5a4f2a341a
This reverts commit 52065473ee.
Reason for revert: Typo messed up LCD blending
Original change's description:
> Use float colors for blend constant
>
> Bug: skia:
> Change-Id: Ie2a4b341a5e7762c3e8031fbd0f0d8b1ebae27f1
> Reviewed-on: https://skia-review.googlesource.com/c/168268
> Commit-Queue: Brian Osman <brianosman@google.com>
> Reviewed-by: Mike Klein <mtklein@google.com>
TBR=egdaniel@google.com,mtklein@google.com,bsalomon@google.com,brianosman@google.com
Change-Id: Ieaad5724099e18727296ce312d728a1a9ed45c4b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/c/168362
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
145 lines
4.4 KiB
C
145 lines
4.4 KiB
C
|
|
/*
|
|
* Copyright 2010 Google Inc.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
|
|
|
|
#ifndef GrColor_DEFINED
|
|
#define GrColor_DEFINED
|
|
|
|
#include "GrTypes.h"
|
|
#include "SkColor.h"
|
|
#include "SkColorPriv.h"
|
|
#include "SkUnPreMultiply.h"
|
|
|
|
/**
|
|
* GrColor is 4 bytes for R, G, B, A, in a specific order defined below. Whether the color is
|
|
* premultiplied or not depends on the context in which it is being used.
|
|
*/
|
|
typedef uint32_t GrColor;
|
|
|
|
// shift amount to assign a component to a GrColor int
|
|
// These shift values are chosen for compatibility with GL attrib arrays
|
|
// ES doesn't allow BGRA vertex attrib order so if they were not in this order
|
|
// we'd have to swizzle in shaders.
|
|
#ifdef SK_CPU_BENDIAN
|
|
#define GrColor_SHIFT_R 24
|
|
#define GrColor_SHIFT_G 16
|
|
#define GrColor_SHIFT_B 8
|
|
#define GrColor_SHIFT_A 0
|
|
#else
|
|
#define GrColor_SHIFT_R 0
|
|
#define GrColor_SHIFT_G 8
|
|
#define GrColor_SHIFT_B 16
|
|
#define GrColor_SHIFT_A 24
|
|
#endif
|
|
|
|
/**
|
|
* Pack 4 components (RGBA) into a GrColor int
|
|
*/
|
|
static inline GrColor GrColorPackRGBA(unsigned r, unsigned g, unsigned b, unsigned a) {
|
|
SkASSERT((uint8_t)r == r);
|
|
SkASSERT((uint8_t)g == g);
|
|
SkASSERT((uint8_t)b == b);
|
|
SkASSERT((uint8_t)a == a);
|
|
return (r << GrColor_SHIFT_R) |
|
|
(g << GrColor_SHIFT_G) |
|
|
(b << GrColor_SHIFT_B) |
|
|
(a << GrColor_SHIFT_A);
|
|
}
|
|
|
|
/**
|
|
* Packs a color with an alpha channel replicated across all four channels.
|
|
*/
|
|
static inline GrColor GrColorPackA4(unsigned a) {
|
|
SkASSERT((uint8_t)a == a);
|
|
return (a << GrColor_SHIFT_R) |
|
|
(a << GrColor_SHIFT_G) |
|
|
(a << GrColor_SHIFT_B) |
|
|
(a << GrColor_SHIFT_A);
|
|
}
|
|
|
|
// extract a component (byte) from a GrColor int
|
|
|
|
#define GrColorUnpackR(color) (((color) >> GrColor_SHIFT_R) & 0xFF)
|
|
#define GrColorUnpackG(color) (((color) >> GrColor_SHIFT_G) & 0xFF)
|
|
#define GrColorUnpackB(color) (((color) >> GrColor_SHIFT_B) & 0xFF)
|
|
#define GrColorUnpackA(color) (((color) >> GrColor_SHIFT_A) & 0xFF)
|
|
|
|
/**
|
|
* Since premultiplied means that alpha >= color, we construct a color with
|
|
* each component==255 and alpha == 0 to be "illegal"
|
|
*/
|
|
#define GrColor_ILLEGAL (~(0xFF << GrColor_SHIFT_A))
|
|
|
|
#define GrColor_WHITE 0xFFFFFFFF
|
|
#define GrColor_TRANSPARENT_BLACK 0x0
|
|
|
|
/**
|
|
* Assert in debug builds that a GrColor is premultiplied.
|
|
*/
|
|
static inline void GrColorIsPMAssert(GrColor SkDEBUGCODE(c)) {
|
|
#ifdef SK_DEBUG
|
|
unsigned a = GrColorUnpackA(c);
|
|
unsigned r = GrColorUnpackR(c);
|
|
unsigned g = GrColorUnpackG(c);
|
|
unsigned b = GrColorUnpackB(c);
|
|
|
|
SkASSERT(r <= a);
|
|
SkASSERT(g <= a);
|
|
SkASSERT(b <= a);
|
|
#endif
|
|
}
|
|
|
|
static inline GrColor GrColorMul(GrColor c0, GrColor c1) {
|
|
U8CPU r = SkMulDiv255Round(GrColorUnpackR(c0), GrColorUnpackR(c1));
|
|
U8CPU g = SkMulDiv255Round(GrColorUnpackG(c0), GrColorUnpackG(c1));
|
|
U8CPU b = SkMulDiv255Round(GrColorUnpackB(c0), GrColorUnpackB(c1));
|
|
U8CPU a = SkMulDiv255Round(GrColorUnpackA(c0), GrColorUnpackA(c1));
|
|
return GrColorPackRGBA(r, g, b, a);
|
|
}
|
|
|
|
/** Converts a GrColor to an rgba array of GrGLfloat */
|
|
static inline void GrColorToRGBAFloat(GrColor color, float rgba[4]) {
|
|
static const float ONE_OVER_255 = 1.f / 255.f;
|
|
rgba[0] = GrColorUnpackR(color) * ONE_OVER_255;
|
|
rgba[1] = GrColorUnpackG(color) * ONE_OVER_255;
|
|
rgba[2] = GrColorUnpackB(color) * ONE_OVER_255;
|
|
rgba[3] = GrColorUnpackA(color) * ONE_OVER_255;
|
|
}
|
|
|
|
/** Normalizes and coverts an uint8_t to a float. [0, 255] -> [0.0, 1.0] */
|
|
static inline float GrNormalizeByteToFloat(uint8_t value) {
|
|
static const float ONE_OVER_255 = 1.f / 255.f;
|
|
return value * ONE_OVER_255;
|
|
}
|
|
|
|
/** Determines whether the color is opaque or not. */
|
|
static inline bool GrColorIsOpaque(GrColor color) {
|
|
return (color & (0xFFU << GrColor_SHIFT_A)) == (0xFFU << GrColor_SHIFT_A);
|
|
}
|
|
|
|
/** Returns an unpremuled version of the GrColor. */
|
|
static inline GrColor GrUnpremulColor(GrColor color) {
|
|
GrColorIsPMAssert(color);
|
|
unsigned r = GrColorUnpackR(color);
|
|
unsigned g = GrColorUnpackG(color);
|
|
unsigned b = GrColorUnpackB(color);
|
|
unsigned a = GrColorUnpackA(color);
|
|
SkPMColor colorPM = SkPackARGB32(a, r, g, b);
|
|
SkColor colorUPM = SkUnPreMultiply::PMColorToColor(colorPM);
|
|
|
|
r = SkColorGetR(colorUPM);
|
|
g = SkColorGetG(colorUPM);
|
|
b = SkColorGetB(colorUPM);
|
|
a = SkColorGetA(colorUPM);
|
|
|
|
return GrColorPackRGBA(r, g, b, a);
|
|
}
|
|
|
|
#endif
|