| |
| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| |
| |
| #define SCALE_FILTER_NAME MAKENAME(_filter_DX_shaderproc) |
| |
| static void SCALE_FILTER_NAME(const SkBitmapProcState& s, int x, int y, |
| DSTTYPE* SK_RESTRICT colors, int count) { |
| SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask | |
| SkMatrix::kScale_Mask)) == 0); |
| SkASSERT(s.fInvKy == 0); |
| SkASSERT(count > 0 && colors != NULL); |
| SkASSERT(s.fDoFilter); |
| SkDEBUGCODE(CHECKSTATE(s);) |
| |
| const unsigned maxX = s.fBitmap->width() - 1; |
| const SkFixed oneX = s.fFilterOneX; |
| const SkFixed dx = s.fInvSx; |
| SkFixed fx; |
| const SRCTYPE* SK_RESTRICT row0; |
| const SRCTYPE* SK_RESTRICT row1; |
| unsigned subY; |
| |
| { |
| SkPoint pt; |
| s.fInvProc(*s.fInvMatrix, SkIntToScalar(x) + SK_ScalarHalf, |
| SkIntToScalar(y) + SK_ScalarHalf, &pt); |
| SkFixed fy = SkScalarToFixed(pt.fY) - (s.fFilterOneY >> 1); |
| const unsigned maxY = s.fBitmap->height() - 1; |
| // compute our two Y values up front |
| subY = TILEY_LOW_BITS(fy, maxY); |
| int y0 = TILEY_PROCF(fy, maxY); |
| int y1 = TILEY_PROCF((fy + s.fFilterOneY), maxY); |
| |
| const char* SK_RESTRICT srcAddr = (const char*)s.fBitmap->getPixels(); |
| unsigned rb = s.fBitmap->rowBytes(); |
| row0 = (const SRCTYPE*)(srcAddr + y0 * rb); |
| row1 = (const SRCTYPE*)(srcAddr + y1 * rb); |
| // now initialize fx |
| fx = SkScalarToFixed(pt.fX) - (oneX >> 1); |
| } |
| |
| #ifdef PREAMBLE |
| PREAMBLE(s); |
| #endif |
| |
| do { |
| unsigned subX = TILEX_LOW_BITS(fx, maxX); |
| unsigned x0 = TILEX_PROCF(fx, maxX); |
| unsigned x1 = TILEX_PROCF((fx + oneX), maxX); |
| |
| FILTER_PROC(subX, subY, |
| SRC_TO_FILTER(row0[x0]), |
| SRC_TO_FILTER(row0[x1]), |
| SRC_TO_FILTER(row1[x0]), |
| SRC_TO_FILTER(row1[x1]), |
| colors); |
| colors += 1; |
| |
| fx += dx; |
| } while (--count != 0); |
| |
| #ifdef POSTAMBLE |
| POSTAMBLE(s); |
| #endif |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #undef TILEX_PROCF |
| #undef TILEY_PROCF |
| #undef TILEX_LOW_BITS |
| #undef TILEY_LOW_BITS |
| #undef MAKENAME |
| #undef SRCTYPE |
| #undef DSTTYPE |
| #undef CHECKSTATE |
| #undef SRC_TO_FILTER |
| #undef FILTER_TO_DST |
| #undef PREAMBLE |
| #undef POSTAMBLE |
| |
| #undef SCALE_FILTER_NAME |
