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replicant-frameworks_native/services/surfaceflinger/LayerBuffer.cpp
Mathias Agopian 74c40c0a27 refactored screenshot code 
the core screenshot function now can capture the screen at any lower resolution
performing bilinear filtering.

we also now have some client code to interface with the screenshot service.

it's now possible to request a screenshot at a lower resolution.

Change-Id: I5a3b0e431421800e3aad601d9af8f94adffbc71f
2010-09-29 16:55:15 -07:00

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/*
* Copyright (C) 2007 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.
*/
#include <stdlib.h>
#include <stdint.h>
#include <math.h>
#include <sys/types.h>
#include <utils/Errors.h>
#include <utils/Log.h>
#include <utils/StopWatch.h>
#include <ui/GraphicBuffer.h>
#include <ui/PixelFormat.h>
#include <ui/FramebufferNativeWindow.h>
#include <ui/Rect.h>
#include <ui/Region.h>
#include <hardware/copybit.h>
#include "LayerBuffer.h"
#include "SurfaceFlinger.h"
#include "DisplayHardware/DisplayHardware.h"
namespace android {
// ---------------------------------------------------------------------------
gralloc_module_t const* LayerBuffer::sGrallocModule = 0;
// ---------------------------------------------------------------------------
LayerBuffer::LayerBuffer(SurfaceFlinger* flinger, DisplayID display,
const sp<Client>& client)
: LayerBaseClient(flinger, display, client),
mNeedsBlending(false), mBlitEngine(0)
{
}
LayerBuffer::~LayerBuffer()
{
if (mBlitEngine) {
copybit_close(mBlitEngine);
}
}
void LayerBuffer::onFirstRef()
{
LayerBaseClient::onFirstRef();
mSurface = new SurfaceLayerBuffer(mFlinger, this);
hw_module_t const* module = (hw_module_t const*)sGrallocModule;
if (!module) {
// NOTE: technically there is a race here, but it shouldn't
// cause any problem since hw_get_module() always returns
// the same value.
if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module) == 0) {
sGrallocModule = (gralloc_module_t const *)module;
}
}
if (hw_get_module(COPYBIT_HARDWARE_MODULE_ID, &module) == 0) {
copybit_open(module, &mBlitEngine);
}
}
sp<LayerBaseClient::Surface> LayerBuffer::createSurface() const
{
return mSurface;
}
status_t LayerBuffer::ditch()
{
mSurface.clear();
return NO_ERROR;
}
bool LayerBuffer::needsBlending() const {
return mNeedsBlending;
}
void LayerBuffer::setNeedsBlending(bool blending) {
mNeedsBlending = blending;
}
void LayerBuffer::postBuffer(ssize_t offset)
{
sp<Source> source(getSource());
if (source != 0)
source->postBuffer(offset);
}
void LayerBuffer::unregisterBuffers()
{
sp<Source> source(clearSource());
if (source != 0)
source->unregisterBuffers();
}
uint32_t LayerBuffer::doTransaction(uint32_t flags)
{
sp<Source> source(getSource());
if (source != 0)
source->onTransaction(flags);
uint32_t res = LayerBase::doTransaction(flags);
// we always want filtering for these surfaces
mNeedsFiltering = !(mFlags & DisplayHardware::SLOW_CONFIG);
return res;
}
void LayerBuffer::unlockPageFlip(const Transform& planeTransform,
Region& outDirtyRegion)
{
// this code-path must be as tight as possible, it's called each time
// the screen is composited.
sp<Source> source(getSource());
if (source != 0)
source->onVisibilityResolved(planeTransform);
LayerBase::unlockPageFlip(planeTransform, outDirtyRegion);
}
void LayerBuffer::drawForSreenShot() const
{
const DisplayHardware& hw(graphicPlane(0).displayHardware());
clearWithOpenGL( Region(hw.bounds()) );
}
void LayerBuffer::onDraw(const Region& clip) const
{
sp<Source> source(getSource());
if (LIKELY(source != 0)) {
source->onDraw(clip);
} else {
clearWithOpenGL(clip);
}
}
void LayerBuffer::serverDestroy()
{
sp<Source> source(clearSource());
if (source != 0) {
source->destroy();
}
}
/**
* This creates a "buffer" source for this surface
*/
status_t LayerBuffer::registerBuffers(const ISurface::BufferHeap& buffers)
{
Mutex::Autolock _l(mLock);
if (mSource != 0)
return INVALID_OPERATION;
sp<BufferSource> source = new BufferSource(*this, buffers);
status_t result = source->getStatus();
if (result == NO_ERROR) {
mSource = source;
}
return result;
}
/**
* This creates an "overlay" source for this surface
*/
sp<OverlayRef> LayerBuffer::createOverlay(uint32_t w, uint32_t h, int32_t f,
int32_t orientation)
{
sp<OverlayRef> result;
Mutex::Autolock _l(mLock);
if (mSource != 0)
return result;
sp<OverlaySource> source = new OverlaySource(*this, &result, w, h, f, orientation);
if (result != 0) {
mSource = source;
}
return result;
}
sp<LayerBuffer::Source> LayerBuffer::getSource() const {
Mutex::Autolock _l(mLock);
return mSource;
}
sp<LayerBuffer::Source> LayerBuffer::clearSource() {
sp<Source> source;
Mutex::Autolock _l(mLock);
source = mSource;
mSource.clear();
return source;
}
// ============================================================================
// LayerBuffer::SurfaceLayerBuffer
// ============================================================================
LayerBuffer::SurfaceLayerBuffer::SurfaceLayerBuffer(
const sp<SurfaceFlinger>& flinger, const sp<LayerBuffer>& owner)
: LayerBaseClient::Surface(flinger, owner->getIdentity(), owner)
{
}
LayerBuffer::SurfaceLayerBuffer::~SurfaceLayerBuffer()
{
unregisterBuffers();
}
status_t LayerBuffer::SurfaceLayerBuffer::registerBuffers(
const ISurface::BufferHeap& buffers)
{
sp<LayerBuffer> owner(getOwner());
if (owner != 0)
return owner->registerBuffers(buffers);
return NO_INIT;
}
void LayerBuffer::SurfaceLayerBuffer::postBuffer(ssize_t offset)
{
sp<LayerBuffer> owner(getOwner());
if (owner != 0)
owner->postBuffer(offset);
}
void LayerBuffer::SurfaceLayerBuffer::unregisterBuffers()
{
sp<LayerBuffer> owner(getOwner());
if (owner != 0)
owner->unregisterBuffers();
}
sp<OverlayRef> LayerBuffer::SurfaceLayerBuffer::createOverlay(
uint32_t w, uint32_t h, int32_t format, int32_t orientation) {
sp<OverlayRef> result;
sp<LayerBuffer> owner(getOwner());
if (owner != 0)
result = owner->createOverlay(w, h, format, orientation);
return result;
}
// ============================================================================
// LayerBuffer::Buffer
// ============================================================================
LayerBuffer::Buffer::Buffer(const ISurface::BufferHeap& buffers,
ssize_t offset, size_t bufferSize)
: mBufferHeap(buffers), mSupportsCopybit(false)
{
NativeBuffer& src(mNativeBuffer);
src.crop.l = 0;
src.crop.t = 0;
src.crop.r = buffers.w;
src.crop.b = buffers.h;
src.img.w = buffers.hor_stride ?: buffers.w;
src.img.h = buffers.ver_stride ?: buffers.h;
src.img.format = buffers.format;
src.img.base = (void*)(intptr_t(buffers.heap->base()) + offset);
src.img.handle = 0;
gralloc_module_t const * module = LayerBuffer::getGrallocModule();
if (module && module->perform) {
int err = module->perform(module,
GRALLOC_MODULE_PERFORM_CREATE_HANDLE_FROM_BUFFER,
buffers.heap->heapID(), bufferSize,
offset, buffers.heap->base(),
&src.img.handle);
// we can fail here is the passed buffer is purely software
mSupportsCopybit = (err == NO_ERROR);
}
}
LayerBuffer::Buffer::~Buffer()
{
NativeBuffer& src(mNativeBuffer);
if (src.img.handle) {
native_handle_delete(src.img.handle);
}
}
// ============================================================================
// LayerBuffer::Source
// LayerBuffer::BufferSource
// LayerBuffer::OverlaySource
// ============================================================================
LayerBuffer::Source::Source(LayerBuffer& layer)
: mLayer(layer)
{
}
LayerBuffer::Source::~Source() {
}
void LayerBuffer::Source::onDraw(const Region& clip) const {
}
void LayerBuffer::Source::onTransaction(uint32_t flags) {
}
void LayerBuffer::Source::onVisibilityResolved(
const Transform& planeTransform) {
}
void LayerBuffer::Source::postBuffer(ssize_t offset) {
}
void LayerBuffer::Source::unregisterBuffers() {
}
// ---------------------------------------------------------------------------
LayerBuffer::BufferSource::BufferSource(LayerBuffer& layer,
const ISurface::BufferHeap& buffers)
: Source(layer), mStatus(NO_ERROR), mBufferSize(0)
{
if (buffers.heap == NULL) {
// this is allowed, but in this case, it is illegal to receive
// postBuffer(). The surface just erases the framebuffer with
// fully transparent pixels.
mBufferHeap = buffers;
mLayer.setNeedsBlending(false);
return;
}
status_t err = (buffers.heap->heapID() >= 0) ? NO_ERROR : NO_INIT;
if (err != NO_ERROR) {
LOGE("LayerBuffer::BufferSource: invalid heap (%s)", strerror(err));
mStatus = err;
return;
}
PixelFormatInfo info;
err = getPixelFormatInfo(buffers.format, &info);
if (err != NO_ERROR) {
LOGE("LayerBuffer::BufferSource: invalid format %d (%s)",
buffers.format, strerror(err));
mStatus = err;
return;
}
if (buffers.hor_stride<0 || buffers.ver_stride<0) {
LOGE("LayerBuffer::BufferSource: invalid parameters "
"(w=%d, h=%d, xs=%d, ys=%d)",
buffers.w, buffers.h, buffers.hor_stride, buffers.ver_stride);
mStatus = BAD_VALUE;
return;
}
mBufferHeap = buffers;
mLayer.setNeedsBlending((info.h_alpha - info.l_alpha) > 0);
mBufferSize = info.getScanlineSize(buffers.hor_stride)*buffers.ver_stride;
mLayer.forceVisibilityTransaction();
}
LayerBuffer::BufferSource::~BufferSource()
{
class MessageDestroyTexture : public MessageBase {
SurfaceFlinger* flinger;
GLuint name;
public:
MessageDestroyTexture(
SurfaceFlinger* flinger, GLuint name)
: flinger(flinger), name(name) { }
virtual bool handler() {
glDeleteTextures(1, &name);
return true;
}
};
if (mTexture.name != -1U) {
// GL textures can only be destroyed from the GL thread
getFlinger()->mEventQueue.postMessage(
new MessageDestroyTexture(getFlinger(), mTexture.name) );
}
if (mTexture.image != EGL_NO_IMAGE_KHR) {
EGLDisplay dpy(getFlinger()->graphicPlane(0).getEGLDisplay());
eglDestroyImageKHR(dpy, mTexture.image);
}
}
void LayerBuffer::BufferSource::postBuffer(ssize_t offset)
{
ISurface::BufferHeap buffers;
{ // scope for the lock
Mutex::Autolock _l(mBufferSourceLock);
buffers = mBufferHeap;
if (buffers.heap != 0) {
const size_t memorySize = buffers.heap->getSize();
if ((size_t(offset) + mBufferSize) > memorySize) {
LOGE("LayerBuffer::BufferSource::postBuffer() "
"invalid buffer (offset=%d, size=%d, heap-size=%d",
int(offset), int(mBufferSize), int(memorySize));
return;
}
}
}
sp<Buffer> buffer;
if (buffers.heap != 0) {
buffer = new LayerBuffer::Buffer(buffers, offset, mBufferSize);
if (buffer->getStatus() != NO_ERROR)
buffer.clear();
setBuffer(buffer);
mLayer.invalidate();
}
}
void LayerBuffer::BufferSource::unregisterBuffers()
{
Mutex::Autolock _l(mBufferSourceLock);
mBufferHeap.heap.clear();
mBuffer.clear();
mLayer.invalidate();
}
sp<LayerBuffer::Buffer> LayerBuffer::BufferSource::getBuffer() const
{
Mutex::Autolock _l(mBufferSourceLock);
return mBuffer;
}
void LayerBuffer::BufferSource::setBuffer(const sp<LayerBuffer::Buffer>& buffer)
{
Mutex::Autolock _l(mBufferSourceLock);
mBuffer = buffer;
}
void LayerBuffer::BufferSource::onDraw(const Region& clip) const
{
sp<Buffer> ourBuffer(getBuffer());
if (UNLIKELY(ourBuffer == 0)) {
// nothing to do, we don't have a buffer
mLayer.clearWithOpenGL(clip);
return;
}
status_t err = NO_ERROR;
NativeBuffer src(ourBuffer->getBuffer());
const Rect transformedBounds(mLayer.getTransformedBounds());
#if defined(EGL_ANDROID_image_native_buffer)
if (GLExtensions::getInstance().haveDirectTexture()) {
err = INVALID_OPERATION;
if (ourBuffer->supportsCopybit()) {
copybit_device_t* copybit = mLayer.mBlitEngine;
if (copybit && err != NO_ERROR) {
// create our EGLImageKHR the first time
err = initTempBuffer();
if (err == NO_ERROR) {
// NOTE: Assume the buffer is allocated with the proper USAGE flags
const NativeBuffer& dst(mTempBuffer);
region_iterator clip(Region(Rect(dst.crop.r, dst.crop.b)));
copybit->set_parameter(copybit, COPYBIT_TRANSFORM, 0);
copybit->set_parameter(copybit, COPYBIT_PLANE_ALPHA, 0xFF);
copybit->set_parameter(copybit, COPYBIT_DITHER, COPYBIT_ENABLE);
err = copybit->stretch(copybit, &dst.img, &src.img,
&dst.crop, &src.crop, &clip);
if (err != NO_ERROR) {
clearTempBufferImage();
}
}
}
}
}
#endif
else {
err = INVALID_OPERATION;
}
if (err != NO_ERROR) {
// slower fallback
GGLSurface t;
t.version = sizeof(GGLSurface);
t.width = src.crop.r;
t.height = src.crop.b;
t.stride = src.img.w;
t.vstride= src.img.h;
t.format = src.img.format;
t.data = (GGLubyte*)src.img.base;
const Region dirty(Rect(t.width, t.height));
mTextureManager.loadTexture(&mTexture, dirty, t);
}
mLayer.setBufferTransform(mBufferHeap.transform);
mLayer.drawWithOpenGL(clip, mTexture);
}
status_t LayerBuffer::BufferSource::initTempBuffer() const
{
// figure out the size we need now
const ISurface::BufferHeap& buffers(mBufferHeap);
uint32_t w = mLayer.mTransformedBounds.width();
uint32_t h = mLayer.mTransformedBounds.height();
if (mLayer.getOrientation() & (Transform::ROT_90 | Transform::ROT_270)) {
int t = w; w = h; h = t;
}
// we're in the copybit case, so make sure we can handle this blit
// we don't have to keep the aspect ratio here
copybit_device_t* copybit = mLayer.mBlitEngine;
const int down = copybit->get(copybit, COPYBIT_MINIFICATION_LIMIT);
const int up = copybit->get(copybit, COPYBIT_MAGNIFICATION_LIMIT);
if (buffers.w > w*down) w = buffers.w / down;
else if (w > buffers.w*up) w = buffers.w*up;
if (buffers.h > h*down) h = buffers.h / down;
else if (h > buffers.h*up) h = buffers.h*up;
if (mTexture.image != EGL_NO_IMAGE_KHR) {
// we have an EGLImage, make sure the needed size didn't change
if (w!=mTexture.width || h!= mTexture.height) {
// delete the EGLImage and texture
clearTempBufferImage();
} else {
// we're good, we have an EGLImageKHR and it's (still) the
// right size
return NO_ERROR;
}
}
// figure out if we need linear filtering
if (buffers.w * h == buffers.h * w) {
// same pixel area, don't use filtering
mLayer.mNeedsFiltering = false;
}
// Allocate a temporary buffer and create the corresponding EGLImageKHR
// once the EGLImage has been created we don't need the
// graphic buffer reference anymore.
sp<GraphicBuffer> buffer = new GraphicBuffer(
w, h, HAL_PIXEL_FORMAT_RGB_565,
GraphicBuffer::USAGE_HW_TEXTURE |
GraphicBuffer::USAGE_HW_2D);
status_t err = buffer->initCheck();
if (err == NO_ERROR) {
NativeBuffer& dst(mTempBuffer);
dst.img.w = buffer->getStride();
dst.img.h = h;
dst.img.format = buffer->getPixelFormat();
dst.img.handle = (native_handle_t *)buffer->handle;
dst.img.base = 0;
dst.crop.l = 0;
dst.crop.t = 0;
dst.crop.r = w;
dst.crop.b = h;
EGLDisplay dpy(getFlinger()->graphicPlane(0).getEGLDisplay());
err = mTextureManager.initEglImage(&mTexture, dpy, buffer);
}
return err;
}
void LayerBuffer::BufferSource::clearTempBufferImage() const
{
// delete the image
EGLDisplay dpy(getFlinger()->graphicPlane(0).getEGLDisplay());
eglDestroyImageKHR(dpy, mTexture.image);
// and the associated texture (recreate a name)
glDeleteTextures(1, &mTexture.name);
Texture defaultTexture;
mTexture = defaultTexture;
}
// ---------------------------------------------------------------------------
LayerBuffer::OverlaySource::OverlaySource(LayerBuffer& layer,
sp<OverlayRef>* overlayRef,
uint32_t w, uint32_t h, int32_t format, int32_t orientation)
: Source(layer), mVisibilityChanged(false),
mOverlay(0), mOverlayHandle(0), mOverlayDevice(0), mOrientation(orientation)
{
overlay_control_device_t* overlay_dev = getFlinger()->getOverlayEngine();
if (overlay_dev == NULL) {
// overlays not supported
return;
}
mOverlayDevice = overlay_dev;
overlay_t* overlay = overlay_dev->createOverlay(overlay_dev, w, h, format);
if (overlay == NULL) {
// couldn't create the overlay (no memory? no more overlays?)
return;
}
// enable dithering...
overlay_dev->setParameter(overlay_dev, overlay,
OVERLAY_DITHER, OVERLAY_ENABLE);
mOverlay = overlay;
mWidth = overlay->w;
mHeight = overlay->h;
mFormat = overlay->format;
mWidthStride = overlay->w_stride;
mHeightStride = overlay->h_stride;
mInitialized = false;
mOverlayHandle = overlay->getHandleRef(overlay);
sp<OverlayChannel> channel = new OverlayChannel( &layer );
*overlayRef = new OverlayRef(mOverlayHandle, channel,
mWidth, mHeight, mFormat, mWidthStride, mHeightStride);
getFlinger()->signalEvent();
}
LayerBuffer::OverlaySource::~OverlaySource()
{
if (mOverlay && mOverlayDevice) {
overlay_control_device_t* overlay_dev = mOverlayDevice;
overlay_dev->destroyOverlay(overlay_dev, mOverlay);
}
}
void LayerBuffer::OverlaySource::onDraw(const Region& clip) const
{
// this would be where the color-key would be set, should we need it.
GLclampf red = 0;
GLclampf green = 0;
GLclampf blue = 0;
mLayer.clearWithOpenGL(clip, red, green, blue, 0);
}
void LayerBuffer::OverlaySource::onTransaction(uint32_t flags)
{
const Layer::State& front(mLayer.drawingState());
const Layer::State& temp(mLayer.currentState());
if (temp.sequence != front.sequence) {
mVisibilityChanged = true;
}
}
void LayerBuffer::OverlaySource::onVisibilityResolved(
const Transform& planeTransform)
{
// this code-path must be as tight as possible, it's called each time
// the screen is composited.
if (UNLIKELY(mOverlay != 0)) {
if (mVisibilityChanged || !mInitialized) {
mVisibilityChanged = false;
mInitialized = true;
const Rect bounds(mLayer.getTransformedBounds());
int x = bounds.left;
int y = bounds.top;
int w = bounds.width();
int h = bounds.height();
// we need a lock here to protect "destroy"
Mutex::Autolock _l(mOverlaySourceLock);
if (mOverlay) {
overlay_control_device_t* overlay_dev = mOverlayDevice;
overlay_dev->setPosition(overlay_dev, mOverlay, x,y,w,h);
// we need to combine the layer orientation and the
// user-requested orientation.
Transform finalTransform = Transform(mOrientation) *
Transform(mLayer.getOrientation());
overlay_dev->setParameter(overlay_dev, mOverlay,
OVERLAY_TRANSFORM, finalTransform.getOrientation());
overlay_dev->commit(overlay_dev, mOverlay);
}
}
}
}
void LayerBuffer::OverlaySource::destroy()
{
// we need a lock here to protect "onVisibilityResolved"
Mutex::Autolock _l(mOverlaySourceLock);
if (mOverlay && mOverlayDevice) {
overlay_control_device_t* overlay_dev = mOverlayDevice;
overlay_dev->destroyOverlay(overlay_dev, mOverlay);
mOverlay = 0;
}
}
// ---------------------------------------------------------------------------
}; // namespace android
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