Implements a new class, SkSingleInputImageFilter, to handle DAG connectivity

for filters with a single image input.  This provides functionality to store,
flatten and unflatten a single SkImageFilter input, as well as to recursively
evaluate it on the CPU or GPU.  The following classes were re-parented to 
implement DAG connectivity:  SkBlurImageFilter, SkDilateImageFilter,
SkErodeImageFilter, SkColorFilterImageFilter.  The constructors for each
have been appended with a new parameter, representing the input filter
(default NULL).

This change also implements an arbitrary SkBitmap input source for filtering,
SkBitmapSource.

NOTE:  This CL will require gyp file changes when rolling past this revision.

Review URL:  https://codereview.appspot.com/6462071/



git-svn-id: http://skia.googlecode.com/svn/trunk@5170 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 76 insertions, 0 deletions

diff --git a/gm/imagefiltersgraph.cpp b/gm/imagefiltersgraph.cpp
new file mode 100644
index 0000000000..7c60546a11
--- /dev/null
+++ b/gm/imagefiltersgraph.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 "SkBitmapSource.h"
+#include "SkBlurImageFilter.h"
+#include "SkMorphologyImageFilter.h"
+
+#include "SkTestImageFilters.h"
+
+///////////////////////////////////////////////////////////////////////////////
+
+class ImageFiltersGraphGM : public skiagm::GM {
+public:
+    ImageFiltersGraphGM() : fInitialized(false) {}
+
+protected:
+
+    virtual SkString onShortName() {
+        return SkString("imagefiltersgraph");
+    }
+
+    void make_bitmap() {
+        fBitmap.setConfig(SkBitmap::kARGB_8888_Config, 100, 100);
+        fBitmap.allocPixels();
+        SkDevice device(fBitmap);
+        SkCanvas canvas(&device);
+        canvas.clear(0x00000000);
+        SkPaint paint;
+        paint.setAntiAlias(true);
+        paint.setColor(0xFFFFFFFF);
+        paint.setTextSize(SkIntToScalar(96));
+        const char* str = "e";
+        canvas.drawText(str, strlen(str), SkIntToScalar(20), SkIntToScalar(70), paint);
+    }
+
+    virtual SkISize onISize() { return SkISize::Make(500, 500); }
+
+    virtual void onDraw(SkCanvas* canvas) {
+        if (!fInitialized) {
+            this->make_bitmap();
+            fInitialized = true;
+        }
+        canvas->clear(0x00000000);
+        
+        SkAutoTUnref<SkImageFilter> bitmapSource(new SkBitmapSource(fBitmap));
+
+        SkAutoTUnref<SkColorFilter> cf(SkColorFilter::CreateModeFilter(SK_ColorRED,
+                                                     SkXfermode::kSrcIn_Mode));
+        SkAutoTUnref<SkImageFilter> blur(new SkBlurImageFilter(4.0f, 4.0f, bitmapSource));
+        SkAutoTUnref<SkImageFilter> erode(new SkErodeImageFilter(4, 4, blur));
+        SkAutoTUnref<SkImageFilter> color(new SkColorFilterImageFilter(cf, erode));
+        SkAutoTUnref<SkImageFilter> merge(new SkMergeImageFilter(blur, color));
+
+        SkPaint paint;
+        paint.setImageFilter(merge);
+        canvas->drawPaint(paint);
+    }
+
+private:
+    typedef GM INHERITED;
+    SkBitmap fBitmap;
+    bool fInitialized;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+static skiagm::GM* MyFactory(void*) { return new ImageFiltersGraphGM; }
+static skiagm::GMRegistry reg(MyFactory);
+
+