gm/textblobblockreordering.cpp

   1 /*
   2  * Copyright 2016 Google Inc.
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7
   8 #include "gm.h"
   9 #include "sk_tool_utils.h"
  10
  11 #include "SkCanvas.h"
  12 #include "SkTextBlob.h"
  13
  14 namespace skiagm {
  15 class TextBlobBlockReordering : public GM {
  16 public:
  17     // This gm tests that textblobs translate properly when their draw order is different from their
  18     // flush order
  19     TextBlobBlockReordering() { }
  20
  21 protected:
  22     void onOnceBeforeDraw() override {
  23         SkTextBlobBuilder builder;
  24
  25         // make textblob
  26         // Large text is used to trigger atlas eviction
  27         SkPaint paint;
  28         paint.setTextSize(56);
  29         const char* text = "AB";
  30         sk_tool_utils::set_portable_typeface(&paint);
  31
  32         SkRect bounds;
  33         paint.measureText(text, strlen(text), &bounds);
  34
  35         SkScalar yOffset = bounds.height();
  36         sk_tool_utils::add_to_text_blob(&builder, text, paint, 0, yOffset - 30);
  37
  38         // build
  39         fBlob = builder.make();
  40     }
  41
  42     SkString onShortName() override {
  43         return SkString("textblobblockreordering");
  44     }
  45
  46     SkISize onISize() override {
  47         return SkISize::Make(kWidth, kHeight);
  48     }
  49
  50     // This draws the same text blob 3 times.  The second draw used a different xfer mode so its
  51     // GrDrawOp doesn't get combined with the first and third. Ultimately, they will be flushed in
  52     // the order first, third, and then second.
  53     void onDraw(SkCanvas* canvas) override {
  54         canvas->drawColor(sk_tool_utils::color_to_565(SK_ColorGRAY));
  55
  56         SkPaint paint;
  57         canvas->translate(10, 40);
  58
  59         SkRect bounds = fBlob->bounds();
  60         const int yDelta = SkScalarFloorToInt(bounds.height()) + 20;
  61         const int xDelta = SkScalarFloorToInt(bounds.width());
  62
  63         canvas->drawTextBlob(fBlob, 0, 0, paint);
  64
  65         canvas->translate(SkIntToScalar(xDelta), SkIntToScalar(yDelta));
  66
  67         // Draw a rect where the text should be, and then twiddle the xfermode so we don't combine.
  68         SkPaint redPaint;
  69         redPaint.setColor(SK_ColorRED);
  70         canvas->drawRect(bounds, redPaint);
  71         SkPaint srcInPaint(paint);
  72         srcInPaint.setBlendMode(SkBlendMode::kSrcIn);
  73         canvas->drawTextBlob(fBlob, 0, 0, srcInPaint);
  74
  75         canvas->translate(SkIntToScalar(xDelta), SkIntToScalar(yDelta));
  76         canvas->drawTextBlob(fBlob, 0, 0, paint);
  77     }
  78
  79 private:
  80     sk_sp<SkTextBlob> fBlob;
  81
  82     static constexpr int kWidth = 275;
  83     static constexpr int kHeight = 200;
  84
  85     typedef GM INHERITED;
  86 };
  87
  88 //////////////////////////////////////////////////////////////////////////////
  89
  90 DEF_GM(return new TextBlobBlockReordering;)
  91 }