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add support for [1974164] Be able to take a screen shot on the device 

screenshots are taken using ISurfaceComposer::captureScreen() which returns
the size of the screenshot and an IMemoryHeap containing the data.
screenshots have limitations:
- they will always fail if a secure window is up on screen
- require GL_OES_framebuffer_object extension
- in some situation, video planes won't been captured

Change-Id: I741c68a2d2984fb139039301c3349e6780e2cd58
This commit is contained in:
Mathias Agopian 2010-09-24 11:26:58 -07:00
parent 05c53113e0
commit 1b0b30d043
6 changed files with 201 additions and 1 deletions
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10
include/surfaceflinger/ISurfaceComposer.h
View File

@ -110,6 +110,13 @@ public:
*/
virtual void bootFinished() = 0;
/* Capture the specified screen. requires READ_FRAME_BUFFER permission
* This function will fail if there is a secure window on screen.
*/
virtual status_t captureScreen(DisplayID dpy,
sp<IMemoryHeap>* heap,
uint32_t* width, uint32_t* height, PixelFormat* format) = 0;
/* Signal surfaceflinger that there might be some work to do
* This is an ASYNCHRONOUS call.
*/
@ -133,7 +140,8 @@ public:
SET_ORIENTATION,
FREEZE_DISPLAY,
UNFREEZE_DISPLAY,
SIGNAL
SIGNAL,
CAPTURE_SCREEN
};
virtual status_t onTransact( uint32_t code,

28
libs/surfaceflinger_client/ISurfaceComposer.cpp
View File

@ -124,6 +124,21 @@ public:
remote()->transact(BnSurfaceComposer::BOOT_FINISHED, data, &reply);
}
virtual status_t captureScreen(DisplayID dpy,
sp<IMemoryHeap>* heap,
uint32_t* width, uint32_t* height, PixelFormat* format)
{
Parcel data, reply;
data.writeInterfaceToken(ISurfaceComposer::getInterfaceDescriptor());
data.writeInt32(dpy);
remote()->transact(BnSurfaceComposer::CAPTURE_SCREEN, data, &reply);
*heap = interface_cast<IMemoryHeap>(reply.readStrongBinder());
*width = reply.readInt32();
*height = reply.readInt32();
*format = reply.readInt32();
return reply.readInt32();
}
virtual void signal() const
{
Parcel data, reply;
@ -190,6 +205,19 @@ status_t BnSurfaceComposer::onTransact(
sp<IBinder> b = getCblk()->asBinder();
reply->writeStrongBinder(b);
} break;
case CAPTURE_SCREEN: {
CHECK_INTERFACE(ISurfaceComposer, data, reply);
DisplayID dpy = data.readInt32();
sp<IMemoryHeap> heap;
uint32_t w, h;
PixelFormat f;
status_t res = captureScreen(dpy, &heap, &w, &h, &f);
reply->writeStrongBinder(heap->asBinder());
reply->writeInt32(w);
reply->writeInt32(h);
reply->writeInt32(f);
reply->writeInt32(res);
} break;
default:
return BBinder::onTransact(code, data, reply, flags);
}

4
services/surfaceflinger/GLExtensions.cpp
View File

@ -92,6 +92,10 @@ void GLExtensions::initWithGLStrings(
// hack for Adreno 200
mHaveTextureExternal = true;
}
if (hasExtension("GL_OES_framebuffer_object")) {
mHaveFramebufferObject = true;
}
}
bool GLExtensions::hasExtension(char const* extension) const

5
services/surfaceflinger/GLExtensions.h
View File

@ -39,6 +39,7 @@ class GLExtensions : public Singleton<GLExtensions>
bool mHaveTextureExternal : 1;
bool mHaveNpot : 1;
bool mHaveDirectTexture : 1;
bool mHaveFramebufferObject : 1;
String8 mVendor;
String8 mRenderer;
@ -66,6 +67,10 @@ public:
return mHaveDirectTexture;
}
inline bool haveFramebufferObject() const {
return mHaveFramebufferObject;
}
void initWithGLStrings(
GLubyte const* vendor,
GLubyte const* renderer,

149
services/surfaceflinger/SurfaceFlinger.cpp
View File

@ -75,6 +75,7 @@ SurfaceFlinger::SurfaceFlinger()
mBootTime(systemTime()),
mHardwareTest("android.permission.HARDWARE_TEST"),
mAccessSurfaceFlinger("android.permission.ACCESS_SURFACE_FLINGER"),
mReadFramebuffer("android.permission.READ_FRAME_BUFFER"),
mDump("android.permission.DUMP"),
mVisibleRegionsDirty(false),
mDeferReleaseConsole(false),
@ -1465,8 +1466,23 @@ status_t SurfaceFlinger::onTransact(
"can't access SurfaceFlinger pid=%d, uid=%d", pid, uid);
return PERMISSION_DENIED;
}
break;
}
case CAPTURE_SCREEN:
{
// codes that require permission check
IPCThreadState* ipc = IPCThreadState::self();
const int pid = ipc->getCallingPid();
const int uid = ipc->getCallingUid();
if ((uid != AID_GRAPHICS) && !mReadFramebuffer.check(pid, uid)) {
LOGE("Permission Denial: "
"can't read framebuffer pid=%d, uid=%d", pid, uid);
return PERMISSION_DENIED;
}
break;
}
}
status_t err = BnSurfaceComposer::onTransact(code, data, reply, flags);
if (err == UNKNOWN_TRANSACTION || err == PERMISSION_DENIED) {
CHECK_INTERFACE(ISurfaceComposer, data, reply);
@ -1530,6 +1546,139 @@ status_t SurfaceFlinger::onTransact(
// ---------------------------------------------------------------------------
status_t SurfaceFlinger::captureScreen(DisplayID dpy,
sp<IMemoryHeap>* heap,
uint32_t* width, uint32_t* height, PixelFormat* format)
{
// only one display supported for now
if (UNLIKELY(uint32_t(dpy) >= DISPLAY_COUNT))
return BAD_VALUE;
if (!GLExtensions::getInstance().haveFramebufferObject())
return INVALID_OPERATION;
class MessageCaptureScreen : public MessageBase {
SurfaceFlinger* flinger;
DisplayID dpy;
sp<IMemoryHeap>* heap;
uint32_t* w;
uint32_t* h;
PixelFormat* f;
status_t result;
public:
MessageCaptureScreen(SurfaceFlinger* flinger, DisplayID dpy,
sp<IMemoryHeap>* heap, uint32_t* w, uint32_t* h, PixelFormat* f)
: flinger(flinger), dpy(dpy),
heap(heap), w(w), h(h), f(f), result(PERMISSION_DENIED)
{
}
status_t getResult() const {
return result;
}
virtual bool handler() {
Mutex::Autolock _l(flinger->mStateLock);
// if we have secure windows, never allow the screen capture
if (flinger->mSecureFrameBuffer)
return true;
// make sure to clear all GL error flags
while ( glGetError() != GL_NO_ERROR ) ;
// get screen geometry
const DisplayHardware& hw(flinger->graphicPlane(dpy).displayHardware());
const uint32_t sw = hw.getWidth();
const uint32_t sh = hw.getHeight();
const Region screenBounds(hw.bounds());
const size_t size = sw * sh * 4;
// create a FBO
GLuint name, tname;
glGenRenderbuffersOES(1, &tname);
glBindRenderbufferOES(GL_RENDERBUFFER_OES, tname);
glRenderbufferStorageOES(GL_RENDERBUFFER_OES, GL_RGBA8_OES, sw, sh);
glGenFramebuffersOES(1, &name);
glBindFramebufferOES(GL_FRAMEBUFFER_OES, name);
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES,
GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, tname);
GLenum status = glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES);
if (status == GL_FRAMEBUFFER_COMPLETE_OES) {
// invert everything, b/c glReadPixel() below will invert the FB
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glOrthof(0, sw, 0, sh, 0, 1);
glMatrixMode(GL_MODELVIEW);
// redraw the screen entirely...
glClearColor(0,0,0,1);
glClear(GL_COLOR_BUFFER_BIT);
const Vector< sp<LayerBase> >& layers(
flinger->mVisibleLayersSortedByZ);
const size_t count = layers.size();
for (size_t i=0 ; i<count ; ++i) {
const sp<LayerBase>& layer(layers[i]);
if (!strcmp(layer->getTypeId(), "LayerBuffer")) {
// we cannot render LayerBuffer because it doens't
// use OpenGL, and won't show-up in the FBO.
continue;
}
layer->draw(screenBounds);
}
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
// check for errors and return screen capture
if (glGetError() != GL_NO_ERROR) {
// error while rendering
result = INVALID_OPERATION;
} else {
// allocate shared memory large enough to hold the
// screen capture
sp<MemoryHeapBase> base(
new MemoryHeapBase(size, 0, "screen-capture") );
void* const ptr = base->getBase();
if (ptr) {
// capture the screen with glReadPixels()
glReadPixels(0, 0, sw, sh, GL_RGBA, GL_UNSIGNED_BYTE, ptr);
if (glGetError() == GL_NO_ERROR) {
*heap = base;
*w = sw;
*h = sh;
*f = PIXEL_FORMAT_RGBA_8888;
result = NO_ERROR;
}
} else {
result = NO_MEMORY;
}
}
} else {
result = BAD_VALUE;
}
// release FBO resources
glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
glDeleteRenderbuffersOES(1, &tname);
glDeleteFramebuffersOES(1, &name);
return true;
}
};
sp<MessageBase> msg = new MessageCaptureScreen(this,
dpy, heap, width, height, format);
status_t res = postMessageSync(msg);
if (res == NO_ERROR) {
res = static_cast<MessageCaptureScreen*>( msg.get() )->getResult();
}
return res;
}
// ---------------------------------------------------------------------------
sp<Layer> SurfaceFlinger::getLayer(const sp<ISurface>& sur) const
{
sp<Layer> result;

6
services/surfaceflinger/SurfaceFlinger.h
View File

@ -193,6 +193,11 @@ public:
virtual status_t unfreezeDisplay(DisplayID dpy, uint32_t flags);
virtual int setOrientation(DisplayID dpy, int orientation, uint32_t flags);
virtual void signal() const;
virtual status_t captureScreen(DisplayID dpy,
sp<IMemoryHeap>* heap,
uint32_t* width,
uint32_t* height,
PixelFormat* format);
void screenReleased(DisplayID dpy);
void screenAcquired(DisplayID dpy);
@ -361,6 +366,7 @@ private:
nsecs_t mBootTime;
Permission mHardwareTest;
Permission mAccessSurfaceFlinger;
Permission mReadFramebuffer;
Permission mDump;
// Can only accessed from the main thread, these members