epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 1 | |
| 2 | /* |
| 3 | * Copyright 2011 Google Inc. |
| 4 | * |
| 5 | * Use of this source code is governed by a BSD-style license that can be |
| 6 | * found in the LICENSE file. |
| 7 | */ |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 8 | #include "SkBlurDrawLooper.h" |
| 9 | #include "SkBlurMaskFilter.h" |
| 10 | #include "SkCanvas.h" |
| 11 | #include "SkPaint.h" |
| 12 | #include "SkMaskFilter.h" |
senorblanco@chromium.org | 4868e6b | 2011-02-18 19:03:01 +0000 | [diff] [blame] | 13 | #include "SkColorFilter.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 14 | |
| 15 | SkBlurDrawLooper::SkBlurDrawLooper(SkScalar radius, SkScalar dx, SkScalar dy, |
senorblanco@chromium.org | 038aff6 | 2010-12-06 23:45:58 +0000 | [diff] [blame] | 16 | SkColor color, uint32_t flags) |
vandebo@chromium.org | a728e35 | 2012-03-28 20:29:38 +0000 | [diff] [blame] | 17 | : fDx(dx), fDy(dy), fBlurColor(color), fBlurFlags(flags), fState(kDone) { |
reed@google.com | 4e2b3d3 | 2011-04-07 14:18:59 +0000 | [diff] [blame] | 18 | |
senorblanco@chromium.org | 038aff6 | 2010-12-06 23:45:58 +0000 | [diff] [blame] | 19 | SkASSERT(flags <= kAll_BlurFlag); |
reed@google.com | 4e2b3d3 | 2011-04-07 14:18:59 +0000 | [diff] [blame] | 20 | if (radius > 0) { |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame] | 21 | uint32_t blurFlags = flags & kIgnoreTransform_BlurFlag ? |
| 22 | SkBlurMaskFilter::kIgnoreTransform_BlurFlag : |
senorblanco@chromium.org | 038aff6 | 2010-12-06 23:45:58 +0000 | [diff] [blame] | 23 | SkBlurMaskFilter::kNone_BlurFlag; |
| 24 | |
senorblanco@chromium.org | 4868e6b | 2011-02-18 19:03:01 +0000 | [diff] [blame] | 25 | blurFlags |= flags & kHighQuality_BlurFlag ? |
| 26 | SkBlurMaskFilter::kHighQuality_BlurFlag : |
| 27 | SkBlurMaskFilter::kNone_BlurFlag; |
| 28 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 29 | fBlur = SkBlurMaskFilter::Create(radius, |
senorblanco@chromium.org | 4868e6b | 2011-02-18 19:03:01 +0000 | [diff] [blame] | 30 | SkBlurMaskFilter::kNormal_BlurStyle, |
senorblanco@chromium.org | 038aff6 | 2010-12-06 23:45:58 +0000 | [diff] [blame] | 31 | blurFlags); |
reed@google.com | 4e2b3d3 | 2011-04-07 14:18:59 +0000 | [diff] [blame] | 32 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 33 | fBlur = NULL; |
senorblanco@chromium.org | 4868e6b | 2011-02-18 19:03:01 +0000 | [diff] [blame] | 34 | } |
| 35 | |
reed@google.com | 4e2b3d3 | 2011-04-07 14:18:59 +0000 | [diff] [blame] | 36 | if (flags & kOverrideColor_BlurFlag) { |
junov@google.com | a639891 | 2011-03-11 16:45:00 +0000 | [diff] [blame] | 37 | // Set alpha to 1 for the override since transparency will already |
| 38 | // be baked into the blurred mask. |
| 39 | SkColor opaqueColor = SkColorSetA(color, 255); |
senorblanco@chromium.org | 4868e6b | 2011-02-18 19:03:01 +0000 | [diff] [blame] | 40 | //The SrcIn xfer mode will multiply 'color' by the incoming alpha |
reed@google.com | 4e2b3d3 | 2011-04-07 14:18:59 +0000 | [diff] [blame] | 41 | fColorFilter = SkColorFilter::CreateModeFilter(opaqueColor, |
| 42 | SkXfermode::kSrcIn_Mode); |
| 43 | } else { |
senorblanco@chromium.org | 4868e6b | 2011-02-18 19:03:01 +0000 | [diff] [blame] | 44 | fColorFilter = NULL; |
| 45 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 46 | } |
| 47 | |
reed@google.com | 6bac947 | 2011-06-21 19:24:00 +0000 | [diff] [blame] | 48 | SkBlurDrawLooper::SkBlurDrawLooper(SkFlattenableReadBuffer& buffer) |
| 49 | : INHERITED(buffer) { |
| 50 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 51 | fDx = buffer.readScalar(); |
| 52 | fDy = buffer.readScalar(); |
| 53 | fBlurColor = buffer.readU32(); |
| 54 | fBlur = static_cast<SkMaskFilter*>(buffer.readFlattenable()); |
senorblanco@chromium.org | 4868e6b | 2011-02-18 19:03:01 +0000 | [diff] [blame] | 55 | fColorFilter = static_cast<SkColorFilter*>(buffer.readFlattenable()); |
senorblanco@chromium.org | 038aff6 | 2010-12-06 23:45:58 +0000 | [diff] [blame] | 56 | fBlurFlags = buffer.readU32() & kAll_BlurFlag; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 57 | } |
| 58 | |
reed@google.com | 4e2b3d3 | 2011-04-07 14:18:59 +0000 | [diff] [blame] | 59 | SkBlurDrawLooper::~SkBlurDrawLooper() { |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame] | 60 | SkSafeUnref(fBlur); |
senorblanco@chromium.org | 4868e6b | 2011-02-18 19:03:01 +0000 | [diff] [blame] | 61 | SkSafeUnref(fColorFilter); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 62 | } |
| 63 | |
reed@google.com | 4e2b3d3 | 2011-04-07 14:18:59 +0000 | [diff] [blame] | 64 | void SkBlurDrawLooper::flatten(SkFlattenableWriteBuffer& buffer) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 65 | buffer.writeScalar(fDx); |
| 66 | buffer.writeScalar(fDy); |
| 67 | buffer.write32(fBlurColor); |
| 68 | buffer.writeFlattenable(fBlur); |
senorblanco@chromium.org | 4868e6b | 2011-02-18 19:03:01 +0000 | [diff] [blame] | 69 | buffer.writeFlattenable(fColorFilter); |
senorblanco@chromium.org | 038aff6 | 2010-12-06 23:45:58 +0000 | [diff] [blame] | 70 | buffer.write32(fBlurFlags); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 71 | } |
| 72 | |
reed@google.com | 4e2b3d3 | 2011-04-07 14:18:59 +0000 | [diff] [blame] | 73 | void SkBlurDrawLooper::init(SkCanvas* canvas) { |
| 74 | fState = kBeforeEdge; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 75 | } |
| 76 | |
reed@google.com | 4e2b3d3 | 2011-04-07 14:18:59 +0000 | [diff] [blame] | 77 | bool SkBlurDrawLooper::next(SkCanvas* canvas, SkPaint* paint) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 78 | switch (fState) { |
reed@google.com | 4e2b3d3 | 2011-04-07 14:18:59 +0000 | [diff] [blame] | 79 | case kBeforeEdge: |
| 80 | // we do nothing if a maskfilter is already installed |
| 81 | if (paint->getMaskFilter()) { |
| 82 | fState = kDone; |
| 83 | return false; |
| 84 | } |
djsollen@google.com | 56c6977 | 2011-11-08 19:00:26 +0000 | [diff] [blame] | 85 | #ifdef SK_BUILD_FOR_ANDROID |
djsollen@google.com | f5dbe2f | 2011-04-15 13:41:26 +0000 | [diff] [blame] | 86 | SkColor blurColor; |
| 87 | blurColor = fBlurColor; |
| 88 | if (SkColorGetA(blurColor) == 255) { |
| 89 | blurColor = SkColorSetA(blurColor, paint->getAlpha()); |
| 90 | } |
| 91 | paint->setColor(blurColor); |
| 92 | #else |
reed@google.com | 4e2b3d3 | 2011-04-07 14:18:59 +0000 | [diff] [blame] | 93 | paint->setColor(fBlurColor); |
djsollen@google.com | f5dbe2f | 2011-04-15 13:41:26 +0000 | [diff] [blame] | 94 | #endif |
reed@google.com | 4e2b3d3 | 2011-04-07 14:18:59 +0000 | [diff] [blame] | 95 | paint->setMaskFilter(fBlur); |
| 96 | paint->setColorFilter(fColorFilter); |
| 97 | canvas->save(SkCanvas::kMatrix_SaveFlag); |
| 98 | if (fBlurFlags & kIgnoreTransform_BlurFlag) { |
| 99 | SkMatrix transform(canvas->getTotalMatrix()); |
| 100 | transform.postTranslate(fDx, fDy); |
| 101 | canvas->setMatrix(transform); |
| 102 | } else { |
| 103 | canvas->translate(fDx, fDy); |
| 104 | } |
| 105 | fState = kAfterEdge; |
| 106 | return true; |
| 107 | case kAfterEdge: |
| 108 | canvas->restore(); |
| 109 | fState = kDone; |
| 110 | return true; |
| 111 | default: |
| 112 | SkASSERT(kDone == fState); |
| 113 | return false; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 114 | } |
| 115 | } |
| 116 | |
| 117 | /////////////////////////////////////////////////////////////////////////////// |
| 118 | |
caryclark@google.com | d26147a | 2011-12-15 14:16:43 +0000 | [diff] [blame] | 119 | SK_DEFINE_FLATTENABLE_REGISTRAR(SkBlurDrawLooper) |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 120 | |