66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// Licensed under the MIT License.
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#ifndef VIEWERUTIL_H
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#define VIEWERUTIL_H
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#include <sstream>
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#include "k4aimgui_all.h"
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namespace viewer
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{
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// Throw an error if OpenGL has encountered an error.
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//
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inline void CheckOpenGLErrors()
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{
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const GLenum glStatus = glGetError();
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if (glStatus != GL_NO_ERROR)
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{
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std::stringstream errorBuilder;
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errorBuilder << "OpenGL error: " << static_cast<int>(glStatus);
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throw std::runtime_error(errorBuilder.str().c_str());
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}
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}
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// Gets the height of the title bar, in pixels
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//
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inline float GetTitleBarHeight()
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{
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return ImGui::GetFont()->FontSize + ImGui::GetStyle().FramePadding.y * 2;
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}
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// Gets the maximum dimensions that an image of size imageDimensions can be scaled to in order
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// to fit in a window with imageMaxSize available space while maintaining its aspect ratio.
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// imageMaxSize is expected to include space for window padding, but does not account for the
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// title bar or any any potential other widgets in your window, so you'll need to subtract those
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// from imageMaxSize, if applicable.
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//
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inline ImVec2 GetMaxImageSize(const ImVec2 imageDimensions, const ImVec2 imageMaxSize)
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{
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const float sourceAspectRatio = imageDimensions.x / imageDimensions.y;
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const float verticalPadding = ImGui::GetStyle().WindowPadding.y * 2;
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const float horizontalPadding = ImGui::GetStyle().WindowPadding.x * 2;
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const float horizontalMaxSize = imageMaxSize.x - horizontalPadding;
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const float verticalMaxSize = imageMaxSize.y - verticalPadding;
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ImVec2 displayDimensions;
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if (horizontalMaxSize / sourceAspectRatio <= verticalMaxSize)
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{
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displayDimensions.x = horizontalMaxSize;
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displayDimensions.y = horizontalMaxSize / sourceAspectRatio;
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}
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else
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{
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displayDimensions.x = verticalMaxSize * sourceAspectRatio;
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displayDimensions.y = verticalMaxSize;
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}
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return displayDimensions;
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}
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} // namespace viewer
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#endif
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