| // Copyright 2013 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "flutter/display_list/skia/dl_sk_dispatcher.h" |
| |
| #include "flutter/display_list/display_list_blend_mode.h" |
| #include "flutter/display_list/skia/dl_sk_conversions.h" |
| #include "flutter/fml/trace_event.h" |
| #include "third_party/skia/include/utils/SkShadowUtils.h" |
| |
| namespace flutter { |
| |
| const SkPaint* DlSkCanvasDispatcher::safe_paint(bool use_attributes) { |
| if (use_attributes) { |
| // The accumulated SkPaint object will already have incorporated |
| // any attribute overrides. |
| return &paint(); |
| } else if (has_opacity()) { |
| temp_paint_.setAlphaf(opacity()); |
| return &temp_paint_; |
| } else { |
| return nullptr; |
| } |
| } |
| |
| void DlSkCanvasDispatcher::save() { |
| canvas_->save(); |
| // save has no impact on attributes, but it needs to register a record |
| // on the restore stack so that the eventual call to restore() will |
| // know what to do at that time. We could annotate the restore record |
| // with a flag that the record came from a save call, but it is simpler |
| // to just pass in the current opacity value as the value to be used by |
| // the children and let the utility calls notice that it didn't change. |
| save_opacity(opacity()); |
| } |
| void DlSkCanvasDispatcher::restore() { |
| canvas_->restore(); |
| restore_opacity(); |
| } |
| void DlSkCanvasDispatcher::saveLayer(const SkRect* bounds, |
| const SaveLayerOptions options, |
| const DlImageFilter* backdrop) { |
| if (bounds == nullptr && options.can_distribute_opacity() && |
| backdrop == nullptr) { |
| // We know that: |
| // - no bounds is needed for clipping here |
| // - no backdrop filter is used to initialize the layer |
| // - the current attributes only have an alpha |
| // - the children are compatible with individually rendering with |
| // an inherited opacity |
| // Therefore we can just use a save instead of a saveLayer and pass the |
| // intended opacity to the children. |
| canvas_->save(); |
| // If the saveLayer does not use attributes, the children should continue |
| // to render with the inherited opacity unmodified. If attributes are to |
| // be applied, the children should render with the combination of the |
| // inherited opacity combined with the alpha from the current color. |
| save_opacity(options.renders_with_attributes() ? combined_opacity() |
| : opacity()); |
| } else { |
| TRACE_EVENT0("flutter", "Canvas::saveLayer"); |
| const SkPaint* paint = safe_paint(options.renders_with_attributes()); |
| const sk_sp<SkImageFilter> sk_backdrop = ToSk(backdrop); |
| canvas_->saveLayer( |
| SkCanvas::SaveLayerRec(bounds, paint, sk_backdrop.get(), 0)); |
| // saveLayer will apply the current opacity on behalf of the children |
| // so they will inherit an opaque opacity. |
| save_opacity(SK_Scalar1); |
| } |
| } |
| |
| void DlSkCanvasDispatcher::translate(SkScalar tx, SkScalar ty) { |
| canvas_->translate(tx, ty); |
| } |
| void DlSkCanvasDispatcher::scale(SkScalar sx, SkScalar sy) { |
| canvas_->scale(sx, sy); |
| } |
| void DlSkCanvasDispatcher::rotate(SkScalar degrees) { |
| canvas_->rotate(degrees); |
| } |
| void DlSkCanvasDispatcher::skew(SkScalar sx, SkScalar sy) { |
| canvas_->skew(sx, sy); |
| } |
| // clang-format off |
| // 2x3 2D affine subset of a 4x4 transform in row major order |
| void DlSkCanvasDispatcher::transform2DAffine( |
| SkScalar mxx, SkScalar mxy, SkScalar mxt, |
| SkScalar myx, SkScalar myy, SkScalar myt) { |
| // Internally concat(SkMatrix) gets redirected to concat(SkM44) |
| // so we just jump directly to the SkM44 version |
| canvas_->concat(SkM44(mxx, mxy, 0, mxt, |
| myx, myy, 0, myt, |
| 0, 0, 1, 0, |
| 0, 0, 0, 1)); |
| } |
| // full 4x4 transform in row major order |
| void DlSkCanvasDispatcher::transformFullPerspective( |
| SkScalar mxx, SkScalar mxy, SkScalar mxz, SkScalar mxt, |
| SkScalar myx, SkScalar myy, SkScalar myz, SkScalar myt, |
| SkScalar mzx, SkScalar mzy, SkScalar mzz, SkScalar mzt, |
| SkScalar mwx, SkScalar mwy, SkScalar mwz, SkScalar mwt) { |
| canvas_->concat(SkM44(mxx, mxy, mxz, mxt, |
| myx, myy, myz, myt, |
| mzx, mzy, mzz, mzt, |
| mwx, mwy, mwz, mwt)); |
| } |
| // clang-format on |
| void DlSkCanvasDispatcher::transformReset() { |
| canvas_->setMatrix(original_transform_); |
| } |
| |
| void DlSkCanvasDispatcher::clipRect(const SkRect& rect, |
| ClipOp clip_op, |
| bool is_aa) { |
| canvas_->clipRect(rect, ToSk(clip_op), is_aa); |
| } |
| void DlSkCanvasDispatcher::clipRRect(const SkRRect& rrect, |
| ClipOp clip_op, |
| bool is_aa) { |
| canvas_->clipRRect(rrect, ToSk(clip_op), is_aa); |
| } |
| void DlSkCanvasDispatcher::clipPath(const SkPath& path, |
| ClipOp clip_op, |
| bool is_aa) { |
| canvas_->clipPath(path, ToSk(clip_op), is_aa); |
| } |
| |
| void DlSkCanvasDispatcher::drawPaint() { |
| const SkPaint& sk_paint = paint(); |
| SkImageFilter* filter = sk_paint.getImageFilter(); |
| if (filter && !filter->asColorFilter(nullptr)) { |
| // drawPaint does an implicit saveLayer if an SkImageFilter is |
| // present that cannot be replaced by an SkColorFilter. |
| TRACE_EVENT0("flutter", "Canvas::saveLayer"); |
| } |
| canvas_->drawPaint(sk_paint); |
| } |
| void DlSkCanvasDispatcher::drawColor(DlColor color, DlBlendMode mode) { |
| // SkCanvas::drawColor(SkColor) does the following conversion anyway |
| // We do it here manually to increase precision on applying opacity |
| SkColor4f color4f = SkColor4f::FromColor(color); |
| color4f.fA *= opacity(); |
| canvas_->drawColor(color4f, ToSk(mode)); |
| } |
| void DlSkCanvasDispatcher::drawLine(const SkPoint& p0, const SkPoint& p1) { |
| canvas_->drawLine(p0, p1, paint()); |
| } |
| void DlSkCanvasDispatcher::drawRect(const SkRect& rect) { |
| canvas_->drawRect(rect, paint()); |
| } |
| void DlSkCanvasDispatcher::drawOval(const SkRect& bounds) { |
| canvas_->drawOval(bounds, paint()); |
| } |
| void DlSkCanvasDispatcher::drawCircle(const SkPoint& center, SkScalar radius) { |
| canvas_->drawCircle(center, radius, paint()); |
| } |
| void DlSkCanvasDispatcher::drawRRect(const SkRRect& rrect) { |
| canvas_->drawRRect(rrect, paint()); |
| } |
| void DlSkCanvasDispatcher::drawDRRect(const SkRRect& outer, |
| const SkRRect& inner) { |
| canvas_->drawDRRect(outer, inner, paint()); |
| } |
| void DlSkCanvasDispatcher::drawPath(const SkPath& path) { |
| canvas_->drawPath(path, paint()); |
| } |
| void DlSkCanvasDispatcher::drawArc(const SkRect& bounds, |
| SkScalar start, |
| SkScalar sweep, |
| bool useCenter) { |
| canvas_->drawArc(bounds, start, sweep, useCenter, paint()); |
| } |
| void DlSkCanvasDispatcher::drawPoints(PointMode mode, |
| uint32_t count, |
| const SkPoint pts[]) { |
| canvas_->drawPoints(ToSk(mode), count, pts, paint()); |
| } |
| void DlSkCanvasDispatcher::drawVertices(const DlVertices* vertices, |
| DlBlendMode mode) { |
| canvas_->drawVertices(ToSk(vertices), ToSk(mode), paint()); |
| } |
| void DlSkCanvasDispatcher::drawImage(const sk_sp<DlImage> image, |
| const SkPoint point, |
| DlImageSampling sampling, |
| bool render_with_attributes) { |
| canvas_->drawImage(image ? image->skia_image() : nullptr, point.fX, point.fY, |
| ToSk(sampling), safe_paint(render_with_attributes)); |
| } |
| void DlSkCanvasDispatcher::drawImageRect(const sk_sp<DlImage> image, |
| const SkRect& src, |
| const SkRect& dst, |
| DlImageSampling sampling, |
| bool render_with_attributes, |
| SrcRectConstraint constraint) { |
| canvas_->drawImageRect(image ? image->skia_image() : nullptr, src, dst, |
| ToSk(sampling), safe_paint(render_with_attributes), |
| ToSk(constraint)); |
| } |
| void DlSkCanvasDispatcher::drawImageNine(const sk_sp<DlImage> image, |
| const SkIRect& center, |
| const SkRect& dst, |
| DlFilterMode filter, |
| bool render_with_attributes) { |
| if (!image) { |
| return; |
| } |
| auto skia_image = image->skia_image(); |
| if (!skia_image) { |
| return; |
| } |
| canvas_->drawImageNine(skia_image.get(), center, dst, ToSk(filter), |
| safe_paint(render_with_attributes)); |
| } |
| void DlSkCanvasDispatcher::drawAtlas(const sk_sp<DlImage> atlas, |
| const SkRSXform xform[], |
| const SkRect tex[], |
| const DlColor colors[], |
| int count, |
| DlBlendMode mode, |
| DlImageSampling sampling, |
| const SkRect* cullRect, |
| bool render_with_attributes) { |
| if (!atlas) { |
| return; |
| } |
| auto skia_atlas = atlas->skia_image(); |
| if (!skia_atlas) { |
| return; |
| } |
| const SkColor* sk_colors = reinterpret_cast<const SkColor*>(colors); |
| canvas_->drawAtlas(skia_atlas.get(), xform, tex, sk_colors, count, ToSk(mode), |
| ToSk(sampling), cullRect, |
| safe_paint(render_with_attributes)); |
| } |
| void DlSkCanvasDispatcher::drawDisplayList( |
| const sk_sp<DisplayList> display_list, |
| SkScalar opacity) { |
| int restore_count; |
| |
| // Compute combined opacity and figure out whether we can apply it |
| // during dispatch or if we need a saveLayer. |
| SkScalar combined_opacity = opacity * this->opacity(); |
| if (combined_opacity < SK_Scalar1 && |
| !display_list->can_apply_group_opacity()) { |
| SkPaint save_paint; |
| save_paint.setAlphaf(combined_opacity); |
| restore_count = canvas_->saveLayer(display_list->bounds(), &save_paint); |
| combined_opacity = SK_Scalar1; |
| } else { |
| restore_count = canvas_->save(); |
| } |
| |
| // Create a new CanvasDispatcher to isolate the actions of the |
| // display_list from the current environment. |
| DlSkCanvasDispatcher dispatcher(canvas_, combined_opacity); |
| if (display_list->rtree()) { |
| display_list->Dispatch(dispatcher, canvas_->getLocalClipBounds()); |
| } else { |
| display_list->Dispatch(dispatcher); |
| } |
| |
| // Restore canvas state to what it was before dispatching. |
| canvas_->restoreToCount(restore_count); |
| } |
| void DlSkCanvasDispatcher::drawTextBlob(const sk_sp<SkTextBlob> blob, |
| SkScalar x, |
| SkScalar y) { |
| canvas_->drawTextBlob(blob, x, y, paint()); |
| } |
| |
| void DlSkCanvasDispatcher::DrawShadow(SkCanvas* canvas, |
| const SkPath& path, |
| DlColor color, |
| float elevation, |
| bool transparentOccluder, |
| SkScalar dpr) { |
| const SkScalar kAmbientAlpha = 0.039f; |
| const SkScalar kSpotAlpha = 0.25f; |
| |
| uint32_t flags = transparentOccluder |
| ? SkShadowFlags::kTransparentOccluder_ShadowFlag |
| : SkShadowFlags::kNone_ShadowFlag; |
| flags |= SkShadowFlags::kDirectionalLight_ShadowFlag; |
| SkColor in_ambient = SkColorSetA(color, kAmbientAlpha * SkColorGetA(color)); |
| SkColor in_spot = SkColorSetA(color, kSpotAlpha * SkColorGetA(color)); |
| SkColor ambient_color, spot_color; |
| SkShadowUtils::ComputeTonalColors(in_ambient, in_spot, &ambient_color, |
| &spot_color); |
| SkShadowUtils::DrawShadow( |
| canvas, path, SkPoint3::Make(0, 0, dpr * elevation), |
| SkPoint3::Make(0, -1, 1), |
| DlCanvas::kShadowLightRadius / DlCanvas::kShadowLightHeight, |
| ambient_color, spot_color, flags); |
| } |
| |
| void DlSkCanvasDispatcher::drawShadow(const SkPath& path, |
| const DlColor color, |
| const SkScalar elevation, |
| bool transparent_occluder, |
| SkScalar dpr) { |
| DrawShadow(canvas_, path, color, elevation, transparent_occluder, dpr); |
| } |
| |
| } // namespace flutter |
