C++ SkTextBlobBuilder::build方法代码示例

PassTextBlobPtr Font::buildTextBlob(const GlyphBuffer& glyphBuffer, float initialAdvance, const FloatRect& bounds) const
{
    SkTextBlobBuilder builder;
    SkScalar advance = SkFloatToScalar(initialAdvance);

    bool success = glyphBuffer.hasOffsets() ?
        buildTextBlobInternal<true>(glyphBuffer, advance, builder) :
        buildTextBlobInternal<false>(glyphBuffer, advance, builder);
    return success ? adoptRef(builder.build()) : nullptr;
}

    void WriteLine(const SkShaper& shaper, const char *text, size_t textBytes) {
        if (!pageCanvas || current_y > config->page_height.value) {
            if (pageCanvas) {
                document->endPage();
            }
            pageCanvas = document->beginPage(config->page_width.value,
                                             config->page_height.value);
            pageCanvas->drawPaint(white_paint);
            current_x = config->left_margin.value;
            current_y = config->line_spacing_ratio.value * config->font_size.value;
        }
        SkTextBlobBuilder textBlobBuilder;
        shaper.shape(&textBlobBuilder, glyph_paint, text, textBytes, SkPoint{0, 0});
        sk_sp<const SkTextBlob> blob(textBlobBuilder.build());
        pageCanvas->drawTextBlob(blob.get(), current_x, current_y, glyph_paint);

        // Advance to the next line.
        current_y += config->line_spacing_ratio.value * config->font_size.value;
    }

    void onDelayedSetup() override {
        fTypeface.reset(sk_tool_utils::create_portable_typeface("serif", SkTypeface::kNormal));
        // make textblob
        SkPaint paint;
        paint.setTypeface(fTypeface);
        const char* text = "Hello blob!";
        SkTDArray<uint16_t> glyphs;
        size_t len = strlen(text);
        glyphs.append(paint.textToGlyphs(text, len, nullptr));
        paint.textToGlyphs(text, len, glyphs.begin());

        SkTextBlobBuilder builder;

        paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
        const SkTextBlobBuilder::RunBuffer& run = builder.allocRun(paint, glyphs.count(), 10, 10,
                                                                   nullptr);
        memcpy(run.glyphs, glyphs.begin(), glyphs.count() * sizeof(uint16_t));

        fBlob.reset(builder.build());
    }

// This test hammers the GPU textblobcache and font atlas
static void text_blob_cache_inner(skiatest::Reporter* reporter, GrContext* context,
                                  int maxTotalText, int maxGlyphID, int maxFamilies, bool normal,
                                  bool stressTest) {
    // setup surface
    uint32_t flags = 0;
    SkSurfaceProps props(flags, SkSurfaceProps::kLegacyFontHost_InitType);

    // configure our context for maximum stressing of cache and atlas
    if (stressTest) {
        GrTest::SetupAlwaysEvictAtlas(context);
        context->setTextBlobCacheLimit_ForTesting(0);
    }

    SkImageInfo info = SkImageInfo::Make(kWidth, kHeight, kN32_SkColorType, kPremul_SkAlphaType);
    auto surface(SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, info, 0, &props));
    REPORTER_ASSERT(reporter, surface);
    if (!surface) {
        return;
    }

    SkCanvas* canvas = surface->getCanvas();

    SkAutoTUnref<SkFontMgr> fm(SkFontMgr::RefDefault());

    int count = SkMin32(fm->countFamilies(), maxFamilies);

    // make a ton of text
    SkAutoTArray<uint16_t> text(maxTotalText);
    for (int i = 0; i < maxTotalText; i++) {
        text[i] = i % maxGlyphID;
    }

    // generate textblobs
    SkTArray<TextBlobWrapper> blobs;
    for (int i = 0; i < count; i++) {
        SkPaint paint;
        paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
        paint.setTextSize(48); // draw big glyphs to really stress the atlas

        SkString familyName;
        fm->getFamilyName(i, &familyName);
        SkAutoTUnref<SkFontStyleSet> set(fm->createStyleSet(i));
        for (int j = 0; j < set->count(); ++j) {
            SkFontStyle fs;
            set->getStyle(j, &fs, nullptr);

            // We use a typeface which randomy returns unexpected mask formats to fuzz
            SkAutoTUnref<SkTypeface> orig(set->createTypeface(j));
            if (normal) {
                paint.setTypeface(orig);
            } else {
                SkAutoTUnref<SkTypeface> typeface(new SkRandomTypeface(orig, paint, true));
                paint.setTypeface(typeface);
            }

            SkTextBlobBuilder builder;
            for (int aa = 0; aa < 2; aa++) {
                for (int subpixel = 0; subpixel < 2; subpixel++) {
                    for (int lcd = 0; lcd < 2; lcd++) {
                        paint.setAntiAlias(SkToBool(aa));
                        paint.setSubpixelText(SkToBool(subpixel));
                        paint.setLCDRenderText(SkToBool(lcd));
                        if (!SkToBool(lcd)) {
                            paint.setTextSize(160);
                        }
                        const SkTextBlobBuilder::RunBuffer& run = builder.allocRun(paint,
                                                                                   maxTotalText,
                                                                                   0, 0,
                                                                                   nullptr);
                        memcpy(run.glyphs, text.get(), maxTotalText * sizeof(uint16_t));
                    }
                }
            }
            blobs.emplace_back(builder.build());
        }
    }

    // create surface where LCD is impossible
    info = SkImageInfo::MakeN32Premul(kWidth, kHeight);
    SkSurfaceProps propsNoLCD(0, kUnknown_SkPixelGeometry);
    auto surfaceNoLCD(canvas->makeSurface(info, &propsNoLCD));
    REPORTER_ASSERT(reporter, surface);
    if (!surface) {
        return;
    }

    SkCanvas* canvasNoLCD = surfaceNoLCD->getCanvas();

    // test redraw
    draw(canvas, 2, blobs);
    draw(canvasNoLCD, 2, blobs);

    // test draw after free
    context->freeGpuResources();
    draw(canvas, 1, blobs);

    context->freeGpuResources();
    draw(canvasNoLCD, 1, blobs);

//.........这里部分代码省略.........

    const SkTextBlob* makeBlob(unsigned blobIndex) {
        SkTextBlobBuilder builder;

        SkPaint font;
        font.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
        font.setAntiAlias(true);
        font.setSubpixelText(true);
        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.setTextSize(kFontSize * cfg->scale);
                const SkScalar advanceX = font.getTextSize() * 0.85f;
                const SkScalar advanceY = font.getTextSize() * 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.build();
    }

    void onOnceBeforeDraw() override {
        SkTextBlobBuilder builder;

        // LCD
        SkPaint paint;
        paint.setTextSize(32);
        const char* text = "The quick brown fox jumps over the lazy dog";
        paint.setSubpixelText(true);
        paint.setLCDRenderText(true);
        paint.setAntiAlias(true);
        sk_tool_utils::set_portable_typeface(&paint);
        add_to_text_blob(&builder, text, paint, 0, 0);
        fBlob.reset(builder.build());

        // create a looper which sandwhiches an effect in two normal draws
        LooperSettings looperSandwhich[] = {
           { SkXfermode::kSrc_Mode, SK_ColorMAGENTA, SkPaint::kFill_Style, 0, 0, 0, false },
           { SkXfermode::kSrcOver_Mode, 0x88000000, SkPaint::kFill_Style, 0, 10.f, 0, true },
           { SkXfermode::kSrcOver_Mode, 0x50FF00FF, SkPaint::kFill_Style, 0, 20.f, 0, false },
        };

        LooperSettings compound[] = {
            { SkXfermode::kSrc_Mode, SK_ColorWHITE, SkPaint::kStroke_Style, 1.f * 3/4, 0, 0, false },
            { SkXfermode::kSrc_Mode, SK_ColorRED, SkPaint::kStroke_Style, 4.f, 0, 0, false },
            { SkXfermode::kSrc_Mode, SK_ColorBLUE, SkPaint::kFill_Style, 0, 0, 0, false },
            { SkXfermode::kSrcOver_Mode, 0x88000000, SkPaint::kFill_Style, 0, 10.f, 0, true }
        };

        LooperSettings xfermode[] = {
            { SkXfermode::kDifference_Mode, SK_ColorWHITE, SkPaint::kFill_Style, 0, 0, 0, false },
            { SkXfermode::kSrcOver_Mode, 0xFF000000, SkPaint::kFill_Style, 0, 1.f, 0, true },
            { SkXfermode::kSrcOver_Mode, 0x50FF00FF, SkPaint::kFill_Style, 0, 2.f, 0, false },
        };

        // NOTE, this should be ignored by textblobs
        LooperSettings skew[] = {
            { SkXfermode::kSrc_Mode, SK_ColorRED, SkPaint::kFill_Style, 0, 0, -1.f, false },
            { SkXfermode::kSrc_Mode, SK_ColorGREEN, SkPaint::kFill_Style, 0, 10.f, -1.f, false },
            { SkXfermode::kSrc_Mode, SK_ColorBLUE, SkPaint::kFill_Style, 0, 20.f, -1.f, false },
        };

        LooperSettings kitchenSink[] = {
            { SkXfermode::kSrc_Mode, SK_ColorWHITE, SkPaint::kStroke_Style, 1.f * 3/4, 0, 0, false },
            { SkXfermode::kSrc_Mode, SK_ColorBLACK, SkPaint::kFill_Style, 0, 0, 0, false },
            { SkXfermode::kDifference_Mode, SK_ColorWHITE, SkPaint::kFill_Style, 1.f, 10.f, 0, false },
            { SkXfermode::kSrc_Mode, SK_ColorWHITE, SkPaint::kFill_Style, 0, 10.f, 0, true },
            { SkXfermode::kSrcOver_Mode, 0x50FF00FF, SkPaint::kFill_Style, 0, 20.f, 0, false },
        };

        fLoopers.push_back(setupLooper(SkLayerDrawLooper::kMaskFilter_Bit |
                                       SkLayerDrawLooper::kXfermode_Bit |
                                       SkLayerDrawLooper::kStyle_Bit, &mask_filter,
                                       compound, SK_ARRAY_COUNT(compound)));
        fLoopers.push_back(setupLooper(SkLayerDrawLooper::kPathEffect_Bit |
                                       SkLayerDrawLooper::kXfermode_Bit, &path_effect,
                                       looperSandwhich, SK_ARRAY_COUNT(looperSandwhich)));
        fLoopers.push_back(setupLooper(SkLayerDrawLooper::kShader_Bit |
                                       SkLayerDrawLooper::kColorFilter_Bit |
                                       SkLayerDrawLooper::kXfermode_Bit, &color_filter,
                                       looperSandwhich, SK_ARRAY_COUNT(looperSandwhich)));
        fLoopers.push_back(setupLooper(SkLayerDrawLooper::kShader_Bit |
                                       SkLayerDrawLooper::kColorFilter_Bit |
                                       SkLayerDrawLooper::kXfermode_Bit, &color_filter,
                                       xfermode, SK_ARRAY_COUNT(xfermode)));
        fLoopers.push_back(setupLooper(0, nullptr, skew, SK_ARRAY_COUNT(skew)));
        fLoopers.push_back(setupLooper(SkLayerDrawLooper::kMaskFilter_Bit |
                                       SkLayerDrawLooper::kShader_Bit |
                                       SkLayerDrawLooper::kColorFilter_Bit |
                                       SkLayerDrawLooper::kPathEffect_Bit |
                                       SkLayerDrawLooper::kStyle_Bit |
                                       SkLayerDrawLooper::kXfermode_Bit, &kitchen_sink,
                                       kitchenSink, SK_ARRAY_COUNT(kitchenSink)));

        // Test we respect overrides
        fLoopers.push_back(setupLooper(0, &kitchen_sink,
                                       kitchenSink, SK_ARRAY_COUNT(kitchenSink)));
    }