io.cine.android.streaming.gles

Class EglSurfaceBase

java.lang.Object

io.cine.android.streaming.gles.EglSurfaceBase

Direct Known Subclasses:

WindowSurface

public class EglSurfaceBase
extends java.lang.Object

Common base class for EGL surfaces.

There can be multiple surfaces associated with a single context.

Field Summary

Fields

Modifier and Type	Field and Description
protected EglCore	mEglCore
protected static java.lang.String	TAG

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	EglSurfaceBase(EglCore eglCore)

Method Summary

Methods

Modifier and Type	Method and Description
void	createOffscreenSurface(int width, int height) Creates an off-screen surface.
void	createWindowSurface(java.lang.Object surface) Creates a window surface.
int	getHeight() Returns the surface's height, in pixels.
int	getWidth() Returns the surface's width, in pixels.
void	makeCurrent() Makes our EGL context and surface current.
void	makeCurrentReadFrom(EglSurfaceBase readSurface) Makes our EGL context and surface current for drawing, using the supplied surface for reading.
void	releaseEglSurface() Release the EGL surface.
void	saveFrame(ScreenShot screenShot) Saves the EGL surface to a file.
void	setPresentationTime(long nsecs) Sends the presentation time stamp to EGL.
boolean	swapBuffers() Calls eglSwapBuffers.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

TAG

protected static final java.lang.String TAG

See Also:

Constant Field Values

mEglCore

protected EglCore mEglCore

Constructor Detail

EglSurfaceBase

protected EglSurfaceBase(EglCore eglCore)

Method Detail

createWindowSurface

public void createWindowSurface(java.lang.Object surface)

Creates a window surface.

Parameters:

surface - May be a Surface or SurfaceTexture.

createOffscreenSurface

public void createOffscreenSurface(int width,
                          int height)

Creates an off-screen surface.

getWidth

public int getWidth()

Returns the surface's width, in pixels.

If this is called on a window surface, and the underlying surface is in the process of changing size, we may not see the new size right away (e.g. in the "surfaceChanged" callback). The size should match after the next buffer swap.

getHeight

public int getHeight()

Returns the surface's height, in pixels.

releaseEglSurface

public void releaseEglSurface()

Release the EGL surface.

makeCurrent

public void makeCurrent()

Makes our EGL context and surface current.

makeCurrentReadFrom

public void makeCurrentReadFrom(EglSurfaceBase readSurface)

Makes our EGL context and surface current for drawing, using the supplied surface for reading.

swapBuffers

public boolean swapBuffers()

Calls eglSwapBuffers. Use this to "publish" the current frame.

Returns:

false on failure

setPresentationTime

public void setPresentationTime(long nsecs)

Sends the presentation time stamp to EGL.

Parameters:

nsecs - Timestamp, in nanoseconds.

saveFrame

public void saveFrame(ScreenShot screenShot)
               throws java.io.IOException

Saves the EGL surface to a file.

Expects that this object's EGL surface is current. This is an amended version of Grafika's SaveFrame method. We define the ByteBuffer here (rather than in the screenshot object) because the bytebuffer creation really relies on the EGL surface being current and this class is where this is guaranteed. Then the entire process of saving the bitmap, including scaling, etc. happens through the screenshot's saveBitmapFromButter method. To ensure that saving doesn't clog the frame buffering for the camera preview we call it from a runnable in the method. It keeps the app running smoothly and it's cheap on resources

Throws:

java.io.IOException