2D kernel initial wiring for Guassian

gm/imageblur2.cpp

+/*
+ * Copyright 2011 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 "SkBlurImageFilter.h"
+#include "SkRandom.h"
+
+// TODO deprecate imageblur
+
+#define WIDTH 500
+#define HEIGHT 500
+#include <stdio.h>

[Stephen White, 2014/07/25 20:43:17]

Is this needed? If so, put it with the other #includes above.

+
+// TODO this surely exists somewhere

[Stephen White, 2014/07/25 20:43:17]

Try SK_ARRAY_COUNT.

+#define LENGTH(x) (sizeof((x)) / sizeof((x)[0]))
+
+static const float kBlurSigmas[] = {
+        0.0, 0.3f, 0.5f, 2.0f, 32.0f, 80.0f };
+
+const char* kTestStrings[] = {
+        "The quick`~",
+        "brown fox[]",
+        "jumped over",
+        "the lazy@#$",
+        "dog.{}!%^&",
+        "*()+=-\\'\"/",
+};
+
+namespace skiagm {
+
+class ImageBlur2GM : public GM {

[Stephen White, 2014/07/25 20:43:17]

Let's call it BlurImageFilter (like the other image filter GMs).

+public:
+    ImageBlur2GM() {
+        this->setBGColor(0xFFFFFFFF);
+        fName.printf("imageblur2");
+    }
+
+protected:
+    virtual uint32_t onGetFlags() const SK_OVERRIDE {
+        return kSkipTiled_Flag;
+    }
+
+    virtual SkString onShortName() {
+        return fName;
+    }
+
+    virtual SkISize onISize() {
+        return SkISize::Make(WIDTH, HEIGHT);
+    }
+
+    virtual void onDraw(SkCanvas* canvas) {
+        const int sigmaCount = LENGTH(kBlurSigmas);
+        const int testStringCount = LENGTH(kTestStrings);
+        SkScalar dx = WIDTH / sigmaCount;
+        SkScalar dy = HEIGHT / sigmaCount;
+        const int textSize = 12;
+
+        for (int x = 0; x < sigmaCount; x++) {
+            SkScalar sigmaX = kBlurSigmas[x];
+            for (int y = 0; y < sigmaCount; y++) {
+                SkScalar sigmaY = kBlurSigmas[y];
+
+                SkPaint paint;
+                paint.setImageFilter(SkBlurImageFilter::Create(sigmaX, sigmaY))->unref();
+                canvas->saveLayer(NULL, &paint);
+
+                SkRandom rand;
+                SkPaint textPaint;
+                textPaint.setAntiAlias(true);
+                textPaint.setColor(rand.nextBits(24) | 0xFF000000);
+                textPaint.setTextSize(textSize);
+
+                for (int i = 0; i < testStringCount; i++) {
+                    canvas->drawText(kTestStrings[i],
+                                     strlen(kTestStrings[i]),
+                                     SkIntToScalar(x * dx),
+                                     SkIntToScalar(y * dy + textSize * i + textSize),
+                                     textPaint);
+                }
+                canvas->restore();
+            }
+        }
+    }
+
+private:
+    SkString fName;
+
+    typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static GM* MyFactory(void*) { return new ImageBlur2GM; }
+static GMRegistry reg(MyFactory);
+
+}