1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/effects/SkLerpXfermode.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,111 @@
1.4 +/*
1.5 + * Copyright 2013 Google Inc.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license that can be
1.8 + * found in the LICENSE file.
1.9 + */
1.10 +
1.11 +#include "SkLerpXfermode.h"
1.12 +#include "SkColorPriv.h"
1.13 +#include "SkReadBuffer.h"
1.14 +#include "SkWriteBuffer.h"
1.15 +#include "SkString.h"
1.16 +
1.17 +SkXfermode* SkLerpXfermode::Create(SkScalar scale) {
1.18 + int scale256 = SkScalarRoundToInt(scale * 256);
1.19 + if (scale256 >= 256) {
1.20 + return SkXfermode::Create(SkXfermode::kSrc_Mode);
1.21 + } else if (scale256 <= 0) {
1.22 + return SkXfermode::Create(SkXfermode::kDst_Mode);
1.23 + }
1.24 + return SkNEW_ARGS(SkLerpXfermode, (scale256));
1.25 +}
1.26 +
1.27 +SkLerpXfermode::SkLerpXfermode(unsigned scale256) : fScale256(scale256) {}
1.28 +
1.29 +SkLerpXfermode::SkLerpXfermode(SkReadBuffer& buffer)
1.30 + : INHERITED(buffer) {
1.31 + fScale256 = buffer.readUInt();
1.32 +}
1.33 +
1.34 +void SkLerpXfermode::flatten(SkWriteBuffer& buffer) const {
1.35 + this->INHERITED::flatten(buffer);
1.36 + buffer.writeUInt(fScale256);
1.37 +}
1.38 +
1.39 +void SkLerpXfermode::xfer32(SkPMColor dst[], const SkPMColor src[], int count,
1.40 + const SkAlpha aa[]) const {
1.41 + const int scale = fScale256;
1.42 +
1.43 + if (aa) {
1.44 + for (int i = 0; i < count; ++i) {
1.45 + unsigned a = aa[i];
1.46 + if (a) {
1.47 + SkPMColor dstC = dst[i];
1.48 + SkPMColor resC = SkFastFourByteInterp256(src[i], dstC, scale);
1.49 + if (a < 255) {
1.50 + resC = SkFastFourByteInterp256(resC, dstC, a + (a >> 7));
1.51 + }
1.52 + dst[i] = resC;
1.53 + }
1.54 + }
1.55 + } else {
1.56 + for (int i = 0; i < count; ++i) {
1.57 + dst[i] = SkFastFourByteInterp256(src[i], dst[i], scale);
1.58 + }
1.59 + }
1.60 +}
1.61 +
1.62 +void SkLerpXfermode::xfer16(uint16_t dst[], const SkPMColor src[], int count,
1.63 + const SkAlpha aa[]) const {
1.64 + const int scale = fScale256;
1.65 +
1.66 + if (aa) {
1.67 + for (int i = 0; i < count; ++i) {
1.68 + unsigned a = aa[i];
1.69 + if (a) {
1.70 + SkPMColor dstC = SkPixel16ToPixel32(dst[i]);
1.71 + SkPMColor resC = SkFastFourByteInterp256(src[i], dstC, scale);
1.72 + if (a < 255) {
1.73 + resC = SkFastFourByteInterp256(resC, dstC, a + (a >> 7));
1.74 + }
1.75 + dst[i] = SkPixel32ToPixel16(resC);
1.76 + }
1.77 + }
1.78 + } else {
1.79 + for (int i = 0; i < count; ++i) {
1.80 + SkPMColor dstC = SkPixel16ToPixel32(dst[i]);
1.81 + SkPMColor resC = SkFastFourByteInterp256(src[i], dstC, scale);
1.82 + dst[i] = SkPixel32ToPixel16(resC);
1.83 + }
1.84 + }
1.85 +}
1.86 +
1.87 +void SkLerpXfermode::xferA8(SkAlpha dst[], const SkPMColor src[], int count,
1.88 + const SkAlpha aa[]) const {
1.89 + const int scale = fScale256;
1.90 +
1.91 + if (aa) {
1.92 + for (int i = 0; i < count; ++i) {
1.93 + unsigned a = aa[i];
1.94 + if (a) {
1.95 + unsigned dstA = dst[i];
1.96 + unsigned resA = SkAlphaBlend(SkGetPackedA32(src[i]), dstA, scale);
1.97 + if (a < 255) {
1.98 + resA = SkAlphaBlend(resA, dstA, a + (a >> 7));
1.99 + }
1.100 + dst[i] = resA;
1.101 + }
1.102 + }
1.103 + } else {
1.104 + for (int i = 0; i < count; ++i) {
1.105 + dst[i] = SkAlphaBlend(SkGetPackedA32(src[i]), dst[i], scale);
1.106 + }
1.107 + }
1.108 +}
1.109 +
1.110 +#ifndef SK_IGNORE_TO_STRING
1.111 +void SkLerpXfermode::toString(SkString* str) const {
1.112 + str->printf("SkLerpXfermode: scale: %g", fScale256 / 256.0);
1.113 +}
1.114 +#endif
