Пример #1
0
GrTextContext::GrTextContext(GrContext* context, const GrPaint& paint) : fPaint(paint) {
    fContext = context;
    fStrike = NULL;

    fCurrTexture = NULL;
    fCurrVertex = 0;

    const GrClipData* clipData = context->getClip();

    GrRect devConservativeBound;
    clipData->fClipStack->getConservativeBounds(
        -clipData->fOrigin.fX,
        -clipData->fOrigin.fY,
        context->getRenderTarget()->width(),
        context->getRenderTarget()->height(),
        &devConservativeBound);

    devConservativeBound.roundOut(&fClipRect);

    fAutoMatrix.setIdentity(fContext, &fPaint);

    fDrawTarget = NULL;

    fVertices = NULL;
    fMaxVertices = 0;

    fVertexLayout =
        GrDrawTarget::kTextFormat_VertexLayoutBit |
        GrDrawTarget::StageTexCoordVertexLayoutBit(kGlyphMaskStage, 0);
}
Пример #2
0
/**
 * getConservativeBounds returns the conservative bounding box of the clip
 * in device (as opposed to canvas) coordinates. If the bounding box is
 * the result of purely intersections of rects (with an initial replace)
 * isIntersectionOfRects will be set to true.
 */
void GrClipData::getConservativeBounds(const GrSurface* surface,
                                       GrIRect* devResult,
                                       bool* isIntersectionOfRects) const {
    GrRect devBounds;

    fClipStack->getConservativeBounds(-fOrigin.fX,
                                      -fOrigin.fY,
                                      surface->width(),
                                      surface->height(),
                                      &devBounds,
                                      isIntersectionOfRects);

    devBounds.roundOut(devResult);
}
Пример #3
0
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;
    }
}
Пример #4
0
////////////////////////////////////////////////////////////////////////////////
// Shared preamble between gpu and SW-only AA clip mask creation paths.
// Handles caching, determination of clip mask bound & allocation (if needed)
// of the result texture
// Returns true if there is no more work to be done (i.e., we got a cache hit)
bool GrClipMaskManager::clipMaskPreamble(GrGpu* gpu,
                                         const GrClip& clipIn,
                                         GrTexture** result,
                                         GrIRect *resultBounds) {
    GrDrawState* origDrawState = gpu->drawState();
    GrAssert(origDrawState->isClipState());

    GrRenderTarget* rt = origDrawState->getRenderTarget();
    GrAssert(NULL != rt);

    GrRect rtRect;
    rtRect.setLTRB(0, 0,
                    GrIntToScalar(rt->width()), GrIntToScalar(rt->height()));

    // unlike the stencil path the alpha path is not bound to the size of the
    // render target - determine the minimum size required for the mask
    GrRect bounds;

    if (clipIn.hasConservativeBounds()) {
        bounds = clipIn.getConservativeBounds();
        if (!bounds.intersect(rtRect)) {
            // the mask will be empty in this case
            GrAssert(false);
            bounds.setEmpty();
        }
    } else {
        // still locked to the size of the render target
        bounds = rtRect;
    }

    GrIRect intBounds;
    bounds.roundOut(&intBounds);

    // need to outset a pixel since the standard bounding box computation
    // path doesn't leave any room for antialiasing (esp. w.r.t. rects)
    intBounds.outset(1, 1);

    // TODO: make sure we don't outset if bounds are still 0,0 @ min

    if (fAACache.canReuse(clipIn, 
                          intBounds.width(),
                          intBounds.height())) {
        *result = fAACache.getLastMask();
        fAACache.getLastBound(resultBounds);
        return true;
    }

    this->setupCache(clipIn, intBounds);

    *resultBounds = intBounds;
    return false;
}
Пример #5
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 GrAAHairLinePathRenderer::createGeom(GrDrawTarget::StageBitfield stages) {

    int rtHeight = fTarget->getRenderTarget()->height();

    GrIRect clip;
    if (fTarget->getClip().hasConservativeBounds()) {
        GrRect clipRect =  fTarget->getClip().getConservativeBounds();
        clipRect.roundOut(&clip);
    } else {
        clip.setLargest();
    }

    // If none of the inputs that affect generation of path geometry have
    // have changed since last previous path draw then we can reuse the
    // previous geoemtry.
    if (stages == fPreviousStages &&
        fPreviousViewMatrix == fTarget->getViewMatrix() &&
        fPreviousTranslate == fTranslate &&
        rtHeight == fPreviousRTHeight &&
        fClipRect == clip) {
        return true;
    }

    GrVertexLayout layout = GrDrawTarget::kEdge_VertexLayoutBit;
    for (int s = 0; s < GrDrawState::kNumStages; ++s) {
        if ((1 << s) & stages) {
            layout |= GrDrawTarget::StagePosAsTexCoordVertexLayoutBit(s);
        }
    }

    GrMatrix viewM = fTarget->getViewMatrix();

    PREALLOC_PTARRAY(128) lines;
    PREALLOC_PTARRAY(128) quads;
    IntArray qSubdivs;
    fQuadCnt = generate_lines_and_quads(*fPath, viewM, fTranslate, clip,
                                        &lines, &quads, &qSubdivs);

    fLineSegmentCnt = lines.count() / 2;
    int vertCnt = kVertsPerLineSeg * fLineSegmentCnt + kVertsPerQuad * fQuadCnt;

    GrAssert(sizeof(Vertex) == GrDrawTarget::VertexSize(layout));

    Vertex* verts;
    if (!fTarget->reserveVertexSpace(layout, vertCnt, (void**)&verts)) {
        return false;
    }
    Vertex* base = verts;

    const GrMatrix* toDevice = NULL;
    const GrMatrix* toSrc = NULL;
    GrMatrix ivm;

    if (viewM.hasPerspective()) {
        if (viewM.invert(&ivm)) {
            toDevice = &viewM;
            toSrc = &ivm;
        }
    }

    for (int i = 0; i < fLineSegmentCnt; ++i) {
        add_line(&lines[2*i], rtHeight, toSrc, &verts);
    }

    int unsubdivQuadCnt = quads.count() / 3;
    for (int i = 0; i < unsubdivQuadCnt; ++i) {
        GrAssert(qSubdivs[i] >= 0);
        add_quads(&quads[3*i], qSubdivs[i], toDevice, toSrc, &verts);
    }

    fPreviousStages = stages;
    fPreviousViewMatrix = fTarget->getViewMatrix();
    fPreviousRTHeight = rtHeight;
    fClipRect = clip;
    fPreviousTranslate = fTranslate;
    return true;
}
Пример #7
0
bool GrAAHairLinePathRenderer::createGeom(
            const SkPath& path,
            const GrVec* translate,
            GrDrawTarget* target,
            GrDrawState::StageMask stageMask,
            int* lineCnt,
            int* quadCnt,
            GrDrawTarget::AutoReleaseGeometry* arg) {
    const GrDrawState& drawState = target->getDrawState();
    int rtHeight = drawState.getRenderTarget()->height();

    GrIRect clip;
    if (target->getClip().hasConservativeBounds()) {
        GrRect clipRect =  target->getClip().getConservativeBounds();
        clipRect.roundOut(&clip);
    } else {
        clip.setLargest();
    }


    GrVertexLayout layout = GrDrawTarget::kEdge_VertexLayoutBit;
    GrMatrix viewM = drawState.getViewMatrix();

    PREALLOC_PTARRAY(128) lines;
    PREALLOC_PTARRAY(128) quads;
    IntArray qSubdivs;
    static const GrVec gZeroVec = {0, 0};
    if (NULL == translate) {
        translate = &gZeroVec;
    }
    *quadCnt = generate_lines_and_quads(path, viewM, *translate, clip,
                                        &lines, &quads, &qSubdivs);

    *lineCnt = lines.count() / 2;
    int vertCnt = kVertsPerLineSeg * *lineCnt + kVertsPerQuad * *quadCnt;

    GrAssert(sizeof(Vertex) == GrDrawTarget::VertexSize(layout));

    if (!arg->set(target, layout, vertCnt, 0)) {
        return false;
    }

    Vertex* verts = reinterpret_cast<Vertex*>(arg->vertices());

    const GrMatrix* toDevice = NULL;
    const GrMatrix* toSrc = NULL;
    GrMatrix ivm;

    if (viewM.hasPerspective()) {
        if (viewM.invert(&ivm)) {
            toDevice = &viewM;
            toSrc = &ivm;
        }
    }

    for (int i = 0; i < *lineCnt; ++i) {
        add_line(&lines[2*i], rtHeight, toSrc, &verts);
    }

    int unsubdivQuadCnt = quads.count() / 3;
    for (int i = 0; i < unsubdivQuadCnt; ++i) {
        GrAssert(qSubdivs[i] >= 0);
        add_quads(&quads[3*i], qSubdivs[i], toDevice, toSrc, &verts);
    }

    return true;
}
Пример #8
0
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);
                    }
                }
            }
Пример #9
0
////////////////////////////////////////////////////////////////////////////////
// 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);
                }
            }
        }
Пример #10
0
void GrDefaultPathRenderer::onDrawPath(GrDrawTarget* target,
                                       GrDrawTarget::StageBitfield stages,
                                       const GrPath& path,
                                       GrPathFill fill,
                                       const GrPoint* translate,
                                       bool stencilOnly) {

    GrDrawTarget::AutoStateRestore asr(target);
    bool colorWritesWereDisabled = target->isColorWriteDisabled();
    // face culling doesn't make sense here
    GrAssert(GrDrawTarget::kBoth_DrawFace == target->getDrawFace());

    GrMatrix viewM = target->getViewMatrix();
    // In order to tesselate the path we get a bound on how much the matrix can
    // stretch when mapping to screen coordinates.
    GrScalar stretch = viewM.getMaxStretch();
    bool useStretch = stretch > 0;
    GrScalar tol = fCurveTolerance;

    if (!useStretch) {
        // TODO: deal with perspective in some better way.
        tol /= 10;
    } else {
        tol = GrScalarDiv(tol, stretch);
    }
    GrScalar tolSqd = GrMul(tol, tol);

    int subpathCnt;
    int maxPts = GrPathUtils::worstCasePointCount(path, &subpathCnt, tol);

    GrVertexLayout layout = 0;
    for (int s = 0; s < GrDrawTarget::kNumStages; ++s) {
        if ((1 << s) & stages) {
            layout |= GrDrawTarget::StagePosAsTexCoordVertexLayoutBit(s);
        }
    }

    // add 4 to hold the bounding rect
    GrDrawTarget::AutoReleaseGeometry arg(target, layout, maxPts + 4, 0);

    GrPoint* base = (GrPoint*) arg.vertices();
    GrPoint* vert = base;
    GrPoint* subpathBase = base;

    GrAutoSTMalloc<8, uint16_t> subpathVertCount(subpathCnt);

    // TODO: use primitve restart if available rather than multiple draws
    GrPrimitiveType             type;
    int                         passCount = 0;
    const GrStencilSettings*    passes[3];
    GrDrawTarget::DrawFace      drawFace[3];
    bool                        reverse = false;
    bool                        lastPassIsBounds;

    if (kHairLine_PathFill == fill) {
        type = kLineStrip_PrimitiveType;
        passCount = 1;
        if (stencilOnly) {
            passes[0] = &gDirectToStencil;
        } else {
            passes[0] = NULL;
        }
        lastPassIsBounds = false;
        drawFace[0] = GrDrawTarget::kBoth_DrawFace;
    } else {
        type = kTriangleFan_PrimitiveType;
        if (single_pass_path(*target, path, fill)) {
            passCount = 1;
            if (stencilOnly) {
                passes[0] = &gDirectToStencil;
            } else {
                passes[0] = NULL;
            }
            drawFace[0] = GrDrawTarget::kBoth_DrawFace;
            lastPassIsBounds = false;
        } else {
            switch (fill) {
                case kInverseEvenOdd_PathFill:
                    reverse = true;
                    // fallthrough
                case kEvenOdd_PathFill:
                    passes[0] = &gEOStencilPass;
                    if (stencilOnly) {
                        passCount = 1;
                        lastPassIsBounds = false;
                    } else {
                        passCount = 2;
                        lastPassIsBounds = true;
                        if (reverse) {
                            passes[1] = &gInvEOColorPass;
                        } else {
                            passes[1] = &gEOColorPass;
                        }
                    }
                    drawFace[0] = drawFace[1] = GrDrawTarget::kBoth_DrawFace;
                    break;

                case kInverseWinding_PathFill:
                    reverse = true;
                    // fallthrough
                case kWinding_PathFill:
                    if (fSeparateStencil) {
                        if (fStencilWrapOps) {
                            passes[0] = &gWindStencilSeparateWithWrap;
                        } else {
                            passes[0] = &gWindStencilSeparateNoWrap;
                        }
                        passCount = 2;
                        drawFace[0] = GrDrawTarget::kBoth_DrawFace;
                    } else {
                        if (fStencilWrapOps) {
                            passes[0] = &gWindSingleStencilWithWrapInc;
                            passes[1] = &gWindSingleStencilWithWrapDec;
                        } else {
                            passes[0] = &gWindSingleStencilNoWrapInc;
                            passes[1] = &gWindSingleStencilNoWrapDec;
                        }
                        // which is cw and which is ccw is arbitrary.
                        drawFace[0] = GrDrawTarget::kCW_DrawFace;
                        drawFace[1] = GrDrawTarget::kCCW_DrawFace;
                        passCount = 3;
                    }
                    if (stencilOnly) {
                        lastPassIsBounds = false;
                        --passCount;
                    } else {
                        lastPassIsBounds = true;
                        drawFace[passCount-1] = GrDrawTarget::kBoth_DrawFace;
                        if (reverse) {
                            passes[passCount-1] = &gInvWindColorPass;
                        } else {
                            passes[passCount-1] = &gWindColorPass;
                        }
                    }
                    break;
                default:
                    GrAssert(!"Unknown path fill!");
                    return;
            }
        }
    }

    GrPoint pts[4];

    bool first = true;
    int subpath = 0;

    SkPath::Iter iter(path, false);

    for (;;) {
        GrPathCmd cmd = (GrPathCmd)iter.next(pts);
        switch (cmd) {
            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:
    GrAssert(subpath == subpathCnt);
    GrAssert((vert - base) <= maxPts);

    if (translate) {
        int count = vert - base;
        for (int i = 0; i < count; i++) {
            base[i].offset(translate->fX, translate->fY);
        }
    }

    // if we're stenciling we will follow with a pass that draws
    // a bounding rect to set the color. We're stenciling when
    // passCount > 1.
    const int& boundVertexStart = maxPts;
    GrPoint* boundsVerts = base + boundVertexStart;
    if (lastPassIsBounds) {
        GrRect bounds;
        if (reverse) {
            GrAssert(NULL != target->getRenderTarget());
            // draw over the whole world.
            bounds.setLTRB(0, 0,
                           GrIntToScalar(target->getRenderTarget()->width()),
                           GrIntToScalar(target->getRenderTarget()->height()));
            GrMatrix vmi;
            if (target->getViewInverse(&vmi)) {
                vmi.mapRect(&bounds);
            }
        } else {
            bounds.setBounds((GrPoint*)base, vert - base);
        }
        boundsVerts[0].setRectFan(bounds.fLeft, bounds.fTop, bounds.fRight,
                                  bounds.fBottom);
    }

    for (int p = 0; p < passCount; ++p) {
        target->setDrawFace(drawFace[p]);
        if (NULL != passes[p]) {
            target->setStencil(*passes[p]);
        }

        if (lastPassIsBounds && (p == passCount-1)) {
            if (!colorWritesWereDisabled) {
                target->disableState(GrDrawTarget::kNoColorWrites_StateBit);
            }
            target->drawNonIndexed(kTriangleFan_PrimitiveType,
                                   boundVertexStart, 4);

        } else {
            if (passCount > 1) {
                target->enableState(GrDrawTarget::kNoColorWrites_StateBit);
            }
            int baseVertex = 0;
            for (int sp = 0; sp < subpathCnt; ++sp) {
                target->drawNonIndexed(type,
                                      baseVertex,
                                      subpathVertCount[sp]);
                baseVertex += subpathVertCount[sp];
            }
        }
    }
}
Пример #11
0
void GrInOrderDrawBuffer::drawRect(const GrRect& rect,
                                   const GrMatrix* matrix,
                                   StageBitfield stageEnableBitfield,
                                   const GrRect* srcRects[],
                                   const GrMatrix* srcMatrices[]) {

    GrAssert(!(NULL == fQuadIndexBuffer && fCurrQuad));
    GrAssert(!(fDraws.empty() && fCurrQuad));
    GrAssert(!(0 != fMaxQuads && NULL == fQuadIndexBuffer));

    // if we have a quad IB then either append to the previous run of
    // rects or start a new run
    if (fMaxQuads) {

        bool appendToPreviousDraw = false;
        GrVertexLayout layout = GetRectVertexLayout(stageEnableBitfield, srcRects);
        AutoReleaseGeometry geo(this, layout, 4, 0);
        AutoViewMatrixRestore avmr(this);
        GrMatrix combinedMatrix = this->getViewMatrix();
        this->setViewMatrix(GrMatrix::I());
        if (NULL != matrix) {
            combinedMatrix.preConcat(*matrix);
        }

        SetRectVertices(rect, &combinedMatrix, srcRects, srcMatrices, layout, geo.vertices());

        // we don't want to miss an opportunity to batch rects together
        // simply because the clip has changed if the clip doesn't affect
        // the rect.
        bool disabledClip = false;
        if (this->isClipState() && fClip.isRect()) {

            GrRect clipRect = fClip.getRect(0);
            // If the clip rect touches the edge of the viewport, extended it
            // out (close) to infinity to avoid bogus intersections.
            // We might consider a more exact clip to viewport if this
            // conservative test fails.
            const GrRenderTarget* target = this->getRenderTarget();
            if (0 >= clipRect.fLeft) {
                clipRect.fLeft = GR_ScalarMin;
            }
            if (target->width() <= clipRect.fRight) {
                clipRect.fRight = GR_ScalarMax;
            }
            if (0 >= clipRect.top()) {
                clipRect.fTop = GR_ScalarMin;
            }
            if (target->height() <= clipRect.fBottom) {
                clipRect.fBottom = GR_ScalarMax;
            }
            int stride = VertexSize(layout);
            bool insideClip = true;
            for (int v = 0; v < 4; ++v) {
                const GrPoint& p = *GetVertexPoint(geo.vertices(), v, stride);
                if (!clipRect.contains(p)) {
                    insideClip = false;
                    break;
                }
            }
            if (insideClip) {
                this->disableState(kClip_StateBit);
                disabledClip = true;
            }
        }
        if (!needsNewClip() && !needsNewState() && fCurrQuad > 0 &&
            fCurrQuad < fMaxQuads && layout == fLastRectVertexLayout) {

            int vsize = VertexSize(layout);

            Draw& lastDraw = fDraws.back();

            GrAssert(lastDraw.fIndexBuffer == fQuadIndexBuffer);
            GrAssert(kTriangles_PrimitiveType == lastDraw.fPrimitiveType);
            GrAssert(0 == lastDraw.fVertexCount % 4);
            GrAssert(0 == lastDraw.fIndexCount % 6);
            GrAssert(0 == lastDraw.fStartIndex);

            GeometryPoolState& poolState = fGeoPoolStateStack.back();
            bool clearSinceLastDraw =
                            fClears.count() && 
                            fClears.back().fBeforeDrawIdx == fDraws.count();

            appendToPreviousDraw =  
                !clearSinceLastDraw &&
                lastDraw.fVertexBuffer == poolState.fPoolVertexBuffer &&
                (fCurrQuad * 4 + lastDraw.fStartVertex) == poolState.fPoolStartVertex;

            if (appendToPreviousDraw) {
                lastDraw.fVertexCount += 4;
                lastDraw.fIndexCount += 6;
                fCurrQuad += 1;
                // we reserved above, so we should be the first
                // use of this vertex reserveation.
                GrAssert(0 == poolState.fUsedPoolVertexBytes);
                poolState.fUsedPoolVertexBytes = 4 * vsize;
            }
        }
        if (!appendToPreviousDraw) {
            this->setIndexSourceToBuffer(fQuadIndexBuffer);
            drawIndexed(kTriangles_PrimitiveType, 0, 0, 4, 6);
            fCurrQuad = 1;
            fLastRectVertexLayout = layout;
        }
        if (disabledClip) {
            this->enableState(kClip_StateBit);
        }
    } else {
        INHERITED::drawRect(rect, matrix, stageEnableBitfield, srcRects, srcMatrices);
    }
}
Пример #12
0
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;
}
Пример #13
0
bool GrDefaultPathRenderer::internalDrawPath(const SkPath& path,
                                             GrPathFill fill,
                                             GrDrawTarget* target,
                                             bool stencilOnly) {

    GrMatrix viewM = target->getDrawState().getViewMatrix();
    GrScalar tol = GR_Scalar1;
    tol = GrPathUtils::scaleToleranceToSrc(tol, viewM, path.getBounds());

    int vertexCnt;
    int indexCnt;
    GrPrimitiveType primType;
    GrDrawTarget::AutoReleaseGeometry arg;
    if (!this->createGeom(path,
                          fill,
                          tol,
                          target,
                          &primType,
                          &vertexCnt,
                          &indexCnt,
                          &arg)) {
        return false;
    }

    GrAssert(NULL != target);
    GrDrawTarget::AutoStateRestore asr(target, GrDrawTarget::kPreserve_ASRInit);
    GrDrawState* drawState = target->drawState();
    bool colorWritesWereDisabled = drawState->isColorWriteDisabled();
    // face culling doesn't make sense here
    GrAssert(GrDrawState::kBoth_DrawFace == drawState->getDrawFace());

    int                         passCount = 0;
    const GrStencilSettings*    passes[3];
    GrDrawState::DrawFace       drawFace[3];
    bool                        reverse = false;
    bool                        lastPassIsBounds;

    if (kHairLine_GrPathFill == fill) {
        passCount = 1;
        if (stencilOnly) {
            passes[0] = &gDirectToStencil;
        } else {
            passes[0] = NULL;
        }
        lastPassIsBounds = false;
        drawFace[0] = GrDrawState::kBoth_DrawFace;
    } else {
        if (single_pass_path(path, fill)) {
            passCount = 1;
            if (stencilOnly) {
                passes[0] = &gDirectToStencil;
            } else {
                passes[0] = NULL;
            }
            drawFace[0] = GrDrawState::kBoth_DrawFace;
            lastPassIsBounds = false;
        } else {
            switch (fill) {
                case kInverseEvenOdd_GrPathFill:
                    reverse = true;
                    // fallthrough
                case kEvenOdd_GrPathFill:
                    passes[0] = &gEOStencilPass;
                    if (stencilOnly) {
                        passCount = 1;
                        lastPassIsBounds = false;
                    } else {
                        passCount = 2;
                        lastPassIsBounds = true;
                        if (reverse) {
                            passes[1] = &gInvEOColorPass;
                        } else {
                            passes[1] = &gEOColorPass;
                        }
                    }
                    drawFace[0] = drawFace[1] = GrDrawState::kBoth_DrawFace;
                    break;

                case kInverseWinding_GrPathFill:
                    reverse = true;
                    // fallthrough
                case kWinding_GrPathFill:
                    if (fSeparateStencil) {
                        if (fStencilWrapOps) {
                            passes[0] = &gWindStencilSeparateWithWrap;
                        } else {
                            passes[0] = &gWindStencilSeparateNoWrap;
                        }
                        passCount = 2;
                        drawFace[0] = GrDrawState::kBoth_DrawFace;
                    } else {
                        if (fStencilWrapOps) {
                            passes[0] = &gWindSingleStencilWithWrapInc;
                            passes[1] = &gWindSingleStencilWithWrapDec;
                        } else {
                            passes[0] = &gWindSingleStencilNoWrapInc;
                            passes[1] = &gWindSingleStencilNoWrapDec;
                        }
                        // which is cw and which is ccw is arbitrary.
                        drawFace[0] = GrDrawState::kCW_DrawFace;
                        drawFace[1] = GrDrawState::kCCW_DrawFace;
                        passCount = 3;
                    }
                    if (stencilOnly) {
                        lastPassIsBounds = false;
                        --passCount;
                    } else {
                        lastPassIsBounds = true;
                        drawFace[passCount-1] = GrDrawState::kBoth_DrawFace;
                        if (reverse) {
                            passes[passCount-1] = &gInvWindColorPass;
                        } else {
                            passes[passCount-1] = &gWindColorPass;
                        }
                    }
                    break;
                default:
                    GrAssert(!"Unknown path fFill!");
                    return false;
            }
        }
    }

    {
    for (int p = 0; p < passCount; ++p) {
        drawState->setDrawFace(drawFace[p]);
        if (NULL != passes[p]) {
            *drawState->stencil() = *passes[p];
        }

        if (lastPassIsBounds && (p == passCount-1)) {
            if (!colorWritesWereDisabled) {
                drawState->disableState(GrDrawState::kNoColorWrites_StateBit);
            }
            GrRect bounds;
            GrDrawState::AutoDeviceCoordDraw adcd;
            if (reverse) {
                GrAssert(NULL != drawState->getRenderTarget());
                // draw over the whole world.
                bounds.setLTRB(0, 0,
                               GrIntToScalar(drawState->getRenderTarget()->width()),
                               GrIntToScalar(drawState->getRenderTarget()->height()));
                GrMatrix vmi;
                // mapRect through persp matrix may not be correct
                if (!drawState->getViewMatrix().hasPerspective() &&
                    drawState->getViewInverse(&vmi)) {
                    vmi.mapRect(&bounds);
                } else {
                    adcd.set(drawState);
                }
            } else {
                bounds = path.getBounds();
            }
            GrDrawTarget::AutoGeometryPush agp(target);
            target->drawSimpleRect(bounds, NULL);
        } else {
            if (passCount > 1) {
                drawState->enableState(GrDrawState::kNoColorWrites_StateBit);
            }
            if (indexCnt) {
                target->drawIndexed(primType, 0, 0,
                                    vertexCnt, indexCnt);
            } else {
                target->drawNonIndexed(primType, 0, vertexCnt);
            }
        }
    }
    }
    return true;
}
void GrInOrderDrawBuffer::drawRect(const GrRect& rect,
                                   const SkMatrix* matrix,
                                   const GrRect* srcRects[],
                                   const SkMatrix* srcMatrices[]) {

    GrAssert(!(NULL == fQuadIndexBuffer && fCurrQuad));
    GrAssert(!(fDraws.empty() && fCurrQuad));
    GrAssert(!(0 != fMaxQuads && NULL == fQuadIndexBuffer));

    GrDrawState* drawState = this->drawState();

    // if we have a quad IB then either append to the previous run of
    // rects or start a new run
    if (fMaxQuads) {

        bool appendToPreviousDraw = false;
        GrVertexLayout layout = GetRectVertexLayout(srcRects);

        // Batching across colors means we move the draw color into the
        // rect's vertex colors to allow greater batching (a lot of rects
        // in a row differing only in color is a common occurence in tables).
        bool batchAcrossColors = true;
        if (!this->getCaps().dualSourceBlendingSupport()) {
            for (int s = 0; s < GrDrawState::kNumStages; ++s) {
                if (this->getDrawState().isStageEnabled(s)) {
                    // We disable batching across colors when there is a texture
                    // present because (by pushing the the color to the vertices)
                    // Ganesh loses track of the rect's opacity. This, in turn, can
                    // cause some of the blending optimizations to be disabled. This
                    // becomes a huge problem on some of the smaller devices where
                    // shader derivatives and dual source blending aren't supported.
                    // In those cases paths are often drawn to a texture and then
                    // drawn as a texture (using this method). Because dual source
                    // blending is disabled (and the blend optimizations are short
                    // circuited) some of the more esoteric blend modes can no longer
                    // be supported.
                    // TODO: add tracking of batchAcrossColors's opacity
                    batchAcrossColors = false;
                    break;
                }
            }
        }

        if (batchAcrossColors) {
            layout |= GrDrawState::kColor_VertexLayoutBit;
        }

        AutoReleaseGeometry geo(this, layout, 4, 0);
        if (!geo.succeeded()) {
            GrPrintf("Failed to get space for vertices!\n");
            return;
        }
        SkMatrix combinedMatrix = drawState->getViewMatrix();
        // We go to device space so that matrix changes allow us to concat
        // rect draws. When the caller has provided explicit source rects
        // then we don't want to modify the stages' matrices. Otherwise
        // we have to account for the view matrix change in the stage
        // matrices.
        uint32_t explicitCoordMask = 0;
        if (srcRects) {
            for (int s = 0; s < GrDrawState::kNumStages; ++s) {
                if (srcRects[s]) {
                    explicitCoordMask |= (1 << s);
                }
            }
        }
        GrDrawState::AutoDeviceCoordDraw adcd(this->drawState(), explicitCoordMask);
        if (!adcd.succeeded()) {
            return;
        }
        if (NULL != matrix) {
            combinedMatrix.preConcat(*matrix);
        }

        SetRectVertices(rect, &combinedMatrix, srcRects, srcMatrices,
                        this->getDrawState().getColor(), layout, geo.vertices());

        // Now that the paint's color is stored in the vertices set it to
        // white so that the following code can batch all the rects regardless
        // of paint color
        GrDrawState::AutoColorRestore acr(this->drawState(),
                                          batchAcrossColors ? SK_ColorWHITE
                                                            : this->getDrawState().getColor());

        // we don't want to miss an opportunity to batch rects together
        // simply because the clip has changed if the clip doesn't affect
        // the rect.
        bool disabledClip = false;

        if (drawState->isClipState()) {

            GrRect devClipRect;
            bool isIntersectionOfRects = false;
            const GrClipData* clip = this->getClip();
            clip->fClipStack->getConservativeBounds(-clip->fOrigin.fX,
                                                    -clip->fOrigin.fY,
                                                    drawState->getRenderTarget()->width(),
                                                    drawState->getRenderTarget()->height(),
                                                    &devClipRect,
                                                    &isIntersectionOfRects);

            if (isIntersectionOfRects) {
                // If the clip rect touches the edge of the viewport, extended it
                // out (close) to infinity to avoid bogus intersections.
                // We might consider a more exact clip to viewport if this
                // conservative test fails.
                const GrRenderTarget* target = drawState->getRenderTarget();
                if (0 >= devClipRect.fLeft) {
                    devClipRect.fLeft = SK_ScalarMin;
                }
                if (target->width() <= devClipRect.fRight) {
                    devClipRect.fRight = SK_ScalarMax;
                }
                if (0 >= devClipRect.top()) {
                    devClipRect.fTop = SK_ScalarMin;
                }
                if (target->height() <= devClipRect.fBottom) {
                    devClipRect.fBottom = SK_ScalarMax;
                }
                int stride = GrDrawState::VertexSize(layout);
                bool insideClip = true;
                for (int v = 0; v < 4; ++v) {
                    const GrPoint& p = *GrDrawState::GetVertexPoint(geo.vertices(), v, stride);
                    if (!devClipRect.contains(p)) {
                        insideClip = false;
                        break;
                    }
                }
                if (insideClip) {
                    drawState->disableState(GrDrawState::kClip_StateBit);
                    disabledClip = true;
                }
            }
        }

        if (!this->needsNewClip() &&
            !this->needsNewState() &&
            fCurrQuad > 0 &&
            fCurrQuad < fMaxQuads &&
            layout == fLastRectVertexLayout) {

            int vsize = GrDrawState::VertexSize(layout);

            Draw& lastDraw = fDraws.back();

            GrAssert(lastDraw.fIndexBuffer == fQuadIndexBuffer);
            GrAssert(kTriangles_GrPrimitiveType == lastDraw.fPrimitiveType);
            GrAssert(0 == lastDraw.fVertexCount % 4);
            GrAssert(0 == lastDraw.fIndexCount % 6);
            GrAssert(0 == lastDraw.fStartIndex);

            GeometryPoolState& poolState = fGeoPoolStateStack.back();

            appendToPreviousDraw =
                kDraw_Cmd == fCmds.back() &&
                lastDraw.fVertexBuffer == poolState.fPoolVertexBuffer &&
                (fCurrQuad * 4 + lastDraw.fStartVertex) == poolState.fPoolStartVertex;

            if (appendToPreviousDraw) {
                lastDraw.fVertexCount += 4;
                lastDraw.fIndexCount += 6;
                fCurrQuad += 1;
                // we reserved above, so we should be the first
                // use of this vertex reservation.
                GrAssert(0 == poolState.fUsedPoolVertexBytes);
                poolState.fUsedPoolVertexBytes = 4 * vsize;
            }
        }
        if (!appendToPreviousDraw) {
            this->setIndexSourceToBuffer(fQuadIndexBuffer);
            this->drawIndexed(kTriangles_GrPrimitiveType, 0, 0, 4, 6);
            fCurrQuad = 1;
            fLastRectVertexLayout = layout;
        }
        if (disabledClip) {
            drawState->enableState(GrDrawState::kClip_StateBit);
        }
        fInstancedDrawTracker.reset();
    } else {
        INHERITED::drawRect(rect, matrix, srcRects, srcMatrices);
    }
}
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;
}
Пример #16
0
////////////////////////////////////////////////////////////////////////////////
// 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;
}
Пример #17
0
void GrAARectRenderer::strokeAARect(GrGpu* gpu,
                                    GrDrawTarget* target,
                                    const GrRect& devRect,
                                    const GrVec& devStrokeSize,
                                    bool useVertexCoverage) {
    const SkScalar& dx = devStrokeSize.fX;
    const SkScalar& dy = devStrokeSize.fY;
    const SkScalar rx = SkScalarMul(dx, SK_ScalarHalf);
    const SkScalar ry = SkScalarMul(dy, SK_ScalarHalf);

    SkScalar spare;
    {
        SkScalar w = devRect.width() - dx;
        SkScalar h = devRect.height() - dy;
        spare = GrMin(w, h);
    }

    if (spare <= 0) {
        GrRect r(devRect);
        r.inset(-rx, -ry);
        this->fillAARect(gpu, target, r, useVertexCoverage);
        return;
    }
    GrVertexLayout layout = aa_rect_layout(useVertexCoverage);
    size_t vsize = GrDrawTarget::VertexSize(layout);

    GrDrawTarget::AutoReleaseGeometry geo(target, layout, 16, 0);
    if (!geo.succeeded()) {
        GrPrintf("Failed to get space for vertices!\n");
        return;
    }
    GrIndexBuffer* indexBuffer = this->aaStrokeRectIndexBuffer(gpu);
    if (NULL == indexBuffer) {
        GrPrintf("Failed to create index buffer!\n");
        return;
    }

    intptr_t verts = reinterpret_cast<intptr_t>(geo.vertices());

    // We create vertices for four nested rectangles. There are two ramps from 0 to full
    // coverage, one on the exterior of the stroke and the other on the interior.
    // The following pointers refer to the four rects, from outermost to innermost.
    GrPoint* fan0Pos = reinterpret_cast<GrPoint*>(verts);
    GrPoint* fan1Pos = reinterpret_cast<GrPoint*>(verts + 4 * vsize);
    GrPoint* fan2Pos = reinterpret_cast<GrPoint*>(verts + 8 * vsize);
    GrPoint* fan3Pos = reinterpret_cast<GrPoint*>(verts + 12 * vsize);

    set_inset_fan(fan0Pos, vsize, devRect,
                  -rx - SK_ScalarHalf, -ry - SK_ScalarHalf);
    set_inset_fan(fan1Pos, vsize, devRect,
                  -rx + SK_ScalarHalf, -ry + SK_ScalarHalf);
    set_inset_fan(fan2Pos, vsize, devRect,
                  rx - SK_ScalarHalf,  ry - SK_ScalarHalf);
    set_inset_fan(fan3Pos, vsize, devRect,
                  rx + SK_ScalarHalf,  ry + SK_ScalarHalf);

    // The outermost rect has 0 coverage
    verts += sizeof(GrPoint);
    for (int i = 0; i < 4; ++i) {
        *reinterpret_cast<GrColor*>(verts + i * vsize) = 0;
    }

    // The inner two rects have full coverage
    GrColor innerColor;
    if (useVertexCoverage) {
        innerColor = 0xffffffff;
    } else {
        innerColor = target->getDrawState().getColor();
    }
    verts += 4 * vsize;
    for (int i = 0; i < 8; ++i) {
        *reinterpret_cast<GrColor*>(verts + i * vsize) = innerColor;
    }

    // The innermost rect has full coverage
    verts += 8 * vsize;
    for (int i = 0; i < 4; ++i) {
        *reinterpret_cast<GrColor*>(verts + i * vsize) = 0;
    }

    target->setIndexSourceToBuffer(indexBuffer);
    target->drawIndexed(kTriangles_GrPrimitiveType,
                        0, 0, 16, aaStrokeRectIndexCount());
}
Пример #18
0
////////////////////////////////////////////////////////////////////////////////
// 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;
}
Пример #19
0
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;
}
Пример #20
0
void GrDefaultPathRenderer::onDrawPath(GrDrawTarget::StageBitfield stages,
                                       bool stencilOnly) {

    GrMatrix viewM = fTarget->getViewMatrix();
    GrScalar tol = GR_Scalar1;
    tol = GrPathUtils::scaleToleranceToSrc(tol, viewM, fPath->getBounds());

    // FIXME: It's really dumb that we recreate the verts for a new vertex
    // layout. We only do that because the GrDrawTarget API doesn't allow
    // us to change the vertex layout after reserveVertexSpace(). We won't
    // actually change the vertex data when the layout changes since all the
    // stages reference the positions (rather than having separate tex coords)
    // and we don't ever have per-vert colors. In practice our call sites
    // won't change the stages in use inside a setPath / removePath pair. But
    // it is a silly limitation of the GrDrawTarget design that should be fixed.
    if (tol != fPreviousSrcTol ||
        stages != fPreviousStages) {
        if (!this->createGeom(tol, stages)) {
            return;
        }
    }

    GrAssert(NULL != fTarget);
    GrDrawTarget::AutoStateRestore asr(fTarget);
    bool colorWritesWereDisabled = fTarget->isColorWriteDisabled();
    // face culling doesn't make sense here
    GrAssert(GrDrawTarget::kBoth_DrawFace == fTarget->getDrawFace());

    int                         passCount = 0;
    const GrStencilSettings*    passes[3];
    GrDrawTarget::DrawFace      drawFace[3];
    bool                        reverse = false;
    bool                        lastPassIsBounds;

    if (kHairLine_PathFill == fFill) {
        passCount = 1;
        if (stencilOnly) {
            passes[0] = &gDirectToStencil;
        } else {
            passes[0] = NULL;
        }
        lastPassIsBounds = false;
        drawFace[0] = GrDrawTarget::kBoth_DrawFace;
    } else {
        if (single_pass_path(*fTarget, *fPath, fFill)) {
            passCount = 1;
            if (stencilOnly) {
                passes[0] = &gDirectToStencil;
            } else {
                passes[0] = NULL;
            }
            drawFace[0] = GrDrawTarget::kBoth_DrawFace;
            lastPassIsBounds = false;
        } else {
            switch (fFill) {
                case kInverseEvenOdd_PathFill:
                    reverse = true;
                    // fallthrough
                case kEvenOdd_PathFill:
                    passes[0] = &gEOStencilPass;
                    if (stencilOnly) {
                        passCount = 1;
                        lastPassIsBounds = false;
                    } else {
                        passCount = 2;
                        lastPassIsBounds = true;
                        if (reverse) {
                            passes[1] = &gInvEOColorPass;
                        } else {
                            passes[1] = &gEOColorPass;
                        }
                    }
                    drawFace[0] = drawFace[1] = GrDrawTarget::kBoth_DrawFace;
                    break;

                case kInverseWinding_PathFill:
                    reverse = true;
                    // fallthrough
                case kWinding_PathFill:
                    if (fSeparateStencil) {
                        if (fStencilWrapOps) {
                            passes[0] = &gWindStencilSeparateWithWrap;
                        } else {
                            passes[0] = &gWindStencilSeparateNoWrap;
                        }
                        passCount = 2;
                        drawFace[0] = GrDrawTarget::kBoth_DrawFace;
                    } else {
                        if (fStencilWrapOps) {
                            passes[0] = &gWindSingleStencilWithWrapInc;
                            passes[1] = &gWindSingleStencilWithWrapDec;
                        } else {
                            passes[0] = &gWindSingleStencilNoWrapInc;
                            passes[1] = &gWindSingleStencilNoWrapDec;
                        }
                        // which is cw and which is ccw is arbitrary.
                        drawFace[0] = GrDrawTarget::kCW_DrawFace;
                        drawFace[1] = GrDrawTarget::kCCW_DrawFace;
                        passCount = 3;
                    }
                    if (stencilOnly) {
                        lastPassIsBounds = false;
                        --passCount;
                    } else {
                        lastPassIsBounds = true;
                        drawFace[passCount-1] = GrDrawTarget::kBoth_DrawFace;
                        if (reverse) {
                            passes[passCount-1] = &gInvWindColorPass;
                        } else {
                            passes[passCount-1] = &gWindColorPass;
                        }
                    }
                    break;
                default:
                    GrAssert(!"Unknown path fFill!");
                    return;
            }
        }
    }

    {
    for (int p = 0; p < passCount; ++p) {
        fTarget->setDrawFace(drawFace[p]);
        if (NULL != passes[p]) {
            fTarget->setStencil(*passes[p]);
        }

        if (lastPassIsBounds && (p == passCount-1)) {
            if (!colorWritesWereDisabled) {
                fTarget->disableState(GrDrawTarget::kNoColorWrites_StateBit);
            }
            GrRect bounds;
            if (reverse) {
                GrAssert(NULL != fTarget->getRenderTarget());
                // draw over the whole world.
                bounds.setLTRB(0, 0,
                               GrIntToScalar(fTarget->getRenderTarget()->width()),
                               GrIntToScalar(fTarget->getRenderTarget()->height()));
                GrMatrix vmi;
                // mapRect through persp matrix may not be correct
                if (!fTarget->getViewMatrix().hasPerspective() &&
                    fTarget->getViewInverse(&vmi)) {
                    vmi.mapRect(&bounds);
                } else {
                    if (stages) {
                        if (!fTarget->getViewInverse(&vmi)) {
                            GrPrintf("Could not invert matrix.");
                            return;
                        }
                        fTarget->preConcatSamplerMatrices(stages, vmi);
                    }
                    fTarget->setViewMatrix(GrMatrix::I());
                }
            } else {
                bounds = fPath->getBounds();
                bounds.offset(fTranslate);
            }
            GrDrawTarget::AutoGeometryPush agp(fTarget);
            fTarget->drawSimpleRect(bounds, NULL, stages);
        } else {
            if (passCount > 1) {
                fTarget->enableState(GrDrawTarget::kNoColorWrites_StateBit);
            }
            if (fUseIndexedDraw) {
                fTarget->drawIndexed(fPrimitiveType, 0, 0, 
                                     fVertexCnt, fIndexCnt);
            } else {
                int baseVertex = 0;
                for (int sp = 0; sp < fSubpathCount; ++sp) {
                    fTarget->drawNonIndexed(fPrimitiveType, baseVertex,
                                            fSubpathVertCount[sp]);
                    baseVertex += fSubpathVertCount[sp];
                }
            }
        }
    }
    }
}
////////////////////////////////////////////////////////////////////////////////
// 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;
}