C++ SkFont::getSize方法代码示例

SkFont GrTextContext::InitDistanceFieldFont(const SkFont& font,
                                            const SkMatrix& viewMatrix,
                                            const Options& options,
                                            SkScalar* textRatio) {
    SkScalar textSize = font.getSize();
    SkScalar scaledTextSize = scaled_text_size(textSize, viewMatrix);

    SkFont dfFont{font};

    if (scaledTextSize <= kSmallDFFontLimit) {
        *textRatio = textSize / kSmallDFFontSize;
        dfFont.setSize(SkIntToScalar(kSmallDFFontSize));
    } else if (scaledTextSize <= kMediumDFFontLimit) {
        *textRatio = textSize / kMediumDFFontSize;
        dfFont.setSize(SkIntToScalar(kMediumDFFontSize));
    } else {
        *textRatio = textSize / kLargeDFFontSize;
        dfFont.setSize(SkIntToScalar(kLargeDFFontSize));
    }

    dfFont.setEdging(SkFont::Edging::kAntiAlias);
    dfFont.setForceAutoHinting(false);
    dfFont.setHinting(SkFontHinting::kNormal);

    // The sub-pixel position will always happen when transforming to the screen.
    dfFont.setSubpixel(false);
    return dfFont;
}

    // Verify that text-related properties are captured in run paints.
    static void TestPaintProps(skiatest::Reporter* reporter) {
        SkFont font;
        // Kitchen sink font.
        font.setSize(42);
        font.setScaleX(4.2f);
        font.setTypeface(ToolUtils::create_portable_typeface());
        font.setSkewX(0.42f);
        font.setHinting(SkFontHinting::kFull);
        font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
        font.setEmbolden(true);
        font.setLinearMetrics(true);
        font.setSubpixel(true);
        font.setEmbeddedBitmaps(true);
        font.setForceAutoHinting(true);

        // Ensure we didn't pick default values by mistake.
        SkFont defaultFont;
        REPORTER_ASSERT(reporter, defaultFont.getSize() != font.getSize());
        REPORTER_ASSERT(reporter, defaultFont.getScaleX() != font.getScaleX());
        REPORTER_ASSERT(reporter, defaultFont.getTypefaceOrDefault() != font.getTypefaceOrDefault());
        REPORTER_ASSERT(reporter, defaultFont.getSkewX() != font.getSkewX());
        REPORTER_ASSERT(reporter, defaultFont.getHinting() != font.getHinting());
        REPORTER_ASSERT(reporter, defaultFont.getEdging() != font.getEdging());
        REPORTER_ASSERT(reporter, defaultFont.isEmbolden() != font.isEmbolden());
        REPORTER_ASSERT(reporter, defaultFont.isLinearMetrics() != font.isLinearMetrics());
        REPORTER_ASSERT(reporter, defaultFont.isSubpixel() != font.isSubpixel());
        REPORTER_ASSERT(reporter,
                        defaultFont.isEmbeddedBitmaps() != font.isEmbeddedBitmaps());
        REPORTER_ASSERT(reporter, defaultFont.isForceAutoHinting() != font.isForceAutoHinting());

        SkTextBlobBuilder builder;
        AddRun(font, 1, SkTextBlobRunIterator::kDefault_Positioning, SkPoint::Make(0, 0), builder);
        AddRun(font, 1, SkTextBlobRunIterator::kHorizontal_Positioning, SkPoint::Make(0, 0),
               builder);
        AddRun(font, 1, SkTextBlobRunIterator::kFull_Positioning, SkPoint::Make(0, 0), builder);
        sk_sp<SkTextBlob> blob(builder.make());

        SkTextBlobRunIterator it(blob.get());
        while (!it.done()) {
            REPORTER_ASSERT(reporter, it.font() == font);
            it.next();
        }

    }

static void applyKerning(SkPoint pos[], const int32_t adjustments[], int count,
                         const SkFont& font) {
    SkScalar scale = font.getSize() / font.getTypefaceOrDefault()->getUnitsPerEm();

    SkScalar globalAdj = 0;
    for (int i = 0; i < count - 1; ++i) {
        globalAdj += adjustments[i] * scale;
        pos[i + 1].fX += globalAdj;
    }
}

static void make_big_bitmap(SkBitmap* bm) {
    static const char gText[] =
        "We the people, in order to form a more perfect union, establish justice,"
        " ensure domestic tranquility, provide for the common defense, promote the"
        " general welfare and ensure the blessings of liberty to ourselves and our"
        " posterity, do ordain and establish this constitution for the United"
        " States of America.";

    const int BIG_H = 120;

    SkFont font;
    font.setSize(SkIntToScalar(BIG_H));

    const int BIG_W = SkScalarRoundToInt(font.measureText(gText, strlen(gText), SkTextEncoding::kUTF8));

    bm->allocN32Pixels(BIG_W, BIG_H);
    bm->eraseColor(SK_ColorWHITE);

    SkCanvas canvas(*bm);

    canvas.drawSimpleText(gText, strlen(gText), SkTextEncoding::kUTF8, 0, font.getSize()*4/5, font, SkPaint());
}

bool GrTextContext::CanDrawAsDistanceFields(const SkPaint& paint, const SkFont& font,
                                            const SkMatrix& viewMatrix,
                                            const SkSurfaceProps& props,
                                            bool contextSupportsDistanceFieldText,
                                            const Options& options) {
    if (!viewMatrix.hasPerspective()) {
        SkScalar maxScale = viewMatrix.getMaxScale();
        SkScalar scaledTextSize = maxScale * font.getSize();
        // Hinted text looks far better at small resolutions
        // Scaling up beyond 2x yields undesireable artifacts
        if (scaledTextSize < options.fMinDistanceFieldFontSize ||
            scaledTextSize > options.fMaxDistanceFieldFontSize) {
            return false;
        }

        bool useDFT = props.isUseDeviceIndependentFonts();
#if SK_FORCE_DISTANCE_FIELD_TEXT
        useDFT = true;
#endif

        if (!useDFT && scaledTextSize < kLargeDFFontSize) {
            return false;
        }
    }

    // mask filters modify alpha, which doesn't translate well to distance
    if (paint.getMaskFilter() || !contextSupportsDistanceFieldText) {
        return false;
    }

    // TODO: add some stroking support
    if (paint.getStyle() != SkPaint::kFill_Style) {
        return false;
    }

    return true;
}

    sk_sp<SkTextBlob> makeBlob(unsigned blobIndex) {
        SkTextBlobBuilder builder;

        SkFont font;
        font.setSubpixel(true);
        font.setEdging(SkFont::Edging::kAntiAlias);
        font.setTypeface(fTypeface);

        for (unsigned l = 0; l < SK_ARRAY_COUNT(blobConfigs[blobIndex]); ++l) {
            unsigned currentGlyph = 0;

            for (unsigned c = 0; c < SK_ARRAY_COUNT(blobConfigs[blobIndex][l]); ++c) {
                const BlobCfg* cfg = &blobConfigs[blobIndex][l][c];
                unsigned count = cfg->count;

                if (count > fGlyphs.count() - currentGlyph) {
                    count = fGlyphs.count() - currentGlyph;
                }
                if (0 == count) {
                    break;
                }

                font.setSize(kFontSize * cfg->scale);
                const SkScalar advanceX = font.getSize() * 0.85f;
                const SkScalar advanceY = font.getSize() * 1.5f;

                SkPoint offset = SkPoint::Make(currentGlyph * advanceX + c * advanceX,
                                               advanceY * l);
                switch (cfg->pos) {
                case kDefault_Pos: {
                    const SkTextBlobBuilder::RunBuffer& buf = builder.allocRun(font, count,
                                                                               offset.x(),
                                                                               offset.y());
                    memcpy(buf.glyphs, fGlyphs.begin() + currentGlyph, count * sizeof(uint16_t));
                } break;
                case kScalar_Pos: {
                    const SkTextBlobBuilder::RunBuffer& buf = builder.allocRunPosH(font, count,
                                                                                   offset.y());
                    SkTDArray<SkScalar> pos;
                    for (unsigned i = 0; i < count; ++i) {
                        *pos.append() = offset.x() + i * advanceX;
                    }

                    memcpy(buf.glyphs, fGlyphs.begin() + currentGlyph, count * sizeof(uint16_t));
                    memcpy(buf.pos, pos.begin(), count * sizeof(SkScalar));
                } break;
                case kPoint_Pos: {
                    const SkTextBlobBuilder::RunBuffer& buf = builder.allocRunPos(font, count);

                    SkTDArray<SkScalar> pos;
                    for (unsigned i = 0; i < count; ++i) {
                        *pos.append() = offset.x() + i * advanceX;
                        *pos.append() = offset.y() + i * (advanceY / count);
                    }

                    memcpy(buf.glyphs, fGlyphs.begin() + currentGlyph, count * sizeof(uint16_t));
                    memcpy(buf.pos, pos.begin(), count * sizeof(SkScalar) * 2);
                } break;
                default:
                    SK_ABORT("unhandled pos value");
                }

                currentGlyph += count;
            }
        }

        return builder.make();
    }