lib/ui/painting/color_filter.cc

// 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/lib/ui/painting/color_filter.h"

#include <cstring>

#include "flutter/lib/ui/ui_dart_state.h"
#include "third_party/tonic/converter/dart_converter.h"
#include "third_party/tonic/dart_args.h"
#include "third_party/tonic/dart_binding_macros.h"
#include "third_party/tonic/dart_library_natives.h"

namespace flutter {

IMPLEMENT_WRAPPERTYPEINFO(ui, ColorFilter);

void ColorFilter::Create(Dart_Handle wrapper) {
  UIDartState::ThrowIfUIOperationsProhibited();
  auto res = fml::MakeRefCounted<ColorFilter>();
  res->AssociateWithDartWrapper(wrapper);
}

void ColorFilter::initMode(int color, int blend_mode) {
  filter_ = DlBlendColorFilter::Make(static_cast<DlColor>(color),
                                     static_cast<DlBlendMode>(blend_mode));
}

void ColorFilter::initMatrix(const tonic::Float32List& color_matrix) {
  FML_CHECK(color_matrix.num_elements() == 20);

  // Flutter still defines the matrix to be biased by 255 in the last column
  // (translate). skia is normalized, treating the last column as 0...1, so we
  // post-scale here before calling the skia factory.
  float matrix[20];
  memcpy(matrix, color_matrix.data(), sizeof(matrix));
  matrix[4] *= 1.0f / 255;
  matrix[9] *= 1.0f / 255;
  matrix[14] *= 1.0f / 255;
  matrix[19] *= 1.0f / 255;
  filter_ = DlMatrixColorFilter::Make(matrix);
}

void ColorFilter::initLinearToSrgbGamma() {
  filter_ = DlLinearToSrgbGammaColorFilter::instance;
}

void ColorFilter::initSrgbToLinearGamma() {
  filter_ = DlSrgbToLinearGammaColorFilter::instance;
}

ColorFilter::~ColorFilter() = default;

}  // namespace flutter