Generate Signed Distance Field directly from vector path

Add SkGenerateDistanceFieldFromPath API to generate signed distance field directly from SkPath.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1643143002

Committed: https://skia.googlesource.com/skia/+/4de97a64e8829323a7070b623411d9f9ddb0cd0f
Committed: https://skia.googlesource.com/skia/+/e8f0a7b986f1e5583c9bc162efcdd92fd6430549
Committed: https://skia.googlesource.com/skia/+/67c7c81a82b6351e9fbbf235084d7120162d9268
Review-Url: https://codereview.chromium.org/1643143002

1 files changed, 41 insertions, 18 deletions

diff --git a/src/gpu/text/GrAtlasGlyphCache.cpp b/src/gpu/text/GrAtlasGlyphCache.cpp
index 803dbb48e1..b466ca88d2 100644
--- a/src/gpu/text/GrAtlasGlyphCache.cpp
+++ b/src/gpu/text/GrAtlasGlyphCache.cpp
@@ -14,6 +14,7 @@
 #include "SkString.h"
 
 #include "SkDistanceFieldGen.h"
+#include "GrDistanceFieldGenFromVector.h"
 
 bool GrAtlasGlyphCache::initAtlas(GrMaskFormat format) {
     int index = MaskFormatToAtlasIndex(format);
@@ -320,29 +321,51 @@ static bool get_packed_glyph_df_image(SkGlyphCache* cache, const SkGlyph& glyph,
                                       int width, int height, void* dst) {
     SkASSERT(glyph.fWidth + 2*SK_DistanceFieldPad == width);
     SkASSERT(glyph.fHeight + 2*SK_DistanceFieldPad == height);
-    const void* image = cache->findImage(glyph);
-    if (nullptr == image) {
+
+#ifndef SK_USE_LEGACY_DISTANCE_FIELDS
+    const SkPath* path = cache->findPath(glyph);
+    if (nullptr == path) {
         return false;
     }
+
     // now generate the distance field
     SkASSERT(dst);
-    SkMask::Format maskFormat = static_cast<SkMask::Format>(glyph.fMaskFormat);
-    if (SkMask::kA8_Format == maskFormat) {
-        // make the distance field from the image
-        SkGenerateDistanceFieldFromA8Image((unsigned char*)dst,
-                                           (unsigned char*)image,
-                                           glyph.fWidth, glyph.fHeight,
-                                           glyph.rowBytes());
-    } else if (SkMask::kBW_Format == maskFormat) {
-        // make the distance field from the image
-        SkGenerateDistanceFieldFromBWImage((unsigned char*)dst,
-                                           (unsigned char*)image,
-                                           glyph.fWidth, glyph.fHeight,
-                                           glyph.rowBytes());
-    } else {
-        return false;
-    }
+    SkMatrix drawMatrix;
+    drawMatrix.setTranslate((SkScalar)-glyph.fLeft, (SkScalar)-glyph.fTop);
+
+    // Generate signed distance field directly from SkPath
+    bool succeed = GrGenerateDistanceFieldFromPath((unsigned char*)dst,
+                                           *path, drawMatrix,
+                                           width, height, width * sizeof(unsigned char));
+
+    if (!succeed) {
+#endif
+        const void* image = cache->findImage(glyph);
+        if (nullptr == image) {
+            return false;
+        }
 
+        // now generate the distance field
+        SkASSERT(dst);
+        SkMask::Format maskFormat = static_cast<SkMask::Format>(glyph.fMaskFormat);
+        if (SkMask::kA8_Format == maskFormat) {
+            // make the distance field from the image
+            SkGenerateDistanceFieldFromA8Image((unsigned char*)dst,
+                                               (unsigned char*)image,
+                                               glyph.fWidth, glyph.fHeight,
+                                               glyph.rowBytes());
+        } else if (SkMask::kBW_Format == maskFormat) {
+            // make the distance field from the image
+            SkGenerateDistanceFieldFromBWImage((unsigned char*)dst,
+                                               (unsigned char*)image,
+                                               glyph.fWidth, glyph.fHeight,
+                                               glyph.rowBytes());
+        } else {
+            return false;
+        }
+#ifndef SK_USE_LEGACY_DISTANCE_FIELDS
+    }
+#endif
     return true;
 }