bool GrAAHairLinePathRenderer::createLineGeom(const SkPath& path,
GrDrawTarget* target,
const PtArray& lines,
int lineCnt,
GrDrawTarget::AutoReleaseGeometry* arg,
SkRect* devBounds) {
GrDrawState* drawState = target->drawState();
const SkMatrix& viewM = drawState->getViewMatrix();
int vertCnt = kVertsPerLineSeg * lineCnt;
drawState->setVertexAttribs<gHairlineLineAttribs>(SK_ARRAY_COUNT(gHairlineLineAttribs),
sizeof(LineVertex));
if (!arg->set(target, vertCnt, 0)) {
return false;
}
LineVertex* verts = reinterpret_cast<LineVertex*>(arg->vertices());
const SkMatrix* toSrc = NULL;
SkMatrix ivm;
if (viewM.hasPerspective()) {
if (viewM.invert(&ivm)) {
toSrc = &ivm;
}
}
devBounds->set(lines.begin(), lines.count());
for (int i = 0; i < lineCnt; ++i) {
add_line(&lines[2*i], toSrc, drawState->getCoverageColor(), &verts);
}
// All the verts computed by add_line are within sqrt(1^2 + 0.5^2) of the end points.
static const SkScalar kSqrtOfOneAndAQuarter = 1.118f;
// Add a little extra to account for vector normalization precision.
static const SkScalar kOutset = kSqrtOfOneAndAQuarter + SK_Scalar1 / 20;
devBounds->outset(kOutset, kOutset);
return true;
}
void GrTextContext::flushGlyphs() {
if (NULL == fDrawTarget) {
return;
}
GrDrawState* drawState = fDrawTarget->drawState();
if (fCurrVertex > 0) {
// setup our sampler state for our text texture/atlas
drawState->stage(kGlyphMaskStage)->reset();
GrAssert(GrIsALIGN4(fCurrVertex));
GrAssert(fCurrTexture);
GrTextureParams params(SkShader::kRepeat_TileMode, false);
drawState->createTextureEffect(kGlyphMaskStage, fCurrTexture, GrMatrix::I(), params);
if (!GrPixelConfigIsAlphaOnly(fCurrTexture->config())) {
if (kOne_GrBlendCoeff != fPaint.getSrcBlendCoeff() ||
kISA_GrBlendCoeff != fPaint.getDstBlendCoeff() ||
fPaint.hasColorStage()) {
GrPrintf("LCD Text will not draw correctly.\n");
}
// setup blend so that we get mask * paintColor + (1-mask)*dstColor
drawState->setBlendConstant(fPaint.getColor());
drawState->setBlendFunc(kConstC_GrBlendCoeff, kISC_GrBlendCoeff);
// don't modulate by the paint's color in the frag since we're
// already doing it via the blend const.
drawState->setColor(0xffffffff);
} else {
// set back to normal in case we took LCD path previously.
drawState->setBlendFunc(fPaint.getSrcBlendCoeff(), fPaint.getDstBlendCoeff());
drawState->setColor(fPaint.getColor());
}
int nGlyphs = fCurrVertex / 4;
fDrawTarget->setIndexSourceToBuffer(fContext->getQuadIndexBuffer());
fDrawTarget->drawIndexedInstances(kTriangles_GrPrimitiveType,
nGlyphs,
4, 6);
fDrawTarget->resetVertexSource();
fVertices = NULL;
fMaxVertices = 0;
fCurrVertex = 0;
GrSafeSetNull(fCurrTexture);
}
drawState->disableStages();
fDrawTarget = NULL;
}
void GrClipMaskManager::drawTexture(GrTexture* target,
GrTexture* texture) {
GrDrawState* drawState = fGpu->drawState();
GrAssert(NULL != drawState);
// no AA here since it is encoded in the texture
drawState->setRenderTarget(target->asRenderTarget());
GrMatrix sampleM;
sampleM.setIDiv(texture->width(), texture->height());
drawState->sampler(0)->reset(sampleM);
drawState->createTextureEffect(0, texture);
GrRect rect = GrRect::MakeWH(SkIntToScalar(target->width()),
SkIntToScalar(target->height()));
fGpu->drawSimpleRect(rect, NULL);
drawState->disableStage(0);
}
////////////////////////////////////////////////////////////////////////////////
// return true on success; false on failure
bool GrSoftwarePathRenderer::onDrawPath(const SkPath& path,
const SkStrokeRec& stroke,
GrDrawTarget* target,
bool antiAlias) {
if (NULL == fContext) {
return false;
}
GrDrawState* drawState = target->drawState();
SkMatrix vm = drawState->getViewMatrix();
GrIRect devPathBounds, devClipBounds;
if (!get_path_and_clip_bounds(target, path, vm,
&devPathBounds, &devClipBounds)) {
if (path.isInverseFillType()) {
draw_around_inv_path(target, devClipBounds, devPathBounds);
}
return true;
}
SkAutoTUnref<GrTexture> texture(
GrSWMaskHelper::DrawPathMaskToTexture(fContext, path, stroke,
devPathBounds,
antiAlias, &vm));
if (NULL == texture) {
return false;
}
GrSWMaskHelper::DrawToTargetWithPathMask(texture, target, devPathBounds);
if (path.isInverseFillType()) {
draw_around_inv_path(target, devClipBounds, devPathBounds);
}
return true;
}
bool GrClipMaskManager::canStencilAndDrawElement(GrTexture* target,
const SkClipStack::Element* element,
GrPathRenderer** pr) {
GrDrawState* drawState = fGpu->drawState();
drawState->setRenderTarget(target->asRenderTarget());
if (Element::kRect_Type == element->getType()) {
return true;
} else {
// We shouldn't get here with an empty clip element.
SkASSERT(Element::kEmpty_Type != element->getType());
SkPath path;
element->asPath(&path);
if (path.isInverseFillType()) {
path.toggleInverseFillType();
}
SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle);
GrPathRendererChain::DrawType type = element->isAA() ?
GrPathRendererChain::kStencilAndColorAntiAlias_DrawType :
GrPathRendererChain::kStencilAndColor_DrawType;
*pr = this->getContext()->getPathRenderer(path, stroke, fGpu, false, type);
return NULL != *pr;
}
}
GrDrawState::CombinedState GrDrawState::CombineIfPossible(
const GrDrawState& a, const GrDrawState& b, const GrDrawTargetCaps& caps) {
if (!a.isEqual(b)) {
return kIncompatible_CombinedState;
}
// If the general draw states are equal (from check above) we know hasColorVertexAttribute()
// is equivalent for both a and b
if (a.hasColorVertexAttribute()) {
// If one is opaque and the other is not then the combined state is not opaque. Moreover,
// if the opaqueness affects the ability to get color/coverage blending correct then we
// don't combine the draw states.
bool aIsOpaque = (kVertexColorsAreOpaque_Hint & a.fHints);
bool bIsOpaque = (kVertexColorsAreOpaque_Hint & b.fHints);
if (aIsOpaque != bIsOpaque) {
const GrDrawState* opaque;
const GrDrawState* nonOpaque;
if (aIsOpaque) {
opaque = &a;
nonOpaque = &b;
} else {
opaque = &b;
nonOpaque = &a;
}
if (!opaque->hasSolidCoverage() && opaque->couldApplyCoverage(caps)) {
SkASSERT(!nonOpaque->hasSolidCoverage());
if (!nonOpaque->couldApplyCoverage(caps)) {
return kIncompatible_CombinedState;
}
}
return aIsOpaque ? kB_CombinedState : kA_CombinedState;
}
}
return kAOrB_CombinedState;
}
void GrClipMaskManager::drawTexture(GrGpu* gpu,
GrTexture* target,
GrTexture* texture) {
GrDrawState* drawState = gpu->drawState();
GrAssert(NULL != drawState);
// no AA here since it is encoded in the texture
drawState->setRenderTarget(target->asRenderTarget());
GrMatrix sampleM;
sampleM.setIDiv(texture->width(), texture->height());
drawState->setTexture(0, texture);
drawState->sampler(0)->reset(GrSamplerState::kClamp_WrapMode,
GrSamplerState::kNearest_Filter,
sampleM);
GrRect rect = GrRect::MakeWH(SkIntToScalar(target->width()),
SkIntToScalar(target->height()));
gpu->drawSimpleRect(rect, NULL, 1 << 0);
drawState->setTexture(0, NULL);
}
void GrAAHairLinePathRenderer::drawPath(GrDrawState::StageMask stageMask) {
if (!this->createGeom(stageMask)) {
return;
}
GrDrawState* drawState = fTarget->drawState();
GrDrawTarget::AutoStateRestore asr;
if (!drawState->getViewMatrix().hasPerspective()) {
asr.set(fTarget);
GrMatrix ivm;
if (drawState->getViewInverse(&ivm)) {
drawState->preConcatSamplerMatrices(stageMask, ivm);
}
drawState->setViewMatrix(GrMatrix::I());
}
// TODO: See whether rendering lines as degenerate quads improves perf
// when we have a mix
fTarget->setIndexSourceToBuffer(fLinesIndexBuffer);
int lines = 0;
int nBufLines = fLinesIndexBuffer->maxQuads();
while (lines < fLineSegmentCnt) {
int n = GrMin(fLineSegmentCnt-lines, nBufLines);
drawState->setVertexEdgeType(GrDrawState::kHairLine_EdgeType);
fTarget->drawIndexed(kTriangles_PrimitiveType,
kVertsPerLineSeg*lines, // startV
0, // startI
kVertsPerLineSeg*n, // vCount
kIdxsPerLineSeg*n); // iCount
lines += n;
}
fTarget->setIndexSourceToBuffer(fQuadsIndexBuffer);
int quads = 0;
while (quads < fQuadCnt) {
int n = GrMin(fQuadCnt-quads, kNumQuadsInIdxBuffer);
drawState->setVertexEdgeType(GrDrawState::kHairQuad_EdgeType);
fTarget->drawIndexed(kTriangles_PrimitiveType,
4*fLineSegmentCnt + kVertsPerQuad*quads, // startV
0, // startI
kVertsPerQuad*n, // vCount
kIdxsPerQuad*n); // iCount
quads += n;
}
}
void GrGLPathRendering::drawPath(const GrPath* path, SkPath::FillType fill) {
GrGLuint id = static_cast<const GrGLPath*>(path)->pathID();
SkASSERT(NULL != fGpu->drawState()->getRenderTarget());
SkASSERT(NULL != fGpu->drawState()->getRenderTarget()->getStencilBuffer());
this->flushPathStencilSettings(fill);
SkASSERT(!fHWPathStencilSettings.isTwoSided());
const SkStrokeRec& stroke = path->getStroke();
SkPath::FillType nonInvertedFill = SkPath::ConvertToNonInverseFillType(fill);
GrGLenum fillMode =
gr_stencil_op_to_gl_path_rendering_fill_mode(fHWPathStencilSettings.passOp(GrStencilSettings::kFront_Face));
GrGLint writeMask = fHWPathStencilSettings.writeMask(GrStencilSettings::kFront_Face);
if (nonInvertedFill == fill) {
if (stroke.needToApply()) {
if (SkStrokeRec::kStrokeAndFill_Style == stroke.getStyle()) {
GL_CALL(StencilFillPath(id, fillMode, writeMask));
}
this->stencilThenCoverStrokePath(id, 0xffff, writeMask, GR_GL_BOUNDING_BOX);
} else {
this->stencilThenCoverFillPath(id, fillMode, writeMask, GR_GL_BOUNDING_BOX);
}
} else {
if (stroke.isFillStyle() || SkStrokeRec::kStrokeAndFill_Style == stroke.getStyle()) {
GL_CALL(StencilFillPath(id, fillMode, writeMask));
}
if (stroke.needToApply()) {
GL_CALL(StencilStrokePath(id, 0xffff, writeMask));
}
GrDrawState* drawState = fGpu->drawState();
GrDrawState::AutoViewMatrixRestore avmr;
SkRect bounds = SkRect::MakeLTRB(0, 0,
SkIntToScalar(drawState->getRenderTarget()->width()),
SkIntToScalar(drawState->getRenderTarget()->height()));
SkMatrix vmi;
// mapRect through persp matrix may not be correct
if (!drawState->getViewMatrix().hasPerspective() && drawState->getViewInverse(&vmi)) {
vmi.mapRect(&bounds);
// theoretically could set bloat = 0, instead leave it because of matrix inversion
// precision.
SkScalar bloat = drawState->getViewMatrix().getMaxScale() * SK_ScalarHalf;
bounds.outset(bloat, bloat);
} else {
avmr.setIdentity(drawState);
}
fGpu->drawSimpleRect(bounds);
}
}
void GrGLProgram::setColor(const GrDrawState& drawState,
GrColor color,
SharedGLState* sharedState) {
const GrGLProgramDesc::KeyHeader& header = fDesc.getHeader();
if (!drawState.hasColorVertexAttribute()) {
switch (header.fColorInput) {
case GrGLProgramDesc::kAttribute_ColorInput:
SkASSERT(-1 != header.fColorAttributeIndex);
if (sharedState->fConstAttribColor != color ||
sharedState->fConstAttribColorIndex != header.fColorAttributeIndex) {
// OpenGL ES only supports the float varieties of glVertexAttrib
GrGLfloat c[4];
GrColorToRGBAFloat(color, c);
GL_CALL(VertexAttrib4fv(header.fColorAttributeIndex, c));
sharedState->fConstAttribColor = color;
sharedState->fConstAttribColorIndex = header.fColorAttributeIndex;
}
break;
case GrGLProgramDesc::kUniform_ColorInput:
if (fColor != color && fUniformHandles.fColorUni.isValid()) {
// OpenGL ES doesn't support unsigned byte varieties of glUniform
GrGLfloat c[4];
GrColorToRGBAFloat(color, c);
fUniformManager.set4fv(fUniformHandles.fColorUni, 1, c);
fColor = color;
}
sharedState->fConstAttribColorIndex = -1;
break;
case GrGLProgramDesc::kSolidWhite_ColorInput:
case GrGLProgramDesc::kTransBlack_ColorInput:
sharedState->fConstAttribColorIndex = -1;
break;
default:
GrCrash("Unknown color type.");
}
} else {
sharedState->fConstAttribColorIndex = -1;
}
}
void GrOptDrawState::copyEffectiveColorStages(const GrDrawState& ds) {
int firstColorStage = 0;
// Set up color and flags for ConstantColorComponent checks
GrColor color;
uint32_t validComponentFlags;
if (!this->hasColorVertexAttribute()) {
color = ds.getColor();
validComponentFlags = kRGBA_GrColorComponentFlags;
} else {
if (ds.vertexColorsAreOpaque()) {
color = 0xFF << GrColor_SHIFT_A;
validComponentFlags = kA_GrColorComponentFlag;
} else {
validComponentFlags = 0;
color = 0; // not strictly necessary but we get false alarms from tools about uninit.
}
}
for (int i = 0; i < ds.numColorStages(); ++i) {
const GrFragmentProcessor* fp = ds.getColorStage(i).getFragmentProcessor();
if (!fp->willUseInputColor()) {
firstColorStage = i;
fInputColorIsUsed = false;
}
fp->getConstantColorComponents(&color, &validComponentFlags);
if (kRGBA_GrColorComponentFlags == validComponentFlags) {
firstColorStage = i + 1;
fColor = color;
fInputColorIsUsed = true;
this->removeFixedFunctionVertexAttribs(0x1 << kColor_GrVertexAttribBinding);
}
}
if (firstColorStage < ds.numColorStages()) {
fColorStages.reset(&ds.getColorStage(firstColorStage),
ds.numColorStages() - firstColorStage);
} else {
fColorStages.reset();
}
}
void GrGLProgram::setCoverage(const GrDrawState& drawState,
GrColor coverage,
SharedGLState* sharedState) {
const GrGLProgramDesc::KeyHeader& header = fDesc.getHeader();
if (!drawState.hasCoverageVertexAttribute()) {
switch (header.fCoverageInput) {
case GrGLProgramDesc::kAttribute_ColorInput:
if (sharedState->fConstAttribCoverage != coverage ||
sharedState->fConstAttribCoverageIndex != header.fCoverageAttributeIndex) {
// OpenGL ES only supports the float varieties of glVertexAttrib
GrGLfloat c[4];
GrColorToRGBAFloat(coverage, c);
GL_CALL(VertexAttrib4fv(header.fCoverageAttributeIndex, c));
sharedState->fConstAttribCoverage = coverage;
sharedState->fConstAttribCoverageIndex = header.fCoverageAttributeIndex;
}
break;
case GrGLProgramDesc::kUniform_ColorInput:
if (fCoverage != coverage) {
// OpenGL ES doesn't support unsigned byte varieties of glUniform
GrGLfloat c[4];
GrColorToRGBAFloat(coverage, c);
fUniformManager->set4fv(fBuilderOutput.fUniformHandles.fCoverageUni, 1, c);
fCoverage = coverage;
}
sharedState->fConstAttribCoverageIndex = -1;
break;
case GrGLProgramDesc::kSolidWhite_ColorInput:
sharedState->fConstAttribCoverageIndex = -1;
break;
default:
SkFAIL("Unexpected coverage type.");
}
} else {
sharedState->fConstAttribCoverageIndex = -1;
}
}
////////////////////////////////////////////////////////////////////////////////
// Create a 1-bit clip mask in the stencil buffer. 'devClipBounds' are in device
// (as opposed to canvas) coordinates
bool GrClipMaskManager::createStencilClipMask(const GrClipData& clipDataIn,
const GrIRect& devClipBounds) {
GrAssert(kNone_ClipMaskType == fCurrClipMaskType);
GrDrawState* drawState = fGpu->drawState();
GrAssert(drawState->isClipState());
GrRenderTarget* rt = drawState->getRenderTarget();
GrAssert(NULL != rt);
// TODO: dynamically attach a SB when needed.
GrStencilBuffer* stencilBuffer = rt->getStencilBuffer();
if (NULL == stencilBuffer) {
return false;
}
if (stencilBuffer->mustRenderClip(clipDataIn, rt->width(), rt->height())) {
stencilBuffer->setLastClip(clipDataIn, 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 GrClipData* oldClipData = fGpu->getClip();
// The origin of 'newClipData' is (0, 0) so it is okay to place
// a device-coordinate bound in 'newClipStack'
SkClipStack newClipStack(devClipBounds);
GrClipData newClipData;
newClipData.fClipStack = &newClipStack;
fGpu->setClip(&newClipData);
GrDrawTarget::AutoStateRestore asr(fGpu, GrDrawTarget::kReset_ASRInit);
drawState = fGpu->drawState();
drawState->setRenderTarget(rt);
GrDrawTarget::AutoGeometryPush agp(fGpu);
if (0 != clipDataIn.fOrigin.fX || 0 != clipDataIn.fOrigin.fY) {
// Add the saveLayer's offset to the view matrix rather than
// offset each individual draw
drawState->viewMatrix()->setTranslate(
SkIntToScalar(-clipDataIn.fOrigin.fX),
SkIntToScalar(-clipDataIn.fOrigin.fY));
}
#if !VISUALIZE_COMPLEX_CLIP
drawState->enableState(GrDrawState::kNoColorWrites_StateBit);
#endif
int clipBit = stencilBuffer->bits();
SkASSERT((clipBit <= 16) &&
"Ganesh only handles 16b or smaller stencil buffers");
clipBit = (1 << (clipBit-1));
GrIRect devRTRect = GrIRect::MakeWH(rt->width(), rt->height());
bool clearToInside;
SkRegion::Op firstOp = SkRegion::kReplace_Op; // suppress warning
SkClipStack::Iter iter(*oldClipData->fClipStack,
SkClipStack::Iter::kBottom_IterStart);
const SkClipStack::Iter::Clip* clip = process_initial_clip_elements(&iter,
devRTRect,
&clearToInside,
&firstOp,
clipDataIn);
fGpu->clearStencilClip(devClipBounds, clearToInside);
bool first = true;
// walk through each clip element and perform its set op
// with the existing clip.
for ( ; NULL != clip; clip = iter.nextCombined()) {
GrPathFill fill;
bool fillInverted = false;
// enabled at bottom of loop
drawState->disableState(GrGpu::kModifyStencilClip_StateBit);
// if the target is MSAA then we want MSAA enabled when the clip is soft
if (rt->isMultisampled()) {
drawState->setState(GrDrawState::kHWAntialias_StateBit, clip->fDoAA);
}
// 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?
bool canRenderDirectToStencil = false;
SkRegion::Op op = clip->fOp;
if (first) {
first = false;
op = firstOp;
}
GrPathRenderer* pr = NULL;
const SkPath* clipPath = NULL;
if (NULL != clip->fRect) {
canRenderDirectToStencil = true;
fill = kEvenOdd_GrPathFill;
fillInverted = false;
// there is no point in intersecting a screen filling
// rectangle.
if (SkRegion::kIntersect_Op == op &&
contains(*clip->fRect, devRTRect, oldClipData->fOrigin)) {
continue;
}
} else {
GrAssert(NULL != clip->fPath);
fill = get_path_fill(*clip->fPath);
fillInverted = GrIsFillInverted(fill);
fill = GrNonInvertedFill(fill);
clipPath = clip->fPath;
pr = this->getContext()->getPathRenderer(*clipPath, fill, fGpu, false, true);
if (NULL == pr) {
fGpu->setClip(oldClipData);
return false;
}
canRenderDirectToStencil =
!pr->requiresStencilPass(*clipPath, fill, fGpu);
}
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 (NULL != clip->fRect) {
*drawState->stencil() = gDrawToStencil;
fGpu->drawSimpleRect(*clip->fRect, NULL);
} else {
if (canRenderDirectToStencil) {
*drawState->stencil() = gDrawToStencil;
pr->drawPath(*clipPath, fill, fGpu, false);
} else {
pr->drawPathToStencil(*clipPath, fill, fGpu);
}
}
}
// now we modify the clip bit by rendering either the clip
// element directly or a bounding rect of the entire clip.
drawState->enableState(GrGpu::kModifyStencilClip_StateBit);
for (int p = 0; p < passes; ++p) {
*drawState->stencil() = stencilSettings[p];
if (canDrawDirectToClip) {
if (NULL != clip->fRect) {
SET_RANDOM_COLOR
fGpu->drawSimpleRect(*clip->fRect, NULL);
} else {
SET_RANDOM_COLOR
pr->drawPath(*clipPath, fill, fGpu, false);
}
} else {
SET_RANDOM_COLOR
// 'devClipBounds' is already in device coordinates so the
// translation in the view matrix is inappropriate.
// Convert it to canvas space so the drawn rect will
// be in the correct location
GrRect canvClipBounds;
canvClipBounds.set(devClipBounds);
device_to_canvas(&canvClipBounds, clipDataIn.fOrigin);
fGpu->drawSimpleRect(canvClipBounds, NULL);
}
}
}
////////////////////////////////////////////////////////////////////////////////
// Create a 8-bit clip mask in alpha
bool GrClipMaskManager::createAlphaClipMask(const GrClipData& clipDataIn,
GrTexture** result,
GrIRect *devResultBounds) {
GrAssert(NULL != devResultBounds);
GrAssert(kNone_ClipMaskType == fCurrClipMaskType);
if (this->clipMaskPreamble(clipDataIn, result, devResultBounds)) {
fCurrClipMaskType = kAlpha_ClipMaskType;
return true;
}
// Note: 'resultBounds' is in device (as opposed to canvas) coordinates
GrTexture* accum = fAACache.getLastMask();
if (NULL == accum) {
fAACache.reset();
return false;
}
GrDrawTarget::AutoStateRestore asr(fGpu, GrDrawTarget::kReset_ASRInit);
GrDrawState* drawState = fGpu->drawState();
GrDrawTarget::AutoGeometryPush agp(fGpu);
// The mask we generate is translated so that its upper-left corner is at devResultBounds
// upper-left corner in device space.
GrIRect maskResultBounds = GrIRect::MakeWH(devResultBounds->width(), devResultBounds->height());
// Set the matrix so that rendered clip elements are transformed from the space of the clip
// stack to the alpha-mask. This accounts for both translation due to the clip-origin and the
// placement of the mask within the device.
SkVector clipToMaskOffset = {
SkIntToScalar(-devResultBounds->fLeft - clipDataIn.fOrigin.fX),
SkIntToScalar(-devResultBounds->fTop - clipDataIn.fOrigin.fY)
};
drawState->viewMatrix()->setTranslate(clipToMaskOffset);
bool clearToInside;
SkRegion::Op firstOp = SkRegion::kReplace_Op; // suppress warning
SkClipStack::Iter iter(*clipDataIn.fClipStack,
SkClipStack::Iter::kBottom_IterStart);
const SkClipStack::Iter::Clip* clip = process_initial_clip_elements(&iter,
*devResultBounds,
&clearToInside,
&firstOp,
clipDataIn);
// The scratch texture that we are drawing into can be substantially larger than the mask. Only
// clear the part that we care about.
fGpu->clear(&maskResultBounds,
clearToInside ? 0xffffffff : 0x00000000,
accum->asRenderTarget());
bool accumClearedToZero = !clearToInside;
GrAutoScratchTexture temp;
bool first = true;
// walk through each clip element and perform its set op
for ( ; NULL != clip; clip = iter.nextCombined()) {
SkRegion::Op op = clip->fOp;
if (first) {
first = false;
op = firstOp;
}
if (SkRegion::kReplace_Op == op) {
// clear the accumulator and draw the new object directly into it
if (!accumClearedToZero) {
fGpu->clear(&maskResultBounds, 0x00000000, accum->asRenderTarget());
}
setup_boolean_blendcoeffs(drawState, op);
this->drawClipShape(accum, clip, *devResultBounds);
} else if (SkRegion::kReverseDifference_Op == op ||
SkRegion::kIntersect_Op == op) {
// there is no point in intersecting a screen filling rectangle.
if (SkRegion::kIntersect_Op == op && NULL != clip->fRect &&
contains(*clip->fRect, *devResultBounds, clipDataIn.fOrigin)) {
continue;
}
getTemp(*devResultBounds, &temp);
if (NULL == temp.texture()) {
fAACache.reset();
return false;
}
// this is the bounds of the clip element in the space of the alpha-mask. The temporary
// mask buffer can be substantially larger than the actually clip stack element. We
// touch the minimum number of pixels necessary and use decal mode to combine it with
// the accumulator
GrRect elementMaskBounds = clip->getBounds();
elementMaskBounds.offset(clipToMaskOffset);
GrIRect elementMaskIBounds;
elementMaskBounds.roundOut(&elementMaskIBounds);
// clear the temp target & draw into it
fGpu->clear(&elementMaskIBounds, 0x00000000, temp.texture()->asRenderTarget());
setup_boolean_blendcoeffs(drawState, SkRegion::kReplace_Op);
this->drawClipShape(temp.texture(), clip, elementMaskIBounds);
// Now draw into the accumulator using the real operation
// and the temp buffer as a texture
this->mergeMask(accum, temp.texture(), op, maskResultBounds, elementMaskIBounds);
} else {
// all the remaining ops can just be directly draw into
// the accumulation buffer
setup_boolean_blendcoeffs(drawState, op);
this->drawClipShape(accum, clip, *devResultBounds);
}
accumClearedToZero = false;
}
*result = accum;
fCurrClipMaskType = kAlpha_ClipMaskType;
return true;
}
////////////////////////////////////////////////////////////////////////////////
// sort out what kind of clip mask needs to be created: alpha, stencil,
// scissor, or entirely software
bool GrClipMaskManager::setupClipping(const GrClipData* clipDataIn) {
fCurrClipMaskType = kNone_ClipMaskType;
GrDrawState* drawState = fGpu->drawState();
if (!drawState->isClipState() || clipDataIn->fClipStack->isWideOpen()) {
fGpu->disableScissor();
this->setGpuStencil();
return true;
}
GrRenderTarget* rt = drawState->getRenderTarget();
// GrDrawTarget should have filtered this for us
GrAssert(NULL != rt);
GrIRect devClipBounds;
bool isIntersectionOfRects = false;
clipDataIn->getConservativeBounds(rt, &devClipBounds, &isIntersectionOfRects);
if (devClipBounds.isEmpty()) {
return false;
}
#if GR_SW_CLIP
bool requiresAA = requires_AA(*clipDataIn->fClipStack);
// 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() &&
requiresAA &&
this->useSWOnlyPath(*clipDataIn->fClipStack)) {
// The clip geometry is complex enough that it will be more
// efficient to create it entirely in software
GrTexture* result = NULL;
GrIRect devBound;
if (this->createSoftwareClipMask(*clipDataIn, &result, &devBound)) {
setup_drawstate_aaclip(fGpu, result, devBound);
fGpu->disableScissor();
this->setGpuStencil();
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() && 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 devBound;
if (this->createAlphaClipMask(*clipDataIn, &result, &devBound)) {
setup_drawstate_aaclip(fGpu, result, devBound);
fGpu->disableScissor();
this->setGpuStencil();
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();
// If the clip is a rectangle then just set the scissor. Otherwise, create
// a stencil mask.
if (isIntersectionOfRects) {
fGpu->enableScissor(devClipBounds);
this->setGpuStencil();
return true;
}
// use the stencil clip if we can't represent the clip as a rectangle.
bool useStencil = !clipDataIn->fClipStack->isWideOpen() &&
!devClipBounds.isEmpty();
if (useStencil) {
this->createStencilClipMask(*clipDataIn, devClipBounds);
}
// This must occur after createStencilClipMask. That function may change
// the scissor. Also, it only guarantees that the stencil mask is correct
// within the bounds it was passed, so we must use both stencil and scissor
// test to the bounds for the final draw.
fGpu->enableScissor(devClipBounds);
this->setGpuStencil();
return true;
}
bool GrAAConvexPathRenderer::onDrawPath(const SkPath& origPath,
GrPathFill fill,
GrDrawTarget* target,
bool antiAlias) {
const SkPath* path = &origPath;
if (path->isEmpty()) {
return true;
}
GrDrawState* drawState = target->drawState();
GrDrawState::AutoDeviceCoordDraw adcd(drawState);
if (!adcd.succeeded()) {
return false;
}
const GrMatrix* vm = &adcd.getOriginalMatrix();
GrVertexLayout layout = 0;
layout |= GrDrawTarget::kEdge_VertexLayoutBit;
// We use the fact that SkPath::transform path does subdivision based on
// perspective. Otherwise, we apply the view matrix when copying to the
// segment representation.
SkPath tmpPath;
if (vm->hasPerspective()) {
origPath.transform(*vm, &tmpPath);
path = &tmpPath;
vm = &GrMatrix::I();
}
QuadVertex *verts;
uint16_t* idxs;
int vCount;
int iCount;
enum {
kPreallocSegmentCnt = 512 / sizeof(Segment),
};
SkSTArray<kPreallocSegmentCnt, Segment, true> segments;
SkPoint fanPt;
if (!get_segments(*path, *vm, &segments, &fanPt, &vCount, &iCount)) {
return false;
}
GrDrawTarget::AutoReleaseGeometry arg(target, layout, vCount, iCount);
if (!arg.succeeded()) {
return false;
}
verts = reinterpret_cast<QuadVertex*>(arg.vertices());
idxs = reinterpret_cast<uint16_t*>(arg.indices());
create_vertices(segments, fanPt, verts, idxs);
GrDrawState::VertexEdgeType oldEdgeType = drawState->getVertexEdgeType();
drawState->setVertexEdgeType(GrDrawState::kQuad_EdgeType);
target->drawIndexed(kTriangles_GrPrimitiveType,
0, // start vertex
0, // start index
vCount,
iCount);
drawState->setVertexEdgeType(oldEdgeType);
return true;
}
bool GrTesselatedPathRenderer::onDrawPath(const SkPath& path,
GrPathFill fill,
const GrVec* translate,
GrDrawTarget* target,
GrDrawState::StageMask stageMask,
bool antiAlias) {
GrDrawTarget::AutoStateRestore asr(target);
GrDrawState* drawState = target->drawState();
// face culling doesn't make sense here
GrAssert(GrDrawState::kBoth_DrawFace == drawState->getDrawFace());
GrMatrix viewM = drawState->getViewMatrix();
GrScalar tol = GR_Scalar1;
tol = GrPathUtils::scaleToleranceToSrc(tol, viewM, path.getBounds());
GrScalar tolSqd = GrMul(tol, tol);
int subpathCnt;
int maxPts = GrPathUtils::worstCasePointCount(path, &subpathCnt, tol);
GrVertexLayout layout = 0;
for (int s = 0; s < GrDrawState::kNumStages; ++s) {
if ((1 << s) & stageMask) {
layout |= GrDrawTarget::StagePosAsTexCoordVertexLayoutBit(s);
}
}
bool inverted = GrIsFillInverted(fill);
if (inverted) {
maxPts += 4;
subpathCnt++;
}
if (maxPts > USHRT_MAX) {
return false;
}
SkAutoSTMalloc<8, GrPoint> baseMem(maxPts);
GrPoint* base = baseMem;
GrPoint* vert = base;
GrPoint* subpathBase = base;
SkAutoSTMalloc<8, uint16_t> subpathVertCount(subpathCnt);
GrPoint pts[4];
SkPath::Iter iter(path, false);
bool first = true;
int subpath = 0;
for (;;) {
switch (iter.next(pts)) {
case kMove_PathCmd:
if (!first) {
subpathVertCount[subpath] = vert-subpathBase;
subpathBase = vert;
++subpath;
}
*vert = pts[0];
vert++;
break;
case kLine_PathCmd:
*vert = pts[1];
vert++;
break;
case kQuadratic_PathCmd: {
GrPathUtils::generateQuadraticPoints(pts[0], pts[1], pts[2],
tolSqd, &vert,
GrPathUtils::quadraticPointCount(pts, tol));
break;
}
case kCubic_PathCmd: {
GrPathUtils::generateCubicPoints(pts[0], pts[1], pts[2], pts[3],
tolSqd, &vert,
GrPathUtils::cubicPointCount(pts, tol));
break;
}
case kClose_PathCmd:
break;
case kEnd_PathCmd:
subpathVertCount[subpath] = vert-subpathBase;
++subpath; // this could be only in debug
goto FINISHED;
}
first = false;
}
FINISHED:
if (NULL != translate && 0 != translate->fX && 0 != translate->fY) {
for (int i = 0; i < vert - base; i++) {
base[i].offset(translate->fX, translate->fY);
}
}
if (inverted) {
GrRect bounds;
GrAssert(NULL != drawState->getRenderTarget());
bounds.setLTRB(0, 0,
GrIntToScalar(drawState->getRenderTarget()->width()),
GrIntToScalar(drawState->getRenderTarget()->height()));
GrMatrix vmi;
if (drawState->getViewInverse(&vmi)) {
vmi.mapRect(&bounds);
}
*vert++ = GrPoint::Make(bounds.fLeft, bounds.fTop);
*vert++ = GrPoint::Make(bounds.fLeft, bounds.fBottom);
*vert++ = GrPoint::Make(bounds.fRight, bounds.fBottom);
*vert++ = GrPoint::Make(bounds.fRight, bounds.fTop);
subpathVertCount[subpath++] = 4;
}
GrAssert(subpath == subpathCnt);
GrAssert((vert - base) <= maxPts);
size_t count = vert - base;
if (count < 3) {
return true;
}
if (subpathCnt == 1 && !inverted && path.isConvex()) {
if (antiAlias) {
GrEdgeArray edges;
GrMatrix inverse, matrix = drawState->getViewMatrix();
drawState->getViewInverse(&inverse);
count = computeEdgesAndIntersect(matrix, inverse, base, count, &edges, 0.0f);
size_t maxEdges = target->getMaxEdges();
if (count == 0) {
return true;
}
if (count <= maxEdges) {
// All edges fit; upload all edges and draw all verts as a fan
target->setVertexSourceToArray(layout, base, count);
drawState->setEdgeAAData(&edges[0], count);
target->drawNonIndexed(kTriangleFan_PrimitiveType, 0, count);
} else {
// Upload "maxEdges" edges and verts at a time, and draw as
// separate fans
for (size_t i = 0; i < count - 2; i += maxEdges - 2) {
edges[i] = edges[0];
base[i] = base[0];
int size = GR_CT_MIN(count - i, maxEdges);
target->setVertexSourceToArray(layout, &base[i], size);
drawState->setEdgeAAData(&edges[i], size);
target->drawNonIndexed(kTriangleFan_PrimitiveType, 0, size);
}
}
drawState->setEdgeAAData(NULL, 0);
} else {
target->setVertexSourceToArray(layout, base, count);
target->drawNonIndexed(kTriangleFan_PrimitiveType, 0, count);
}
return true;
}
if (antiAlias) {
// Run the tesselator once to get the boundaries.
GrBoundaryTess btess(count, fill_type_to_glu_winding_rule(fill));
btess.addVertices(base, subpathVertCount, subpathCnt);
GrMatrix inverse, matrix = drawState->getViewMatrix();
if (!drawState->getViewInverse(&inverse)) {
return false;
}
if (btess.vertices().count() > USHRT_MAX) {
return false;
}
// Inflate the boundary, and run the tesselator again to generate
// interior polys.
const GrPointArray& contourPoints = btess.contourPoints();
const GrIndexArray& contours = btess.contours();
GrEdgePolygonTess ptess(contourPoints.count(), GLU_TESS_WINDING_NONZERO, matrix);
size_t i = 0;
Sk_gluTessBeginPolygon(ptess.tess(), &ptess);
for (int contour = 0; contour < contours.count(); ++contour) {
int count = contours[contour];
GrEdgeArray edges;
int newCount = computeEdgesAndIntersect(matrix, inverse, &btess.contourPoints()[i], count, &edges, 1.0f);
Sk_gluTessBeginContour(ptess.tess());
for (int j = 0; j < newCount; j++) {
ptess.addVertex(contourPoints[i + j], ptess.vertices().count());
}
i += count;
Sk_gluTessEndContour(ptess.tess());
}
Sk_gluTessEndPolygon(ptess.tess());
if (ptess.vertices().count() > USHRT_MAX) {
return false;
}
// Draw the resulting polys and upload their edge data.
drawState->enableState(GrDrawState::kEdgeAAConcave_StateBit);
const GrPointArray& vertices = ptess.vertices();
const GrIndexArray& indices = ptess.indices();
const GrDrawState::Edge* edges = ptess.edges();
GR_DEBUGASSERT(indices.count() % 3 == 0);
for (int i = 0; i < indices.count(); i += 3) {
GrPoint tri_verts[3];
int index0 = indices[i];
int index1 = indices[i + 1];
int index2 = indices[i + 2];
tri_verts[0] = vertices[index0];
tri_verts[1] = vertices[index1];
tri_verts[2] = vertices[index2];
GrDrawState::Edge tri_edges[6];
int t = 0;
const GrDrawState::Edge& edge0 = edges[index0 * 2];
const GrDrawState::Edge& edge1 = edges[index0 * 2 + 1];
const GrDrawState::Edge& edge2 = edges[index1 * 2];
const GrDrawState::Edge& edge3 = edges[index1 * 2 + 1];
const GrDrawState::Edge& edge4 = edges[index2 * 2];
const GrDrawState::Edge& edge5 = edges[index2 * 2 + 1];
if (validEdge(edge0) && validEdge(edge1)) {
tri_edges[t++] = edge0;
tri_edges[t++] = edge1;
}
if (validEdge(edge2) && validEdge(edge3)) {
tri_edges[t++] = edge2;
tri_edges[t++] = edge3;
}
if (validEdge(edge4) && validEdge(edge5)) {
tri_edges[t++] = edge4;
tri_edges[t++] = edge5;
}
drawState->setEdgeAAData(&tri_edges[0], t);
target->setVertexSourceToArray(layout, &tri_verts[0], 3);
target->drawNonIndexed(kTriangles_PrimitiveType, 0, 3);
}
drawState->setEdgeAAData(NULL, 0);
drawState->disableState(GrDrawState::kEdgeAAConcave_StateBit);
return true;
}
GrPolygonTess ptess(count, fill_type_to_glu_winding_rule(fill));
ptess.addVertices(base, subpathVertCount, subpathCnt);
const GrPointArray& vertices = ptess.vertices();
const GrIndexArray& indices = ptess.indices();
if (indices.count() > 0) {
target->setVertexSourceToArray(layout, vertices.begin(), vertices.count());
target->setIndexSourceToArray(indices.begin(), indices.count());
target->drawIndexed(kTriangles_PrimitiveType,
0,
0,
vertices.count(),
indices.count());
}
return true;
}
bool GrClipMaskManager::installClipEffects(const ElementList& elements,
GrDrawState::AutoRestoreEffects* are,
const SkVector& clipToRTOffset,
const SkRect* drawBounds) {
GrDrawState* drawState = fGpu->drawState();
SkRect boundsInClipSpace;
if (NULL != drawBounds) {
boundsInClipSpace = *drawBounds;
boundsInClipSpace.offset(-clipToRTOffset.fX, -clipToRTOffset.fY);
}
are->set(drawState);
GrRenderTarget* rt = drawState->getRenderTarget();
ElementList::Iter iter(elements);
bool setARE = false;
bool failed = false;
while (NULL != iter.get()) {
SkRegion::Op op = iter.get()->getOp();
bool invert;
bool skip = false;
switch (op) {
case SkRegion::kReplace_Op:
SkASSERT(iter.get() == elements.head());
// Fallthrough, handled same as intersect.
case SkRegion::kIntersect_Op:
invert = false;
if (NULL != drawBounds && iter.get()->contains(boundsInClipSpace)) {
skip = true;
}
break;
case SkRegion::kDifference_Op:
invert = true;
// We don't currently have a cheap test for whether a rect is fully outside an
// element's primitive, so don't attempt to set skip.
break;
default:
failed = true;
break;
}
if (failed) {
break;
}
if (!skip) {
GrEffectEdgeType edgeType;
if (GR_AA_CLIP && iter.get()->isAA()) {
if (rt->isMultisampled()) {
// Coverage based AA clips don't place nicely with MSAA.
failed = true;
break;
}
edgeType = invert ? kInverseFillAA_GrEffectEdgeType : kFillAA_GrEffectEdgeType;
} else {
edgeType = invert ? kInverseFillBW_GrEffectEdgeType : kFillBW_GrEffectEdgeType;
}
SkAutoTUnref<GrEffectRef> effect;
switch (iter.get()->getType()) {
case SkClipStack::Element::kPath_Type:
effect.reset(GrConvexPolyEffect::Create(edgeType, iter.get()->getPath(),
&clipToRTOffset));
break;
case SkClipStack::Element::kRRect_Type: {
SkRRect rrect = iter.get()->getRRect();
rrect.offset(clipToRTOffset.fX, clipToRTOffset.fY);
effect.reset(GrRRectEffect::Create(edgeType, rrect));
break;
}
case SkClipStack::Element::kRect_Type: {
SkRect rect = iter.get()->getRect();
rect.offset(clipToRTOffset.fX, clipToRTOffset.fY);
effect.reset(GrConvexPolyEffect::Create(edgeType, rect));
break;
}
default:
break;
}
if (effect) {
if (!setARE) {
are->set(fGpu->drawState());
setARE = true;
}
fGpu->drawState()->addCoverageEffect(effect);
} else {
failed = true;
break;
}
}
iter.next();
}
if (failed) {
are->set(NULL);
}
return !failed;
}
bool GrStencilAndCoverPathRenderer::onDrawPath(const SkPath& path,
GrPathFill fill,
GrDrawTarget* target,
bool antiAlias) {
GrAssert(!antiAlias);
GrAssert(kHairLine_GrPathFill != fill);
GrDrawState* drawState = target->drawState();
GrAssert(drawState->getStencil().isDisabled());
SkAutoTUnref<GrPath> p(fGpu->createPath(path));
GrPathFill nonInvertedFill = GrNonInvertedFill(fill);
target->stencilPath(p, nonInvertedFill);
// TODO: Use built in cover operation rather than a rect draw. This will require making our
// fragment shaders be able to eat varyings generated by a matrix.
// fill the path, zero out the stencil
GrRect bounds = p->getBounds();
GrScalar bloat = drawState->getViewMatrix().getMaxStretch() * GR_ScalarHalf;
GrDrawState::AutoDeviceCoordDraw adcd;
if (nonInvertedFill == fill) {
GR_STATIC_CONST_SAME_STENCIL(kStencilPass,
kZero_StencilOp,
kZero_StencilOp,
kNotEqual_StencilFunc,
0xffff,
0x0000,
0xffff);
*drawState->stencil() = kStencilPass;
} else {
GR_STATIC_CONST_SAME_STENCIL(kInvertedStencilPass,
kZero_StencilOp,
kZero_StencilOp,
// We know our rect will hit pixels outside the clip and the user bits will be 0
// outside the clip. So we can't just fill where the user bits are 0. We also need to
// check that the clip bit is set.
kEqualIfInClip_StencilFunc,
0xffff,
0x0000,
0xffff);
GrMatrix vmi;
bounds.setLTRB(0, 0,
GrIntToScalar(drawState->getRenderTarget()->width()),
GrIntToScalar(drawState->getRenderTarget()->height()));
// mapRect through persp matrix may not be correct
if (!drawState->getViewMatrix().hasPerspective() && drawState->getViewInverse(&vmi)) {
vmi.mapRect(&bounds);
// theoretically could set bloat = 0, instead leave it because of matrix inversion
// precision.
} else {
adcd.set(drawState);
bloat = 0;
}
*drawState->stencil() = kInvertedStencilPass;
}
bounds.outset(bloat, bloat);
target->drawSimpleRect(bounds, NULL);
target->drawState()->stencil()->setDisabled();
return true;
}
////////////////////////////////////////////////////////////////////////////////
// Create a 1-bit clip mask in the stencil buffer
bool GrClipMaskManager::createStencilClipMask(GrGpu* gpu,
const GrClip& clipIn,
const GrRect& bounds,
ScissoringSettings* scissorSettings) {
GrAssert(fClipMaskInStencil);
GrDrawState* drawState = gpu->drawState();
GrAssert(drawState->isClipState());
GrRenderTarget* rt = drawState->getRenderTarget();
GrAssert(NULL != rt);
// TODO: dynamically attach a SB when needed.
GrStencilBuffer* stencilBuffer = rt->getStencilBuffer();
if (NULL == stencilBuffer) {
return false;
}
if (stencilBuffer->mustRenderClip(clipIn, rt->width(), rt->height())) {
stencilBuffer->setLastClip(clipIn, 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& clipCopy = stencilBuffer->getLastClip();
gpu->setClip(GrClip(bounds));
GrDrawTarget::AutoStateRestore asr(gpu, GrDrawTarget::kReset_ASRInit);
drawState = gpu->drawState();
drawState->setRenderTarget(rt);
GrDrawTarget::AutoGeometryPush agp(gpu);
gpu->disableScissor();
#if !VISUALIZE_COMPLEX_CLIP
drawState->enableState(GrDrawState::kNoColorWrites_StateBit);
#endif
int count = clipCopy.getElementCount();
int clipBit = stencilBuffer->bits();
SkASSERT((clipBit <= 16) &&
"Ganesh only handles 16b or smaller stencil buffers");
clipBit = (1 << (clipBit-1));
GrIRect rtRect = GrIRect::MakeWH(rt->width(), rt->height());
bool clearToInside;
SkRegion::Op startOp = SkRegion::kReplace_Op; // suppress warning
int start = process_initial_clip_elements(clipCopy,
rtRect,
&clearToInside,
&startOp);
gpu->clearStencilClip(scissorSettings->fScissorRect, 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(GrGpu::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.
SkRegion::Op op = (c == start) ? startOp : clipCopy.getOp(c);
GrPathRenderer* pr = NULL;
const SkPath* clipPath = NULL;
if (kRect_ClipType == clipCopy.getElementType(c)) {
canRenderDirectToStencil = true;
fill = kEvenOdd_PathFill;
fillInverted = false;
// there is no point in intersecting a screen filling
// rectangle.
if (SkRegion::kIntersect_Op == op &&
contains(clipCopy.getRect(c), rtRect)) {
continue;
}
} else {
fill = clipCopy.getPathFill(c);
fillInverted = GrIsFillInverted(fill);
fill = GrNonInvertedFill(fill);
clipPath = &clipCopy.getPath(c);
pr = this->getClipPathRenderer(gpu, *clipPath, fill, false);
if (NULL == pr) {
fClipMaskInStencil = false;
gpu->setClip(clipCopy); // restore to the original
return false;
}
canRenderDirectToStencil =
!pr->requiresStencilPass(*clipPath, fill, gpu);
}
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 == clipCopy.getElementType(c)) {
*drawState->stencil() = gDrawToStencil;
gpu->drawSimpleRect(clipCopy.getRect(c), NULL, 0);
} else {
if (canRenderDirectToStencil) {
*drawState->stencil() = gDrawToStencil;
pr->drawPath(*clipPath, fill, NULL, gpu, 0, false);
} else {
pr->drawPathToStencil(*clipPath, fill, gpu);
}
}
}
// now we modify the clip bit by rendering either the clip
// element directly or a bounding rect of the entire clip.
drawState->enableState(GrGpu::kModifyStencilClip_StateBit);
for (int p = 0; p < passes; ++p) {
*drawState->stencil() = stencilSettings[p];
if (canDrawDirectToClip) {
if (kRect_ClipType == clipCopy.getElementType(c)) {
SET_RANDOM_COLOR
gpu->drawSimpleRect(clipCopy.getRect(c), NULL, 0);
} else {
SET_RANDOM_COLOR
pr->drawPath(*clipPath, fill, NULL, gpu, 0, false);
}
} else {
SET_RANDOM_COLOR
gpu->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 GrInOrderDrawBuffer::flush() {
GrAssert(kReserved_GeometrySrcType != this->getGeomSrc().fVertexSrc);
GrAssert(kReserved_GeometrySrcType != this->getGeomSrc().fIndexSrc);
int numCmds = fCmds.count();
if (0 == numCmds) {
return false;
}
GrAssert(!fFlushing);
GrAutoTRestore<bool> flushRestore(&fFlushing);
fFlushing = true;
fVertexPool.unlock();
fIndexPool.unlock();
GrDrawTarget::AutoClipRestore acr(fDstGpu);
AutoGeometryAndStatePush agasp(fDstGpu, kPreserve_ASRInit);
GrDrawState playbackState;
GrDrawState* prevDrawState = fDstGpu->drawState();
prevDrawState->ref();
fDstGpu->setDrawState(&playbackState);
GrClipData clipData;
int currState = 0;
int currClip = 0;
int currClear = 0;
int currDraw = 0;
int currStencilPath = 0;
int currCopySurface = 0;
for (int c = 0; c < numCmds; ++c) {
switch (fCmds[c]) {
case kDraw_Cmd: {
const DrawRecord& draw = fDraws[currDraw];
fDstGpu->setVertexSourceToBuffer(draw.fVertexBuffer);
if (draw.isIndexed()) {
fDstGpu->setIndexSourceToBuffer(draw.fIndexBuffer);
}
fDstGpu->executeDraw(draw);
++currDraw;
break;
}
case kStencilPath_Cmd: {
const StencilPath& sp = fStencilPaths[currStencilPath];
fDstGpu->stencilPath(sp.fPath.get(), sp.fStroke, sp.fFill);
++currStencilPath;
break;
}
case kSetState_Cmd:
fStates[currState].restoreTo(&playbackState);
++currState;
break;
case kSetClip_Cmd:
clipData.fClipStack = &fClips[currClip];
clipData.fOrigin = fClipOrigins[currClip];
fDstGpu->setClip(&clipData);
++currClip;
break;
case kClear_Cmd:
fDstGpu->clear(&fClears[currClear].fRect,
fClears[currClear].fColor,
fClears[currClear].fRenderTarget);
++currClear;
break;
case kCopySurface_Cmd:
fDstGpu->copySurface(fCopySurfaces[currCopySurface].fDst.get(),
fCopySurfaces[currCopySurface].fSrc.get(),
fCopySurfaces[currCopySurface].fSrcRect,
fCopySurfaces[currCopySurface].fDstPoint);
++currCopySurface;
break;
}
}
// we should have consumed all the states, clips, etc.
GrAssert(fStates.count() == currState);
GrAssert(fClips.count() == currClip);
GrAssert(fClipOrigins.count() == currClip);
GrAssert(fClears.count() == currClear);
GrAssert(fDraws.count() == currDraw);
GrAssert(fCopySurfaces.count() == currCopySurface);
fDstGpu->setDrawState(prevDrawState);
prevDrawState->unref();
this->reset();
return true;
}
////////////////////////////////////////////////////////////////////////////////
// Create a 1-bit clip mask in the stencil buffer. 'devClipBounds' are in device
// (as opposed to canvas) coordinates
bool GrClipMaskManager::createStencilClipMask(InitialState initialState,
const ElementList& elements,
const SkIRect& clipSpaceIBounds,
const SkIPoint& clipSpaceToStencilOffset) {
GrAssert(kNone_ClipMaskType == fCurrClipMaskType);
GrDrawState* drawState = fGpu->drawState();
GrAssert(drawState->isClipState());
GrRenderTarget* rt = drawState->getRenderTarget();
GrAssert(NULL != rt);
// TODO: dynamically attach a SB when needed.
GrStencilBuffer* stencilBuffer = rt->getStencilBuffer();
if (NULL == stencilBuffer) {
return false;
}
int32_t genID = elements.tail()->getGenID();
if (stencilBuffer->mustRenderClip(genID, clipSpaceIBounds, clipSpaceToStencilOffset)) {
stencilBuffer->setLastClip(genID, clipSpaceIBounds, clipSpaceToStencilOffset);
GrDrawTarget::AutoGeometryAndStatePush agasp(fGpu, GrDrawTarget::kReset_ASRInit);
drawState = fGpu->drawState();
drawState->setRenderTarget(rt);
// We set the current clip to the bounds so that our recursive draws are scissored to them.
SkIRect stencilSpaceIBounds(clipSpaceIBounds);
stencilSpaceIBounds.offset(clipSpaceToStencilOffset);
GrDrawTarget::AutoClipRestore acr(fGpu, stencilSpaceIBounds);
drawState->enableState(GrDrawState::kClip_StateBit);
// Set the matrix so that rendered clip elements are transformed from clip to stencil space.
SkVector translate = {
SkIntToScalar(clipSpaceToStencilOffset.fX),
SkIntToScalar(clipSpaceToStencilOffset.fY)
};
drawState->viewMatrix()->setTranslate(translate);
#if !VISUALIZE_COMPLEX_CLIP
drawState->enableState(GrDrawState::kNoColorWrites_StateBit);
#endif
int clipBit = stencilBuffer->bits();
SkASSERT((clipBit <= 16) && "Ganesh only handles 16b or smaller stencil buffers");
clipBit = (1 << (clipBit-1));
fGpu->clearStencilClip(stencilSpaceIBounds, kAllIn_InitialState == initialState);
// walk through each clip element and perform its set op
// with the existing clip.
for (ElementList::Iter iter(elements.headIter()); NULL != iter.get(); iter.next()) {
const Element* element = iter.get();
bool fillInverted = false;
// enabled at bottom of loop
drawState->disableState(GrGpu::kModifyStencilClip_StateBit);
// if the target is MSAA then we want MSAA enabled when the clip is soft
if (rt->isMultisampled()) {
drawState->setState(GrDrawState::kHWAntialias_StateBit, element->isAA());
}
// This will be used to determine whether the clip shape can be rendered into the
// stencil with arbitrary stencil settings.
GrPathRenderer::StencilSupport stencilSupport;
SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle);
SkRegion::Op op = element->getOp();
GrPathRenderer* pr = NULL;
SkTCopyOnFirstWrite<SkPath> clipPath;
if (Element::kRect_Type == element->getType()) {
stencilSupport = GrPathRenderer::kNoRestriction_StencilSupport;
fillInverted = false;
} else {
GrAssert(Element::kPath_Type == element->getType());
clipPath.init(element->getPath());
fillInverted = clipPath->isInverseFillType();
if (fillInverted) {
clipPath.writable()->toggleInverseFillType();
}
pr = this->getContext()->getPathRenderer(*clipPath,
stroke,
fGpu,
false,
GrPathRendererChain::kStencilOnly_DrawType,
&stencilSupport);
if (NULL == pr) {
return false;
}
}
int passes;
GrStencilSettings stencilSettings[GrStencilSettings::kMaxStencilClipPasses];
bool canRenderDirectToStencil =
GrPathRenderer::kNoRestriction_StencilSupport == stencilSupport;
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 (Element::kRect_Type == element->getType()) {
*drawState->stencil() = gDrawToStencil;
fGpu->drawSimpleRect(element->getRect(), NULL);
} else {
GrAssert(Element::kPath_Type == element->getType());
if (canRenderDirectToStencil) {
*drawState->stencil() = gDrawToStencil;
pr->drawPath(*clipPath, stroke, fGpu, false);
} else {
pr->stencilPath(*clipPath, stroke, fGpu);
}
}
}
// now we modify the clip bit by rendering either the clip
// element directly or a bounding rect of the entire clip.
drawState->enableState(GrGpu::kModifyStencilClip_StateBit);
for (int p = 0; p < passes; ++p) {
*drawState->stencil() = stencilSettings[p];
if (canDrawDirectToClip) {
if (Element::kRect_Type == element->getType()) {
SET_RANDOM_COLOR
fGpu->drawSimpleRect(element->getRect(), NULL);
} else {
GrAssert(Element::kPath_Type == element->getType());
SET_RANDOM_COLOR
pr->drawPath(*clipPath, stroke, fGpu, false);
}
} else {
SET_RANDOM_COLOR
// The view matrix is setup to do clip space -> stencil space translation, so
// draw rect in clip space.
fGpu->drawSimpleRect(SkRect::MakeFromIRect(clipSpaceIBounds), NULL);
}
}
}
bool GrAAHairLinePathRenderer::onDrawPath(const SkPath& path,
const SkStrokeRec&,
GrDrawTarget* target,
bool antiAlias) {
int lineCnt;
int quadCnt;
GrDrawTarget::AutoReleaseGeometry arg;
if (!this->createGeom(path,
target,
&lineCnt,
&quadCnt,
&arg)) {
return false;
}
GrDrawState::AutoDeviceCoordDraw adcd;
GrDrawState* drawState = target->drawState();
// createGeom transforms the geometry to device space when the matrix does not have
// perspective.
if (!drawState->getViewMatrix().hasPerspective()) {
adcd.set(drawState);
if (!adcd.succeeded()) {
return false;
}
}
// TODO: See whether rendering lines as degenerate quads improves perf
// when we have a mix
GrDrawState::VertexEdgeType oldEdgeType = drawState->getVertexEdgeType();
target->setIndexSourceToBuffer(fLinesIndexBuffer);
int lines = 0;
int nBufLines = fLinesIndexBuffer->maxQuads();
drawState->setVertexEdgeType(GrDrawState::kHairLine_EdgeType);
while (lines < lineCnt) {
int n = GrMin(lineCnt - lines, nBufLines);
target->drawIndexed(kTriangles_GrPrimitiveType,
kVertsPerLineSeg*lines, // startV
0, // startI
kVertsPerLineSeg*n, // vCount
kIdxsPerLineSeg*n); // iCount
lines += n;
}
target->setIndexSourceToBuffer(fQuadsIndexBuffer);
int quads = 0;
drawState->setVertexEdgeType(GrDrawState::kHairQuad_EdgeType);
while (quads < quadCnt) {
int n = GrMin(quadCnt - quads, kNumQuadsInIdxBuffer);
target->drawIndexed(kTriangles_GrPrimitiveType,
4 * lineCnt + kVertsPerQuad*quads, // startV
0, // startI
kVertsPerQuad*n, // vCount
kIdxsPerQuad*n); // iCount
quads += n;
}
drawState->setVertexEdgeType(oldEdgeType);
return true;
}
////////////////////////////////////////////////////////////////////////////////
// sort out what kind of clip mask needs to be created: alpha, stencil,
// scissor, or entirely software
bool GrClipMaskManager::setupClipping(const GrClipData* clipDataIn) {
fCurrClipMaskType = kNone_ClipMaskType;
ElementList elements(16);
InitialState initialState;
SkIRect clipSpaceIBounds;
bool requiresAA;
bool isRect = false;
GrDrawState* drawState = fGpu->drawState();
const GrRenderTarget* rt = drawState->getRenderTarget();
// GrDrawTarget should have filtered this for us
GrAssert(NULL != rt);
bool ignoreClip = !drawState->isClipState() || clipDataIn->fClipStack->isWideOpen();
if (!ignoreClip) {
SkIRect clipSpaceRTIBounds = SkIRect::MakeWH(rt->width(), rt->height());
clipSpaceRTIBounds.offset(clipDataIn->fOrigin);
ReduceClipStack(*clipDataIn->fClipStack,
clipSpaceRTIBounds,
&elements,
&initialState,
&clipSpaceIBounds,
&requiresAA);
if (elements.isEmpty()) {
if (kAllIn_InitialState == initialState) {
ignoreClip = clipSpaceIBounds == clipSpaceRTIBounds;
isRect = true;
} else {
return false;
}
}
}
if (ignoreClip) {
fGpu->disableScissor();
this->setGpuStencil();
return true;
}
#if GR_AA_CLIP
// TODO: catch isRect && requiresAA and use clip planes if available rather than a mask.
// If MSAA is enabled we can do everything in the stencil buffer.
if (0 == rt->numSamples() && requiresAA) {
int32_t genID = clipDataIn->fClipStack->getTopmostGenID();
GrTexture* result = NULL;
if (this->useSWOnlyPath(elements)) {
// The clip geometry is complex enough that it will be more efficient to create it
// entirely in software
result = this->createSoftwareClipMask(genID,
initialState,
elements,
clipSpaceIBounds);
} else {
result = this->createAlphaClipMask(genID,
initialState,
elements,
clipSpaceIBounds);
}
if (NULL != result) {
// The mask's top left coord should be pinned to the rounded-out top left corner of
// clipSpace bounds. We determine the mask's position WRT to the render target here.
SkIRect rtSpaceMaskBounds = clipSpaceIBounds;
rtSpaceMaskBounds.offset(-clipDataIn->fOrigin);
setup_drawstate_aaclip(fGpu, result, rtSpaceMaskBounds);
fGpu->disableScissor();
this->setGpuStencil();
return true;
}
// if alpha clip mask creation fails fall through to the non-AA code paths
}
#endif // GR_AA_CLIP
// Either a hard (stencil buffer) clip was explicitly requested or an anti-aliased clip couldn't
// be created. In either case, free up the texture in the anti-aliased 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();
// If the clip is a rectangle then just set the scissor. Otherwise, create
// a stencil mask.
if (isRect) {
SkIRect clipRect = clipSpaceIBounds;
clipRect.offset(-clipDataIn->fOrigin);
fGpu->enableScissor(clipRect);
this->setGpuStencil();
return true;
}
// use the stencil clip if we can't represent the clip as a rectangle.
SkIPoint clipSpaceToStencilSpaceOffset = -clipDataIn->fOrigin;
this->createStencilClipMask(initialState,
elements,
clipSpaceIBounds,
clipSpaceToStencilSpaceOffset);
// This must occur after createStencilClipMask. That function may change the scissor. Also, it
// only guarantees that the stencil mask is correct within the bounds it was passed, so we must
// use both stencil and scissor test to the bounds for the final draw.
SkIRect scissorSpaceIBounds(clipSpaceIBounds);
scissorSpaceIBounds.offset(clipSpaceToStencilSpaceOffset);
fGpu->enableScissor(scissorSpaceIBounds);
this->setGpuStencil();
return true;
}
////////////////////////////////////////////////////////////////////////////////
// sort out what kind of clip mask needs to be created: alpha, stencil,
// scissor, or entirely software
bool GrClipMaskManager::setupClipping(const GrClipData* clipDataIn,
GrDrawState::AutoRestoreEffects* are,
const SkRect* devBounds) {
fCurrClipMaskType = kNone_ClipMaskType;
ElementList elements(16);
int32_t genID;
InitialState initialState;
SkIRect clipSpaceIBounds;
bool requiresAA;
GrDrawState* drawState = fGpu->drawState();
const GrRenderTarget* rt = drawState->getRenderTarget();
// GrDrawTarget should have filtered this for us
SkASSERT(NULL != rt);
bool ignoreClip = !drawState->isClipState() || clipDataIn->fClipStack->isWideOpen();
if (!ignoreClip) {
SkIRect clipSpaceRTIBounds = SkIRect::MakeWH(rt->width(), rt->height());
clipSpaceRTIBounds.offset(clipDataIn->fOrigin);
ReduceClipStack(*clipDataIn->fClipStack,
clipSpaceRTIBounds,
&elements,
&genID,
&initialState,
&clipSpaceIBounds,
&requiresAA);
if (elements.isEmpty()) {
if (kAllIn_InitialState == initialState) {
ignoreClip = clipSpaceIBounds == clipSpaceRTIBounds;
} else {
return false;
}
}
}
if (ignoreClip) {
fGpu->disableScissor();
this->setGpuStencil();
return true;
}
// An element count of 4 was chosen because of the common pattern in Blink of:
// isect RR
// diff RR
// isect convex_poly
// isect convex_poly
// when drawing rounded div borders. This could probably be tuned based on a
// configuration's relative costs of switching RTs to generate a mask vs
// longer shaders.
if (elements.count() <= 4) {
SkVector clipToRTOffset = { SkIntToScalar(-clipDataIn->fOrigin.fX),
SkIntToScalar(-clipDataIn->fOrigin.fY) };
if (elements.isEmpty() ||
(requiresAA && this->installClipEffects(elements, are, clipToRTOffset, devBounds))) {
SkIRect scissorSpaceIBounds(clipSpaceIBounds);
scissorSpaceIBounds.offset(-clipDataIn->fOrigin);
if (NULL == devBounds ||
!SkRect::Make(scissorSpaceIBounds).contains(*devBounds)) {
fGpu->enableScissor(scissorSpaceIBounds);
} else {
fGpu->disableScissor();
}
this->setGpuStencil();
return true;
}
}
#if GR_AA_CLIP
// If MSAA is enabled we can do everything in the stencil buffer.
if (0 == rt->numSamples() && requiresAA) {
GrTexture* result = NULL;
if (this->useSWOnlyPath(elements)) {
// The clip geometry is complex enough that it will be more efficient to create it
// entirely in software
result = this->createSoftwareClipMask(genID,
initialState,
elements,
clipSpaceIBounds);
} else {
result = this->createAlphaClipMask(genID,
initialState,
elements,
clipSpaceIBounds);
}
if (NULL != result) {
// The mask's top left coord should be pinned to the rounded-out top left corner of
// clipSpace bounds. We determine the mask's position WRT to the render target here.
SkIRect rtSpaceMaskBounds = clipSpaceIBounds;
rtSpaceMaskBounds.offset(-clipDataIn->fOrigin);
are->set(fGpu->drawState());
setup_drawstate_aaclip(fGpu, result, rtSpaceMaskBounds);
fGpu->disableScissor();
this->setGpuStencil();
return true;
}
// if alpha clip mask creation fails fall through to the non-AA code paths
}
#endif // GR_AA_CLIP
// Either a hard (stencil buffer) clip was explicitly requested or an anti-aliased clip couldn't
// be created. In either case, free up the texture in the anti-aliased 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();
// use the stencil clip if we can't represent the clip as a rectangle.
SkIPoint clipSpaceToStencilSpaceOffset = -clipDataIn->fOrigin;
this->createStencilClipMask(genID,
initialState,
elements,
clipSpaceIBounds,
clipSpaceToStencilSpaceOffset);
// This must occur after createStencilClipMask. That function may change the scissor. Also, it
// only guarantees that the stencil mask is correct within the bounds it was passed, so we must
// use both stencil and scissor test to the bounds for the final draw.
SkIRect scissorSpaceIBounds(clipSpaceIBounds);
scissorSpaceIBounds.offset(clipSpaceToStencilSpaceOffset);
fGpu->enableScissor(scissorSpaceIBounds);
this->setGpuStencil();
return true;
}
////////////////////////////////////////////////////////////////////////////////
// Create a 8-bit clip mask in alpha
GrTexture* GrClipMaskManager::createAlphaClipMask(int32_t clipStackGenID,
InitialState initialState,
const ElementList& elements,
const SkIRect& clipSpaceIBounds) {
GrAssert(kNone_ClipMaskType == fCurrClipMaskType);
GrTexture* result;
if (this->getMaskTexture(clipStackGenID, clipSpaceIBounds, &result)) {
fCurrClipMaskType = kAlpha_ClipMaskType;
return result;
}
if (NULL == result) {
fAACache.reset();
return NULL;
}
GrDrawTarget::AutoGeometryAndStatePush agasp(fGpu, GrDrawTarget::kReset_ASRInit);
GrDrawState* drawState = fGpu->drawState();
// The top-left of the mask corresponds to the top-left corner of the bounds.
SkVector clipToMaskOffset = {
SkIntToScalar(-clipSpaceIBounds.fLeft),
SkIntToScalar(-clipSpaceIBounds.fTop)
};
// The texture may be larger than necessary, this rect represents the part of the texture
// we populate with a rasterization of the clip.
SkIRect maskSpaceIBounds = SkIRect::MakeWH(clipSpaceIBounds.width(), clipSpaceIBounds.height());
// We're drawing a coverage mask and want coverage to be run through the blend function.
drawState->enableState(GrDrawState::kCoverageDrawing_StateBit);
// Set the matrix so that rendered clip elements are transformed to mask space from clip space.
drawState->viewMatrix()->setTranslate(clipToMaskOffset);
// The scratch texture that we are drawing into can be substantially larger than the mask. Only
// clear the part that we care about.
fGpu->clear(&maskSpaceIBounds,
kAllIn_InitialState == initialState ? 0xffffffff : 0x00000000,
result->asRenderTarget());
// When we use the stencil in the below loop it is important to have this clip installed.
// The second pass that zeros the stencil buffer renders the rect maskSpaceIBounds so the first
// pass must not set values outside of this bounds or stencil values outside the rect won't be
// cleared.
GrDrawTarget::AutoClipRestore acr(fGpu, maskSpaceIBounds);
drawState->enableState(GrDrawState::kClip_StateBit);
GrAutoScratchTexture temp;
// walk through each clip element and perform its set op
for (ElementList::Iter iter = elements.headIter(); iter.get(); iter.next()) {
const Element* element = iter.get();
SkRegion::Op op = element->getOp();
bool invert = element->isInverseFilled();
if (invert || SkRegion::kIntersect_Op == op || SkRegion::kReverseDifference_Op == op) {
GrPathRenderer* pr = NULL;
bool useTemp = !this->canStencilAndDrawElement(result, element, &pr);
GrTexture* dst;
// This is the bounds of the clip element in the space of the alpha-mask. The temporary
// mask buffer can be substantially larger than the actually clip stack element. We
// touch the minimum number of pixels necessary and use decal mode to combine it with
// the accumulator.
GrIRect maskSpaceElementIBounds;
if (useTemp) {
if (invert) {
maskSpaceElementIBounds = maskSpaceIBounds;
} else {
GrRect elementBounds = element->getBounds();
elementBounds.offset(clipToMaskOffset);
elementBounds.roundOut(&maskSpaceElementIBounds);
}
this->getTemp(maskSpaceIBounds.fRight, maskSpaceIBounds.fBottom, &temp);
if (NULL == temp.texture()) {
fAACache.reset();
return NULL;
}
dst = temp.texture();
// clear the temp target and set blend to replace
fGpu->clear(&maskSpaceElementIBounds,
invert ? 0xffffffff : 0x00000000,
dst->asRenderTarget());
setup_boolean_blendcoeffs(drawState, SkRegion::kReplace_Op);
} else {
// draw directly into the result with the stencil set to make the pixels affected
// by the clip shape be non-zero.
dst = result;
GR_STATIC_CONST_SAME_STENCIL(kStencilInElement,
kReplace_StencilOp,
kReplace_StencilOp,
kAlways_StencilFunc,
0xffff,
0xffff,
0xffff);
drawState->setStencil(kStencilInElement);
setup_boolean_blendcoeffs(drawState, op);
}
drawState->setAlpha(invert ? 0x00 : 0xff);
if (!this->drawElement(dst, element, pr)) {
fAACache.reset();
return NULL;
}
if (useTemp) {
// Now draw into the accumulator using the real operation and the temp buffer as a
// texture
this->mergeMask(result,
temp.texture(),
op,
maskSpaceIBounds,
maskSpaceElementIBounds);
} else {
// Draw to the exterior pixels (those with a zero stencil value).
drawState->setAlpha(invert ? 0xff : 0x00);
GR_STATIC_CONST_SAME_STENCIL(kDrawOutsideElement,
kZero_StencilOp,
kZero_StencilOp,
kEqual_StencilFunc,
0xffff,
0x0000,
0xffff);
drawState->setStencil(kDrawOutsideElement);
fGpu->drawSimpleRect(clipSpaceIBounds);
drawState->disableStencil();
}
} else {
// all the remaining ops can just be directly draw into the accumulation buffer
drawState->setAlpha(0xff);
setup_boolean_blendcoeffs(drawState, op);
this->drawElement(result, element);
}
}
fCurrClipMaskType = kAlpha_ClipMaskType;
return result;
}
void GrGLProgramDesc::Build(const GrDrawState& drawState,
bool isPoints,
GrDrawState::BlendOptFlags blendOpts,
GrBlendCoeff srcCoeff,
GrBlendCoeff dstCoeff,
const GrGpuGL* gpu,
const GrDeviceCoordTexture* dstCopy,
SkTArray<const GrEffectStage*, true>* colorStages,
SkTArray<const GrEffectStage*, true>* coverageStages,
GrGLProgramDesc* desc) {
colorStages->reset();
coverageStages->reset();
// This should already have been caught
SkASSERT(!(GrDrawState::kSkipDraw_BlendOptFlag & blendOpts));
bool skipCoverage = SkToBool(blendOpts & GrDrawState::kEmitTransBlack_BlendOptFlag);
bool skipColor = SkToBool(blendOpts & (GrDrawState::kEmitTransBlack_BlendOptFlag |
GrDrawState::kEmitCoverage_BlendOptFlag));
int firstEffectiveColorStage = 0;
bool inputColorIsUsed = true;
if (!skipColor) {
firstEffectiveColorStage = drawState.numColorStages();
while (firstEffectiveColorStage > 0 && inputColorIsUsed) {
--firstEffectiveColorStage;
const GrEffect* effect = drawState.getColorStage(firstEffectiveColorStage).getEffect()->get();
inputColorIsUsed = effect->willUseInputColor();
}
}
int firstEffectiveCoverageStage = 0;
bool inputCoverageIsUsed = true;
if (!skipCoverage) {
firstEffectiveCoverageStage = drawState.numCoverageStages();
while (firstEffectiveCoverageStage > 0 && inputCoverageIsUsed) {
--firstEffectiveCoverageStage;
const GrEffect* effect = drawState.getCoverageStage(firstEffectiveCoverageStage).getEffect()->get();
inputCoverageIsUsed = effect->willUseInputColor();
}
}
// The descriptor is used as a cache key. Thus when a field of the
// descriptor will not affect program generation (because of the attribute
// bindings in use or other descriptor field settings) it should be set
// to a canonical value to avoid duplicate programs with different keys.
bool requiresColorAttrib = !skipColor && drawState.hasColorVertexAttribute();
bool requiresCoverageAttrib = !skipCoverage && drawState.hasCoverageVertexAttribute();
// we only need the local coords if we're actually going to generate effect code
bool requiresLocalCoordAttrib = !(skipCoverage && skipColor) &&
drawState.hasLocalCoordAttribute();
bool colorIsTransBlack = SkToBool(blendOpts & GrDrawState::kEmitTransBlack_BlendOptFlag);
bool colorIsSolidWhite = (blendOpts & GrDrawState::kEmitCoverage_BlendOptFlag) ||
(!requiresColorAttrib && 0xffffffff == drawState.getColor()) ||
(!inputColorIsUsed);
int numEffects = (skipColor ? 0 : (drawState.numColorStages() - firstEffectiveColorStage)) +
(skipCoverage ? 0 : (drawState.numCoverageStages() - firstEffectiveCoverageStage));
size_t newKeyLength = KeyLength(numEffects);
bool allocChanged;
desc->fKey.reset(newKeyLength, SkAutoMalloc::kAlloc_OnShrink, &allocChanged);
if (allocChanged || !desc->fInitialized) {
// make sure any padding in the header is zero if we we haven't used this allocation before.
memset(desc->header(), 0, kHeaderSize);
}
// write the key length
*desc->atOffset<uint32_t, kLengthOffset>() = SkToU32(newKeyLength);
KeyHeader* header = desc->header();
EffectKey* effectKeys = desc->effectKeys();
int currEffectKey = 0;
bool readsDst = false;
bool readFragPosition = false;
bool hasVertexCode = false;
if (!skipColor) {
for (int s = firstEffectiveColorStage; s < drawState.numColorStages(); ++s) {
effectKeys[currEffectKey++] =
get_key_and_update_stats(drawState.getColorStage(s), gpu->glCaps(),
requiresLocalCoordAttrib, &readsDst, &readFragPosition,
&hasVertexCode);
}
}
if (!skipCoverage) {
for (int s = firstEffectiveCoverageStage; s < drawState.numCoverageStages(); ++s) {
effectKeys[currEffectKey++] =
get_key_and_update_stats(drawState.getCoverageStage(s), gpu->glCaps(),
requiresLocalCoordAttrib, &readsDst, &readFragPosition,
&hasVertexCode);
}
}
header->fHasVertexCode = hasVertexCode || requiresLocalCoordAttrib;
header->fEmitsPointSize = isPoints;
// Currently the experimental GS will only work with triangle prims (and it doesn't do anything
// other than pass through values from the VS to the FS anyway).
#if GR_GL_EXPERIMENTAL_GS
#if 0
header->fExperimentalGS = gpu->caps().geometryShaderSupport();
#else
header->fExperimentalGS = false;
#endif
#endif
bool defaultToUniformInputs = GR_GL_NO_CONSTANT_ATTRIBUTES || gpu->caps()->pathRenderingSupport();
if (colorIsTransBlack) {
header->fColorInput = kTransBlack_ColorInput;
} else if (colorIsSolidWhite) {
header->fColorInput = kSolidWhite_ColorInput;
} else if (defaultToUniformInputs && !requiresColorAttrib) {
header->fColorInput = kUniform_ColorInput;
} else {
header->fColorInput = kAttribute_ColorInput;
header->fHasVertexCode = true;
}
bool covIsSolidWhite = !requiresCoverageAttrib && 0xffffffff == drawState.getCoverageColor();
if (skipCoverage) {
header->fCoverageInput = kTransBlack_ColorInput;
} else if (covIsSolidWhite || !inputCoverageIsUsed) {
header->fCoverageInput = kSolidWhite_ColorInput;
} else if (defaultToUniformInputs && !requiresCoverageAttrib) {
header->fCoverageInput = kUniform_ColorInput;
} else {
header->fCoverageInput = kAttribute_ColorInput;
header->fHasVertexCode = true;
}
if (readsDst) {
SkASSERT(NULL != dstCopy || gpu->caps()->dstReadInShaderSupport());
const GrTexture* dstCopyTexture = NULL;
if (NULL != dstCopy) {
dstCopyTexture = dstCopy->texture();
}
header->fDstReadKey = GrGLShaderBuilder::KeyForDstRead(dstCopyTexture, gpu->glCaps());
SkASSERT(0 != header->fDstReadKey);
} else {
header->fDstReadKey = 0;
}
if (readFragPosition) {
header->fFragPosKey = GrGLShaderBuilder::KeyForFragmentPosition(drawState.getRenderTarget(),
gpu->glCaps());
} else {
header->fFragPosKey = 0;
}
// Record attribute indices
header->fPositionAttributeIndex = drawState.positionAttributeIndex();
header->fLocalCoordAttributeIndex = drawState.localCoordAttributeIndex();
// For constant color and coverage we need an attribute with an index beyond those already set
int availableAttributeIndex = drawState.getVertexAttribCount();
if (requiresColorAttrib) {
header->fColorAttributeIndex = drawState.colorVertexAttributeIndex();
} else if (GrGLProgramDesc::kAttribute_ColorInput == header->fColorInput) {
SkASSERT(availableAttributeIndex < GrDrawState::kMaxVertexAttribCnt);
header->fColorAttributeIndex = availableAttributeIndex;
availableAttributeIndex++;
} else {
header->fColorAttributeIndex = -1;
}
if (requiresCoverageAttrib) {
header->fCoverageAttributeIndex = drawState.coverageVertexAttributeIndex();
} else if (GrGLProgramDesc::kAttribute_ColorInput == header->fCoverageInput) {
SkASSERT(availableAttributeIndex < GrDrawState::kMaxVertexAttribCnt);
header->fCoverageAttributeIndex = availableAttributeIndex;
} else {
header->fCoverageAttributeIndex = -1;
}
// Here we deal with whether/how we handle color and coverage separately.
// Set this default and then possibly change our mind if there is coverage.
header->fCoverageOutput = kModulate_CoverageOutput;
// If we do have coverage determine whether it matters.
bool separateCoverageFromColor = false;
if (!drawState.isCoverageDrawing() && !skipCoverage &&
(drawState.numCoverageStages() > 0 || requiresCoverageAttrib)) {
if (gpu->caps()->dualSourceBlendingSupport() &&
!(blendOpts & (GrDrawState::kEmitCoverage_BlendOptFlag |
GrDrawState::kCoverageAsAlpha_BlendOptFlag))) {
if (kZero_GrBlendCoeff == dstCoeff) {
// write the coverage value to second color
header->fCoverageOutput = kSecondaryCoverage_CoverageOutput;
separateCoverageFromColor = true;
} else if (kSA_GrBlendCoeff == dstCoeff) {
// SA dst coeff becomes 1-(1-SA)*coverage when dst is partially covered.
header->fCoverageOutput = kSecondaryCoverageISA_CoverageOutput;
separateCoverageFromColor = true;
} else if (kSC_GrBlendCoeff == dstCoeff) {
// SA dst coeff becomes 1-(1-SA)*coverage when dst is partially covered.
header->fCoverageOutput = kSecondaryCoverageISC_CoverageOutput;
separateCoverageFromColor = true;
}
} else if (readsDst &&
kOne_GrBlendCoeff == srcCoeff &&
kZero_GrBlendCoeff == dstCoeff) {
header->fCoverageOutput = kCombineWithDst_CoverageOutput;
separateCoverageFromColor = true;
}
}
if (!skipColor) {
for (int s = firstEffectiveColorStage; s < drawState.numColorStages(); ++s) {
colorStages->push_back(&drawState.getColorStage(s));
}
}
if (!skipCoverage) {
SkTArray<const GrEffectStage*, true>* array;
if (separateCoverageFromColor) {
array = coverageStages;
} else {
array = colorStages;
}
for (int s = firstEffectiveCoverageStage; s < drawState.numCoverageStages(); ++s) {
array->push_back(&drawState.getCoverageStage(s));
}
}
header->fColorEffectCnt = colorStages->count();
header->fCoverageEffectCnt = coverageStages->count();
*desc->checksum() = 0;
*desc->checksum() = SkChecksum::Compute(reinterpret_cast<uint32_t*>(desc->fKey.get()),
newKeyLength);
desc->fInitialized = 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);
}
}
}
////////////////////////////////////////////////////////////////////////////////
// Create a 8-bit clip mask in alpha
bool GrClipMaskManager::createAlphaClipMask(GrGpu* gpu,
const GrClip& clipIn,
GrTexture** result,
GrIRect *resultBounds) {
if (this->clipMaskPreamble(gpu, clipIn, result, resultBounds)) {
return true;
}
GrTexture* accum = fAACache.getLastMask();
if (NULL == accum) {
fClipMaskInAlpha = false;
fAACache.reset();
return false;
}
GrDrawTarget::AutoStateRestore asr(gpu, GrDrawTarget::kReset_ASRInit);
GrDrawState* drawState = gpu->drawState();
GrDrawTarget::AutoGeometryPush agp(gpu);
int count = clipIn.getElementCount();
if (0 != resultBounds->fTop || 0 != resultBounds->fLeft) {
// if we were able to trim down the size of the mask we need to
// offset the paths & rects that will be used to compute it
GrMatrix m;
m.setTranslate(SkIntToScalar(-resultBounds->fLeft),
SkIntToScalar(-resultBounds->fTop));
drawState->setViewMatrix(m);
}
bool clearToInside;
SkRegion::Op startOp = SkRegion::kReplace_Op; // suppress warning
int start = process_initial_clip_elements(clipIn,
*resultBounds,
&clearToInside,
&startOp);
clear(gpu, accum, clearToInside ? 0xffffffff : 0x00000000);
GrAutoScratchTexture temp;
// walk through each clip element and perform its set op
for (int c = start; c < count; ++c) {
SkRegion::Op op = (c == start) ? startOp : clipIn.getOp(c);
if (SkRegion::kReplace_Op == op) {
// TODO: replace is actually a lot faster then intersection
// for this path - refactor the stencil path so it can handle
// replace ops and alter GrClip to allow them through
// clear the accumulator and draw the new object directly into it
clear(gpu, accum, 0x00000000);
setup_boolean_blendcoeffs(drawState, op);
this->drawClipShape(gpu, accum, clipIn, c);
} else if (SkRegion::kReverseDifference_Op == op ||
SkRegion::kIntersect_Op == op) {
// there is no point in intersecting a screen filling rectangle.
if (SkRegion::kIntersect_Op == op &&
kRect_ClipType == clipIn.getElementType(c) &&
contains(clipIn.getRect(c), *resultBounds)) {
continue;
}
getTemp(*resultBounds, &temp);
if (NULL == temp.texture()) {
fClipMaskInAlpha = false;
fAACache.reset();
return false;
}
// clear the temp target & draw into it
clear(gpu, temp.texture(), 0x00000000);
setup_boolean_blendcoeffs(drawState, SkRegion::kReplace_Op);
this->drawClipShape(gpu, temp.texture(), clipIn, c);
// TODO: rather than adding these two translations here
// compute the bounding box needed to render the texture
// into temp
if (0 != resultBounds->fTop || 0 != resultBounds->fLeft) {
GrMatrix m;
m.setTranslate(SkIntToScalar(resultBounds->fLeft),
SkIntToScalar(resultBounds->fTop));
drawState->preConcatViewMatrix(m);
}
// Now draw into the accumulator using the real operation
// and the temp buffer as a texture
setup_boolean_blendcoeffs(drawState, op);
this->drawTexture(gpu, accum, temp.texture());
if (0 != resultBounds->fTop || 0 != resultBounds->fLeft) {
GrMatrix m;
m.setTranslate(SkIntToScalar(-resultBounds->fLeft),
SkIntToScalar(-resultBounds->fTop));
drawState->preConcatViewMatrix(m);
}
} else {
// all the remaining ops can just be directly draw into
// the accumulation buffer
setup_boolean_blendcoeffs(drawState, op);
this->drawClipShape(gpu, accum, clipIn, c);
}
}
*result = accum;
return true;
}
