Fix Morphology effects sourcing outside of the crop rect.

gm/imagefilterscropped.cpp

 /*
  * Copyright 2011 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"
 #include "SkColorFilter.h"
 #include "SkColorPriv.h"
 #include "SkShader.h"
 
 #include "SkBlurImageFilter.h"
+#include "SkMorphologyImageFilter.h"
 #include "SkColorFilterImageFilter.h"
+#include "SkBitmapSource.h"
 #include "SkMergeImageFilter.h"
 #include "SkOffsetImageFilter.h"
 #include "SkTestImageFilters.h"
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static void draw_paint(SkCanvas* canvas, const SkRect& r, SkImageFilter* imf) {
     SkPaint paint;
     paint.setImageFilter(imf);
     paint.setColor(SK_ColorBLACK);
@@ skipping 65 matching lines @@
 
 class ImageFiltersCroppedGM : public skiagm::GM {
 public:
     ImageFiltersCroppedGM () {}
 
 protected:
     virtual SkString onShortName() {
         return SkString("imagefilterscropped");
     }
 
-    virtual SkISize onISize() { return SkISize::Make(400, 640); }
+    virtual SkISize onISize() { return SkISize::Make(400, 880); }
+
+    void make_checkerboard() {
+        fCheckerboard.allocN32Pixels(80, 80);
+        SkCanvas canvas(fCheckerboard);
+        canvas.clear(SK_ColorTRANSPARENT);
+        SkPaint darkPaint;
+        darkPaint.setColor(0xFF404040);
+        SkPaint lightPaint;
+        lightPaint.setColor(0xFFA0A0A0);
+        for (int y = 0; y < 80; y += 16) {
+            for (int x = 0; x < 80; x += 16) {
+                canvas.save();
+                canvas.translate(SkIntToScalar(x), SkIntToScalar(y));
+                canvas.drawRect(SkRect::MakeXYWH(0, 0, 8, 8), darkPaint);
+                canvas.drawRect(SkRect::MakeXYWH(8, 0, 8, 8), lightPaint);
+                canvas.drawRect(SkRect::MakeXYWH(0, 8, 8, 8), lightPaint);
+                canvas.drawRect(SkRect::MakeXYWH(8, 8, 8, 8), darkPaint);
+                canvas.restore();
+            }
+        }
+    }
 
     void draw_frame(SkCanvas* canvas, const SkRect& r) {
         SkPaint paint;
         paint.setStyle(SkPaint::kStroke_Style);
         paint.setColor(SK_ColorRED);
         canvas->drawRect(r, paint);
     }
 
+    virtual void onOnceBeforeDraw() SK_OVERRIDE{
+        make_checkerboard();
+    }
+
     virtual void onDraw(SkCanvas* canvas) {
         void (*drawProc[])(SkCanvas*, const SkRect&, SkImageFilter*) = {
             draw_sprite, draw_bitmap, draw_path, draw_paint, draw_text
         };
 
         SkAutoTUnref<SkColorFilter> cf(
             SkColorFilter::CreateModeFilter(SK_ColorBLUE, SkXfermode::kSrcIn_Mode));
         SkImageFilter::CropRect cropRect(SkRect::Make(SkIRect::MakeXYWH(10, 10, 44, 44)), SkImageFilter::CropRect::kHasAll_CropEdge);
         SkImageFilter::CropRect bogusRect(SkRect::Make(SkIRect::MakeXYWH(-100, -100, 10, 10)), SkImageFilter::CropRect::kHasAll_CropEdge);
 
         SkAutoTUnref<SkImageFilter> offset(SkOffsetImageFilter::Create(
             SkIntToScalar(-10), SkIntToScalar(-10)));
 
         SkAutoTUnref<SkImageFilter> cfOffset(SkColorFilterImageFilter::Create(cf.get(), offset.get()));
 
+        SkAutoTUnref<SkImageFilter> erodeX(SkErodeImageFilter::Create(8, 0, NULL, &cropRect));
+        SkAutoTUnref<SkImageFilter> erodeY(SkErodeImageFilter::Create(0, 8, NULL, &cropRect));
+
         SkImageFilter* filters[] = {
             NULL,
             SkColorFilterImageFilter::Create(cf.get(), NULL, &cropRect),
             SkBlurImageFilter::Create(1.0f, 1.0f, NULL, &cropRect),
             SkBlurImageFilter::Create(8.0f, 0.0f, NULL, &cropRect),
             SkBlurImageFilter::Create(0.0f, 8.0f, NULL, &cropRect),
             SkBlurImageFilter::Create(8.0f, 8.0f, NULL, &cropRect),
+            SkErodeImageFilter::Create(1, 1, NULL, &cropRect),
+            SkErodeImageFilter::Create(8, 0, erodeY, &cropRect),
+            SkErodeImageFilter::Create(0, 8, erodeX, &cropRect),
+            SkErodeImageFilter::Create(8, 8, NULL, &cropRect),
             SkMergeImageFilter::Create(NULL, cfOffset.get(), SkXfermode::kSrcOver_Mode, &cropRect),
             SkBlurImageFilter::Create(8.0f, 8.0f, NULL, &bogusRect),
             SkColorFilterImageFilter::Create(cf.get(), NULL, &bogusRect),
         };
 
         SkRect r = SkRect::MakeWH(SkIntToScalar(64), SkIntToScalar(64));
         SkScalar MARGIN = SkIntToScalar(16);
         SkScalar DX = r.width() + MARGIN;
         SkScalar DY = r.height() + MARGIN;
 
         canvas->translate(MARGIN, MARGIN);
         for (size_t j = 0; j < SK_ARRAY_COUNT(drawProc); ++j) {
             canvas->save();
             for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
+                SkPaint paint;
+                canvas->drawBitmap(fCheckerboard, 0, 0);
                 drawProc[j](canvas, r, filters[i]);
                 canvas->translate(0, DY);
             }
             canvas->restore();
             canvas->translate(DX, 0);
         }
 
         for(size_t j = 0; j < SK_ARRAY_COUNT(filters); ++j) {
             SkSafeUnref(filters[j]);
         }
     }
 
 private:
+    SkBitmap fCheckerboard;
     typedef GM INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static skiagm::GM* MyFactory(void*) { return new ImageFiltersCroppedGM; }
 static skiagm::GMRegistry reg(MyFactory);