gfx: Add function to query framebuffer pitch.

nx/include/switch/display/gfx.h

@@ -85,6 +85,9 @@ void gfxGetFramebufferResolution(u32* width, u32* height);
 /// Use this to get the actual byte-size of the framebuffer for use with memset/etc.
 size_t gfxGetFramebufferSize(void);
 
+/// Use this to get the actual byte-pitch of the framebuffer for use with memset/etc.
+u32 gfxGetFramebufferPitch(void);
+
 /// Sets the \ref GfxMode.
 void gfxSetMode(GfxMode mode);
 

nx/source/display/gfx.c

@@ -530,6 +530,10 @@ size_t gfxGetFramebufferSize(void) {
     return g_gfx_singleframebuf_size;
 }
 
+u32 gfxGetFramebufferPitch(void) {
+    return g_gfx_framebuf_aligned_width*4;
+}
+
 void gfxSetMode(GfxMode mode) {
     g_gfxMode = mode;
 }