| /* |
| * Copyright 2006 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 "include/core/SkColor.h" |
| #include "include/private/SkColorData.h" |
| #include "include/private/SkFixed.h" |
| |
| SkPMColor SkPreMultiplyARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b) { |
| return SkPremultiplyARGBInline(a, r, g, b); |
| } |
| |
| SkPMColor SkPreMultiplyColor(SkColor c) { |
| return SkPremultiplyARGBInline(SkColorGetA(c), SkColorGetR(c), |
| SkColorGetG(c), SkColorGetB(c)); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| static inline SkScalar ByteToScalar(U8CPU x) { |
| SkASSERT(x <= 255); |
| return SkIntToScalar(x) / 255; |
| } |
| |
| static inline SkScalar ByteDivToScalar(int numer, U8CPU denom) { |
| // cast to keep the answer signed |
| return SkIntToScalar(numer) / (int)denom; |
| } |
| |
| void SkRGBToHSV(U8CPU r, U8CPU g, U8CPU b, SkScalar hsv[3]) { |
| SkASSERT(hsv); |
| |
| unsigned min = SkMin32(r, SkMin32(g, b)); |
| unsigned max = SkMax32(r, SkMax32(g, b)); |
| unsigned delta = max - min; |
| |
| SkScalar v = ByteToScalar(max); |
| SkASSERT(v >= 0 && v <= SK_Scalar1); |
| |
| if (0 == delta) { // we're a shade of gray |
| hsv[0] = 0; |
| hsv[1] = 0; |
| hsv[2] = v; |
| return; |
| } |
| |
| SkScalar s = ByteDivToScalar(delta, max); |
| SkASSERT(s >= 0 && s <= SK_Scalar1); |
| |
| SkScalar h; |
| if (r == max) { |
| h = ByteDivToScalar(g - b, delta); |
| } else if (g == max) { |
| h = SkIntToScalar(2) + ByteDivToScalar(b - r, delta); |
| } else { // b == max |
| h = SkIntToScalar(4) + ByteDivToScalar(r - g, delta); |
| } |
| |
| h *= 60; |
| if (h < 0) { |
| h += SkIntToScalar(360); |
| } |
| SkASSERT(h >= 0 && h < SkIntToScalar(360)); |
| |
| hsv[0] = h; |
| hsv[1] = s; |
| hsv[2] = v; |
| } |
| |
| SkColor SkHSVToColor(U8CPU a, const SkScalar hsv[3]) { |
| SkASSERT(hsv); |
| |
| SkScalar s = SkScalarPin(hsv[1], 0, 1); |
| SkScalar v = SkScalarPin(hsv[2], 0, 1); |
| |
| U8CPU v_byte = SkScalarRoundToInt(v * 255); |
| |
| if (SkScalarNearlyZero(s)) { // shade of gray |
| return SkColorSetARGB(a, v_byte, v_byte, v_byte); |
| } |
| SkScalar hx = (hsv[0] < 0 || hsv[0] >= SkIntToScalar(360)) ? 0 : hsv[0]/60; |
| SkScalar w = SkScalarFloorToScalar(hx); |
| SkScalar f = hx - w; |
| |
| unsigned p = SkScalarRoundToInt((SK_Scalar1 - s) * v * 255); |
| unsigned q = SkScalarRoundToInt((SK_Scalar1 - (s * f)) * v * 255); |
| unsigned t = SkScalarRoundToInt((SK_Scalar1 - (s * (SK_Scalar1 - f))) * v * 255); |
| |
| unsigned r, g, b; |
| |
| SkASSERT((unsigned)(w) < 6); |
| switch ((unsigned)(w)) { |
| case 0: r = v_byte; g = t; b = p; break; |
| case 1: r = q; g = v_byte; b = p; break; |
| case 2: r = p; g = v_byte; b = t; break; |
| case 3: r = p; g = q; b = v_byte; break; |
| case 4: r = t; g = p; b = v_byte; break; |
| default: r = v_byte; g = p; b = q; break; |
| } |
| return SkColorSetARGB(a, r, g, b); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| template <> |
| SkColor4f SkColor4f::FromColor(SkColor bgra) { |
| SkColor4f rgba; |
| swizzle_rb(Sk4f_fromL32(bgra)).store(rgba.vec()); |
| return rgba; |
| } |
| |
| template <> |
| SkColor SkColor4f::toSkColor() const { |
| return Sk4f_toL32(swizzle_rb(Sk4f::Load(this->vec()))); |
| } |
| |
| template <> |
| uint32_t SkColor4f::toBytes_RGBA() const { |
| return Sk4f_toL32(Sk4f::Load(this->vec())); |
| } |
| |
| template <> |
| SkColor4f SkColor4f::FromBytes_RGBA(uint32_t c) { |
| SkColor4f color; |
| Sk4f_fromL32(c).store(&color); |
| return color; |
| } |
| |
| template <> |
| SkPMColor4f SkPMColor4f::FromPMColor(SkPMColor c) { |
| SkPMColor4f color; |
| swizzle_rb_if_bgra(Sk4f_fromL32(c)).store(&color); |
| return color; |
| } |
| |
| template <> |
| uint32_t SkPMColor4f::toBytes_RGBA() const { |
| return Sk4f_toL32(Sk4f::Load(this->vec())); |
| } |
| |
| template <> |
| SkPMColor4f SkPMColor4f::FromBytes_RGBA(uint32_t c) { |
| SkPMColor4f color; |
| Sk4f_fromL32(c).store(&color); |
| return color; |
| } |