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SurfaceFlinger: add a crop to the layer state 

This change adds a crop rectangle specified in window coordinates to the layer
state.  The all window pixels outside this crop rectangle are treated as though
they were fully transparent.  This change also adds the plumbing necessary for
WindowManager to set that crop.

Change-Id: I582bc445dc8c97d4c943d4db8d582a6ef5a66081
This commit is contained in:
Jamie Gennis 2012-05-10 20:43:55 -07:00
parent f30fd01497
commit f15a83f581
13 changed files with 122 additions and 75 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/gui/ISurfaceComposer.h
View File

@ -67,6 +67,7 @@ public:
eTransparentRegionChanged = 0x00000020,
eVisibilityChanged = 0x00000040,
eFreezeTintChanged = 0x00000080,
eCropChanged = 0x00000100,
};
enum {

1
include/gui/Surface.h
View File

@ -72,6 +72,7 @@ public:
status_t setAlpha(float alpha=1.0f);
status_t setMatrix(float dsdx, float dtdx, float dsdy, float dtdy);
status_t setFreezeTint(uint32_t tint);
status_t setCrop(const Rect& crop);
static status_t writeSurfaceToParcel(
const sp<SurfaceControl>& control, Parcel* parcel);

1
include/gui/SurfaceComposerClient.h
View File

@ -127,6 +127,7 @@ public:
status_t setMatrix(SurfaceID id, float dsdx, float dtdx, float dsdy, float dtdy);
status_t setPosition(SurfaceID id, float x, float y);
status_t setSize(SurfaceID id, uint32_t w, uint32_t h);
status_t setCrop(SurfaceID id, const Rect& crop);
status_t destroySurface(SurfaceID sid);
private:

3
include/private/gui/LayerState.h
View File

@ -23,6 +23,7 @@
#include <utils/Errors.h>
#include <ui/Region.h>
#include <ui/Rect.h>
#include <gui/ISurface.h>
namespace android {
@ -40,6 +41,7 @@ struct layer_state_t {
{
matrix.dsdx = matrix.dtdy = 1.0f;
matrix.dsdy = matrix.dtdx = 0.0f;
crop.makeInvalid();
}
status_t write(Parcel& output) const;
@ -64,6 +66,7 @@ struct layer_state_t {
uint8_t mask;
uint8_t reserved;
matrix22_t matrix;
Rect crop;
// non POD must be last. see write/read
Region transparentRegion;
};

2
include/ui/Rect.h
View File

@ -147,7 +147,7 @@ public:
// a ROT90 then the output rectangle is defined in a space extending to
// (height, width). Otherwise the output rectangle is in the same space as
// the input.
Rect transform(uint32_t xform, int32_t width, int32_t height);
Rect transform(uint32_t xform, int32_t width, int32_t height) const;
};
ANDROID_BASIC_TYPES_TRAITS(Rect)

6
libs/gui/Surface.cpp
View File

@ -164,6 +164,12 @@ status_t SurfaceControl::setFreezeTint(uint32_t tint) {
const sp<SurfaceComposerClient>& client(mClient);
return client->setFreezeTint(mToken, tint);
}
status_t SurfaceControl::setCrop(const Rect& crop) {
status_t err = validate();
if (err < 0) return err;
const sp<SurfaceComposerClient>& client(mClient);
return client->setCrop(mToken, crop);
}
status_t SurfaceControl::validate() const
{

17
libs/gui/SurfaceComposerClient.cpp
View File

@ -125,6 +125,8 @@ public:
const sp<SurfaceComposerClient>& client, SurfaceID id,
uint32_t tint);
status_t setOrientation(int orientation);
status_t setCrop(const sp<SurfaceComposerClient>& client, SurfaceID id,
const Rect& crop);
static void closeGlobalTransaction(bool synchronous) {
Composer::getInstance().closeGlobalTransactionImpl(synchronous);
@ -290,6 +292,17 @@ status_t Composer::setOrientation(int orientation) {
return NO_ERROR;
}
status_t Composer::setCrop(const sp<SurfaceComposerClient>& client,
SurfaceID id, const Rect& crop) {
Mutex::Autolock _l(mLock);
layer_state_t* s = getLayerStateLocked(client, id);
if (!s)
return BAD_INDEX;
s->what |= ISurfaceComposer::eCropChanged;
s->crop = crop;
return NO_ERROR;
}
// ---------------------------------------------------------------------------
SurfaceComposerClient::SurfaceComposerClient()
@ -398,6 +411,10 @@ void SurfaceComposerClient::closeGlobalTransaction(bool synchronous) {
// ----------------------------------------------------------------------------
status_t SurfaceComposerClient::setCrop(SurfaceID id, const Rect& crop) {
return getComposer().setCrop(this, id, crop);
}
status_t SurfaceComposerClient::setFreezeTint(SurfaceID id, uint32_t tint) {
return getComposer().setFreezeTint(this, id, tint);
}

2
libs/ui/Rect.cpp
View File

@ -93,7 +93,7 @@ bool Rect::intersect(const Rect& with, Rect* result) const
return !(result->isEmpty());
}
Rect Rect::transform(uint32_t xform, int32_t width, int32_t height) {
Rect Rect::transform(uint32_t xform, int32_t width, int32_t height) const {
Rect result(*this);
if (xform & HAL_TRANSFORM_FLIP_H) {
result = Rect(width - result.right, result.top,

103
services/surfaceflinger/Layer.cpp
View File

@ -141,47 +141,6 @@ void Layer::setName(const String8& name) {
void Layer::validateVisibility(const Transform& globalTransform) {
LayerBase::validateVisibility(globalTransform);
if (mCurrentScalingMode == NATIVE_WINDOW_SCALING_MODE_FREEZE &&
!mCurrentCrop.isEmpty()) {
// We need to shrink the window size to match the buffer crop
// rectangle.
const Layer::State& s(drawingState());
const Transform tr(globalTransform * s.transform);
float windowWidth = s.w;
float windowHeight = s.h;
float bufferWidth = mActiveBuffer->getWidth();
float bufferHeight = mActiveBuffer->getHeight();
if (mCurrentTransform & NATIVE_WINDOW_TRANSFORM_ROT_90) {
float tmp = bufferWidth;
bufferWidth = bufferHeight;
bufferHeight = tmp;
}
float xScale = float(windowWidth) / float(bufferWidth);
float yScale = float(windowHeight) / float(bufferHeight);
// Compute the crop in post-transform coordinates.
Rect crop(mCurrentCrop.transform(mCurrentTransform,
mActiveBuffer->getWidth(), mActiveBuffer->getHeight()));
float left = ceil(xScale * float(crop.left));
float right = floor(xScale * float(crop.right));
float top = ceil(yScale * float(crop.top));
float bottom = floor(yScale * float(crop.bottom));
tr.transform(mVertices[0], left, top);
tr.transform(mVertices[1], left, bottom);
tr.transform(mVertices[2], right, bottom);
tr.transform(mVertices[3], right, top);
const DisplayHardware& hw(graphicPlane(0).displayHardware());
const uint32_t hw_h = hw.getHeight();
for (size_t i=0 ; i<4 ; i++)
mVertices[i][1] = hw_h - mVertices[i][1];
mTransformedBounds = tr.transform(
Rect(int(left), int(top), int(right), int(bottom)));
}
// This optimization allows the SurfaceTexture to bake in
// the rotation so hardware overlays can be used
mSurfaceTexture->setTransformHint(getTransformHint());
@ -259,6 +218,46 @@ status_t Layer::setBuffers( uint32_t w, uint32_t h,
return NO_ERROR;
}
Rect Layer::computeBufferCrop() const {
// Start with the SurfaceTexture's buffer crop...
Rect crop;
if (!mCurrentCrop.isEmpty()) {
crop = mCurrentCrop;
} else if (mActiveBuffer != NULL){
crop = Rect(mActiveBuffer->getWidth(), mActiveBuffer->getHeight());
} else {
crop = Rect(mTransformedBounds.width(), mTransformedBounds.height());
}
// ... then reduce that in the same proportions as the window crop reduces
// the window size.
const State& s(drawingState());
if (!s.crop.isEmpty()) {
// Transform the window crop to match the buffer coordinate system,
// which means using the inverse of the current transform set on the
// SurfaceTexture.
uint32_t invTransform = mCurrentTransform;
int winWidth = s.w;
int winHeight = s.h;
if (invTransform & NATIVE_WINDOW_TRANSFORM_ROT_90) {
invTransform ^= NATIVE_WINDOW_TRANSFORM_FLIP_V |
NATIVE_WINDOW_TRANSFORM_FLIP_H;
winWidth = s.h;
winHeight = s.w;
}
Rect winCrop = s.crop.transform(invTransform, s.w, s.h);
float xScale = float(crop.width()) / float(winWidth);
float yScale = float(crop.height()) / float(winHeight);
crop.left += int(ceil(float(winCrop.left) * xScale));
crop.top += int(ceil(float(winCrop.top) * yScale));
crop.right -= int(ceil(float(winWidth - winCrop.right) * xScale));
crop.bottom -= int(ceil(float(winHeight - winCrop.bottom) * yScale));
}
return crop;
}
void Layer::setGeometry(hwc_layer_t* hwcl)
{
LayerBaseClient::setGeometry(hwcl);
@ -293,23 +292,11 @@ void Layer::setGeometry(hwc_layer_t* hwcl)
hwcl->transform = finalTransform;
}
if (isCropped()) {
hwcl->sourceCrop.left = mCurrentCrop.left;
hwcl->sourceCrop.top = mCurrentCrop.top;
hwcl->sourceCrop.right = mCurrentCrop.right;
hwcl->sourceCrop.bottom = mCurrentCrop.bottom;
} else {
const sp<GraphicBuffer>& buffer(mActiveBuffer);
hwcl->sourceCrop.left = 0;
hwcl->sourceCrop.top = 0;
if (buffer != NULL) {
hwcl->sourceCrop.right = buffer->width;
hwcl->sourceCrop.bottom = buffer->height;
} else {
hwcl->sourceCrop.right = mTransformedBounds.width();
hwcl->sourceCrop.bottom = mTransformedBounds.height();
}
}
Rect crop = computeBufferCrop();
hwcl->sourceCrop.left = crop.left;
hwcl->sourceCrop.top = crop.top;
hwcl->sourceCrop.right = crop.right;
hwcl->sourceCrop.bottom = crop.bottom;
}
void Layer::setPerFrameData(hwc_layer_t* hwcl) {

1
services/surfaceflinger/Layer.h
View File

@ -101,6 +101,7 @@ private:
uint32_t getEffectiveUsage(uint32_t usage) const;
uint32_t getTransformHint() const;
bool isCropped() const;
Rect computeBufferCrop() const;
static bool getOpacityForFormat(uint32_t format);
// -----------------------------------------------------------------------

54
services/surfaceflinger/LayerBase.cpp
View File

@ -93,6 +93,7 @@ void LayerBase::initStates(uint32_t w, uint32_t h, uint32_t flags)
mCurrentState.flags = layerFlags;
mCurrentState.sequence = 0;
mCurrentState.transform.set(0, 0);
mCurrentState.crop.makeInvalid();
// drawing state & current state are identical
mDrawingState = mCurrentState;
@ -172,6 +173,14 @@ bool LayerBase::setFlags(uint8_t flags, uint8_t mask) {
requestTransaction();
return true;
}
bool LayerBase::setCrop(const Rect& crop) {
if (mCurrentState.crop == crop)
return false;
mCurrentState.sequence++;
mCurrentState.crop = crop;
requestTransaction();
return true;
}
Rect LayerBase::visibleBounds() const
{
@ -229,15 +238,18 @@ void LayerBase::validateVisibility(const Transform& planeTransform)
const bool transformed = tr.transformed();
const DisplayHardware& hw(graphicPlane(0).displayHardware());
const uint32_t hw_h = hw.getHeight();
const Rect& crop(s.crop);
uint32_t w = s.w;
uint32_t h = s.h;
Rect win(s.w, s.h);
if (!crop.isEmpty()) {
win.intersect(crop, &win);
}
mNumVertices = 4;
tr.transform(mVertices[0], 0, 0);
tr.transform(mVertices[1], 0, h);
tr.transform(mVertices[2], w, h);
tr.transform(mVertices[3], w, 0);
tr.transform(mVertices[0], win.left, win.top);
tr.transform(mVertices[1], win.left, win.bottom);
tr.transform(mVertices[2], win.right, win.bottom);
tr.transform(mVertices[3], win.right, win.top);
for (size_t i=0 ; i<4 ; i++)
mVertices[i][1] = hw_h - mVertices[i][1];
@ -260,7 +272,7 @@ void LayerBase::validateVisibility(const Transform& planeTransform)
mOrientation = tr.getOrientation();
mPlaneOrientation = planeTransform.getOrientation();
mTransform = tr;
mTransformedBounds = tr.makeBounds(w, h);
mTransformedBounds = tr.transform(win);
}
void LayerBase::lockPageFlip(bool& recomputeVisibleRegions) {
@ -391,15 +403,27 @@ void LayerBase::drawWithOpenGL(const Region& clip) const
GLfloat v;
};
Rect crop(s.w, s.h);
if (!s.crop.isEmpty()) {
crop = s.crop;
}
GLfloat left = GLfloat(crop.left) / GLfloat(s.w);
GLfloat top = GLfloat(crop.top) / GLfloat(s.h);
GLfloat right = GLfloat(crop.right) / GLfloat(s.w);
GLfloat bottom = GLfloat(crop.bottom) / GLfloat(s.h);
TexCoords texCoords[4];
texCoords[0].u = 0;
texCoords[0].v = 1;
texCoords[1].u = 0;
texCoords[1].v = 0;
texCoords[2].u = 1;
texCoords[2].v = 0;
texCoords[3].u = 1;
texCoords[3].v = 1;
texCoords[0].u = left;
texCoords[0].v = top;
texCoords[1].u = left;
texCoords[1].v = bottom;
texCoords[2].u = right;
texCoords[2].v = bottom;
texCoords[3].u = right;
texCoords[3].v = top;
for (int i = 0; i < 4; i++) {
texCoords[i].v = 1.0f - texCoords[i].v;
}
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glVertexPointer(2, GL_FLOAT, 0, mVertices);

2
services/surfaceflinger/LayerBase.h
View File

@ -78,6 +78,7 @@ public:
uint32_t tint;
Transform transform;
Region transparentRegion;
Rect crop;
};
virtual void setName(const String8& name);
@ -91,6 +92,7 @@ public:
bool setMatrix(const layer_state_t::matrix22_t& matrix);
bool setTransparentRegionHint(const Region& opaque);
bool setFlags(uint8_t flags, uint8_t mask);
bool setCrop(const Rect& crop);
void commitTransaction();
bool requestTransaction();

4
services/surfaceflinger/SurfaceFlinger.cpp
View File

@ -1352,6 +1352,10 @@ uint32_t SurfaceFlinger::setClientStateLocked(
if (layer->setFlags(s.flags, s.mask))
flags |= eTraversalNeeded;
}
if (what & eCropChanged) {
if (layer->setCrop(s.crop))
flags |= eTraversalNeeded;
}
}
return flags;
}