1 files changed, 77 insertions, 0 deletions
diff --git a/experimental/sksg/geometry/SkSGText.cpp b/experimental/sksg/geometry/SkSGText.cpp
new file mode 100644
index 0000000000..c149390023
--- /dev/null
+++ b/experimental/sksg/geometry/SkSGText.cpp
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2018 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkSGText.h"
+
+#include "SkCanvas.h"
+#include "SkPaint.h"
+#include "SkPath.h"
+#include "SkTArray.h"
+#include "SkTextBlob.h"
+#include "SkTypeface.h"
+
+namespace sksg {
+
+sk_sp<Text> Text::Make(sk_sp<SkTypeface> tf, const SkString& text) {
+    return sk_sp<Text>(new Text(std::move(tf), text));
+}
+
+Text::Text(sk_sp<SkTypeface> tf, const SkString& text)
+    : fTypeface(std::move(tf))
+    , fText(text) {}
+
+Text::~Text() = default;
+
+SkRect Text::onRevalidate(InvalidationController*, const SkMatrix&) {
+    // TODO: we could potentially track invals which don't require rebuilding the blob.
+
+    SkPaint font;
+    font.setFlags(fFlags);
+    font.setTypeface(fTypeface);
+    font.setTextSize(fSize);
+    font.setTextScaleX(fScaleX);
+    font.setTextSkewX(fSkewX);
+    font.setTextAlign(fAlign);
+    font.setHinting(fHinting);
+
+    // First, convert to glyphIDs.
+    font.setTextEncoding(SkPaint::kUTF8_TextEncoding);
+    SkSTArray<256, SkGlyphID, true> glyphs;
+    glyphs.reset(font.textToGlyphs(fText.c_str(), fText.size(), nullptr));
+    SkAssertResult(font.textToGlyphs(fText.c_str(), fText.size(), glyphs.begin()) == glyphs.count());
+    font.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
+
+    // Next, build the cached blob.
+    SkTextBlobBuilder builder;
+    const auto& buf = builder.allocRun(font, glyphs.count(), 0, 0, nullptr);
+    if (!buf.glyphs) {
+        fBlob.reset();
+        return SkRect::MakeEmpty();
+    }
+
+    memcpy(buf.glyphs, glyphs.begin(), glyphs.count() * sizeof(SkGlyphID));
+
+    fBlob = builder.make();
+    return fBlob
+        ? fBlob->bounds().makeOffset(fPosition.x(), fPosition.y())
+        : SkRect::MakeEmpty();
+}
+
+void Text::onDraw(SkCanvas* canvas, const SkPaint& paint) const {
+    canvas->drawTextBlob(fBlob, fPosition.x(), fPosition.y(), paint);
+}
+
+SkPath Text::onAsPath() const {
+    // TODO
+    return SkPath();
+}
+
+void Text::onClip(SkCanvas* canvas, bool antiAlias) const {
+    canvas->clipPath(this->asPath(), antiAlias);
+}
+
+} // namespace sksg