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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).
*/
static inline void Filter_32_opaque(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(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);
}
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