diff options
author | humper@google.com <humper@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2013-05-31 12:49:18 +0000 |
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committer | humper@google.com <humper@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2013-05-31 12:49:18 +0000 |
commit | 1922c2e62ea7dd0c521bf0420210515734790e84 (patch) | |
tree | f0f815c56f540c6f4cd792e034146e1b3b67aaed /src | |
parent | 9e6793541f068d2a1389fc6126cddc5ed5d3262d (diff) |
specialize bicubic filtering for scale-only
BUG=
Review URL: https://codereview.chromium.org/15941012
git-svn-id: http://skia.googlecode.com/svn/trunk@9360 2bbb7eff-a529-9590-31e7-b0007b416f81
Diffstat (limited to 'src')
-rw-r--r-- | src/core/SkBitmapProcBicubic.cpp | 122 |
1 files changed, 87 insertions, 35 deletions
diff --git a/src/core/SkBitmapProcBicubic.cpp b/src/core/SkBitmapProcBicubic.cpp index 1c415fdadf..1616808484 100644 --- a/src/core/SkBitmapProcBicubic.cpp +++ b/src/core/SkBitmapProcBicubic.cpp @@ -35,22 +35,49 @@ static float poly_eval(const float cc[4], float t) { return cc[0] + t * (cc[1] + t * (cc[2] + t * cc[3])); } -static void build_coeff4(SkFixed dst[4], const float src[16], float t) { - dst[0] = SkFloatToFixed(poly_eval(&src[ 0], t)); - dst[1] = SkFloatToFixed(poly_eval(&src[ 4], t)); - dst[2] = SkFloatToFixed(poly_eval(&src[ 8], t)); - dst[3] = SkFloatToFixed(poly_eval(&src[12], t)); -} - -static void bicubicFilter(const SkBitmapProcState& s, int x, int y, - SkPMColor* SK_RESTRICT colors, int count) { - +static void build_coeff4(SkFixed dst[4], float t) { static const SkScalar coefficients[16] = { DS( 1.0 / 18.0), DS(-9.0 / 18.0), DS( 15.0 / 18.0), DS( -7.0 / 18.0), DS(16.0 / 18.0), DS( 0.0 / 18.0), DS(-36.0 / 18.0), DS( 21.0 / 18.0), DS( 1.0 / 18.0), DS( 9.0 / 18.0), DS( 27.0 / 18.0), DS(-21.0 / 18.0), DS( 0.0 / 18.0), DS( 0.0 / 18.0), DS( -6.0 / 18.0), DS( 7.0 / 18.0), }; + + dst[0] = SkFloatToFixed(poly_eval(&coefficients[ 0], t)); + dst[1] = SkFloatToFixed(poly_eval(&coefficients[ 4], t)); + dst[2] = SkFloatToFixed(poly_eval(&coefficients[ 8], t)); + dst[3] = SkFloatToFixed(poly_eval(&coefficients[12], t)); +} + +static SkPMColor doBicubicFilter(const SkBitmap *bm, SkFixed coeffX[4], SkFixed coeffY[4], + int x0, int x1, int x2, int x3, + int y0, int y1, int y2, int y3 ) +{ + SkPMColor s00 = *bm->getAddr32(x0, y0); + SkPMColor s10 = *bm->getAddr32(x1, y0); + SkPMColor s20 = *bm->getAddr32(x2, y0); + SkPMColor s30 = *bm->getAddr32(x3, y0); + SkPMColor s0 = cubicBlend(coeffX, s00, s10, s20, s30); + SkPMColor s01 = *bm->getAddr32(x0, y1); + SkPMColor s11 = *bm->getAddr32(x1, y1); + SkPMColor s21 = *bm->getAddr32(x2, y1); + SkPMColor s31 = *bm->getAddr32(x3, y1); + SkPMColor s1 = cubicBlend(coeffX, s01, s11, s21, s31); + SkPMColor s02 = *bm->getAddr32(x0, y2); + SkPMColor s12 = *bm->getAddr32(x1, y2); + SkPMColor s22 = *bm->getAddr32(x2, y2); + SkPMColor s32 = *bm->getAddr32(x3, y2); + SkPMColor s2 = cubicBlend(coeffX, s02, s12, s22, s32); + SkPMColor s03 = *bm->getAddr32(x0, y3); + SkPMColor s13 = *bm->getAddr32(x1, y3); + SkPMColor s23 = *bm->getAddr32(x2, y3); + SkPMColor s33 = *bm->getAddr32(x3, y3); + SkPMColor s3 = cubicBlend(coeffX, s03, s13, s23, s33); + return cubicBlend(coeffY, s0, s1, s2, s3); +} + +static void bicubicFilter(const SkBitmapProcState& s, int x, int y, + SkPMColor* SK_RESTRICT colors, int count) { const int maxX = s.fBitmap->width() - 1; const int maxY = s.fBitmap->height() - 1; @@ -65,8 +92,8 @@ static void bicubicFilter(const SkBitmapProcState& s, int x, int y, SkScalar fracty = srcPt.fY - SkScalarFloorToScalar(srcPt.fY); SkFixed coeffX[4], coeffY[4]; - build_coeff4(coeffX, coefficients, fractx); - build_coeff4(coeffY, coefficients, fracty); + build_coeff4(coeffX, fractx); + build_coeff4(coeffY, fracty); int sx = SkScalarFloorToInt(srcPt.fX); int sy = SkScalarFloorToInt(srcPt.fY); @@ -80,28 +107,47 @@ static void bicubicFilter(const SkBitmapProcState& s, int x, int y, int y1 = SkClampMax(sy , maxY); int y2 = SkClampMax(sy + 1, maxY); int y3 = SkClampMax(sy + 2, maxY); + + *colors++ = doBicubicFilter( s.fBitmap, coeffX, coeffY, x0, x1, x2, x3, y0, y1, y2, y3 ); + + x++; + } +} + +static void bicubicFilter_ScaleOnly(const SkBitmapProcState &s, int x, int y, + SkPMColor *SK_RESTRICT colors, int count) { + const int maxX = s.fBitmap->width() - 1; + const int maxY = s.fBitmap->height() - 1; + + SkPoint srcPt; + s.fInvProc(*s.fInvMatrix, SkIntToScalar(x), SkIntToScalar(y), &srcPt); + srcPt.fY -= SK_ScalarHalf; + SkScalar fracty = srcPt.fY - SkScalarFloorToScalar(srcPt.fY); + SkFixed coeffX[4], coeffY[4]; + build_coeff4(coeffY, fracty); + int sy = SkScalarFloorToInt(srcPt.fY); + int y0 = SkClampMax(sy - 1, maxY); + int y1 = SkClampMax(sy , maxY); + int y2 = SkClampMax(sy + 1, maxY); + int y3 = SkClampMax(sy + 2, maxY); + + while (count-- > 0) { + s.fInvProc(*s.fInvMatrix, SkIntToScalar(x), SkIntToScalar(y), &srcPt); + srcPt.fX -= SK_ScalarHalf; + SkScalar fractx = srcPt.fX - SkScalarFloorToScalar(srcPt.fX); + + build_coeff4(coeffX, fractx); + + int sx = SkScalarFloorToInt(srcPt.fX); + + // Here is where we can support other tile modes (e.g. repeat or mirror) + int x0 = SkClampMax(sx - 1, maxX); + int x1 = SkClampMax(sx , maxX); + int x2 = SkClampMax(sx + 1, maxX); + int x3 = SkClampMax(sx + 2, maxX); + + *colors++ = doBicubicFilter( s.fBitmap, coeffX, coeffY, x0, x1, x2, x3, y0, y1, y2, y3 ); - SkPMColor s00 = *s.fBitmap->getAddr32(x0, y0); - SkPMColor s10 = *s.fBitmap->getAddr32(x1, y0); - SkPMColor s20 = *s.fBitmap->getAddr32(x2, y0); - SkPMColor s30 = *s.fBitmap->getAddr32(x3, y0); - SkPMColor s0 = cubicBlend(coeffX, s00, s10, s20, s30); - SkPMColor s01 = *s.fBitmap->getAddr32(x0, y1); - SkPMColor s11 = *s.fBitmap->getAddr32(x1, y1); - SkPMColor s21 = *s.fBitmap->getAddr32(x2, y1); - SkPMColor s31 = *s.fBitmap->getAddr32(x3, y1); - SkPMColor s1 = cubicBlend(coeffX, s01, s11, s21, s31); - SkPMColor s02 = *s.fBitmap->getAddr32(x0, y2); - SkPMColor s12 = *s.fBitmap->getAddr32(x1, y2); - SkPMColor s22 = *s.fBitmap->getAddr32(x2, y2); - SkPMColor s32 = *s.fBitmap->getAddr32(x3, y2); - SkPMColor s2 = cubicBlend(coeffX, s02, s12, s22, s32); - SkPMColor s03 = *s.fBitmap->getAddr32(x0, y3); - SkPMColor s13 = *s.fBitmap->getAddr32(x1, y3); - SkPMColor s23 = *s.fBitmap->getAddr32(x2, y3); - SkPMColor s33 = *s.fBitmap->getAddr32(x3, y3); - SkPMColor s3 = cubicBlend(coeffX, s03, s13, s23, s33); - *colors++ = cubicBlend(coeffY, s0, s1, s2, s3); x++; } } @@ -130,6 +176,12 @@ SkBitmapProcState::chooseBicubicFilterProc(const SkPaint& paint) { if (0xFF != paint.getAlpha()) { return NULL; } - - return bicubicFilter; + + if (fInvType & SkMatrix::kAffine_Mask) { + return bicubicFilter; + } else if (fInvType & SkMatrix::kScale_Mask) { + return bicubicFilter_ScaleOnly; + } else { + return NULL; + } } |