Implement crop rect for SkImageFilter

src/effects/SkColorFilterImageFilter.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 "SkColorFilterImageFilter.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
@@ skipping 39 matching lines @@
 bool matrix_needs_clamping(SkScalar matrix[20]) {
     return component_needs_clamping(matrix)
         || component_needs_clamping(matrix+5)
         || component_needs_clamping(matrix+10)
         || component_needs_clamping(matrix+15);
 }
 
 };
 
 SkColorFilterImageFilter* SkColorFilterImageFilter::Create(SkColorFilter* cf,
-        SkImageFilter* input) {
+        SkImageFilter* input, const SkIRect* cropRect) {
     SkASSERT(cf);
     SkScalar colorMatrix[20], inputMatrix[20];
     SkColorFilter* inputColorFilter;
     if (input && cf->asColorMatrix(colorMatrix)
               && input->asColorFilter(&inputColorFilter)
               && (NULL != inputColorFilter)) {
         SkAutoUnref autoUnref(inputColorFilter);
         if (inputColorFilter->asColorMatrix(inputMatrix) && !matrix_needs_clamping(inputMatrix)) {
             SkScalar combinedMatrix[20];
             mult_color_matrix(inputMatrix, colorMatrix, combinedMatrix);
             SkAutoTUnref<SkColorFilter> newCF(SkNEW_ARGS(SkColorMatrixFilter, (combinedMatrix)));
-            return SkNEW_ARGS(SkColorFilterImageFilter, (newCF, input->getInput(0)));
+            return SkNEW_ARGS(SkColorFilterImageFilter, (newCF, input->getInput(0), cropRect));
         }
     }
-    return SkNEW_ARGS(SkColorFilterImageFilter, (cf, input));
+    return SkNEW_ARGS(SkColorFilterImageFilter, (cf, input, cropRect));
 }
 
-SkColorFilterImageFilter::SkColorFilterImageFilter(SkColorFilter* cf, SkImageFilter* input) : INHERITED(input), fColorFilter(cf) {
+SkColorFilterImageFilter::SkColorFilterImageFilter(SkColorFilter* cf,
+        SkImageFilter* input, const SkIRect* cropRect)
+    : INHERITED(input, cropRect), fColorFilter(cf) {
     SkASSERT(cf);
     SkSafeRef(cf);
 }
 
 SkColorFilterImageFilter::SkColorFilterImageFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
     fColorFilter = buffer.readFlattenableT<SkColorFilter>();
 }
 
 void SkColorFilterImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
 
     buffer.writeFlattenable(fColorFilter);
 }
 
 SkColorFilterImageFilter::~SkColorFilterImageFilter() {
     SkSafeUnref(fColorFilter);
 }
 
 bool SkColorFilterImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& source,
                                              const SkMatrix& matrix,
                                              SkBitmap* result,
                                              SkIPoint* loc) {
     SkBitmap src = source;
     if (getInput(0) && !getInput(0)->filterImage(proxy, source, matrix, &src, loc)) {
         return false;
     }
 
-    SkAutoTUnref<SkDevice> device(proxy->createDevice(src.width(), src.height()));
+    SkIRect bounds;
+    src.getBounds(&bounds);
+    if (!this->applyCropRect(&bounds)) {
+        return false;
+    }
+
+    SkAutoTUnref<SkDevice> device(proxy->createDevice(bounds.width(), bounds.height()));
     SkCanvas canvas(device.get());
     SkPaint paint;
 
     paint.setXfermodeMode(SkXfermode::kSrc_Mode);
     paint.setColorFilter(fColorFilter);
-    canvas.drawSprite(src, 0, 0, &paint);
+    canvas.drawSprite(src, -bounds.fLeft, -bounds.fTop, &paint);
 
     *result = device.get()->accessBitmap(false);
+    loc->fX += bounds.fLeft;
+    loc->fY += bounds.fTop;
     return true;
 }
 
 bool SkColorFilterImageFilter::asColorFilter(SkColorFilter** filter) const {
-    if (filter) {
-        *filter = fColorFilter;
-        fColorFilter->ref();
+    if (cropRect().isLargest()) {
+        if (filter) {
+            *filter = fColorFilter;
+            fColorFilter->ref();
+        }
+        return true;
     }
-    return true;
+    return false;
 }