re-add samplerstress gm, but use blurmaskfilter instead (std filter)

gm/samplerstress.cpp

+/*
+ * Copyright 2012 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 "SkShader.h"
+#include "SkBlurMaskFilter.h"
+
+namespace skiagm {
+
+/**
+ * Stress test the GPU samplers by rendering a textured glyph with a mask and
+ * an AA clip
+ */
+class SamplerStressGM : public GM {
+public:
+    SamplerStressGM()
+    : fTextureCreated(false)
+    , fShader(NULL)
+    , fMaskFilter(NULL) {
+    }
+
+    virtual ~SamplerStressGM() {
+    }
+
+protected:
+    virtual uint32_t onGetFlags() const SK_OVERRIDE {
+        return kSkipTiled_Flag;
+    }
+
+    virtual SkString onShortName() {
+        return SkString("gpusamplerstress");
+    }
+
+    virtual SkISize onISize() {
+        return SkISize::Make(640, 480);
+    }
+
+    /**
+     * Create a red & green stripes on black texture
+     */
+    void createTexture() {
+        if (fTextureCreated) {
+            return;
+        }
+
+        static const int xSize = 16;
+        static const int ySize = 16;
+
+        fTexture.allocN32Pixels(xSize, ySize);
+        SkPMColor* addr = fTexture.getAddr32(0, 0);
+
+        for (int y = 0; y < ySize; ++y) {
+            for (int x = 0; x < xSize; ++x) {
+                addr[y*xSize+x] = SkPreMultiplyColor(SK_ColorBLACK);
+
+                if ((y % 5) == 0) {
+                    addr[y*xSize+x] = SkPreMultiplyColor(SK_ColorRED);
+                }
+                if ((x % 7) == 0) {
+                    addr[y*xSize+x] = SkPreMultiplyColor(SK_ColorGREEN);
+                }
+            }
+        }
+
+        fTextureCreated = true;
+    }
+
+    void createShader() {
+        if (NULL != fShader.get()) {
+            return;
+        }
+
+        createTexture();
+
+        fShader.reset(SkShader::CreateBitmapShader(fTexture,
+                                                   SkShader::kRepeat_TileMode,
+                                                   SkShader::kRepeat_TileMode));
+    }
+
+    void createMaskFilter() {
+        if (NULL != fMaskFilter.get()) {
+            return;
+        }
+
+        const SkScalar sigma = 1;
+        fMaskFilter.reset(SkBlurMaskFilter::Create(kNormal_SkBlurStyle, sigma));
+    }
+
+    virtual void onDraw(SkCanvas* canvas) {
+
+        createShader();
+        createMaskFilter();
+
+        canvas->save();
+
+        // draw a letter "M" with a green & red striped texture and a

[robertphillips, 2014/08/12 13:52:46]

blur

+        // stipple mask with a round rect soft clip
+        SkPaint paint;
+        paint.setAntiAlias(true);
+        paint.setTextSize(72);
+        paint.setShader(fShader.get());
+        paint.setMaskFilter(fMaskFilter.get());
+
+        SkRect temp;
+        temp.set(SkIntToScalar(115),
+                 SkIntToScalar(75),
+                 SkIntToScalar(144),
+                 SkIntToScalar(110));
+
+        SkPath path;
+        path.addRoundRect(temp, SkIntToScalar(5), SkIntToScalar(5));
+
+        canvas->clipPath(path, SkRegion::kReplace_Op, true); // AA is on
+
+        canvas->drawText("M", 1,
+                         SkIntToScalar(100), SkIntToScalar(100),
+                         paint);
+
+        canvas->restore();
+
+        // Now draw stroked versions of the "M" and the round rect so we can
+        // see what is going on
+        SkPaint paint2;
+        paint2.setColor(SK_ColorBLACK);
+        paint2.setAntiAlias(true);
+        paint2.setTextSize(72);
+        paint2.setStyle(SkPaint::kStroke_Style);
+        paint2.setStrokeWidth(1);
+        canvas->drawText("M", 1,
+                         SkIntToScalar(100), SkIntToScalar(100),
+                         paint2);
+
+        paint2.setColor(SK_ColorGRAY);
+
+        canvas->drawPath(path, paint2);
+    }
+
+private:
+    SkBitmap      fTexture;
+    bool          fTextureCreated;
+    SkAutoTUnref<SkShader>     fShader;
+    SkAutoTUnref<SkMaskFilter> fMaskFilter;
+
+    typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static GM* MyFactory(void*) { return new SamplerStressGM; }
+static GMRegistry reg(MyFactory);
+
+}