robertphillips@google.com | 58b2021 | 2012-06-27 20:44:52 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2012 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 "GrSWMaskHelper.h" |
| 9 | #include "GrDrawState.h" |
| 10 | #include "GrGpu.h" |
| 11 | |
| 12 | // TODO: try to remove this #include |
| 13 | #include "GrContext.h" |
| 14 | |
| 15 | namespace { |
| 16 | /* |
| 17 | * Convert a boolean operation into a transfer mode code |
| 18 | */ |
| 19 | SkXfermode::Mode op_to_mode(SkRegion::Op op) { |
| 20 | |
| 21 | static const SkXfermode::Mode modeMap[] = { |
| 22 | SkXfermode::kDstOut_Mode, // kDifference_Op |
| 23 | SkXfermode::kMultiply_Mode, // kIntersect_Op |
| 24 | SkXfermode::kSrcOver_Mode, // kUnion_Op |
| 25 | SkXfermode::kXor_Mode, // kXOR_Op |
| 26 | SkXfermode::kClear_Mode, // kReverseDifference_Op |
| 27 | SkXfermode::kSrc_Mode, // kReplace_Op |
| 28 | }; |
| 29 | |
| 30 | return modeMap[op]; |
| 31 | } |
| 32 | |
| 33 | //////////////////////////////////////////////////////////////////////////////// |
| 34 | SkPath::FillType gr_fill_to_sk_fill(GrPathFill fill) { |
| 35 | switch (fill) { |
| 36 | case kWinding_GrPathFill: |
| 37 | return SkPath::kWinding_FillType; |
| 38 | case kEvenOdd_GrPathFill: |
| 39 | return SkPath::kEvenOdd_FillType; |
| 40 | case kInverseWinding_GrPathFill: |
| 41 | return SkPath::kInverseWinding_FillType; |
| 42 | case kInverseEvenOdd_GrPathFill: |
| 43 | return SkPath::kInverseEvenOdd_FillType; |
| 44 | default: |
| 45 | GrCrash("Unexpected fill."); |
| 46 | return SkPath::kWinding_FillType; |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * Draw a single rect element of the clip stack into the accumulation bitmap |
| 54 | */ |
| 55 | void GrSWMaskHelper::draw(const GrRect& clientRect, SkRegion::Op op, |
| 56 | bool antiAlias, GrColor color) { |
| 57 | SkPaint paint; |
| 58 | |
| 59 | SkXfermode* mode = SkXfermode::Create(op_to_mode(op)); |
| 60 | |
| 61 | paint.setXfermode(mode); |
| 62 | paint.setAntiAlias(antiAlias); |
| 63 | paint.setColor(color); |
| 64 | |
| 65 | fDraw.drawRect(clientRect, paint); |
| 66 | |
| 67 | SkSafeUnref(mode); |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * Draw a single path element of the clip stack into the accumulation bitmap |
| 72 | */ |
| 73 | void GrSWMaskHelper::draw(const SkPath& clientPath, SkRegion::Op op, |
| 74 | GrPathFill fill, bool antiAlias, GrColor color) { |
| 75 | |
| 76 | SkPaint paint; |
| 77 | SkPath tmpPath; |
| 78 | const SkPath* pathToDraw = &clientPath; |
| 79 | if (kHairLine_GrPathFill == fill) { |
| 80 | paint.setStyle(SkPaint::kStroke_Style); |
| 81 | paint.setStrokeWidth(SK_Scalar1); |
| 82 | } else { |
| 83 | paint.setStyle(SkPaint::kFill_Style); |
| 84 | SkPath::FillType skfill = gr_fill_to_sk_fill(fill); |
| 85 | if (skfill != pathToDraw->getFillType()) { |
| 86 | tmpPath = *pathToDraw; |
| 87 | tmpPath.setFillType(skfill); |
| 88 | pathToDraw = &tmpPath; |
| 89 | } |
| 90 | } |
| 91 | SkXfermode* mode = SkXfermode::Create(op_to_mode(op)); |
| 92 | |
| 93 | paint.setXfermode(mode); |
| 94 | paint.setAntiAlias(antiAlias); |
| 95 | paint.setColor(color); |
| 96 | |
| 97 | fDraw.drawPath(*pathToDraw, paint); |
| 98 | |
| 99 | SkSafeUnref(mode); |
| 100 | } |
| 101 | |
| 102 | bool GrSWMaskHelper::init(const GrIRect& pathDevBounds, |
| 103 | const GrPoint* translate, |
| 104 | bool useMatrix) { |
| 105 | if (useMatrix) { |
| 106 | fMatrix = fContext->getMatrix(); |
| 107 | } else { |
| 108 | fMatrix.setIdentity(); |
| 109 | } |
| 110 | |
| 111 | if (NULL != translate) { |
| 112 | fMatrix.postTranslate(translate->fX, translate->fY); |
| 113 | } |
| 114 | |
| 115 | fMatrix.postTranslate(-pathDevBounds.fLeft * SK_Scalar1, |
| 116 | -pathDevBounds.fTop * SK_Scalar1); |
| 117 | GrIRect bounds = GrIRect::MakeWH(pathDevBounds.width(), |
| 118 | pathDevBounds.height()); |
| 119 | |
| 120 | fBM.setConfig(SkBitmap::kA8_Config, bounds.fRight, bounds.fBottom); |
| 121 | if (!fBM.allocPixels()) { |
| 122 | return false; |
| 123 | } |
| 124 | sk_bzero(fBM.getPixels(), fBM.getSafeSize()); |
| 125 | |
| 126 | sk_bzero(&fDraw, sizeof(fDraw)); |
| 127 | fRasterClip.setRect(bounds); |
| 128 | fDraw.fRC = &fRasterClip; |
| 129 | fDraw.fClip = &fRasterClip.bwRgn(); |
| 130 | fDraw.fMatrix = &fMatrix; |
| 131 | fDraw.fBitmap = &fBM; |
| 132 | return true; |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * Get a texture (from the texture cache) of the correct size & format |
| 137 | */ |
| 138 | bool GrSWMaskHelper::getTexture(GrAutoScratchTexture* tex) { |
| 139 | GrTextureDesc desc; |
| 140 | desc.fWidth = fBM.width(); |
| 141 | desc.fHeight = fBM.height(); |
| 142 | desc.fConfig = kAlpha_8_GrPixelConfig; |
| 143 | |
| 144 | tex->set(fContext, desc); |
| 145 | GrTexture* texture = tex->texture(); |
| 146 | |
| 147 | if (NULL == texture) { |
| 148 | return false; |
| 149 | } |
| 150 | |
| 151 | return true; |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * Move the result of the software mask generation back to the gpu |
| 156 | */ |
| 157 | void GrSWMaskHelper::toTexture(GrTexture *texture, bool clearToWhite) { |
| 158 | SkAutoLockPixels alp(fBM); |
| 159 | |
| 160 | // The destination texture is almost always larger than "fBM". Clear |
| 161 | // it appropriately so we don't get mask artifacts outside of the path's |
| 162 | // bounding box |
| 163 | |
| 164 | // "texture" needs to be installed as the render target for the clear |
| 165 | // and the texture upload but cannot remain the render target upon |
| 166 | // returned. Callers typically use it as a texture and it would then |
| 167 | // be both source and dest. |
| 168 | GrDrawState::AutoRenderTargetRestore artr(fContext->getGpu()->drawState(), |
| 169 | texture->asRenderTarget()); |
| 170 | |
| 171 | if (clearToWhite) { |
| 172 | fContext->getGpu()->clear(NULL, SK_ColorWHITE); |
| 173 | } else { |
| 174 | fContext->getGpu()->clear(NULL, 0x00000000); |
| 175 | } |
| 176 | |
| 177 | texture->writePixels(0, 0, fBM.width(), fBM.height(), |
| 178 | kAlpha_8_GrPixelConfig, |
| 179 | fBM.getPixels(), fBM.rowBytes()); |
| 180 | } |
| 181 | |