3 * Copyright 2010 Google Inc.
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
11 #ifndef GrColor_DEFINED
12 #define GrColor_DEFINED
14 #include "include/core/SkColor.h"
15 #include "include/core/SkColorPriv.h"
16 #include "include/gpu/GrTypes.h"
17 #include "include/private/SkColorData.h"
18 #include "include/private/SkHalf.h"
19 #include "src/gpu/BufferWriter.h"
22 * GrColor is 4 bytes for R, G, B, A, in a specific order defined below. Whether the color is
23 * premultiplied or not depends on the context in which it is being used.
25 typedef uint32_t GrColor;
27 // shift amount to assign a component to a GrColor int
28 // These shift values are chosen for compatibility with GL attrib arrays
29 // ES doesn't allow BGRA vertex attrib order so if they were not in this order
30 // we'd have to swizzle in shaders.
32 #define GrColor_SHIFT_R 24
33 #define GrColor_SHIFT_G 16
34 #define GrColor_SHIFT_B 8
35 #define GrColor_SHIFT_A 0
37 #define GrColor_SHIFT_R 0
38 #define GrColor_SHIFT_G 8
39 #define GrColor_SHIFT_B 16
40 #define GrColor_SHIFT_A 24
44 * Pack 4 components (RGBA) into a GrColor int
46 static inline GrColor GrColorPackRGBA(unsigned r, unsigned g, unsigned b, unsigned a) {
47 SkASSERT((uint8_t)r == r);
48 SkASSERT((uint8_t)g == g);
49 SkASSERT((uint8_t)b == b);
50 SkASSERT((uint8_t)a == a);
51 return (r << GrColor_SHIFT_R) |
52 (g << GrColor_SHIFT_G) |
53 (b << GrColor_SHIFT_B) |
54 (a << GrColor_SHIFT_A);
57 // extract a component (byte) from a GrColor int
59 #define GrColorUnpackR(color) (((color) >> GrColor_SHIFT_R) & 0xFF)
60 #define GrColorUnpackG(color) (((color) >> GrColor_SHIFT_G) & 0xFF)
61 #define GrColorUnpackB(color) (((color) >> GrColor_SHIFT_B) & 0xFF)
62 #define GrColorUnpackA(color) (((color) >> GrColor_SHIFT_A) & 0xFF)
65 * Since premultiplied means that alpha >= color, we construct a color with
66 * each component==255 and alpha == 0 to be "illegal"
68 #define GrColor_ILLEGAL (~(0xFF << GrColor_SHIFT_A))
70 /** Normalizes and coverts an uint8_t to a float. [0, 255] -> [0.0, 1.0] */
71 static inline float GrNormalizeByteToFloat(uint8_t value) {
72 static const float ONE_OVER_255 = 1.f / 255.f;
73 return value * ONE_OVER_255;
76 /** Used to pick vertex attribute types. */
77 static inline bool SkPMColor4fFitsInBytes(const SkPMColor4f& color) {
78 // Might want to instead check that the components are [0...a] instead of [0...1]?
79 return color.fitsInBytes();
82 static inline uint64_t SkPMColor4f_toFP16(const SkPMColor4f& color) {
84 SkFloatToHalf_finite_ftz(skvx::float4::Load(color.vec())).store(&halfColor);