add test for rotated saveLayer, to see that we clip against the specified bounds

(hint: we don't at the moment)



git-svn-id: http://skia.googlecode.com/svn/trunk@5794 2bbb7eff-a529-9590-31e7-b0007b416f81

gm/savelayer.cpp

@@ -0,0 +1,76 @@
+/*
+ * 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"
+
+// This should be on SkCanvas imho
+static void rotateAbout(SkCanvas* canvas, SkScalar degrees,
+                        SkScalar px, SkScalar py) {
+    canvas->translate(px, py);
+    canvas->rotate(degrees);
+    canvas->translate(-px, -py);
+}
+
+class SaveLayerGM : public skiagm::GM {
+    void drawStuff(SkCanvas* canvas, const SkRect& r) {
+        SkPaint paint;
+        paint.setAntiAlias(true);
+        canvas->drawOval(r, paint);
+    }
+
+public:
+    SaveLayerGM() {}
+
+protected:
+    SkString onShortName() {
+        return SkString("savelayer");
+    }
+
+    virtual SkISize onISize() { return SkISize::Make(100, 100); }
+
+    virtual void onDraw(SkCanvas* canvas) {
+        SkPaint hairpaint;
+        hairpaint.setAntiAlias(true);
+        hairpaint.setStyle(SkPaint::kStroke_Style);
+        hairpaint.setColor(SK_ColorRED);
+
+        canvas->translate(50, 50);
+
+        SkRect r = SkRect::MakeWH(100, 60);
+        SkRect r2 = r;
+        r2.inset(5, 5);
+
+        this->drawStuff(canvas, r);
+        canvas->drawRect(r, hairpaint);
+        canvas->translate(r.width() * 5/4, 0);
+    
+        canvas->saveLayer(&r2, NULL);
+        this->drawStuff(canvas, r);
+        canvas->restore();
+        canvas->drawRect(r, hairpaint);
+        canvas->translate(r.width() * 5/4, 0);
+
+        // We need to ensure that we still clip against r2 (after it is rotated)
+        // even though the layer's bounds will be larger (since they are the
+        // enclosing rect of rotated-r2).
+
+        rotateAbout(canvas, 30, r.centerX(), r.centerY());
+        canvas->saveLayer(&r2, NULL);
+        this->drawStuff(canvas, r);
+        canvas->restore();
+        canvas->drawRect(r, hairpaint);
+    }
+
+private:
+    typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static skiagm::GM* MyFactory(void*) { return new SaveLayerGM; }
+static skiagm::GMRegistry reg(MyFactory);

gyp/gmslides.gypi

@@ -57,6 +57,7 @@
     '../gm/poly2poly.cpp',
     '../gm/quadpaths.cpp',
     '../gm/samplerstress.cpp',
+    '../gm/savelayer.cpp',
     '../gm/shaderbounds.cpp',
     '../gm/shadertext.cpp',
     '../gm/shadows.cpp',