Add subsetting to SkScaledCodec

src/codec/SkBmpRLECodec.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBmpRLECodec.h"
 #include "SkCodecPriv.h"
 #include "SkColorPriv.h"
@@ skipping 178 matching lines @@
     fRLEBytes = remainingBytes + additionalBytes;
     return fRLEBytes;
 }
 
 /*
  * Set an RLE pixel using the color table
  */
 void SkBmpRLECodec::setPixel(void* dst, size_t dstRowBytes,
                              const SkImageInfo& dstInfo, uint32_t x, uint32_t y,
                              uint8_t index) {
-    if (is_coord_necessary(x, fSampleX, dstInfo.width())) {
+    if (is_coord_necessary(x, fSampleX, this->subsetWidth(), this->subsetLeft())) {
         // Set the row
         uint32_t row = this->getDstRow(y, dstInfo.height());
 
         // Set the pixel based on destination color type
         const int dstX = get_dst_coord(x, fSampleX);
         switch (dstInfo.colorType()) {
             case kN32_SkColorType: {
                 SkPMColor* dstRow = SkTAddOffset<SkPMColor>(dst, row * (int) dstRowBytes);
                 dstRow[dstX] = fColorTable->operator[](index);
                 break;
@@ skipping 12 matching lines @@
     }
 }
 
 /*
  * Set an RLE pixel from R, G, B values
  */
 void SkBmpRLECodec::setRGBPixel(void* dst, size_t dstRowBytes,
                                 const SkImageInfo& dstInfo, uint32_t x,
                                 uint32_t y, uint8_t red, uint8_t green,
                                 uint8_t blue) {
-    if (is_coord_necessary(x, fSampleX, dstInfo.width())) {
+    if (is_coord_necessary(x, fSampleX, this->subsetWidth(), this->subsetLeft())) {
         // Set the row
         uint32_t row = this->getDstRow(y, dstInfo.height());
 
         // Set the pixel based on destination color type
         const int dstX = get_dst_coord(x, fSampleX);
         switch (dstInfo.colorType()) {
             case kN32_SkColorType: {
                 SkPMColor* dstRow = SkTAddOffset<SkPMColor>(dst, row * (int) dstRowBytes);
                 dstRow[dstX] = SkPackARGB32NoCheck(0xFF, red, green, blue);
                 break;
@@ skipping 263 matching lines @@
         fSampler.reset(new SkBmpRLESampler(this));
     }
 
     return fSampler;
 }
 
 int SkBmpRLECodec::setSampleX(int sampleX) {
     fSampleX = sampleX;
     return get_scaled_dimension(this->getInfo().width(), sampleX);
 }