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display_list_unittests.cc
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display_list_unittests.cc
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// 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 <array>
#include <cmath>
#include <memory>
#include <vector>
#include "display_list/display_list_blend_mode.h"
#include "display_list/display_list_color.h"
#include "display_list/display_list_color_filter.h"
#include "display_list/display_list_color_source.h"
#include "display_list/display_list_image_filter.h"
#include "display_list/display_list_paint.h"
#include "display_list/display_list_tile_mode.h"
#include "flutter/display_list/display_list_builder.h"
#include "flutter/display_list/display_list_mask_filter.h"
#include "flutter/display_list/types.h"
#include "flutter/testing/testing.h"
#include "impeller/display_list/display_list_image_impeller.h"
#include "impeller/display_list/display_list_playground.h"
#include "impeller/geometry/constants.h"
#include "impeller/geometry/point.h"
#include "impeller/playground/widgets.h"
#include "impeller/scene/node.h"
#include "third_party/imgui/imgui.h"
#include "third_party/skia/include/core/SkBlurTypes.h"
#include "third_party/skia/include/core/SkClipOp.h"
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkPathBuilder.h"
#include "third_party/skia/include/core/SkRRect.h"
namespace impeller {
namespace testing {
flutter::DlColor toColor(const float* components) {
return flutter::DlColor(Color::ToIColor(
Color(components[0], components[1], components[2], components[3])));
}
using DisplayListTest = DisplayListPlayground;
INSTANTIATE_PLAYGROUND_SUITE(DisplayListTest);
TEST_P(DisplayListTest, CanDrawRect) {
flutter::DisplayListBuilder builder;
builder.setColor(SK_ColorBLUE);
builder.drawRect(SkRect::MakeXYWH(10, 10, 100, 100));
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawTextBlob) {
flutter::DisplayListBuilder builder;
builder.setColor(SK_ColorBLUE);
builder.drawTextBlob(SkTextBlob::MakeFromString("Hello", CreateTestFont()),
100, 100);
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawTextBlobWithGradient) {
flutter::DisplayListBuilder builder;
std::vector<flutter::DlColor> colors = {flutter::DlColor::kBlue(),
flutter::DlColor::kRed()};
const float stops[2] = {0.0, 1.0};
auto linear = flutter::DlColorSource::MakeLinear({0.0, 0.0}, {300.0, 300.0},
2, colors.data(), stops,
flutter::DlTileMode::kClamp);
flutter::DlPaint paint;
paint.setColorSource(linear);
builder.DrawTextBlob(
SkTextBlob::MakeFromString("Hello World", CreateTestFont()), 100, 100,
paint);
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawTextWithSaveLayer) {
flutter::DisplayListBuilder builder;
builder.setColor(SK_ColorRED);
builder.drawTextBlob(SkTextBlob::MakeFromString("Hello", CreateTestFont()),
100, 100);
flutter::DlPaint save_paint;
float alpha = 0.5;
save_paint.setAlpha(static_cast<uint8_t>(255 * alpha));
builder.SaveLayer(nullptr, &save_paint);
builder.setColor(SK_ColorRED);
builder.drawTextBlob(SkTextBlob::MakeFromString("Hello with half alpha",
CreateTestFontOfSize(100)),
100, 300);
builder.restore();
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawImage) {
auto texture = CreateTextureForFixture("embarcadero.jpg");
flutter::DisplayListBuilder builder;
builder.drawImage(DlImageImpeller::Make(texture), SkPoint::Make(100, 100),
flutter::DlImageSampling::kNearestNeighbor, true);
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawCapsAndJoins) {
flutter::DisplayListBuilder builder;
builder.setStyle(flutter::DlDrawStyle::kStroke);
builder.setStrokeWidth(30);
builder.setColor(SK_ColorRED);
auto path =
SkPathBuilder{}.moveTo(-50, 0).lineTo(0, -50).lineTo(50, 0).snapshot();
builder.translate(100, 100);
{
builder.setStrokeCap(flutter::DlStrokeCap::kButt);
builder.setStrokeJoin(flutter::DlStrokeJoin::kMiter);
builder.setStrokeMiter(4);
builder.drawPath(path);
}
{
builder.save();
builder.translate(0, 100);
// The joint in the path is 45 degrees. A miter length of 1 convert to a
// bevel in this case.
builder.setStrokeMiter(1);
builder.drawPath(path);
builder.restore();
}
builder.translate(150, 0);
{
builder.setStrokeCap(flutter::DlStrokeCap::kSquare);
builder.setStrokeJoin(flutter::DlStrokeJoin::kBevel);
builder.drawPath(path);
}
builder.translate(150, 0);
{
builder.setStrokeCap(flutter::DlStrokeCap::kRound);
builder.setStrokeJoin(flutter::DlStrokeJoin::kRound);
builder.drawPath(path);
}
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawArc) {
auto callback = [&]() {
static float start_angle = 45;
static float sweep_angle = 270;
static float stroke_width = 10;
static bool use_center = true;
static int selected_cap = 0;
const char* cap_names[] = {"Butt", "Round", "Square"};
flutter::DlStrokeCap cap;
ImGui::Begin("Controls", nullptr, ImGuiWindowFlags_AlwaysAutoResize);
ImGui::SliderFloat("Start angle", &start_angle, -360, 360);
ImGui::SliderFloat("Sweep angle", &sweep_angle, -360, 360);
ImGui::SliderFloat("Stroke width", &stroke_width, 0, 100);
ImGui::Combo("Cap", &selected_cap, cap_names,
sizeof(cap_names) / sizeof(char*));
ImGui::Checkbox("Use center", &use_center);
ImGui::End();
switch (selected_cap) {
case 0:
cap = flutter::DlStrokeCap::kButt;
break;
case 1:
cap = flutter::DlStrokeCap::kRound;
break;
case 2:
cap = flutter::DlStrokeCap::kSquare;
break;
default:
cap = flutter::DlStrokeCap::kButt;
break;
}
auto [p1, p2] = IMPELLER_PLAYGROUND_LINE(
Point(200, 200), Point(400, 400), 20, Color::White(), Color::White());
flutter::DisplayListBuilder builder;
Vector2 scale = GetContentScale();
builder.scale(scale.x, scale.y);
builder.setStyle(flutter::DlDrawStyle::kStroke);
builder.setStrokeCap(cap);
builder.setStrokeJoin(flutter::DlStrokeJoin::kMiter);
builder.setStrokeMiter(10);
auto rect = SkRect::MakeLTRB(p1.x, p1.y, p2.x, p2.y);
builder.setColor(SK_ColorGREEN);
builder.setStrokeWidth(2);
builder.drawRect(rect);
builder.setColor(SK_ColorRED);
builder.setStrokeWidth(stroke_width);
builder.drawArc(rect, start_angle, sweep_angle, use_center);
return builder.Build();
};
ASSERT_TRUE(OpenPlaygroundHere(callback));
}
TEST_P(DisplayListTest, StrokedPathsDrawCorrectly) {
flutter::DisplayListBuilder builder;
builder.setColor(SK_ColorRED);
builder.setStyle(flutter::DlDrawStyle::kStroke);
builder.setStrokeWidth(10);
// Rectangle
builder.translate(100, 100);
builder.drawRect(SkRect::MakeSize({100, 100}));
// Rounded rectangle
builder.translate(150, 0);
builder.drawRRect(SkRRect::MakeRectXY(SkRect::MakeSize({100, 50}), 10, 10));
// Double rounded rectangle
builder.translate(150, 0);
builder.drawDRRect(
SkRRect::MakeRectXY(SkRect::MakeSize({100, 50}), 10, 10),
SkRRect::MakeRectXY(SkRect::MakeXYWH(10, 10, 80, 30), 10, 10));
// Contour with duplicate join points
{
builder.translate(150, 0);
SkPath path;
path.lineTo({100, 0});
path.lineTo({100, 0});
path.lineTo({100, 100});
builder.drawPath(path);
}
// Contour with duplicate end points
{
builder.setStrokeCap(flutter::DlStrokeCap::kRound);
builder.translate(150, 0);
SkPath path;
path.moveTo(0, 0);
path.lineTo({0, 0});
path.lineTo({50, 50});
path.lineTo({100, 0});
path.lineTo({100, 0});
builder.drawPath(path);
}
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawWithOddPathWinding) {
flutter::DisplayListBuilder builder;
builder.setColor(SK_ColorRED);
builder.setStyle(flutter::DlDrawStyle::kFill);
builder.translate(300, 300);
SkPath path;
path.setFillType(SkPathFillType::kEvenOdd);
path.addCircle(0, 0, 100);
path.addCircle(0, 0, 50);
builder.drawPath(path);
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawWithMaskBlur) {
auto texture = CreateTextureForFixture("embarcadero.jpg");
flutter::DisplayListBuilder builder;
// Mask blurred image.
{
auto filter = flutter::DlBlurMaskFilter(kNormal_SkBlurStyle, 10.0f);
builder.setMaskFilter(&filter);
builder.drawImage(DlImageImpeller::Make(texture), SkPoint::Make(100, 100),
flutter::DlImageSampling::kNearestNeighbor, true);
}
// Mask blurred filled path.
{
builder.setColor(SK_ColorYELLOW);
auto filter = flutter::DlBlurMaskFilter(kOuter_SkBlurStyle, 10.0f);
builder.setMaskFilter(&filter);
builder.drawArc(SkRect::MakeXYWH(410, 110, 100, 100), 45, 270, true);
}
// Mask blurred text.
{
auto filter = flutter::DlBlurMaskFilter(kSolid_SkBlurStyle, 10.0f);
builder.setMaskFilter(&filter);
builder.drawTextBlob(
SkTextBlob::MakeFromString("Testing", CreateTestFont()), 220, 170);
}
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, IgnoreMaskFilterWhenSavingLayer) {
auto texture = CreateTextureForFixture("embarcadero.jpg");
flutter::DisplayListBuilder builder;
auto filter = flutter::DlBlurMaskFilter(kNormal_SkBlurStyle, 10.0f);
flutter::DlPaint paint;
paint.setMaskFilter(&filter);
builder.SaveLayer(nullptr, &paint);
builder.DrawImage(DlImageImpeller::Make(texture), SkPoint::Make(100, 100),
flutter::DlImageSampling::kNearestNeighbor);
builder.Restore();
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawWithBlendColorFilter) {
auto texture = CreateTextureForFixture("embarcadero.jpg");
flutter::DisplayListBuilder builder;
// Pipeline blended image.
{
auto filter = flutter::DlBlendColorFilter(SK_ColorYELLOW,
flutter::DlBlendMode::kModulate);
builder.setColorFilter(&filter);
builder.drawImage(DlImageImpeller::Make(texture), SkPoint::Make(100, 100),
flutter::DlImageSampling::kNearestNeighbor, true);
}
// Advanced blended image.
{
auto filter =
flutter::DlBlendColorFilter(SK_ColorRED, flutter::DlBlendMode::kScreen);
builder.setColorFilter(&filter);
builder.drawImage(DlImageImpeller::Make(texture), SkPoint::Make(250, 250),
flutter::DlImageSampling::kNearestNeighbor, true);
}
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawWithColorFilterImageFilter) {
const float invert_color_matrix[20] = {
-1, 0, 0, 0, 1, //
0, -1, 0, 0, 1, //
0, 0, -1, 0, 1, //
0, 0, 0, 1, 0, //
};
auto texture = CreateTextureForFixture("boston.jpg");
flutter::DisplayListBuilder builder;
auto color_filter =
std::make_shared<flutter::DlMatrixColorFilter>(invert_color_matrix);
auto image_filter =
std::make_shared<flutter::DlColorFilterImageFilter>(color_filter);
builder.setImageFilter(image_filter.get());
builder.drawImage(DlImageImpeller::Make(texture), SkPoint::Make(100, 100),
flutter::DlImageSampling::kNearestNeighbor, true);
builder.translate(0, 700);
builder.setColorFilter(color_filter.get());
builder.drawImage(DlImageImpeller::Make(texture), SkPoint::Make(100, 100),
flutter::DlImageSampling::kNearestNeighbor, true);
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawWithImageBlurFilter) {
auto texture = CreateTextureForFixture("embarcadero.jpg");
auto callback = [&]() {
static float sigma[] = {10, 10};
ImGui::Begin("Controls", nullptr, ImGuiWindowFlags_AlwaysAutoResize);
ImGui::SliderFloat2("Sigma", sigma, 0, 100);
ImGui::End();
flutter::DisplayListBuilder builder;
auto filter = flutter::DlBlurImageFilter(sigma[0], sigma[1],
flutter::DlTileMode::kClamp);
builder.setImageFilter(&filter);
builder.drawImage(DlImageImpeller::Make(texture), SkPoint::Make(200, 200),
flutter::DlImageSampling::kNearestNeighbor, true);
return builder.Build();
};
ASSERT_TRUE(OpenPlaygroundHere(callback));
}
TEST_P(DisplayListTest, CanDrawWithComposeImageFilter) {
auto texture = CreateTextureForFixture("boston.jpg");
flutter::DisplayListBuilder builder;
auto dilate = std::make_shared<flutter::DlDilateImageFilter>(10.0, 10.0);
auto erode = std::make_shared<flutter::DlErodeImageFilter>(10.0, 10.0);
auto open = std::make_shared<flutter::DlComposeImageFilter>(dilate, erode);
auto close = std::make_shared<flutter::DlComposeImageFilter>(erode, dilate);
builder.setImageFilter(open.get());
builder.drawImage(DlImageImpeller::Make(texture), SkPoint::Make(100, 100),
flutter::DlImageSampling::kNearestNeighbor, true);
builder.translate(0, 700);
builder.setImageFilter(close.get());
builder.drawImage(DlImageImpeller::Make(texture), SkPoint::Make(100, 100),
flutter::DlImageSampling::kNearestNeighbor, true);
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanClampTheResultingColorOfColorMatrixFilter) {
auto texture = CreateTextureForFixture("boston.jpg");
const float inner_color_matrix[20] = {
1, 0, 0, 0, 0, //
0, 1, 0, 0, 0, //
0, 0, 1, 0, 0, //
0, 0, 0, 2, 0, //
};
const float outer_color_matrix[20] = {
1, 0, 0, 0, 0, //
0, 1, 0, 0, 0, //
0, 0, 1, 0, 0, //
0, 0, 0, 0.5, 0, //
};
auto inner_color_filter =
std::make_shared<flutter::DlMatrixColorFilter>(inner_color_matrix);
auto outer_color_filter =
std::make_shared<flutter::DlMatrixColorFilter>(outer_color_matrix);
auto inner =
std::make_shared<flutter::DlColorFilterImageFilter>(inner_color_filter);
auto outer =
std::make_shared<flutter::DlColorFilterImageFilter>(outer_color_filter);
auto compose = std::make_shared<flutter::DlComposeImageFilter>(outer, inner);
flutter::DisplayListBuilder builder;
builder.setImageFilter(compose.get());
builder.drawImage(DlImageImpeller::Make(texture), SkPoint::Make(100, 100),
flutter::DlImageSampling::kNearestNeighbor, true);
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, SaveLayerWithColorMatrixFiltersAndAlphaDrawCorrectly) {
auto texture = CreateTextureForFixture("boston.jpg");
enum class Type { kUseAsImageFilter, kUseAsColorFilter, kDisableFilter };
auto callback = [&]() {
static float alpha = 0.5;
static int selected_type = 0;
const char* names[] = {"Use as image filter", "Use as color filter",
"Disable filter"};
static float color_matrix[20] = {
1, 0, 0, 0, 0, //
0, 1, 0, 0, 0, //
0, 0, 1, 0, 0, //
0, 0, 0, 2, 0, //
};
ImGui::Begin("Controls", nullptr, ImGuiWindowFlags_AlwaysAutoResize);
ImGui::SliderFloat("Alpha", &alpha, 0, 1);
ImGui::Combo("Type", &selected_type, names, sizeof(names) / sizeof(char*));
std::string label = "##1";
for (int i = 0; i < 20; i += 5) {
ImGui::InputScalarN(label.c_str(), ImGuiDataType_Float,
&(color_matrix[i]), 5, nullptr, nullptr, "%.2f", 0);
label[2]++;
}
ImGui::End();
flutter::DisplayListBuilder builder;
flutter::DlPaint save_paint;
save_paint.setAlpha(static_cast<uint8_t>(255 * alpha));
auto color_filter =
std::make_shared<flutter::DlMatrixColorFilter>(color_matrix);
Type type = static_cast<Type>(selected_type);
switch (type) {
case Type::kUseAsImageFilter: {
auto image_filter =
std::make_shared<flutter::DlColorFilterImageFilter>(color_filter);
save_paint.setImageFilter(image_filter);
break;
}
case Type::kUseAsColorFilter: {
save_paint.setColorFilter(color_filter);
break;
}
case Type::kDisableFilter:
break;
}
builder.SaveLayer(nullptr, &save_paint);
flutter::DlPaint draw_paint;
builder.DrawImage(DlImageImpeller::Make(texture), SkPoint::Make(100, 100),
flutter::DlImageSampling::kNearestNeighbor, &draw_paint);
builder.Restore();
return builder.Build();
};
ASSERT_TRUE(OpenPlaygroundHere(callback));
}
TEST_P(DisplayListTest, SaveLayerWithBlendFiltersAndAlphaDrawCorrectly) {
auto texture = CreateTextureForFixture("boston.jpg");
enum class Type { kUseAsImageFilter, kUseAsColorFilter, kDisableFilter };
auto callback = [&]() {
static float alpha = 0.5;
static int selected_type = 0;
const char* names[] = {"Use as image filter", "Use as color filter",
"Disable filter"};
ImGui::Begin("Controls", nullptr, ImGuiWindowFlags_AlwaysAutoResize);
ImGui::SliderFloat("Alpha", &alpha, 0, 1);
ImGui::Combo("Type", &selected_type, names, sizeof(names) / sizeof(char*));
ImGui::End();
flutter::DisplayListBuilder builder;
flutter::DlPaint save_paint;
save_paint.setAlpha(static_cast<uint8_t>(255 * alpha));
auto color_filter = std::make_shared<flutter::DlBlendColorFilter>(
flutter::DlColor::kRed(), flutter::DlBlendMode::kDstOver);
Type type = static_cast<Type>(selected_type);
switch (type) {
case Type::kUseAsImageFilter: {
auto image_filter =
std::make_shared<flutter::DlColorFilterImageFilter>(color_filter);
save_paint.setImageFilter(image_filter);
break;
}
case Type::kUseAsColorFilter: {
save_paint.setColorFilter(color_filter);
break;
}
case Type::kDisableFilter:
break;
}
builder.SaveLayer(nullptr, &save_paint);
flutter::DlPaint draw_paint;
draw_paint.setColor(flutter::DlColor::kBlue());
builder.DrawRect(SkRect::MakeLTRB(100, 100, 400, 400), draw_paint);
builder.Restore();
return builder.Build();
};
ASSERT_TRUE(OpenPlaygroundHere(callback));
}
TEST_P(DisplayListTest, CanDrawBackdropFilter) {
auto texture = CreateTextureForFixture("embarcadero.jpg");
auto callback = [&]() {
static float sigma[] = {10, 10};
static float ctm_scale = 1;
static bool use_bounds = true;
static bool draw_circle = true;
static bool add_clip = true;
ImGui::Begin("Controls", nullptr, ImGuiWindowFlags_AlwaysAutoResize);
ImGui::SliderFloat2("Sigma", sigma, 0, 100);
ImGui::SliderFloat("Scale", &ctm_scale, 0, 10);
ImGui::NewLine();
ImGui::TextWrapped(
"If everything is working correctly, none of the options below should "
"impact the filter's appearance.");
ImGui::Checkbox("Use SaveLayer bounds", &use_bounds);
ImGui::Checkbox("Draw child element", &draw_circle);
ImGui::Checkbox("Add pre-clip", &add_clip);
ImGui::End();
flutter::DisplayListBuilder builder;
Vector2 scale = ctm_scale * GetContentScale();
builder.scale(scale.x, scale.y);
auto filter = flutter::DlBlurImageFilter(sigma[0], sigma[1],
flutter::DlTileMode::kClamp);
std::optional<SkRect> bounds;
if (use_bounds) {
auto [p1, p2] = IMPELLER_PLAYGROUND_LINE(
Point(350, 150), Point(800, 600), 20, Color::White(), Color::White());
bounds = SkRect::MakeLTRB(p1.x, p1.y, p2.x, p2.y);
}
// Insert a clip to test that the backdrop filter handles stencil depths > 0
// correctly.
if (add_clip) {
builder.clipRect(SkRect::MakeLTRB(0, 0, 99999, 99999),
flutter::DlCanvas::ClipOp::kIntersect, true);
}
builder.drawImage(DlImageImpeller::Make(texture), SkPoint::Make(200, 200),
flutter::DlImageSampling::kNearestNeighbor, true);
builder.SaveLayer(bounds.has_value() ? &bounds.value() : nullptr, nullptr,
&filter);
if (draw_circle) {
auto circle_center =
IMPELLER_PLAYGROUND_POINT(Point(500, 400), 20, Color::Red());
builder.setStyle(flutter::DlDrawStyle::kStroke);
builder.setStrokeCap(flutter::DlStrokeCap::kButt);
builder.setStrokeJoin(flutter::DlStrokeJoin::kBevel);
builder.setStrokeWidth(10);
builder.setColor(flutter::DlColor::kRed().withAlpha(100));
builder.drawCircle({circle_center.x, circle_center.y}, 100);
}
return builder.Build();
};
ASSERT_TRUE(OpenPlaygroundHere(callback));
}
TEST_P(DisplayListTest, CanDrawNinePatchImage) {
// Image is drawn with corners to scale and center pieces stretched to fit.
auto texture = CreateTextureForFixture("embarcadero.jpg");
flutter::DisplayListBuilder builder;
auto size = texture->GetSize();
builder.drawImageNine(
DlImageImpeller::Make(texture),
SkIRect::MakeLTRB(size.width / 4, size.height / 4, size.width * 3 / 4,
size.height * 3 / 4),
SkRect::MakeLTRB(0, 0, size.width * 2, size.height * 2),
flutter::DlFilterMode::kNearest, true);
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawNinePatchImageCenterWidthBiggerThanDest) {
// Edge case, the width of the corners does not leave any room for the
// center slice. The center (across the vertical axis) is folded out of the
// resulting image.
auto texture = CreateTextureForFixture("embarcadero.jpg");
flutter::DisplayListBuilder builder;
auto size = texture->GetSize();
builder.drawImageNine(
DlImageImpeller::Make(texture),
SkIRect::MakeLTRB(size.width / 4, size.height / 4, size.width * 3 / 4,
size.height * 3 / 4),
SkRect::MakeLTRB(0, 0, size.width / 2, size.height),
flutter::DlFilterMode::kNearest, true);
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawNinePatchImageCenterHeightBiggerThanDest) {
// Edge case, the height of the corners does not leave any room for the
// center slice. The center (across the horizontal axis) is folded out of the
// resulting image.
auto texture = CreateTextureForFixture("embarcadero.jpg");
flutter::DisplayListBuilder builder;
auto size = texture->GetSize();
builder.drawImageNine(
DlImageImpeller::Make(texture),
SkIRect::MakeLTRB(size.width / 4, size.height / 4, size.width * 3 / 4,
size.height * 3 / 4),
SkRect::MakeLTRB(0, 0, size.width, size.height / 2),
flutter::DlFilterMode::kNearest, true);
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawNinePatchImageCenterBiggerThanDest) {
// Edge case, the width and height of the corners does not leave any
// room for the center slices. Only the corners are displayed.
auto texture = CreateTextureForFixture("embarcadero.jpg");
flutter::DisplayListBuilder builder;
auto size = texture->GetSize();
builder.drawImageNine(
DlImageImpeller::Make(texture),
SkIRect::MakeLTRB(size.width / 4, size.height / 4, size.width * 3 / 4,
size.height * 3 / 4),
SkRect::MakeLTRB(0, 0, size.width / 2, size.height / 2),
flutter::DlFilterMode::kNearest, true);
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawNinePatchImageCornersScaledDown) {
// Edge case, there is not enough room for the corners to be drawn
// without scaling them down.
auto texture = CreateTextureForFixture("embarcadero.jpg");
flutter::DisplayListBuilder builder;
auto size = texture->GetSize();
builder.drawImageNine(
DlImageImpeller::Make(texture),
SkIRect::MakeLTRB(size.width / 4, size.height / 4, size.width * 3 / 4,
size.height * 3 / 4),
SkRect::MakeLTRB(0, 0, size.width / 4, size.height / 4),
flutter::DlFilterMode::kNearest, true);
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawPoints) {
flutter::DisplayListBuilder builder;
SkPoint points[7] = {
{0, 0}, //
{100, 100}, //
{100, 0}, //
{0, 100}, //
{0, 0}, //
{48, 48}, //
{52, 52}, //
};
std::vector<flutter::DlStrokeCap> caps = {
flutter::DlStrokeCap::kButt,
flutter::DlStrokeCap::kRound,
flutter::DlStrokeCap::kSquare,
};
flutter::DlPaint paint =
flutter::DlPaint() //
.setColor(flutter::DlColor::kYellow().withAlpha(127)) //
.setStrokeWidth(20);
builder.Translate(50, 50);
for (auto cap : caps) {
paint.setStrokeCap(cap);
builder.Save();
builder.DrawPoints(flutter::DlCanvas::PointMode::kPoints, 7, points, paint);
builder.Translate(150, 0);
builder.DrawPoints(flutter::DlCanvas::PointMode::kLines, 5, points, paint);
builder.Translate(150, 0);
builder.DrawPoints(flutter::DlCanvas::PointMode::kPolygon, 5, points,
paint);
builder.Restore();
builder.Translate(0, 150);
}
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawZeroLengthLine) {
flutter::DisplayListBuilder builder;
std::vector<flutter::DlStrokeCap> caps = {
flutter::DlStrokeCap::kButt,
flutter::DlStrokeCap::kRound,
flutter::DlStrokeCap::kSquare,
};
flutter::DlPaint paint =
flutter::DlPaint() //
.setColor(flutter::DlColor::kYellow().withAlpha(127)) //
.setDrawStyle(flutter::DlDrawStyle::kStroke) //
.setStrokeCap(flutter::DlStrokeCap::kButt) //
.setStrokeWidth(20);
SkPath path = SkPath().addPoly({{150, 50}, {150, 50}}, false);
for (auto cap : caps) {
paint.setStrokeCap(cap);
builder.DrawLine({50, 50}, {50, 50}, paint);
builder.DrawPath(path, paint);
builder.Translate(0, 150);
}
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawShadow) {
flutter::DisplayListBuilder builder;
auto content_scale = GetContentScale() * 0.8;
builder.scale(content_scale.x, content_scale.y);
constexpr size_t star_spikes = 5;
constexpr SkScalar half_spike_rotation = kPi / star_spikes;
constexpr SkScalar radius = 40;
constexpr SkScalar spike_size = 10;
constexpr SkScalar outer_radius = radius + spike_size;
constexpr SkScalar inner_radius = radius - spike_size;
std::array<SkPoint, star_spikes * 2> star;
for (size_t i = 0; i < star_spikes; i++) {
const SkScalar rotation = half_spike_rotation * i * 2;
star[i * 2] = SkPoint::Make(50 + std::sin(rotation) * outer_radius,
50 - std::cos(rotation) * outer_radius);
star[i * 2 + 1] = SkPoint::Make(
50 + std::sin(rotation + half_spike_rotation) * inner_radius,
50 - std::cos(rotation + half_spike_rotation) * inner_radius);
}
std::array<SkPath, 4> paths = {
SkPath{}.addRect(SkRect::MakeXYWH(0, 0, 200, 100)),
SkPath{}.addRRect(
SkRRect::MakeRectXY(SkRect::MakeXYWH(20, 0, 200, 100), 30, 30)),
SkPath{}.addCircle(100, 50, 50),
SkPath{}.addPoly(star.data(), star.size(), true),
};
builder.setColor(flutter::DlColor::kWhite());
builder.drawPaint();
builder.setColor(flutter::DlColor::kCyan());
builder.translate(100, 50);
for (size_t x = 0; x < paths.size(); x++) {
builder.save();
for (size_t y = 0; y < 6; y++) {
builder.drawShadow(paths[x], flutter::DlColor::kBlack(), 3 + y * 8, false,
1);
builder.drawPath(paths[x]);
builder.translate(0, 150);
}
builder.restore();
builder.translate(250, 0);
}
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
// Draw a hexagon using triangle fan
TEST_P(DisplayListTest, CanConvertTriangleFanToTriangles) {
constexpr Scalar hexagon_radius = 125;
auto hex_start = Point(200.0, -hexagon_radius + 200.0);
auto center_to_flat = 1.73 / 2 * hexagon_radius;
// clang-format off
std::vector<SkPoint> vertices = {
SkPoint::Make(hex_start.x, hex_start.y),
SkPoint::Make(hex_start.x + center_to_flat, hex_start.y + 0.5 * hexagon_radius),
SkPoint::Make(hex_start.x + center_to_flat, hex_start.y + 1.5 * hexagon_radius),
SkPoint::Make(hex_start.x + center_to_flat, hex_start.y + 1.5 * hexagon_radius),
SkPoint::Make(hex_start.x, hex_start.y + 2 * hexagon_radius),
SkPoint::Make(hex_start.x, hex_start.y + 2 * hexagon_radius),
SkPoint::Make(hex_start.x - center_to_flat, hex_start.y + 1.5 * hexagon_radius),
SkPoint::Make(hex_start.x - center_to_flat, hex_start.y + 1.5 * hexagon_radius),
SkPoint::Make(hex_start.x - center_to_flat, hex_start.y + 0.5 * hexagon_radius)
};
// clang-format on
auto paint = flutter::DlPaint(flutter::DlColor::kDarkGrey());
auto dl_vertices = flutter::DlVertices::Make(
flutter::DlVertexMode::kTriangleFan, vertices.size(), vertices.data(),
nullptr, nullptr);
flutter::DisplayListBuilder builder;
builder.DrawVertices(dl_vertices, flutter::DlBlendMode::kSrcOver, paint);
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawZeroWidthLine) {
flutter::DisplayListBuilder builder;
std::vector<flutter::DlStrokeCap> caps = {
flutter::DlStrokeCap::kButt,
flutter::DlStrokeCap::kRound,
flutter::DlStrokeCap::kSquare,
};
flutter::DlPaint paint = //
flutter::DlPaint() //
.setColor(flutter::DlColor::kWhite()) //
.setDrawStyle(flutter::DlDrawStyle::kStroke) //
.setStrokeWidth(0);
flutter::DlPaint outline_paint = //
flutter::DlPaint() //
.setColor(flutter::DlColor::kYellow()) //
.setDrawStyle(flutter::DlDrawStyle::kStroke) //
.setStrokeCap(flutter::DlStrokeCap::kSquare) //
.setStrokeWidth(1);
SkPath path = SkPath().addPoly({{150, 50}, {160, 50}}, false);
for (auto cap : caps) {
paint.setStrokeCap(cap);
builder.DrawLine({50, 50}, {60, 50}, paint);
builder.DrawRect({45, 45, 65, 55}, outline_paint);
builder.DrawLine({100, 50}, {100, 50}, paint);
if (cap != flutter::DlStrokeCap::kButt) {
builder.DrawRect({95, 45, 105, 55}, outline_paint);
}
builder.DrawPath(path, paint);
builder.DrawRect(path.getBounds().makeOutset(5, 5), outline_paint);
builder.Translate(0, 150);
}
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawWithMatrixFilter) {
auto boston = CreateTextureForFixture("boston.jpg");
auto callback = [&]() {
static int selected_matrix_type = 0;
const char* matrix_type_names[] = {"Matrix", "Local Matrix"};
static float ctm_translation[2] = {200, 200};
static float ctm_scale[2] = {0.65, 0.65};
static float ctm_skew[2] = {0, 0};
static bool enable = true;
static float translation[2] = {100, 100};
static float scale[2] = {0.8, 0.8};
static float skew[2] = {0.2, 0.2};
static bool enable_savelayer = true;
ImGui::Begin("Controls", nullptr, ImGuiWindowFlags_AlwaysAutoResize);
{
ImGui::Combo("Filter type", &selected_matrix_type, matrix_type_names,
sizeof(matrix_type_names) / sizeof(char*));
ImGui::TextWrapped("Current Transform");
ImGui::SliderFloat2("CTM Translation", ctm_translation, 0, 1000);
ImGui::SliderFloat2("CTM Scale", ctm_scale, 0, 3);
ImGui::SliderFloat2("CTM Skew", ctm_skew, -3, 3);
ImGui::TextWrapped(
"MatrixFilter and LocalMatrixFilter modify the CTM in the same way. "
"The only difference is that MatrixFilter doesn't affect the effect "
"transform, whereas LocalMatrixFilter does.");
// Note: See this behavior in:
// https://fiddle.skia.org/c/6cbb551ab36d06f163db8693972be954
ImGui::Checkbox("Enable", &enable);
ImGui::SliderFloat2("Filter Translation", translation, 0, 1000);
ImGui::SliderFloat2("Filter Scale", scale, 0, 3);
ImGui::SliderFloat2("Filter Skew", skew, -3, 3);
ImGui::TextWrapped(
"Rendering the filtered image within a layer can expose bounds "
"issues. If the rendered image gets cut off when this setting is "
"enabled, there's a coverage bug in the filter.");
ImGui::Checkbox("Render in layer", &enable_savelayer);
}
ImGui::End();
flutter::DisplayListBuilder builder;
SkPaint paint;
if (enable_savelayer) {
builder.SaveLayer(nullptr, nullptr);
}
{
auto content_scale = GetContentScale();
builder.scale(content_scale.x, content_scale.y);
// Set the current transform
auto ctm_matrix =
SkMatrix::MakeAll(ctm_scale[0], ctm_skew[0], ctm_translation[0], //
ctm_skew[1], ctm_scale[1], ctm_translation[1], //
0, 0, 1);
builder.transform(ctm_matrix);
// Set the matrix filter
auto filter_matrix =
SkMatrix::MakeAll(scale[0], skew[0], translation[0], //
skew[1], scale[1], translation[1], //
0, 0, 1);
if (enable) {
switch (selected_matrix_type) {
case 0: {
auto filter = flutter::DlMatrixImageFilter(
filter_matrix, flutter::DlImageSampling::kLinear);
builder.setImageFilter(&filter);
break;
}
case 1: {
auto internal_filter =
flutter::DlBlurImageFilter(10, 10, flutter::DlTileMode::kDecal)
.shared();
auto filter = flutter::DlLocalMatrixImageFilter(filter_matrix,
internal_filter);
builder.setImageFilter(&filter);
break;
}
}
}
builder.drawImage(DlImageImpeller::Make(boston), {},
flutter::DlImageSampling::kLinear, true);
}
if (enable_savelayer) {
builder.restore();
}
return builder.Build();
};
ASSERT_TRUE(OpenPlaygroundHere(callback));
}
TEST_P(DisplayListTest, CanDrawRectWithLinearToSrgbColorFilter) {
flutter::DlPaint paint;
paint.setColor(flutter::DlColor(0xFF2196F3).withAlpha(128));
flutter::DisplayListBuilder builder;
paint.setColorFilter(flutter::DlLinearToSrgbGammaColorFilter::instance.get());
builder.DrawRect(SkRect::MakeXYWH(0, 0, 200, 200), paint);
builder.Translate(0, 200);
paint.setColorFilter(flutter::DlSrgbToLinearGammaColorFilter::instance.get());
builder.DrawRect(SkRect::MakeXYWH(0, 0, 200, 200), paint);
ASSERT_TRUE(OpenPlaygroundHere(builder.Build()));
}
TEST_P(DisplayListTest, CanDrawPaintWithColorSource) {
const flutter::DlColor colors[2] = {
flutter::DlColor(0xFFF44336),
flutter::DlColor(0xFF2196F3),
};
const float stops[2] = {0.0, 1.0};
flutter::DlPaint paint;
flutter::DisplayListBuilder builder;
auto clip_bounds = SkRect::MakeWH(300.0, 300.0);
builder.Save();
builder.Translate(100, 100);
builder.ClipRect(clip_bounds, flutter::DlCanvas::ClipOp::kIntersect, false);
auto linear =
flutter::DlColorSource::MakeLinear({0.0, 0.0}, {100.0, 100.0}, 2, colors,
stops, flutter::DlTileMode::kRepeat);
paint.setColorSource(linear);
builder.DrawPaint(paint);
builder.Restore();
builder.Save();
builder.Translate(500, 100);
builder.ClipRect(clip_bounds, flutter::DlCanvas::ClipOp::kIntersect, false);
auto radial = flutter::DlColorSource::MakeRadial(
{100.0, 100.0}, 100.0, 2, colors, stops, flutter::DlTileMode::kRepeat);
paint.setColorSource(radial);
builder.DrawPaint(paint);
builder.Restore();
builder.Save();
builder.Translate(100, 500);
builder.ClipRect(clip_bounds, flutter::DlCanvas::ClipOp::kIntersect, false);
auto sweep =
flutter::DlColorSource::MakeSweep({100.0, 100.0}, 180.0, 270.0, 2, colors,