From 71b21b93399692ed4184fb673aa53d26357dba6e Mon Sep 17 00:00:00 2001
From: Shreesh Adiga <16567adigashreesh@gmail.com>
Date: Wed, 11 Nov 2020 16:19:13 +0530
Subject: vo_sixel: set output resolution based on terminal_get_size2

---
 video/out/vo_sixel.c | 39 +++++++++++++++++++++++++++++++++++++--
 1 file changed, 37 insertions(+), 2 deletions(-)

diff --git a/video/out/vo_sixel.c b/video/out/vo_sixel.c
index 1f9dd1e072..74f4d5dfd8 100644
--- a/video/out/vo_sixel.c
+++ b/video/out/vo_sixel.c
@@ -40,6 +40,8 @@
 
 #define TERMINAL_FALLBACK_DEFAULT_WIDTH 80
 #define TERMINAL_FALLBACK_DEFAULT_HEIGHT 25
+#define IMG_FALLBACK_DEFAULT_WIDTH 320
+#define IMG_FALLBACK_DEFAULT_HEIGHT 240
 
 #define ESC_HIDE_CURSOR "\033[?25l"
 #define ESC_RESTORE_CURSOR "\033[?25h"
@@ -103,6 +105,37 @@ static void validate_offset_values(struct vo* vo)
         priv->left = 1;
 }
 
+static void set_output_resolution(struct vo* vo)
+{
+    struct priv *priv = vo->priv;
+
+    // If both dimensions are set, then no need to calculate
+    if (priv->height && priv->width)
+        return;
+
+    int num_rows = TERMINAL_FALLBACK_DEFAULT_WIDTH;
+    int num_cols = TERMINAL_FALLBACK_DEFAULT_HEIGHT;
+    int total_px_width = IMG_FALLBACK_DEFAULT_WIDTH;
+    int total_px_height = IMG_FALLBACK_DEFAULT_HEIGHT;
+
+    terminal_get_size2(&num_rows, &num_cols, &total_px_width, &total_px_height);
+
+    // The maximum width is the full terminal width
+    int available_px_width = total_px_width;
+
+    // The maximum height is the amount of pixels
+    // comprising n-1 rows worth pixels.
+    // This is because sixel dump after sixel_encode adds a newline
+    // which can't be used for image display.
+    int available_px_height = (total_px_height * (num_rows - 1)) / num_rows;
+
+    if (priv->width == 0)
+        priv->width = available_px_width;
+
+    if (priv->height == 0)
+        priv->height = available_px_height;
+}
+
 static int detect_scene_change(struct vo* vo)
 {
     struct priv* priv = vo->priv;
@@ -250,6 +283,8 @@ static int reconfig(struct vo *vo, struct mp_image_params *params)
     priv->image_width  = params->w;
     priv->image_format = params->imgfmt;
 
+    set_output_resolution(vo);
+
     priv->sws->src = *params;
     priv->sws->dst = (struct mp_image_params) {
         .imgfmt = IMGFMT,
@@ -399,8 +434,8 @@ const struct vo_driver video_out_sixel = {
     .priv_size = sizeof(struct priv),
     .priv_defaults = &(const struct priv) {
         .diffuse = DIFFUSE_ATKINSON,
-        .width = 320,
-        .height = 240,
+        .width = 0,
+        .height = 0,
         .reqcolors = 256,
         .fixedpal = 0,
         .threshold = 0,
-- 
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