コード例 #1
0
void SkScalerContext::getMetrics(SkGlyph* glyph) {
    generateMetrics(glyph);

    // for now we have separate cache entries for devkerning on and off
    // in the future we might share caches, but make our measure/draw
    // code make the distinction. Thus we zap the values if the caller
    // has not asked for them.
    if ((fRec.fFlags & SkScalerContext::kDevKernText_Flag) == 0) {
        // no devkern, so zap the fields
        glyph->fLsbDelta = glyph->fRsbDelta = 0;
    }

    // if either dimension is empty, zap the image bounds of the glyph
    if (0 == glyph->fWidth || 0 == glyph->fHeight) {
        glyph->fWidth   = 0;
        glyph->fHeight  = 0;
        glyph->fTop     = 0;
        glyph->fLeft    = 0;
        glyph->fMaskFormat = 0;
        return;
    }

    if (fGenerateImageFromPath) {
        SkPath      devPath, fillPath;
        SkMatrix    fillToDevMatrix;

        this->internalGetPath(*glyph, &fillPath, &devPath, &fillToDevMatrix);

        if (fRasterizer) {
            SkMask  mask;

            if (fRasterizer->rasterize(fillPath, fillToDevMatrix, nullptr,
                                       fMaskFilter, &mask,
                                       SkMask::kJustComputeBounds_CreateMode)) {
                glyph->fLeft    = mask.fBounds.fLeft;
                glyph->fTop     = mask.fBounds.fTop;
                glyph->fWidth   = SkToU16(mask.fBounds.width());
                glyph->fHeight  = SkToU16(mask.fBounds.height());
            } else {
                goto SK_ERROR;
            }
        } else {
            // just use devPath
            const SkIRect ir = devPath.getBounds().roundOut();

            if (ir.isEmpty() || !ir.is16Bit()) {
                goto SK_ERROR;
            }
            glyph->fLeft    = ir.fLeft;
            glyph->fTop     = ir.fTop;
            glyph->fWidth   = SkToU16(ir.width());
            glyph->fHeight  = SkToU16(ir.height());

            if (glyph->fWidth > 0) {
                switch (fRec.fMaskFormat) {
                case SkMask::kLCD16_Format:
                    glyph->fWidth += 2;
                    glyph->fLeft -= 1;
                    break;
                default:
                    break;
                }
            }
        }
    }

    if (SkMask::kARGB32_Format != glyph->fMaskFormat) {
        glyph->fMaskFormat = fRec.fMaskFormat;
    }

    // If we are going to create the mask, then we cannot keep the color
    if ((fGenerateImageFromPath || fMaskFilter) &&
            SkMask::kARGB32_Format == glyph->fMaskFormat) {
        glyph->fMaskFormat = SkMask::kA8_Format;
    }

    if (fMaskFilter) {
        SkMask      src, dst;
        SkMatrix    matrix;

        glyph->toMask(&src);
        fRec.getMatrixFrom2x2(&matrix);

        src.fImage = nullptr;  // only want the bounds from the filter
        if (fMaskFilter->filterMask(&dst, src, matrix, nullptr)) {
            if (dst.fBounds.isEmpty() || !dst.fBounds.is16Bit()) {
                goto SK_ERROR;
            }
            SkASSERT(dst.fImage == nullptr);
            glyph->fLeft    = dst.fBounds.fLeft;
            glyph->fTop     = dst.fBounds.fTop;
            glyph->fWidth   = SkToU16(dst.fBounds.width());
            glyph->fHeight  = SkToU16(dst.fBounds.height());
            glyph->fMaskFormat = dst.fFormat;
        }
    }
    return;

SK_ERROR:
    // draw nothing 'cause we failed
    glyph->fLeft    = 0;
    glyph->fTop     = 0;
    glyph->fWidth   = 0;
    glyph->fHeight  = 0;
    // put a valid value here, in case it was earlier set to
    // MASK_FORMAT_JUST_ADVANCE
    glyph->fMaskFormat = fRec.fMaskFormat;
}
コード例 #2
0
void SkScalerContext_CairoFT::generateAdvance(SkGlyph* glyph)
{
    generateMetrics(glyph);
}