From a5b9a2ed4267c5801e1b7ebbb64f5b91dcab9ee3 Mon Sep 17 00:00:00 2001
From: nick black <dankamongmen@gmail.com>
Date: Sun, 18 Jul 2021 18:01:46 -0400
Subject: [PATCH] linux fbcon blitting!

---
 src/lib/linux.c     | 79 ++++++++++++++++++++++++++++++++++++++-------
 src/lib/notcurses.c | 11 +++----
 src/lib/sprite.h    |  1 +
 src/lib/termdesc.c  |  1 +
 src/lib/termdesc.h  |  2 ++
 5 files changed, 76 insertions(+), 18 deletions(-)

diff --git a/src/lib/linux.c b/src/lib/linux.c
index aacb1d518..9b4828779 100644
--- a/src/lib/linux.c
+++ b/src/lib/linux.c
@@ -10,16 +10,63 @@
 #include <linux/kd.h>
 #include <sys/ioctl.h>
 
+int fbcon_wipe(sprixel* s, int ycell, int xcell){
+  (void)s;
+  (void)ycell;
+  (void)xcell;
+  logerror("Not yet implemented\n");
+  return -1;
+}
 
-int fbcon_blit(struct ncplane* nc, int linesize, const void* data,
+int fbcon_blit(struct ncplane* n, int linesize, const void* data,
                int leny, int lenx, const struct blitterargs* bargs){
-  (void)nc;
-  (void)linesize;
-  (void)data;
-  (void)leny;
-  (void)lenx;
-  (void)bargs;
-  logerror("Haven't implemented yet FIXME\n");
+  int cols = bargs->u.pixel.spx->dimx;
+  int rows = bargs->u.pixel.spx->dimy;
+  sprixel* s = bargs->u.pixel.spx;
+  s->glyphlen = leny * lenx * 4;
+  s->glyph = malloc(s->glyphlen);
+  if(s->glyph == NULL){
+    return -1;
+  }
+  tament* tam = NULL;
+  bool reuse = false;
+  if(n->tam){
+    if(n->leny == rows && n->lenx == cols){
+      tam = n->tam;
+      reuse = true;
+    }
+  }
+  if(!reuse){
+    tam = malloc(sizeof(*tam) * rows * cols);
+    if(tam == NULL){
+      goto error;
+    }
+    memset(tam, 0, sizeof(*tam) * rows * cols);
+  }
+  for(int l = 0 ; l < leny ; ++l){
+    size_t soffset = l * linesize;
+    const uint8_t* src = (const unsigned char*)data + soffset;
+    size_t toffset = l * lenx * 4;
+    char* dst = s->glyph + toffset;
+    for(int c = 0 ; c < lenx ; ++c){
+      memcpy(dst, src + 2, 1);
+      memcpy(dst + 1, src + 1, 1);
+      memcpy(dst + 2, src, 1);
+      memcpy(dst + 3, src + 3, 1);
+      dst += 4;
+      src += 4;
+    }
+  }
+  if(plane_blit_sixel(s, s->glyph, s->glyphlen, leny, lenx, 0, tam) < 0){
+    goto error;
+  }
+  return 1;
+
+error:
+  if(!reuse){
+    free(tam);
+  }
+  free(s->glyph);
   return -1;
 }
 
@@ -30,13 +77,21 @@ int fbcon_scrub(const struct ncpile* p, sprixel* s){
 }
 
 int fbcon_draw(const struct ncpile *p, sprixel* s, FILE* out, int y, int x){
-  (void)p;
-  (void)s;
-  (void)out;
+  (void)out; // we don't write to the stream
   (void)y;
   (void)x;
+  const tinfo* ti = &p->nc->tcache;
+  for(int l = 0 ; l < s->pixy ; ++l){
+    // FIXME pixel size isn't necessarily 4B, line isn't necessarily psize*pixx
+    size_t offset = ((l + y) * ti->pixx + x) * 4;
+    size_t lsize = ti->pixx * 4;
+    uint8_t* tl = ti->linux_fbuffer + offset;
+    // FIXME draw line
+    const char* src = s->glyph + (l * s->pixx * 4);
+    memcpy(tl, src, lsize);
+  }
   logerror("Haven't implemented yet FIXME\n");
-  return -1;
+  return 0;
 }
 
 // each row is a contiguous set of bits, starting at the msb
diff --git a/src/lib/notcurses.c b/src/lib/notcurses.c
index c9873f749..50dfa2aaa 100644
--- a/src/lib/notcurses.c
+++ b/src/lib/notcurses.c
@@ -262,15 +262,14 @@ int update_term_dimensions(int fd, int* rows, int* cols, tinfo* tcache,
     *cols = ws.ws_col;
   }
   if(tcache){
-    unsigned y, x;
     if(tcache->linux_fb_fd >= 0){
-      get_linux_fb_pixelgeom(tcache, &y, &x);
+      get_linux_fb_pixelgeom(tcache, &tcache->pixy, &tcache->pixx);
     }else{
-      y = ws.ws_ypixel;
-      x = ws.ws_xpixel;
+      tcache->pixy = ws.ws_ypixel;
+      tcache->pixx = ws.ws_xpixel;
     }
-    tcache->cellpixy = ws.ws_row ? y / ws.ws_row : 0;
-    tcache->cellpixx = ws.ws_col ? x / ws.ws_col : 0;
+    tcache->cellpixy = ws.ws_row ? tcache->pixy / ws.ws_row : 0;
+    tcache->cellpixx = ws.ws_col ? tcache->pixx / ws.ws_col : 0;
     if(tcache->cellpixy == 0 || tcache->cellpixx == 0){
       tcache->pixel_draw = NULL; // disable support
     }
diff --git a/src/lib/sprite.h b/src/lib/sprite.h
index 14f510a96..cb3efeed7 100644
--- a/src/lib/sprite.h
+++ b/src/lib/sprite.h
@@ -166,6 +166,7 @@ int kitty_wipe(sprixel* s, int ycell, int xcell);
 int kitty_wipe_animation(sprixel* s, int ycell, int xcell);
 // wipes out a cell by changing the alpha value throughout the PNG cell to 0.
 int iterm_wipe(sprixel* s, int ycell, int xcell);
+int fbcon_wipe(sprixel* s, int ycell, int xcell);
 int sixel_rebuild(sprixel* s, int ycell, int xcell, uint8_t* auxvec);
 int kitty_rebuild(sprixel* s, int ycell, int xcell, uint8_t* auxvec);
 int iterm_rebuild(sprixel* s, int ycell, int xcell, uint8_t* auxvec);
diff --git a/src/lib/termdesc.c b/src/lib/termdesc.c
index 0dff57f9b..a07e7dfe8 100644
--- a/src/lib/termdesc.c
+++ b/src/lib/termdesc.c
@@ -114,6 +114,7 @@ setup_kitty_bitmaps(tinfo* ti, int fd, int sixel_maxy_pristine){
 static inline void
 setup_fbcon_bitmaps(tinfo* ti){
   // FIXME
+  ti->pixel_wipe = fbcon_wipe;
   ti->pixel_draw = fbcon_draw;
   ti->pixel_scrub = fbcon_scrub;
   set_pixel_blitter(fbcon_blit);
diff --git a/src/lib/termdesc.h b/src/lib/termdesc.h
index 7d219fe78..a608eebda 100644
--- a/src/lib/termdesc.h
+++ b/src/lib/termdesc.h
@@ -129,6 +129,8 @@ typedef struct tinfo {
   uint16_t escindices[ESCAPE_MAX]; // table of 1-biased indices into esctable
   char* esctable;                  // packed table of escape sequences
   nccapabilities caps;             // exported to the user, when requested
+  unsigned pixy;                   // total pixel geometry, height
+  unsigned pixx;                   // total pixel geometry, width
   // we use the cell's size in pixels for pixel blitting. this information can
   // be acquired on all terminals with pixel support.
   int cellpixy;   // cell pixel height, might be 0