C++ GrIRect类代码示例

void GrSWMaskHelper::DrawToTargetWithPathMask(GrTexture* texture,
                                              GrDrawTarget* target,
                                              const GrIRect& rect) {
    GrDrawState* drawState = target->drawState();

    GrDrawState::AutoDeviceCoordDraw adcd(drawState);
    if (!adcd.succeeded()) {
        return;
    }
    enum {
        // the SW path renderer shares this stage with glyph
        // rendering (kGlyphMaskStage in GrBatchedTextContext)
        kPathMaskStage = GrPaint::kTotalStages,
    };
    GrAssert(!drawState->isStageEnabled(kPathMaskStage));
    drawState->stage(kPathMaskStage)->reset();
    drawState->createTextureEffect(kPathMaskStage, texture);
    SkScalar w = SkIntToScalar(rect.width());
    SkScalar h = SkIntToScalar(rect.height());
    GrRect maskRect = GrRect::MakeWH(w / texture->width(),
                                     h / texture->height());

    const GrRect* srcRects[GrDrawState::kNumStages] = { NULL };
    srcRects[kPathMaskStage] = &maskRect;
    GrRect dstRect = GrRect::MakeLTRB(
                            SK_Scalar1 * rect.fLeft,
                            SK_Scalar1 * rect.fTop,
                            SK_Scalar1 * rect.fRight,
                            SK_Scalar1 * rect.fBottom);
    target->drawRect(dstRect, NULL, srcRects, NULL);
    drawState->disableStage(kPathMaskStage);
}

bool GrSWMaskHelper::init(const GrIRect& pathDevBounds, const GrPoint* translate) {
    fMatrix = fContext->getMatrix();
    if (NULL != translate) {
        fMatrix.postTranslate(translate->fX, translate->fY);
    }

    fMatrix.postTranslate(-pathDevBounds.fLeft * SK_Scalar1,
                            -pathDevBounds.fTop * SK_Scalar1);
    GrIRect bounds = GrIRect::MakeWH(pathDevBounds.width(),
                                        pathDevBounds.height());

    fBM.setConfig(SkBitmap::kA8_Config, bounds.fRight, bounds.fBottom);
    if (!fBM.allocPixels()) {
        return false;
    }
    sk_bzero(fBM.getPixels(), fBM.getSafeSize());

    sk_bzero(&fDraw, sizeof(fDraw));
    fRasterClip.setRect(bounds);
    fDraw.fRC    = &fRasterClip;
    fDraw.fClip  = &fRasterClip.bwRgn();
    fDraw.fMatrix = &fMatrix;
    fDraw.fBitmap = &fBM;
    return true;
}

////////////////////////////////////////////////////////////////////////////////
// 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;
}

void GrClipMaskManager::setupCache(const GrClip& clipIn,
                                   const GrIRect& bounds) {
    // Since we are setting up the cache we know the last lookup was a miss
    // Free up the currently cached mask so it can be reused
    fAACache.reset();

    const GrTextureDesc desc = {
        kRenderTarget_GrTextureFlagBit|kNoStencil_GrTextureFlagBit,
        bounds.width(),
        bounds.height(),
        kAlpha_8_GrPixelConfig,
        0           // samples
    };

    fAACache.acquireMask(clipIn, desc, bounds);
}

void GrInOrderDrawBuffer::clear(const GrIRect* rect, GrColor color) {
    GrIRect r;
    if (NULL == rect) {
        // We could do something smart and remove previous draws and clears to
        // the current render target. If we get that smart we have to make sure
        // those draws aren't read before this clear (render-to-texture).
        r.setLTRB(0, 0, 
                  this->getRenderTarget()->width(), 
                  this->getRenderTarget()->height());
        rect = &r;
    }
    Clear& clr = fClears.push_back();
    clr.fColor = color;
    clr.fBeforeDrawIdx = fDraws.count();
    clr.fRect = *rect;
}

// get a texture to act as a temporary buffer for AA clip boolean operations
// TODO: given the expense of createTexture we may want to just cache this too
void GrClipMaskManager::getTemp(const GrIRect& bounds, 
                                GrAutoScratchTexture* temp) {
    if (NULL != temp->texture()) {
        // we've already allocated the temp texture
        return;
    }

    const GrTextureDesc desc = {
        kRenderTarget_GrTextureFlagBit|kNoStencil_GrTextureFlagBit,
        bounds.width(),
        bounds.height(),
        kAlpha_8_GrPixelConfig,
        0           // samples
    };

    temp->set(fAACache.getContext(), desc);
}

void GrInOrderDrawBuffer::clear(const GrIRect* rect, GrColor color, GrRenderTarget* renderTarget) {
    GrIRect r;
    if (NULL == renderTarget) {
        renderTarget = this->drawState()->getRenderTarget();
        GrAssert(NULL != renderTarget);
    }
    if (NULL == rect) {
        // We could do something smart and remove previous draws and clears to
        // the current render target. If we get that smart we have to make sure
        // those draws aren't read before this clear (render-to-texture).
        r.setLTRB(0, 0, renderTarget->width(), renderTarget->height());
        rect = &r;
    }
    Clear* clr = this->recordClear();
    clr->fColor = color;
    clr->fRect = *rect;
    clr->fRenderTarget = renderTarget;
    renderTarget->ref();
}

void GrClip::setFromIRect(const GrIRect& r) {
    fList.reset();
    if (r.isEmpty()) {
        // use a canonical empty rect for == testing.
        setEmpty();
    } else {
        fList.push_back();
        fList.back().fRect.set(r);
        fList.back().fType = kRect_ClipType;
        fConservativeBounds.set(r);
        fConservativeBoundsValid = true;
    }
}

bool GrGpu::setupClipAndFlushState(GrPrimitiveType type) {
    const GrIRect* r = NULL;
    GrIRect clipRect;

    // we check this early because we need a valid
    // render target to setup stencil clipping
    // before even going into flushGraphicsState
    if (NULL == fCurrDrawState.fRenderTarget) {
        GrAssert(!"No render target bound.");
        return false;
    }

    if (fCurrDrawState.fFlagBits & kClip_StateBit) {
        GrRenderTarget& rt = *fCurrDrawState.fRenderTarget;

        GrRect bounds;
        GrRect rtRect;
        rtRect.setLTRB(0, 0,
                       GrIntToScalar(rt.width()), GrIntToScalar(rt.height()));
        if (fClip.hasConservativeBounds()) {
            bounds = fClip.getConservativeBounds();
            bounds.intersectWith(rtRect);
        } else {
            bounds = rtRect;
        }

        bounds.roundOut(&clipRect);
        if  (clipRect.isEmpty()) {
            clipRect.setLTRB(0,0,0,0);
        }
        r = &clipRect;

        fClipState.fClipInStencil = !fClip.isRect() &&
                                    !fClip.isEmpty() &&
                                    !bounds.isEmpty();

        if (fClipState.fClipInStencil &&
            (fClipState.fClipIsDirty ||
             fClip != rt.fLastStencilClip)) {

            rt.fLastStencilClip = fClip;
            // we set the current clip to the bounds so that our recursive
            // draws are scissored to them. We use the copy of the complex clip
            // in the rt to render
            const GrClip& clip = rt.fLastStencilClip;
            fClip.setFromRect(bounds);

            AutoStateRestore asr(this);
            AutoInternalDrawGeomRestore aidgr(this);

            this->setViewMatrix(GrMatrix::I());
            this->eraseStencilClip(clipRect);
            this->flushScissor(NULL);
#if !VISUALIZE_COMPLEX_CLIP
            this->enableState(kNoColorWrites_StateBit);
#else
            this->disableState(kNoColorWrites_StateBit);
#endif
            int count = clip.getElementCount();
            int clipBit = rt.stencilBits();
            clipBit = (1 << (clipBit-1));

            // often we'll see the first two elements of the clip are
            // the full rt size and another element intersected with it.
            // We can skip the first full-size rect and save a big rect draw.
            int firstElement = 0;
            if (clip.getElementCount() > 1 &&
                kRect_ClipType == clip.getElementType(0) &&
                kIntersect_SetOp == clip.getOp(1)&&
                clip.getRect(0).contains(bounds)) {
                firstElement = 1;
            }

            // walk through each clip element and perform its set op
            // with the existing clip.
            for (int c = firstElement; c < count; ++c) {
                GrPathFill fill;
                // enabled at bottom of loop
                this->disableState(kModifyStencilClip_StateBit);

                bool canDrawDirectToClip;
                if (kRect_ClipType == clip.getElementType(c)) {
                    canDrawDirectToClip = true;
                    fill = kEvenOdd_PathFill;
                } else {
                    fill = clip.getPathFill(c);
                    GrPathRenderer* pr = this->getPathRenderer();
                    canDrawDirectToClip = pr->requiresStencilPass(this, clip.getPath(c), fill);
                }

                GrSetOp op = firstElement == c ? kReplace_SetOp : clip.getOp(c);
                int passes;
                GrStencilSettings stencilSettings[GrStencilSettings::kMaxStencilClipPasses];

                canDrawDirectToClip = GrStencilSettings::GetClipPasses(op, canDrawDirectToClip,
                                                                       clipBit, IsFillInverted(fill),
                                                                       &passes, stencilSettings);

                // draw the element to the client stencil bits if necessary
                if (!canDrawDirectToClip) {
//.........这里部分代码省略.........

////////////////////////////////////////////////////////////////////////////////
// basic test of the cache's base functionality:
//  push, pop, set, canReuse & getters
static void test_cache(skiatest::Reporter* reporter, GrContext* context) {

    if (false) { // avoid bit rot, suppress warning
        createTexture(context);
    }
    GrClipMaskCache cache;

    cache.setContext(context);

    SkClipStack emptyClip;
    emptyClip.reset();

    GrIRect emptyBound;
    emptyBound.setEmpty();

    // check initial state
    check_state(reporter, cache, emptyClip, NULL, emptyBound);

    // set the current state
    GrIRect bound1;
    bound1.set(0, 0, 100, 100);

    SkClipStack clip1(bound1);

    GrTextureDesc desc;
    desc.fFlags = kRenderTarget_GrTextureFlagBit;
    desc.fWidth = X_SIZE;
    desc.fHeight = Y_SIZE;
    desc.fConfig = kSkia8888_PM_GrPixelConfig;

    cache.acquireMask(clip1, desc, bound1);

    GrTexture* texture1 = cache.getLastMask();
    REPORTER_ASSERT(reporter, texture1);
    if (NULL == texture1) {
        return;
    }

    // check that the set took
    check_state(reporter, cache, clip1, texture1, bound1);
    REPORTER_ASSERT(reporter, 1 == texture1->getRefCnt());

    // push the state
    cache.push();

    // verify that the pushed state is initially empty
    check_state(reporter, cache, emptyClip, NULL, emptyBound);
    REPORTER_ASSERT(reporter, 1 == texture1->getRefCnt());

    // modify the new state
    GrIRect bound2;
    bound2.set(-10, -10, 10, 10);

    SkClipStack clip2(bound2);

    cache.acquireMask(clip2, desc, bound2);

    GrTexture* texture2 = cache.getLastMask();
    REPORTER_ASSERT(reporter, texture2);
    if (NULL == texture2) {
        return;
    }

    // check that the changes took
    check_state(reporter, cache, clip2, texture2, bound2);
    REPORTER_ASSERT(reporter, 1 == texture1->getRefCnt());
    REPORTER_ASSERT(reporter, 1 == texture2->getRefCnt());

    // check to make sure canReuse works
    REPORTER_ASSERT(reporter, cache.canReuse(clip2, bound2));
    REPORTER_ASSERT(reporter, !cache.canReuse(clip1, bound1));

    // pop the state
    cache.pop();

    // verify that the old state is restored
    check_state(reporter, cache, clip1, texture1, bound1);
    REPORTER_ASSERT(reporter, 1 == texture1->getRefCnt());
    REPORTER_ASSERT(reporter, 1 == texture2->getRefCnt());

    // manually clear the state
    cache.reset();

    // verify it is now empty
    check_state(reporter, cache, emptyClip, NULL, emptyBound);
    REPORTER_ASSERT(reporter, 1 == texture1->getRefCnt());
    REPORTER_ASSERT(reporter, 1 == texture2->getRefCnt());

    // pop again - so there is no state
    cache.pop();

#if !defined(SK_DEBUG)
    // verify that the getters don't crash
    // only do in release since it generates asserts in debug
    check_state(reporter, cache, emptyClip, NULL, emptyBound);
#endif
    REPORTER_ASSERT(reporter, 1 == texture1->getRefCnt());
//.........这里部分代码省略.........

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;
}

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
//.........这里部分代码省略.........

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;
}