michael@0: 
michael@0: /*
michael@0:  * Copyright 2011 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #include "SkMathPriv.h"
michael@0: 
michael@0: #define SCALE_FILTER_NAME       MAKENAME(_filter_DX_shaderproc)
michael@0: 
michael@0: // Can't be static in the general case because some of these implementations
michael@0: // will be defined and referenced in different object files.
michael@0: void SCALE_FILTER_NAME(const SkBitmapProcState& s, int x, int y,
michael@0:                        DSTTYPE* SK_RESTRICT colors, int count);
michael@0: 
michael@0: void SCALE_FILTER_NAME(const SkBitmapProcState& s, int x, int y,
michael@0:                        DSTTYPE* SK_RESTRICT colors, int count) {
michael@0:     SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask |
michael@0:                              SkMatrix::kScale_Mask)) == 0);
michael@0:     SkASSERT(s.fInvKy == 0);
michael@0:     SkASSERT(count > 0 && colors != NULL);
michael@0:     SkASSERT(s.fFilterLevel != SkPaint::kNone_FilterLevel);
michael@0:     SkDEBUGCODE(CHECKSTATE(s);)
michael@0: 
michael@0:     const unsigned maxX = s.fBitmap->width() - 1;
michael@0:     const SkFixed oneX = s.fFilterOneX;
michael@0:     const SkFixed dx = s.fInvSx;
michael@0:     SkFixed fx;
michael@0:     const SRCTYPE* SK_RESTRICT row0;
michael@0:     const SRCTYPE* SK_RESTRICT row1;
michael@0:     unsigned subY;
michael@0: 
michael@0:     {
michael@0:         SkPoint pt;
michael@0:         s.fInvProc(s.fInvMatrix, SkIntToScalar(x) + SK_ScalarHalf,
michael@0:                    SkIntToScalar(y) + SK_ScalarHalf, &pt);
michael@0:         SkFixed fy = SkScalarToFixed(pt.fY) - (s.fFilterOneY >> 1);
michael@0:         const unsigned maxY = s.fBitmap->height() - 1;
michael@0:         // compute our two Y values up front
michael@0:         subY = TILEY_LOW_BITS(fy, maxY);
michael@0:         int y0 = TILEY_PROCF(fy, maxY);
michael@0:         int y1 = TILEY_PROCF((fy + s.fFilterOneY), maxY);
michael@0: 
michael@0:         const char* SK_RESTRICT srcAddr = (const char*)s.fBitmap->getPixels();
michael@0:         size_t rb = s.fBitmap->rowBytes();
michael@0:         row0 = (const SRCTYPE*)(srcAddr + y0 * rb);
michael@0:         row1 = (const SRCTYPE*)(srcAddr + y1 * rb);
michael@0:         // now initialize fx
michael@0:         fx = SkScalarToFixed(pt.fX) - (oneX >> 1);
michael@0:     }
michael@0: 
michael@0: #ifdef PREAMBLE
michael@0:     PREAMBLE(s);
michael@0: #endif
michael@0: 
michael@0:     do {
michael@0:         unsigned subX = TILEX_LOW_BITS(fx, maxX);
michael@0:         unsigned x0 = TILEX_PROCF(fx, maxX);
michael@0:         unsigned x1 = TILEX_PROCF((fx + oneX), maxX);
michael@0: 
michael@0:         FILTER_PROC(subX, subY,
michael@0:                     SRC_TO_FILTER(row0[x0]),
michael@0:                     SRC_TO_FILTER(row0[x1]),
michael@0:                     SRC_TO_FILTER(row1[x0]),
michael@0:                     SRC_TO_FILTER(row1[x1]),
michael@0:                     colors);
michael@0:         colors += 1;
michael@0: 
michael@0:         fx += dx;
michael@0:     } while (--count != 0);
michael@0: 
michael@0: #ifdef POSTAMBLE
michael@0:     POSTAMBLE(s);
michael@0: #endif
michael@0: }
michael@0: 
michael@0: ///////////////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: #undef TILEX_PROCF
michael@0: #undef TILEY_PROCF
michael@0: #undef TILEX_LOW_BITS
michael@0: #undef TILEY_LOW_BITS
michael@0: #undef MAKENAME
michael@0: #undef SRCTYPE
michael@0: #undef DSTTYPE
michael@0: #undef CHECKSTATE
michael@0: #undef SRC_TO_FILTER
michael@0: #undef FILTER_TO_DST
michael@0: #undef PREAMBLE
michael@0: #undef POSTAMBLE
michael@0: 
michael@0: #undef SCALE_FILTER_NAME