Today's gm include many differences caused by platform font implementations.

This experiment replaces the label used in the aaxfermodes gm with
aliased text generated from paths common to all platforms.

Since there is no way today to generate all dm output from trybots,
this will be checked in to confirm that this strategy provides simpler
output across devices.

This does not introduce a new public interface; instead, dm uses
a extern backdoor to install the SkTypeface::CreateFromName
handler.

Review URL: https://codereview.chromium.org/1163283002

1 files changed, 64 insertions, 28 deletions

diff --git a/gm/aaxfermodes.cpp b/gm/aaxfermodes.cpp
index 9970c4fd6d..750b4238fb 100644
--- a/gm/aaxfermodes.cpp
+++ b/gm/aaxfermodes.cpp
@@ -49,6 +49,12 @@ public:
     AAXfermodesGM() {}
 
 protected:
+    enum DrawingPass {
+        kCheckerboard_Pass,
+        kBackground_Pass,
+        kShape_Pass
+    };
+
     SkString onShortName() override {
         return SkString("aaxfermodes");
     }
@@ -61,8 +67,10 @@ protected:
     }
 
     void onOnceBeforeDraw() override {
+#if 0
         fLabelPaint.setAntiAlias(true);
-        sk_tool_utils::set_portable_typeface(&fLabelPaint);
+#endif
+        sk_tool_utils::set_portable_typeface_always(&fLabelPaint);
         fLabelPaint.setTextSize(5 * kShapeSize/8);
         fLabelPaint.setSubpixelText(true);
 
@@ -78,38 +86,29 @@ protected:
         fPath.quadTo(pts[3], pts[0]);
     }
 
-    void onDraw(SkCanvas* canvas) override {
-        sk_tool_utils::draw_checkerboard(canvas, 0xffffffff, 0xffc0c0c0, 10);
-
-        canvas->saveLayer(NULL, NULL);
-        canvas->drawColor(kBGColor, SkXfermode::kSrc_Mode);
-
-        canvas->translate(kMargin, kMargin);
-
-        SkPaint titlePaint(fLabelPaint);
-        titlePaint.setTextSize(9 * titlePaint.getTextSize() / 8);
-        titlePaint.setFakeBoldText(true);
-        titlePaint.setTextAlign(SkPaint::kCenter_Align);
-        canvas->drawText("Porter Duff", sizeof("Porter Duff") - 1,
-                         kLabelSpacing + 3 * kShapeTypeSpacing,
-                         kTitleSpacing / 2 + titlePaint.getTextSize() / 3, titlePaint);
-        canvas->drawText("Advanced", sizeof("Advanced") - 1,
-                         kXfermodeTypeSpacing + kLabelSpacing + 3 * kShapeTypeSpacing,
-                         kTitleSpacing / 2 + titlePaint.getTextSize() / 3, titlePaint);
+    void draw_pass(SkCanvas* canvas, DrawingPass drawingPass) {
+        SkRect clipRect =
+                { -kShapeSize*11/16, -kShapeSize*11/16, kShapeSize*11/16, kShapeSize*11/16 };
 
+        canvas->save();
+        if (kCheckerboard_Pass == drawingPass) {
+            canvas->translate(kMargin, kMargin);
+        }
         canvas->translate(0, kTitleSpacing);
 
         for (size_t xfermodeSet = 0; xfermodeSet < 2; xfermodeSet++) {
             size_t firstMode = (SkXfermode::kLastCoeffMode + 1) * xfermodeSet;
             canvas->save();
 
-            fLabelPaint.setTextAlign(SkPaint::kCenter_Align);
-            canvas->drawText("Src Unknown", sizeof("Src Unknown") - 1,
-                             kLabelSpacing + kShapeSpacing / 2 + kShapeTypeSpacing,
-                             kSubtitleSpacing / 2 + fLabelPaint.getTextSize() / 3, fLabelPaint);
-            canvas->drawText("Src Opaque", sizeof("Src Opaque") - 1,
-                             kLabelSpacing + kShapeSpacing / 2 + kShapeTypeSpacing + kPaintSpacing,
-                             kSubtitleSpacing / 2 + fLabelPaint.getTextSize() / 3, fLabelPaint);
+            if (kShape_Pass == drawingPass) {
+                fLabelPaint.setTextAlign(SkPaint::kCenter_Align);
+                canvas->drawText("Src Unknown", sizeof("Src Unknown") - 1,
+                        kLabelSpacing + kShapeSpacing / 2 + kShapeTypeSpacing,
+                        kSubtitleSpacing / 2 + fLabelPaint.getTextSize() / 3, fLabelPaint);
+                canvas->drawText("Src Opaque", sizeof("Src Opaque") - 1,
+                        kLabelSpacing + kShapeSpacing / 2 + kShapeTypeSpacing + kPaintSpacing,
+                        kSubtitleSpacing / 2 + fLabelPaint.getTextSize() / 3, fLabelPaint);
+            }
 
             canvas->translate(0, kSubtitleSpacing + kShapeSpacing/2);
 
@@ -117,7 +116,9 @@ protected:
                 SkXfermode::Mode mode = static_cast<SkXfermode::Mode>(firstMode + m);
                 canvas->save();
 
-                this->drawModeName(canvas, mode);
+                if (kShape_Pass == drawingPass) {
+                    this->drawModeName(canvas, mode);
+                }
                 canvas->translate(kLabelSpacing + kShapeSpacing/2, 0);
 
                 for (size_t colorIdx = 0; colorIdx < SK_ARRAY_COUNT(kShapeColors); colorIdx++) {
@@ -127,7 +128,20 @@ protected:
                     canvas->save();
 
                     for (size_t shapeIdx = 0; shapeIdx <= kLast_Shape; shapeIdx++) {
-                        this->drawShape(canvas, static_cast<Shape>(shapeIdx), paint, mode);
+                        if (kShape_Pass != drawingPass) {
+                            canvas->save();
+                            canvas->clipRect(clipRect);
+                            if (kCheckerboard_Pass == drawingPass) {
+                                sk_tool_utils::draw_checkerboard(canvas, 0xffffffff, 0xffc6c3c6,
+                                        10);
+                            } else {
+                                SkASSERT(kBackground_Pass == drawingPass);
+                                canvas->drawColor(kBGColor, SkXfermode::kSrc_Mode);
+                            }
+                            canvas->restore();
+                        } else {
+                            this->drawShape(canvas, static_cast<Shape>(shapeIdx), paint, mode);
+                        }
                         canvas->translate(kShapeTypeSpacing, 0);
                     }
 
@@ -146,6 +160,28 @@ protected:
         canvas->restore();
     }
 
+    void onDraw(SkCanvas* canvas) override {
+        draw_pass(canvas, kCheckerboard_Pass);
+        canvas->saveLayer(NULL, NULL);
+
+        canvas->translate(kMargin, kMargin);
+        draw_pass(canvas, kBackground_Pass);
+
+        SkPaint titlePaint(fLabelPaint);
+        titlePaint.setTextSize(9 * titlePaint.getTextSize() / 8);
+        titlePaint.setFakeBoldText(true);
+        titlePaint.setTextAlign(SkPaint::kCenter_Align);
+        canvas->drawText("Porter Duff", sizeof("Porter Duff") - 1,
+                         kLabelSpacing + 3 * kShapeTypeSpacing,
+                         kTitleSpacing / 2 + titlePaint.getTextSize() / 3, titlePaint);
+        canvas->drawText("Advanced", sizeof("Advanced") - 1,
+                         kXfermodeTypeSpacing + kLabelSpacing + 3 * kShapeTypeSpacing,
+                         kTitleSpacing / 2 + titlePaint.getTextSize() / 3, titlePaint);
+
+        draw_pass(canvas, kShape_Pass);
+        canvas->restore();
+    }
+
     void drawModeName(SkCanvas* canvas, SkXfermode::Mode mode) {
         const char* modeName = mode <= SkXfermode::kLastMode ? SkXfermode::ModeName(mode)
                                                              : "Arithmetic";