diff options
| author |  reed <reed@chromium.org> | 2015-01-16 08:35:09 -0800 |
|---|---|---|
| committer |  Commit bot <commit-bot@chromium.org> | 2015-01-16 08:35:09 -0800 |
| commit | 7729e56a29a44bd47c69c8dc3247421595940acc (patch) | |
| tree | 7c7cb76c100e227cdc336120997c05632ba7137c /src/core | |
| parent | afe3005be3392e43bc51eb7eb2017eefaed85ad1 (diff) | |
use log2(scale) to compute mip level
now w/ expanded suppressions
This reverts commit b50ced703030dfbda4fc3ef5e6ec9a52fc0405f8.
BUG=skia:
TBR=
NOTRY=True
NOTREECHECKS=True
Review URL: https://codereview.chromium.org/856723003
Diffstat (limited to 'src/core')
| -rw-r--r-- | src/core/SkMipMap.cpp | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/src/core/SkMipMap.cpp b/src/core/SkMipMap.cpp index 83164b1526..2dad6d9c57 100644 --- a/src/core/SkMipMap.cpp +++ b/src/core/SkMipMap.cpp @@ -225,8 +225,7 @@ SkMipMap* SkMipMap::Build(const SkBitmap& src, SkDiscardableFactoryProc fact) { /////////////////////////////////////////////////////////////////////////////// -//static int gCounter; - +#ifdef SK_SUPPORT_LEGACY_MIPLEVELCHOICE static SkFixed compute_level(SkScalar scale) { SkScalar inv = SkScalarAbs(SkScalarInvert(scale)); if (inv > 32767) { // Watch out for SkFixed overflow. @@ -241,17 +240,29 @@ static SkFixed compute_level(SkScalar scale) { SkASSERT(clz >= 1 && clz <= 15); return SkIntToFixed(15 - clz) + ((unsigned)(s << (clz + 1)) >> 16); } +#endif bool SkMipMap::extractLevel(SkScalar scale, Level* levelPtr) const { if (NULL == fLevels) { return false; } - if (scale >= SK_Scalar1) { + if (scale >= SK_Scalar1 || scale <= 0 || !SkScalarIsFinite(scale)) { return false; } +#ifdef SK_SUPPORT_LEGACY_MIPLEVELCHOICE int level = compute_level(scale) >> 16; +#else + SkScalar L = -SkScalarLog2(scale); + if (!SkScalarIsFinite(L)) { + return false; + } + SkASSERT(L >= 0); + int level = SkScalarRoundToInt(L); +// SkDebugf("mipmap scale=%g L=%g level=%d\n", scale, L, level); +#endif + SkASSERT(level >= 0); if (level <= 0) { return false; |