MakeAsDrawText for SkTextBlob

Change-Id: I04ebca6b318e0654cc1e598aa323cfb9a21e5a5e
Reviewed-on: https://skia-review.googlesource.com/141960
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Cary Clark <caryclark@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Herb Derby <herb@google.com>

3 files changed, 29 insertions, 1 deletions

diff --git a/src/core/SkGlyphRun.cpp b/src/core/SkGlyphRun.cpp
index 549dce8ee8..3548dfa203 100644
--- a/src/core/SkGlyphRun.cpp
+++ b/src/core/SkGlyphRun.cpp
@@ -68,6 +68,11 @@ void SkGlyphRun::temporaryShuntToCallback(TemporaryShuntCallback callback) {
     callback(fTemporaryShuntGlyphIDs.size(), bytes, pos);
 }
 
+void SkGlyphRun::filloutGlyphsAndPositions(SkGlyphID* glyphIDs, SkPoint* positions) {
+    memcpy(glyphIDs, fTemporaryShuntGlyphIDs.data(), fTemporaryShuntGlyphIDs.size_bytes());
+    memcpy(positions, fPositions.data(), fPositions.size_bytes());
+}
+
 // -- SkGlyphRunList -------------------------------------------------------------------------------
 SkGlyphRunList::SkGlyphRunList(
         const SkPaint& paint,
diff --git a/src/core/SkGlyphRun.h b/src/core/SkGlyphRun.h
index c220a26424..001c3c4548 100644
--- a/src/core/SkGlyphRun.h
+++ b/src/core/SkGlyphRun.h
@@ -37,6 +37,7 @@ public:
     T* data() const { return fPtr; }
     size_t size() const { return fSize; }
     bool empty() const { return fSize == 0; }
+    size_t size_bytes() const { return fSize * sizeof(T); }
 
 private:
     T* fPtr;
@@ -59,8 +60,9 @@ public:
     void temporaryShuntToDrawPosText(SkBaseDevice* device, SkPoint origin);
     using TemporaryShuntCallback = std::function<void(size_t, const char*, const SkScalar*)>;
     void temporaryShuntToCallback(TemporaryShuntCallback callback);
+    void filloutGlyphsAndPositions(SkGlyphID* glyphIDs, SkPoint* positions);
 
-    size_t runSize() const { return fUniqueGlyphIDIndices.size(); }
+    size_t runSize() const { return fTemporaryShuntGlyphIDs.size(); }
     SkSpan<const SkPoint> positions() const { return fPositions; }
     const SkPaint& paint() const { return fRunPaint; }
 
diff --git a/src/core/SkTextBlob.cpp b/src/core/SkTextBlob.cpp
index dd2f7bd1dd..fec7c527a2 100644
--- a/src/core/SkTextBlob.cpp
+++ b/src/core/SkTextBlob.cpp
@@ -7,6 +7,7 @@
 
 #include "SkTextBlobRunIterator.h"
 
+#include "SkGlyphRun.h"
 #include "SkPaintPriv.h"
 #include "SkReadBuffer.h"
 #include "SkSafeMath.h"
@@ -886,6 +887,26 @@ sk_sp<SkTextBlob> SkTextBlobPriv::MakeFromBuffer(SkReadBuffer& reader) {
     return blobBuilder.make();
 }
 
+sk_sp<SkTextBlob> SkTextBlob::MakeAsDrawText(
+        const void* text, size_t byteLength, const SkPaint& paint) {
+    SkGlyphRunBuilder runBuilder;
+
+    runBuilder.drawText(paint, text, byteLength, SkPoint::Make(0, 0));
+
+    auto list = runBuilder.useGlyphRunList();
+    SkTextBlobBuilder blobBuilder;
+    if (!list->empty()) {
+        auto run = (*list)[0];
+        SkPaint blobPaint(paint);
+        blobPaint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
+
+        auto runData = blobBuilder.allocRunPos(blobPaint, run.runSize());
+        run.filloutGlyphsAndPositions(runData.glyphs, (SkPoint *)runData.pos);
+    }
+
+    return blobBuilder.make();
+}
+
 sk_sp<SkData> SkTextBlob::serialize(const SkSerialProcs& procs) const {
     SkBinaryWriteBuffer buffer;
     buffer.setSerialProcs(procs);