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