InputCommon: Introducing the "Dynamic Input Texture". Configuration links an emulated input action to an image based on what host key is defined for that emulated input. Specific regions are called out in configuration that mark where to replace an input button with a host key image.

Source/Core/InputCommon/DynamicInputTextureConfiguration.h

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+// Copyright 2019 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include "Common/CommonTypes.h"
+#include "Common/IniFile.h"
+#include "InputCommon/ImageOperations.h"
+
+namespace InputCommon
+{
+class DynamicInputTextureConfiguration
+{
+public:
+  explicit DynamicInputTextureConfiguration(const std::string& json_file);
+  ~DynamicInputTextureConfiguration();
+  void GenerateTextures(const IniFile::Section* sec, const std::string& controller_name) const;
+
+private:
+  struct DynamicInputTextureData
+  {
+    std::string m_image_name;
+    std::string m_hires_texture_name;
+    std::string m_generated_folder_name;
+
+    using EmulatedKeyToRegionsMap = std::unordered_map<std::string, std::vector<Rect>>;
+    std::unordered_map<std::string, EmulatedKeyToRegionsMap> m_emulated_controllers;
+
+    using HostKeyToImagePath = std::unordered_map<std::string, std::string>;
+    std::unordered_map<std::string, HostKeyToImagePath> m_host_devices;
+    bool m_preserve_aspect_ratio = true;
+  };
+
+  bool GenerateTexture(const IniFile::Section* sec, const std::string& controller_name,
+                       const DynamicInputTextureData& texture_data) const;
+
+  std::vector<DynamicInputTextureData> m_dynamic_input_textures;
+  std::string m_base_path;
+  bool m_valid = true;
+};
+}  // namespace InputCommon