mirror of
https://github.com/Blinue/Magpie.git
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113 lines
3.4 KiB
C++
113 lines
3.4 KiB
C++
#include "pch.h"
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#include "FrameSourceBase.h"
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#include "Utils.h"
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#include "App.h"
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extern std::shared_ptr<spdlog::logger> logger;
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bool FrameSourceBase::_GetMapToOriginDPI(HWND hWnd, double& a, double& bx, double& by) {
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// HDC 中的 HBITMAP 尺寸为窗口的原始尺寸
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// 通过 GetWindowRect 获得的尺寸为窗口的 DPI 缩放后尺寸
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// 它们的商即为窗口的 DPI 缩放
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HDC hdcWindow = GetDCEx(hWnd, NULL, DCX_LOCKWINDOWUPDATE | DCX_WINDOW);
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if (!hdcWindow) {
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SPDLOG_LOGGER_ERROR(logger, MakeWin32ErrorMsg("GetDCEx 失败"));
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return false;
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}
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HDC hdcClient = GetDCEx(hWnd, NULL, DCX_LOCKWINDOWUPDATE);
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if (!hdcClient) {
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SPDLOG_LOGGER_ERROR(logger, MakeWin32ErrorMsg("GetDCEx 失败"));
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ReleaseDC(hWnd, hdcWindow);
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return false;
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}
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Utils::ScopeExit se([hWnd, hdcWindow, hdcClient]() {
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ReleaseDC(hWnd, hdcWindow);
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ReleaseDC(hWnd, hdcClient);
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});
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HBITMAP hBmpWindow = (HBITMAP)GetCurrentObject(hdcWindow, OBJ_BITMAP);
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if (!hBmpWindow) {
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SPDLOG_LOGGER_ERROR(logger, MakeWin32ErrorMsg("GetCurrentObject 失败"));
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return false;
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}
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BITMAP bmp{};
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if (!GetObject(hBmpWindow, sizeof(bmp), &bmp)) {
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SPDLOG_LOGGER_ERROR(logger, MakeWin32ErrorMsg("GetObject 失败"));
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return false;
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}
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RECT rect;
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if (!GetWindowRect(hWnd, &rect)) {
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SPDLOG_LOGGER_ERROR(logger, MakeWin32ErrorMsg("GetWindowRect 失败"));
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return false;
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}
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a = bmp.bmWidth / double(rect.right - rect.left);
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// 使用 DPI 缩放无法可靠计算出窗口客户区的位置
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// 这里使用窗口 HDC 和客户区 HDC 的原点坐标差值
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// GetDCOrgEx 获得的是 DC 原点的屏幕坐标
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POINT ptClient{}, ptWindow{};
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if (!GetDCOrgEx(hdcClient, &ptClient)) {
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SPDLOG_LOGGER_ERROR(logger, MakeWin32ErrorMsg("GetDCOrgEx 失败"));
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return false;
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}
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if (!GetDCOrgEx(hdcWindow, &ptWindow)) {
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SPDLOG_LOGGER_ERROR(logger, MakeWin32ErrorMsg("GetDCOrgEx 失败"));
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return false;
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}
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if (!Utils::GetClientScreenRect(hWnd, rect)) {
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SPDLOG_LOGGER_ERROR(logger, "GetClientScreenRect 失败");
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return false;
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}
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// 以窗口的客户区左上角为基准
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// 该点在坐标系 1 中坐标为 (rect.left, rect.top)
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// 在坐标系 2 中坐标为 (ptClient.x - ptWindow.x, ptClient.y - ptWindow.y)
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// 由此计算出 b
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bx = ptClient.x - ptWindow.x - rect.left * a;
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by = ptClient.y - ptWindow.y - rect.top * a;
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return true;
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}
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bool FrameSourceBase::_CenterWindowIfNecessary(HWND hWnd, const RECT& rcWork) {
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RECT srcRect;
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if (!GetWindowRect(hWnd, &srcRect)) {
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SPDLOG_LOGGER_ERROR(logger, MakeWin32ErrorMsg("GetWindowRect 失败"));
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return false;
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}
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if (srcRect.left < rcWork.left || srcRect.top < rcWork.top
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|| srcRect.right > rcWork.right || srcRect.bottom > rcWork.bottom) {
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// 源窗口超越边界，将源窗口移到屏幕中央
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SIZE srcSize = { srcRect.right - srcRect.left, srcRect.bottom - srcRect.top };
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SIZE rcWorkSize = { rcWork.right - rcWork.left, rcWork.bottom - rcWork.top };
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if (srcSize.cx > rcWorkSize.cx || srcSize.cy > rcWorkSize.cy) {
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// 源窗口无法被当前屏幕容纳，因此无法捕获
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App::GetInstance().SetErrorMsg(ErrorMessages::SRC_TOO_LARGE);
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return false;
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}
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if (!SetWindowPos(
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hWnd,
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0,
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rcWork.left + (rcWorkSize.cx - srcSize.cx) / 2,
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rcWork.top + (rcWorkSize.cy - srcSize.cy) / 2,
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0,
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0,
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SWP_NOSIZE | SWP_NOZORDER
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)) {
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SPDLOG_LOGGER_ERROR(logger, MakeWin32ErrorMsg("SetWindowPos 失败"));
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}
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}
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return true;
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}
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