bug#71159: [PATCH] Stipple support for MS Windows

["Elijah G." <eg642616@gmail.com>]

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This patch add stipple bitmap support to MS Windows.

I tested this patch with gnus.xbm file and other stipple pattern from
its bitmap data.

If anyone have a feedback i would gladly read it.
Thanks.


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From da8f1bb3591851c044c8fd7029bbfb9a05f947f1 Mon Sep 17 00:00:00 2001
From: "Elias G. Perez" <eg642616@gmail.com>
Date: Fri, 10 May 2024 20:36:42 -0600
Subject: [PATCH] Stipple support for MS Windows

* src/w32term.h (w32_bitmap_record): Add stipple value.

* src/w32term.c:
(w32_fill_stipple_pattern): New function.
(w32_draw_glyph_string_background, w32_draw_glyph_string_bg_rect)
(w32_draw_stretch_glyph_string): Use new stipple function.

* src/image.c:
(image_create_bitmap_from_data): Create stipple bitmap.
(image_create_bitmap_from_file): Add suuport for pixmap and create
stipple bitmap.
---
 src/image.c   | 56 ++++++++++++++++++++++++++++++++++++++++++++-----
 src/w32term.c | 58 +++++++++++++++++++++++++++++++++------------------
 src/w32term.h |  1 +
 3 files changed, 90 insertions(+), 25 deletions(-)

diff --git a/src/image.c b/src/image.c
index e93fc3183af..e2c6b29b332 100644
--- a/src/image.c
+++ b/src/image.c
@@ -214,6 +214,13 @@ #define n_planes n_image_planes
 static unsigned long *colors_in_color_table (int *n);
 #endif
 
+#ifdef HAVE_NTGUI
+static HBITMAP w32_create_pixmap_from_bitmap_data (int width,
+						   int height,
+						   char *data);
+
+#endif
+
 #if defined (HAVE_WEBP) || defined (HAVE_GIF)
 static void anim_prune_animation_cache (Lisp_Object);
 #endif
@@ -602,7 +609,12 @@ image_create_bitmap_from_data (struct frame *f, char *bits,
 			 FRAME_DISPLAY_INFO (XFRAME (frame))->n_planes,
 			 FRAME_DISPLAY_INFO (XFRAME (frame))->n_cbits,
 			 bits);
-  if (! bitmap)
+  Emacs_Pixmap stipple;
+
+  /* Convert X bitmap to W32 bitmap */
+  stipple = w32_create_pixmap_from_bitmap_data (width, height, bits);
+
+  if (!bitmap || !stipple)
     return -1;
 #endif /* HAVE_NTGUI */
 
@@ -681,6 +693,7 @@ image_create_bitmap_from_data (struct frame *f, char *bits,
 
 #ifdef HAVE_NTGUI
   dpyinfo->bitmaps[id - 1].pixmap = bitmap;
+  dpyinfo->bitmaps[id - 1].stipple = stipple;
   dpyinfo->bitmaps[id - 1].hinst = NULL;
   dpyinfo->bitmaps[id - 1].depth = 1;
 #endif /* HAVE_NTGUI */
@@ -699,7 +712,7 @@ image_create_bitmap_from_data (struct frame *f, char *bits,
 #endif /* defined HAVE_ANDROID && !defined ANDROID_STUBIFY */
 
 #if defined HAVE_HAIKU || defined HAVE_NS || defined HAVE_PGTK	\
-  || defined HAVE_ANDROID
+  || defined HAVE_ANDROID || defined HAVE_NTGUI
 static char *slurp_file (image_fd, ptrdiff_t *);
 static Lisp_Object image_find_image_fd (Lisp_Object, image_fd *);
 static bool xbm_read_bitmap_data (struct frame *, char *, char *,
@@ -711,10 +724,43 @@ image_create_bitmap_from_data (struct frame *f, char *bits,
 ptrdiff_t
 image_create_bitmap_from_file (struct frame *f, Lisp_Object file)
 {
-#if defined (HAVE_NTGUI)
-  return -1;  /* W32_TODO : bitmap support */
-#else
   Display_Info *dpyinfo = FRAME_DISPLAY_INFO (f);
+
+#ifdef HAVE_NTGUI
+  ptrdiff_t id, size;
+  int width, height, rc;
+  image_fd fd;
+  char *contents, *data;
+  Emacs_Pixmap bitmap;
+
+  if (!STRINGP (image_find_image_fd (file, &fd)))
+    return -1;
+
+  contents = slurp_file (fd, &size);
+
+  if (!contents)
+    return -1;
+
+  rc = xbm_read_bitmap_data (f, contents, contents + size,
+			     &width, &height, &data, 0);
+
+  if (!rc)
+    {
+      xfree (contents);
+      return -1;
+    }
+
+  id = image_allocate_bitmap_record (f);
+  bitmap = w32_create_pixmap_from_bitmap_data (width, height, data);
+
+  dpyinfo->bitmaps[id - 1].height = width;
+  dpyinfo->bitmaps[id - 1].width = height;
+  dpyinfo->bitmaps[id - 1].stipple = bitmap;
+  dpyinfo->bitmaps[id - 1].file = xlispstrdup (file);
+
+  xfree (contents);
+  xfree (data);
+  return id;
 #endif
 
 #ifdef HAVE_NS
diff --git a/src/w32term.c b/src/w32term.c
index a9aff304771..b68f0b4e3d6 100644
--- a/src/w32term.c
+++ b/src/w32term.c
@@ -1248,6 +1248,37 @@ w32_clear_glyph_string_rect (struct glyph_string *s,
                  real_w, real_h);
 }
 
+/* Fill background with bitmap pattern from S at specified position
+   given by X and Y.  WIDTH and HEIGHT specifies bitmap size, GC is
+   used to get foreground and background color context and HDC where
+   fill it.  */
+
+static void
+w32_fill_stipple_pattern (HDC hdc, struct glyph_string *s, Emacs_GC *gc,
+			  int x, int y, unsigned int width, unsigned int height)
+{
+  /* BUG: stipple bitmap has the inverted colors, inverting
+     those 2 functions color must fix this. */
+
+  SetTextColor (hdc, gc->background);
+  SetBkColor (hdc, gc->foreground);
+
+  Emacs_Pixmap bm;
+  HBRUSH hb;
+  RECT r;
+
+  bm = FRAME_DISPLAY_INFO (s->f)->bitmaps[s->face->stipple - 1].stipple;
+  hb = CreatePatternBrush (bm);
+
+  r.left = x;
+  r.top = y;
+  r.right = x + width;
+  r.bottom = y + height;
+
+  FillRect (hdc, &r, hb);
+
+  DeleteObject (hb);
+}
 
 /* Draw the background of glyph_string S.  If S->background_filled_p
    is non-zero don't draw it.  FORCE_P non-zero means draw the
@@ -1264,21 +1295,16 @@ w32_draw_glyph_string_background (struct glyph_string *s, bool force_p)
     {
       int box_line_width = max (s->face->box_horizontal_line_width, 0);
 
-#if 0 /* TODO: stipple */
       if (s->stippled_p)
 	{
 	  /* Fill background with a stipple pattern.  */
-	  XSetFillStyle (s->display, s->gc, FillOpaqueStippled);
-	  XFillRectangle (s->display, FRAME_W32_WINDOW (s->f), s->gc, s->x,
-			  s->y + box_line_width,
-			  s->background_width,
-			  s->height - 2 * box_line_width);
-	  XSetFillStyle (s->display, s->gc, FillSolid);
+	  w32_fill_stipple_pattern (s->hdc, s, s->gc, s->x,
+				    s->y + box_line_width,
+				    s->background_width,
+				    s->height - 2 * box_line_width);
 	  s->background_filled_p = true;
 	}
-      else
-#endif
-           if (FONT_HEIGHT (s->font) < s->height - 2 * box_line_width
+      else if (FONT_HEIGHT (s->font) < s->height - 2 * box_line_width
 	       /* When xdisp.c ignores FONT_HEIGHT, we cannot trust
 		  font dimensions, since the actual glyphs might be
 		  much smaller.  So in that case we always clear the
@@ -2286,16 +2312,12 @@ w32_draw_image_foreground_1 (struct glyph_string *s, HBITMAP pixmap)
 static void
 w32_draw_glyph_string_bg_rect (struct glyph_string *s, int x, int y, int w, int h)
 {
-#if 0 /* TODO: stipple */
   if (s->stippled_p)
     {
       /* Fill background with a stipple pattern.  */
-      XSetFillStyle (s->display, s->gc, FillOpaqueStippled);
-      XFillRectangle (s->display, FRAME_W32_WINDOW (s->f), s->gc, x, y, w, h);
-      XSetFillStyle (s->display, s->gc, FillSolid);
+      w32_fill_stipple_pattern (s->hdc, s, s->gc, x, y, w, h);
     }
   else
-#endif
     w32_clear_glyph_string_rect (s, x, y, w, h);
 }
 
@@ -2500,16 +2522,12 @@ w32_draw_stretch_glyph_string (struct glyph_string *s)
 	  get_glyph_string_clip_rect (s, &r);
 	  w32_set_clip_rectangle (hdc, &r);
 
-#if 0 /* TODO: stipple */
 	  if (s->face->stipple)
 	    {
 	      /* Fill background with a stipple pattern.  */
-	      XSetFillStyle (s->display, gc, FillOpaqueStippled);
-	      XFillRectangle (s->display, FRAME_W32_WINDOW (s->f), gc, x, y, w, h);
-	      XSetFillStyle (s->display, gc, FillSolid);
+	      w32_fill_stipple_pattern (s->hdc, s, gc, x, y, w, h);
 	    }
 	  else
-#endif
             {
               w32_fill_area (s->f, s->hdc, gc->background, x, y, w, h);
             }
diff --git a/src/w32term.h b/src/w32term.h
index 3120c8bd71f..1eb6a660248 100644
--- a/src/w32term.h
+++ b/src/w32term.h
@@ -58,6 +58,7 @@ #define CP_DEFAULT 1004
 {
   Emacs_Pixmap pixmap;
   char *file;
+  Emacs_Pixmap stipple;
   HINSTANCE hinst; /* Used to load the file */
   int refcount;
   /* Record some info about this pixmap.  */
-- 
2.44.0.windows.1