diff options
| author |  herb <herb@google.com> | 2016-07-12 15:00:46 -0700 |
|---|---|---|
| committer |  Commit bot <commit-bot@chromium.org> | 2016-07-12 15:00:46 -0700 |
| commit | 2edf0c6a719b8dff4365628cf3b4481c5035f07a (patch) | |
| tree | 63fa587c2ed531dac43652d94bb098bdedf1afb4 /src/core/SkPM4fPriv.h | |
| parent | 7d3ff7142360f456be4e21e64c6c014cc919785e (diff) | |
Remove bloat from SkBlend_opts.
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2130183003
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
Review-Url: https://codereview.chromium.org/2130183003
Diffstat (limited to 'src/core/SkPM4fPriv.h')
| -rw-r--r-- | src/core/SkPM4fPriv.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/src/core/SkPM4fPriv.h b/src/core/SkPM4fPriv.h index fa5498f90a..57a44c1cb2 100644 --- a/src/core/SkPM4fPriv.h +++ b/src/core/SkPM4fPriv.h @@ -124,4 +124,28 @@ static inline uint32_t exact_Sk4f_toS32(const Sk4f& x4) { return to_4b(exact_linear_to_srgb(x4) * Sk4f(255) + Sk4f(0.5f)); } +//////////////////////////////////////////////////////////////////////////////////////////////////// +// An implementation of SrcOver from bytes to bytes in linear space that takes advantage of the +// observation that the 255's cancel. +// invA = 1 - (As / 255); +// +// R = 255 * sqrt((Rs/255)^2 + (Rd/255)^2 * invA) +// => R = 255 * sqrt((Rs^2 + Rd^2 * invA)/255^2) +// => R = sqrt(Rs^2 + Rd^2 * invA) +// Note: src is assumed to be linear. +static inline void srcover_blend_srgb8888_srgb_1(uint32_t* dst, const Sk4f& src) { + Sk4f d = srgb_to_linear(to_4f(*dst)); + Sk4f invAlpha = 1.0f - Sk4f{src[SkPM4f::A]} * (1.0f / 255.0f); + Sk4f r = linear_to_srgb(src + d * invAlpha) + 0.5f; + *dst = to_4b(r); +} + +static inline void srcover_srgb8888_srgb_1(uint32_t* dst, const uint32_t pixel) { + if ((~pixel & 0xFF000000) == 0) { + *dst = pixel; + } else if ((pixel & 0xFF000000) != 0) { + srcover_blend_srgb8888_srgb_1(dst, srgb_to_linear(to_4f(pixel))); + } +} + #endif |