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LibGfx+Everywhere: Change Gfx::Rect to be endpoint exclusive

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Previously, calling `.right()` on a `Gfx::Rect` would return the last
column's coordinate still inside the rectangle, or `left + width - 1`.
This is called 'endpoint inclusive' and does not make a lot of sense for
`Gfx::Rect<float>` where a rectangle of width 5 at position (0, 0) would
return 4 as its right side. This same problem exists for `.bottom()`.

This changes `Gfx::Rect` to be endpoint exclusive, which gives us the
nice property that `width = right - left` and `height = bottom - top`.
It enables us to treat `Gfx::Rect<int>` and `Gfx::Rect<float>` exactly
the same.

All users of `Gfx::Rect` have been updated accordingly.
This commit is contained in:
Jelle Raaijmakers 2023-05-22 00:41:18 +02:00 • committed by Andreas Kling
parent b7f4363791
commit f391ccfe53
88 changed files with 524 additions and 518 deletions
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1
Tests/LibGfx/CMakeLists.txt
View file

@ -5,6 +5,7 @@ set(TEST_SOURCES
TestFontHandling.cpp
TestICCProfile.cpp
TestImageDecoder.cpp
TestRect.cpp
TestScalingFunctions.cpp
)

47
Tests/LibGfx/TestRect.cpp Normal file
View file

@ -0,0 +1,47 @@
/*
* Copyright (c) 2023, Jelle Raaijmakers <jelle@gmta.nl>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGfx/Rect.h>
#include <LibTest/TestCase.h>
TEST_CASE(int_rect_right_and_bottom)
{
Gfx::IntRect rect = { 2, 3, 4, 5 };
EXPECT_EQ(rect.right(), 6);
EXPECT_EQ(rect.bottom(), 8);
}
TEST_CASE(float_rect_right_and_bottom)
{
Gfx::FloatRect rect = { 1.f, 2.f, 3.5f, 4.5f };
EXPECT_APPROXIMATE(rect.right(), 4.5f);
EXPECT_APPROXIMATE(rect.bottom(), 6.5f);
}
TEST_CASE(rect_contains_vertically)
{
Gfx::FloatRect rect = { 0.f, 0.f, 100.f, 100.f };
EXPECT(rect.contains_vertically(99.f));
EXPECT(!rect.contains_vertically(100.f));
}
TEST_CASE(rect_shatter)
{
Gfx::IntRect glass_plate = { 0, 0, 100, 100 };
Gfx::IntRect hammer = { 30, 40, 40, 10 };
auto shards = glass_plate.shatter(hammer);
EXPECT(!shards.is_empty());
int total_shard_area = 0;
for (auto shard : shards) {
EXPECT(glass_plate.contains(shard));
EXPECT(!hammer.intersects(shard));
total_shard_area += shard.size().area();
}
EXPECT_EQ(glass_plate.size().area() - hammer.size().area(), total_shard_area);
}

4
Tests/LibGfx/TestScalingFunctions.cpp
View file

@ -33,7 +33,7 @@ TEST_CASE(test_painter_scaling_uses_premultiplied_alpha)
EXPECT(center_pixel.alpha() < 255);
EXPECT_EQ(center_pixel.with_alpha(0), Color(Color::White).with_alpha(0));
auto bottom_right_pixel = scaled_bitmap->get_pixel(scaled_bitmap->rect().bottom_right());
auto bottom_right_pixel = scaled_bitmap->get_pixel(scaled_bitmap->rect().bottom_right().translated(-1));
EXPECT_EQ(bottom_right_pixel, Color::Transparent);
};
@ -61,6 +61,6 @@ TEST_CASE(test_bitmap_scaling_uses_premultiplied_alpha)
EXPECT(center_pixel.alpha() < 255);
EXPECT_EQ(center_pixel.with_alpha(0), Color(Color::White).with_alpha(0));
auto bottom_right_pixel = scaled_bitmap->get_pixel(scaled_bitmap->rect().bottom_right());
auto bottom_right_pixel = scaled_bitmap->get_pixel(scaled_bitmap->rect().bottom_right().translated(-1));
EXPECT_EQ(bottom_right_pixel, Color::Transparent);
}