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      1 /*
      2     Copyright 2011 Google Inc.
      3 
      4     Licensed under the Apache License, Version 2.0 (the "License");
      5     you may not use this file except in compliance with the License.
      6     You may obtain a copy of the License at
      7 
      8     http://www.apache.org/licenses/LICENSE-2.0
      9 
     10     Unless required by applicable law or agreed to in writing, software
     11     distributed under the License is distributed on an "AS IS" BASIS,
     12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13     See the License for the specific language governing permissions and
     14     limitations under the License.
     15  */
     16 
     17 
     18 #define SCALE_FILTER_NAME       MAKENAME(_filter_DX_shaderproc)
     19 
     20 static void SCALE_FILTER_NAME(const SkBitmapProcState& s, int x, int y,
     21                               DSTTYPE* SK_RESTRICT colors, int count) {
     22     SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask |
     23                              SkMatrix::kScale_Mask)) == 0);
     24     SkASSERT(s.fInvKy == 0);
     25     SkASSERT(count > 0 && colors != NULL);
     26     SkASSERT(s.fDoFilter);
     27     SkDEBUGCODE(CHECKSTATE(s);)
     28 
     29     const unsigned maxX = s.fBitmap->width() - 1;
     30     const SkFixed oneX = s.fFilterOneX;
     31     const SkFixed dx = s.fInvSx;
     32     SkFixed fx;
     33     const SRCTYPE* SK_RESTRICT row0;
     34     const SRCTYPE* SK_RESTRICT row1;
     35     unsigned subY;
     36 
     37     {
     38         SkPoint pt;
     39         s.fInvProc(*s.fInvMatrix, SkIntToScalar(x) + SK_ScalarHalf,
     40                    SkIntToScalar(y) + SK_ScalarHalf, &pt);
     41         SkFixed fy = SkScalarToFixed(pt.fY) - (s.fFilterOneY >> 1);
     42         const unsigned maxY = s.fBitmap->height() - 1;
     43         // compute our two Y values up front
     44         subY = TILEY_LOW_BITS(fy, maxY);
     45         int y0 = TILEY_PROCF(fy, maxY);
     46         int y1 = TILEY_PROCF((fy + s.fFilterOneY), maxY);
     47 
     48         const char* SK_RESTRICT srcAddr = (const char*)s.fBitmap->getPixels();
     49         unsigned rb = s.fBitmap->rowBytes();
     50         row0 = (const SRCTYPE*)(srcAddr + y0 * rb);
     51         row1 = (const SRCTYPE*)(srcAddr + y1 * rb);
     52         // now initialize fx
     53         fx = SkScalarToFixed(pt.fX) - (oneX >> 1);
     54     }
     55 
     56 #ifdef PREAMBLE
     57     PREAMBLE(s);
     58 #endif
     59 
     60     do {
     61         unsigned subX = TILEX_LOW_BITS(fx, maxX);
     62         unsigned x0 = TILEX_PROCF(fx, maxX);
     63         unsigned x1 = TILEX_PROCF((fx + oneX), maxX);
     64 
     65         FILTER_PROC(subX, subY,
     66                     SRC_TO_FILTER(row0[x0]),
     67                     SRC_TO_FILTER(row0[x1]),
     68                     SRC_TO_FILTER(row1[x0]),
     69                     SRC_TO_FILTER(row1[x1]),
     70                     colors);
     71         colors += 1;
     72 
     73         fx += dx;
     74     } while (--count != 0);
     75 
     76 #ifdef POSTAMBLE
     77     POSTAMBLE(s);
     78 #endif
     79 }
     80 
     81 ///////////////////////////////////////////////////////////////////////////////
     82 
     83 #undef TILEX_PROCF
     84 #undef TILEY_PROCF
     85 #undef TILEX_LOW_BITS
     86 #undef TILEY_LOW_BITS
     87 #undef MAKENAME
     88 #undef SRCTYPE
     89 #undef DSTTYPE
     90 #undef CHECKSTATE
     91 #undef SRC_TO_FILTER
     92 #undef FILTER_TO_DST
     93 #undef PREAMBLE
     94 #undef POSTAMBLE
     95 
     96 #undef SCALE_FILTER_NAME
     97