Fix CTM application in SkResizeImagefilter; implement bounds traversals.

gm/imageresizetiled.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 "gm.h"
-#include "SkBlurImageFilter.h"
+#include "SkResizeImageFilter.h"
 #include "SkRandom.h"
 
 #define WIDTH 640
 #define HEIGHT 480
 
+#define RESIZE_FACTOR SkIntToScalar(2)
+
 namespace skiagm {
 
-class ImageBlurTiledGM : public GM {
+class ImageResizeTiledGM : public GM {
 public:
-    ImageBlurTiledGM(SkScalar sigmaX, SkScalar sigmaY)
-        : fSigmaX(sigmaX), fSigmaY(sigmaY) {
+    ImageResizeTiledGM() {
     }
 
 protected:
-    virtual SkString onShortName() {
-        return SkString("imageblurtiled");
+    virtual SkString onShortName() SK_OVERRIDE {
+        return SkString("imageresizetiled");
     }
 
-    virtual SkISize onISize() {
+    virtual SkISize onISize() SK_OVERRIDE {
         return make_isize(WIDTH, HEIGHT);
     }
 
-    virtual void onDraw(SkCanvas* canvas) {
+    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         SkPaint paint;
-        paint.setImageFilter(new SkBlurImageFilter(fSigmaX, fSigmaY))->unref();
-        const SkScalar tile_size = SkIntToScalar(128);
+        SkAutoTUnref<SkImageFilter> imageFilter(
+            new SkResizeImageFilter(RESIZE_FACTOR, RESIZE_FACTOR, SkPaint::kNone_FilterLevel));
+        paint.setImageFilter(imageFilter.get());
+        const SkScalar tile_size = SkIntToScalar(100);
         SkRect bounds;
         canvas->getClipBounds(&bounds);
-        for (SkScalar y = bounds.top(); y < bounds.bottom(); y += tile_size) {
-            for (SkScalar x = bounds.left(); x < bounds.right(); x += tile_size) {
+        for (SkScalar y = 0; y < HEIGHT; y += tile_size) {
+            for (SkScalar x = 0; x < WIDTH; x += tile_size) {
                 canvas->save();
                 canvas->clipRect(SkRect::MakeXYWH(x, y, tile_size, tile_size));
+                canvas->scale(SkScalarInvert(RESIZE_FACTOR),
+                              SkScalarInvert(RESIZE_FACTOR));
                 canvas->saveLayer(NULL, &paint);
                 const char* str[] = {
                     "The quick",
                     "brown fox",
                     "jumped over",
                     "the lazy dog.",
                 };
                 SkPaint textPaint;
                 textPaint.setAntiAlias(true);
                 textPaint.setTextSize(SkIntToScalar(100));
                 int posY = 0;
                 for (unsigned i = 0; i < SK_ARRAY_COUNT(str); i++) {
                     posY += 100;
                     canvas->drawText(str[i], strlen(str[i]), SkIntToScalar(0),
                                      SkIntToScalar(posY), textPaint);
                 }
                 canvas->restore();
                 canvas->restore();
             }
         }
     }
 
 private:
-    SkScalar fSigmaX;
-    SkScalar fSigmaY;
-
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
-static GM* MyFactory1(void*) { return new ImageBlurTiledGM(3.0f, 3.0f); }
-static GMRegistry reg1(MyFactory1);
+DEF_GM(return new ImageResizeTiledGM(); )
 
 }