Clean up unflattening paints

Just removing legacy cruft for fonts, and also change to return by
value (cleaner).

Change-Id: If120931119c32542e06801da2b6d60ba84ba2186
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/437676
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>

src/core/SkPaint.cpp

@@ -322,48 +322,48 @@ void SkPaintPriv::Flatten(const SkPaint& paint, SkWriteBuffer& buffer) {
     }
 }
 
-SkReadPaintResult SkPaintPriv::Unflatten(SkPaint* paint, SkReadBuffer& buffer, SkFont* font) {
-    SkSafeRange safe;
+SkPaint SkPaintPriv::Unflatten(SkReadBuffer& buffer) {
+    SkPaint paint;
 
-    paint->setStrokeWidth(buffer.readScalar());
-    paint->setStrokeMiter(buffer.readScalar());
+    paint.setStrokeWidth(buffer.readScalar());
+    paint.setStrokeMiter(buffer.readScalar());
     {
         SkColor4f color;
         buffer.readColor4f(&color);
-        paint->setColor(color, sk_srgb_singleton());
+        paint.setColor(color, sk_srgb_singleton());
     }
 
-    unsigned flatFlags = unpack_v68(paint, buffer.readUInt(), safe);
+    SkSafeRange safe;
+    unsigned flatFlags = unpack_v68(&paint, buffer.readUInt(), safe);
 
     if (!(flatFlags & kHasEffects_FlatFlag)) {
         // This is a simple SkPaint without any effects, so clear all the effect-related fields.
-        paint->setPathEffect(nullptr);
-        paint->setShader(nullptr);
-        paint->setMaskFilter(nullptr);
-        paint->setColorFilter(nullptr);
-        paint->setImageFilter(nullptr);
+        paint.setPathEffect(nullptr);
+        paint.setShader(nullptr);
+        paint.setMaskFilter(nullptr);
+        paint.setColorFilter(nullptr);
+        paint.setImageFilter(nullptr);
     } else if (buffer.isVersionLT(SkPicturePriv::kSkBlenderInSkPaint)) {
         // This paint predates the introduction of user blend functions (via SkBlender).
-        paint->setPathEffect(buffer.readPathEffect());
-        paint->setShader(buffer.readShader());
-        paint->setMaskFilter(buffer.readMaskFilter());
-        paint->setColorFilter(buffer.readColorFilter());
+        paint.setPathEffect(buffer.readPathEffect());
+        paint.setShader(buffer.readShader());
+        paint.setMaskFilter(buffer.readMaskFilter());
+        paint.setColorFilter(buffer.readColorFilter());
         (void)buffer.read32();  // was drawLooper (now deprecated)
-        paint->setImageFilter(buffer.readImageFilter());
+        paint.setImageFilter(buffer.readImageFilter());
     } else {
-        paint->setPathEffect(buffer.readPathEffect());
-        paint->setShader(buffer.readShader());
-        paint->setMaskFilter(buffer.readMaskFilter());
-        paint->setColorFilter(buffer.readColorFilter());
-        paint->setImageFilter(buffer.readImageFilter());
-        paint->setBlender(buffer.readBlender());
+        paint.setPathEffect(buffer.readPathEffect());
+        paint.setShader(buffer.readShader());
+        paint.setMaskFilter(buffer.readMaskFilter());
+        paint.setColorFilter(buffer.readColorFilter());
+        paint.setImageFilter(buffer.readImageFilter());
+        paint.setBlender(buffer.readBlender());
     }
 
-    if (!buffer.validate(safe)) {
-        paint->reset();
-        return kFailed_ReadPaint;
+    if (!buffer.validate(safe.ok())) {
+        paint.reset();
     }
-    return kSuccess_JustPaint;
+    return paint;
 }
 
 ///////////////////////////////////////////////////////////////////////////////

src/core/SkPaintPriv.h

@@ -10,16 +10,9 @@
 
 #include "include/core/SkPaint.h"
 
-class SkFont;
 class SkReadBuffer;
 class SkWriteBuffer;
 
-enum SkReadPaintResult {
-    kFailed_ReadPaint,
-    kSuccess_JustPaint,
-    kSuccess_PaintAndFont,
-};
-
 class SkPaintPriv {
 public:
     enum ShaderOverrideOpacity {
@@ -54,18 +47,8 @@ public:
 
     /** Populates SkPaint, typically from a serialized stream, created by calling
         flatten() at an earlier time.
-
-        SkReadBuffer class is not public, so unflatten() cannot be meaningfully called
-        by the client.
-
-        Older formats also stored font info in the serialized data. On success, this
-        returns if it deserialized just a paint, or both a font and paint. The font
-        param is optional.
-
-        @param buffer  serialized data describing SkPaint content
-        @return        false if the buffer contains invalid data
     */
-    static SkReadPaintResult Unflatten(SkPaint* paint, SkReadBuffer& buffer, SkFont* font);
+    static SkPaint Unflatten(SkReadBuffer& buffer);
 
     // If this paint has any color filter, fold it into the shader and/or paint color
     // so that it draws the same but getColorFilter() returns nullptr.

src/core/SkPictureData.cpp

@@ -415,8 +415,8 @@ void SkPictureData::parseBufferTag(SkReadBuffer& buffer, uint32_t tag, uint32_t
             const int count = SkToInt(size);
 
             for (int i = 0; i < count; ++i) {
-                // Do we need to keep an array of fFonts for legacy draws?
-                if (!buffer.readPaint(&fPaints.push_back(), nullptr)) {
+                fPaints.push_back(buffer.readPaint());
+                if (!buffer.isValid()) {
                     return;
                 }
             }

src/core/SkReadBuffer.h

@@ -108,8 +108,8 @@ public:
 
     void readPath(SkPath* path);
 
-    SkReadPaintResult readPaint(SkPaint* paint, SkFont* font) {
-        return SkPaintPriv::Unflatten(paint, *this, font);
+    SkPaint readPaint() {
+        return SkPaintPriv::Unflatten(*this);
     }
 
     SkFlattenable* readFlattenable(SkFlattenable::Type);

src/core/SkTextBlobTrace.cpp

@@ -34,7 +34,7 @@ std::vector<SkTextBlobTrace::Record> SkTextBlobTrace::CreateBlobTrace(SkStream*
     while (!readBuffer.eof()) {
         SkTextBlobTrace::Record record;
         record.origUniqueID = readBuffer.readUInt();
-        readBuffer.readPaint(&record.paint, nullptr);
+        record.paint = readBuffer.readPaint();
         readBuffer.readPoint(&record.offset);
         record.blob = SkTextBlobPriv::MakeFromBuffer(readBuffer);
         trace.push_back(std::move(record));

src/effects/imagefilters/SkShaderImageFilter.cpp

@@ -66,9 +66,7 @@ void SkRegisterShaderImageFilterFlattenable() {
 
 sk_sp<SkFlattenable> SkShaderImageFilter::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 0);
-    SkPaint paint;
-    buffer.readPaint(&paint, nullptr);
-    return SkShaderImageFilter::Make(paint, common.cropRect());
+    return SkShaderImageFilter::Make(buffer.readPaint(), common.cropRect());
 }
 
 void SkShaderImageFilter::flatten(SkWriteBuffer& buffer) const {

tests/FlattenDrawableTest.cpp

@@ -71,9 +71,7 @@ public:
     }
 
     static sk_sp<SkFlattenable> CreateProc(SkReadBuffer& buffer) {
-        SkPaint paint;
-        buffer.readPaint(&paint, nullptr);
-        return sk_sp<PaintDrawable>(new PaintDrawable(paint));
+        return sk_sp<PaintDrawable>(new PaintDrawable(buffer.readPaint()));
     }
 
     Factory getFactory() const override { return CreateProc; }

tests/PaintTest.cpp

@@ -116,8 +116,7 @@ DEF_TEST(Paint_flattening, reporter) {
     writer.writeToMemory(buf.get());
     SkReadBuffer reader(buf.get(), writer.bytesWritten());
 
-    SkPaint paint2;
-    SkPaintPriv::Unflatten(&paint2, reader, nullptr);
+    SkPaint paint2 = reader.readPaint();
     REPORTER_ASSERT(reporter, paint2 == paint);
 
     }}}
@@ -153,8 +152,7 @@ DEF_TEST(Paint_MoreFlattening, r) {
     writer.writeToMemory(buf.get());
     SkReadBuffer reader(buf.get(), writer.bytesWritten());
 
-    SkPaint other;
-    SkPaintPriv::Unflatten(&other, reader, nullptr);
+    SkPaint other = reader.readPaint();
     ASSERT(reader.offset() == writer.bytesWritten());
 
     // No matter the encoding, these must always hold.