Various fixes for scaled emojis

Bug: skia:7562
Change-Id: I66cf290ca4541ceae7ee1009a1524046a2c5893e
Reviewed-on: https://skia-review.googlesource.com/111481
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/gm/scaledemoji.cpp b/gm/scaledemoji.cpp
index c4a4c34499..ac8b3c6d51 100644
--- a/gm/scaledemoji.cpp
+++ b/gm/scaledemoji.cpp
@@ -61,11 +61,75 @@ protected:
 
     }
 
+private:
+    typedef GM INHERITED;
+};
+
+class ScaledEmojiPosGM : public GM {
+public:
+    ScaledEmojiPosGM() {}
+
+protected:
+    struct EmojiFont {
+        sk_sp<SkTypeface> fTypeface;
+        const char* fText;
+    } fEmojiFont;
+
+    void onOnceBeforeDraw() override {
+        fEmojiFont.fTypeface = sk_tool_utils::emoji_typeface();
+        fEmojiFont.fText = sk_tool_utils::emoji_sample_text();
+    }
+
+    SkString onShortName() override {
+        SkString name("scaledemojipos");
+        name.append(sk_tool_utils::platform_font_manager());
+        return name;
+    }
+
+    SkISize onISize() override { return SkISize::Make(1200, 1200); }
+
+    void onDraw(SkCanvas* canvas) override {
+
+        canvas->drawColor(sk_tool_utils::color_to_565(SK_ColorGRAY));
+
+        SkPaint paint;
+        paint.setTypeface(fEmojiFont.fTypeface);
+        const char* text = fEmojiFont.fText;
+
+        // draw text at different point sizes
+        // Testing GPU bitmap path, SDF path with no scaling,
+        // SDF path with scaling, path rendering with scaling
+        SkPaint::FontMetrics metrics;
+        SkScalar y = 0;
+        for (SkScalar textSize : { 70, 180, 270, 340 }) {
+            paint.setTextSize(textSize);
+            paint.getFontMetrics(&metrics);
+            y += -metrics.fAscent;
+
+            int len = SkToInt(strlen(text));
+            SkAutoTArray<SkPoint>  pos(len);
+            SkAutoTArray<SkScalar> widths(len);
+            paint.getTextWidths(text, len, &widths[0]);
+
+            SkScalar x = SkIntToScalar(10);
+            for (int i = 0; i < len; ++i) {
+                pos[i].set(x, y);
+                x += widths[i];
+            }
+
+            canvas->drawPosText(text, len, &pos[0], paint);
+            y += metrics.fDescent + metrics.fLeading;
+        }
+
+    }
+
+private:
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM(return new ScaledEmojiGM;)
+DEF_GM(return new ScaledEmojiPosGM;)
 
 }