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 scale, const SkPaint& paint) 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
64protected:
65 void drawGlyphRunList(const SkGlyphRunList& glyphRunList) override {
66 fPainter.drawForBitmapDevice(glyphRunList, fOverdrawCanvas->getTotalMatrix(), this);
67 }
68
69private:
70 SkCanvas* const fOverdrawCanvas;
71 SkGlyphRunListPainter fPainter;
72};
73} // namespace
74
75void SkOverdrawCanvas::onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
76 const SkPaint& paint) {
77 SkGlyphRunBuilder b;
78 SkSurfaceProps props{0, kUnknown_SkPixelGeometry};
79 this->getProps(&props);
80 TextDevice device{this, props};
81
82 b.drawTextBlob(paint, *blob, {x, y}, &device);
83}
84
85void SkOverdrawCanvas::onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
86 const SkPoint texCoords[4], SkBlendMode blendMode,
87 const SkPaint&) {
88 fList[0]->onDrawPatch(cubics, colors, texCoords, blendMode, fPaint);
89}
90
91void SkOverdrawCanvas::onDrawPaint(const SkPaint& paint) {
92 if (0 == paint.getColor() && !paint.getColorFilter() && !paint.getShader()) {
93 // This is a clear, ignore it.
94 } else {
95 fList[0]->onDrawPaint(this->overdrawPaint(paint));
96 }
97}
98
99void SkOverdrawCanvas::onDrawBehind(const SkPaint& paint) {
100 fList[0]->onDrawBehind(this->overdrawPaint(paint));
101}
102
103void SkOverdrawCanvas::onDrawRect(const SkRect& rect, const SkPaint& paint) {
104 fList[0]->onDrawRect(rect, this->overdrawPaint(paint));
105}
106
107void SkOverdrawCanvas::onDrawRegion(const SkRegion& region, const SkPaint& paint) {
108 fList[0]->onDrawRegion(region, this->overdrawPaint(paint));
109}
110
111void SkOverdrawCanvas::onDrawOval(const SkRect& oval, const SkPaint& paint) {
112 fList[0]->onDrawOval(oval, this->overdrawPaint(paint));
113}
114
115void SkOverdrawCanvas::onDrawArc(const SkRect& arc, SkScalar startAngle, SkScalar sweepAngle,
116 bool useCenter, const SkPaint& paint) {
117 fList[0]->onDrawArc(arc, startAngle, sweepAngle, useCenter, this->overdrawPaint(paint));
118}
119
120void SkOverdrawCanvas::onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
121 const SkPaint& paint) {
122 fList[0]->onDrawDRRect(outer, inner, this->overdrawPaint(paint));
123}
124
125void SkOverdrawCanvas::onDrawRRect(const SkRRect& rect, const SkPaint& paint) {
126 fList[0]->onDrawRRect(rect, this->overdrawPaint(paint));
127}
128
129void SkOverdrawCanvas::onDrawPoints(PointMode mode, size_t count, const SkPoint points[],
130 const SkPaint& paint) {
131 fList[0]->onDrawPoints(mode, count, points, this->overdrawPaint(paint));
132}
133
134void SkOverdrawCanvas::onDrawVerticesObject(const SkVertices* vertices,
135 SkBlendMode blendMode, const SkPaint& paint) {
136 fList[0]->onDrawVerticesObject(vertices, blendMode, this->overdrawPaint(paint));
137}
138
139void SkOverdrawCanvas::onDrawAtlas(const SkImage* image, const SkRSXform xform[],
140 const SkRect texs[], const SkColor colors[], int count,
141 SkBlendMode mode, const SkRect* cull, const SkPaint* paint) {
142 SkPaint* paintPtr = &fPaint;
143 SkPaint storage;
144 if (paint) {
145 storage = this->overdrawPaint(*paint);
146 paintPtr = &storage;
147 }
148
149 fList[0]->onDrawAtlas(image, xform, texs, colors, count, mode, cull, paintPtr);
150}
151
152void SkOverdrawCanvas::onDrawPath(const SkPath& path, const SkPaint& paint) {
153 fList[0]->onDrawPath(path, fPaint);
154}
155
156void SkOverdrawCanvas::onDrawImage(const SkImage* image, SkScalar x, SkScalar y, const SkPaint*) {
157 fList[0]->onDrawRect(SkRect::MakeXYWH(x, y, image->width(), image->height()), fPaint);
158}
159
160void SkOverdrawCanvas::onDrawImageRect(const SkImage* image, const SkRect* src, const SkRect& dst,
161 const SkPaint*, SrcRectConstraint) {
162 fList[0]->onDrawRect(dst, fPaint);
163}
164
165void SkOverdrawCanvas::onDrawImageNine(const SkImage*, const SkIRect&, const SkRect& dst,
166 const SkPaint*) {
167 fList[0]->onDrawRect(dst, fPaint);
168}
169
170void SkOverdrawCanvas::onDrawImageLattice(const SkImage* image, const Lattice& lattice,
171 const SkRect& dst, const SkPaint*) {
172 SkIRect bounds;
173 Lattice latticePlusBounds = lattice;
174 if (!latticePlusBounds.fBounds) {
175 bounds = SkIRect::MakeWH(image->width(), image->height());
176 latticePlusBounds.fBounds = &bounds;
177 }
178
179 if (SkLatticeIter::Valid(image->width(), image->height(), latticePlusBounds)) {
180 SkLatticeIter iter(latticePlusBounds, dst);
181
182 SkRect dummy, iterDst;
183 while (iter.next(&dummy, &iterDst)) {
184 fList[0]->onDrawRect(iterDst, fPaint);
185 }
186 } else {
187 fList[0]->onDrawRect(dst, fPaint);
188 }
189}
190
191void SkOverdrawCanvas::onDrawDrawable(SkDrawable* drawable, const SkMatrix* matrix) {
192 drawable->draw(this, matrix);
193}
194
195void SkOverdrawCanvas::onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*) {
196 SkASSERT(false);
197 return;
198}
199
200void SkOverdrawCanvas::onDrawAnnotation(const SkRect&, const char[], SkData*) {}
201
202void SkOverdrawCanvas::onDrawShadowRec(const SkPath& path, const SkDrawShadowRec& rec) {
203 SkRect bounds;
204 SkDrawShadowMetrics::GetLocalBounds(path, rec, this->getTotalMatrix(), &bounds);
205 fList[0]->onDrawRect(bounds, fPaint);
206}
207
208void SkOverdrawCanvas::onDrawEdgeAAQuad(const SkRect& rect, const SkPoint clip[4],
209 QuadAAFlags aa, const SkColor4f& color, SkBlendMode mode) {
210 if (clip) {
211 SkPath path;
212 path.addPoly(clip, 4, true);
213 fList[0]->onDrawPath(path, fPaint);
214 } else {
215 fList[0]->onDrawRect(rect, fPaint);
216 }
217}
218
219void SkOverdrawCanvas::onDrawEdgeAAImageSet(const ImageSetEntry set[], int count,
220 const SkPoint dstClips[],
221 const SkMatrix preViewMatrices[], const SkPaint* paint,
222 SrcRectConstraint constraint) {
223 int clipIndex = 0;
224 for (int i = 0; i < count; ++i) {
225 if (set[i].fMatrixIndex >= 0) {
226 fList[0]->save();
227 fList[0]->concat(preViewMatrices[set[i].fMatrixIndex]);
228 }
229 if (set[i].fHasClip) {
230 SkPath path;
231 path.addPoly(dstClips + clipIndex, 4, true);
232 clipIndex += 4;
233 fList[0]->onDrawPath(path, fPaint);
234 } else {
235 fList[0]->onDrawRect(set[i].fDstRect, fPaint);
236 }
237 if (set[i].fMatrixIndex >= 0) {
238 fList[0]->restore();
239 }
240 }
241}
242
243inline SkPaint SkOverdrawCanvas::overdrawPaint(const SkPaint& paint) {
244 SkPaint newPaint = fPaint;
245 newPaint.setStyle(paint.getStyle());
246 newPaint.setStrokeWidth(paint.getStrokeWidth());
247 return newPaint;
248}
249