From 3e366ebe0e70d1c1f4e450b3e11e6176ca06613f Mon Sep 17 00:00:00 2001
From: nick black <dankamongmen@gmail.com>
Date: Wed, 7 Jul 2021 20:28:26 -0400
Subject: [PATCH] set up framebuffer graphics

---
 src/info/main.c    |  2 ++
 src/lib/input.h    |  4 ++++
 src/lib/linux.c    | 22 ++++++++++++++++++++++
 src/lib/sprite.h   |  3 +++
 src/lib/termdesc.c | 10 ++++++++++
 5 files changed, 41 insertions(+)

diff --git a/src/info/main.c b/src/info/main.c
index 1366a803d..fe70c6c3b 100644
--- a/src/info/main.c
+++ b/src/info/main.c
@@ -334,6 +334,8 @@ tinfo_debug_bitmaps(struct ncplane* n, const tinfo* ti, const char* indent){
       }else{
         ncplane_printf(n, "%ssixel colorregs: %u\n", indent, ti->color_registers);
       }
+    }else if(ti->linux_fb_fd >= 0){
+      ncplane_printf(n, "%sframebuffer graphics supported\n", indent);
     }else if(ti->pixel_move == NULL){
       ncplane_printf(n, "%siTerm2 graphics support\n", indent);
     }else if(ti->sixel_maxy_pristine){
diff --git a/src/lib/input.h b/src/lib/input.h
index 78657a894..d503d67e2 100644
--- a/src/lib/input.h
+++ b/src/lib/input.h
@@ -16,7 +16,11 @@ struct ncsharedstats;
 
 typedef enum {
     TERMINAL_UNKNOWN,       // no useful information from queries; use termname
+    // the very limited linux VGA/serial console, or possibly the (deprecated,
+    // pixel-drawable, RGBA8888) linux framebuffer console. *not* fbterm.
     TERMINAL_LINUX,         // ioctl()s
+    // the linux KMS/DRM console, *not* kmscon, but DRM direct dumb buffers
+    TERMINAL_LINUXDRM,      // ioctl()s
     TERMINAL_XTERM,         // XTVERSION == 'XTerm(ver)'
     TERMINAL_VTE,           // TDA: "~VTE"
     TERMINAL_KITTY,         // XTGETTCAP['TN'] == 'xterm-kitty'
diff --git a/src/lib/linux.c b/src/lib/linux.c
index 43495e1d5..09cc62900 100644
--- a/src/lib/linux.c
+++ b/src/lib/linux.c
@@ -10,6 +10,28 @@
 #include <linux/kd.h>
 #include <sys/ioctl.h>
 
+
+int fbcon_blit(struct ncplane* nc, int linesize, const void* data,
+               int leny, int lenx, const struct blitterargs* bargs, int bpp){
+  (void)nc;
+  (void)linesize;
+  (void)data;
+  (void)leny;
+  (void)lenx;
+  (void)bargs;
+  (void)bpp;
+  logerror("Haven't implemented yet FIXME\n");
+  return -1;
+}
+
+int fbcon_draw(const struct ncpile *p, sprixel* s, FILE* out){
+  (void)p;
+  (void)s;
+  (void)out;
+  logerror("Haven't implemented yet FIXME\n");
+  return -1;
+}
+
 // each row is a contiguous set of bits, starting at the msb
 static inline size_t
 row_bytes(const struct console_font_op* cfo){
diff --git a/src/lib/sprite.h b/src/lib/sprite.h
index 2df2cd98a..e8ed045c6 100644
--- a/src/lib/sprite.h
+++ b/src/lib/sprite.h
@@ -193,6 +193,9 @@ int iterm_blit(struct ncplane* nc, int linesize, const void* data,
                int leny, int lenx, const struct blitterargs* bargs);
 int kitty_blit_animated(struct ncplane* n, int linesize, const void* data,
                         int leny, int lenx, const struct blitterargs* bargs);
+int fbcon_blit(struct ncplane* nc, int linesize, const void* data,
+               int leny, int lenx, const struct blitterargs* bargs);
+int fbcon_draw(const struct ncpile *p, sprixel* s, FILE* out);
 
 #ifdef __cplusplus
 }
diff --git a/src/lib/termdesc.c b/src/lib/termdesc.c
index 74adefc19..35e0a4381 100644
--- a/src/lib/termdesc.c
+++ b/src/lib/termdesc.c
@@ -109,6 +109,15 @@ setup_kitty_bitmaps(tinfo* ti, int fd, int sixel_maxy_pristine){
   sprite_init(ti, fd);
 }
 
+// kitty 0.19.3 didn't have C=1, and thus needs sixel_maxy_pristine. it also
+// lacked animation, and thus requires the older interface.
+static inline void
+setup_fbcon_bitmaps(tinfo* ti){
+  // FIXME
+  ti->pixel_draw = fbcon_draw;
+  set_pixel_blitter(fbcon_blit);
+}
+
 static bool
 query_rgb(void){
   bool rgb = (tigetflag("RGB") > 1 || tigetflag("Tc") > 1);
@@ -543,6 +552,7 @@ apply_term_heuristics(tinfo* ti, const char* termname, int fd,
     }
     if(ti->linux_fb_fd >= 0){
       termname = "Linux framebuffer";
+      setup_fbcon_bitmaps(ti);
     }else{
       termname = "Linux console";
     }