/* * Copyright (C) 2011 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package android.filterpacks.ui; import android.filterfw.core.Filter; import android.filterfw.core.FilterContext; import android.filterfw.core.Frame; import android.filterfw.core.FrameFormat; import android.filterfw.core.GenerateFieldPort; import android.filterfw.core.GenerateFinalPort; import android.filterfw.core.GLEnvironment; import android.filterfw.core.GLFrame; import android.filterfw.core.MutableFrameFormat; import android.filterfw.core.ShaderProgram; import android.filterfw.format.ImageFormat; import android.view.Surface; import android.util.Log; /** * @hide */ public class SurfaceTargetFilter extends Filter { private final int RENDERMODE_STRETCH = 0; private final int RENDERMODE_FIT = 1; private final int RENDERMODE_FILL_CROP = 2; /** Required. 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. */ @GenerateFinalPort(name = "surface") private Surface mSurface; /** Required. Width of the output surface */ @GenerateFieldPort(name = "owidth") private int mScreenWidth; /** Required. Height of the output surface */ @GenerateFieldPort(name = "oheight") private int mScreenHeight; /** Optional. 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. */ @GenerateFieldPort(name = "renderMode", hasDefault = true) private String mRenderModeString; private ShaderProgram mProgram; private GLEnvironment mGlEnv; private GLFrame mScreen; private int mRenderMode = RENDERMODE_FIT; private float mAspectRatio = 1.f; private int mSurfaceId = -1; private boolean mLogVerbose; private static final String TAG = "SurfaceRenderFilter"; public SurfaceTargetFilter(String name) { super(name); mLogVerbose = Log.isLoggable(TAG, Log.VERBOSE); } @Override 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 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(); } @Override public void prepare(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(); } @Override public void open(FilterContext context) { registerSurface(); } @Override public void process(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(); } } @Override public void fieldPortValueUpdated(String name, FilterContext context) { mScreen.setViewport(0, 0, mScreenWidth, mScreenHeight); updateTargetRect(); } @Override public void close(FilterContext context) { unregisterSurface(); } @Override public void tearDown(FilterContext context) { if (mScreen != null) { mScreen.release(); } } 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; } } } private void registerSurface() { mSurfaceId = mGlEnv.registerSurface(mSurface); if (mSurfaceId < 0) { throw new RuntimeException("Could not register Surface: " + mSurface); } } private void unregisterSurface() { if (mSurfaceId > 0) { mGlEnv.unregisterSurfaceId(mSurfaceId); } } }