Create new GM to target translations problems in GrAtlasTextContext

gm/textblobblockreordering.cpp

+/*

[robertphillips, 2016/02/24 13:03:14]

2016 ?

+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "gm.h"
+

[robertphillips, 2016/02/24 13:03:14]

Do we need Resources.h & SkTypeface.h ?

+#include "Resources.h"
+#include "SkCanvas.h"
+#include "SkTextBlob.h"
+#include "SkTypeface.h"
+
+namespace skiagm {
+class TextBlobBlockReordering : public GM {
+public:
+    // This gm tests that textblobs translate properly when their draw order is different from their
+    // flush order
+    TextBlobBlockReordering() { }
+
+protected:
+    void onOnceBeforeDraw() override {
+        SkTextBlobBuilder builder;
+
+        // make textblob
+        // Large text is used to trigger atlas eviction
+        SkPaint paint;
+        paint.setTextSize(56);
+        const char* text = "AB";
+        sk_tool_utils::set_portable_typeface(&paint);
+
+        SkRect bounds;
+        paint.measureText(text, strlen(text), &bounds);
+
+        SkScalar yOffset = bounds.height();
+        sk_tool_utils::add_to_text_blob(&builder, text, paint, 0, yOffset - 30);
+
+        // build
+        fBlob.reset(builder.build());
+    }
+
+    SkString onShortName() override {
+        return SkString("textblobblockreordering");
+    }
+
+    SkISize onISize() override {
+        return SkISize::Make(kWidth, kHeight);
+    }
+

[robertphillips, 2016/02/24 13:03:14]

// This draws the same text blob 3 times. The second draw uses a different xfer
mode so it doesn't get batched with the first and third. Ultimately they will be
flushed in the order first, third and then second.

+    void onDraw(SkCanvas* canvas) override {
+        canvas->drawColor(sk_tool_utils::color_to_565(SK_ColorGRAY));
+
+        SkPaint paint;
+        canvas->translate(10, 40);
+
+        SkRect bounds = fBlob->bounds();
+        const int yDelta = SkScalarFloorToInt(bounds.height()) + 20;
+        const int xDelta = SkScalarFloorToInt(bounds.width());
+        
+        canvas->drawTextBlob(fBlob, 0, 0, paint);
+        
+        canvas->translate(SkIntToScalar(xDelta), SkIntToScalar(yDelta));
+
+        // draw a rect where the text should be, and then twiddle the xfermode
+        // so we don't batch
+        SkPaint redPaint;
+        redPaint.setColor(SK_ColorRED);
+        canvas->drawRect(bounds, redPaint);
+        SkPaint srcInPaint(paint);
+        srcInPaint.setXfermodeMode(SkXfermode::kSrcIn_Mode);
+        canvas->drawTextBlob(fBlob, 0, 0, srcInPaint);
+
+        canvas->translate(SkIntToScalar(xDelta), SkIntToScalar(yDelta));
+        canvas->drawTextBlob(fBlob, 0, 0, paint);
+    }
+
+private:
+    SkAutoTUnref<const SkTextBlob> fBlob;
+
+    static const int kWidth = 675;
+    static const int kHeight = 1600;
+
+    typedef GM INHERITED;
+};
+ 
+//////////////////////////////////////////////////////////////////////////////
+
+DEF_GM(return new TextBlobBlockReordering;)
+}