imageview: Add pressing A to switch between regular and temporal dithering

Author: RocketRobz

imageview/arm9/source/graphics/graphics.h

@@ -22,6 +22,8 @@
 #include <nds/ndstypes.h>
 #include <string>
 
+extern bool doubleBuffer;
+
 void SetBrightness(u8 screen, s8 bright);
 void imageLoad(const char* filename);
 void bgLoad(void);

imageview/arm9/source/language.inl

@@ -1,3 +1,5 @@
+STRING(A_REGULAR_DITHERING, "\\A Switch to regular dithering")
+STRING(A_TEMPORAL_DITHERING, "\\A Switch to temporal dithering")
 STRING(BACK, "Back")
 
 // SD removal errors

imageview/arm9/source/main.cpp

@@ -32,6 +32,7 @@ bool fadeType = false;		// false = out, true = in
 bool fadeSpeed = true;		// false = slow (for DSi launch effect), true = fast
 bool controlTopBright = true;
 bool controlBottomBright = true;
+bool supportsDoubleBuffer = false;
 
 extern void ClearBrightness();
 extern int imageType;
@@ -109,6 +110,17 @@ void customSleep() {
 	*(int*)0x02003004 = 2; // Fade in sound
 }
 
+void printText(void) {
+	if (ms().macroMode) return;
+
+	clearText(false);
+	if (supportsDoubleBuffer) {
+		printSmall(false, 0, 88, doubleBuffer ? STR_A_REGULAR_DITHERING : STR_A_TEMPORAL_DITHERING, Alignment::center);
+	}
+	printSmall(false, -88, 174, STR_BACK, Alignment::center);
+	updateText(false);
+}
+
 //---------------------------------------------------------------------------------
 int imageViewer(void) {
 //---------------------------------------------------------------------------------
@@ -137,10 +149,8 @@ int imageViewer(void) {
 
 	imageLoad((strlen(imagePathChar) >= 2) ? imagePathChar : "nitro:/graphics/test.png");
 	bgLoad();
-	if (!ms().macroMode) {
-		printSmall(false, -88, 174, STR_BACK, Alignment::center);
-		updateText(false);
-	}
+	supportsDoubleBuffer = doubleBuffer;
+	printText();
 
 	snd();
 	snd().beginStream();
@@ -171,6 +181,12 @@ int imageViewer(void) {
 			customSleep();
 		}
 
+		if ((pressed & KEY_A) && supportsDoubleBuffer) {
+			doubleBuffer = !doubleBuffer;
+			printText();
+			snd().playSwitch();
+		}
+
 		if ((pressed & KEY_B) || ((pressed & KEY_TOUCH) && touch.px >= 0 && touch.px < 80 && touch.py >= 169 && touch.py < 192)) {
 			loadROMselect();
 		}

imageview/nitrofiles/languages/en/language.ini

@@ -1,4 +1,6 @@
 [LANGUAGE]
+A_REGULAR_DITHERING = \A Switch to regular dithering
+A_TEMPORAL_DITHERING = \A Switch to temporal dithering
 BACK = Back
 ERROR_HAS_OCCURRED = An error has occurred.
 DISABLE_SD_REMOVAL_CHECK = Please turn off the power, turn\nthe power back on, relaunch\nTWiLight Menu++, hold SELECT to\nopen TWLMenu++ Settings, and\ndisable SD removal detection.