C++ GrIRect::height方法代码示例

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);
}

// 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);
}