SurfaceTargetFilterpublic class SurfaceTargetFilter extends android.filterfw.core.Filter
| Fields Summary |
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| private final int | RENDERMODE_STRETCH | | private final int | RENDERMODE_FIT | | private final int | RENDERMODE_FILL_CROP | | private android.view.Surface | mSurfaceRequired. Sets the destination surface for this node. This assumes that
higher-level code is ensuring that the surface is valid, and properly
updates Surface parameters if they change. | | private int | mScreenWidthRequired. Width of the output surface | | private int | mScreenHeightRequired. Height of the output surface | | private String | mRenderModeStringOptional. Control how the incoming frames are rendered onto the
output. Default is FIT.
RENDERMODE_STRETCH: Just fill the output surfaceView.
RENDERMODE_FIT: Keep aspect ratio and fit without cropping. May
have black bars.
RENDERMODE_FILL_CROP: Keep aspect ratio and fit without black
bars. May crop. | | private android.filterfw.core.ShaderProgram | mProgram | | private android.filterfw.core.GLEnvironment | mGlEnv | | private android.filterfw.core.GLFrame | mScreen | | private int | mRenderMode | | private float | mAspectRatio | | private int | mSurfaceId | | private boolean | mLogVerbose | | private static final String | TAG |
| Constructors Summary |
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public SurfaceTargetFilter(String name)
super(name);
mLogVerbose = Log.isLoggable(TAG, Log.VERBOSE);
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| Methods Summary |
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| public void | close(android.filterfw.core.FilterContext context)
unregisterSurface();
| | public void | fieldPortValueUpdated(java.lang.String name, android.filterfw.core.FilterContext context)
mScreen.setViewport(0, 0, mScreenWidth, mScreenHeight);
updateTargetRect();
| | public void | open(android.filterfw.core.FilterContext context)
registerSurface();
| | public void | prepare(android.filterfw.core.FilterContext context)
mGlEnv = context.getGLEnvironment();
// Create identity shader to render, and make sure to render upside-down, as textures
// are stored internally bottom-to-top.
mProgram = ShaderProgram.createIdentity(context);
mProgram.setSourceRect(0, 1, 1, -1);
mProgram.setClearsOutput(true);
mProgram.setClearColor(0.0f, 0.0f, 0.0f);
MutableFrameFormat screenFormat = ImageFormat.create(mScreenWidth,
mScreenHeight,
ImageFormat.COLORSPACE_RGBA,
FrameFormat.TARGET_GPU);
mScreen = (GLFrame)context.getFrameManager().newBoundFrame(screenFormat,
GLFrame.EXISTING_FBO_BINDING,
0);
// Set up cropping
updateRenderMode();
| | public void | process(android.filterfw.core.FilterContext context)
if (mLogVerbose) Log.v(TAG, "Starting frame processing");
// Get input frame
Frame input = pullInput("frame");
boolean createdFrame = false;
float currentAspectRatio = (float)input.getFormat().getWidth() / input.getFormat().getHeight();
if (currentAspectRatio != mAspectRatio) {
if (mLogVerbose) Log.v(TAG, "New aspect ratio: " + currentAspectRatio +", previously: " + mAspectRatio);
mAspectRatio = currentAspectRatio;
updateTargetRect();
}
// See if we need to copy to GPU
Frame gpuFrame = null;
if (mLogVerbose) Log.v("SurfaceRenderFilter", "Got input format: " + input.getFormat());
int target = input.getFormat().getTarget();
if (target != FrameFormat.TARGET_GPU) {
gpuFrame = context.getFrameManager().duplicateFrameToTarget(input,
FrameFormat.TARGET_GPU);
createdFrame = true;
} else {
gpuFrame = input;
}
// Activate our surface
mGlEnv.activateSurfaceWithId(mSurfaceId);
// Process
mProgram.process(gpuFrame, mScreen);
// And swap buffers
mGlEnv.swapBuffers();
if (createdFrame) {
gpuFrame.release();
}
| | private void | registerSurface()
mSurfaceId = mGlEnv.registerSurface(mSurface);
if (mSurfaceId < 0) {
throw new RuntimeException("Could not register Surface: " + mSurface);
}
| | public void | setupPorts()
// Make sure we have a Surface
if (mSurface == null) {
throw new RuntimeException("NULL Surface passed to SurfaceTargetFilter");
}
// Add input port
addMaskedInputPort("frame", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
| | public void | tearDown(android.filterfw.core.FilterContext context)
if (mScreen != null) {
mScreen.release();
}
| | private void | unregisterSurface()
if (mSurfaceId > 0) {
mGlEnv.unregisterSurfaceId(mSurfaceId);
}
| | public void | updateRenderMode()
if (mRenderModeString != null) {
if (mRenderModeString.equals("stretch")) {
mRenderMode = RENDERMODE_STRETCH;
} else if (mRenderModeString.equals("fit")) {
mRenderMode = RENDERMODE_FIT;
} else if (mRenderModeString.equals("fill_crop")) {
mRenderMode = RENDERMODE_FILL_CROP;
} else {
throw new RuntimeException("Unknown render mode '" + mRenderModeString + "'!");
}
}
updateTargetRect();
| | private void | updateTargetRect()
if (mScreenWidth > 0 && mScreenHeight > 0 && mProgram != null) {
float screenAspectRatio = (float)mScreenWidth / mScreenHeight;
float relativeAspectRatio = screenAspectRatio / mAspectRatio;
switch (mRenderMode) {
case RENDERMODE_STRETCH:
mProgram.setTargetRect(0, 0, 1, 1);
break;
case RENDERMODE_FIT:
if (relativeAspectRatio > 1.0f) {
// Screen is wider than the camera, scale down X
mProgram.setTargetRect(0.5f - 0.5f / relativeAspectRatio, 0.0f,
1.0f / relativeAspectRatio, 1.0f);
} else {
// Screen is taller than the camera, scale down Y
mProgram.setTargetRect(0.0f, 0.5f - 0.5f * relativeAspectRatio,
1.0f, relativeAspectRatio);
}
break;
case RENDERMODE_FILL_CROP:
if (relativeAspectRatio > 1) {
// Screen is wider than the camera, crop in Y
mProgram.setTargetRect(0.0f, 0.5f - 0.5f * relativeAspectRatio,
1.0f, relativeAspectRatio);
} else {
// Screen is taller than the camera, crop in X
mProgram.setTargetRect(0.5f - 0.5f / relativeAspectRatio, 0.0f,
1.0f / relativeAspectRatio, 1.0f);
}
break;
}
}
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