diff options
Diffstat (limited to 'src/opts/SkPMFloat_neon.h')
-rw-r--r-- | src/opts/SkPMFloat_neon.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/src/opts/SkPMFloat_neon.h b/src/opts/SkPMFloat_neon.h new file mode 100644 index 0000000000..f3d265573d --- /dev/null +++ b/src/opts/SkPMFloat_neon.h @@ -0,0 +1,42 @@ +#include "SkColorPriv.h" +#include "SkPMFloat.h" +#include <arm_neon.h> + +// For set(), we widen our 8 bit components (fix8) to 8-bit components in 16 bits (fix8_16), +// then widen those to 8-bit-in-32-bits (fix8_32), convert those to floats (scaled), +// then finally scale those down from [0.0f, 255.0f] to [0.0f, 1.0f] into fColor. + +// get() and clamped() do the opposite, working from [0.0f, 1.0f] floats to [0.0f, 255.0f], +// to 8-bit-in-32-bit, to 8-bit-in-16-bit, back down to 8-bit components. +// clamped() uses vqmovn to clamp while narrowing instead of just narrowing with vmovn. + +inline void SkPMFloat::set(SkPMColor c) { + SkPMColorAssert(c); + uint8x8_t fix8 = (uint8x8_t)vdup_n_u32(c); + uint16x8_t fix8_16 = vmovl_u8(fix8); + uint32x4_t fix8_32 = vmovl_u16(vget_low_u16(fix8_16)); + float32x4_t scaled = vcvtq_f32_u32(fix8_32); + vst1q_f32(fColor, vmulq_f32(scaled, vdupq_n_f32(1.0f/255.0f))); + SkASSERT(this->isValid()); +} + +inline SkPMColor SkPMFloat::get() const { + SkASSERT(this->isValid()); + float32x4_t scaled = vmulq_f32(vld1q_f32(fColor), vdupq_n_f32(255.0f)); + uint32x4_t fix8_32 = vcvtq_u32_f32(scaled); + uint16x4_t fix8_16 = vmovn_u32(fix8_32); + uint8x8_t fix8 = vmovn_u16(vcombine_u16(fix8_16, vdup_n_u16(0))); + SkPMColor c = vget_lane_u32((uint32x2_t)fix8, 0); + SkPMColorAssert(c); + return c; +} + +inline SkPMColor SkPMFloat::clamped() const { + float32x4_t scaled = vmulq_f32(vld1q_f32(fColor), vdupq_n_f32(255.0f)); + uint32x4_t fix8_32 = vcvtq_u32_f32(scaled); + uint16x4_t fix8_16 = vqmovn_u32(fix8_32); + uint8x8_t fix8 = vqmovn_u16(vcombine_u16(fix8_16, vdup_n_u16(0))); + SkPMColor c = vget_lane_u32((uint32x2_t)fix8, 0); + SkPMColorAssert(c); + return c; +} |