1 /* 2 * Copyright 2011 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "SkMath.h" 9 #include "SkMathPriv.h" 10 11 #define SCALE_FILTER_NAME MAKENAME(_filter_scale) 12 13 #define PACK_FILTER_X_NAME MAKENAME(_pack_filter_x) 14 #define PACK_FILTER_Y_NAME MAKENAME(_pack_filter_y) 15 16 #ifndef PREAMBLE 17 #define PREAMBLE(state) 18 #define PREAMBLE_PARAM_X 19 #define PREAMBLE_PARAM_Y 20 #define PREAMBLE_ARG_X 21 #define PREAMBLE_ARG_Y 22 #endif 23 24 // declare functions externally to suppress warnings. 25 void SCALE_FILTER_NAME(const SkBitmapProcState& s, 26 uint32_t xy[], int count, int x, int y); 27 28 static inline uint32_t PACK_FILTER_Y_NAME(SkFixed f, unsigned max, 29 SkFixed one PREAMBLE_PARAM_Y) { 30 unsigned i = TILEY_PROCF(f, max); 31 i = (i << 4) | EXTRACT_LOW_BITS(f, max); 32 return (i << 14) | (TILEY_PROCF((f + one), max)); 33 } 34 35 static inline uint32_t PACK_FILTER_X_NAME(SkFixed f, unsigned max, 36 SkFixed one PREAMBLE_PARAM_X) { 37 unsigned i = TILEX_PROCF(f, max); 38 i = (i << 4) | EXTRACT_LOW_BITS(f, max); 39 return (i << 14) | (TILEX_PROCF((f + one), max)); 40 } 41 42 void SCALE_FILTER_NAME(const SkBitmapProcState& s, 43 uint32_t xy[], int count, int x, int y) { 44 SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask | 45 SkMatrix::kScale_Mask)) == 0); 46 SkASSERT(s.fInvKy == 0); 47 48 PREAMBLE(s); 49 50 const unsigned maxX = s.fPixmap.width() - 1; 51 const SkFixed one = s.fFilterOneX; 52 const SkFractionalInt dx = s.fInvSxFractionalInt; 53 SkFractionalInt fx; 54 55 { 56 const SkBitmapProcStateAutoMapper mapper(s, x, y); 57 const SkFixed fy = mapper.fixedY(); 58 const unsigned maxY = s.fPixmap.height() - 1; 59 // compute our two Y values up front 60 *xy++ = PACK_FILTER_Y_NAME(fy, maxY, s.fFilterOneY PREAMBLE_ARG_Y); 61 // now initialize fx 62 fx = mapper.fractionalIntX(); 63 } 64 65 #ifdef CHECK_FOR_DECAL 66 const SkFixed fixedFx = SkFractionalIntToFixed(fx); 67 const SkFixed fixedDx = SkFractionalIntToFixed(dx); 68 if (can_truncate_to_fixed_for_decal(fixedFx, fixedDx, count, maxX)) { 69 decal_filter_scale(xy, fixedFx, fixedDx, count); 70 } else 71 #endif 72 { 73 do { 74 SkFixed fixedFx = SkFractionalIntToFixed(fx); 75 *xy++ = PACK_FILTER_X_NAME(fixedFx, maxX, one PREAMBLE_ARG_X); 76 fx += dx; 77 } while (--count != 0); 78 } 79 } 80 81 #undef MAKENAME 82 #undef TILEX_PROCF 83 #undef TILEY_PROCF 84 #ifdef CHECK_FOR_DECAL 85 #undef CHECK_FOR_DECAL 86 #endif 87 88 #undef SCALE_FILTER_NAME 89 90 #undef PREAMBLE 91 #undef PREAMBLE_PARAM_X 92 #undef PREAMBLE_PARAM_Y 93 #undef PREAMBLE_ARG_X 94 #undef PREAMBLE_ARG_Y 95 96 #undef EXTRACT_LOW_BITS 97
