| * Copyright 2008 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. |
| #ifndef SkUnPreMultiply_DEFINED |
| #define SkUnPreMultiply_DEFINED |
| class SK_API SkUnPreMultiply { |
| // index this table with alpha [0..255] |
| static const Scale* GetScaleTable() { |
| static Scale GetScale(U8CPU alpha) { |
| const Scale* table = SkUnPreMultiply::GetScaleTable(); |
| SkUnPreMultiply::Scale scale = table[a]; |
| red = SkUnPreMultiply::ApplyScale(scale, red); |
| // now red is unpremultiplied |
| static U8CPU ApplyScale(Scale scale, U8CPU component) { |
| SkASSERT(component <= 255); |
| return (scale * component + (1 << 23)) >> 24; |
| static SkColor PMColorToColor(SkPMColor c); |
| static const uint32_t gTable[256]; |