chore(panic): Use ctx instead of gfx

Use ctx to display the panic message.  The implementation contains a few
safeguards to hopefully deal with any breakage that happended before the
panic.

epicardium/os/panic.c

@@ -12,16 +12,17 @@
 #include "os/core.h"
 #include "modules/modules.h"
 #include "drivers/drivers.h"
+#include "drivers/display/epic_ctx.h"
+#include "drivers/display/lcd.h"
 
 #include "card10.h"
 #include "card10-version.h"
 
-#include "gfx.h"
-#include "display.h"
 #include "LCD_Driver.h"
 
 #include <stdio.h>
 #include <stdarg.h>
+#include <string.h>
 
 static void faultsplash(const char *msg);
 
@@ -121,34 +122,37 @@ static void faultsplash(const char *msg)
 {
 	LCD_SetBacklight(100);
 
-	gfx_copy_region_rle_mono(
-		&display_screen,
-		0,
-		0,
-		160,
-		80,
-		sizeof(faultsplash_rle),
-		faultsplash_rle
-	);
+	size_t idx = 0;
+	for (size_t i = 0; i < sizeof(faultsplash_rle); i++) {
+		uint8_t color  = (faultsplash_rle[i] & 0x80) ? 0xff : 0x00;
+		uint8_t length = faultsplash_rle[i] & 0x7f;
 
-	gfx_puts(&Font20, &display_screen, 80, 5, "Panic", 0xf800, 0xf800);
+		memset(&epicardium_ctx_fb[idx], color, length * 2);
+		idx += length * 2;
+	}
+
+	lcd_write_fb(epicardium_ctx_fb);
+
+	/* make sure we get a clean graphics ctx */
+	disp_ctx_reinit();
+
+	ctx_text_baseline(epicardium_ctx, CTX_TEXT_BASELINE_TOP);
+	ctx_font_size(epicardium_ctx, 20.0f);
+	ctx_move_to(epicardium_ctx, 80.0f, 8.0f);
+	ctx_rgba8(epicardium_ctx, 0xff, 0x00, 0x00, 0xff);
+	ctx_text(epicardium_ctx, "Panic");
 
+	ctx_font_size(epicardium_ctx, 12.0f);
+	ctx_rgba8(epicardium_ctx, 197, 197, 197, 0xff);
 	size_t len   = strlen(msg);
 	char buf[15] = { 0 };
-	int offset   = 34;
+	float offset = 34.0f;
 	for (size_t i = 0; i < len; i += 14) {
 		strncpy(buf, &msg[i], 14);
-		gfx_puts(
-			&Font12,
-			&display_screen,
-			52,
-			offset,
-			buf,
-			0xc618,
-			0xc618
-		);
-		offset += 12;
+		ctx_move_to(epicardium_ctx, 52.0f, offset);
+		ctx_text(epicardium_ctx, buf);
+		offset += 12.0f;
 	}
 
-	gfx_update(&display_screen);
+	lcd_write_fb(epicardium_ctx_fb);
 }