mirror of https://github.com/axmolengine/axmol.git
97 lines
3.0 KiB
C
97 lines
3.0 KiB
C
/*
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Copyright 2011 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#define SCALE_FILTER_NAME MAKENAME(_filter_DX_shaderproc)
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static void SCALE_FILTER_NAME(const SkBitmapProcState& s, int x, int y,
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DSTTYPE* SK_RESTRICT colors, int count) {
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SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask |
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SkMatrix::kScale_Mask)) == 0);
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SkASSERT(s.fInvKy == 0);
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SkASSERT(count > 0 && colors != NULL);
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SkASSERT(s.fDoFilter);
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SkDEBUGCODE(CHECKSTATE(s);)
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const unsigned maxX = s.fBitmap->width() - 1;
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const SkFixed oneX = s.fFilterOneX;
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const SkFixed dx = s.fInvSx;
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SkFixed fx;
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const SRCTYPE* SK_RESTRICT row0;
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const SRCTYPE* SK_RESTRICT row1;
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unsigned subY;
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{
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SkPoint pt;
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s.fInvProc(*s.fInvMatrix, SkIntToScalar(x) + SK_ScalarHalf,
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SkIntToScalar(y) + SK_ScalarHalf, &pt);
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SkFixed fy = SkScalarToFixed(pt.fY) - (s.fFilterOneY >> 1);
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const unsigned maxY = s.fBitmap->height() - 1;
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// compute our two Y values up front
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subY = TILEY_LOW_BITS(fy, maxY);
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int y0 = TILEY_PROCF(fy, maxY);
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int y1 = TILEY_PROCF((fy + s.fFilterOneY), maxY);
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const char* SK_RESTRICT srcAddr = (const char*)s.fBitmap->getPixels();
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unsigned rb = s.fBitmap->rowBytes();
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row0 = (const SRCTYPE*)(srcAddr + y0 * rb);
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row1 = (const SRCTYPE*)(srcAddr + y1 * rb);
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// now initialize fx
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fx = SkScalarToFixed(pt.fX) - (oneX >> 1);
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}
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#ifdef PREAMBLE
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PREAMBLE(s);
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#endif
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do {
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unsigned subX = TILEX_LOW_BITS(fx, maxX);
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unsigned x0 = TILEX_PROCF(fx, maxX);
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unsigned x1 = TILEX_PROCF((fx + oneX), maxX);
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FILTER_PROC(subX, subY,
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SRC_TO_FILTER(row0[x0]),
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SRC_TO_FILTER(row0[x1]),
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SRC_TO_FILTER(row1[x0]),
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SRC_TO_FILTER(row1[x1]),
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colors);
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colors += 1;
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fx += dx;
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} while (--count != 0);
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#ifdef POSTAMBLE
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POSTAMBLE(s);
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#endif
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}
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///////////////////////////////////////////////////////////////////////////////
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#undef TILEX_PROCF
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#undef TILEY_PROCF
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#undef TILEX_LOW_BITS
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#undef TILEY_LOW_BITS
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#undef MAKENAME
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#undef SRCTYPE
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#undef DSTTYPE
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#undef CHECKSTATE
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#undef SRC_TO_FILTER
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#undef FILTER_TO_DST
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#undef PREAMBLE
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#undef POSTAMBLE
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#undef SCALE_FILTER_NAME
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