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OpenVG Specification

Version 1.1

Version 1.0 – August 1, 2005

Version 1.0.1 – January 26, 2007

Version 1.1 – December 3, 2008

Editors: Daniel Rice, Google, Inc.

Robert J. Simpson, AMD

“ ”

For Ilise – DSR

This specification is protected by copyright laws and contains material

proprietary to the Khronos Group, Inc. It or any components may not be

reproduced, republished, distributed, transmitted, displayed, broadcast or

otherwise exploited in any manner without the express prior written permission

of Khronos Group. You may use this specification for implementing the

functionality therein, without altering or removing any trademark, copyright or

other notice from the specification, but the receipt or possession of this

specification does not convey any rights to reproduce, disclose, or distribute its

contents, or to manufacture, use, or sell anything that it may describe, in whole

or in part.

Khronos Group grants express permission to any current Promoter, Contributor

or Adopter member of Khronos to copy and redistribute UNMODIFIED versions

of this specification in any fashion, provided that NO CHARGE is made for the

specification and the latest available update of the specification for any version of

the API is used whenever possible. Such distributed specification may be re-

formatted AS LONG AS the contents of the specification are not changed in any

way. The specification may be incorporated into a product that is sold as long as

such product includes significant independent work developed by the seller. A

link to the current version of this specification on the Khronos Group web-site

should be included whenever possible with specification distributions.

Khronos Group makes no, and expressly disclaims any, representations or

warranties, express or implied, regarding this specification, including, without

limitation, any implied warranties of merchantability or fitness for a particular

purpose or non-infringement of any intellectual property.

Khronos Group makes no, and expressly disclaims any, warranties, express or

implied regarding the correctness, accuracy, completeness, timeliness, and

reliability of the specification. Under no circumstances will the Khronos Group,

or any of its Promoters, Contributors or Members or their respective partners,

officers, directors, employees, agents or representatives be liable for any

damages, whether direct, indirect, special or consequential damages for lost

revenues, lost profits, or otherwise, arising from or in connection with these

materials.

Khronos and OpenVG are trademarks of The Khronos Group Inc. OpenGL is a

registered trademark, and OpenGL ES is a trademark, of Silicon Graphics, Inc.

Table of Contents

1Introduction..................................................................................................................................10

1.1Feature Set..........................................................................................................................10

1.2Target Applications..............................................................................................................10

SVG and Adobe Flash Viewers .................................................................................................10

Portable Mapping Applications................................................................................................10

E-book Readers............................................................................................................................11

Games...........................................................................................................................................11

Scalable User Interfaces.............................................................................................................11

Low-Level Graphics Device Interface......................................................................................11

1.3Target Devices.....................................................................................................................11

1.4Design Philosophy...............................................................................................................11

1.5Naming and Typographical Conventions.............................................................................12

1.6Library Naming....................................................................................................................12

2The OpenVG Pipeline..................................................................................................................13

2.1Stage 1: Path, Transformation, Stroke, and Paint...............................................................14

2.2Stage 2: Stroked Path Generation.......................................................................................14

2.3Stage 3: Transformation......................................................................................................14

2.4Stage 4: Rasterization.........................................................................................................14

2.5Stage 5: Clipping and Masking............................................................................................15

2.6Stage 6: Paint Generation...................................................................................................15

2.7Stage 7: Image Interpolation...............................................................................................15

2.8Stage 8: Color Transformation, Blending, and Antialiasing..................................................16

2.9Multisampling......................................................................................................................16

3Constants, Functions and Data Types.........................................................................................16

3.1Versioning............................................................................................................................17

OPENVG_VERSION_1_1..........................................................................................................17

3.2Primitive Data Types............................................................................................................17

VGbyte..........................................................................................................................................17

VGubyte.......................................................................................................................................17

VGshort........................................................................................................................................17

VGint.............................................................................................................................................18

VGuint..........................................................................................................................................18

VGbitfield.....................................................................................................................................18

VGboolean...................................................................................................................................18

VGfloat.........................................................................................................................................18

3.3Floating-Point and Integer Representations........................................................................18

VG_MAXSHORT........................................................................................................................19

VG_MAXINT...............................................................................................................................19

VG_MAX_FLOAT.......................................................................................................................19

3.4Colors..................................................................................................................................19

3.4.1Linear and Non-Linear Color Representations............................................................20

3.4.2Color Space Definitions...............................................................................................21

3.4.3Premultiplied Alpha......................................................................................................23

3.4.4Color Format Conversion............................................................................................23

3.5Enumerated Data Types......................................................................................................24

3.7Handle-based Data Types...................................................................................................25

VGHandle....................................................................................................................................25

VG_INVALID_HANDLE..........................................................................................................26

4The Drawing Context...................................................................................................................27

4.1Errors..................................................................................................................................29

VGErrorCode...............................................................................................................................29

vgGetError...................................................................................................................................30

4.2Manipulating the Context Using EGL ..................................................................................30

4.2.1EGLConfig Attributes...................................................................................................30

EGL_OPENVG_BIT....................................................................................................................30

EGL_ALPHA_MASK_SIZE.......................................................................................................31

4.2.2EGL Functions.............................................................................................................31

eglBindAPI...................................................................................................................................31

eglCreateContext.........................................................................................................................31

eglCreateWindowSurface..........................................................................................................31

eglCreatePbufferFromClientBuffer..........................................................................................32

eglMakeCurrent..........................................................................................................................32

eglGetCurrentContext................................................................................................................32

eglDestroyContext......................................................................................................................32

eglSwapBuffers............................................................................................................................32

4.3Forcing Drawing to Complete..............................................................................................33

vgFlush.........................................................................................................................................33

vgFinish........................................................................................................................................33

5Setting API Parameters...............................................................................................................34

5.1Context Parameter Types....................................................................................................34

VGParamType.............................................................................................................................34

5.2Setting and Querying Context Parameter Values................................................................36

vgSet..............................................................................................................................................36

vgGet and vgGetVectorSize .......................................................................................................37

5.2.1Default Context Parameter Values..............................................................................38

5.3Setting and Querying Object Parameter Values..................................................................40

vgSetParameter...........................................................................................................................40

vgGetParameter and vgGetParameterVectorSize ..................................................................41

6Rendering Quality and Antialiasing..............................................................................................44

6.1Rendering Quality................................................................................................................45

VGRenderingQuality.................................................................................................................45

6.2Additional Quality Settings...................................................................................................46

VGPixelLayout............................................................................................................................46

6.3Coordinate Systems and Transformations...........................................................................47

6.4Coordinate Systems............................................................................................................47

6.5Transformations...................................................................................................................48

6.5.1Homogeneous Coordinates.........................................................................................48

6.5.2Affine Transformations.................................................................................................49

6.5.3Projective (Perspective) Transformations....................................................................49

6.6Matrix Manipulation.............................................................................................................50

VGMatrixMode...........................................................................................................................51

vgLoadIdentity............................................................................................................................51

vgLoadMatrix..............................................................................................................................51

vgGetMatrix.................................................................................................................................52

.......................................................................................................................................................52

vgMultMatrix..............................................................................................................................53

vgTranslate...................................................................................................................................53

vgScale..........................................................................................................................................54

vgShear.........................................................................................................................................54

vgRotate.......................................................................................................................................54

7Scissoring, Masking, and Clearing..............................................................................................55

7.1Scissoring............................................................................................................................55

VG_MAX_SCISSOR_RECTS.....................................................................................................55

Specifying Scissoring Rectangles..............................................................................................55

7.2Masking ..............................................................................................................................56

VGMaskOperation......................................................................................................................57

vgMask.........................................................................................................................................58

vgRenderToMask........................................................................................................................60

VGMaskLayer..............................................................................................................................61

vgCreateMaskLayer...................................................................................................................61

vgDestroyMaskLayer.................................................................................................................62

vgFillMaskLayer.........................................................................................................................62

vgCopyMask...............................................................................................................................63

7.3Fast Clearing.......................................................................................................................64

vgClear.........................................................................................................................................64

8Paths...........................................................................................................................................64

8.1Moves..................................................................................................................................65

8.2Straight Line Segments.......................................................................................................65

8.3Bézier Curves......................................................................................................................65

8.3.1Quadratic Bézier Curves.............................................................................................65

8.3.2Cubic Bézier Curves....................................................................................................66

8.3.3G1 Smooth Segments.................................................................................................66

8.3.4C1 Smooth Segments.................................................................................................67

8.3.5C2 Smooth Segments.................................................................................................68

8.3.6Converting Segments From Quadratic to Cubic Form.................................................68

8.4Elliptical Arcs.......................................................................................................................68

8.5The Standard Path Format..................................................................................................69

VG_PATH_FORMAT_STANDARD.........................................................................................70

8.5.1Path Segment Command Side Effects........................................................................70

8.5.2Segment Commands...................................................................................................71

8.5.3Coordinate Data Formats............................................................................................73

iii

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评论收藏

内容反馈

stonelion1

2013-06-07

没太多看，是我看错了，我以为是opengl呢
progrime

2015-04-25

正宗OPENVG的文件，仔细看了，
natuzero

2014-06-07

非常不错，谢谢！
每天进步一点点

2011-10-28

openvg的文档资料，英文原版的
changjy6322

2014-08-05

感觉还不错，和opengl很像，管线操作，矢量图形

st50886160

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