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Code Issues 121 Wiki Activity

Fix loading screen background aspect ratio on ultrawide displays

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This commit is contained in:
Daniel Tian
2023-05-01 02:13:36 -10:00
committed by Milek7
parent d710f42f0c
commit 99330e3921
1 changed files with 17 additions and 8 deletions
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25
uilayer.cpp
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@@ -515,15 +515,24 @@ void ui_layer::render_background()
if (m_background == 0)
return;
ImVec2 size = ImGui::GetIO().DisplaySize;
ImVec2 display_size = ImGui::GetIO().DisplaySize;
ImVec2 image_size;
ImVec2 start_position;
ImVec2 end_position;
opengl_texture &tex = GfxRenderer->Texture(m_background);
tex.create();
ImGui::SetNextWindowPos(ImVec2(0, 0));
ImGui::SetNextWindowSize(size);
ImGui::Begin("Logo", nullptr,
ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoScrollWithMouse |
ImGuiWindowFlags_NoBringToFrontOnFocus);
ImGui::Image(reinterpret_cast<void *>(tex.id), size, ImVec2(0, 1), ImVec2(1, 0));
ImGui::End();
// Get the scaling factor based on the image aspect ratio vs. the display aspect ratio.
float scale_factor = (tex.width() / tex.height()) > (display_size.x / display_size.y)
? display_size.y / tex.height()
: display_size.x / tex.width();
// Resize the image to fill the display. This will zoom in on the image on ultrawide monitors.
image_size = ImVec2((int)(tex.width() * scale_factor), (int)(tex.height() * scale_factor));
// Center the image on the display.
start_position = ImVec2((display_size.x - image_size.x) / 2, (display_size.y - image_size.y) / 2);
end_position = ImVec2(image_size.x + start_position.x, image_size.y + start_position.y);
// The image is flipped upside-down, we'll use the UV parameters to draw it from bottom up to un-flip it.
ImGui::GetBackgroundDrawList()->AddImage((ImTextureID)tex.id, start_position, end_position, ImVec2(0, 1), ImVec2(1, 0));
}