The Tor Browser / file comparison
comparison: gfx/skia/trunk/src/effects/SkLerpXfermode.cpp
gfx/skia/trunk/src/effects/SkLerpXfermode.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:c5ad464a111e |
|---|---|
| 1 /* | |
| 2 * Copyright 2013 Google Inc. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 | |
| 8 #include "SkLerpXfermode.h" | |
| 9 #include "SkColorPriv.h" | |
| 10 #include "SkReadBuffer.h" | |
| 11 #include "SkWriteBuffer.h" | |
| 12 #include "SkString.h" | |
| 13 | |
| 14 SkXfermode* SkLerpXfermode::Create(SkScalar scale) { | |
| 15 int scale256 = SkScalarRoundToInt(scale * 256); | |
| 16 if (scale256 >= 256) { | |
| 17 return SkXfermode::Create(SkXfermode::kSrc_Mode); | |
| 18 } else if (scale256 <= 0) { | |
| 19 return SkXfermode::Create(SkXfermode::kDst_Mode); | |
| 20 } | |
| 21 return SkNEW_ARGS(SkLerpXfermode, (scale256)); | |
| 22 } | |
| 23 | |
| 24 SkLerpXfermode::SkLerpXfermode(unsigned scale256) : fScale256(scale256) {} | |
| 25 | |
| 26 SkLerpXfermode::SkLerpXfermode(SkReadBuffer& buffer) | |
| 27 : INHERITED(buffer) { | |
| 28 fScale256 = buffer.readUInt(); | |
| 29 } | |
| 30 | |
| 31 void SkLerpXfermode::flatten(SkWriteBuffer& buffer) const { | |
| 32 this->INHERITED::flatten(buffer); | |
| 33 buffer.writeUInt(fScale256); | |
| 34 } | |
| 35 | |
| 36 void SkLerpXfermode::xfer32(SkPMColor dst[], const SkPMColor src[], int count, | |
| 37 const SkAlpha aa[]) const { | |
| 38 const int scale = fScale256; | |
| 39 | |
| 40 if (aa) { | |
| 41 for (int i = 0; i < count; ++i) { | |
| 42 unsigned a = aa[i]; | |
| 43 if (a) { | |
| 44 SkPMColor dstC = dst[i]; | |
| 45 SkPMColor resC = SkFastFourByteInterp256(src[i], dstC, scale); | |
| 46 if (a < 255) { | |
| 47 resC = SkFastFourByteInterp256(resC, dstC, a + (a >> 7)); | |
| 48 } | |
| 49 dst[i] = resC; | |
| 50 } | |
| 51 } | |
| 52 } else { | |
| 53 for (int i = 0; i < count; ++i) { | |
| 54 dst[i] = SkFastFourByteInterp256(src[i], dst[i], scale); | |
| 55 } | |
| 56 } | |
| 57 } | |
| 58 | |
| 59 void SkLerpXfermode::xfer16(uint16_t dst[], const SkPMColor src[], int count, | |
| 60 const SkAlpha aa[]) const { | |
| 61 const int scale = fScale256; | |
| 62 | |
| 63 if (aa) { | |
| 64 for (int i = 0; i < count; ++i) { | |
| 65 unsigned a = aa[i]; | |
| 66 if (a) { | |
| 67 SkPMColor dstC = SkPixel16ToPixel32(dst[i]); | |
| 68 SkPMColor resC = SkFastFourByteInterp256(src[i], dstC, scale); | |
| 69 if (a < 255) { | |
| 70 resC = SkFastFourByteInterp256(resC, dstC, a + (a >> 7)); | |
| 71 } | |
| 72 dst[i] = SkPixel32ToPixel16(resC); | |
| 73 } | |
| 74 } | |
| 75 } else { | |
| 76 for (int i = 0; i < count; ++i) { | |
| 77 SkPMColor dstC = SkPixel16ToPixel32(dst[i]); | |
| 78 SkPMColor resC = SkFastFourByteInterp256(src[i], dstC, scale); | |
| 79 dst[i] = SkPixel32ToPixel16(resC); | |
| 80 } | |
| 81 } | |
| 82 } | |
| 83 | |
| 84 void SkLerpXfermode::xferA8(SkAlpha dst[], const SkPMColor src[], int count, | |
| 85 const SkAlpha aa[]) const { | |
| 86 const int scale = fScale256; | |
| 87 | |
| 88 if (aa) { | |
| 89 for (int i = 0; i < count; ++i) { | |
| 90 unsigned a = aa[i]; | |
| 91 if (a) { | |
| 92 unsigned dstA = dst[i]; | |
| 93 unsigned resA = SkAlphaBlend(SkGetPackedA32(src[i]), dstA, scale); | |
| 94 if (a < 255) { | |
| 95 resA = SkAlphaBlend(resA, dstA, a + (a >> 7)); | |
| 96 } | |
| 97 dst[i] = resA; | |
| 98 } | |
| 99 } | |
| 100 } else { | |
| 101 for (int i = 0; i < count; ++i) { | |
| 102 dst[i] = SkAlphaBlend(SkGetPackedA32(src[i]), dst[i], scale); | |
| 103 } | |
| 104 } | |
| 105 } | |
| 106 | |
| 107 #ifndef SK_IGNORE_TO_STRING | |
| 108 void SkLerpXfermode::toString(SkString* str) const { | |
| 109 str->printf("SkLerpXfermode: scale: %g", fScale256 / 256.0); | |
| 110 } | |
| 111 #endif |
