static void drawKernText(SkCanvas* canvas, const void* text, size_t len, SkScalar x, SkScalar y, const SkFont& font, const SkPaint& paint) { SkTypeface* face = font.getTypefaceOrDefault(); if (!face) { canvas->drawSimpleText(text, len, SkTextEncoding::kUTF8, x, y, font, paint); return; } SkAutoSTMalloc<128, uint16_t> glyphStorage(len); uint16_t* glyphs = glyphStorage.get(); int glyphCount = font.textToGlyphs(text, len, SkTextEncoding::kUTF8, glyphs, len); if (glyphCount < 1) { return; } SkAutoSTMalloc<128, int32_t> adjustmentStorage(glyphCount - 1); int32_t* adjustments = adjustmentStorage.get(); if (!face->getKerningPairAdjustments(glyphs, glyphCount, adjustments)) { canvas->drawSimpleText(text, len, SkTextEncoding::kUTF8, x, y, font, paint); return; } SkTextBlobBuilder builder; auto rec = builder.allocRunPos(font, glyphCount); memcpy(rec.glyphs, glyphs, glyphCount * sizeof(SkGlyphID)); getGlyphPositions(font, glyphs, glyphCount, x, y, rec.points()); applyKerning(rec.points(), adjustments, glyphCount, font); canvas->drawTextBlob(builder.make(), 0, 0, paint); }
// 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; } }