From 63215211350215c2971090cc0e3807e8941a0e37 Mon Sep 17 00:00:00 2001
From: Paul Duncan <pabs@pablotron.org>
Date: Wed, 16 Jan 2019 08:02:30 -0500
Subject: add window icon

---
 src/sdl/main.c    |  7 +++++--
 src/sdl/sprites.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 src/sdl/sprites.h |  1 +
 3 files changed, 52 insertions(+), 2 deletions(-)

diff --git a/src/sdl/main.c b/src/sdl/main.c
index 8e96fa5..82d6682 100644
--- a/src/sdl/main.c
+++ b/src/sdl/main.c
@@ -14,6 +14,8 @@
 #include "assets.h"
 #include "solve.h"
 
+#define WINDOW_TITLE "Pablotron Sokoban"
+
 static TTF_Font *
 load_font(
   const asset_id_t id
@@ -134,7 +136,7 @@ int main(int argc, char *argv[]) {
 
   // create window
   SDL_Window *win = SDL_CreateWindow(
-    "Sokoban",
+    WINDOW_TITLE,
     SDL_WINDOWPOS_UNDEFINED,
     SDL_WINDOWPOS_UNDEFINED,
     800,
@@ -168,8 +170,9 @@ int main(int argc, char *argv[]) {
   // set level
   set_level(&draw_ctx, &ctx, level_num);
 
-  // init sprites, load font
+  // init sprites, set window icon, load font
   sprites_init(renderer, draw_ctx.sprites);
+  sprites_set_window_icon(win, SPRITE_HOME);
   draw_ctx.font = load_font(ASSET_ROBOTO_TTF);
 
   // register solve event
diff --git a/src/sdl/sprites.c b/src/sdl/sprites.c
index 51824d8..a64d011 100644
--- a/src/sdl/sprites.c
+++ b/src/sdl/sprites.c
@@ -67,3 +67,49 @@ sprites_get_rect(
   const int x = ((sprite < SPRITE_LAST) ? sprite : SPRITE_NONE) * 32;
   return (SDL_Rect) { .x = x, .y = 0, .w = 32, .h = 32 };
 }
+
+void
+sprites_set_window_icon(
+  SDL_Window * const win,
+  const sprite_t icon_sprite
+) {
+  // get asset
+  const asset_t * const asset = asset_get(ASSET_SPRITES_PNG);
+
+  // load image
+  int im_w, im_h;
+  unsigned char *im_data = stbi_load_from_memory(asset->buf, asset->len, &im_w, &im_h, NULL, 4);
+  if (!im_data) {
+    die("stbi_load(): %s", stbi_failure_reason());
+  }
+
+  // create surface
+  SDL_Surface * const src = SDL_CreateRGBSurfaceWithFormatFrom(im_data, im_w, im_h, 32, 4 * im_w, SDL_PIXELFORMAT_RGBA32);
+  if (!src) {
+    die("SDLCreateRGBSurfaceFrom(): %s", SDL_GetError());
+  }
+
+  // create icon surface
+  SDL_Surface *icon_surface = SDL_CreateRGBSurfaceWithFormat(0, 32, 32, 32, SDL_PIXELFORMAT_RGBA32);
+  if (!icon_surface) {
+    die("SDL_CreateRGBSurfaceWithFormat(): %s", SDL_GetError());
+  }
+
+  // copy from main surface
+  const SDL_Rect src_rect = { icon_sprite * 32, 0, 32, 32 };
+  if (SDL_BlitScaled(src, &src_rect, icon_surface, NULL)) {
+    die("SDL_BlitScaled(): %s", SDL_GetError());
+  }
+
+  // set window icon
+  SDL_SetWindowIcon(win, icon_surface);
+
+  // free icon surface
+  SDL_FreeSurface(icon_surface);
+
+  // free main surface
+  SDL_FreeSurface(src);
+
+  // free image data
+  stbi_image_free(im_data);
+}
diff --git a/src/sdl/sprites.h b/src/sdl/sprites.h
index cd71e7c..d0f025f 100644
--- a/src/sdl/sprites.h
+++ b/src/sdl/sprites.h
@@ -16,5 +16,6 @@ typedef enum {
 void sprites_init(SDL_Renderer * const, SDL_Texture **);
 
 SDL_Rect sprites_get_rect(const sprite_t);
+void sprites_set_window_icon(SDL_Window * const, const sprite_t);
 
 #endif /* SPRITES_H */
-- 
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