android: Convert to pragma once

Remove the verbose #ifndef/#define/#endif pattern for maintaining
header idempotency, and replace it with a simple #pragma once.

This simplifies the headers, and prevents redundant changes when
header files get moved.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>

src/android/jpeg/encoder.h

@@ -4,8 +4,8 @@
  *
  * encoder.h - Image encoding interface
  */
-#ifndef __ANDROID_JPEG_ENCODER_H__
-#define __ANDROID_JPEG_ENCODER_H__
+
+#pragma once
 
 #include <libcamera/base/span.h>
 
@@ -23,5 +23,3 @@ public:
 			   libcamera::Span<const uint8_t> exifData,
 			   unsigned int quality) = 0;
 };
-
-#endif /* __ANDROID_JPEG_ENCODER_H__ */

src/android/jpeg/encoder_libjpeg.h

@@ -4,8 +4,8 @@
  *
  * encoder_libjpeg.h - JPEG encoding using libjpeg
  */
-#ifndef __ANDROID_JPEG_ENCODER_LIBJPEG_H__
-#define __ANDROID_JPEG_ENCODER_LIBJPEG_H__
+
+#pragma once
 
 #include "encoder.h"
 
@@ -43,5 +43,3 @@ private:
 	bool nv_;
 	bool nvSwap_;
 };
-
-#endif /* __ANDROID_JPEG_ENCODER_LIBJPEG_H__ */

src/android/jpeg/exif.h

@@ -4,8 +4,8 @@
  *
  * exif.h - EXIF tag creator using libexif
  */
-#ifndef __ANDROID_JPEG_EXIF_H__
-#define __ANDROID_JPEG_EXIF_H__
+
+#pragma once
 
 #include <chrono>
 #include <string>
@@ -107,5 +107,3 @@ private:
 	unsigned char *exifData_;
 	unsigned int size_;
 };
-
-#endif /* __ANDROID_JPEG_EXIF_H__ */

src/android/jpeg/post_processor_jpeg.h

@@ -4,8 +4,8 @@
  *
  * post_processor_jpeg.h - JPEG Post Processor
  */
-#ifndef __ANDROID_POST_PROCESSOR_JPEG_H__
-#define __ANDROID_POST_PROCESSOR_JPEG_H__
+
+#pragma once
 
 #include "../post_processor.h"
 #include "encoder_libjpeg.h"
@@ -36,5 +36,3 @@ private:
 	EncoderLibJpeg thumbnailEncoder_;
 	Thumbnailer thumbnailer_;
 };
-
-#endif /* __ANDROID_POST_PROCESSOR_JPEG_H__ */

src/android/jpeg/thumbnailer.h

@@ -4,8 +4,8 @@
  *
  * thumbnailer.h - Simple image thumbnailer
  */
-#ifndef __ANDROID_JPEG_THUMBNAILER_H__
-#define __ANDROID_JPEG_THUMBNAILER_H__
+
+#pragma once
 
 #include <libcamera/framebuffer.h>
 #include <libcamera/geometry.h>
@@ -30,5 +30,3 @@ private:
 
 	bool valid_;
 };
-
-#endif /* __ANDROID_JPEG_THUMBNAILER_H__ */