C++ SkPaint::getFontSpacing方法代码示例

    virtual void onDraw(SkCanvas* canvas) {
        SkPaint paint;
        SkScalar horizMargin(SkIntToScalar(10));
        SkScalar vertMargin(SkIntToScalar(10));

        SkBitmapDevice devTmp(SkBitmap::kARGB_8888_Config, 40, 40, false);
        SkCanvas canvasTmp(&devTmp);

        draw_checks(&canvasTmp, 40, 40);
        SkBitmap src = canvasTmp.getTopDevice()->accessBitmap(false);

        for (unsigned i = 0; i < NUM_CONFIGS; ++i) {
            if (!src.deepCopyTo(&fDst[i], gConfigs[i])) {
                src.copyTo(&fDst[i], gConfigs[i]);
            }
        }

        canvas->clear(0xFFDDDDDD);
        paint.setAntiAlias(true);
        SkScalar width = SkIntToScalar(40);
        SkScalar height = SkIntToScalar(40);
        if (paint.getFontSpacing() > height) {
            height = paint.getFontSpacing();
        }
        for (unsigned i = 0; i < NUM_CONFIGS; i++) {
            const char* name = gConfigNames[src.config()];
            SkScalar textWidth = paint.measureText(name, strlen(name));
            if (textWidth > width) {
                width = textWidth;
            }
        }
        SkScalar horizOffset = width + horizMargin;
        SkScalar vertOffset = height + vertMargin;
        canvas->translate(SkIntToScalar(20), SkIntToScalar(20));

        for (unsigned i = 0; i < NUM_CONFIGS; i++) {
            canvas->save();
            // Draw destination config name
            const char* name = gConfigNames[fDst[i].config()];
            SkScalar textWidth = paint.measureText(name, strlen(name));
            SkScalar x = (width - textWidth) / SkScalar(2);
            SkScalar y = paint.getFontSpacing() / SkScalar(2);
            canvas->drawText(name, strlen(name), x, y, paint);

            // Draw destination bitmap
            canvas->translate(0, vertOffset);
            x = (width - 40) / SkScalar(2);
            canvas->drawBitmap(fDst[i], x, 0, &paint);
            canvas->restore();

            canvas->translate(horizOffset, 0);
        }
    }

    virtual void onDraw(SkCanvas* canvas) {
        SkPaint paint;
        SkScalar horizMargin = 10;
        SkScalar vertMargin = 10;

        SkBitmap src;
        src.allocN32Pixels(40, 40);
        SkCanvas canvasTmp(src);

        draw_checks(&canvasTmp, 40, 40);

        for (unsigned i = 0; i < NUM_CONFIGS; ++i) {
            src.copyTo(&fDst[i], gColorTypes[i]);
        }

        canvas->clear(0xFFDDDDDD);
        paint.setAntiAlias(true);
        sk_tool_utils::set_portable_typeface(&paint);
        
        SkScalar width = SkIntToScalar(40);
        SkScalar height = SkIntToScalar(40);
        if (paint.getFontSpacing() > height) {
            height = paint.getFontSpacing();
        }
        for (unsigned i = 0; i < NUM_CONFIGS; i++) {
            const char* name = gColorTypeNames[src.colorType()];
            SkScalar textWidth = paint.measureText(name, strlen(name));
            if (textWidth > width) {
                width = textWidth;
            }
        }
        SkScalar horizOffset = width + horizMargin;
        SkScalar vertOffset = height + vertMargin;
        canvas->translate(SkIntToScalar(20), SkIntToScalar(20));

        for (unsigned i = 0; i < NUM_CONFIGS; i++) {
            canvas->save();
            // Draw destination config name
            const char* name = gColorTypeNames[fDst[i].colorType()];
            SkScalar textWidth = paint.measureText(name, strlen(name));
            SkScalar x = (width - textWidth) / SkScalar(2);
            SkScalar y = paint.getFontSpacing() / SkScalar(2);
            canvas->drawText(name, strlen(name), x, y, paint);

            // Draw destination bitmap
            canvas->translate(0, vertOffset);
            x = (width - 40) / SkScalar(2);
            canvas->drawBitmap(fDst[i], x, 0, &paint);
            canvas->restore();

            canvas->translate(horizOffset, 0);
        }
    }

    void onDrawContent(SkCanvas* canvas) override {
        SkPaint paint;
        SkSafeUnref(paint.setTypeface(SkTypeface::CreateFromFile("/skimages/samplefont.ttf")));
        paint.setAntiAlias(true);
        paint.setFilterQuality(kMedium_SkFilterQuality);

        SkString outString("fps: ");
        fTimer.end();

        // TODO: generalize this timing code in utils
        fTimes[fCurrentTime] = (float)(fTimer.fWall);
        fCurrentTime = (fCurrentTime + 1) & 0x1f;

        float meanTime = 0.0f;
        for (int i = 0; i < 32; ++i) {
            meanTime += fTimes[i];
        }
        meanTime /= 32.f;
        SkScalar fps = 1000.f / meanTime;
        outString.appendScalar(fps);
        outString.append(" ms: ");
        outString.appendScalar(meanTime);

        SkString modeString("Text scale: ");
        modeString.appendU32(fSizeScale);
        modeString.append("x");

        fTimer.start();

        canvas->save();

#if SK_SUPPORT_GPU
        SkBaseDevice* device = canvas->getDevice_just_for_deprecated_compatibility_testing();
        GrContext* grContext = canvas->getGrContext();
        if (grContext) {
            GrTexture* tex = grContext->getFontAtlasTexture(GrMaskFormat::kA8_GrMaskFormat);
            reinterpret_cast<SkGpuDevice*>(device)->drawTexture(tex,
                                                       SkRect::MakeXYWH(512, 10, 512, 512), paint);
        }
#endif
        canvas->translate(180, 180);
        canvas->rotate(fRotation);
        canvas->scale(fScale, fScale);
        canvas->translate(-180, -180);

        const char* text = "Hamburgefons";
        size_t length = strlen(text);

        SkScalar y = SkIntToScalar(0);
        for (int i = 12; i <= 26; i++) {
            paint.setTextSize(SkIntToScalar(i*fSizeScale));
            y += paint.getFontSpacing();
            DrawTheText(canvas, text, length, SkIntToScalar(110), y, paint);
        }
        canvas->restore();

        paint.setTextSize(16);
//        canvas->drawText(outString.c_str(), outString.size(), 512.f, 540.f, paint);
        canvas->drawText(modeString.c_str(), modeString.size(), 768.f, 540.f, paint);
    }

    void onDraw(SkCanvas* canvas) override {
        canvas->save();

        SkPaint     paint;
        paint.setAntiAlias(true);
        sk_tool_utils::set_portable_typeface(&paint);
        paint.setTextSize(SkIntToScalar(56));

        SkScalar    x = SkIntToScalar(20);
        SkScalar    y = paint.getTextSize();

        SkString str("Hamburgefons");

        for (int i = 0; i < static_cast<int>(SK_ARRAY_COUNT(gRastProcs)); i++) {
            apply_shader(&paint, i);

            //  paint.setMaskFilter(NULL);
            //  paint.setColor(SK_ColorBLACK);

            canvas->drawText(str.c_str(), str.size(), x, y, paint);

            y += paint.getFontSpacing();
        }

        canvas->restore();
    }

static void test_text(SkCanvas* canvas, SkScalar size,
                      SkColor color, SkScalar Y) {
    SkPaint type;
    type.setTextSize(24);
    sk_tool_utils::set_portable_typeface(&type);
    type.setColor(color);
    const char text[] = "HELLO WORLD";
    canvas->drawText(text, strlen(text), 32, size / 2 + Y, type);
    SkScalar lineSpacing = type.getFontSpacing();
    exercise_draw_pos_text(canvas, text, 32, size / 2 + Y + lineSpacing, type);
    exercise_draw_pos_text_h(canvas, text, 32,
                             size / 2 + Y + 2 * lineSpacing, type);
}

JNIEXPORT void JNICALL Java_com_example_HelloSkiaActivity_drawIntoBitmap(JNIEnv* env,
        jobject thiz, jobject dstBitmap, jlong elapsedTime)
{
    // Grab the dst bitmap info and pixels
    AndroidBitmapInfo dstInfo;
    void* dstPixels;
    AndroidBitmap_getInfo(env, dstBitmap, &dstInfo);
    AndroidBitmap_lockPixels(env, dstBitmap, &dstPixels);

    SkImageInfo info = SkImageInfo::MakeN32Premul(dstInfo.width, dstInfo.height);

    // Create a surface from the given bitmap
    SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterDirect(info, dstPixels, dstInfo.stride));
    SkCanvas* canvas = surface->getCanvas();

    // Draw something "interesting"

    // Clear the canvas with a white color
    canvas->drawColor(SK_ColorWHITE);

    // Setup a SkPaint for drawing our text
    SkPaint paint;
    paint.setColor(SK_ColorBLACK); // This is a solid black color for our text
    paint.setTextSize(SkIntToScalar(30)); // Sets the text size to 30 pixels
    paint.setAntiAlias(true); // We turn on anti-aliasing so that the text to looks good.

    // Draw some text
    SkString text("Skia is Best!");
    SkScalar fontHeight = paint.getFontSpacing();
    canvas->drawText(text.c_str(), text.size(), // text's data and length
                     10, fontHeight,            // X and Y coordinates to place the text
                     paint);                    // SkPaint to tell how to draw the text

    // Adapt the SkPaint for drawing blue lines
    paint.setAntiAlias(false); // Turning off anti-aliasing speeds up the line drawing
    paint.setColor(0xFF0000FF); // This is a solid blue color for our lines
    paint.setStrokeWidth(SkIntToScalar(2)); // This makes the lines have a thickness of 2 pixels

    // Draw some interesting lines using trig functions
    for (int i = 0; i < 100; i++)
    {
        float x = (float)i / 99.0f;
        float offset = elapsedTime / 1000.0f;
        canvas->drawLine(sin(x * M_PI + offset) * 800.0f, 0,   // first endpoint
                         cos(x * M_PI + offset) * 800.0f, 800, // second endpoint
                         paint);                               // SkPapint to tell how to draw the line
    }

    // Unlock the dst's pixels
    AndroidBitmap_unlockPixels(env, dstBitmap);
}

    virtual void onDrawContent(SkCanvas* canvas) {
        SkAutoCanvasRestore restore(canvas, false);
        {
            SkRect r;
            r.set(0, 0, SkIntToScalar(1000), SkIntToScalar(20));
       //     canvas->saveLayer(&r, NULL, SkCanvas::kHasAlphaLayer_SaveFlag);
        }

        SkPaint paint;
//        const uint16_t glyphs[] = { 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19 };
        int         index = fHints % SK_ARRAY_COUNT(gHints);
        index = 1;
//        const char* style = gHints[index].fName;

//        canvas->translate(0, SkIntToScalar(50));

  //      canvas->drawText(style, strlen(style), SkIntToScalar(20), SkIntToScalar(20), paint);

        SkSafeUnref(paint.setTypeface(SkTypeface::CreateFromFile("/skimages/samplefont.ttf")));
        paint.setAntiAlias(true);
        paint.setFlags(paint.getFlags() | gHints[index].fFlags);

        SkRect clip;
        clip.set(SkIntToScalar(25), SkIntToScalar(34), SkIntToScalar(88), SkIntToScalar(155));

        const char* text = "Hamburgefons";
        size_t length = strlen(text);

        SkScalar y = SkIntToScalar(0);
        for (int i = 9; i <= 24; i++) {
            paint.setTextSize(SkIntToScalar(i) /*+ (gRand.nextU() & 0xFFFF)*/);
            for (SkScalar dx = 0; dx <= SkIntToScalar(3)/4;
                                            dx += SkIntToScalar(1) /* /4 */) {
                y += paint.getFontSpacing();
                DrawTheText(canvas, text, length, SkIntToScalar(20) + dx, y,
                            paint, fClickX, fMF);
            }
        }
        if (gHints[index].fFlushCache) {
//                SkGraphics::SetFontCacheUsed(0);
        }
    }

    void drawTest(SkCanvas* canvas, SkScalar w, SkScalar h, SkColor fg, SkColor bg) {
        SkAutoCanvasRestore acr(canvas, true);

        canvas->clipRect(SkRect::MakeWH(w, h));
        canvas->drawColor(bg);
        SkScalar margin = 20;
        SkTextBox tbox;
        tbox.setMode(SkTextBox::kLineBreak_Mode);
        tbox.setBox(margin, margin,
                    w - margin, h - margin);
        tbox.setSpacing(SkIntToScalar(3)/3, 0);

        SkPaint paint;
        paint.setAntiAlias(true);
        paint.setLCDRenderText(true);
        paint.setColor(fg);
        tbox.setText(gText, strlen(gText), paint);

        for (int i = 9; i < 24; i += 2) {
            paint.setTextSize(SkIntToScalar(i));
            tbox.draw(canvas);
            canvas->translate(0, tbox.getTextHeight() + paint.getFontSpacing());
        }
    }