io.Writer) error {
data := C.sk_image_encode(i.ptr)
defer C.sk_data_unref(data)
dataPtr := C.sk_data_get_data(data)
dataSize := C.sk_data_get_size(data)
byteSlice := C.GoBytes(dataPtr, C.int(dataSize))
_, err := w.Write(byteSlice)
if err != nil {
return err
}
return nil
}
//////////////////////////////////////////////////////////////////////////
// Canvas
//////////////////////////////////////////////////////////////////////////
type Canvas struct {
ptr *C.sk_canvas_t
keepParentAlive *Surface
}
func (c *Canvas) DrawPaint(paint *Paint) {
C.sk_canvas_draw_paint(c.ptr, paint.ptr)
}
func (c *Canvas) DrawOval(rect *Rect, paint *Paint) {
// C.sk_canvas_draw_oval(c.ptr, (*C.sk_rect_t)(unsafe.Pointer(rect)), (*C.sk_paint_t)(paint.ptr))
C.sk_canvas_draw_oval(c.ptr, rect.cPointer(), paint.ptr)
}
func (c *Canvas) DrawRect(rect *Rect, paint *Paint) {
// C.sk_canvas_draw_rect(c.ptr, (*C.sk_rect_t)(unsafe.Pointer(rect)), (*C.sk_paint_t)(paint.ptr))
C.sk_canvas_draw_rect(c.ptr, rect.cPointer(), paint.ptr)
}
func (c *Canvas) DrawPath(path *Path, paint *Paint) {
// C.sk_canvas_draw_path(c.ptr, (*C.sk_path_t)(path.ptr), (*C.sk_paint_t)(paint.ptr))
C.sk_canvas_draw_path(c.ptr, path.ptr, paint.ptr)
}
//////////////////////////////////////////////////////////////////////////
// Paint
//////////////////////////////////////////////////////////////////////////
type Paint struct {
ptr *C.sk_paint_t
}
func NewPaint() *Paint {
ret := &Paint{ptr: C.sk_paint_new()}
runtime.SetFinalizer(ret, func(p *Paint) {
C.sk_paint_delete(p.ptr)
})
return ret
}
func (p *Paint) SetColor(color Color) {
C.sk_paint_set_color(p.ptr, C.sk_color_t(color))
}
func (p *Paint) SetAntiAlias(antiAlias bool) {
C.sk_paint_set_antialias(p.ptr, C._Bool(antiAlias))
}
func (p *Paint) SetStroke(val bool) {
C.sk_paint_set_stroke(p.ptr, C._Bool(val))
}
func (p *Paint) SetStrokeWidth(width float32) {
C.sk_paint_set_stroke_width(p.ptr, C.float(width))
}
//////////////////////////////////////////////////////////////////////////
// Path
//////////////////////////////////////////////////////////////////////////
type Path struct {
ptr *C.sk_path_t
}
func NewPath() *Path {
ret := &Path{ptr: C.sk_path_new()}
runtime.SetFinalizer(ret, func(p *Path) {
C.sk_path_delete(p.ptr)
})
return ret
}
func (p *Path) MoveTo(x, y float32) {
C.sk_path_move_to(p.ptr, C.float(x), C.float(y))
}
func (p *Path) LineTo(x, y float32) {
C.sk_path_line_to(p.ptr, C.float(x), C.float(y))
}
func (p *Path) QuadTo(x0, y0, x1, y1 float32) {
C.sk_path_quad_to(p.ptr, C.float(x0), C.float(y0), C.float(x1), C.float(y1))
}
func (p *Path) ConicTo(x0, y0, x1, y1, w float32) {
C.sk_path_conic_to(p.ptr, C.float(x0), C.float(y0), C.float(x1), C.float(y1), C.float(w))
}
func (p *Path) CubicTo(x0, y0, x1, y1, x2, y2 float32) {
C.sk_path_cubic_to(p.ptr, C.float(x0), C.float(y0), C.float(x1), C.float(y1), C.float(x2), C.float(y2))
}
func (p *Path) Close() {
C.sk_path_close(p.ptr)
}
// NewRect is a convenience function to define a Rect in a single line.
func NewRect(left, top, right, bottom float32) *Rect {
return &Rect{
Left: left,
Top: top,
Right: right,
Bottom: bottom,
}
}
// cPointer casts the pointer to Rect to the corresponding C pointer.
func (r *Rect) cPointer() *C.sk_rect_t {
return (*C.sk_rect_t)(unsafe.Pointer(r))
}
// cPointer casts the pointer to ImageInfo to the corresponding C pointer.
func (i *ImageInfo) cPointer() *C.sk_imageinfo_t {
return (*C.sk_imageinfo_t)(unsafe.Pointer(i))
}
// Utility functions.
func GetDefaultColortype() ColorType {
return ColorType(C.sk_colortype_get_default_8888())
}
|
