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// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <cmath>
#include "common/assert.h"
#include "common/settings.h"
#include "common/settings_enums.h"
#include "core/frontend/framebuffer_layout.h"
namespace Layout {
// Finds the largest size subrectangle contained in window area that is confined to the aspect ratio
static Common::Rectangle<u32> MaxRectangle(Common::Rectangle<u32> window_area, float screen_aspect_ratio) noexcept {
const float scale = (std::min)(float(window_area.GetWidth()), float(window_area.GetHeight()) / screen_aspect_ratio);
return Common::Rectangle<u32>{0, 0, u32(std::round(scale)), u32(std::round(scale * screen_aspect_ratio))};
}
/// @brief Factory method for constructing a default FramebufferLayout
/// @param width Window framebuffer width in pixels
/// @param height Window framebuffer height in pixels
/// @return Newly created FramebufferLayout object with default screen regions initialized
FramebufferLayout DefaultFrameLayout(u32 width, u32 height) noexcept {
ASSERT(width > 0 && height > 0);
auto const window_aspect_ratio = float(height) / float(width);
auto const emulation_aspect_ratio = EmulationAspectRatio(Settings::values.aspect_ratio.GetValue(), window_aspect_ratio);
Common::Rectangle<u32> const screen_window_area{0, 0, width, height};
auto screen = MaxRectangle(screen_window_area, emulation_aspect_ratio);
if (window_aspect_ratio < emulation_aspect_ratio) {
screen = screen.TranslateX((screen_window_area.GetWidth() - screen.GetWidth()) / 2);
} else {
screen = screen.TranslateY((height - screen.GetHeight()) / 2);
}
// The drawing code needs at least somewhat valid values for both screens
// so just calculate them both even if the other isn't showing.
return FramebufferLayout{
.width = width,
.height = height,
.screen = screen,
.is_srgb = false,
};
}
/// @brief Convenience method to determine emulation aspect ratio
/// @param aspect Represents the index of aspect ratio stored in Settings::values.aspect_ratio
/// @param window_aspect_ratio Current window aspect ratio
/// @return Emulation render window aspect ratio
float EmulationAspectRatio(Settings::AspectRatio aspect, float window_aspect_ratio) noexcept {
switch (aspect) {
case Settings::AspectRatio::R16_9:
return 9.0f / 16.0f;
case Settings::AspectRatio::R4_3:
return 3.0f / 4.0f;
case Settings::AspectRatio::R21_9:
return 9.0f / 21.0f;
case Settings::AspectRatio::R16_10:
return 10.0f / 16.0f;
case Settings::AspectRatio::Stretch:
return window_aspect_ratio;
default:
return float(ScreenUndocked::Height) / ScreenUndocked::Width;
}
}
} // namespace Layout
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