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/*
* Copyright 2009 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkColorPriv.h"
/*
Filter_32_opaque
There is no hard-n-fast rule that the filtering must produce
exact results for the color components, but if the 4 incoming colors are
all opaque, then the output color must also be opaque. Subsequent parts of
the drawing pipeline may rely on this (e.g. which blitrow proc to use).
*/
#if defined(__ARM_HAVE_NEON) && !defined(SK_CPU_BENDIAN)
static inline void Filter_32_opaque_neon(unsigned x, unsigned y,
SkPMColor a00, SkPMColor a01,
SkPMColor a10, SkPMColor a11,
SkPMColor *dst) {
asm volatile(
"vdup.8 d0, %[y] \n\t" // duplicate y into d0
"vmov.u8 d16, #16 \n\t" // set up constant in d16
"vsub.u8 d1, d16, d0 \n\t" // d1 = 16-y
"vdup.32 d4, %[a00] \n\t" // duplicate a00 into d4
"vdup.32 d5, %[a10] \n\t" // duplicate a10 into d5
"vmov.32 d4[1], %[a01] \n\t" // set top of d4 to a01
"vmov.32 d5[1], %[a11] \n\t" // set top of d5 to a11
"vmull.u8 q3, d4, d1 \n\t" // q3 = [a01|a00] * (16-y)
"vmull.u8 q0, d5, d0 \n\t" // q0 = [a11|a10] * y
"vdup.16 d5, %[x] \n\t" // duplicate x into d5
"vmov.u16 d16, #16 \n\t" // set up constant in d16
"vsub.u16 d3, d16, d5 \n\t" // d3 = 16-x
"vmul.i16 d4, d7, d5 \n\t" // d4 = a01 * x
"vmla.i16 d4, d1, d5 \n\t" // d4 += a11 * x
"vmla.i16 d4, d6, d3 \n\t" // d4 += a00 * (16-x)
"vmla.i16 d4, d0, d3 \n\t" // d4 += a10 * (16-x)
"vshrn.i16 d0, q2, #8 \n\t" // shift down result by 8
"vst1.32 {d0[0]}, [%[dst]] \n\t" // store result
:
: [x] "r" (x), [y] "r" (y), [a00] "r" (a00), [a01] "r" (a01), [a10] "r" (a10), [a11] "r" (a11), [dst] "r" (dst)
: "cc", "memory", "r4", "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", "d16"
);
}
static inline void Filter_32_alpha_neon(unsigned x, unsigned y,
SkPMColor a00, SkPMColor a01,
SkPMColor a10, SkPMColor a11,
SkPMColor *dst, uint16_t scale) {
asm volatile(
"vdup.8 d0, %[y] \n\t" // duplicate y into d0
"vmov.u8 d16, #16 \n\t" // set up constant in d16
"vsub.u8 d1, d16, d0 \n\t" // d1 = 16-y
"vdup.32 d4, %[a00] \n\t" // duplicate a00 into d4
"vdup.32 d5, %[a10] \n\t" // duplicate a10 into d5
"vmov.32 d4[1], %[a01] \n\t" // set top of d4 to a01
"vmov.32 d5[1], %[a11] \n\t" // set top of d5 to a11
"vmull.u8 q3, d4, d1 \n\t" // q3 = [a01|a00] * (16-y)
"vmull.u8 q0, d5, d0 \n\t" // q0 = [a11|a10] * y
"vdup.16 d5, %[x] \n\t" // duplicate x into d5
"vmov.u16 d16, #16 \n\t" // set up constant in d16
"vsub.u16 d3, d16, d5 \n\t" // d3 = 16-x
"vmul.i16 d4, d7, d5 \n\t" // d4 = a01 * x
"vmla.i16 d4, d1, d5 \n\t" // d4 += a11 * x
"vmla.i16 d4, d6, d3 \n\t" // d4 += a00 * (16-x)
"vmla.i16 d4, d0, d3 \n\t" // d4 += a10 * (16-x)
"vdup.16 d3, %[scale] \n\t" // duplicate scale into d3
"vshr.u16 d4, d4, #8 \n\t" // shift down result by 8
"vmul.i16 d4, d4, d3 \n\t" // multiply result by scale
"vshrn.i16 d0, q2, #8 \n\t" // shift down result by 8
"vst1.32 {d0[0]}, [%[dst]] \n\t" // store result
:
: [x] "r" (x), [y] "r" (y), [a00] "r" (a00), [a01] "r" (a01), [a10] "r" (a10), [a11] "r" (a11), [dst] "r" (dst), [scale] "r" (scale)
: "cc", "memory", "r4", "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", "d16"
);
}
#define Filter_32_opaque Filter_32_opaque_neon
#define Filter_32_alpha Filter_32_alpha_neon
#else
static inline void Filter_32_opaque_portable(unsigned x, unsigned y,
SkPMColor a00, SkPMColor a01,
SkPMColor a10, SkPMColor a11,
SkPMColor* dstColor) {
SkASSERT((unsigned)x <= 0xF);
SkASSERT((unsigned)y <= 0xF);
int xy = x * y;
static const uint32_t mask = gMask_00FF00FF; //0xFF00FF;
int scale = 256 - 16*y - 16*x + xy;
uint32_t lo = (a00 & mask) * scale;
uint32_t hi = ((a00 >> 8) & mask) * scale;
scale = 16*x - xy;
lo += (a01 & mask) * scale;
hi += ((a01 >> 8) & mask) * scale;
scale = 16*y - xy;
lo += (a10 & mask) * scale;
hi += ((a10 >> 8) & mask) * scale;
lo += (a11 & mask) * xy;
hi += ((a11 >> 8) & mask) * xy;
*dstColor = ((lo >> 8) & mask) | (hi & ~mask);
}
static inline void Filter_32_alpha_portable(unsigned x, unsigned y,
SkPMColor a00, SkPMColor a01,
SkPMColor a10, SkPMColor a11,
SkPMColor* dstColor,
unsigned alphaScale) {
SkASSERT((unsigned)x <= 0xF);
SkASSERT((unsigned)y <= 0xF);
SkASSERT(alphaScale <= 256);
int xy = x * y;
static const uint32_t mask = gMask_00FF00FF; //0xFF00FF;
int scale = 256 - 16*y - 16*x + xy;
uint32_t lo = (a00 & mask) * scale;
uint32_t hi = ((a00 >> 8) & mask) * scale;
scale = 16*x - xy;
lo += (a01 & mask) * scale;
hi += ((a01 >> 8) & mask) * scale;
scale = 16*y - xy;
lo += (a10 & mask) * scale;
hi += ((a10 >> 8) & mask) * scale;
lo += (a11 & mask) * xy;
hi += ((a11 >> 8) & mask) * xy;
lo = ((lo >> 8) & mask) * alphaScale;
hi = ((hi >> 8) & mask) * alphaScale;
*dstColor = ((lo >> 8) & mask) | (hi & ~mask);
}
#define Filter_32_opaque Filter_32_opaque_portable
#define Filter_32_alpha Filter_32_alpha_portable
#endif
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