Run CanvasState test across a library boundary.

tests/CanvasStateHelpers.cpp

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "CanvasStateHelpers.h"
+#include "SkCanvas.h"
+#include "SkCanvasStateUtils.h"
+#include "SkPaint.h"
+#include "SkRect.h"
+#include "SkRegion.h"
+
+void complex_layers_draw(SkCanvas* canvas, float left, float top,
+                         float right, float bottom, int32_t spacer) {
+    SkPaint bluePaint;
+    bluePaint.setColor(SK_ColorBLUE);
+    bluePaint.setStyle(SkPaint::kFill_Style);
+
+    SkRect rect = SkRect::MakeLTRB(left, top, right, bottom);
+    canvas->drawRect(rect, bluePaint);
+    canvas->translate(0, rect.height() + spacer);
+    canvas->drawRect(rect, bluePaint);
+}
+
+extern "C" bool complex_layers_draw_from_canvas_state(SkCanvasState* state,
+        float left, float top, float right, float bottom, int32_t spacer) {
+    SkCanvas* canvas = SkCanvasStateUtils::CreateFromCanvasState(state);
+    if (!canvas) {
+        return false;
+    }
+    complex_layers_draw(canvas, left, top, right, bottom, spacer);
+    canvas->unref();
+    return true;
+}
+
+void test_complex_clips_draw(SkCanvas* canvas, int32_t left, int32_t top,
+        // FIXME: Don't use SkRegion...
+        int32_t right, int32_t bottom, int32_t clipOp, const SkRegion& localRegion) {
+    canvas->save();
+    SkRect clipRect = SkRect::MakeLTRB(SkIntToScalar(left), SkIntToScalar(top),
+                                       SkIntToScalar(right), SkIntToScalar(bottom));
+    canvas->clipRect(clipRect, (SkRegion::Op) clipOp);
+    canvas->drawColor(SK_ColorBLUE);
+    canvas->restore();
+
+    canvas->clipRegion(localRegion, (SkRegion::Op) clipOp);
+    canvas->drawColor(SK_ColorBLUE);
+}
+
+extern "C" bool test_complex_clips_draw_from_canvas_state(SkCanvasState* state, int32_t left,
+        int32_t top, int32_t right, int32_t bottom, int32_t clipOp, const SkRegion* localRegion) {
+    SkCanvas* canvas = SkCanvasStateUtils::CreateFromCanvasState(state);
+    if (!canvas) {
+        return false;
+    }
+    test_complex_clips_draw(canvas, left, top, right, bottom, clipOp, *localRegion);
+    canvas->unref();
+    return true;
+}
+