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
diff --git a/gm/morphology.cpp b/gm/morphology.cpp
new file mode 100644
index 0000000..bfaa406
--- /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);
+
+}