Added Fixed Zoom Levels

src/JPEGView/Config/JPEGView.ini

@@ -173,6 +173,11 @@ BlendFactorNavPanel=0.5
 ; Scaling factor for the navigation panel. Increase if the buttons on the panel are too small, e.g. on a touchscreen.
 ScaleFactorNavPanel=1.0
 
+; Enables/Disables the 'Zoom Steps' feature.
+UseZoomSteps=false
+
+; User defined percentages for the 'Zoom Steps' feature.
+CustomZoomSteps=3, 5, 10, 14, 16, 20, 25, 33, 50, 75, 100, 125, 150, 175, 200, 250, 300, 400, 600, 800, 1000, 1200, 1600, 2400, 3200, 6400
 
 
 ; *****************************************************************************

src/JPEGView/MainDlg.cpp

@@ -2603,8 +2603,25 @@ bool CMainDlg::PerformZoom(double dValue, bool bExponent, bool bZoomToMouse, boo
 	double dOldZoom = m_dZoom;
 	m_bUserZoom = true;
 	m_isUserFitToScreen = false;
+
 	if (bExponent) {
 		m_dZoom = m_dZoom * pow(m_dZoomMult, dValue);
+
+		bool useZoomSteps = CSettingsProvider::This().UseZoomSteps();
+
+		if (useZoomSteps) {
+			std::vector<double> zoomLevels = CSettingsProvider::This().CustomZoomSteps();
+
+			if (dOldZoom > zoomLevels[0] && dOldZoom < zoomLevels.back()) {
+				if (dValue > 0) {
+					m_dZoom = zoomLevels[distance(zoomLevels.begin(), std::lower_bound(zoomLevels.begin(), zoomLevels.end(), dOldZoom + 0.01))];
+				}
+				else {
+					m_dZoom = zoomLevels[distance(zoomLevels.begin(), std::lower_bound(zoomLevels.begin(), zoomLevels.end(), dOldZoom)) - 1];
+				}
+			}
+		}
+
 	} else {
 		m_dZoom = dValue;
 	}

src/JPEGView/SettingsProvider.cpp

@@ -3,7 +3,7 @@
 #include "NLS.h"
 #include <float.h>
 #include <shlobj.h>
-#include <algorithm>
+#include <sstream>
 
 static const TCHAR* DEFAULT_INI_FILE_NAME = _T("JPEGView.ini");
 static const TCHAR* SECTION_NAME = _T("JPEGView");
@@ -120,7 +120,6 @@ CSettingsProvider::CSettingsProvider(void) {
 	m_bShowZoomNavigator = GetBool(_T("ShowZoomNavigator"), true);
 	m_fBlendFactorNavPanel = (float)GetDouble(_T("BlendFactorNavPanel"), 0.5, 0.0, 1.0);
 	m_fScaleFactorNavPanel = (float)GetDouble(_T("ScaleFactorNavPanel"), 1.0, 0.8, 2.5);
-
 	CString sCPU = GetString(_T("CPUType"), _T("AutoDetect"));
 	if (sCPU.CompareNoCase(_T("Generic")) == 0) {
 		m_eCPUAlgorithm = Helpers::CPU_Generic;
@@ -218,6 +217,8 @@ CSettingsProvider::CSettingsProvider(void) {
 		m_bExplicitWindowRect = true;
 	}
 
+	m_bUseZoomSteps = GetBool(_T("UseZoomSteps"), false);
+	m_sCustomZoomSteps = ParseCustomZoomSteps(GetString(_T("CustomZoomSteps"), _T("3, 5, 10, 14, 16, 20, 25, 33, 50, 75, 100, 125, 150, 175, 200, 250, 300, 400, 600, 800, 1000, 1200, 1600, 2400, 3200, 6400")));
 	m_colorBackground = GetColor(_T("BackgroundColor"), 0);
 	m_colorGUI = GetColor(_T("GUIColor"), RGB(243, 242, 231));
 	m_colorHighlight = GetColor(_T("HighlightColor"), RGB(255, 205, 0));
@@ -405,7 +406,7 @@ void CSettingsProvider::ReadWriteableINISettings() {
 	m_dBrightenShadows = GetDouble(_T("LDCBrightenShadows"), 0.5, 0.0, 1.0);
 	m_dDarkenHighlights = GetDouble(_T("LDCDarkenHighlights"), 0.25, 0.0, 1.0);
 	m_dBrightenShadowsSteepness = GetDouble(_T("LDCBrightenShadowsSteepness"), 0.5, 0.0, 1.0);
-	CString sNavigation = GetString(_T("FolderNavigation"), _T("LoopFolder"));
+    CString sNavigation = GetString(_T("FolderNavigation"), _T("LoopFolder"));
 	if (sNavigation.CompareNoCase(_T("LoopSameFolderLevel")) == 0) {
 		m_eNavigation = Helpers::NM_LoopSameDirectoryLevel;
 	}
@@ -501,7 +502,6 @@ void CSettingsProvider::SaveSettings(const CImageProcessingParams& procParams,
 	WriteBool(_T("ShowFileInfo"), bShowFileInfo);
 
 	WriteString(_T("SlideShowTransitionEffect"), Helpers::ConvertTransitionEffectToString(eSlideShowTransitionEffect));
-
 	m_bUserINIExists = true;
 	ReadWriteableINISettings();
 }
@@ -698,6 +698,28 @@ LPCTSTR CSettingsProvider::ReadIniString(LPCTSTR key, LPCTSTR fileName, IniHashM
 	}
 }
 
+std::vector<double> CSettingsProvider::ParseCustomZoomSteps(LPCTSTR data) {
+	std::vector<double> numbers;
+	std::string sData = CT2A(data);
+	std::string part;
+
+	for (char it : sData) {
+		if (it == ',') {
+			numbers.push_back(stod(part) / 100.0);
+			part = "";
+			continue;
+		}
+		else if (it == ' ') {
+			continue;
+		}
+
+		part += it;
+	}
+
+	numbers.push_back(stod(part) / 100.0);
+	return numbers;
+}
+
 void CSettingsProvider::ReadIniFile(LPCTSTR fileName, IniHashMap* keyMap, TCHAR*& pBuffer) {
 	int bufferSize = 1024 * 2;
 
@@ -730,6 +752,7 @@ void CSettingsProvider::ReadIniFile(LPCTSTR fileName, IniHashMap* keyMap, TCHAR*
 	}
 }
 
+
 CString CSettingsProvider::GetString(LPCTSTR sKey, LPCTSTR sDefault) {
 	if (m_bUserINIExists) {
 		// try first user path

src/JPEGView/SettingsProvider.h

@@ -130,6 +130,8 @@ class CSettingsProvider
 	bool FlashWindowAlert() { return m_bFlashWindowAlert; }
 	bool BeepSoundAlert() { return m_bBeepSoundAlert; }
 	double ZoomPauseFactor() { return m_zoomPauseFactor; }  // while internally this is represented in doubles, using a whole number percent simplifies it for the user... configuring doubles is not user friendly at all
+	bool UseZoomSteps() { return m_bUseZoomSteps; }
+	std::vector<double> CustomZoomSteps() { return m_sCustomZoomSteps; }
 
 	// Returns if a user INI file exists
 	bool ExistsUserINI();
@@ -296,7 +298,8 @@ class CSettingsProvider
 	bool m_bFlashWindowAlert;
 	bool m_bBeepSoundAlert;
 	int m_zoomPauseFactor;
-
+	bool m_bUseZoomSteps;
+	std::vector<double> m_sCustomZoomSteps;
 	std::list<CUserCommand*> m_userCommands;
 	std::list<CUserCommand*> m_openWithCommands;
 
@@ -324,6 +327,7 @@ class CSettingsProvider
 	COLORREF GetColor(LPCTSTR sKey, COLORREF defaultColor);
 	Helpers::EAutoZoomMode GetAutoZoomMode(LPCTSTR sKey, Helpers::EAutoZoomMode defaultZoomMode);
 	LPCTSTR GetAutoZoomModeString(Helpers::EAutoZoomMode autoZoomMode);
+	std::vector<double> ParseCustomZoomSteps(LPCTSTR data);
 	void WriteString(LPCTSTR sKey, LPCTSTR sString);
 	void WriteDouble(LPCTSTR sKey, double dValue);
 	void WriteBool(LPCTSTR sKey, bool bValue);