flutter::Paint Class Reference

#include <paint.h>

Public Member Functions
	Paint ()=default
	Paint (Dart_Handle paint_objects, Dart_Handle paint_data)
const DlPaint *	paint (DlPaint &paint, const DisplayListAttributeFlags &flags) const
void	toDlPaint (DlPaint &paint) const
bool	isNull () const
bool	isNotNull () const

Friends
struct	tonic::DartConverter< Paint >

Detailed Description

Definition at line 15 of file paint.h.

Constructor & Destructor Documentation

Paint() [1/2]

flutter::Paint::Paint ( )

default

Paint() [2/2]

Paint::Paint	(	Dart_Handle	paint_objects,
		Dart_Handle	paint_data
	)

Definition at line 61 of file paint.cc.

    : paint_objects_(paint_objects), paint_data_(paint_data) {}

Member Function Documentation

isNotNull()

bool flutter::Paint::isNotNull ( ) const

inline

Definition at line 26 of file paint.h.

{ return !Dart_IsNull(paint_data_); }

isNull()

bool flutter::Paint::isNull ( ) const

inline

Definition at line 25 of file paint.h.

{ return Dart_IsNull(paint_data_); }

paint()

const DlPaint * Paint::paint	(	DlPaint &	paint,
		const DisplayListAttributeFlags &	flags
	)		const

Definition at line 64 of file paint.cc.

                                                                          {
  if (isNull()) {
    return nullptr;
  }
  tonic::DartByteData byte_data(paint_data_);
  FML_CHECK(byte_data.length_in_bytes() == kDataByteCount);
 
  const uint32_t* uint_data = static_cast<const uint32_t*>(byte_data.data());
  const float* float_data = static_cast<const float*>(byte_data.data());
 
  Dart_Handle values[kObjectCount];
  if (Dart_IsNull(paint_objects_)) {
    if (flags.applies_shader()) {
      paint.setColorSource(nullptr);
    }
    if (flags.applies_color_filter()) {
      paint.setColorFilter(nullptr);
    }
    if (flags.applies_image_filter()) {
      paint.setImageFilter(nullptr);
    }
  } else {
    FML_DCHECK(Dart_IsList(paint_objects_));
    intptr_t length = 0;
    Dart_ListLength(paint_objects_, &length);
 
    FML_CHECK(length == kObjectCount);
    if (Dart_IsError(
            Dart_ListGetRange(paint_objects_, 0, kObjectCount, values))) {
      return nullptr;
    }
 
    if (flags.applies_shader()) {
      Dart_Handle shader = values[kShaderIndex];
      if (Dart_IsNull(shader)) {
        paint.setColorSource(nullptr);
      } else {
        if (Shader* decoded = tonic::DartConverter<Shader*>::FromDart(shader)) {
          auto sampling =
              ImageFilter::SamplingFromIndex(uint_data[kFilterQualityIndex]);
          paint.setColorSource(decoded->shader(sampling));
        } else {
          paint.setColorSource(nullptr);
        }
      }
    }
 
    if (flags.applies_color_filter()) {
      Dart_Handle color_filter = values[kColorFilterIndex];
      if (Dart_IsNull(color_filter)) {
        paint.setColorFilter(nullptr);
      } else {
        ColorFilter* decoded =
            tonic::DartConverter<ColorFilter*>::FromDart(color_filter);
        paint.setColorFilter(decoded->filter());
      }
    }
 
    if (flags.applies_image_filter()) {
      Dart_Handle image_filter = values[kImageFilterIndex];
      if (Dart_IsNull(image_filter)) {
        paint.setImageFilter(nullptr);
      } else {
        ImageFilter* decoded =
            tonic::DartConverter<ImageFilter*>::FromDart(image_filter);
        paint.setImageFilter(decoded->filter());
      }
    }
  }
 
  if (flags.applies_anti_alias()) {
    paint.setAntiAlias(uint_data[kIsAntiAliasIndex] == 0);
  }
 
  if (flags.applies_alpha_or_color()) {
    uint32_t encoded_color = uint_data[kColorIndex];
    paint.setColor(DlColor(encoded_color ^ kColorDefault));
  }
 
  if (flags.applies_blend()) {
    uint32_t encoded_blend_mode = uint_data[kBlendModeIndex];
    uint32_t blend_mode = encoded_blend_mode ^ kBlendModeDefault;
    paint.setBlendMode(static_cast<DlBlendMode>(blend_mode));
  }
 
  if (flags.applies_style()) {
    uint32_t style = uint_data[kStyleIndex];
    paint.setDrawStyle(static_cast<DlDrawStyle>(style));
  }
 
  if (flags.is_stroked(paint.getDrawStyle())) {
    float stroke_width = float_data[kStrokeWidthIndex];
    paint.setStrokeWidth(stroke_width);
 
    float stroke_miter_limit = float_data[kStrokeMiterLimitIndex];
    paint.setStrokeMiter(stroke_miter_limit + kStrokeMiterLimitDefault);
 
    uint32_t stroke_cap = uint_data[kStrokeCapIndex];
    paint.setStrokeCap(static_cast<DlStrokeCap>(stroke_cap));
 
    uint32_t stroke_join = uint_data[kStrokeJoinIndex];
    paint.setStrokeJoin(static_cast<DlStrokeJoin>(stroke_join));
  }
 
  if (flags.applies_color_filter()) {
    paint.setInvertColors(uint_data[kInvertColorIndex] != 0);
  }
 
  if (flags.applies_path_effect()) {
    // The paint API exposed to Dart does not support path effects.  But other
    // operations such as text may set a path effect, which must be cleared.
    paint.setPathEffect(nullptr);
  }
 
  if (flags.applies_mask_filter()) {
    switch (uint_data[kMaskFilterIndex]) {
      case kNull:
        paint.setMaskFilter(nullptr);
        break;
      case kBlur:
        DlBlurStyle blur_style =
            static_cast<DlBlurStyle>(uint_data[kMaskFilterBlurStyleIndex]);
        double sigma = float_data[kMaskFilterSigmaIndex];
        paint.setMaskFilter(
            DlBlurMaskFilter::Make(blur_style, SafeNarrow(sigma)));
        break;
    }
  }
 
  return &paint;
}

toDlPaint()

void Paint::toDlPaint

(

DlPaint &

paint

)

const

Definition at line 197 of file paint.cc.

                                          {
  if (isNull()) {
    return;
  }
  FML_DCHECK(paint == DlPaint());
 
  tonic::DartByteData byte_data(paint_data_);
  FML_CHECK(byte_data.length_in_bytes() == kDataByteCount);
 
  const uint32_t* uint_data = static_cast<const uint32_t*>(byte_data.data());
  const float* float_data = static_cast<const float*>(byte_data.data());
 
  Dart_Handle values[kObjectCount];
  if (!Dart_IsNull(paint_objects_)) {
    FML_DCHECK(Dart_IsList(paint_objects_));
    intptr_t length = 0;
    Dart_ListLength(paint_objects_, &length);
 
    FML_CHECK(length == kObjectCount);
    if (Dart_IsError(
            Dart_ListGetRange(paint_objects_, 0, kObjectCount, values))) {
      return;
    }
 
    Dart_Handle shader = values[kShaderIndex];
    if (!Dart_IsNull(shader)) {
      if (Shader* decoded = tonic::DartConverter<Shader*>::FromDart(shader)) {
        auto sampling =
            ImageFilter::SamplingFromIndex(uint_data[kFilterQualityIndex]);
        paint.setColorSource(decoded->shader(sampling));
      }
    }
 
    Dart_Handle color_filter = values[kColorFilterIndex];
    if (!Dart_IsNull(color_filter)) {
      ColorFilter* decoded =
          tonic::DartConverter<ColorFilter*>::FromDart(color_filter);
      paint.setColorFilter(decoded->filter());
    }
 
    Dart_Handle image_filter = values[kImageFilterIndex];
    if (!Dart_IsNull(image_filter)) {
      ImageFilter* decoded =
          tonic::DartConverter<ImageFilter*>::FromDart(image_filter);
      paint.setImageFilter(decoded->filter());
    }
  }
 
  paint.setAntiAlias(uint_data[kIsAntiAliasIndex] == 0);
 
  uint32_t encoded_color = uint_data[kColorIndex];
  paint.setColor(DlColor(encoded_color ^ kColorDefault));
 
  uint32_t encoded_blend_mode = uint_data[kBlendModeIndex];
  uint32_t blend_mode = encoded_blend_mode ^ kBlendModeDefault;
  paint.setBlendMode(static_cast<DlBlendMode>(blend_mode));
 
  uint32_t style = uint_data[kStyleIndex];
  paint.setDrawStyle(static_cast<DlDrawStyle>(style));
 
  float stroke_width = float_data[kStrokeWidthIndex];
  paint.setStrokeWidth(stroke_width);
 
  float stroke_miter_limit = float_data[kStrokeMiterLimitIndex];
  paint.setStrokeMiter(stroke_miter_limit + kStrokeMiterLimitDefault);
 
  uint32_t stroke_cap = uint_data[kStrokeCapIndex];
  paint.setStrokeCap(static_cast<DlStrokeCap>(stroke_cap));
 
  uint32_t stroke_join = uint_data[kStrokeJoinIndex];
  paint.setStrokeJoin(static_cast<DlStrokeJoin>(stroke_join));
 
  paint.setInvertColors(uint_data[kInvertColorIndex] != 0);
 
  switch (uint_data[kMaskFilterIndex]) {
    case kNull:
      break;
    case kBlur:
      DlBlurStyle blur_style =
          static_cast<DlBlurStyle>(uint_data[kMaskFilterBlurStyleIndex]);
      float sigma = SafeNarrow(float_data[kMaskFilterSigmaIndex]);
      // Make could return a nullptr here if the values are NOP or
      // do not make sense. We could interpret that as if there was
      // no value passed from Dart at all (i.e. don't change the
      // setting in the paint object as in the kNull branch right
      // above here), but the maskfilter flag was actually set
      // indicating that the developer "tried" to set a mask, so we
      // should set the null value rather than do nothing.
      paint.setMaskFilter(DlBlurMaskFilter::Make(blur_style, sigma));
      break;
  }
}

Friends And Related Symbol Documentation

tonic::DartConverter< Paint >

friend struct tonic::DartConverter< Paint >

friend

Definition at line 26 of file paint.h.

---

The documentation for this class was generated from the following files:

• lib/ui/painting/paint.h
• lib/ui/painting/paint.cc