44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
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/*
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* Copyright 2017 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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#ifndef SkUnPreMultiplyPriv_DEFINED
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#define SkUnPreMultiplyPriv_DEFINED
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#include "SkColor.h"
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template <bool kSwapRB>
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void SkUnpremultiplyRow(uint32_t* dst, const uint32_t* src, int count) {
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const SkUnPreMultiply::Scale* table = SkUnPreMultiply::GetScaleTable();
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for (int i = 0; i < count; i++) {
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uint32_t c = *src++;
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uint8_t r, g, b, a;
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if (kSwapRB) {
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r = (c >> 16) & 0xFF;
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g = (c >> 8) & 0xFF;
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b = (c >> 0) & 0xFF;
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a = (c >> 24) & 0xFF;
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} else {
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r = (c >> 0) & 0xFF;
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g = (c >> 8) & 0xFF;
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b = (c >> 16) & 0xFF;
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a = (c >> 24) & 0xFF;
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}
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if (0 != a && 255 != a) {
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SkUnPreMultiply::Scale scale = table[a];
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r = SkUnPreMultiply::ApplyScale(scale, r);
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g = SkUnPreMultiply::ApplyScale(scale, g);
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b = SkUnPreMultiply::ApplyScale(scale, b);
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}
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*dst++ = (r << 0) | (g << 8) | (b << 16) | (a << 24);
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}
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}
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#endif
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