linux-kernel - [PATCH v2 2/3] drm/vkms: Add a macro for write

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Message-Id: <20240814-writeback_line_by_line-v2-2-36541c717569@bootlin.com>
Date: Wed, 14 Aug 2024 10:42:17 +0200
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>, 
 Melissa Wen <melissa.srw@...il.com>, 
 Maíra Canal <mairacanal@...eup.net>, 
 Haneen Mohammed <hamohammed.sa@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>
Cc: dri-devel@...ts.freedesktop.org, arthurgrillo@...eup.net, 
 linux-kernel@...r.kernel.org, jeremie.dautheribes@...tlin.com, 
 miquel.raynal@...tlin.com, thomas.petazzoni@...tlin.com, 
 seanpaul@...gle.com, nicolejadeyee@...gle.com, 
 Louis Chauvet <louis.chauvet@...tlin.com>
Subject: [PATCH v2 2/3] drm/vkms: Add a macro for write_line functions

As stated in [2], the write_line functions are very similar and force code
duplication. This patch add a macro to avoid code repetition.

Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
---
 drivers/gpu/drm/vkms/vkms_formats.c | 107 ++++++++++--------------------------
 1 file changed, 30 insertions(+), 77 deletions(-)

diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c
index d1309f6d307f..a25cdf656d8a 100644
--- a/drivers/gpu/drm/vkms/vkms_formats.c
+++ b/drivers/gpu/drm/vkms/vkms_formats.c
@@ -654,6 +654,31 @@ static void argb_u16_to_RGB565(u8 *out_pixel, const struct pixel_argb_u16 *in_pi
 	*pixel = cpu_to_le16(r << 11 | g << 5 | b);
 }
 
+/**
+ * WRITE_LINE() - Generic generator for write_line functions
+ *
+ * This generator can only be used for format with only one plane and block_w == block_h == 1
+ *
+ * @function_name: Name to use for the generated function
+ * @conversion_function: Fonction to use for the conversion from argb_u16 to the required format.
+ */
+#define WRITE_LINE(function_name, conversion_function)					\
+static void function_name(struct vkms_writeback_job *wb,				\
+			  struct pixel_argb_u16 *src_pixels, int count, int x_start,	\
+			  int y_start)							\
+{											\
+	u8 *dst_pixels;									\
+											\
+	packed_pixels_addr_1x1(&wb->wb_frame_info, x_start, y_start, 0, &dst_pixels);	\
+											\
+	while (count) {									\
+		(conversion_function)(dst_pixels, src_pixels);				\
+		dst_pixels += wb->wb_frame_info.fb->format->char_per_block[0];		\
+		src_pixels += 1;							\
+		count--;								\
+	}										\
+}
+
 /*
  * The following functions are write_line function for each pixel format supported by VKMS.
  *
@@ -667,85 +692,13 @@ static void argb_u16_to_RGB565(u8 *out_pixel, const struct pixel_argb_u16 *in_pi
  * [1]: https://lore.kernel.org/dri-devel/d258c8dc-78e9-4509-9037-a98f7f33b3a3@riseup.net/
  */
 
-static void ARGB8888_write_line(struct vkms_writeback_job *wb,
-				struct pixel_argb_u16 *src_pixels, int count, int x_start,
-				int y_start)
-{
-	u8 *dst_pixels;
+WRITE_LINE(ARGB8888_write_line, argb_u16_to_ARGB8888)
+WRITE_LINE(XRGB8888_write_line, argb_u16_to_XRGB8888)
 
-	packed_pixels_addr_1x1(&wb->wb_frame_info, x_start, y_start, 0, &dst_pixels);
+WRITE_LINE(ARGB16161616_write_line, argb_u16_to_ARGB16161616)
+WRITE_LINE(XRGB16161616_write_line, argb_u16_to_XRGB16161616)
 
-	while (count) {
-		argb_u16_to_ARGB8888(dst_pixels, src_pixels);
-		dst_pixels += wb->wb_frame_info.fb->format->char_per_block[0];
-		src_pixels += 1;
-		count--;
-	}
-}
-
-static void XRGB8888_write_line(struct vkms_writeback_job *wb,
-				struct pixel_argb_u16 *src_pixels, int count, int x_start,
-				int y_start)
-{
-	u8 *dst_pixels;
-
-	packed_pixels_addr_1x1(&wb->wb_frame_info, x_start, y_start, 0, &dst_pixels);
-
-	while (count) {
-		argb_u16_to_XRGB8888(dst_pixels, src_pixels);
-		dst_pixels += wb->wb_frame_info.fb->format->char_per_block[0];
-		src_pixels += 1;
-		count--;
-	}
-}
-
-static void ARGB16161616_write_line(struct vkms_writeback_job *wb,
-				    struct pixel_argb_u16 *src_pixels, int count, int x_start,
-				    int y_start)
-{
-	u8 *dst_pixels;
-
-	packed_pixels_addr_1x1(&wb->wb_frame_info, x_start, y_start, 0, &dst_pixels);
-
-	while (count) {
-		argb_u16_to_ARGB16161616(dst_pixels, src_pixels);
-		dst_pixels += wb->wb_frame_info.fb->format->char_per_block[0];
-		src_pixels += 1;
-		count--;
-	}
-}
-
-static void XRGB16161616_write_line(struct vkms_writeback_job *wb,
-				    struct pixel_argb_u16 *src_pixels, int count, int x_start,
-				    int y_start)
-{
-	u8 *dst_pixels;
-
-	packed_pixels_addr_1x1(&wb->wb_frame_info, x_start, y_start, 0, &dst_pixels);
-
-	while (count) {
-		argb_u16_to_XRGB16161616(dst_pixels, src_pixels);
-		dst_pixels += wb->wb_frame_info.fb->format->char_per_block[0];
-		src_pixels += 1;
-		count--;
-	}
-}
-
-static void RGB565_write_line(struct vkms_writeback_job *wb,
-			      struct pixel_argb_u16 *src_pixels, int count, int x_start,
-			      int y_start)
-{
-	u8 *dst_pixels;
-
-	packed_pixels_addr_1x1(&wb->wb_frame_info, x_start, y_start, 0, &dst_pixels);
-
-	while (count) {
-		argb_u16_to_RGB565(dst_pixels, src_pixels);
-		dst_pixels += wb->wb_frame_info.fb->format->char_per_block[0];
-		src_pixels += 1;
-		count--;
-	}
-}
+WRITE_LINE(RGB565_write_line, argb_u16_to_RGB565)
 
 /**
  * get_pixel_read_function() - Retrieve the correct read_line function for a specific

-- 
2.44.2