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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkMathPriv.h"
#define SCALE_FILTER_NAME MAKENAME(_filter_DX_shaderproc)
// Can't be static in the general case because some of these implementations
// will be defined and referenced in different object files.
void SCALE_FILTER_NAME(const void* sIn, int x, int y, SkPMColor* SK_RESTRICT colors, int count);
void SCALE_FILTER_NAME(const void* sIn, int x, int y, SkPMColor* SK_RESTRICT colors, int count) {
const SkBitmapProcState& s = *static_cast<const SkBitmapProcState*>(sIn);
SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask |
SkMatrix::kScale_Mask)) == 0);
SkASSERT(s.fInvKy == 0);
SkASSERT(count > 0 && colors != nullptr);
SkASSERT(s.fFilterLevel != kNone_SkFilterQuality);
SkDEBUGCODE(CHECKSTATE(s);)
const unsigned maxX = s.fPixmap.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;
{
const SkBitmapProcStateAutoMapper mapper(s, x, y);
SkFixed fy = SkFractionalIntToFixed(mapper.y());
const unsigned maxY = s.fPixmap.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.fPixmap.addr();
size_t rb = s.fPixmap.rowBytes();
row0 = (const SRCTYPE*)(srcAddr + y0 * rb);
row1 = (const SRCTYPE*)(srcAddr + y1 * rb);
// now initialize fx
fx = SkFractionalIntToFixed(mapper.x());
}
#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 CHECKSTATE
#undef SRC_TO_FILTER
#undef FILTER_TO_DST
#undef PREAMBLE
#undef POSTAMBLE
#undef SCALE_FILTER_NAME
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