git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1172 f5eea248-9336-0410-98b8-ebc06183d4e3remotes/trunk
Don Ho
11 years ago
parent
35c160ddff
commit
7edbd55348
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// This file is part of Notepad++ project
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// Copyright (C)2003 Don HO <don.h@free.fr>
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// Note that the GPL places important restrictions on "derived works", yet
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// it does not provide a detailed definition of that term. To avoid
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// misunderstandings, we consider an application to constitute a
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// "derivative work" for the purpose of this license if it does any of the
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// following:
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// 1. Integrates source code from Notepad++.
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// 2. Integrates/includes/aggregates Notepad++ into a proprietary executable
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// installer, such as those produced by InstallShield.
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// 3. Links to a library or executes a program that does any of the above.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#ifndef DPIMANAGER_H
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#define DPIMANAGER_H
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class DPIManager
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{
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public:
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DPIManager() {
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init();
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};
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// Get screen DPI.
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int getDPIX() { return _dpiX; };
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int getDPIY() { return _dpiY; };
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// Convert between raw pixels and relative pixels.
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int scaleX(int x) { return MulDiv(x, _dpiX, 96); };
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int scaleY(int y) { return MulDiv(y, _dpiY, 96); };
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int unscaleX(int x) { return MulDiv(x, 96, _dpiX); };
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int unscaleY(int y) { return MulDiv(y, 96, _dpiY); };
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// Determine the screen dimensions in relative pixels.
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int scaledScreenWidth() { return scaledSystemMetricX(SM_CXSCREEN); }
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int scaledScreenHeight() { return scaledSystemMetricY(SM_CYSCREEN); }
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// Scale rectangle from raw pixels to relative pixels.
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void scaleRect(__inout RECT *pRect) {
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pRect->left = scaleX(pRect->left);
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pRect->right = scaleX(pRect->right);
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pRect->top = scaleY(pRect->top);
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pRect->bottom = scaleY(pRect->bottom);
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}
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// Scale Point from raw pixels to relative pixels.
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void scalePoint(__inout POINT *pPoint)
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{
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pPoint->x = scaleX(pPoint->x);
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pPoint->y = scaleY(pPoint->y);
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}
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// Scale Size from raw pixels to relative pixels.
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void scaleSize(__inout SIZE *pSize)
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{
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pSize->cx = scaleX(pSize->cx);
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pSize->cy = scaleY(pSize->cy);
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}
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// Determine if screen resolution meets minimum requirements in relative pixels.
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bool isResolutionAtLeast(int cxMin, int cyMin)
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{
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return (scaledScreenWidth() >= cxMin) && (scaledScreenHeight() >= cyMin);
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}
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// Convert a point size (1/72 of an inch) to raw pixels.
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int pointsToPixels(int pt) { return MulDiv(pt, _dpiY, 72); };
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// Invalidate any cached metrics.
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void Invalidate() { init(); };
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private:
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// X and Y DPI values are provided, though to date all
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// Windows OS releases have equal X and Y scale values
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int _dpiX;
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int _dpiY;
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void init() {
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HDC hdc = GetDC(NULL);
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if (hdc)
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{
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// Initialize the DPIManager member variable
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// This will correspond to the DPI setting
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// With all Windows OS's to date the X and Y DPI will be identical
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_dpiX = GetDeviceCaps(hdc, LOGPIXELSX);
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_dpiY = GetDeviceCaps(hdc, LOGPIXELSY);
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ReleaseDC(NULL, hdc);
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}
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};
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// This returns a 96-DPI scaled-down equivalent value for nIndex
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// For example, the value 120 at 120 DPI setting gets scaled down to 96
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// X and Y versions are provided, though to date all Windows OS releases
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// have equal X and Y scale values
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int scaledSystemMetricX(int nIndex) {
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return MulDiv(GetSystemMetrics(nIndex), 96, _dpiX);
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};
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// This returns a 96-DPI scaled-down equivalent value for nIndex
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// For example, the value 120 at 120 DPI setting gets scaled down to 96
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// X and Y versions are provided, though to date all Windows OS releases
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// have equal X and Y scale values
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int scaledSystemMetricY(int nIndex)
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{
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return MulDiv(GetSystemMetrics(nIndex), 96, _dpiY);
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}
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};
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#endif //DPIMANAGER_H
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