Add mixedtextblob gm and a simple bench

gm/mixedtextblobs.cpp

Index: gm/mixedtextblobs.cpp
diff --git a/gm/mixedtextblobs.cpp b/gm/mixedtextblobs.cpp
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+++ b/gm/mixedtextblobs.cpp
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+/*
+ * Copyright 2013 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"
+
+#include "Resources.h"
+#include "SkCanvas.h"
+#include "SkGradientShader.h"
+#include "SkStream.h"
+#include "SkTextBlob.h"
+#include "SkTypeface.h"
+
+namespace skiagm {
+
+static void add_to_text_blob(SkTextBlobBuilder* builder, const char* text, const SkPaint& origPaint,
+                             SkScalar x, SkScalar y) {
+    SkPaint paint(origPaint);
+    SkTDArray<uint16_t> glyphs;
+
+    size_t len = strlen(text);
+    glyphs.append(paint.textToGlyphs(text, len, NULL));
+    paint.textToGlyphs(text, len, glyphs.begin());
+
+    paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
+    const SkTextBlobBuilder::RunBuffer& run = builder->allocRun(paint, glyphs.count(), x, y,
+                                                                NULL);
+    memcpy(run.glyphs, glyphs.begin(), glyphs.count() * sizeof(uint16_t));
+}
+
+static void draw_blob(SkCanvas* canvas, const SkTextBlob* blob, const SkPaint& skPaint,
+                      const SkRect& clipRect) {
+    SkPaint clipHairline;
+    clipHairline.setColor(SK_ColorWHITE);
+    clipHairline.setStyle(SkPaint::kStroke_Style);
+
+    SkPaint paint(skPaint);
+    canvas->save();
+    canvas->drawRect(clipRect, clipHairline);
+    paint.setAlpha(0x20);
+    canvas->drawTextBlob(blob, 0, 0, paint);
+    canvas->clipRect(clipRect);
+    paint.setAlpha(0xFF);
+    canvas->drawTextBlob(blob, 0, 0, paint);
+    canvas->restore();
+}
+
+class MixedTextBlobsGM : public GM {
+public:
+    MixedTextBlobsGM() { }
+
+protected:
+    void onOnceBeforeDraw() override {
+        SkAutoTDelete<SkFILEStream> stream;
+        SkString filename;
+#ifndef SK_BUILD_FOR_MAC
+        filename = GetResourcePath("/Funkster.ttf");
+        stream.reset(new SkFILEStream(filename.c_str()));
+        if (stream->isValid()) {
+            fEmojiTypeface.reset(SkTypeface::CreateFromStream(stream.detach()));
+        } else {
+            SkDebugf("Could not find Funkster.ttf, please set --resourcePath correctly.\n");
+        }
+        fEmojiText = "Emoji!!!";
+#else
+        fEmojiTypeface.reset(SkTypeface::CreateFromName("Apple Color Emoji", SkTypeface::kNormal));
+        fEmojiText = "\xF0\x9F\x92\xB0" "\xF0\x9F\x8F\xA1" "\xF0\x9F\x8E\x85" // 💰🏡🎅
+                     "\xF0\x9F\x8D\xAA" "\xF0\x9F\x8D\x95" "\xF0\x9F\x9A\x80"; // 🍪🍕🚀
+#endif
+
+        filename = GetResourcePath("/ReallyBigA.ttf");
+
+        stream.reset(new SkFILEStream(filename.c_str()));
+        if (stream->isValid()) {
+            fReallyBigATypeface.reset(SkTypeface::CreateFromStream(stream.detach()));
+        }
+
+        SkTextBlobBuilder builder;
+
+        // make textblob
+        // Text so large we draw as paths
+        SkPaint paint;
+        paint.setTextSize(384);
+        const char* text = "O";
+        sk_tool_utils::set_portable_typeface(&paint);
+
+        SkRect bounds;
+        paint.measureText(text, strlen(text), &bounds);
+
+        SkScalar yOffset = bounds.height();
+        add_to_text_blob(&builder, text, paint, 10, yOffset);
+        SkScalar corruptedAx = bounds.width();
+        SkScalar corruptedAy = yOffset;
+
+        const SkScalar boundsHalfWidth = bounds.width() * SK_ScalarHalf;
+        const SkScalar boundsHalfHeight = bounds.height() * SK_ScalarHalf;
+
+        SkScalar xOffset = boundsHalfWidth;
+        yOffset = boundsHalfHeight;
+
+        // LCD
+        paint.setTextSize(32);
+        text = "LCD!!!!!";
+        paint.setSubpixelText(true);
+        paint.setLCDRenderText(true);
+        paint.measureText(text, strlen(text), &bounds);
+        add_to_text_blob(&builder, text, paint, xOffset - bounds.width() * 0.25f,
+                                                yOffset - bounds.height() * 0.5f);
+        yOffset += bounds.height();
+
+        // color emoji
+        paint.setSubpixelText(false);
+        paint.setLCDRenderText(false);
+        paint.setTypeface(fEmojiTypeface);
+        text = fEmojiText;
+        paint.measureText(text, strlen(text), &bounds);
+        add_to_text_blob(&builder, text, paint, xOffset - bounds.width() * 0.3f, yOffset);
+
+        // Corrupted font
+        paint.setTextSize(12);
+        text = "aA";
+        paint.setTypeface(fReallyBigATypeface);
+        add_to_text_blob(&builder, text, paint, corruptedAx, corruptedAy);
+        fBlob.reset(builder.build());
+    }
+
+    SkString onShortName() override {
+        return SkString("mixedtextblobs");
+    }
+
+    SkISize onISize() override {
+        return SkISize::Make(kWidth, kHeight);
+    }
+
+    void onDraw(SkCanvas* canvas) override {
+
+        canvas->drawColor(SK_ColorGRAY);
+
+        SkPaint paint;
+
+        // setup work needed to draw text with different clips
+        paint.setColor(SK_ColorBLACK);
+        canvas->translate(10, 40);
+
+        paint.setTextSize(40);
+
+        // compute the bounds of the text and setup some clips
+        SkRect bounds = fBlob->bounds();
+
+        const SkScalar boundsHalfWidth = bounds.width() * SK_ScalarHalf;
+        const SkScalar boundsHalfHeight = bounds.height() * SK_ScalarHalf;
+        const SkScalar boundsQuarterWidth = boundsHalfWidth * SK_ScalarHalf;
+        const SkScalar boundsQuarterHeight = boundsHalfHeight * SK_ScalarHalf;
+
+        SkRect upperLeftClip = SkRect::MakeXYWH(bounds.left(), bounds.top(),
+                                                boundsHalfWidth, boundsHalfHeight);
+        SkRect lowerRightClip = SkRect::MakeXYWH(bounds.centerX(), bounds.centerY(),
+                                                 boundsHalfWidth, boundsHalfHeight);
+        SkRect interiorClip = bounds;
+        interiorClip.inset(boundsQuarterWidth, boundsQuarterHeight);
+
+        const SkRect clipRects[] = { bounds, upperLeftClip, lowerRightClip, interiorClip};
+
+        size_t count = sizeof(clipRects) / sizeof(SkRect);
+        for (size_t x = 0; x < count; ++x) {
+            draw_blob(canvas, fBlob, paint, clipRects[x]);
+            if (x == (count >> 1) - 1) {
+                canvas->translate(SkScalarFloorToScalar(bounds.width() + SkIntToScalar(25)),
+                                  -(x * SkScalarFloorToScalar(bounds.height() +
+                                    SkIntToScalar(25))));
+            } else {
+                canvas->translate(0, SkScalarFloorToScalar(bounds.height() + SkIntToScalar(25)));
+            }
+        }
+    }
+
+private:
+    SkAutoTUnref<SkTypeface> fEmojiTypeface;
+    SkAutoTUnref<SkTypeface> fReallyBigATypeface;
+    const char* fEmojiText;
+    SkAutoTUnref<const SkTextBlob> fBlob;
+
+    static const int kWidth = 1250;
+    static const int kHeight = 700;
+
+    typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+DEF_GM( return SkNEW(MixedTextBlobsGM); )
+}