dl_dispatcher.cc File Reference

#include "impeller/display_list/dl_dispatcher.h"
#include <algorithm>
#include <cstring>
#include <memory>
#include <optional>
#include <vector>
#include "display_list/dl_sampling_options.h"
#include "display_list/effects/dl_image_filter.h"
#include "flutter/fml/logging.h"
#include "fml/closure.h"
#include "impeller/core/formats.h"
#include "impeller/display_list/aiks_context.h"
#include "impeller/display_list/canvas.h"
#include "impeller/display_list/dl_atlas_geometry.h"
#include "impeller/display_list/dl_image_impeller.h"
#include "impeller/display_list/dl_text_impeller.h"
#include "impeller/display_list/dl_vertices_geometry.h"
#include "impeller/display_list/nine_patch_converter.h"
#include "impeller/display_list/skia_conversions.h"
#include "impeller/entity/contents/atlas_contents.h"
#include "impeller/entity/contents/content_context.h"
#include "impeller/entity/contents/filters/filter_contents.h"
#include "impeller/entity/contents/filters/inputs/filter_input.h"
#include "impeller/entity/entity.h"
#include "impeller/entity/geometry/ellipse_geometry.h"
#include "impeller/entity/geometry/fill_path_geometry.h"
#include "impeller/entity/geometry/rect_geometry.h"
#include "impeller/entity/geometry/round_rect_geometry.h"
#include "impeller/entity/geometry/round_superellipse_geometry.h"
#include "impeller/geometry/color.h"
#include "impeller/geometry/scalar.h"
#include "impeller/geometry/sigma.h"
#include "impeller/typographer/font_glyph_pair.h"

Go to the source code of this file.

Namespaces
namespace	impeller

Macros
#define	USE_DEPTH_WATCHER   true
#define	AUTO_DEPTH_WATCHER(d)
#define	AUTO_DEPTH_CHECK()
#define	UNIMPLEMENTED    FML_DLOG(ERROR) << "Unimplemented detail in " << __FUNCTION__;

Functions
static impeller::SamplerDescriptor	impeller::ToSamplerDescriptor (const flutter::DlFilterMode options)
static std::optional< const Rect >	impeller::ToOptRect (const flutter::DlRect *rect)
static Paint::Style	impeller::ToStyle (flutter::DlDrawStyle style)
static FilterContents::BlurStyle	impeller::ToBlurStyle (flutter::DlBlurStyle blur_style)
static Entity::ClipOperation	impeller::ToClipOperation (flutter::DlClipOp clip_op)
static bool	impeller::RequiresReadbackForBlends (const ContentContext &renderer, flutter::DlBlendMode max_root_blend_mode)
	Subclasses.
std::shared_ptr< Texture >	impeller::DisplayListToTexture (const sk_sp< flutter::DisplayList > &display_list, ISize size, AiksContext &context, bool reset_host_buffer=true, bool generate_mips=false, std::optional< PixelFormat > target_pixel_format=std::nullopt)
	Render the provided display list to a texture with the given size.
bool	impeller::RenderToTarget (ContentContext &context, RenderTarget render_target, const sk_sp< flutter::DisplayList > &display_list, Rect cull_rect, bool reset_host_buffer, bool is_onscreen=true)
	Render the provided display list to the render target.

Macro Definition Documentation

AUTO_DEPTH_CHECK

#define AUTO_DEPTH_CHECK

(

)

Definition at line 116 of file dl_dispatcher.cc.

AUTO_DEPTH_WATCHER

#define AUTO_DEPTH_WATCHER

(

d

)

Definition at line 115 of file dl_dispatcher.cc.

UNIMPLEMENTED

#define UNIMPLEMENTED    FML_DLOG(ERROR) << "Unimplemented detail in " << __FUNCTION__;

Definition at line 120 of file dl_dispatcher.cc.

                                       {
  impeller::SamplerDescriptor desc;
  switch (options) {
    case flutter::DlFilterMode::kNearest:
      desc.min_filter = desc.mag_filter = impeller::MinMagFilter::kNearest;
      desc.label = "Nearest Sampler";
      break;
    case flutter::DlFilterMode::kLinear:
      desc.min_filter = desc.mag_filter = impeller::MinMagFilter::kLinear;
      desc.label = "Linear Sampler";
      break;
    default:
      break;
  }
  return desc;
}
 
static std::optional<const Rect> ToOptRect(const flutter::DlRect* rect) {
  if (rect == nullptr) {
    return std::nullopt;
  }
  return *rect;
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::setAntiAlias(bool aa) {
  AUTO_DEPTH_WATCHER(0u);
 
  paint_.anti_alias = aa;
}
 
static Paint::Style ToStyle(flutter::DlDrawStyle style) {
  switch (style) {
    case flutter::DlDrawStyle::kFill:
      return Paint::Style::kFill;
    case flutter::DlDrawStyle::kStroke:
      return Paint::Style::kStroke;
    case flutter::DlDrawStyle::kStrokeAndFill:
      UNIMPLEMENTED;
      break;
  }
  return Paint::Style::kFill;
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::setDrawStyle(flutter::DlDrawStyle style) {
  AUTO_DEPTH_WATCHER(0u);
 
  paint_.style = ToStyle(style);
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::setColor(flutter::DlColor color) {
  AUTO_DEPTH_WATCHER(0u);
 
  paint_.color = skia_conversions::ToColor(color);
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::setStrokeWidth(DlScalar width) {
  AUTO_DEPTH_WATCHER(0u);
 
  paint_.stroke.width = width;
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::setStrokeMiter(DlScalar limit) {
  AUTO_DEPTH_WATCHER(0u);
 
  paint_.stroke.miter_limit = limit;
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::setStrokeCap(flutter::DlStrokeCap cap) {
  AUTO_DEPTH_WATCHER(0u);
 
  switch (cap) {
    case flutter::DlStrokeCap::kButt:
      paint_.stroke.cap = Cap::kButt;
      break;
    case flutter::DlStrokeCap::kRound:
      paint_.stroke.cap = Cap::kRound;
      break;
    case flutter::DlStrokeCap::kSquare:
      paint_.stroke.cap = Cap::kSquare;
      break;
  }
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::setStrokeJoin(flutter::DlStrokeJoin join) {
  AUTO_DEPTH_WATCHER(0u);
 
  switch (join) {
    case flutter::DlStrokeJoin::kMiter:
      paint_.stroke.join = Join::kMiter;
      break;
    case flutter::DlStrokeJoin::kRound:
      paint_.stroke.join = Join::kRound;
      break;
    case flutter::DlStrokeJoin::kBevel:
      paint_.stroke.join = Join::kBevel;
      break;
  }
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::setColorSource(const flutter::DlColorSource* source) {
  AUTO_DEPTH_WATCHER(0u);
 
  paint_.color_source = source;
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::setColorFilter(const flutter::DlColorFilter* filter) {
  AUTO_DEPTH_WATCHER(0u);
 
  paint_.color_filter = filter;
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::setInvertColors(bool invert) {
  AUTO_DEPTH_WATCHER(0u);
 
  paint_.invert_colors = invert;
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::setBlendMode(flutter::DlBlendMode dl_mode) {
  AUTO_DEPTH_WATCHER(0u);
 
  paint_.blend_mode = dl_mode;
}
 
static FilterContents::BlurStyle ToBlurStyle(flutter::DlBlurStyle blur_style) {
  switch (blur_style) {
    case flutter::DlBlurStyle::kNormal:
      return FilterContents::BlurStyle::kNormal;
    case flutter::DlBlurStyle::kSolid:
      return FilterContents::BlurStyle::kSolid;
    case flutter::DlBlurStyle::kOuter:
      return FilterContents::BlurStyle::kOuter;
    case flutter::DlBlurStyle::kInner:
      return FilterContents::BlurStyle::kInner;
  }
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::setMaskFilter(const flutter::DlMaskFilter* filter) {
  AUTO_DEPTH_WATCHER(0u);
 
  // Needs https://github.com/flutter/flutter/issues/95434
  if (filter == nullptr) {
    paint_.mask_blur_descriptor = std::nullopt;
    return;
  }
  switch (filter->type()) {
    case flutter::DlMaskFilterType::kBlur: {
      auto blur = filter->asBlur();
 
      paint_.mask_blur_descriptor = {
          .style = ToBlurStyle(blur->style()),
          .sigma = Sigma(blur->sigma()),
          .respect_ctm = blur->respectCTM(),
      };
      break;
    }
  }
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::setImageFilter(const flutter::DlImageFilter* filter) {
  AUTO_DEPTH_WATCHER(0u);
 
  paint_.image_filter = filter;
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::save(uint32_t total_content_depth) {
  AUTO_DEPTH_WATCHER(1u);
 
  GetCanvas().Save(total_content_depth);
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::saveLayer(const DlRect& bounds,
                                 const flutter::SaveLayerOptions& options,
                                 uint32_t total_content_depth,
                                 flutter::DlBlendMode max_content_mode,
                                 const flutter::DlImageFilter* backdrop,
                                 std::optional<int64_t> backdrop_id) {
  AUTO_DEPTH_WATCHER(1u);
 
  auto paint = options.renders_with_attributes() ? paint_ : Paint{};
  auto promise = options.content_is_clipped()
                     ? ContentBoundsPromise::kMayClipContents
                     : ContentBoundsPromise::kContainsContents;
  std::optional<Rect> impeller_bounds;
  // If the content is unbounded but has developer specified bounds, we take
  // the original bounds so that we clip the content as expected.
  if (!options.content_is_unbounded() || options.bounds_from_caller()) {
    impeller_bounds = bounds;
  }
 
  GetCanvas().SaveLayer(
      paint, impeller_bounds, backdrop, promise, total_content_depth,
      // Unbounded content can still have user specified bounds that require a
      // saveLayer to be created to perform the clip.
      options.can_distribute_opacity() && !options.content_is_unbounded(),
      backdrop_id  //
  );
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::restore() {
  GetCanvas().Restore();
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::translate(DlScalar tx, DlScalar ty) {
  AUTO_DEPTH_WATCHER(0u);
 
  GetCanvas().Translate({tx, ty, 0.0});
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::scale(DlScalar sx, DlScalar sy) {
  AUTO_DEPTH_WATCHER(0u);
 
  GetCanvas().Scale({sx, sy, 1.0});
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::rotate(DlScalar degrees) {
  AUTO_DEPTH_WATCHER(0u);
 
  GetCanvas().Rotate(Degrees{degrees});
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::skew(DlScalar sx, DlScalar sy) {
  AUTO_DEPTH_WATCHER(0u);
 
  GetCanvas().Skew(sx, sy);
}
 
// clang-format off
// |flutter::DlOpReceiver|
void DlDispatcherBase::transform2DAffine(
    DlScalar mxx, DlScalar mxy, DlScalar mxt,
    DlScalar myx, DlScalar myy, DlScalar myt) {
  AUTO_DEPTH_WATCHER(0u);
 
  transformFullPerspective(
      mxx, mxy,  0, mxt,
      myx, myy,  0, myt,
      0  ,   0,  1,   0,
      0  ,   0,  0,   1
  );
}
// clang-format on
 
// clang-format off
// |flutter::DlOpReceiver|
void DlDispatcherBase::transformFullPerspective(
    DlScalar mxx, DlScalar mxy, DlScalar mxz, DlScalar mxt,
    DlScalar myx, DlScalar myy, DlScalar myz, DlScalar myt,
    DlScalar mzx, DlScalar mzy, DlScalar mzz, DlScalar mzt,
    DlScalar mwx, DlScalar mwy, DlScalar mwz, DlScalar mwt) {
  AUTO_DEPTH_WATCHER(0u);
 
  // The order of arguments is row-major but Impeller matrices are
  // column-major.
  auto transform = Matrix{
      mxx, myx, mzx, mwx,
      mxy, myy, mzy, mwy,
      mxz, myz, mzz, mwz,
      mxt, myt, mzt, mwt
  };
  GetCanvas().Transform(transform);
}
// clang-format on
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::transformReset() {
  AUTO_DEPTH_WATCHER(0u);
 
  GetCanvas().ResetTransform();
  GetCanvas().Transform(initial_matrix_);
}
 
static Entity::ClipOperation ToClipOperation(flutter::DlClipOp clip_op) {
  switch (clip_op) {
    case flutter::DlClipOp::kDifference:
      return Entity::ClipOperation::kDifference;
    case flutter::DlClipOp::kIntersect:
      return Entity::ClipOperation::kIntersect;
  }
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::clipRect(const DlRect& rect,
                                flutter::DlClipOp clip_op,
                                bool is_aa) {
  AUTO_DEPTH_WATCHER(0u);
 
  FillRectGeometry geom(rect);
  GetCanvas().ClipGeometry(geom, ToClipOperation(clip_op), /*is_aa=*/is_aa);
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::clipOval(const DlRect& bounds,
                                flutter::DlClipOp clip_op,
                                bool is_aa) {
  AUTO_DEPTH_WATCHER(0u);
 
  EllipseGeometry geom(bounds);
  GetCanvas().ClipGeometry(geom, ToClipOperation(clip_op));
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::clipRoundRect(const DlRoundRect& rrect,
                                     flutter::DlClipOp sk_op,
                                     bool is_aa) {
  AUTO_DEPTH_WATCHER(0u);
 
  auto clip_op = ToClipOperation(sk_op);
  if (rrect.IsRect()) {
    FillRectGeometry geom(rrect.GetBounds());
    GetCanvas().ClipGeometry(geom, clip_op, /*is_aa=*/is_aa);
  } else if (rrect.IsOval()) {
    EllipseGeometry geom(rrect.GetBounds());
    GetCanvas().ClipGeometry(geom, clip_op);
  } else if (rrect.GetRadii().AreAllCornersSame()) {
    RoundRectGeometry geom(rrect.GetBounds(), rrect.GetRadii().top_left);
    GetCanvas().ClipGeometry(geom, clip_op);
  } else {
    FillRoundRectGeometry geom(rrect);
    GetCanvas().ClipGeometry(geom, clip_op);
  }
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::clipRoundSuperellipse(const DlRoundSuperellipse& rse,
                                             flutter::DlClipOp sk_op,
                                             bool is_aa) {
  AUTO_DEPTH_WATCHER(0u);
 
  auto clip_op = ToClipOperation(sk_op);
  if (rse.IsRect()) {
    FillRectGeometry geom(rse.GetBounds());
    GetCanvas().ClipGeometry(geom, clip_op, /*is_aa=*/is_aa);
  } else if (rse.IsOval()) {
    EllipseGeometry geom(rse.GetBounds());
    GetCanvas().ClipGeometry(geom, clip_op);
  } else {
    RoundSuperellipseGeometry geom(rse.GetBounds(), rse.GetRadii());
    GetCanvas().ClipGeometry(geom, clip_op);
  }
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::clipPath(const DlPath& path,
                                flutter::DlClipOp sk_op,
                                bool is_aa) {
  AUTO_DEPTH_WATCHER(0u);
 
  auto clip_op = ToClipOperation(sk_op);
 
  DlRect rect;
  if (path.IsRect(&rect)) {
    FillRectGeometry geom(rect);
    GetCanvas().ClipGeometry(geom, clip_op, /*is_aa=*/is_aa);
  } else if (path.IsOval(&rect)) {
    EllipseGeometry geom(rect);
    GetCanvas().ClipGeometry(geom, clip_op);
  } else {
    DlRoundRect rrect;
    if (path.IsRoundRect(&rrect) && rrect.GetRadii().AreAllCornersSame()) {
      RoundRectGeometry geom(rrect.GetBounds(), rrect.GetRadii().top_left);
      GetCanvas().ClipGeometry(geom, clip_op);
    } else {
      FillPathGeometry geom(path);
      GetCanvas().ClipGeometry(geom, clip_op);
    }
  }
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawColor(flutter::DlColor color,
                                 flutter::DlBlendMode dl_mode) {
  AUTO_DEPTH_WATCHER(1u);
 
  Paint paint;
  paint.color = skia_conversions::ToColor(color);
  paint.blend_mode = dl_mode;
  GetCanvas().DrawPaint(paint);
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawPaint() {
  AUTO_DEPTH_WATCHER(1u);
 
  GetCanvas().DrawPaint(paint_);
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawLine(const DlPoint& p0, const DlPoint& p1) {
  AUTO_DEPTH_WATCHER(1u);
 
  GetCanvas().DrawLine(p0, p1, paint_);
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawDashedLine(const DlPoint& p0,
                                      const DlPoint& p1,
                                      DlScalar on_length,
                                      DlScalar off_length) {
  AUTO_DEPTH_WATCHER(1u);
 
  GetCanvas().DrawDashedLine(p0, p1, on_length, off_length, paint_);
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawRect(const DlRect& rect) {
  AUTO_DEPTH_WATCHER(1u);
 
  GetCanvas().DrawRect(rect, paint_);
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawOval(const DlRect& bounds) {
  AUTO_DEPTH_WATCHER(1u);
 
  GetCanvas().DrawOval(bounds, paint_);
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawCircle(const DlPoint& center, DlScalar radius) {
  AUTO_DEPTH_WATCHER(1u);
 
  GetCanvas().DrawCircle(center, radius, paint_);
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawRoundRect(const DlRoundRect& rrect) {
  AUTO_DEPTH_WATCHER(1u);
 
  GetCanvas().DrawRoundRect(rrect, paint_);
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawDiffRoundRect(const DlRoundRect& outer,
                                         const DlRoundRect& inner) {
  AUTO_DEPTH_WATCHER(1u);
 
  GetCanvas().DrawDiffRoundRect(outer, inner, paint_);
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawRoundSuperellipse(const DlRoundSuperellipse& rse) {
  AUTO_DEPTH_WATCHER(1u);
 
  GetCanvas().DrawRoundSuperellipse(rse, paint_);
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawPath(const DlPath& path) {
  AUTO_DEPTH_WATCHER(1u);
 
  GetCanvas().DrawPath(path, paint_);
}
 
void DlDispatcherBase::SimplifyOrDrawPath(Canvas& canvas,
                                          const DlPath& path,
                                          const Paint& paint) {
  DlRect rect;
 
  // We can't "optimize" a path into a rectangle if it's open.
  bool closed;
  if (path.IsRect(&rect, &closed) && closed) {
    canvas.DrawRect(rect, paint);
    return;
  }
 
  DlRoundRect rrect;
  if (path.IsRoundRect(&rrect) && rrect.GetRadii().AreAllCornersSame()) {
    canvas.DrawRoundRect(rrect, paint);
    return;
  }
 
  if (path.IsOval(&rect)) {
    canvas.DrawOval(rect, paint);
    return;
  }
 
  DlPoint start;
  DlPoint end;
  if (path.IsLine(&start, &end)) {
    canvas.DrawLine(start, end, paint);
    return;
  }
 
  canvas.DrawPath(path, paint);
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawArc(const DlRect& oval_bounds,
                               DlScalar start_degrees,
                               DlScalar sweep_degrees,
                               bool use_center) {
  AUTO_DEPTH_WATCHER(1u);
 
  GetCanvas().DrawArc(Arc(oval_bounds, Degrees(start_degrees),
                          Degrees(sweep_degrees), use_center),
                      paint_);
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawPoints(flutter::DlPointMode mode,
                                  uint32_t count,
                                  const DlPoint points[]) {
  AUTO_DEPTH_WATCHER(1u);
 
  Paint paint = paint_;
  paint.style = Paint::Style::kStroke;
  switch (mode) {
    case flutter::DlPointMode::kPoints: {
      // Cap::kButt is also treated as a square.
      PointStyle point_style = paint.stroke.cap == Cap::kRound
                                   ? PointStyle::kRound
                                   : PointStyle::kSquare;
      Scalar radius = paint.stroke.width;
      if (radius > 0) {
        radius /= 2.0;
      }
      GetCanvas().DrawPoints(points, count, radius, paint, point_style);
    } break;
    case flutter::DlPointMode::kLines:
      for (uint32_t i = 1; i < count; i += 2) {
        Point p0 = points[i - 1];
        Point p1 = points[i];
        GetCanvas().DrawLine(p0, p1, paint, /*reuse_depth=*/i > 1);
      }
      break;
    case flutter::DlPointMode::kPolygon:
      if (count > 1) {
        Point p0 = points[0];
        for (uint32_t i = 1; i < count; i++) {
          Point p1 = points[i];
          GetCanvas().DrawLine(p0, p1, paint, /*reuse_depth=*/i > 1);
          p0 = p1;
        }
      }
      break;
  }
}
 
std::shared_ptr<Texture> DlDispatcherBase::GetTexture(
    const sk_sp<flutter::DlImage>& image) {
  if (!image) {
    return nullptr;
  }
  return image->asImpellerImage()->GetCachedTexture(GetContentContext());
}
 
void DlDispatcherBase::drawVertices(
    const std::shared_ptr<flutter::DlVertices>& vertices,
    flutter::DlBlendMode dl_mode) {}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawImage(const sk_sp<flutter::DlImage> image,
                                 const DlPoint& point,
                                 flutter::DlImageSampling sampling,
                                 bool render_with_attributes) {
  AUTO_DEPTH_WATCHER(1u);
 
  if (!image) {
    return;
  }
 
  auto texture = GetTexture(image);
  if (!texture) {
    return;
  }
 
  const auto size = texture->GetSize();
  const auto src = DlRect::MakeWH(size.width, size.height);
  const auto dest = DlRect::MakeXYWH(point.x, point.y, size.width, size.height);
 
  drawImageRect(image,                                 // image
                src,                                   // source rect
                dest,                                  // destination rect
                sampling,                              // sampling options
                render_with_attributes,                // render with attributes
                flutter::DlSrcRectConstraint::kStrict  // constraint
  );
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawImageRect(const sk_sp<flutter::DlImage> image,
                                     const DlRect& src,
                                     const DlRect& dst,
                                     flutter::DlImageSampling sampling,
                                     bool render_with_attributes,
                                     flutter::DlSrcRectConstraint constraint =
                                         flutter::DlSrcRectConstraint::kFast) {
  AUTO_DEPTH_WATCHER(1u);
 
  GetCanvas().DrawImageRect(
      GetTexture(image),                               // image
      src,                                             // source rect
      dst,                                             // destination rect
      render_with_attributes ? paint_ : Paint(),       // paint
      skia_conversions::ToSamplerDescriptor(sampling)  // sampling
  );
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawImageNine(const sk_sp<flutter::DlImage> image,
                                     const DlIRect& center,
                                     const DlRect& dst,
                                     flutter::DlFilterMode filter,
                                     bool render_with_attributes) {
  AUTO_DEPTH_WATCHER(9u);
 
  NinePatchConverter converter = {};
  converter.DrawNinePatch(GetTexture(image),
                          Rect::MakeLTRB(center.GetLeft(), center.GetTop(),
                                         center.GetRight(), center.GetBottom()),
                          dst, ToSamplerDescriptor(filter), &GetCanvas(),
                          &paint_);
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawAtlas(const sk_sp<flutter::DlImage> atlas,
                                 const RSTransform xform[],
                                 const DlRect tex[],
                                 const flutter::DlColor colors[],
                                 int count,
                                 flutter::DlBlendMode mode,
                                 flutter::DlImageSampling sampling,
                                 const DlRect* cull_rect,
                                 bool render_with_attributes) {
  AUTO_DEPTH_WATCHER(1u);
 
  auto geometry =
      DlAtlasGeometry(GetTexture(atlas),                                //
                      xform,                                            //
                      tex,                                              //
                      colors,                                           //
                      static_cast<size_t>(count),                       //
                      mode,                                             //
                      skia_conversions::ToSamplerDescriptor(sampling),  //
                      ToOptRect(cull_rect)                              //
      );
  auto atlas_contents = std::make_shared<AtlasContents>();
  atlas_contents->SetGeometry(&geometry);
 
  GetCanvas().DrawAtlas(atlas_contents, paint_);
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawDisplayList(
    const sk_sp<flutter::DisplayList> display_list,
    DlScalar opacity) {
  AUTO_DEPTH_WATCHER(display_list->total_depth());
 
  // Save all values that must remain untouched after the operation.
  Paint saved_paint = paint_;
  Matrix saved_initial_matrix = initial_matrix_;
 
  // Establish a new baseline for interpreting the new DL.
  // Matrix and clip are left untouched, the current
  // transform is saved as the new base matrix, and paint
  // values are reset to defaults.
  initial_matrix_ = GetCanvas().GetCurrentTransform();
  paint_ = Paint();
 
  // Handle passed opacity in the most brute-force way by using
  // a SaveLayer. If the display_list is able to inherit the
  // opacity, this could also be handled by modulating all of its
  // attribute settings (for example, color), by the indicated
  // opacity.
  int restore_count = GetCanvas().GetSaveCount();
  if (opacity < SK_Scalar1) {
    Paint save_paint;
    save_paint.color = Color(0, 0, 0, opacity);
    GetCanvas().SaveLayer(save_paint, display_list->GetBounds(), nullptr,
                          ContentBoundsPromise::kContainsContents,
                          display_list->total_depth(),
                          display_list->can_apply_group_opacity());
  } else {
    // The display list may alter the clip, which must be restored to the
    // current clip at the end of playback.
    GetCanvas().Save(display_list->total_depth());
  }
 
  // TODO(131445): Remove this restriction if we can correctly cull with
  // perspective transforms.
  if (display_list->has_rtree() && !initial_matrix_.HasPerspective()) {
    // The canvas remembers the screen-space culling bounds clipped by
    // the surface and the history of clip calls. DisplayList can cull
    // the ops based on a rectangle expressed in its "destination bounds"
    // so we need the canvas to transform those into the current local
    // coordinate space into which the DisplayList will be rendered.
    auto global_culling_bounds = GetCanvas().GetLocalCoverageLimit();
    if (global_culling_bounds.has_value()) {
      Rect cull_rect = global_culling_bounds->TransformBounds(
          GetCanvas().GetCurrentTransform().Invert());
      display_list->Dispatch(*this, cull_rect);
    } else {
      // If the culling bounds are empty, this display list can be skipped
      // entirely.
    }
  } else {
    display_list->Dispatch(*this);
  }
 
  // Restore all saved state back to what it was before we interpreted
  // the display_list
  AUTO_DEPTH_CHECK();
  GetCanvas().RestoreToCount(restore_count);
  initial_matrix_ = saved_initial_matrix;
  paint_ = saved_paint;
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawText(const std::shared_ptr<flutter::DlText>& text,
                                DlScalar x,
                                DlScalar y) {
  AUTO_DEPTH_WATCHER(1u);
 
  auto text_frame = text->GetTextFrame();
 
  // When running with Impeller enabled Skia text blobs are converted to
  // Impeller text frames in paragraph_skia.cc
  FML_CHECK(text_frame != nullptr);
  GetCanvas().DrawTextFrame(text_frame,             //
                            impeller::Point{x, y},  //
                            paint_                  //
  );
}
 
// |flutter::DlOpReceiver|
void DlDispatcherBase::drawShadow(const DlPath& path,
                                  const flutter::DlColor color,
                                  const DlScalar elevation,
                                  bool transparent_occluder,
                                  DlScalar dpr) {
  AUTO_DEPTH_WATCHER(1u);
 
  Color spot_color = skia_conversions::ToColor(color);
  spot_color.alpha *= 0.25;
 
  // Compute the spot color -- ported from SkShadowUtils::ComputeTonalColors.
  {
    Scalar max =
        std::max(std::max(spot_color.red, spot_color.green), spot_color.blue);
    Scalar min =
        std::min(std::min(spot_color.red, spot_color.green), spot_color.blue);
    Scalar luminance = (min + max) * 0.5;
 
    Scalar alpha_adjust =
        (2.6f + (-2.66667f + 1.06667f * spot_color.alpha) * spot_color.alpha) *
        spot_color.alpha;
    Scalar color_alpha =
        (3.544762f + (-4.891428f + 2.3466f * luminance) * luminance) *
        luminance;
    color_alpha = std::clamp(alpha_adjust * color_alpha, 0.0f, 1.0f);
 
    Scalar greyscale_alpha =
        std::clamp(spot_color.alpha * (1 - 0.4f * luminance), 0.0f, 1.0f);
 
    Scalar color_scale = color_alpha * (1 - greyscale_alpha);
    Scalar tonal_alpha = color_scale + greyscale_alpha;
    Scalar unpremul_scale = tonal_alpha != 0 ? color_scale / tonal_alpha : 0;
    spot_color = Color(unpremul_scale * spot_color.red,
                       unpremul_scale * spot_color.green,
                       unpremul_scale * spot_color.blue, tonal_alpha);
  }
 
  Vector3 light_position(0, -1, 1);
  Scalar occluder_z = dpr * elevation;
 
  constexpr Scalar kLightRadius = 800 / 600;  // Light radius / light height
 
  Paint paint;
  paint.style = Paint::Style::kFill;
  paint.color = spot_color;
  paint.mask_blur_descriptor = Paint::MaskBlurDescriptor{
      .style = FilterContents::BlurStyle::kNormal,
      .sigma = Radius{kLightRadius * occluder_z /
                      GetCanvas().GetCurrentTransform().GetScale().y},
  };
 
  GetCanvas().Save(1u);
  GetCanvas().PreConcat(
      Matrix::MakeTranslation(Vector2(0, -occluder_z * light_position.y)));
 
  SimplifyOrDrawPath(GetCanvas(), path, paint);
  AUTO_DEPTH_CHECK();
 
  GetCanvas().Restore();
}
 
/// Subclasses
 
static bool RequiresReadbackForBlends(
    const ContentContext& renderer,
    flutter::DlBlendMode max_root_blend_mode) {
  return !renderer.GetDeviceCapabilities().SupportsFramebufferFetch() &&
         max_root_blend_mode > Entity::kLastPipelineBlendMode;
}
 
CanvasDlDispatcher::CanvasDlDispatcher(ContentContext& renderer,
                                       RenderTarget& render_target,
                                       bool is_onscreen,
                                       bool has_root_backdrop_filter,
                                       flutter::DlBlendMode max_root_blend_mode,
                                       IRect32 cull_rect)
    : DlDispatcherBase(),
      canvas_(renderer,
              render_target,
              is_onscreen,
              has_root_backdrop_filter ||
                  RequiresReadbackForBlends(renderer, max_root_blend_mode),
              cull_rect),
      renderer_(renderer) {}
 
Canvas& CanvasDlDispatcher::GetCanvas() {
  return canvas_;
}
 
const ContentContext& CanvasDlDispatcher::GetContentContext() const {
  return renderer_;
}
 
void CanvasDlDispatcher::drawVertices(
    const std::shared_ptr<flutter::DlVertices>& vertices,
    flutter::DlBlendMode dl_mode) {
  AUTO_DEPTH_WATCHER(1u);
 
  GetCanvas().DrawVertices(
      std::make_shared<DlVerticesGeometry>(vertices, renderer_), dl_mode,
      paint_);
}
 
void CanvasDlDispatcher::SetBackdropData(
    std::unordered_map<int64_t, BackdropData> backdrop,
    size_t backdrop_count) {
  GetCanvas().SetBackdropData(std::move(backdrop), backdrop_count);
}
 
//// Text Frame Dispatcher
 
FirstPassDispatcher::FirstPassDispatcher(const ContentContext& renderer,
                                         const Matrix& initial_matrix,
                                         const Rect cull_rect)
    : renderer_(renderer), matrix_(initial_matrix) {
  cull_rect_state_.push_back(cull_rect);
}
 
FirstPassDispatcher::~FirstPassDispatcher() {
  FML_DCHECK(cull_rect_state_.size() == 1);
}
 
void FirstPassDispatcher::save() {
  stack_.emplace_back(matrix_);
  cull_rect_state_.push_back(cull_rect_state_.back());
}
 
void FirstPassDispatcher::saveLayer(const DlRect& bounds,
                                    const flutter::SaveLayerOptions options,
                                    const flutter::DlImageFilter* backdrop,
                                    std::optional<int64_t> backdrop_id) {
  save();
 
  backdrop_count_ += (backdrop == nullptr ? 0 : 1);
  if (backdrop != nullptr && backdrop_id.has_value()) {
    std::shared_ptr<flutter::DlImageFilter> shared_backdrop =
        backdrop->shared();
    std::unordered_map<int64_t, BackdropData>::iterator existing =
        backdrop_data_.find(backdrop_id.value());
    if (existing == backdrop_data_.end()) {
      backdrop_data_[backdrop_id.value()] =
          BackdropData{.backdrop_count = 1, .last_backdrop = shared_backdrop};
    } else {
      BackdropData& data = existing->second;
      data.backdrop_count++;
      if (data.all_filters_equal) {
        data.all_filters_equal = (*data.last_backdrop == *shared_backdrop);
        data.last_backdrop = shared_backdrop;
      }
    }
  }
 
  // This dispatcher does not track enough state to accurately compute
  // cull rects with image filters.
  auto global_cull_rect = cull_rect_state_.back();
  if (has_image_filter_ || global_cull_rect.IsMaximum()) {
    cull_rect_state_.back() = Rect::MakeMaximum();
  } else {
    auto global_save_bounds = bounds.TransformBounds(matrix_);
    auto new_cull_rect = global_cull_rect.Intersection(global_save_bounds);
    if (new_cull_rect.has_value()) {
      cull_rect_state_.back() = new_cull_rect.value();
    } else {
      cull_rect_state_.back() = Rect::MakeLTRB(0, 0, 0, 0);
    }
  }
}
 
void FirstPassDispatcher::restore() {
  matrix_ = stack_.back();
  stack_.pop_back();
  cull_rect_state_.pop_back();
}
 
void FirstPassDispatcher::translate(DlScalar tx, DlScalar ty) {
  matrix_ = matrix_.Translate({tx, ty});
}
 
void FirstPassDispatcher::scale(DlScalar sx, DlScalar sy) {
  matrix_ = matrix_.Scale({sx, sy, 1.0f});
}
 
void FirstPassDispatcher::rotate(DlScalar degrees) {
  matrix_ = matrix_ * Matrix::MakeRotationZ(Degrees(degrees));
}
 
void FirstPassDispatcher::skew(DlScalar sx, DlScalar sy) {
  matrix_ = matrix_ * Matrix::MakeSkew(sx, sy);
}
 
// clang-format off
// 2x3 2D affine subset of a 4x4 transform in row major order
void FirstPassDispatcher::transform2DAffine(
    DlScalar mxx, DlScalar mxy, DlScalar mxt,
    DlScalar myx, DlScalar myy, DlScalar myt) {
  matrix_ = matrix_ * Matrix::MakeColumn(
      mxx,  myx,  0.0f, 0.0f,
      mxy,  myy,  0.0f, 0.0f,
      0.0f, 0.0f, 1.0f, 0.0f,
      mxt,  myt,  0.0f, 1.0f
  );
}
// clang-format on
 
// clang-format off
// full 4x4 transform in row major order
void FirstPassDispatcher::transformFullPerspective(
    DlScalar mxx, DlScalar mxy, DlScalar mxz, DlScalar mxt,
    DlScalar myx, DlScalar myy, DlScalar myz, DlScalar myt,
    DlScalar mzx, DlScalar mzy, DlScalar mzz, DlScalar mzt,
    DlScalar mwx, DlScalar mwy, DlScalar mwz, DlScalar mwt) {
  matrix_ = matrix_ * Matrix::MakeColumn(
      mxx, myx, mzx, mwx,
      mxy, myy, mzy, mwy,
      mxz, myz, mzz, mwz,
      mxt, myt, mzt, mwt
  );
}
// clang-format on
 
void FirstPassDispatcher::transformReset() {
  matrix_ = Matrix();
}
 
void FirstPassDispatcher::drawText(const std::shared_ptr<flutter::DlText>& text,
                                   DlScalar x,
                                   DlScalar y) {
  GlyphProperties properties;
  auto text_frame = text->GetTextFrame();
  if (text_frame == nullptr) {
    return;
  }
 
  properties.stroke = paint_.GetStroke();
 
  if (text_frame->HasColor()) {
    // Alpha is always applied when rendering, remove it here so
    // we do not double-apply the alpha.
    properties.tone_or_color = paint_.color.WithAlpha(1.0);
  } else {
    properties.tone_or_color = GlyphProperties::ComputeTone(paint_.color);
  }
 
  renderer_.GetLazyGlyphAtlas()->AddTextFrame(text_frame,   //
                                              Point(x, y),  //
                                              matrix_,      //
                                              properties    //
  );
}
 
const Rect FirstPassDispatcher::GetCurrentLocalCullingBounds() const {
  auto cull_rect = cull_rect_state_.back();
  if (!cull_rect.IsEmpty() && !cull_rect.IsMaximum()) {
    Matrix inverse = matrix_.Invert();
    cull_rect = cull_rect.TransformBounds(inverse);
  }
  return cull_rect;
}
 
void FirstPassDispatcher::drawDisplayList(
    const sk_sp<flutter::DisplayList> display_list,
    DlScalar opacity) {
  [[maybe_unused]] size_t stack_depth = stack_.size();
  save();
  Paint old_paint = paint_;
  paint_ = Paint{};
  bool old_has_image_filter = has_image_filter_;
  has_image_filter_ = false;
 
  if (matrix_.HasPerspective()) {
    display_list->Dispatch(*this);
  } else {
    Rect local_cull_bounds = GetCurrentLocalCullingBounds();
    if (local_cull_bounds.IsMaximum()) {
      display_list->Dispatch(*this);
    } else if (!local_cull_bounds.IsEmpty()) {
      DlIRect cull_rect = DlIRect::RoundOut(local_cull_bounds);
      display_list->Dispatch(*this, cull_rect);
    }
  }
 
  restore();
  paint_ = old_paint;
  has_image_filter_ = old_has_image_filter;
  FML_DCHECK(stack_depth == stack_.size());
}
 
// |flutter::DlOpReceiver|
void FirstPassDispatcher::setDrawStyle(flutter::DlDrawStyle style) {
  paint_.style = ToStyle(style);
}
 
// |flutter::DlOpReceiver|
void FirstPassDispatcher::setColor(flutter::DlColor color) {
  paint_.color = skia_conversions::ToColor(color);
}
 
// |flutter::DlOpReceiver|
void FirstPassDispatcher::setStrokeWidth(DlScalar width) {
  paint_.stroke.width = width;
}
 
// |flutter::DlOpReceiver|
void FirstPassDispatcher::setStrokeMiter(DlScalar limit) {
  paint_.stroke.miter_limit = limit;
}
 
// |flutter::DlOpReceiver|
void FirstPassDispatcher::setStrokeCap(flutter::DlStrokeCap cap) {
  switch (cap) {
    case flutter::DlStrokeCap::kButt:
      paint_.stroke.cap = Cap::kButt;
      break;
    case flutter::DlStrokeCap::kRound:
      paint_.stroke.cap = Cap::kRound;
      break;
    case flutter::DlStrokeCap::kSquare:
      paint_.stroke.cap = Cap::kSquare;
      break;
  }
}
 
// |flutter::DlOpReceiver|
void FirstPassDispatcher::setStrokeJoin(flutter::DlStrokeJoin join) {
  switch (join) {
    case flutter::DlStrokeJoin::kMiter:
      paint_.stroke.join = Join::kMiter;
      break;
    case flutter::DlStrokeJoin::kRound:
      paint_.stroke.join = Join::kRound;
      break;
    case flutter::DlStrokeJoin::kBevel:
      paint_.stroke.join = Join::kBevel;
      break;
  }
}
 
// |flutter::DlOpReceiver|
void FirstPassDispatcher::setImageFilter(const flutter::DlImageFilter* filter) {
  if (filter == nullptr) {
    has_image_filter_ = false;
  } else {
    has_image_filter_ = true;
  }
}
 
namespace {
bool PixelFormatSupportsMSAA(std::optional<PixelFormat> pixel_format) {
  return !pixel_format.has_value();
}
}  // namespace
 
std::pair<std::unordered_map<int64_t, BackdropData>, size_t>
FirstPassDispatcher::TakeBackdropData() {
  std::unordered_map<int64_t, BackdropData> temp;
  std::swap(temp, backdrop_data_);
  return std::make_pair(temp, backdrop_count_);
}
 
std::shared_ptr<Texture> DisplayListToTexture(
    const sk_sp<flutter::DisplayList>& display_list,
    ISize size,
    AiksContext& context,
    bool reset_host_buffer,
    bool generate_mips,
    std::optional<PixelFormat> target_pixel_format) {
  int mip_count = 1;
  if (generate_mips) {
    mip_count = size.MipCount();
  }
  // Do not use the render target cache as the lifecycle of this texture
  // will outlive a particular frame.
  impeller::RenderTargetAllocator render_target_allocator =
      impeller::RenderTargetAllocator(
          context.GetContext()->GetResourceAllocator());
  impeller::RenderTarget target;
  if (context.GetContext()->GetCapabilities()->SupportsOffscreenMSAA() &&
      PixelFormatSupportsMSAA(target_pixel_format)) {
    target = render_target_allocator.CreateOffscreenMSAA(
        *context.GetContext(),  // context
        size,                   // size
        /*mip_count=*/mip_count,
        "Picture Snapshot MSAA",  // label
        impeller::RenderTarget::
            kDefaultColorAttachmentConfigMSAA,  // color_attachment_config
        std::nullopt,                           // stencil_attachment_config
        nullptr,                                // existing_color_msaa_texture
        nullptr,             // existing_color_resolve_texture
        nullptr,             // existing_depth_stencil_texture
        target_pixel_format  // target_format
    );
  } else {
    target = render_target_allocator.CreateOffscreen(
        *context.GetContext(),  // context
        size,                   // size
        /*mip_count=*/mip_count,
        "Picture Snapshot",  // label
        impeller::RenderTarget::
            kDefaultColorAttachmentConfig,  // color_attachment_config
        std::nullopt,                       // stencil_attachment_config
        nullptr,                            // existing_color_texture
        nullptr,                            // existing_depth_stencil_texture
        target_pixel_format                 // target_format
    );
  }
  if (!target.IsValid()) {
    return nullptr;
  }
 
  DlIRect cull_rect = DlIRect::MakeWH(size.width, size.height);
  impeller::FirstPassDispatcher collector(
      context.GetContentContext(), impeller::Matrix(), Rect::MakeSize(size));
  display_list->Dispatch(collector, cull_rect);
  impeller::CanvasDlDispatcher impeller_dispatcher(
      context.GetContentContext(),               //
      target,                                    //
      /*is_onscreen=*/false,                     //
      display_list->root_has_backdrop_filter(),  //
      display_list->max_root_blend_mode(),       //
      impeller::IRect32::MakeSize(size)          //
  );
  const auto& [data, count] = collector.TakeBackdropData();
  impeller_dispatcher.SetBackdropData(data, count);
  context.GetContentContext().GetTextShadowCache().MarkFrameStart();
  fml::ScopedCleanupClosure cleanup([&] {
    if (reset_host_buffer) {
      context.GetContentContext().GetTransientsDataBuffer().Reset();
      context.GetContentContext().GetTransientsIndexesBuffer().Reset();
    }
    context.GetContentContext().GetTextShadowCache().MarkFrameEnd();
    context.GetContentContext().GetLazyGlyphAtlas()->ResetTextFrames();
    context.GetContext()->DisposeThreadLocalCachedResources();
  });
 
  display_list->Dispatch(impeller_dispatcher, cull_rect);
  impeller_dispatcher.FinishRecording();
 
  return target.GetRenderTargetTexture();
}
 
bool RenderToTarget(ContentContext& context,
                    RenderTarget render_target,
                    const sk_sp<flutter::DisplayList>& display_list,
                    Rect cull_rect,
                    bool reset_host_buffer,
                    bool is_onscreen) {
  FirstPassDispatcher collector(context, impeller::Matrix(), cull_rect);
  display_list->Dispatch(collector, cull_rect);
 
  impeller::CanvasDlDispatcher impeller_dispatcher(
      context,                                   //
      render_target,                             //
      /*is_onscreen=*/is_onscreen,               //
      display_list->root_has_backdrop_filter(),  //
      display_list->max_root_blend_mode(),       //
      IRect32::RoundOut(cull_rect)               //
  );
  const auto& [data, count] = collector.TakeBackdropData();
  impeller_dispatcher.SetBackdropData(data, count);
  context.GetTextShadowCache().MarkFrameStart();
  fml::ScopedCleanupClosure cleanup([&] {
    if (reset_host_buffer) {
      context.ResetTransientsBuffers();
    }
    context.GetTextShadowCache().MarkFrameEnd();
  });
 
  display_list->Dispatch(impeller_dispatcher, cull_rect);
  impeller_dispatcher.FinishRecording();
  context.GetLazyGlyphAtlas()->ResetTextFrames();
 
  return true;
}
 
}  // namespace impeller

USE_DEPTH_WATCHER

#define USE_DEPTH_WATCHER   true

Definition at line 44 of file dl_dispatcher.cc.