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comparison: gfx/layers/RotatedBuffer.cpp

gfx/layers/RotatedBuffer.cpp

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1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2 * This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 #include "RotatedBuffer.h"
7 #include <sys/types.h> // for int32_t
8 #include <algorithm> // for max
9 #include "BasicImplData.h" // for BasicImplData
10 #include "BasicLayersImpl.h" // for ToData
11 #include "BufferUnrotate.h" // for BufferUnrotate
12 #include "GeckoProfiler.h" // for PROFILER_LABEL
13 #include "Layers.h" // for ThebesLayer, Layer, etc
14 #include "gfxPlatform.h" // for gfxPlatform
15 #include "gfxPrefs.h" // for gfxPrefs
16 #include "gfxUtils.h" // for gfxUtils
17 #include "mozilla/ArrayUtils.h" // for ArrayLength
18 #include "mozilla/gfx/BasePoint.h" // for BasePoint
19 #include "mozilla/gfx/BaseRect.h" // for BaseRect
20 #include "mozilla/gfx/BaseSize.h" // for BaseSize
21 #include "mozilla/gfx/Matrix.h" // for Matrix
22 #include "mozilla/gfx/Point.h" // for Point, IntPoint
23 #include "mozilla/gfx/Rect.h" // for Rect, IntRect
24 #include "mozilla/gfx/Types.h" // for ExtendMode::ExtendMode::CLAMP, etc
25 #include "mozilla/layers/ShadowLayers.h" // for ShadowableLayer
26 #include "mozilla/layers/TextureClient.h" // for TextureClient
27 #include "nsSize.h" // for nsIntSize
28 #include "gfx2DGlue.h"
29
30 namespace mozilla {
31
32 using namespace gfx;
33
34 namespace layers {
35
36 nsIntRect
37 RotatedBuffer::GetQuadrantRectangle(XSide aXSide, YSide aYSide) const
38 {
39 // quadrantTranslation is the amount we translate the top-left
40 // of the quadrant by to get coordinates relative to the layer
41 nsIntPoint quadrantTranslation = -mBufferRotation;
42 quadrantTranslation.x += aXSide == LEFT ? mBufferRect.width : 0;
43 quadrantTranslation.y += aYSide == TOP ? mBufferRect.height : 0;
44 return mBufferRect + quadrantTranslation;
45 }
46
47 Rect
48 RotatedBuffer::GetSourceRectangle(XSide aXSide, YSide aYSide) const
49 {
50 Rect result;
51 if (aXSide == LEFT) {
52 result.x = 0;
53 result.width = mBufferRotation.x;
54 } else {
55 result.x = mBufferRotation.x;
56 result.width = mBufferRect.width - mBufferRotation.x;
57 }
58 if (aYSide == TOP) {
59 result.y = 0;
60 result.height = mBufferRotation.y;
61 } else {
62 result.y = mBufferRotation.y;
63 result.height = mBufferRect.height - mBufferRotation.y;
64 }
65 return result;
66 }
67
68 /**
69 * @param aXSide LEFT means we draw from the left side of the buffer (which
70 * is drawn on the right side of mBufferRect). RIGHT means we draw from
71 * the right side of the buffer (which is drawn on the left side of
72 * mBufferRect).
73 * @param aYSide TOP means we draw from the top side of the buffer (which
74 * is drawn on the bottom side of mBufferRect). BOTTOM means we draw from
75 * the bottom side of the buffer (which is drawn on the top side of
76 * mBufferRect).
77 */
78 void
79 RotatedBuffer::DrawBufferQuadrant(gfx::DrawTarget* aTarget,
80 XSide aXSide, YSide aYSide,
81 ContextSource aSource,
82 float aOpacity,
83 gfx::CompositionOp aOperator,
84 gfx::SourceSurface* aMask,
85 const gfx::Matrix* aMaskTransform) const
86 {
87 // The rectangle that we're going to fill. Basically we're going to
88 // render the buffer at mBufferRect + quadrantTranslation to get the
89 // pixels in the right place, but we're only going to paint within
90 // mBufferRect
91 nsIntRect quadrantRect = GetQuadrantRectangle(aXSide, aYSide);
92 nsIntRect fillRect;
93 if (!fillRect.IntersectRect(mBufferRect, quadrantRect))
94 return;
95
96 gfx::Point quadrantTranslation(quadrantRect.x, quadrantRect.y);
97
98 MOZ_ASSERT(aOperator == CompositionOp::OP_OVER || aOperator == CompositionOp::OP_SOURCE);
99 // direct2d is much slower when using OP_SOURCE so use OP_OVER and
100 // (maybe) a clear instead. Normally we need to draw in a single operation
101 // (to avoid flickering) but direct2d is ok since it defers rendering.
102 // We should try abstract this logic in a helper when we have other use
103 // cases.
104 if (aTarget->GetType() == BackendType::DIRECT2D && aOperator == CompositionOp::OP_SOURCE) {
105 aOperator = CompositionOp::OP_OVER;
106 if (mDTBuffer->GetFormat() == SurfaceFormat::B8G8R8A8) {
107 aTarget->ClearRect(ToRect(fillRect));
108 }
109 }
110
111 RefPtr<gfx::SourceSurface> snapshot;
112 if (aSource == BUFFER_BLACK) {
113 snapshot = mDTBuffer->Snapshot();
114 } else {
115 MOZ_ASSERT(aSource == BUFFER_WHITE);
116 snapshot = mDTBufferOnWhite->Snapshot();
117 }
118
119 if (aOperator == CompositionOp::OP_SOURCE) {
120 // OP_SOURCE is unbounded in Azure, and we really don't want that behaviour here.
121 // We also can't do a ClearRect+FillRect since we need the drawing to happen
122 // as an atomic operation (to prevent flickering).
123 aTarget->PushClipRect(gfx::Rect(fillRect.x, fillRect.y,
124 fillRect.width, fillRect.height));
125 }
126
127 if (aMask) {
128 Matrix oldTransform = aTarget->GetTransform();
129
130 // Transform from user -> buffer space.
131 Matrix transform;
132 transform.Translate(quadrantTranslation.x, quadrantTranslation.y);
133
134 Matrix inverseMask = *aMaskTransform;
135 inverseMask.Invert();
136
137 transform *= oldTransform;
138 transform *= inverseMask;
139
140 #ifdef MOZ_GFX_OPTIMIZE_MOBILE
141 SurfacePattern source(snapshot, ExtendMode::CLAMP, transform, Filter::POINT);
142 #else
143 SurfacePattern source(snapshot, ExtendMode::CLAMP, transform);
144 #endif
145
146 aTarget->SetTransform(*aMaskTransform);
147 aTarget->MaskSurface(source, aMask, Point(0, 0), DrawOptions(aOpacity, aOperator));
148 aTarget->SetTransform(oldTransform);
149 } else {
150 #ifdef MOZ_GFX_OPTIMIZE_MOBILE
151 DrawSurfaceOptions options(Filter::POINT);
152 #else
153 DrawSurfaceOptions options;
154 #endif
155 aTarget->DrawSurface(snapshot, ToRect(fillRect),
156 GetSourceRectangle(aXSide, aYSide),
157 options,
158 DrawOptions(aOpacity, aOperator));
159 }
160
161 if (aOperator == CompositionOp::OP_SOURCE) {
162 aTarget->PopClip();
163 }
164 }
165
166 void
167 RotatedBuffer::DrawBufferWithRotation(gfx::DrawTarget *aTarget, ContextSource aSource,
168 float aOpacity,
169 gfx::CompositionOp aOperator,
170 gfx::SourceSurface* aMask,
171 const gfx::Matrix* aMaskTransform) const
172 {
173 PROFILER_LABEL("RotatedBuffer", "DrawBufferWithRotation");
174 // See above, in Azure Repeat should always be a safe, even faster choice
175 // though! Particularly on D2D Repeat should be a lot faster, need to look
176 // into that. TODO[Bas]
177 DrawBufferQuadrant(aTarget, LEFT, TOP, aSource, aOpacity, aOperator, aMask, aMaskTransform);
178 DrawBufferQuadrant(aTarget, RIGHT, TOP, aSource, aOpacity, aOperator, aMask, aMaskTransform);
179 DrawBufferQuadrant(aTarget, LEFT, BOTTOM, aSource, aOpacity, aOperator, aMask, aMaskTransform);
180 DrawBufferQuadrant(aTarget, RIGHT, BOTTOM, aSource, aOpacity, aOperator,aMask, aMaskTransform);
181 }
182
183 /* static */ bool
184 RotatedContentBuffer::IsClippingCheap(DrawTarget* aTarget, const nsIntRegion& aRegion)
185 {
186 // Assume clipping is cheap if the draw target just has an integer
187 // translation, and the visible region is simple.
188 return !aTarget->GetTransform().HasNonIntegerTranslation() &&
189 aRegion.GetNumRects() <= 1;
190 }
191
192 void
193 RotatedContentBuffer::DrawTo(ThebesLayer* aLayer,
194 DrawTarget* aTarget,
195 float aOpacity,
196 CompositionOp aOp,
197 SourceSurface* aMask,
198 const Matrix* aMaskTransform)
199 {
200 if (!EnsureBuffer()) {
201 return;
202 }
203
204 bool clipped = false;
205
206 // If the entire buffer is valid, we can just draw the whole thing,
207 // no need to clip. But we'll still clip if clipping is cheap ---
208 // that might let us copy a smaller region of the buffer.
209 // Also clip to the visible region if we're told to.
210 if (!aLayer->GetValidRegion().Contains(BufferRect()) ||
211 (ToData(aLayer)->GetClipToVisibleRegion() &&
212 !aLayer->GetVisibleRegion().Contains(BufferRect())) ||
213 IsClippingCheap(aTarget, aLayer->GetEffectiveVisibleRegion())) {
214 // We don't want to draw invalid stuff, so we need to clip. Might as
215 // well clip to the smallest area possible --- the visible region.
216 // Bug 599189 if there is a non-integer-translation transform in aTarget,
217 // we might sample pixels outside GetEffectiveVisibleRegion(), which is wrong
218 // and may cause gray lines.
219 gfxUtils::ClipToRegionSnapped(aTarget, aLayer->GetEffectiveVisibleRegion());
220 clipped = true;
221 }
222
223 DrawBufferWithRotation(aTarget, BUFFER_BLACK, aOpacity, aOp, aMask, aMaskTransform);
224 if (clipped) {
225 aTarget->PopClip();
226 }
227 }
228
229 DrawTarget*
230 RotatedContentBuffer::BorrowDrawTargetForQuadrantUpdate(const nsIntRect& aBounds,
231 ContextSource aSource,
232 DrawIterator* aIter)
233 {
234 nsIntRect bounds = aBounds;
235 if (aIter) {
236 // If an iterator was provided, then BeginPaint must have been run with
237 // PAINT_CAN_DRAW_ROTATED, and the draw region might cover multiple quadrants.
238 // Iterate over each of them, and return an appropriate buffer each time we find
239 // one that intersects the draw region. The iterator mCount value tracks which
240 // quadrants we have considered across multiple calls to this function.
241 aIter->mDrawRegion.SetEmpty();
242 while (aIter->mCount < 4) {
243 nsIntRect quadrant = GetQuadrantRectangle((aIter->mCount & 1) ? LEFT : RIGHT,
244 (aIter->mCount & 2) ? TOP : BOTTOM);
245 aIter->mDrawRegion.And(aBounds, quadrant);
246 aIter->mCount++;
247 if (!aIter->mDrawRegion.IsEmpty()) {
248 break;
249 }
250 }
251 if (aIter->mDrawRegion.IsEmpty()) {
252 return nullptr;
253 }
254 bounds = aIter->mDrawRegion.GetBounds();
255 }
256
257 if (!EnsureBuffer()) {
258 return nullptr;
259 }
260
261 MOZ_ASSERT(!mLoanedDrawTarget, "draw target has been borrowed and not returned");
262 if (aSource == BUFFER_BOTH && HaveBufferOnWhite()) {
263 if (!EnsureBufferOnWhite()) {
264 return nullptr;
265 }
266 MOZ_ASSERT(mDTBuffer && mDTBufferOnWhite);
267 mLoanedDrawTarget = Factory::CreateDualDrawTarget(mDTBuffer, mDTBufferOnWhite);
268 } else if (aSource == BUFFER_WHITE) {
269 if (!EnsureBufferOnWhite()) {
270 return nullptr;
271 }
272 mLoanedDrawTarget = mDTBufferOnWhite;
273 } else {
274 // BUFFER_BLACK, or BUFFER_BOTH with a single buffer.
275 mLoanedDrawTarget = mDTBuffer;
276 }
277
278 // Figure out which quadrant to draw in
279 int32_t xBoundary = mBufferRect.XMost() - mBufferRotation.x;
280 int32_t yBoundary = mBufferRect.YMost() - mBufferRotation.y;
281 XSide sideX = bounds.XMost() <= xBoundary ? RIGHT : LEFT;
282 YSide sideY = bounds.YMost() <= yBoundary ? BOTTOM : TOP;
283 nsIntRect quadrantRect = GetQuadrantRectangle(sideX, sideY);
284 NS_ASSERTION(quadrantRect.Contains(bounds), "Messed up quadrants");
285
286 mLoanedTransform = mLoanedDrawTarget->GetTransform();
287 mLoanedTransform.Translate(-quadrantRect.x, -quadrantRect.y);
288 mLoanedDrawTarget->SetTransform(mLoanedTransform);
289 mLoanedTransform.Translate(quadrantRect.x, quadrantRect.y);
290
291 return mLoanedDrawTarget;
292 }
293
294 void
295 BorrowDrawTarget::ReturnDrawTarget(gfx::DrawTarget*& aReturned)
296 {
297 MOZ_ASSERT(aReturned == mLoanedDrawTarget);
298 mLoanedDrawTarget->SetTransform(mLoanedTransform);
299 mLoanedDrawTarget = nullptr;
300 aReturned = nullptr;
301 }
302
303 gfxContentType
304 RotatedContentBuffer::BufferContentType()
305 {
306 if (mBufferProvider || mDTBuffer) {
307 SurfaceFormat format;
308
309 if (mBufferProvider) {
310 format = mBufferProvider->GetFormat();
311 } else if (mDTBuffer) {
312 format = mDTBuffer->GetFormat();
313 }
314
315 return ContentForFormat(format);
316 }
317 return gfxContentType::SENTINEL;
318 }
319
320 bool
321 RotatedContentBuffer::BufferSizeOkFor(const nsIntSize& aSize)
322 {
323 return (aSize == mBufferRect.Size() ||
324 (SizedToVisibleBounds != mBufferSizePolicy &&
325 aSize < mBufferRect.Size()));
326 }
327
328 bool
329 RotatedContentBuffer::EnsureBuffer()
330 {
331 NS_ASSERTION(!mLoanedDrawTarget, "Loaned draw target must be returned");
332 if (!mDTBuffer) {
333 if (mBufferProvider) {
334 mDTBuffer = mBufferProvider->GetAsDrawTarget();
335 }
336 }
337
338 NS_WARN_IF_FALSE(mDTBuffer, "no buffer");
339 return !!mDTBuffer;
340 }
341
342 bool
343 RotatedContentBuffer::EnsureBufferOnWhite()
344 {
345 NS_ASSERTION(!mLoanedDrawTarget, "Loaned draw target must be returned");
346 if (!mDTBufferOnWhite) {
347 if (mBufferProviderOnWhite) {
348 mDTBufferOnWhite =
349 mBufferProviderOnWhite->GetAsDrawTarget();
350 }
351 }
352
353 NS_WARN_IF_FALSE(mDTBufferOnWhite, "no buffer");
354 return mDTBufferOnWhite;
355 }
356
357 bool
358 RotatedContentBuffer::HaveBuffer() const
359 {
360 return mDTBuffer || mBufferProvider;
361 }
362
363 bool
364 RotatedContentBuffer::HaveBufferOnWhite() const
365 {
366 return mDTBufferOnWhite || mBufferProviderOnWhite;
367 }
368
369 static void
370 WrapRotationAxis(int32_t* aRotationPoint, int32_t aSize)
371 {
372 if (*aRotationPoint < 0) {
373 *aRotationPoint += aSize;
374 } else if (*aRotationPoint >= aSize) {
375 *aRotationPoint -= aSize;
376 }
377 }
378
379 static nsIntRect
380 ComputeBufferRect(const nsIntRect& aRequestedRect)
381 {
382 nsIntRect rect(aRequestedRect);
383 // Set a minimum width to guarantee a minimum size of buffers we
384 // allocate (and work around problems on some platforms with smaller
385 // dimensions). 64 is the magic number needed to work around the
386 // rendering glitch, and guarantees image rows can be SIMD'd for
387 // even r5g6b5 surfaces pretty much everywhere.
388 rect.width = std::max(aRequestedRect.width, 64);
389 #ifdef MOZ_WIDGET_GONK
390 // Set a minumum height to guarantee a minumum height of buffers we
391 // allocate. Some GL implementations fail to render gralloc textures
392 // with a height 9px-16px. It happens on Adreno 200. Adreno 320 does not
393 // have this problem. 32 is choosed as alignment of gralloc buffers.
394 // See Bug 873937.
395 // Increase the height only when the requested height is more than 0.
396 // See Bug 895976.
397 // XXX it might be better to disable it on the gpu that does not have
398 // the height problem.
399 if (rect.height > 0) {
400 rect.height = std::max(aRequestedRect.height, 32);
401 }
402 #endif
403 return rect;
404 }
405
406 void
407 RotatedContentBuffer::FlushBuffers()
408 {
409 if (mDTBuffer) {
410 mDTBuffer->Flush();
411 }
412 if (mDTBufferOnWhite) {
413 mDTBufferOnWhite->Flush();
414 }
415 }
416
417 RotatedContentBuffer::PaintState
418 RotatedContentBuffer::BeginPaint(ThebesLayer* aLayer,
419 uint32_t aFlags)
420 {
421 PaintState result;
422 // We need to disable rotation if we're going to be resampled when
423 // drawing, because we might sample across the rotation boundary.
424 bool canHaveRotation = gfxPlatform::BufferRotationEnabled() &&
425 !(aFlags & (PAINT_WILL_RESAMPLE | PAINT_NO_ROTATION));
426
427 nsIntRegion validRegion = aLayer->GetValidRegion();
428
429 bool canUseOpaqueSurface = aLayer->CanUseOpaqueSurface();
430 ContentType layerContentType =
431 canUseOpaqueSurface ? gfxContentType::COLOR :
432 gfxContentType::COLOR_ALPHA;
433
434 SurfaceMode mode;
435 nsIntRegion neededRegion;
436 bool canReuseBuffer;
437 nsIntRect destBufferRect;
438
439 while (true) {
440 mode = aLayer->GetSurfaceMode();
441 neededRegion = aLayer->GetVisibleRegion();
442 canReuseBuffer = HaveBuffer() && BufferSizeOkFor(neededRegion.GetBounds().Size());
443 result.mContentType = layerContentType;
444
445 if (canReuseBuffer) {
446 if (mBufferRect.Contains(neededRegion.GetBounds())) {
447 // We don't need to adjust mBufferRect.
448 destBufferRect = mBufferRect;
449 } else if (neededRegion.GetBounds().Size() <= mBufferRect.Size()) {
450 // The buffer's big enough but doesn't contain everything that's
451 // going to be visible. We'll move it.
452 destBufferRect = nsIntRect(neededRegion.GetBounds().TopLeft(), mBufferRect.Size());
453 } else {
454 destBufferRect = neededRegion.GetBounds();
455 }
456 } else {
457 // We won't be reusing the buffer. Compute a new rect.
458 destBufferRect = ComputeBufferRect(neededRegion.GetBounds());
459 }
460
461 if (mode == SurfaceMode::SURFACE_COMPONENT_ALPHA) {
462 #if defined(MOZ_GFX_OPTIMIZE_MOBILE) || defined(MOZ_WIDGET_GONK)
463 mode = SurfaceMode::SURFACE_SINGLE_CHANNEL_ALPHA;
464 #else
465 if (!aLayer->GetParent() ||
466 !aLayer->GetParent()->SupportsComponentAlphaChildren() ||
467 !aLayer->Manager()->IsCompositingCheap() ||
468 !aLayer->AsShadowableLayer() ||
469 !aLayer->AsShadowableLayer()->HasShadow() ||
470 !gfxPrefs::ComponentAlphaEnabled()) {
471 mode = SurfaceMode::SURFACE_SINGLE_CHANNEL_ALPHA;
472 } else {
473 result.mContentType = gfxContentType::COLOR;
474 }
475 #endif
476 }
477
478 if ((aFlags & PAINT_WILL_RESAMPLE) &&
479 (!neededRegion.GetBounds().IsEqualInterior(destBufferRect) ||
480 neededRegion.GetNumRects() > 1)) {
481 // The area we add to neededRegion might not be painted opaquely
482 if (mode == SurfaceMode::SURFACE_OPAQUE) {
483 result.mContentType = gfxContentType::COLOR_ALPHA;
484 mode = SurfaceMode::SURFACE_SINGLE_CHANNEL_ALPHA;
485 }
486
487 // We need to validate the entire buffer, to make sure that only valid
488 // pixels are sampled
489 neededRegion = destBufferRect;
490 }
491
492 // If we have an existing buffer, but the content type has changed or we
493 // have transitioned into/out of component alpha, then we need to recreate it.
494 if (HaveBuffer() &&
495 (result.mContentType != BufferContentType() ||
496 (mode == SurfaceMode::SURFACE_COMPONENT_ALPHA) != HaveBufferOnWhite())) {
497
498 // We're effectively clearing the valid region, so we need to draw
499 // the entire needed region now.
500 result.mRegionToInvalidate = aLayer->GetValidRegion();
501 validRegion.SetEmpty();
502 Clear();
503 // Restart decision process with the cleared buffer. We can only go
504 // around the loop one more iteration, since mDTBuffer is null now.
505 continue;
506 }
507
508 break;
509 }
510
511 NS_ASSERTION(destBufferRect.Contains(neededRegion.GetBounds()),
512 "Destination rect doesn't contain what we need to paint");
513
514 result.mRegionToDraw.Sub(neededRegion, validRegion);
515
516 if (result.mRegionToDraw.IsEmpty())
517 return result;
518
519 // Do not modify result.mRegionToDraw or result.mContentType after this call.
520 // Do not modify mBufferRect, mBufferRotation, or mDidSelfCopy,
521 // or call CreateBuffer before this call.
522 FinalizeFrame(result.mRegionToDraw);
523
524 nsIntRect drawBounds = result.mRegionToDraw.GetBounds();
525 RefPtr<DrawTarget> destDTBuffer;
526 RefPtr<DrawTarget> destDTBufferOnWhite;
527 uint32_t bufferFlags = canHaveRotation ? ALLOW_REPEAT : 0;
528 if (mode == SurfaceMode::SURFACE_COMPONENT_ALPHA) {
529 bufferFlags |= BUFFER_COMPONENT_ALPHA;
530 }
531 if (canReuseBuffer) {
532 if (!EnsureBuffer()) {
533 return result;
534 }
535 nsIntRect keepArea;
536 if (keepArea.IntersectRect(destBufferRect, mBufferRect)) {
537 // Set mBufferRotation so that the pixels currently in mDTBuffer
538 // will still be rendered in the right place when mBufferRect
539 // changes to destBufferRect.
540 nsIntPoint newRotation = mBufferRotation +
541 (destBufferRect.TopLeft() - mBufferRect.TopLeft());
542 WrapRotationAxis(&newRotation.x, mBufferRect.width);
543 WrapRotationAxis(&newRotation.y, mBufferRect.height);
544 NS_ASSERTION(nsIntRect(nsIntPoint(0,0), mBufferRect.Size()).Contains(newRotation),
545 "newRotation out of bounds");
546 int32_t xBoundary = destBufferRect.XMost() - newRotation.x;
547 int32_t yBoundary = destBufferRect.YMost() - newRotation.y;
548 bool drawWrapsBuffer = (drawBounds.x < xBoundary && xBoundary < drawBounds.XMost()) ||
549 (drawBounds.y < yBoundary && yBoundary < drawBounds.YMost());
550 if ((drawWrapsBuffer && !(aFlags & PAINT_CAN_DRAW_ROTATED)) ||
551 (newRotation != nsIntPoint(0,0) && !canHaveRotation)) {
552 // The stuff we need to redraw will wrap around an edge of the
553 // buffer (and the caller doesn't know how to support that), so
554 // move the pixels we can keep into a position that lets us
555 // redraw in just one quadrant.
556 if (mBufferRotation == nsIntPoint(0,0)) {
557 nsIntRect srcRect(nsIntPoint(0, 0), mBufferRect.Size());
558 nsIntPoint dest = mBufferRect.TopLeft() - destBufferRect.TopLeft();
559 MOZ_ASSERT(mDTBuffer);
560 mDTBuffer->CopyRect(IntRect(srcRect.x, srcRect.y, srcRect.width, srcRect.height),
561 IntPoint(dest.x, dest.y));
562 if (mode == SurfaceMode::SURFACE_COMPONENT_ALPHA) {
563 if (!EnsureBufferOnWhite()) {
564 return result;
565 }
566 MOZ_ASSERT(mDTBufferOnWhite);
567 mDTBufferOnWhite->CopyRect(IntRect(srcRect.x, srcRect.y, srcRect.width, srcRect.height),
568 IntPoint(dest.x, dest.y));
569 }
570 result.mDidSelfCopy = true;
571 mDidSelfCopy = true;
572 // Don't set destBuffer; we special-case self-copies, and
573 // just did the necessary work above.
574 mBufferRect = destBufferRect;
575 } else {
576 // With azure and a data surface perform an buffer unrotate
577 // (SelfCopy).
578 unsigned char* data;
579 IntSize size;
580 int32_t stride;
581 SurfaceFormat format;
582
583 if (mDTBuffer->LockBits(&data, &size, &stride, &format)) {
584 uint8_t bytesPerPixel = BytesPerPixel(format);
585 BufferUnrotate(data,
586 size.width * bytesPerPixel,
587 size.height, stride,
588 newRotation.x * bytesPerPixel, newRotation.y);
589 mDTBuffer->ReleaseBits(data);
590
591 if (mode == SurfaceMode::SURFACE_COMPONENT_ALPHA) {
592 if (!EnsureBufferOnWhite()) {
593 return result;
594 }
595 MOZ_ASSERT(mDTBufferOnWhite);
596 mDTBufferOnWhite->LockBits(&data, &size, &stride, &format);
597 uint8_t bytesPerPixel = BytesPerPixel(format);
598 BufferUnrotate(data,
599 size.width * bytesPerPixel,
600 size.height, stride,
601 newRotation.x * bytesPerPixel, newRotation.y);
602 mDTBufferOnWhite->ReleaseBits(data);
603 }
604
605 // Buffer unrotate moves all the pixels, note that
606 // we self copied for SyncBackToFrontBuffer
607 result.mDidSelfCopy = true;
608 mDidSelfCopy = true;
609 mBufferRect = destBufferRect;
610 mBufferRotation = nsIntPoint(0, 0);
611 }
612
613 if (!result.mDidSelfCopy) {
614 destBufferRect = ComputeBufferRect(neededRegion.GetBounds());
615 CreateBuffer(result.mContentType, destBufferRect, bufferFlags,
616 &destDTBuffer, &destDTBufferOnWhite);
617 if (!destDTBuffer) {
618 return result;
619 }
620 }
621 }
622 } else {
623 mBufferRect = destBufferRect;
624 mBufferRotation = newRotation;
625 }
626 } else {
627 // No pixels are going to be kept. The whole visible region
628 // will be redrawn, so we don't need to copy anything, so we don't
629 // set destBuffer.
630 mBufferRect = destBufferRect;
631 mBufferRotation = nsIntPoint(0,0);
632 }
633 } else {
634 // The buffer's not big enough, so allocate a new one
635 CreateBuffer(result.mContentType, destBufferRect, bufferFlags,
636 &destDTBuffer, &destDTBufferOnWhite);
637 if (!destDTBuffer) {
638 return result;
639 }
640 }
641
642 NS_ASSERTION(!(aFlags & PAINT_WILL_RESAMPLE) || destBufferRect == neededRegion.GetBounds(),
643 "If we're resampling, we need to validate the entire buffer");
644
645 // If we have no buffered data already, then destBuffer will be a fresh buffer
646 // and we do not need to clear it below.
647 bool isClear = !HaveBuffer();
648
649 if (destDTBuffer) {
650 if (!isClear && (mode != SurfaceMode::SURFACE_COMPONENT_ALPHA || HaveBufferOnWhite())) {
651 // Copy the bits
652 nsIntPoint offset = -destBufferRect.TopLeft();
653 Matrix mat;
654 mat.Translate(offset.x, offset.y);
655 destDTBuffer->SetTransform(mat);
656 if (!EnsureBuffer()) {
657 return result;
658 }
659 MOZ_ASSERT(mDTBuffer, "Have we got a Thebes buffer for some reason?");
660 DrawBufferWithRotation(destDTBuffer, BUFFER_BLACK, 1.0, CompositionOp::OP_SOURCE);
661 destDTBuffer->SetTransform(Matrix());
662
663 if (mode == SurfaceMode::SURFACE_COMPONENT_ALPHA) {
664 NS_ASSERTION(destDTBufferOnWhite, "Must have a white buffer!");
665 destDTBufferOnWhite->SetTransform(mat);
666 if (!EnsureBufferOnWhite()) {
667 return result;
668 }
669 MOZ_ASSERT(mDTBufferOnWhite, "Have we got a Thebes buffer for some reason?");
670 DrawBufferWithRotation(destDTBufferOnWhite, BUFFER_WHITE, 1.0, CompositionOp::OP_SOURCE);
671 destDTBufferOnWhite->SetTransform(Matrix());
672 }
673 }
674
675 mDTBuffer = destDTBuffer.forget();
676 mDTBufferOnWhite = destDTBufferOnWhite.forget();
677 mBufferRect = destBufferRect;
678 mBufferRotation = nsIntPoint(0,0);
679 }
680 NS_ASSERTION(canHaveRotation || mBufferRotation == nsIntPoint(0,0),
681 "Rotation disabled, but we have nonzero rotation?");
682
683 nsIntRegion invalidate;
684 invalidate.Sub(aLayer->GetValidRegion(), destBufferRect);
685 result.mRegionToInvalidate.Or(result.mRegionToInvalidate, invalidate);
686 result.mClip = DrawRegionClip::DRAW_SNAPPED;
687 result.mMode = mode;
688
689 return result;
690 }
691
692 DrawTarget*
693 RotatedContentBuffer::BorrowDrawTargetForPainting(const PaintState& aPaintState,
694 DrawIterator* aIter /* = nullptr */)
695 {
696 if (aPaintState.mMode == SurfaceMode::SURFACE_NONE) {
697 return nullptr;
698 }
699
700 DrawTarget* result = BorrowDrawTargetForQuadrantUpdate(aPaintState.mRegionToDraw.GetBounds(),
701 BUFFER_BOTH, aIter);
702 if (!result) {
703 return nullptr;
704 }
705 const nsIntRegion* drawPtr = &aPaintState.mRegionToDraw;
706 if (aIter) {
707 // The iterators draw region currently only contains the bounds of the region,
708 // this makes it the precise region.
709 aIter->mDrawRegion.And(aIter->mDrawRegion, aPaintState.mRegionToDraw);
710 drawPtr = &aIter->mDrawRegion;
711 }
712
713 if (aPaintState.mMode == SurfaceMode::SURFACE_COMPONENT_ALPHA) {
714 MOZ_ASSERT(mDTBuffer && mDTBufferOnWhite);
715 nsIntRegionRectIterator iter(*drawPtr);
716 const nsIntRect *iterRect;
717 while ((iterRect = iter.Next())) {
718 mDTBuffer->FillRect(Rect(iterRect->x, iterRect->y, iterRect->width, iterRect->height),
719 ColorPattern(Color(0.0, 0.0, 0.0, 1.0)));
720 mDTBufferOnWhite->FillRect(Rect(iterRect->x, iterRect->y, iterRect->width, iterRect->height),
721 ColorPattern(Color(1.0, 1.0, 1.0, 1.0)));
722 }
723 } else if (aPaintState.mContentType == gfxContentType::COLOR_ALPHA && HaveBuffer()) {
724 // HaveBuffer() => we have an existing buffer that we must clear
725 nsIntRegionRectIterator iter(*drawPtr);
726 const nsIntRect *iterRect;
727 while ((iterRect = iter.Next())) {
728 result->ClearRect(Rect(iterRect->x, iterRect->y, iterRect->width, iterRect->height));
729 }
730 }
731
732 return result;
733 }
734
735 }
736 }
737

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