Add a flag for removing the Blinka logo from the REPL

There may be several reasons why we might want to remove the logo form
the REPL: a fork of CircuitPython that doesn't have the right to use the
logo, an especially small display that needs all the room it has to be
useful, displays that are especially vulnerable to burn-in, maybe even
the smaller chips where we want to save as much flash memory as
possible.

Author: deshipu

ports/atmel-samd/boards/pewpew_m4/mpconfigboard.h

@@ -36,3 +36,4 @@
 #define IGNORE_PIN_PB11     1
 
 #define SAMD5x_E5x_BOD33_LEVEL (100)
+#define CIRCUITPY_REPL_LOGO 0

py/circuitpy_mpconfig.h

@@ -480,6 +480,11 @@ void supervisor_run_background_tasks_if_tick(void);
 #define CIRCUITPY_PRECOMPUTE_QSTR_ATTR (1)
 #endif
 
+// Display the Blinka logo in the REPL on displayio displays.
+#ifndef CIRCUITPY_REPL_LOGO
+#define CIRCUITPY_REPL_LOGO (1)
+#endif
+
 // USB settings
 
 // If the port requires certain USB endpoint numbers, define these in mpconfigport.h.

supervisor/shared/display.c

@@ -45,8 +45,10 @@
 #include "shared-module/sharpdisplay/SharpMemoryFramebuffer.h"
 #endif
 
+#if CIRCUITPY_REPL_LOGO
 extern uint32_t blinka_bitmap_data[];
 extern displayio_bitmap_t blinka_bitmap;
+#endif
 extern displayio_group_t circuitpython_splash;
 
 #if CIRCUITPY_TERMINALIO
@@ -62,8 +64,13 @@ void supervisor_start_terminal(uint16_t width_px, uint16_t height_px) {
     displayio_tilegrid_t *grid = &supervisor_terminal_text_grid;
     bool tall = height_px > width_px;
     bool reset_tiles = false;
+    #if CIRCUITPY_REPL_LOGO
     uint16_t terminal_width_px = tall ? width_px : width_px - blinka_bitmap.width;
     uint16_t terminal_height_px = tall ? height_px - blinka_bitmap.height : height_px;
+    #else
+    uint16_t terminal_width_px = width_px;
+    uint16_t terminal_height_px = height_px;
+    #endif
     uint16_t width_in_tiles = terminal_width_px / grid->tile_width;
     // determine scale based on h
     if (width_in_tiles < 80) {
@@ -106,8 +113,13 @@ void supervisor_start_terminal(uint16_t width_px, uint16_t height_px) {
     if (reset_tiles) {
         uint8_t *tiles = (uint8_t *)tilegrid_tiles->ptr;
 
+        #if CIRCUITPY_REPL_LOGO
         grid->y = tall ? blinka_bitmap.height : 0;
         grid->x = tall ? 0 : blinka_bitmap.width;
+        #else
+        grid->y = 0;
+        grid->x = 0;
+        #endif
         grid->top_left_y = 0;
         if (remaining_pixels > 0) {
             grid->y -= (grid->tile_height - remaining_pixels);
@@ -167,6 +179,7 @@ void supervisor_display_move_memory(void) {
     #endif
 }
 
+#if CIRCUITPY_REPL_LOGO
 uint32_t blinka_bitmap_data[32] = {
     0x00000011, 0x11000000,
     0x00000111, 0x53100000,
@@ -281,8 +294,10 @@ displayio_tilegrid_t blinka_sprite = {
     .inline_tiles = true,
     .in_group = true
 };
+#endif
 
 #if CIRCUITPY_TERMINALIO
+#if CIRCUITPY_REPL_LOGO
 mp_obj_t members[] = { &blinka_sprite, &supervisor_terminal_text_grid, };
 mp_obj_list_t splash_children = {
     .base = {.type = &mp_type_list },
@@ -291,13 +306,32 @@ mp_obj_list_t splash_children = {
     .items = members,
 };
 #else
+mp_obj_t members[] = { &supervisor_terminal_text_grid, };
+mp_obj_list_t splash_children = {
+    .base = {.type = &mp_type_list },
+    .alloc = 1,
+    .len = 1,
+    .items = members,
+};
+#endif
+#else
+#if CIRCUITPY_REPL_LOGO
 mp_obj_t members[] = { &blinka_sprite };
 mp_obj_list_t splash_children = {
     .base = {.type = &mp_type_list },
     .alloc = 1,
     .len = 1,
     .items = members,
 };
+#else
+mp_obj_t members[] = {};
+mp_obj_list_t splash_children = {
+    .base = {.type = &mp_type_list },
+    .alloc = 0,
+    .len = 0,
+    .items = members,
+};
+#endif
 #endif
 
 displayio_group_t circuitpython_splash = {