C++ SkPaint::isVerticalText方法代码示例

    static void drawBaseline(SkCanvas* canvas, const SkPaint& paint,
                             SkScalar x, SkScalar y) {
        SkScalar total = paint.measureText(gText, gLen);

        SkPaint p;
        p.setAntiAlias(true);
        p.setColor(0x80FF0000);
        canvas->drawLine(x, y,
                         paint.isVerticalText() ? x : x + total,
                         paint.isVerticalText() ? y + total : y,
                         p);

        p.setColor(0xFF0000FF);
        SkScalar adv[gLen];
        int numChars = paint.getTextWidths(gText, gLen, adv, nullptr);
        for (int i = 0; i < numChars; ++i) {
            canvas->drawCircle(x, y, SK_Scalar1 * 3 / 2, p);
            if (paint.isVerticalText()) {
                y += adv[i];
            } else {
                x += adv[i];
            }
        }
        canvas->drawCircle(x, y, SK_Scalar1 * 3 / 2, p);
    }

void SkPictureRecord::drawPosTextH(const void* text, size_t byteLength,
                          const SkScalar xpos[], SkScalar constY,
                          const SkPaint& paint) {
    size_t points = paint.countText(text, byteLength);
    if (0 == points)
        return;

    bool fast = !paint.isVerticalText() && paint.canComputeFastBounds();

    addDraw(fast ? DRAW_POS_TEXT_H_TOP_BOTTOM : DRAW_POS_TEXT_H);
    int paintIndex = this->addPaint(paint);
    addText(text, byteLength);
    addInt(points);

#ifdef SK_DEBUG_SIZE
    size_t start = fWriter.size();
#endif
    if (fast) {
        addFontMetricsTopBottom(paint, paintIndex - 1, constY, constY);
    }
    addScalar(constY);
    fWriter.writeMul4(xpos, points * sizeof(SkScalar));
#ifdef SK_DEBUG_SIZE
    fPointBytes += fWriter.size() - start;
    fPointWrites += points;
#endif
    validate();
}

sk_sp<SkFont> SkFont::Testing_CreateFromPaint(const SkPaint& paint) {
    uint32_t flags = 0;
    if (paint.isVerticalText()) {
        flags |= kVertical_Flag;
    }
    if (paint.isEmbeddedBitmapText()) {
        flags |= kEmbeddedBitmaps_Flag;
    }
    if (paint.getFlags() & SkPaint::kGenA8FromLCD_Flag) {
        flags |= kGenA8FromLCD_Flag;
    }
    if (paint.isFakeBoldText()) {
        flags |= kEmbolden_Flag;
    }

    if (SkPaint::kFull_Hinting == paint.getHinting()) {
        flags |= kEnableByteCodeHints_Flag;
    }
    if (paint.isAutohinted()) {
        flags |= kEnableAutoHints_Flag;
    }
    if (paint.isSubpixelText() || paint.isLinearText()) {
        // this is our default
    } else {
        flags |= kUseNonlinearMetrics_Flag;
    }

    MaskType maskType = SkFont::kBW_MaskType;
    if (paint.isAntiAlias()) {
        maskType = paint.isLCDRenderText() ? kLCD_MaskType : kA8_MaskType;
    }

    return Make(sk_ref_sp(paint.getTypeface()), paint.getTextSize(), paint.getTextScaleX(),
                paint.getTextSkewX(), maskType, flags);
}

void SkPictureRecord::drawText(const void* text, size_t byteLength, SkScalar x,
                      SkScalar y, const SkPaint& paint) {
    bool fast = !paint.isVerticalText() && paint.canComputeFastBounds();

    addDraw(fast ? DRAW_TEXT_TOP_BOTTOM : DRAW_TEXT);
    int paintIndex = addPaint(paint);
    addText(text, byteLength);
    addScalar(x);
    addScalar(y);
    if (fast) {
        addFontMetricsTopBottom(paint, paintIndex - 1, y, y);
    }
    validate();
}

void SkBBoxRecord::onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
                              const SkPaint& paint) {
    SkRect bbox;
    paint.measureText(text, byteLength, &bbox);
    SkPaint::FontMetrics metrics;
    paint.getFontMetrics(&metrics);

    // Vertical and aligned text need to be offset
    if (paint.isVerticalText()) {
        SkScalar h = bbox.fBottom - bbox.fTop;
        if (paint.getTextAlign() == SkPaint::kCenter_Align) {
            bbox.fTop    -= h / 2;
            bbox.fBottom -= h / 2;
        }
        // Pad top and bottom with max extents from FontMetrics
        bbox.fBottom += metrics.fBottom;
        bbox.fTop += metrics.fTop;
    } else {
        SkScalar w = bbox.fRight - bbox.fLeft;
        if (paint.getTextAlign() == SkPaint::kCenter_Align) {
            bbox.fLeft  -= w / 2;
            bbox.fRight -= w / 2;
        } else if (paint.getTextAlign() == SkPaint::kRight_Align) {
            bbox.fLeft  -= w;
            bbox.fRight -= w;
        }
        // Set vertical bounds to max extents from font metrics
        bbox.fTop = metrics.fTop;
        bbox.fBottom = metrics.fBottom;
    }

    // Pad horizontal bounds on each side by half of max vertical extents (this is sort of
    // arbitrary, but seems to produce reasonable results, if there were a way of getting max
    // glyph X-extents to pad by, that may be better here, but FontMetrics fXMin and fXMax seem
    // incorrect on most platforms (too small in Linux, never even set in Windows).
    SkScalar pad = (metrics.fBottom - metrics.fTop) / 2;
    bbox.fLeft  -= pad;
    bbox.fRight += pad;

    bbox.fLeft += x;
    bbox.fRight += x;
    bbox.fTop += y;
    bbox.fBottom += y;
    if (this->transformBounds(bbox, &paint)) {
        INHERITED::onDrawText(text, byteLength, x, y, paint);
    }
}

static void test_cachedfont(skiatest::Reporter* reporter, const SkPaint& paint) {
    SkAutoTUnref<SkFont> font(SkFont::Testing_CreateFromPaint(paint));

    // Currently SkFont resolves null into the default, so only test if paint's is not null
    if (paint.getTypeface()) {
        REPORTER_ASSERT(reporter, font->getTypeface() == paint.getTypeface());
    }
    REPORTER_ASSERT(reporter, font->getSize() == paint.getTextSize());
    REPORTER_ASSERT(reporter, font->getScaleX() == paint.getTextScaleX());
    REPORTER_ASSERT(reporter, font->getSkewX() == paint.getTextSkewX());

    REPORTER_ASSERT(reporter, font->isVertical() == paint.isVerticalText());
    REPORTER_ASSERT(reporter, font->isEmbolden() == paint.isFakeBoldText());

    REPORTER_ASSERT(reporter, font->isUseNonLinearMetrics() == is_use_nonlinear_metrics(paint));
    REPORTER_ASSERT(reporter, font->isEnableAutoHints() == is_enable_auto_hints(paint));
    REPORTER_ASSERT(reporter, font->isEnableByteCodeHints() == is_enable_bytecode_hints(paint));
}

String LoggingCanvas::stringForSkPaintFlags(const SkPaint& paint)
{
    if (!paint.getFlags())
        return "none";
    String flagsString = "";
    appendFlagToString(&flagsString, paint.isAntiAlias(), "AntiAlias");
    appendFlagToString(&flagsString, paint.isDither(), "Dither");
    appendFlagToString(&flagsString, paint.isUnderlineText(), "UnderlinText");
    appendFlagToString(&flagsString, paint.isStrikeThruText(), "StrikeThruText");
    appendFlagToString(&flagsString, paint.isFakeBoldText(), "FakeBoldText");
    appendFlagToString(&flagsString, paint.isLinearText(), "LinearText");
    appendFlagToString(&flagsString, paint.isSubpixelText(), "SubpixelText");
    appendFlagToString(&flagsString, paint.isDevKernText(), "DevKernText");
    appendFlagToString(&flagsString, paint.isLCDRenderText(), "LCDRenderText");
    appendFlagToString(&flagsString, paint.isEmbeddedBitmapText(), "EmbeddedBitmapText");
    appendFlagToString(&flagsString, paint.isAutohinted(), "Autohinted");
    appendFlagToString(&flagsString, paint.isVerticalText(), "VerticalText");
    appendFlagToString(&flagsString, paint.getFlags() & SkPaint::kGenA8FromLCD_Flag, "GenA8FromLCD");
    return flagsString;
}

void SkPictureRecord::drawPosText(const void* text, size_t byteLength,
                         const SkPoint pos[], const SkPaint& paint) {
    size_t points = paint.countText(text, byteLength);
    if (0 == points)
        return;

    bool canUseDrawH = true;
    SkScalar minY = pos[0].fY;
    SkScalar maxY = pos[0].fY;
    // check if the caller really should have used drawPosTextH()
    {
        const SkScalar firstY = pos[0].fY;
        for (size_t index = 1; index < points; index++) {
            if (pos[index].fY != firstY) {
                canUseDrawH = false;
                if (pos[index].fY < minY) {
                    minY = pos[index].fY;
                } else if (pos[index].fY > maxY) {
                    maxY = pos[index].fY;
                }
            }
        }
    }

    bool fastBounds = !paint.isVerticalText() && paint.canComputeFastBounds();
    bool fast = canUseDrawH && fastBounds;

    if (fast) {
        addDraw(DRAW_POS_TEXT_H_TOP_BOTTOM);
    } else if (canUseDrawH) {
        addDraw(DRAW_POS_TEXT_H);
    } else if (fastBounds) {
        addDraw(DRAW_POS_TEXT_TOP_BOTTOM);
    } else {
        addDraw(DRAW_POS_TEXT);
    }
    int paintIndex = addPaint(paint);
    addText(text, byteLength);
    addInt(points);

#ifdef SK_DEBUG_SIZE
    size_t start = fWriter.size();
#endif
    if (canUseDrawH) {
        if (fast) {
            addFontMetricsTopBottom(paint, paintIndex - 1, pos[0].fY, pos[0].fY);
        }
        addScalar(pos[0].fY);
        SkScalar* xptr = (SkScalar*)fWriter.reserve(points * sizeof(SkScalar));
        for (size_t index = 0; index < points; index++)
            *xptr++ = pos[index].fX;
    }
    else {
        fWriter.writeMul4(pos, points * sizeof(SkPoint));
        if (fastBounds) {
            addFontMetricsTopBottom(paint, paintIndex - 1, minY, maxY);
        }
    }
#ifdef SK_DEBUG_SIZE
    fPointBytes += fWriter.size() - start;
    fPointWrites += points;
#endif
    validate();
}