1/*
2 * Copyright 2016 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 "include/core/SkOverdrawCanvas.h"
9
10#include "include/core/SkColorFilter.h"
11#include "include/core/SkDrawable.h"
12#include "include/core/SkPath.h"
13#include "include/core/SkRRect.h"
14#include "include/core/SkRSXform.h"
15#include "include/core/SkTextBlob.h"
16#include "include/private/SkTo.h"
17#include "src/core/SkDevice.h"
18#include "src/core/SkDrawShadowInfo.h"
19#include "src/core/SkGlyphRunPainter.h"
20#include "src/core/SkImagePriv.h"
21#include "src/core/SkLatticeIter.h"
22#include "src/core/SkStrikeCache.h"
23#include "src/core/SkTextBlobPriv.h"
24#include "src/utils/SkPatchUtils.h"
25
26SkOverdrawCanvas::SkOverdrawCanvas(SkCanvas* canvas)
27    : INHERITED(canvas->onImageInfo().width(), canvas->onImageInfo().height())
28{
29    // Non-drawing calls that SkOverdrawCanvas does not override (translate, save, etc.)
30    // will pass through to the input canvas.
31    this->addCanvas(canvas);
32
33    static constexpr float kIncrementAlpha[] = {
34            0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
35            0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
36            0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
37            0.0f, 0.0f, 0.0f, 0.0f, 1.0f/255,
38    };
39
40    fPaint.setAntiAlias(false);
41    fPaint.setBlendMode(SkBlendMode::kPlus);
42    fPaint.setColorFilter(SkColorFilters::Matrix(kIncrementAlpha));
43}
44
45namespace {
46class TextDevice : public SkNoPixelsDevice, public SkGlyphRunListPainter::BitmapDevicePainter {
47public:
48    TextDevice(SkCanvas* overdrawCanvas, const SkSurfaceProps& props)
49            : SkNoPixelsDevice{SkIRect::MakeWH(32767, 32767), props},
50              fOverdrawCanvas{overdrawCanvas},
51              fPainter{props, kN32_SkColorType, nullptr, SkStrikeCache::GlobalStrikeCache()} {}
52
53    void paintPaths(SkDrawableGlyphBuffer*, SkScalar, SkPoint, const SkPaint&) const override {}
54
55    void paintMasks(SkDrawableGlyphBuffer* drawables, const SkPaint& paint) const override {
56        for (auto t : drawables->drawable()) {
57            SkGlyphVariant glyph; SkPoint pos;
58            std::tie(glyph, pos) = t;
59            SkMask mask = glyph.glyph()->mask(pos);
60            fOverdrawCanvas->drawRect(SkRect::Make(mask.fBounds), SkPaint());
61        }
62    }
63
64    void    drawBitmap(const SkBitmap&, const SkMatrix&, const SkRect* dstOrNull,
65                       const SkSamplingOptions&, const SkPaint&) const override {}
66
67    void onDrawGlyphRunList(const SkGlyphRunList& glyphRunList, const SkPaint& paint) override {
68        SkASSERT(!glyphRunList.hasRSXForm());
69        fPainter.drawForBitmapDevice(glyphRunList, paint, SkMatrix(), this);
70    }
71
72private:
73    SkCanvas* const fOverdrawCanvas;
74    SkGlyphRunListPainter fPainter;
75};
76}  // namespace
77
78void SkOverdrawCanvas::onDrawTextBlob(
79        const SkTextBlob* blob, SkScalar x, SkScalar y, const SkPaint& paint) {
80    SkGlyphRunBuilder b;
81    auto glyphRunList = b.blobToGlyphRunList(*blob, {x, y});
82    this->onDrawGlyphRunList(glyphRunList, paint);
83}
84
85void SkOverdrawCanvas::onDrawGlyphRunList(
86        const SkGlyphRunList& glyphRunList, const SkPaint& paint) {
87    SkSurfaceProps props{0, kUnknown_SkPixelGeometry};
88    this->getProps(&props);
89    TextDevice device{this, props};
90
91    device.drawGlyphRunList(glyphRunList, paint);
92}
93
94void SkOverdrawCanvas::onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
95                                   const SkPoint texCoords[4], SkBlendMode blendMode,
96                                   const SkPaint&) {
97    fList[0]->onDrawPatch(cubics, colors, texCoords, blendMode, fPaint);
98}
99
100void SkOverdrawCanvas::onDrawPaint(const SkPaint& paint) {
101    if (0 == paint.getColor() && !paint.getColorFilter() && !paint.getShader()) {
102        // This is a clear, ignore it.
103    } else {
104        fList[0]->onDrawPaint(this->overdrawPaint(paint));
105    }
106}
107
108void SkOverdrawCanvas::onDrawBehind(const SkPaint& paint) {
109    fList[0]->onDrawBehind(this->overdrawPaint(paint));
110}
111
112void SkOverdrawCanvas::onDrawRect(const SkRect& rect, const SkPaint& paint) {
113    fList[0]->onDrawRect(rect, this->overdrawPaint(paint));
114}
115
116void SkOverdrawCanvas::onDrawRegion(const SkRegion& region, const SkPaint& paint) {
117    fList[0]->onDrawRegion(region, this->overdrawPaint(paint));
118}
119
120void SkOverdrawCanvas::onDrawOval(const SkRect& oval, const SkPaint& paint) {
121    fList[0]->onDrawOval(oval, this->overdrawPaint(paint));
122}
123
124void SkOverdrawCanvas::onDrawArc(const SkRect& arc, SkScalar startAngle, SkScalar sweepAngle,
125                                 bool useCenter, const SkPaint& paint) {
126    fList[0]->onDrawArc(arc, startAngle, sweepAngle, useCenter, this->overdrawPaint(paint));
127}
128
129void SkOverdrawCanvas::onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
130                                    const SkPaint& paint) {
131    fList[0]->onDrawDRRect(outer, inner, this->overdrawPaint(paint));
132}
133
134void SkOverdrawCanvas::onDrawRRect(const SkRRect& rect, const SkPaint& paint) {
135    fList[0]->onDrawRRect(rect, this->overdrawPaint(paint));
136}
137
138void SkOverdrawCanvas::onDrawPoints(PointMode mode, size_t count, const SkPoint points[],
139                                    const SkPaint& paint) {
140    fList[0]->onDrawPoints(mode, count, points, this->overdrawPaint(paint));
141}
142
143void SkOverdrawCanvas::onDrawVerticesObject(const SkVertices* vertices,
144                                            SkBlendMode blendMode, const SkPaint& paint) {
145    fList[0]->onDrawVerticesObject(vertices, blendMode, this->overdrawPaint(paint));
146}
147
148void SkOverdrawCanvas::onDrawAtlas2(const SkImage* image, const SkRSXform xform[],
149                                    const SkRect texs[], const SkColor colors[], int count,
150                                    SkBlendMode mode, const SkSamplingOptions& sampling,
151                                    const SkRect* cull, const SkPaint* paint) {
152    SkPaint* paintPtr = &fPaint;
153    SkPaint storage;
154    if (paint) {
155        storage = this->overdrawPaint(*paint);
156        paintPtr = &storage;
157    }
158
159    fList[0]->onDrawAtlas2(image, xform, texs, colors, count, mode, sampling, cull, paintPtr);
160}
161
162void SkOverdrawCanvas::onDrawPath(const SkPath& path, const SkPaint& paint) {
163    fList[0]->onDrawPath(path, fPaint);
164}
165
166void SkOverdrawCanvas::onDrawImage2(const SkImage* image, SkScalar x, SkScalar y,
167                                    const SkSamplingOptions&, const SkPaint*) {
168    fList[0]->onDrawRect(SkRect::MakeXYWH(x, y, image->width(), image->height()), fPaint);
169}
170
171void SkOverdrawCanvas::onDrawImageRect2(const SkImage* image, const SkRect& src, const SkRect& dst,
172                                        const SkSamplingOptions&, const SkPaint*, SrcRectConstraint) {
173    fList[0]->onDrawRect(dst, fPaint);
174}
175
176void SkOverdrawCanvas::onDrawImageLattice2(const SkImage* image, const Lattice& lattice,
177                                           const SkRect& dst, SkFilterMode, const SkPaint*) {
178    SkIRect bounds;
179    Lattice latticePlusBounds = lattice;
180    if (!latticePlusBounds.fBounds) {
181        bounds = SkIRect::MakeWH(image->width(), image->height());
182        latticePlusBounds.fBounds = &bounds;
183    }
184
185    if (SkLatticeIter::Valid(image->width(), image->height(), latticePlusBounds)) {
186        SkLatticeIter iter(latticePlusBounds, dst);
187
188        SkRect ignored, iterDst;
189        while (iter.next(&ignored, &iterDst)) {
190            fList[0]->onDrawRect(iterDst, fPaint);
191        }
192    } else {
193        fList[0]->onDrawRect(dst, fPaint);
194    }
195}
196
197void SkOverdrawCanvas::onDrawDrawable(SkDrawable* drawable, const SkMatrix* matrix) {
198    drawable->draw(this, matrix);
199}
200
201void SkOverdrawCanvas::onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*) {
202    SkASSERT(false);
203    return;
204}
205
206void SkOverdrawCanvas::onDrawAnnotation(const SkRect&, const char[], SkData*) {}
207
208void SkOverdrawCanvas::onDrawShadowRec(const SkPath& path, const SkDrawShadowRec& rec) {
209    SkRect bounds;
210    SkDrawShadowMetrics::GetLocalBounds(path, rec, this->getTotalMatrix(), &bounds);
211    fList[0]->onDrawRect(bounds, fPaint);
212}
213
214void SkOverdrawCanvas::onDrawEdgeAAQuad(const SkRect& rect, const SkPoint clip[4],
215                                        QuadAAFlags aa, const SkColor4f& color, SkBlendMode mode) {
216    if (clip) {
217        fList[0]->onDrawPath(SkPath::Polygon(clip, 4, true), fPaint);
218    } else {
219        fList[0]->onDrawRect(rect, fPaint);
220    }
221}
222
223void SkOverdrawCanvas::onDrawEdgeAAImageSet2(const ImageSetEntry set[], int count,
224                                             const SkPoint dstClips[],
225                                             const SkMatrix preViewMatrices[],
226                                             const SkSamplingOptions& sampling,
227                                             const SkPaint* paint,
228                                             SrcRectConstraint constraint) {
229    int clipIndex = 0;
230    for (int i = 0; i < count; ++i) {
231        if (set[i].fMatrixIndex >= 0) {
232            fList[0]->save();
233            fList[0]->concat(preViewMatrices[set[i].fMatrixIndex]);
234        }
235        if (set[i].fHasClip) {
236            fList[0]->onDrawPath(SkPath::Polygon(dstClips + clipIndex, 4, true), fPaint);
237            clipIndex += 4;
238        } else {
239            fList[0]->onDrawRect(set[i].fDstRect, fPaint);
240        }
241        if (set[i].fMatrixIndex >= 0) {
242            fList[0]->restore();
243        }
244    }
245}
246
247inline SkPaint SkOverdrawCanvas::overdrawPaint(const SkPaint& paint) {
248    SkPaint newPaint = fPaint;
249    newPaint.setStyle(paint.getStyle());
250    newPaint.setStrokeWidth(paint.getStrokeWidth());
251    return newPaint;
252}
253