Erode and dilate image filter effects, CPU and GPU implementations.

Review URL:  http://codereview.appspot.com/5656067/



git-svn-id: http://skia.googlecode.com/svn/trunk@3310 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 98 insertions, 0 deletions

diff --git a/gm/morphology.cpp b/gm/morphology.cpp
new file mode 100644
index 0000000000..bfaa406336
--- /dev/null
+++ b/gm/morphology.cpp
@@ -0,0 +1,98 @@
+/*
+ * 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 "SkMorphologyImageFilter.h"
+
+#define WIDTH 640
+#define HEIGHT 480
+
+namespace skiagm {
+
+class MorphologyGM : public GM {
+public:
+    MorphologyGM() {
+        this->setBGColor(0xFF000000);
+        fOnce = false;
+    }
+    
+protected:
+    virtual SkString onShortName() {
+        return SkString("morphology");
+    }
+
+    void make_bitmap() {
+        fBitmap.setConfig(SkBitmap::kARGB_8888_Config, 135, 135);
+        fBitmap.allocPixels();
+        SkDevice device(fBitmap);
+        SkCanvas canvas(&device);
+        canvas.clear(0x0);
+        SkPaint paint;
+        paint.setAntiAlias(true);
+        const char* str1 = "ABC";
+        const char* str2 = "XYZ";
+        paint.setColor(0xFFFFFFFF);
+        paint.setTextSize(64);
+        canvas.drawText(str1, strlen(str1), 10, 55, paint);
+        canvas.drawText(str2, strlen(str2), 10, 110, paint);
+    }
+
+    virtual SkISize onISize() {
+        return make_isize(WIDTH, HEIGHT);
+    }
+    virtual void onDraw(SkCanvas* canvas) {
+        if (!fOnce) {
+            make_bitmap();
+            fOnce = true;
+        }
+        struct {
+            int fRadiusX, fRadiusY;
+            bool erode;
+            SkScalar fX, fY;
+        } samples[] = {
+            { 0, 0, false, 0,   0 },
+            { 0, 2, false, 140, 0 },
+            { 2, 0, false, 280, 0 },
+            { 2, 2, false, 420, 0 },
+            { 0, 0, true,  0,   140 },
+            { 0, 2, true,  140, 140 },
+            { 2, 0, true,  280, 140 },
+            { 2, 2, true,  420, 140 },
+        };
+        const char* str = "The quick brown fox jumped over the lazy dog.";
+        SkPaint paint;
+        for (unsigned i = 0; i < SK_ARRAY_COUNT(samples); ++i) {
+            if (samples[i].erode) {
+                paint.setImageFilter(new SkErodeImageFilter(
+                    samples[i].fRadiusX,
+                    samples[i].fRadiusY))->unref();
+            } else {
+                paint.setImageFilter(new SkDilateImageFilter(
+                    samples[i].fRadiusX,
+                    samples[i].fRadiusY))->unref();
+            }
+            SkRect bounds = SkRect::MakeXYWH(samples[i].fX,
+                                             samples[i].fY,
+                                             140, 140);
+            canvas->saveLayer(&bounds, &paint);
+            canvas->drawBitmap(fBitmap, samples[i].fX, samples[i].fY);
+            canvas->restore();
+        }
+    }
+    
+private:
+    typedef GM INHERITED;
+    SkBitmap fBitmap;
+    bool fOnce;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static GM* MyFactory(void*) { return new MorphologyGM; }
+static GMRegistry reg(MyFactory);
+
+}