| /* |
| * 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 "SkColorData.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; |
| const uint32_t mask = 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; |
| const uint32_t mask = 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); |
| } |
| |
| // Two color version, where we filter only along 1 axis |
| static inline void Filter_32_opaque(unsigned t, |
| SkPMColor color0, |
| SkPMColor color1, |
| SkPMColor* dstColor) { |
| SkASSERT((unsigned)t <= 0xF); |
| |
| const uint32_t mask = 0xFF00FF; |
| |
| int scale = 256 - 16*t; |
| uint32_t lo = (color0 & mask) * scale; |
| uint32_t hi = ((color0 >> 8) & mask) * scale; |
| |
| scale = 16*t; |
| lo += (color1 & mask) * scale; |
| hi += ((color1 >> 8) & mask) * scale; |
| |
| *dstColor = ((lo >> 8) & mask) | (hi & ~mask); |
| } |
| |
| // Two color version, where we filter only along 1 axis |
| static inline void Filter_32_alpha(unsigned t, |
| SkPMColor color0, |
| SkPMColor color1, |
| SkPMColor* dstColor, |
| unsigned alphaScale) { |
| SkASSERT((unsigned)t <= 0xF); |
| SkASSERT(alphaScale <= 256); |
| |
| const uint32_t mask = 0xFF00FF; |
| |
| int scale = 256 - 16*t; |
| uint32_t lo = (color0 & mask) * scale; |
| uint32_t hi = ((color0 >> 8) & mask) * scale; |
| |
| scale = 16*t; |
| lo += (color1 & mask) * scale; |
| hi += ((color1 >> 8) & mask) * scale; |
| |
| lo = ((lo >> 8) & mask) * alphaScale; |
| hi = ((hi >> 8) & mask) * alphaScale; |
| |
| *dstColor = ((lo >> 8) & mask) | (hi & ~mask); |
| } |