73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
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/*
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Copyright 2010 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#ifndef GrColor_DEFINED
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#define GrColor_DEFINED
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#include "GrTypes.h"
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/**
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* GrColor is 4 bytes for R, G, B, A, in a compile-time specific order. The
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* components are stored premultiplied.
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*/
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typedef uint32_t GrColor;
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// indices for address a GrColor as an array of bytes
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#define GrColor_INDEX_R 0
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#define GrColor_INDEX_G 1
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#define GrColor_INDEX_B 2
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#define GrColor_INDEX_A 3
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// shfit amount to assign a component to a GrColor int
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#define GrColor_SHIFT_R 0
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#define GrColor_SHIFT_G 8
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#define GrColor_SHIFT_B 16
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#define GrColor_SHIFT_A 24
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/**
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* Pack 4 components (RGBA) into a GrColor int
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*/
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static inline GrColor GrColorPackRGBA(unsigned r, unsigned g,
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unsigned b, unsigned a) {
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GrAssert((uint8_t)r == r);
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GrAssert((uint8_t)g == g);
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GrAssert((uint8_t)b == b);
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GrAssert((uint8_t)a == a);
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return (r << GrColor_SHIFT_R) |
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(g << GrColor_SHIFT_G) |
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(b << GrColor_SHIFT_B) |
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(a << GrColor_SHIFT_A);
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}
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// extract a component (byte) from a GrColor int
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#define GrColorUnpackR(color) (((color) >> GrColor_SHIFT_R) & 0xFF)
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#define GrColorUnpackG(color) (((color) >> GrColor_SHIFT_G) & 0xFF)
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#define GrColorUnpackB(color) (((color) >> GrColor_SHIFT_B) & 0xFF)
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#define GrColorUnpackA(color) (((color) >> GrColor_SHIFT_A) & 0xFF)
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/**
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* Since premultiplied means that alpha >= color, we construct a color with
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* each component==255 and alpha == 0 to be "illegal"
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*/
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#define GrColor_ILLEGAL (~(0xFF << GrColor_SHIFT_A))
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#endif
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