Make SkImageFilter methods const.

src/effects/SkMatrixConvolutionImageFilter.cpp

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkMatrixConvolutionImageFilter.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 134 matching lines @@
         } else {
             return *src.getAddr32(x, y);
         }
     }
 };
 
 template<class PixelFetcher, bool convolveAlpha>
 void SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src,
                                                   SkBitmap* result,
                                                   const SkIRect& rect,
-                                                  const SkIRect& bounds) {
+                                                  const SkIRect& bounds) const {
     for (int y = rect.fTop; y < rect.fBottom; ++y) {
         SkPMColor* dptr = result->getAddr32(rect.fLeft - bounds.fLeft, y - bounds.fTop);
         for (int x = rect.fLeft; x < rect.fRight; ++x) {
             SkScalar sumA = 0, sumR = 0, sumG = 0, sumB = 0;
             for (int cy = 0; cy < fKernelSize.fHeight; cy++) {
                 for (int cx = 0; cx < fKernelSize.fWidth; cx++) {
                     SkPMColor s = PixelFetcher::fetch(src,
                                                       x + cx - fTarget.fX,
                                                       y + cy - fTarget.fY,
                                                       bounds);
@@ skipping 19 matching lines @@
                 *dptr++ = SkPackARGB32(a, r, g, b);
             }
         }
     }
 }
 
 template<class PixelFetcher>
 void SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src,
                                                   SkBitmap* result,
                                                   const SkIRect& rect,
-                                                  const SkIRect& bounds) {
+                                                  const SkIRect& bounds) const {
     if (fConvolveAlpha) {
         filterPixels<PixelFetcher, true>(src, result, rect, bounds);
     } else {
         filterPixels<PixelFetcher, false>(src, result, rect, bounds);
     }
 }
 
 void SkMatrixConvolutionImageFilter::filterInteriorPixels(const SkBitmap& src,
                                                           SkBitmap* result,
                                                           const SkIRect& rect,
-                                                          const SkIRect& bounds) {
+                                                          const SkIRect& bounds) const {
     filterPixels<UncheckedPixelFetcher>(src, result, rect, bounds);
 }
 
 void SkMatrixConvolutionImageFilter::filterBorderPixels(const SkBitmap& src,
                                                         SkBitmap* result,
                                                         const SkIRect& rect,
-                                                        const SkIRect& bounds) {
+                                                        const SkIRect& bounds) const {
     switch (fTileMode) {
         case kClamp_TileMode:
             filterPixels<ClampPixelFetcher>(src, result, rect, bounds);
             break;
         case kRepeat_TileMode:
             filterPixels<RepeatPixelFetcher>(src, result, rect, bounds);
             break;
         case kClampToBlack_TileMode:
             filterPixels<ClampToBlackPixelFetcher>(src, result, rect, bounds);
             break;
@@ skipping 22 matching lines @@
             dstRow[x] = SkUnPreMultiply::PMColorToColor(srcRow[x]);
         }
     }
     return result;
 }
 
 bool SkMatrixConvolutionImageFilter::onFilterImage(Proxy* proxy,
                                                    const SkBitmap& source,
                                                    const SkMatrix& matrix,
                                                    SkBitmap* result,
-                                                   SkIPoint* offset) {
+                                                   SkIPoint* offset) const {
     SkBitmap src = source;
     SkIPoint srcOffset = SkIPoint::Make(0, 0);
     if (getInput(0) && !getInput(0)->filterImage(proxy, source, matrix, &src, &srcOffset)) {
         return false;
     }
 
     if (src.config() != SkBitmap::kARGB_8888_Config) {
         return false;
     }
 
@@ skipping 397 matching lines @@
                                                 fBias,
                                                 fTarget,
                                                 fTileMode,
                                                 fConvolveAlpha);
     return true;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 #endif