GM/bench for text draws with various parameters and clip rects.

gm/variedtext.cpp

+/*
+ * Copyright 2014 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 "SkCanvas.h"
+#include "SkPath.h"
+#include "SkTypeface.h"
+#include "SkRandom.h"
+
+/**
+ * Draws text with random parameters. The text draws each get their own clip rect. It is also
+ * used as a bench to measure how well the GPU backend batches text draws.
+ */
+
+class VariedTextGM : public skiagm::GM {
+public:
+    VariedTextGM(bool effectiveClip, bool lcd)
+        : fEffectiveClip(effectiveClip)
+        , fLCD(lcd) {
+        memset(fTypefacesToUnref, 0, sizeof(fTypefacesToUnref));
+    }
+
+    ~VariedTextGM() {
+        for (size_t i = 0; i < SK_ARRAY_COUNT(fTypefacesToUnref); ++i) {
+            SkSafeUnref(fTypefacesToUnref[i]);
+        }
+    }
+
+protected:
+    virtual SkString onShortName() SK_OVERRIDE {
+        SkString name("varied_text");
+        if (fEffectiveClip) {
+            name.append("_clipped");
+        } else {
+            name.append("_ignorable_clip");
+        }
+        if (fLCD) {
+            name.append("_lcd");
+        } else {
+            name.append("_no_lcd");
+        }
+        return name;
+    }
+
+    virtual SkISize onISize() SK_OVERRIDE {
+        return SkISize::Make(640, 480);
+    }
+
+    virtual void onOnceBeforeDraw() SK_OVERRIDE {
+        fPaint.setAntiAlias(true);
+        fPaint.setLCDRenderText(fLCD);
+
+        SkISize size = this->getISize();
+        SkScalar w = SkIntToScalar(size.fWidth);
+        SkScalar h = SkIntToScalar(size.fHeight);
+
+        SK_COMPILE_ASSERT(4 == SK_ARRAY_COUNT(fTypefacesToUnref), typeface_cnt);
+        fTypefacesToUnref[0] = SkTypeface::CreateFromName("sans-serif", SkTypeface::kNormal);
+        fTypefacesToUnref[1] = SkTypeface::CreateFromName("sans-serif", SkTypeface::kBold);
+        fTypefacesToUnref[2] = SkTypeface::CreateFromName("serif", SkTypeface::kNormal);
+        fTypefacesToUnref[3] = SkTypeface::CreateFromName("serif", SkTypeface::kBold);
+
+        SkRandom random;
+        for (int i = 0; i < kCnt; ++i) {
+            int length = random.nextRangeU(kMinLength, kMaxLength);
+            char text[kMaxLength];
+            for (int j = 0; j < length; ++j) {
+                text[j] = (char)random.nextRangeU('!', 'z');
+            }
+            fStrings[i].set(text, length);
+
+            fColors[i] = random.nextU();
+            fColors[i] |= 0xFF000000;
+
+            static const SkScalar kMinPtSize = 8.f;
+            static const SkScalar kMaxPtSize = 32.f;
+
+            fPtSizes[i] = random.nextRangeScalar(kMinPtSize, kMaxPtSize);
+
+            fTypefaces[i] = fTypefacesToUnref[
+                random.nextULessThan(SK_ARRAY_COUNT(fTypefacesToUnref))];
+
+            SkRect r;
+            fPaint.setColor(fColors[i]);
+            fPaint.setTypeface(fTypefaces[i]);
+            fPaint.setTextSize(fPtSizes[i]);
+
+            fPaint.measureText(fStrings[i].c_str(), fStrings[i].size(), &r);
+            // safeRect is set of x,y positions where we can draw the string without hitting
+            // the GM's border.
+            SkRect safeRect = SkRect::MakeLTRB(-r.fLeft, -r.fTop, w - r.fRight, h - r.fBottom);
+            if (safeRect.isEmpty()) {
+                // If we don't fit then just don't worry about how we get cliped to the device
+                // border.
+                safeRect = SkRect::MakeWH(w, h);
+            }
+            fPositions[i].fX = random.nextRangeScalar(safeRect.fLeft, safeRect.fRight);
+            fPositions[i].fY = random.nextRangeScalar(safeRect.fTop, safeRect.fBottom);
+
+            fClipRects[i] = r;
+            fClipRects[i].offset(fPositions[i].fX, fPositions[i].fY);
+            fClipRects[i].outset(2.f, 2.f);
+
+            if (fEffectiveClip) {
+                fClipRects[i].fRight -= 0.25f * fClipRects[i].width();
+            }
+        }
+    }
+
+    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+        for (int i = 0; i < kCnt; ++i) {
+            fPaint.setColor(fColors[i]);
+            fPaint.setTextSize(fPtSizes[i]);
+            fPaint.setTypeface(fTypefaces[i]);
+
+            canvas->save();
+                canvas->clipRect(fClipRects[i]);
+                canvas->translate(fPositions[i].fX, fPositions[i].fY);
+                canvas->drawText(fStrings[i].c_str(), fStrings[i].size(), 0, 0, fPaint);
+            canvas->restore();
+        }
+
+        // Visualize the clips, but not in bench mode.
+        if (kBench_Mode != this->getMode()) {
+            SkPaint wirePaint;
+            wirePaint.setAntiAlias(true);
+            wirePaint.setStrokeWidth(0);
+            wirePaint.setStyle(SkPaint::kStroke_Style);
+            for (int i = 0; i < kCnt; ++i) {
+                canvas->drawRect(fClipRects[i], wirePaint);
+            }
+        }
+    }
+
+    virtual uint32_t onGetFlags() const SK_OVERRIDE {
+        // The aa hairline stroked rects used to visualize the clip draw slightly differently in
+        // quilt mode in dm.
+        return kAsBench_Flag | kSkipTiled_Flag;
+    }
+
+private:
+    static const int kCnt = 30;
+    static const int kMinLength = 15;
+    static const int kMaxLength = 40;
+
+    bool        fEffectiveClip;
+    bool        fLCD;
+    SkTypeface* fTypefacesToUnref[4];
+    SkPaint     fPaint;
+
+    // precomputed for each text draw
+    SkString        fStrings[kCnt];
+    SkColor         fColors[kCnt];
+    SkScalar        fPtSizes[kCnt];
+    SkTypeface*     fTypefaces[kCnt];
+    SkPoint         fPositions[kCnt];
+    SkRect          fClipRects[kCnt];
+
+    typedef skiagm::GM INHERITED;
+};
+
+DEF_GM( return SkNEW(VariedTextGM(false, false)); )
+DEF_GM( return SkNEW(VariedTextGM(true, false)); )
+DEF_GM( return SkNEW(VariedTextGM(false, true)); )
+DEF_GM( return SkNEW(VariedTextGM(true, true)); )