void GrClip::setFromRect(const GrRect& r) {
fList.reset();
if (r.isEmpty()) {
// use a canonical empty rect for == testing.
setEmpty();
} else {
fList.push_back();
fList.back().fRect = r;
fList.back().fType = kRect_ClipType;
fConservativeBounds = r;
fConservativeBoundsValid = true;
}
}
bool GrGpu::setupClipAndFlushState(GrPrimitiveType type) {
const GrIRect* r = NULL;
GrIRect clipRect;
GrDrawState* drawState = this->drawState();
const GrRenderTarget* rt = drawState->getRenderTarget();
// GrDrawTarget should have filtered this for us
GrAssert(NULL != rt);
if (drawState->isClipState()) {
GrRect bounds;
GrRect rtRect;
rtRect.setLTRB(0, 0,
GrIntToScalar(rt->width()), GrIntToScalar(rt->height()));
if (fClip.hasConservativeBounds()) {
bounds = fClip.getConservativeBounds();
if (!bounds.intersect(rtRect)) {
bounds.setEmpty();
}
} else {
bounds = rtRect;
}
bounds.roundOut(&clipRect);
if (clipRect.isEmpty()) {
clipRect.setLTRB(0,0,0,0);
}
r = &clipRect;
// use the stencil clip if we can't represent the clip as a rectangle.
fClipInStencil = !fClip.isRect() && !fClip.isEmpty() &&
!bounds.isEmpty();
// TODO: dynamically attach a SB when needed.
GrStencilBuffer* stencilBuffer = rt->getStencilBuffer();
if (fClipInStencil && NULL == stencilBuffer) {
return false;
}
if (fClipInStencil &&
stencilBuffer->mustRenderClip(fClip, rt->width(), rt->height())) {
stencilBuffer->setLastClip(fClip, rt->width(), rt->height());
// we set the current clip to the bounds so that our recursive
// draws are scissored to them. We use the copy of the complex clip
// we just stashed on the SB to render from. We set it back after
// we finish drawing it into the stencil.
const GrClip& clip = stencilBuffer->getLastClip();
fClip.setFromRect(bounds);
AutoStateRestore asr(this);
AutoGeometryPush agp(this);
drawState->setViewMatrix(GrMatrix::I());
this->flushScissor(NULL);
#if !VISUALIZE_COMPLEX_CLIP
drawState->enableState(GrDrawState::kNoColorWrites_StateBit);
#else
drawState->disableState(GrDrawState::kNoColorWrites_StateBit);
#endif
int count = clip.getElementCount();
int clipBit = stencilBuffer->bits();
SkASSERT((clipBit <= 16) &&
"Ganesh only handles 16b or smaller stencil buffers");
clipBit = (1 << (clipBit-1));
bool clearToInside;
GrSetOp startOp = kReplace_SetOp; // suppress warning
int start = process_initial_clip_elements(clip,
rtRect,
&clearToInside,
&startOp);
this->clearStencilClip(clipRect, clearToInside);
// walk through each clip element and perform its set op
// with the existing clip.
for (int c = start; c < count; ++c) {
GrPathFill fill;
bool fillInverted;
// enabled at bottom of loop
drawState->disableState(kModifyStencilClip_StateBit);
bool canRenderDirectToStencil; // can the clip element be drawn
// directly to the stencil buffer
// with a non-inverted fill rule
// without extra passes to
// resolve in/out status.
GrPathRenderer* pr = NULL;
const GrPath* clipPath = NULL;
GrPathRenderer::AutoClearPath arp;
if (kRect_ClipType == clip.getElementType(c)) {
canRenderDirectToStencil = true;
fill = kEvenOdd_PathFill;
fillInverted = false;
// there is no point in intersecting a screen filling
// rectangle.
if (kIntersect_SetOp == clip.getOp(c) &&
clip.getRect(c).contains(rtRect)) {
continue;
}
} else {
fill = clip.getPathFill(c);
fillInverted = GrIsFillInverted(fill);
fill = GrNonInvertedFill(fill);
clipPath = &clip.getPath(c);
pr = this->getClipPathRenderer(*clipPath, fill);
if (NULL == pr) {
fClipInStencil = false;
fClip = clip;
return false;
}
canRenderDirectToStencil =
!pr->requiresStencilPass(this, *clipPath, fill);
arp.set(pr, this, clipPath, fill, false, NULL);
}
GrSetOp op = (c == start) ? startOp : clip.getOp(c);
int passes;
GrStencilSettings stencilSettings[GrStencilSettings::kMaxStencilClipPasses];
bool canDrawDirectToClip; // Given the renderer, the element,
// fill rule, and set operation can
// we render the element directly to
// stencil bit used for clipping.
canDrawDirectToClip =
GrStencilSettings::GetClipPasses(op,
canRenderDirectToStencil,
clipBit,
fillInverted,
&passes, stencilSettings);
// draw the element to the client stencil bits if necessary
if (!canDrawDirectToClip) {
GR_STATIC_CONST_SAME_STENCIL(gDrawToStencil,
kIncClamp_StencilOp,
kIncClamp_StencilOp,
kAlways_StencilFunc,
0xffff,
0x0000,
0xffff);
SET_RANDOM_COLOR
if (kRect_ClipType == clip.getElementType(c)) {
*drawState->stencil() = gDrawToStencil;
this->drawSimpleRect(clip.getRect(c), NULL, 0);
} else {
if (canRenderDirectToStencil) {
*drawState->stencil() = gDrawToStencil;
pr->drawPath(0);
} else {
pr->drawPathToStencil();
}
}
}
// now we modify the clip bit by rendering either the clip
// element directly or a bounding rect of the entire clip.
drawState->enableState(kModifyStencilClip_StateBit);
for (int p = 0; p < passes; ++p) {
*drawState->stencil() = stencilSettings[p];
if (canDrawDirectToClip) {
if (kRect_ClipType == clip.getElementType(c)) {
SET_RANDOM_COLOR
this->drawSimpleRect(clip.getRect(c), NULL, 0);
} else {
SET_RANDOM_COLOR
pr->drawPath(0);
}
} else {
SET_RANDOM_COLOR
this->drawSimpleRect(bounds, NULL, 0);
}
}
}
////////////////////////////////////////////////////////////////////////////////
// sort out what kind of clip mask needs to be created: alpha, stencil,
// scissor, or entirely software
bool GrClipMaskManager::createClipMask(GrGpu* gpu,
const GrClip& clipIn,
ScissoringSettings* scissorSettings) {
GrAssert(scissorSettings);
scissorSettings->fEnableScissoring = false;
fClipMaskInStencil = false;
fClipMaskInAlpha = false;
GrDrawState* drawState = gpu->drawState();
if (!drawState->isClipState()) {
return true;
}
GrRenderTarget* rt = drawState->getRenderTarget();
// GrDrawTarget should have filtered this for us
GrAssert(NULL != rt);
#if GR_SW_CLIP
if (create_mask_in_sw()) {
// The clip geometry is complex enough that it will be more
// efficient to create it entirely in software
GrTexture* result = NULL;
GrIRect bound;
if (this->createSoftwareClipMask(gpu, clipIn, &result, &bound)) {
fClipMaskInAlpha = true;
setup_drawstate_aaclip(gpu, result, bound);
return true;
}
}
#endif
#if GR_AA_CLIP
// If MSAA is enabled use the (faster) stencil path for AA clipping
// otherwise the alpha clip mask is our only option
if (clipIn.requiresAA() && 0 == rt->numSamples()) {
// Since we are going to create a destination texture of the correct
// size for the mask (rather than being bound by the size of the
// render target) we aren't going to use scissoring like the stencil
// path does (see scissorSettings below)
GrTexture* result = NULL;
GrIRect bound;
if (this->createAlphaClipMask(gpu, clipIn, &result, &bound)) {
fClipMaskInAlpha = true;
setup_drawstate_aaclip(gpu, result, bound);
return true;
}
// if alpha clip mask creation fails fall through to the stencil
// buffer method
}
#endif // GR_AA_CLIP
GrRect bounds;
GrRect rtRect;
rtRect.setLTRB(0, 0,
GrIntToScalar(rt->width()), GrIntToScalar(rt->height()));
if (clipIn.hasConservativeBounds()) {
bounds = clipIn.getConservativeBounds();
if (!bounds.intersect(rtRect)) {
bounds.setEmpty();
}
} else {
bounds = rtRect;
}
bounds.roundOut(&scissorSettings->fScissorRect);
if (scissorSettings->fScissorRect.isEmpty()) {
scissorSettings->fScissorRect.setLTRB(0,0,0,0);
// TODO: I think we can do an early exit here - after refactoring try:
// set fEnableScissoring to true but leave fClipMaskInStencil false
// and return - everything is going to be scissored away anyway!
}
scissorSettings->fEnableScissoring = true;
// use the stencil clip if we can't represent the clip as a rectangle.
fClipMaskInStencil = !clipIn.isRect() && !clipIn.isEmpty() &&
!bounds.isEmpty();
if (fClipMaskInStencil) {
return this->createStencilClipMask(gpu, clipIn, bounds, scissorSettings);
}
return true;
}
bool GrGpu::setupClipAndFlushState(GrPrimitiveType type) {
const GrIRect* r = NULL;
GrIRect clipRect;
// we check this early because we need a valid
// render target to setup stencil clipping
// before even going into flushGraphicsState
if (NULL == fCurrDrawState.fRenderTarget) {
GrAssert(!"No render target bound.");
return false;
}
if (fCurrDrawState.fFlagBits & kClip_StateBit) {
GrRenderTarget& rt = *fCurrDrawState.fRenderTarget;
GrRect bounds;
GrRect rtRect;
rtRect.setLTRB(0, 0,
GrIntToScalar(rt.width()), GrIntToScalar(rt.height()));
if (fClip.hasConservativeBounds()) {
bounds = fClip.getConservativeBounds();
bounds.intersectWith(rtRect);
} else {
bounds = rtRect;
}
bounds.roundOut(&clipRect);
if (clipRect.isEmpty()) {
clipRect.setLTRB(0,0,0,0);
}
r = &clipRect;
fClipState.fClipInStencil = !fClip.isRect() &&
!fClip.isEmpty() &&
!bounds.isEmpty();
if (fClipState.fClipInStencil &&
(fClipState.fClipIsDirty ||
fClip != rt.fLastStencilClip)) {
rt.fLastStencilClip = fClip;
// we set the current clip to the bounds so that our recursive
// draws are scissored to them. We use the copy of the complex clip
// in the rt to render
const GrClip& clip = rt.fLastStencilClip;
fClip.setFromRect(bounds);
AutoStateRestore asr(this);
AutoInternalDrawGeomRestore aidgr(this);
this->setViewMatrix(GrMatrix::I());
this->eraseStencilClip(clipRect);
this->flushScissor(NULL);
#if !VISUALIZE_COMPLEX_CLIP
this->enableState(kNoColorWrites_StateBit);
#else
this->disableState(kNoColorWrites_StateBit);
#endif
int count = clip.getElementCount();
int clipBit = rt.stencilBits();
clipBit = (1 << (clipBit-1));
// often we'll see the first two elements of the clip are
// the full rt size and another element intersected with it.
// We can skip the first full-size rect and save a big rect draw.
int firstElement = 0;
if (clip.getElementCount() > 1 &&
kRect_ClipType == clip.getElementType(0) &&
kIntersect_SetOp == clip.getOp(1)&&
clip.getRect(0).contains(bounds)) {
firstElement = 1;
}
// walk through each clip element and perform its set op
// with the existing clip.
for (int c = firstElement; c < count; ++c) {
GrPathFill fill;
// enabled at bottom of loop
this->disableState(kModifyStencilClip_StateBit);
bool canDrawDirectToClip;
if (kRect_ClipType == clip.getElementType(c)) {
canDrawDirectToClip = true;
fill = kEvenOdd_PathFill;
} else {
fill = clip.getPathFill(c);
GrPathRenderer* pr = this->getPathRenderer();
canDrawDirectToClip = pr->requiresStencilPass(this, clip.getPath(c), fill);
}
GrSetOp op = firstElement == c ? kReplace_SetOp : clip.getOp(c);
int passes;
GrStencilSettings stencilSettings[GrStencilSettings::kMaxStencilClipPasses];
canDrawDirectToClip = GrStencilSettings::GetClipPasses(op, canDrawDirectToClip,
clipBit, IsFillInverted(fill),
&passes, stencilSettings);
// draw the element to the client stencil bits if necessary
if (!canDrawDirectToClip) {
if (kRect_ClipType == clip.getElementType(c)) {
static const GrStencilSettings gDrawToStencil = {
kIncClamp_StencilOp, kIncClamp_StencilOp,
kIncClamp_StencilOp, kIncClamp_StencilOp,
kAlways_StencilFunc, kAlways_StencilFunc,
0xffffffff, 0xffffffff,
0x00000000, 0x00000000,
0xffffffff, 0xffffffff,
};
this->setStencil(gDrawToStencil);
SET_RANDOM_COLOR
this->drawSimpleRect(clip.getRect(c), NULL, 0);
} else {
SET_RANDOM_COLOR
getPathRenderer()->drawPathToStencil(this, clip.getPath(c),
NonInvertedFill(fill),
NULL);
}
}
// now we modify the clip bit by rendering either the clip
// element directly or a bounding rect of the entire clip.
this->enableState(kModifyStencilClip_StateBit);
for (int p = 0; p < passes; ++p) {
this->setStencil(stencilSettings[p]);
if (canDrawDirectToClip) {
if (kRect_ClipType == clip.getElementType(c)) {
SET_RANDOM_COLOR
this->drawSimpleRect(clip.getRect(c), NULL, 0);
} else {
SET_RANDOM_COLOR
getPathRenderer()->drawPath(this, 0,
clip.getPath(c),
fill, NULL);
}
} else {
SET_RANDOM_COLOR
this->drawSimpleRect(bounds, 0, NULL);
}
}
}
fClip = clip;
// recusive draws would have disabled this.
fClipState.fClipInStencil = true;
}
fClipState.fClipIsDirty = false;
}
// Must flush the scissor after graphics state
if (!this->flushGraphicsState(type)) {
return false;
}
this->flushScissor(r);
return true;
}
////////////////////////////////////////////////////////////////////////////////
// sort out what kind of clip mask needs to be created: alpha, stencil,
// scissor, or entirely software
bool GrClipMaskManager::createClipMask(GrGpu* gpu,
const GrClip& clipIn,
ScissoringSettings* scissorSettings) {
GrAssert(scissorSettings);
scissorSettings->fEnableScissoring = false;
fClipMaskInStencil = false;
fClipMaskInAlpha = false;
GrDrawState* drawState = gpu->drawState();
if (!drawState->isClipState()) {
return true;
}
GrRenderTarget* rt = drawState->getRenderTarget();
// GrDrawTarget should have filtered this for us
GrAssert(NULL != rt);
#if GR_SW_CLIP
// If MSAA is enabled we can do everything in the stencil buffer.
// Otherwise check if we should just create the entire clip mask
// in software (this will only happen if the clip mask is anti-aliased
// and too complex for the gpu to handle in its entirety)
if (0 == rt->numSamples() && useSWOnlyPath(gpu, clipIn)) {
// The clip geometry is complex enough that it will be more
// efficient to create it entirely in software
GrTexture* result = NULL;
GrIRect bound;
if (this->createSoftwareClipMask(gpu, clipIn, &result, &bound)) {
fClipMaskInAlpha = true;
setup_drawstate_aaclip(gpu, result, bound);
return true;
}
// if SW clip mask creation fails fall through to the other
// two possible methods (bottoming out at stencil clipping)
}
#endif // GR_SW_CLIP
#if GR_AA_CLIP
// If MSAA is enabled use the (faster) stencil path for AA clipping
// otherwise the alpha clip mask is our only option
if (0 == rt->numSamples() && clipIn.requiresAA()) {
// Since we are going to create a destination texture of the correct
// size for the mask (rather than being bound by the size of the
// render target) we aren't going to use scissoring like the stencil
// path does (see scissorSettings below)
GrTexture* result = NULL;
GrIRect bound;
if (this->createAlphaClipMask(gpu, clipIn, &result, &bound)) {
fClipMaskInAlpha = true;
setup_drawstate_aaclip(gpu, result, bound);
return true;
}
// if alpha clip mask creation fails fall through to the stencil
// buffer method
}
#endif // GR_AA_CLIP
// Either a hard (stencil buffer) clip was explicitly requested or
// an antialiased clip couldn't be created. In either case, free up
// the texture in the antialiased mask cache.
// TODO: this may require more investigation. Ganesh performs a lot of
// utility draws (e.g., clears, InOrderDrawBuffer playbacks) that hit
// the stencil buffer path. These may be "incorrectly" clearing the
// AA cache.
fAACache.reset();
GrRect bounds;
GrRect rtRect;
rtRect.setLTRB(0, 0,
GrIntToScalar(rt->width()), GrIntToScalar(rt->height()));
if (clipIn.hasConservativeBounds()) {
bounds = clipIn.getConservativeBounds();
if (!bounds.intersect(rtRect)) {
bounds.setEmpty();
}
} else {
bounds = rtRect;
}
bounds.roundOut(&scissorSettings->fScissorRect);
if (scissorSettings->fScissorRect.isEmpty()) {
scissorSettings->fScissorRect.setLTRB(0,0,0,0);
// TODO: I think we can do an early exit here - after refactoring try:
// set fEnableScissoring to true but leave fClipMaskInStencil false
// and return - everything is going to be scissored away anyway!
}
scissorSettings->fEnableScissoring = true;
// use the stencil clip if we can't represent the clip as a rectangle.
fClipMaskInStencil = !clipIn.isRect() && !clipIn.isEmpty() &&
!bounds.isEmpty();
if (fClipMaskInStencil) {
return this->createStencilClipMask(gpu, clipIn, bounds, scissorSettings);
}
return true;
}
