c0bd9f9fe5
Current strategy: everything from the top
Things to look at first are the manual changes:
- added tools/rewrite_includes.py
- removed -Idirectives from BUILD.gn
- various compile.sh simplifications
- tweak tools/embed_resources.py
- update gn/find_headers.py to write paths from the top
- update gn/gn_to_bp.py SkUserConfig.h layout
so that #include "include/config/SkUserConfig.h" always
gets the header we want.
No-Presubmit: true
Change-Id: I73a4b181654e0e38d229bc456c0d0854bae3363e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/209706
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Hal Canary <halcanary@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
98 lines
2.6 KiB
C++
98 lines
2.6 KiB
C++
/*
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* Copyright 2014 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "include/private/SkFloatBits.h"
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#include "include/private/SkHalf.h"
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uint16_t halfMantissa(SkHalf h) {
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return h & 0x03ff;
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}
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uint16_t halfExponent(SkHalf h) {
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return (h >> 10) & 0x001f;
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}
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uint16_t halfSign(SkHalf h) {
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return h >> 15;
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}
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union FloatUIntUnion {
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uint32_t fUInt; // this must come first for the initializations below to work
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float fFloat;
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};
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// based on Fabien Giesen's float_to_half_fast3()
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// see https://gist.github.com/rygorous/2156668
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SkHalf SkFloatToHalf(float f) {
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static const uint32_t f32infty = { 255 << 23 };
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static const uint32_t f16infty = { 31 << 23 };
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static const FloatUIntUnion magic = { 15 << 23 };
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static const uint32_t sign_mask = 0x80000000u;
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static const uint32_t round_mask = ~0xfffu;
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SkHalf o = 0;
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FloatUIntUnion floatUnion;
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floatUnion.fFloat = f;
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uint32_t sign = floatUnion.fUInt & sign_mask;
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floatUnion.fUInt ^= sign;
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// NOTE all the integer compares in this function can be safely
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// compiled into signed compares since all operands are below
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// 0x80000000. Important if you want fast straight SSE2 code
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// (since there's no unsigned PCMPGTD).
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// Inf or NaN (all exponent bits set)
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if (floatUnion.fUInt >= f32infty)
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// NaN->qNaN and Inf->Inf
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o = (floatUnion.fUInt > f32infty) ? 0x7e00 : 0x7c00;
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// (De)normalized number or zero
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else {
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floatUnion.fUInt &= round_mask;
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floatUnion.fFloat *= magic.fFloat;
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floatUnion.fUInt -= round_mask;
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// Clamp to signed infinity if overflowed
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if (floatUnion.fUInt > f16infty) {
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floatUnion.fUInt = f16infty;
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}
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o = floatUnion.fUInt >> 13; // Take the bits!
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}
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o |= sign >> 16;
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return o;
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}
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// based on Fabien Giesen's half_to_float_fast2()
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// see https://fgiesen.wordpress.com/2012/03/28/half-to-float-done-quic/
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float SkHalfToFloat(SkHalf h) {
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static const FloatUIntUnion magic = { 126 << 23 };
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FloatUIntUnion o;
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if (halfExponent(h) == 0)
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{
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// Zero / Denormal
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o.fUInt = magic.fUInt + halfMantissa(h);
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o.fFloat -= magic.fFloat;
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}
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else
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{
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// Set mantissa
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o.fUInt = halfMantissa(h) << 13;
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// Set exponent
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if (halfExponent(h) == 0x1f)
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// Inf/NaN
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o.fUInt |= (255 << 23);
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else
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o.fUInt |= ((127 - 15 + halfExponent(h)) << 23);
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}
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// Set sign
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o.fUInt |= (halfSign(h) << 31);
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return o.fFloat;
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}
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