fb: cfb: Introducing a command structure for framebuffer operations

Store operations for the frame buffer as commands,
Change to a method that draws at once and transfers at finalize.

Commands are managed in a linked list and processed at the finalization.
The behavior of drawing APIs does not change.
It's just that the timing at which drawing is done to memory
is internally delayed a little.

Typical usage stores command in the buffer.
The behavior of existing drawing APIs has been changed to store
commands in this buffer.
For this reason, an argument for buffer specification is added to
the initialization function cfb_display_init.

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

samples/subsys/display/cfb/Kconfig

@@ -9,4 +9,8 @@ config CFB_SAMPLE_TRANSFER_BUFFER_SIZE
 	help
 	  Dynamically allocate display object if set 0 to this option,
 
+config CFB_SAMPLE_COMMAND_BUFFER_SIZE
+	int "Buffer size for store commands"
+	default 0
+
 source "Kconfig.zephyr"

samples/subsys/display/cfb/boards/longan_nano.conf

@@ -0,0 +1,3 @@
+CONFIG_HEAP_MEM_POOL_SIZE=4096
+CONFIG_CFB_SAMPLE_TRANSFER_BUFFER_SIZE=6400
+CONFIG_CFB_SAMPLE_COMMAND_BUFFER_SIZE=128

samples/subsys/display/cfb/src/main.c

@@ -11,6 +11,7 @@
 
 #if CONFIG_CFB_SAMPLE_TRANSFER_BUFFER_SIZE != 0
 static uint8_t transfer_buffer[CONFIG_CFB_SAMPLE_TRANSFER_BUFFER_SIZE];
+static uint8_t command_buffer[CONFIG_CFB_SAMPLE_COMMAND_BUFFER_SIZE];
 #endif
 
 int main(void)
@@ -30,6 +31,8 @@ int main(void)
 		.dev = dev,
 		.transfer_buf = transfer_buffer,
 		.transfer_buf_size = sizeof(transfer_buffer),
+		.command_buf = command_buffer,
+		.command_buf_size = sizeof(transfer_buffer),
 	};
 #endif
 

samples/subsys/display/cfb_custom_font/Kconfig

@@ -7,4 +7,8 @@ config CFB_CUSTOM_FONT_SAMPLE_TRANSFER_BUFFER_SIZE
 	int "Buffer size for image transfer"
 	default 0
 
+config CFB_CUSTOM_FONT_SAMPLE_COMMAND_BUFFER_SIZE
+	int "Buffer size for store commands"
+	default 0
+
 source "Kconfig.zephyr"

samples/subsys/display/cfb_custom_font/boards/longan_nano.conf

@@ -0,0 +1,3 @@
+CONFIG_HEAP_MEM_POOL_SIZE=4096
+CONFIG_CFB_SAMPLE_TRANSFER_BUFFER_SIZE=6400
+CONFIG_CFB_SAMPLE_COMMAND_BUFFER_SIZE=128

samples/subsys/display/cfb_custom_font/src/main.c

@@ -13,6 +13,7 @@
 
 #if CONFIG_CFB_CUSTOM_FONT_SAMPLE_TRANSFER_BUFFER_SIZE != 0
 static uint8_t transfer_buffer[CONFIG_CFB_CUSTOM_FONT_SAMPLE_TRANSFER_BUFFER_SIZE];
+static uint8_t command_buffer[CONFIG_CFB_CUSTOM_FONT_SAMPLE_COMMAND_BUFFER_SIZE];
 #endif
 
 int main(void)
@@ -27,6 +28,8 @@ int main(void)
 		.dev = dev,
 		.transfer_buf = transfer_buffer,
 		.transfer_buf_size = sizeof(transfer_buffer),
+		.command_buf = command_buffer,
+		.command_buf_size = sizeof(command_buffer),
 	};
 #endif
 

samples/subsys/display/cfb_shell/boards/longan_nano.conf

@@ -0,0 +1,3 @@
+CONFIG_HEAP_MEM_POOL_SIZE=4096
+CONFIG_CFB_SAMPLE_TRANSFER_BUFFER_SIZE=6400
+CONFIG_CFB_SAMPLE_COMMAND_BUFFER_SIZE=128