1 /*
2 * Copyright 2011 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 "src/core/SkDevice.h"
9
10 #include "include/core/SkColorFilter.h"
11 #include "include/core/SkDrawable.h"
12 #include "include/core/SkImageFilter.h"
13 #include "include/core/SkPathMeasure.h"
14 #include "include/core/SkRSXform.h"
15 #include "include/core/SkShader.h"
16 #include "include/core/SkVertices.h"
17 #include "include/private/SkTo.h"
18 #include "src/core/SkDraw.h"
19 #include "src/core/SkGlyphRun.h"
20 #include "src/core/SkImageFilterCache.h"
21 #include "src/core/SkImagePriv.h"
22 #include "src/core/SkLatticeIter.h"
23 #include "src/core/SkMakeUnique.h"
24 #include "src/core/SkMatrixPriv.h"
25 #include "src/core/SkPathPriv.h"
26 #include "src/core/SkRasterClip.h"
27 #include "src/core/SkSpecialImage.h"
28 #include "src/core/SkTLazy.h"
29 #include "src/core/SkTextBlobPriv.h"
30 #include "src/core/SkUtils.h"
31 #include "src/image/SkImage_Base.h"
32 #include "src/shaders/SkLocalMatrixShader.h"
33 #include "src/utils/SkPatchUtils.h"
34
SkBaseDevice(const SkImageInfo & info,const SkSurfaceProps & surfaceProps)35 SkBaseDevice::SkBaseDevice(const SkImageInfo& info, const SkSurfaceProps& surfaceProps)
36 : fInfo(info)
37 , fSurfaceProps(surfaceProps)
38 {
39 fOrigin = {0, 0};
40 fCTM.reset();
41 }
42
setOrigin(const SkMatrix & globalCTM,int x,int y)43 void SkBaseDevice::setOrigin(const SkMatrix& globalCTM, int x, int y) {
44 fOrigin.set(x, y);
45 fCTM = globalCTM;
46 fCTM.postTranslate(SkIntToScalar(-x), SkIntToScalar(-y));
47 }
48
setGlobalCTM(const SkMatrix & ctm)49 void SkBaseDevice::setGlobalCTM(const SkMatrix& ctm) {
50 fCTM = ctm;
51 if (fOrigin.fX | fOrigin.fY) {
52 fCTM.postTranslate(-SkIntToScalar(fOrigin.fX), -SkIntToScalar(fOrigin.fY));
53 }
54 }
55
clipIsWideOpen() const56 bool SkBaseDevice::clipIsWideOpen() const {
57 if (ClipType::kRect == this->onGetClipType()) {
58 SkRegion rgn;
59 this->onAsRgnClip(&rgn);
60 SkASSERT(rgn.isRect());
61 return rgn.getBounds() == SkIRect::MakeWH(this->width(), this->height());
62 } else {
63 return false;
64 }
65 }
66
AdjustGeometry(TileUsage tileUsage,SkPixelGeometry geo)67 SkPixelGeometry SkBaseDevice::CreateInfo::AdjustGeometry(TileUsage tileUsage, SkPixelGeometry geo) {
68 switch (tileUsage) {
69 case kPossible_TileUsage:
70 // (we think) for compatibility with old clients, we assume this layer can support LCD
71 // even though they may not have marked it as opaque... seems like we should update
72 // our callers (reed/robertphilips).
73 break;
74 case kNever_TileUsage:
75 geo = kUnknown_SkPixelGeometry;
76 break;
77 }
78 return geo;
79 }
80
is_int(float x)81 static inline bool is_int(float x) {
82 return x == (float) sk_float_round2int(x);
83 }
84
drawRegion(const SkRegion & region,const SkPaint & paint)85 void SkBaseDevice::drawRegion(const SkRegion& region, const SkPaint& paint) {
86 const SkMatrix& ctm = this->ctm();
87 bool isNonTranslate = ctm.getType() & ~(SkMatrix::kTranslate_Mask);
88 bool complexPaint = paint.getStyle() != SkPaint::kFill_Style || paint.getMaskFilter() ||
89 paint.getPathEffect();
90 bool antiAlias = paint.isAntiAlias() && (!is_int(ctm.getTranslateX()) ||
91 !is_int(ctm.getTranslateY()));
92 if (isNonTranslate || complexPaint || antiAlias) {
93 SkPath path;
94 region.getBoundaryPath(&path);
95 path.setIsVolatile(true);
96 return this->drawPath(path, paint, true);
97 }
98
99 SkRegion::Iterator it(region);
100 while (!it.done()) {
101 this->drawRect(SkRect::Make(it.rect()), paint);
102 it.next();
103 }
104 }
105
drawArc(const SkRect & oval,SkScalar startAngle,SkScalar sweepAngle,bool useCenter,const SkPaint & paint)106 void SkBaseDevice::drawArc(const SkRect& oval, SkScalar startAngle,
107 SkScalar sweepAngle, bool useCenter, const SkPaint& paint) {
108 SkPath path;
109 bool isFillNoPathEffect = SkPaint::kFill_Style == paint.getStyle() && !paint.getPathEffect();
110 SkPathPriv::CreateDrawArcPath(&path, oval, startAngle, sweepAngle, useCenter,
111 isFillNoPathEffect);
112 this->drawPath(path, paint);
113 }
114
drawDRRect(const SkRRect & outer,const SkRRect & inner,const SkPaint & paint)115 void SkBaseDevice::drawDRRect(const SkRRect& outer,
116 const SkRRect& inner, const SkPaint& paint) {
117 SkPath path;
118 path.addRRect(outer);
119 path.addRRect(inner);
120 path.setFillType(SkPath::kEvenOdd_FillType);
121 path.setIsVolatile(true);
122
123 this->drawPath(path, paint, true);
124 }
125
drawPatch(const SkPoint cubics[12],const SkColor colors[4],const SkPoint texCoords[4],SkBlendMode bmode,const SkPaint & paint)126 void SkBaseDevice::drawPatch(const SkPoint cubics[12], const SkColor colors[4],
127 const SkPoint texCoords[4], SkBlendMode bmode, const SkPaint& paint) {
128 SkISize lod = SkPatchUtils::GetLevelOfDetail(cubics, &this->ctm());
129 auto vertices = SkPatchUtils::MakeVertices(cubics, colors, texCoords, lod.width(), lod.height(),
130 this->imageInfo().colorSpace());
131 if (vertices) {
132 this->drawVertices(vertices.get(), nullptr, 0, bmode, paint);
133 }
134 }
135
drawImageRect(const SkImage * image,const SkRect * src,const SkRect & dst,const SkPaint & paint,SkCanvas::SrcRectConstraint constraint)136 void SkBaseDevice::drawImageRect(const SkImage* image, const SkRect* src,
137 const SkRect& dst, const SkPaint& paint,
138 SkCanvas::SrcRectConstraint constraint) {
139 SkBitmap bm;
140 if (as_IB(image)->getROPixels(&bm)) {
141 this->drawBitmapRect(bm, src, dst, paint, constraint);
142 }
143 }
144
drawImageNine(const SkImage * image,const SkIRect & center,const SkRect & dst,const SkPaint & paint)145 void SkBaseDevice::drawImageNine(const SkImage* image, const SkIRect& center,
146 const SkRect& dst, const SkPaint& paint) {
147 SkLatticeIter iter(image->width(), image->height(), center, dst);
148
149 SkRect srcR, dstR;
150 while (iter.next(&srcR, &dstR)) {
151 this->drawImageRect(image, &srcR, dstR, paint, SkCanvas::kStrict_SrcRectConstraint);
152 }
153 }
154
drawBitmapNine(const SkBitmap & bitmap,const SkIRect & center,const SkRect & dst,const SkPaint & paint)155 void SkBaseDevice::drawBitmapNine(const SkBitmap& bitmap, const SkIRect& center,
156 const SkRect& dst, const SkPaint& paint) {
157 SkLatticeIter iter(bitmap.width(), bitmap.height(), center, dst);
158
159 SkRect srcR, dstR;
160 while (iter.next(&srcR, &dstR)) {
161 this->drawBitmapRect(bitmap, &srcR, dstR, paint, SkCanvas::kStrict_SrcRectConstraint);
162 }
163 }
164
drawImageLattice(const SkImage * image,const SkCanvas::Lattice & lattice,const SkRect & dst,const SkPaint & paint)165 void SkBaseDevice::drawImageLattice(const SkImage* image,
166 const SkCanvas::Lattice& lattice, const SkRect& dst,
167 const SkPaint& paint) {
168 SkLatticeIter iter(lattice, dst);
169
170 SkRect srcR, dstR;
171 SkColor c;
172 bool isFixedColor = false;
173 const SkImageInfo info = SkImageInfo::Make(1, 1, kBGRA_8888_SkColorType, kUnpremul_SkAlphaType);
174
175 while (iter.next(&srcR, &dstR, &isFixedColor, &c)) {
176 if (isFixedColor || (srcR.width() <= 1.0f && srcR.height() <= 1.0f &&
177 image->readPixels(info, &c, 4, srcR.fLeft, srcR.fTop))) {
178 // Fast draw with drawRect, if this is a patch containing a single color
179 // or if this is a patch containing a single pixel.
180 if (0 != c || !paint.isSrcOver()) {
181 SkPaint paintCopy(paint);
182 int alpha = SkAlphaMul(SkColorGetA(c), SkAlpha255To256(paint.getAlpha()));
183 paintCopy.setColor(SkColorSetA(c, alpha));
184 this->drawRect(dstR, paintCopy);
185 }
186 } else {
187 this->drawImageRect(image, &srcR, dstR, paint, SkCanvas::kStrict_SrcRectConstraint);
188 }
189 }
190 }
191
drawBitmapLattice(const SkBitmap & bitmap,const SkCanvas::Lattice & lattice,const SkRect & dst,const SkPaint & paint)192 void SkBaseDevice::drawBitmapLattice(const SkBitmap& bitmap,
193 const SkCanvas::Lattice& lattice, const SkRect& dst,
194 const SkPaint& paint) {
195 SkLatticeIter iter(lattice, dst);
196
197 SkRect srcR, dstR;
198 while (iter.next(&srcR, &dstR)) {
199 this->drawBitmapRect(bitmap, &srcR, dstR, paint, SkCanvas::kStrict_SrcRectConstraint);
200 }
201 }
202
quad_to_tris(SkPoint tris[6],const SkPoint quad[4])203 static SkPoint* quad_to_tris(SkPoint tris[6], const SkPoint quad[4]) {
204 tris[0] = quad[0];
205 tris[1] = quad[1];
206 tris[2] = quad[2];
207
208 tris[3] = quad[0];
209 tris[4] = quad[2];
210 tris[5] = quad[3];
211
212 return tris + 6;
213 }
214
drawAtlas(const SkImage * atlas,const SkRSXform xform[],const SkRect tex[],const SkColor colors[],int quadCount,SkBlendMode mode,const SkPaint & paint)215 void SkBaseDevice::drawAtlas(const SkImage* atlas, const SkRSXform xform[],
216 const SkRect tex[], const SkColor colors[], int quadCount,
217 SkBlendMode mode, const SkPaint& paint) {
218 const int triCount = quadCount << 1;
219 const int vertexCount = triCount * 3;
220 uint32_t flags = SkVertices::kHasTexCoords_BuilderFlag;
221 if (colors) {
222 flags |= SkVertices::kHasColors_BuilderFlag;
223 }
224 SkVertices::Builder builder(SkVertices::kTriangles_VertexMode, vertexCount, 0, flags);
225
226 SkPoint* vPos = builder.positions();
227 SkPoint* vTex = builder.texCoords();
228 SkColor* vCol = builder.colors();
229 for (int i = 0; i < quadCount; ++i) {
230 SkPoint tmp[4];
231 xform[i].toQuad(tex[i].width(), tex[i].height(), tmp);
232 vPos = quad_to_tris(vPos, tmp);
233
234 tex[i].toQuad(tmp);
235 vTex = quad_to_tris(vTex, tmp);
236
237 if (colors) {
238 sk_memset32(vCol, colors[i], 6);
239 vCol += 6;
240 }
241 }
242 SkPaint p(paint);
243 p.setShader(atlas->makeShader());
244 this->drawVertices(builder.detach().get(), nullptr, 0, mode, p);
245 }
246
247
drawEdgeAAQuad(const SkRect & r,const SkPoint clip[4],SkCanvas::QuadAAFlags aa,SkColor color,SkBlendMode mode)248 void SkBaseDevice::drawEdgeAAQuad(const SkRect& r, const SkPoint clip[4],
249 SkCanvas::QuadAAFlags aa, SkColor color, SkBlendMode mode) {
250 SkPaint paint;
251 paint.setColor(color);
252 paint.setBlendMode(mode);
253 paint.setAntiAlias(aa == SkCanvas::kAll_QuadAAFlags);
254
255 if (clip) {
256 // Draw the clip directly as a quad since it's a filled color with no local coords
257 SkPath clipPath;
258 clipPath.addPoly(clip, 4, true);
259 this->drawPath(clipPath, paint);
260 } else {
261 this->drawRect(r, paint);
262 }
263 }
264
drawEdgeAAImageSet(const SkCanvas::ImageSetEntry images[],int count,const SkPoint dstClips[],const SkMatrix preViewMatrices[],const SkPaint & paint,SkCanvas::SrcRectConstraint constraint)265 void SkBaseDevice::drawEdgeAAImageSet(const SkCanvas::ImageSetEntry images[], int count,
266 const SkPoint dstClips[], const SkMatrix preViewMatrices[],
267 const SkPaint& paint,
268 SkCanvas::SrcRectConstraint constraint) {
269 SkASSERT(paint.getStyle() == SkPaint::kFill_Style);
270 SkASSERT(!paint.getPathEffect());
271
272 SkPaint entryPaint = paint;
273 const SkMatrix baseCTM = this->ctm();
274 int clipIndex = 0;
275 for (int i = 0; i < count; ++i) {
276 // TODO: Handle per-edge AA. Right now this mirrors the SkiaRenderer component of Chrome
277 // which turns off antialiasing unless all four edges should be antialiased. This avoids
278 // seaming in tiled composited layers.
279 entryPaint.setAntiAlias(images[i].fAAFlags == SkCanvas::kAll_QuadAAFlags);
280 entryPaint.setAlphaf(paint.getAlphaf() * images[i].fAlpha);
281
282 bool needsRestore = false;
283 SkASSERT(images[i].fMatrixIndex < 0 || preViewMatrices);
284 if (images[i].fMatrixIndex >= 0) {
285 this->save();
286 this->setGlobalCTM(SkMatrix::Concat(
287 baseCTM, preViewMatrices[images[i].fMatrixIndex]));
288 needsRestore = true;
289 }
290
291 SkASSERT(!images[i].fHasClip || dstClips);
292 if (images[i].fHasClip) {
293 // Since drawImageRect requires a srcRect, the dst clip is implemented as a true clip
294 if (!needsRestore) {
295 this->save();
296 needsRestore = true;
297 }
298 SkPath clipPath;
299 clipPath.addPoly(dstClips + clipIndex, 4, true);
300 this->clipPath(clipPath, SkClipOp::kIntersect, entryPaint.isAntiAlias());
301 clipIndex += 4;
302 }
303 this->drawImageRect(images[i].fImage.get(), &images[i].fSrcRect, images[i].fDstRect,
304 entryPaint, constraint);
305 if (needsRestore) {
306 this->restore(baseCTM);
307 }
308 }
309 }
310
311 ///////////////////////////////////////////////////////////////////////////////////////////////////
312
drawDrawable(SkDrawable * drawable,const SkMatrix * matrix,SkCanvas * canvas)313 void SkBaseDevice::drawDrawable(SkDrawable* drawable, const SkMatrix* matrix, SkCanvas* canvas) {
314 drawable->draw(canvas, matrix);
315 }
316
317 ///////////////////////////////////////////////////////////////////////////////////////////////////
318
drawSpecial(SkSpecialImage *,int x,int y,const SkPaint &,SkImage *,const SkMatrix &)319 void SkBaseDevice::drawSpecial(SkSpecialImage*, int x, int y, const SkPaint&,
320 SkImage*, const SkMatrix&) {}
makeSpecial(const SkBitmap &)321 sk_sp<SkSpecialImage> SkBaseDevice::makeSpecial(const SkBitmap&) { return nullptr; }
makeSpecial(const SkImage *)322 sk_sp<SkSpecialImage> SkBaseDevice::makeSpecial(const SkImage*) { return nullptr; }
snapSpecial()323 sk_sp<SkSpecialImage> SkBaseDevice::snapSpecial() { return nullptr; }
324
325 ///////////////////////////////////////////////////////////////////////////////////////////////////
326
readPixels(const SkPixmap & pm,int x,int y)327 bool SkBaseDevice::readPixels(const SkPixmap& pm, int x, int y) {
328 return this->onReadPixels(pm, x, y);
329 }
330
writePixels(const SkPixmap & pm,int x,int y)331 bool SkBaseDevice::writePixels(const SkPixmap& pm, int x, int y) {
332 return this->onWritePixels(pm, x, y);
333 }
334
onWritePixels(const SkPixmap &,int,int)335 bool SkBaseDevice::onWritePixels(const SkPixmap&, int, int) {
336 return false;
337 }
338
onReadPixels(const SkPixmap &,int x,int y)339 bool SkBaseDevice::onReadPixels(const SkPixmap&, int x, int y) {
340 return false;
341 }
342
accessPixels(SkPixmap * pmap)343 bool SkBaseDevice::accessPixels(SkPixmap* pmap) {
344 SkPixmap tempStorage;
345 if (nullptr == pmap) {
346 pmap = &tempStorage;
347 }
348 return this->onAccessPixels(pmap);
349 }
350
peekPixels(SkPixmap * pmap)351 bool SkBaseDevice::peekPixels(SkPixmap* pmap) {
352 SkPixmap tempStorage;
353 if (nullptr == pmap) {
354 pmap = &tempStorage;
355 }
356 return this->onPeekPixels(pmap);
357 }
358
359 //////////////////////////////////////////////////////////////////////////////////////////
360
361 #include "src/core/SkUtils.h"
362
drawGlyphRunRSXform(const SkFont & font,const SkGlyphID glyphs[],const SkRSXform xform[],int count,SkPoint origin,const SkPaint & paint)363 void SkBaseDevice::drawGlyphRunRSXform(const SkFont& font, const SkGlyphID glyphs[],
364 const SkRSXform xform[], int count, SkPoint origin,
365 const SkPaint& paint) {
366 const SkMatrix originalCTM = this->ctm();
367 if (!originalCTM.isFinite() || !SkScalarIsFinite(font.getSize()) ||
368 !SkScalarIsFinite(font.getScaleX()) ||
369 !SkScalarIsFinite(font.getSkewX())) {
370 return;
371 }
372
373 SkPoint sharedPos{0, 0}; // we're at the origin
374 SkGlyphID glyphID;
375 SkGlyphRun glyphRun{
376 font,
377 SkSpan<const SkPoint>{&sharedPos, 1},
378 SkSpan<const SkGlyphID>{&glyphID, 1},
379 SkSpan<const char>{},
380 SkSpan<const uint32_t>{}
381 };
382
383 for (int i = 0; i < count; i++) {
384 glyphID = glyphs[i];
385 // now "glyphRun" is pointing at the current glyphID
386
387 SkMatrix ctm;
388 ctm.setRSXform(xform[i]).postTranslate(origin.fX, origin.fY);
389
390 // We want to rotate each glyph by the rsxform, but we don't want to rotate "space"
391 // (i.e. the shader that cares about the ctm) so we have to undo our little ctm trick
392 // with a localmatrixshader so that the shader draws as if there was no change to the ctm.
393 SkPaint transformingPaint{paint};
394 auto shader = transformingPaint.getShader();
395 if (shader) {
396 SkMatrix inverse;
397 if (ctm.invert(&inverse)) {
398 transformingPaint.setShader(shader->makeWithLocalMatrix(inverse));
399 } else {
400 transformingPaint.setShader(nullptr); // can't handle this xform
401 }
402 }
403
404 ctm.setConcat(originalCTM, ctm);
405 this->setCTM(ctm);
406
407 this->drawGlyphRunList(SkGlyphRunList{glyphRun, transformingPaint});
408 }
409 this->setCTM(originalCTM);
410 }
411
412 //////////////////////////////////////////////////////////////////////////////////////////
413
makeSurface(SkImageInfo const &,SkSurfaceProps const &)414 sk_sp<SkSurface> SkBaseDevice::makeSurface(SkImageInfo const&, SkSurfaceProps const&) {
415 return nullptr;
416 }
417
snapBackImage(const SkIRect &)418 sk_sp<SkSpecialImage> SkBaseDevice::snapBackImage(const SkIRect&) {
419 return nullptr;
420 }
421
422 //////////////////////////////////////////////////////////////////////////////////////////
423
LogDrawScaleFactor(const SkMatrix & view,const SkMatrix & srcToDst,SkFilterQuality filterQuality)424 void SkBaseDevice::LogDrawScaleFactor(const SkMatrix& view, const SkMatrix& srcToDst,
425 SkFilterQuality filterQuality) {
426 #if SK_HISTOGRAMS_ENABLED
427 SkMatrix matrix = SkMatrix::Concat(view, srcToDst);
428 enum ScaleFactor {
429 kUpscale_ScaleFactor,
430 kNoScale_ScaleFactor,
431 kDownscale_ScaleFactor,
432 kLargeDownscale_ScaleFactor,
433
434 kLast_ScaleFactor = kLargeDownscale_ScaleFactor
435 };
436
437 float rawScaleFactor = matrix.getMinScale();
438
439 ScaleFactor scaleFactor;
440 if (rawScaleFactor < 0.5f) {
441 scaleFactor = kLargeDownscale_ScaleFactor;
442 } else if (rawScaleFactor < 1.0f) {
443 scaleFactor = kDownscale_ScaleFactor;
444 } else if (rawScaleFactor > 1.0f) {
445 scaleFactor = kUpscale_ScaleFactor;
446 } else {
447 scaleFactor = kNoScale_ScaleFactor;
448 }
449
450 switch (filterQuality) {
451 case kNone_SkFilterQuality:
452 SK_HISTOGRAM_ENUMERATION("DrawScaleFactor.NoneFilterQuality", scaleFactor,
453 kLast_ScaleFactor + 1);
454 break;
455 case kLow_SkFilterQuality:
456 SK_HISTOGRAM_ENUMERATION("DrawScaleFactor.LowFilterQuality", scaleFactor,
457 kLast_ScaleFactor + 1);
458 break;
459 case kMedium_SkFilterQuality:
460 SK_HISTOGRAM_ENUMERATION("DrawScaleFactor.MediumFilterQuality", scaleFactor,
461 kLast_ScaleFactor + 1);
462 break;
463 case kHigh_SkFilterQuality:
464 SK_HISTOGRAM_ENUMERATION("DrawScaleFactor.HighFilterQuality", scaleFactor,
465 kLast_ScaleFactor + 1);
466 break;
467 }
468
469 // Also log filter quality independent scale factor.
470 SK_HISTOGRAM_ENUMERATION("DrawScaleFactor.AnyFilterQuality", scaleFactor,
471 kLast_ScaleFactor + 1);
472
473 // Also log an overall histogram of filter quality.
474 SK_HISTOGRAM_ENUMERATION("FilterQuality", filterQuality, kLast_SkFilterQuality + 1);
475 #endif
476 }
477