bug#31288: 27.0.50; [PATCH] Make cairo build somewhat usable

bug#31288: 27.0.50; [PATCH] Make cairo build somewhat usable

[Ari Roponen]

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Attached are two patches to make --with-cairo builds more usable.

First patch tries to fix screen corruption, and the second patch allows
cairo builds to display images.

These patches are only slightly tested, but I hope they will be useful.

In GNU Emacs 27.0.50 (build 10, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
 of 2018-04-27 built on arirop
Repository revision: caa93364d47bd28633cc065e31dd5972a1e916d5
Windowing system distributor 'Fedora Project', version 11.0.11906000
System Description: Fedora 28 (Twenty Eight)


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[-- Attachment #2: 0001-Fix-cairo-problems.patch --]
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From 3e93c1a5290bbed7a9b923e1a16f930ec0fbd74a Mon Sep 17 00:00:00 2001
From: Ari Roponen <ari.roponen@gmail.com>
Date: Fri, 27 Apr 2018 15:13:12 +0300
Subject: [PATCH 1/2] Fix cairo problems

* src/xterm.c (x_begin_cr_clip): Create image surface.
(x_update_end) [USE_CAIRO]: Disable GTK3-specific code for now.
(x_scroll_run) [USE_CAIRO]: Implement scrolling.
---
 src/xterm.c | 41 ++++++++++++++++++++++++++++-------------
 1 file changed, 28 insertions(+), 13 deletions(-)

diff --git a/src/xterm.c b/src/xterm.c
index 6ab4a03002..52fe24e0fb 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -360,17 +360,12 @@ x_begin_cr_clip (struct frame *f, GC gc)
 
       if (! FRAME_CR_SURFACE (f))
         {
-          cairo_surface_t *surface;
-          surface = cairo_xlib_surface_create (FRAME_X_DISPLAY (f),
-                                               FRAME_X_DRAWABLE (f),
-                                               FRAME_DISPLAY_INFO (f)->visual,
-                                               FRAME_PIXEL_WIDTH (f),
-                                               FRAME_PIXEL_HEIGHT (f));
-          cr = cairo_create (surface);
-          cairo_surface_destroy (surface);
-        }
-      else
-        cr = cairo_create (FRAME_CR_SURFACE (f));
+	  FRAME_CR_SURFACE (f) =
+	    cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
+					FRAME_PIXEL_WIDTH (f),
+					FRAME_PIXEL_HEIGHT (f));
+	}
+      cr = cairo_create (FRAME_CR_SURFACE (f));
       FRAME_CR_CONTEXT (f) = cr;
     }
   cairo_save (cr);
@@ -1236,7 +1231,8 @@ x_update_end (struct frame *f)
     {
       cairo_t *cr = 0;
       block_input();
-#if defined (USE_GTK) && defined (HAVE_GTK3)
+      /* FIXME */
+#if 0 && defined (USE_GTK) && defined (HAVE_GTK3)
       if (FRAME_GTK_WIDGET (f))
         {
           GdkWindow *w = gtk_widget_get_window (FRAME_GTK_WIDGET (f));
@@ -4271,7 +4267,26 @@ x_scroll_run (struct window *w, struct run *run)
   x_clear_cursor (w);
 
 #ifdef USE_CAIRO
-  SET_FRAME_GARBAGED (f);
+  if (FRAME_CR_CONTEXT (f))
+    {
+      cairo_surface_t *s = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
+						       width, height);
+      cairo_t *cr = cairo_create (s);
+      cairo_set_source_surface (cr, cairo_get_target (FRAME_CR_CONTEXT (f)),
+				-x, -from_y);
+      cairo_paint (cr);
+      cairo_destroy (cr);
+
+      cr = FRAME_CR_CONTEXT (f);
+      cairo_save (cr);
+      cairo_set_source_surface (cr, s, 0, to_y);
+      cairo_rectangle (cr, x, to_y, width, height);
+      cairo_fill (cr);
+      cairo_restore (cr);
+      cairo_surface_destroy (s);
+    } else {
+    SET_FRAME_GARBAGED (f);
+  }
 #else
   XCopyArea (FRAME_X_DISPLAY (f),
              FRAME_X_DRAWABLE (f), FRAME_X_DRAWABLE (f),
-- 
2.17.0


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From 6a379d983544b3e1b241860854646ca039724151 Mon Sep 17 00:00:00 2001
From: Ari Roponen <ari.roponen@gmail.com>
Date: Fri, 27 Apr 2018 15:14:36 +0300
Subject: [PATCH 2/2] Add partial image support for cairo builds

* src/image.c (lookup_rgb_color): Add cairo support.
(jpeg_load_body): Fix preprocessor symbol.  Move colors definition
into non-cairo part.
(imagemagick_load_image) [USE_CAIRO]: Add partial support for
cairo.
---
 src/image.c | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/src/image.c b/src/image.c
index 37416c1616..4c3f6c5ab0 100644
--- a/src/image.c
+++ b/src/image.c
@@ -4629,6 +4629,8 @@ lookup_rgb_color (struct frame *f, int r, int g, int b)
   return PALETTERGB (r >> 8, g >> 8, b >> 8);
 #elif defined HAVE_NS
   return RGB_TO_ULONG (r >> 8, g >> 8, b >> 8);
+#elif defined USE_CAIRO
+  return (0xffu << 24) | (r << 16) | (g << 8) | b;
 #else
   xsignal1 (Qfile_error,
 	    build_string ("This Emacs mishandles this image file type"));
@@ -6702,10 +6704,10 @@ jpeg_load_body (struct frame *f, struct image *img,
   FILE *volatile fp = NULL;
   JSAMPARRAY buffer;
   int row_stride, x, y;
-  unsigned long *colors;
   int width, height;
   int i, ir, ig, ib;
 #ifndef USE_CAIRO
+  unsigned long *colors;
   XImagePtr ximg = NULL;
 #endif
 
@@ -6823,7 +6825,7 @@ jpeg_load_body (struct frame *f, struct image *img,
     else
       ir = 0, ig = 0, ib = 0;
 
-#ifndef CAIRO
+#ifndef USE_CAIRO
     /* Use the color table mechanism because it handles colors that
        cannot be allocated nicely.  Such colors will be replaced with
        a default color, and we don't have to care about which colors
@@ -8551,6 +8553,9 @@ imagemagick_load_image (struct frame *f, struct image *img,
   double rotation;
   char hint_buffer[MaxTextExtent];
   char *filename_hint = NULL;
+#ifdef USE_CAIRO
+  void *data;
+#endif
 
   /* Initialize the ImageMagick environment.  */
   static bool imagemagick_initialized;
@@ -8751,6 +8756,19 @@ imagemagick_load_image (struct frame *f, struct image *img,
   /* We can now get a valid pixel buffer from the imagemagick file, if all
      went ok.  */
 
+#ifdef USE_CAIRO
+  data = xmalloc (width * height * 4);
+#ifdef HAVE_MAGICKEXPORTIMAGEPIXELS
+  MagickExportImagePixels (image_wand, 0, 0, width, height,
+			   "BGRA", CharPixel, data);
+#else
+  /* FIXME: Implement this. For now, make it white. */
+  memset(data, 0xff, width * height * 4);
+#endif
+  create_cairo_image_surface (img, data, width, height);
+  goto done;
+#endif /* USE_CAIRO */
+
   init_color_table ();
 
 #if defined (HAVE_MAGICKEXPORTIMAGEPIXELS) && ! defined (HAVE_NS)
@@ -8861,6 +8879,9 @@ imagemagick_load_image (struct frame *f, struct image *img,
   /* Put ximg into the image.  */
   image_put_x_image (f, img, ximg, 0);
 
+#ifdef USE_CAIRO
+ done:
+#endif
   /* Final cleanup. image_wand should be the only resource left. */
   DestroyMagickWand (image_wand);
   if (bg_wand) DestroyPixelWand (bg_wand);
-- 
2.17.0

bug#31288: 27.0.50; [PATCH] Make cairo build somewhat usable

[Eli Zaretskii]

> From: Ari Roponen <ari.roponen@gmail.com>
> Date: Fri, 27 Apr 2018 16:19:16 +0300
> 
> Attached are two patches to make --with-cairo builds more usable.
> 
> First patch tries to fix screen corruption, and the second patch allows
> cairo builds to display images.

Thank you for working on this.

Please allow me a couple of minor comments on the changes:

> @@ -1236,7 +1231,8 @@ x_update_end (struct frame *f)
>      {
>        cairo_t *cr = 0;
>        block_input();
> -#if defined (USE_GTK) && defined (HAVE_GTK3)
> +      /* FIXME */
> +#if 0 && defined (USE_GTK) && defined (HAVE_GTK3)
>        if (FRAME_GTK_WIDGET (f))
>          {
>            GdkWindow *w = gtk_widget_get_window (FRAME_GTK_WIDGET (f));

This hunk doesn't look right.  If the code in question causes some
trouble to a Cairo build, please ifdef it out only when USE_CAIRO is
defined, not unconditionally.  And if that still needs a FIXME
comment, please add some description of what needs to be fixed and
why.

> +      cairo_surface_destroy (s);
> +    } else {
> +    SET_FRAME_GARBAGED (f);

Please use GNU style of braces.

Thanks again.

bug#31288: 27.0.50; [PATCH] Make cairo build somewhat usable

[Ari Roponen]

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Eli Zaretskii <eliz@gnu.org> writes:

>
> Please allow me a couple of minor comments on the changes:
>
>> @@ -1236,7 +1231,8 @@ x_update_end (struct frame *f)
>>      {
>>        cairo_t *cr = 0;
>>        block_input();
>> -#if defined (USE_GTK) && defined (HAVE_GTK3)
>> +      /* FIXME */
>> +#if 0 && defined (USE_GTK) && defined (HAVE_GTK3)
>>        if (FRAME_GTK_WIDGET (f))
>>          {
>>            GdkWindow *w = gtk_widget_get_window (FRAME_GTK_WIDGET (f));
>
> This hunk doesn't look right.  If the code in question causes some
> trouble to a Cairo build, please ifdef it out only when USE_CAIRO is
> defined, not unconditionally.  And if that still needs a FIXME
> comment, please add some description of what needs to be fixed and
> why.
>

That hunk is inside #ifdef USE_CAIRO, like almost the whole body of
x_update_end.

>> +      cairo_surface_destroy (s);
>> +    } else {
>> +    SET_FRAME_GARBAGED (f);
>
> Please use GNU style of braces.
>

Done. New patch attached.


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From dd7b085d569be5f1eb4412e28ac73f3f304eeb0f Mon Sep 17 00:00:00 2001
From: Ari Roponen <ari.roponen@gmail.com>
Date: Fri, 27 Apr 2018 15:13:12 +0300
Subject: [PATCH 1/2] Fix cairo problems

* src/xterm.c (x_begin_cr_clip): Create image surface.
(x_update_end) [USE_CAIRO]: Disable GTK3-specific code for now.
(x_scroll_run) [USE_CAIRO]: Implement scrolling.
---
 src/xterm.c | 43 ++++++++++++++++++++++++++++++-------------
 1 file changed, 30 insertions(+), 13 deletions(-)

diff --git a/src/xterm.c b/src/xterm.c
index 6ab4a03002..2a1c7e9edc 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -360,17 +360,12 @@ x_begin_cr_clip (struct frame *f, GC gc)
 
       if (! FRAME_CR_SURFACE (f))
         {
-          cairo_surface_t *surface;
-          surface = cairo_xlib_surface_create (FRAME_X_DISPLAY (f),
-                                               FRAME_X_DRAWABLE (f),
-                                               FRAME_DISPLAY_INFO (f)->visual,
-                                               FRAME_PIXEL_WIDTH (f),
-                                               FRAME_PIXEL_HEIGHT (f));
-          cr = cairo_create (surface);
-          cairo_surface_destroy (surface);
-        }
-      else
-        cr = cairo_create (FRAME_CR_SURFACE (f));
+	  FRAME_CR_SURFACE (f) =
+	    cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
+					FRAME_PIXEL_WIDTH (f),
+					FRAME_PIXEL_HEIGHT (f));
+	}
+      cr = cairo_create (FRAME_CR_SURFACE (f));
       FRAME_CR_CONTEXT (f) = cr;
     }
   cairo_save (cr);
@@ -1236,7 +1231,8 @@ x_update_end (struct frame *f)
     {
       cairo_t *cr = 0;
       block_input();
-#if defined (USE_GTK) && defined (HAVE_GTK3)
+      /* FIXME */
+#if 0 && defined (USE_GTK) && defined (HAVE_GTK3)
       if (FRAME_GTK_WIDGET (f))
         {
           GdkWindow *w = gtk_widget_get_window (FRAME_GTK_WIDGET (f));
@@ -4271,7 +4267,28 @@ x_scroll_run (struct window *w, struct run *run)
   x_clear_cursor (w);
 
 #ifdef USE_CAIRO
-  SET_FRAME_GARBAGED (f);
+  if (FRAME_CR_CONTEXT (f))
+    {
+      cairo_surface_t *s = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
+						       width, height);
+      cairo_t *cr = cairo_create (s);
+      cairo_set_source_surface (cr, cairo_get_target (FRAME_CR_CONTEXT (f)),
+				-x, -from_y);
+      cairo_paint (cr);
+      cairo_destroy (cr);
+
+      cr = FRAME_CR_CONTEXT (f);
+      cairo_save (cr);
+      cairo_set_source_surface (cr, s, 0, to_y);
+      cairo_rectangle (cr, x, to_y, width, height);
+      cairo_fill (cr);
+      cairo_restore (cr);
+      cairo_surface_destroy (s);
+    }
+  else
+    {
+      SET_FRAME_GARBAGED (f);
+    }
 #else
   XCopyArea (FRAME_X_DISPLAY (f),
              FRAME_X_DRAWABLE (f), FRAME_X_DRAWABLE (f),
-- 
2.17.0

bug#31288: 27.0.50; [PATCH] Make cairo build somewhat usable

[Eli Zaretskii]

> From: Ari Roponen <ari.roponen@gmail.com>
> Cc: 31288@debbugs.gnu.org
> Date: Fri, 27 Apr 2018 17:35:58 +0300
> 
> >> -#if defined (USE_GTK) && defined (HAVE_GTK3)
> >> +      /* FIXME */
> >> +#if 0 && defined (USE_GTK) && defined (HAVE_GTK3)
> >>        if (FRAME_GTK_WIDGET (f))
> >>          {
> >>            GdkWindow *w = gtk_widget_get_window (FRAME_GTK_WIDGET (f));
> >
> > This hunk doesn't look right.  If the code in question causes some
> > trouble to a Cairo build, please ifdef it out only when USE_CAIRO is
> > defined, not unconditionally.  And if that still needs a FIXME
> > comment, please add some description of what needs to be fixed and
> > why.
> >
> 
> That hunk is inside #ifdef USE_CAIRO, like almost the whole body of
> x_update_end.

Ah, sorry I missed that.  Still, what is the FIXME there? why not
simply remove that part?

bug#31288: 27.0.50; [PATCH] Make cairo build somewhat usable

[Ari Roponen]

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Eli Zaretskii <eliz@gnu.org> writes:

> Ah, sorry I missed that.  Still, what is the FIXME there? why not
> simply remove that part?

Ok. Now it's removed. New patch attached.

Thank you for your comments.


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From d54819cb834fddce7488e8f6ebb392a53978b421 Mon Sep 17 00:00:00 2001
From: Ari Roponen <ari.roponen@gmail.com>
Date: Fri, 27 Apr 2018 15:13:12 +0300
Subject: [PATCH 1/2] Fix cairo problems

* src/xterm.c (x_begin_cr_clip): Create image surface.
(x_update_end) [USE_CAIRO]: Remove GTK3-specific code.
(x_scroll_run) [USE_CAIRO]: Implement scrolling.
---
 src/xterm.c | 83 +++++++++++++++++++++++++++++------------------------
 1 file changed, 45 insertions(+), 38 deletions(-)

diff --git a/src/xterm.c b/src/xterm.c
index 6ab4a03002..2f3fe58c2a 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -360,17 +360,12 @@ x_begin_cr_clip (struct frame *f, GC gc)
 
       if (! FRAME_CR_SURFACE (f))
         {
-          cairo_surface_t *surface;
-          surface = cairo_xlib_surface_create (FRAME_X_DISPLAY (f),
-                                               FRAME_X_DRAWABLE (f),
-                                               FRAME_DISPLAY_INFO (f)->visual,
-                                               FRAME_PIXEL_WIDTH (f),
-                                               FRAME_PIXEL_HEIGHT (f));
-          cr = cairo_create (surface);
-          cairo_surface_destroy (surface);
-        }
-      else
-        cr = cairo_create (FRAME_CR_SURFACE (f));
+	  FRAME_CR_SURFACE (f) =
+	    cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
+					FRAME_PIXEL_WIDTH (f),
+					FRAME_PIXEL_HEIGHT (f));
+	}
+      cr = cairo_create (FRAME_CR_SURFACE (f));
       FRAME_CR_CONTEXT (f) = cr;
     }
   cairo_save (cr);
@@ -1232,40 +1227,31 @@ x_update_end (struct frame *f)
   MOUSE_HL_INFO (f)->mouse_face_defer = false;
 
 #ifdef USE_CAIRO
+  block_input();
+
   if (FRAME_CR_SURFACE (f))
     {
       cairo_t *cr = 0;
-      block_input();
-#if defined (USE_GTK) && defined (HAVE_GTK3)
-      if (FRAME_GTK_WIDGET (f))
-        {
-          GdkWindow *w = gtk_widget_get_window (FRAME_GTK_WIDGET (f));
-          cr = gdk_cairo_create (w);
-        }
-      else
-#endif
-        {
-          cairo_surface_t *surface;
-          int width = FRAME_PIXEL_WIDTH (f);
-          int height = FRAME_PIXEL_HEIGHT (f);
-          if (! FRAME_EXTERNAL_TOOL_BAR (f))
-            height += FRAME_TOOL_BAR_HEIGHT (f);
-          if (! FRAME_EXTERNAL_MENU_BAR (f))
-            height += FRAME_MENU_BAR_HEIGHT (f);
-          surface = cairo_xlib_surface_create (FRAME_X_DISPLAY (f),
-                                               FRAME_X_DRAWABLE (f),
-                                               FRAME_DISPLAY_INFO (f)->visual,
-                                               width,
-                                               height);
-          cr = cairo_create (surface);
-          cairo_surface_destroy (surface);
-        }
+      cairo_surface_t *surface;
+      int width = FRAME_PIXEL_WIDTH (f);
+      int height = FRAME_PIXEL_HEIGHT (f);
+      if (! FRAME_EXTERNAL_TOOL_BAR (f))
+	height += FRAME_TOOL_BAR_HEIGHT (f);
+      if (! FRAME_EXTERNAL_MENU_BAR (f))
+	height += FRAME_MENU_BAR_HEIGHT (f);
+      surface = cairo_xlib_surface_create (FRAME_X_DISPLAY (f),
+					   FRAME_X_DRAWABLE (f),
+					   FRAME_DISPLAY_INFO (f)->visual,
+					   width,
+					   height);
+      cr = cairo_create (surface);
+      cairo_surface_destroy (surface);
 
       cairo_set_source_surface (cr, FRAME_CR_SURFACE (f), 0, 0);
       cairo_paint (cr);
       cairo_destroy (cr);
-      unblock_input ();
     }
+  unblock_input ();
 #endif
 
 #ifndef XFlush
@@ -4271,7 +4257,28 @@ x_scroll_run (struct window *w, struct run *run)
   x_clear_cursor (w);
 
 #ifdef USE_CAIRO
-  SET_FRAME_GARBAGED (f);
+  if (FRAME_CR_CONTEXT (f))
+    {
+      cairo_surface_t *s = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
+						       width, height);
+      cairo_t *cr = cairo_create (s);
+      cairo_set_source_surface (cr, cairo_get_target (FRAME_CR_CONTEXT (f)),
+				-x, -from_y);
+      cairo_paint (cr);
+      cairo_destroy (cr);
+
+      cr = FRAME_CR_CONTEXT (f);
+      cairo_save (cr);
+      cairo_set_source_surface (cr, s, 0, to_y);
+      cairo_rectangle (cr, x, to_y, width, height);
+      cairo_fill (cr);
+      cairo_restore (cr);
+      cairo_surface_destroy (s);
+    }
+  else
+    {
+      SET_FRAME_GARBAGED (f);
+    }
 #else
   XCopyArea (FRAME_X_DISPLAY (f),
              FRAME_X_DRAWABLE (f), FRAME_X_DRAWABLE (f),
-- 
2.17.0

bug#31288: [PATCH v2] Make cairo build usable

[Ari Roponen]

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Hi,

attached are new versions of patches. This time, the cairo support for
imagemagick is better integrated into existing code.


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From d197ca49c2f0ff6b73e4410ba8e3414f3bbf2e1d Mon Sep 17 00:00:00 2001
From: Ari Roponen <ari.roponen@gmail.com>
Date: Fri, 27 Apr 2018 15:13:12 +0300
Subject: [PATCH 1/2] Fix cairo problems

* src/xterm.c (x_begin_cr_clip): Create image surface.
(x_update_end) [USE_CAIRO]: Remove GTK3-specific code.
(x_scroll_run) [USE_CAIRO]: Implement scrolling.
---
 src/xterm.c | 84 +++++++++++++++++++++++++++++------------------------
 1 file changed, 46 insertions(+), 38 deletions(-)

diff --git a/src/xterm.c b/src/xterm.c
index 6ab4a03002..35e10568fa 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -360,17 +360,12 @@ x_begin_cr_clip (struct frame *f, GC gc)
 
       if (! FRAME_CR_SURFACE (f))
         {
-          cairo_surface_t *surface;
-          surface = cairo_xlib_surface_create (FRAME_X_DISPLAY (f),
-                                               FRAME_X_DRAWABLE (f),
-                                               FRAME_DISPLAY_INFO (f)->visual,
-                                               FRAME_PIXEL_WIDTH (f),
-                                               FRAME_PIXEL_HEIGHT (f));
-          cr = cairo_create (surface);
-          cairo_surface_destroy (surface);
-        }
-      else
-        cr = cairo_create (FRAME_CR_SURFACE (f));
+	  FRAME_CR_SURFACE (f) =
+	    cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
+					FRAME_PIXEL_WIDTH (f),
+					FRAME_PIXEL_HEIGHT (f));
+	}
+      cr = cairo_create (FRAME_CR_SURFACE (f));
       FRAME_CR_CONTEXT (f) = cr;
     }
   cairo_save (cr);
@@ -1234,32 +1229,24 @@ x_update_end (struct frame *f)
 #ifdef USE_CAIRO
   if (FRAME_CR_SURFACE (f))
     {
-      cairo_t *cr = 0;
-      block_input();
-#if defined (USE_GTK) && defined (HAVE_GTK3)
-      if (FRAME_GTK_WIDGET (f))
-        {
-          GdkWindow *w = gtk_widget_get_window (FRAME_GTK_WIDGET (f));
-          cr = gdk_cairo_create (w);
-        }
-      else
-#endif
-        {
-          cairo_surface_t *surface;
-          int width = FRAME_PIXEL_WIDTH (f);
-          int height = FRAME_PIXEL_HEIGHT (f);
-          if (! FRAME_EXTERNAL_TOOL_BAR (f))
-            height += FRAME_TOOL_BAR_HEIGHT (f);
-          if (! FRAME_EXTERNAL_MENU_BAR (f))
-            height += FRAME_MENU_BAR_HEIGHT (f);
-          surface = cairo_xlib_surface_create (FRAME_X_DISPLAY (f),
-                                               FRAME_X_DRAWABLE (f),
-                                               FRAME_DISPLAY_INFO (f)->visual,
-                                               width,
-                                               height);
-          cr = cairo_create (surface);
-          cairo_surface_destroy (surface);
-        }
+      cairo_t *cr;
+      cairo_surface_t *surface;
+      int width, height;
+
+      block_input ();
+      width = FRAME_PIXEL_WIDTH (f);
+      height = FRAME_PIXEL_HEIGHT (f);
+      if (! FRAME_EXTERNAL_TOOL_BAR (f))
+	height += FRAME_TOOL_BAR_HEIGHT (f);
+      if (! FRAME_EXTERNAL_MENU_BAR (f))
+	height += FRAME_MENU_BAR_HEIGHT (f);
+      surface = cairo_xlib_surface_create (FRAME_X_DISPLAY (f),
+					   FRAME_X_DRAWABLE (f),
+					   FRAME_DISPLAY_INFO (f)->visual,
+					   width,
+					   height);
+      cr = cairo_create (surface);
+      cairo_surface_destroy (surface);
 
       cairo_set_source_surface (cr, FRAME_CR_SURFACE (f), 0, 0);
       cairo_paint (cr);
@@ -4271,7 +4258,28 @@ x_scroll_run (struct window *w, struct run *run)
   x_clear_cursor (w);
 
 #ifdef USE_CAIRO
-  SET_FRAME_GARBAGED (f);
+  if (FRAME_CR_CONTEXT (f))
+    {
+      cairo_surface_t *s = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
+						       width, height);
+      cairo_t *cr = cairo_create (s);
+      cairo_set_source_surface (cr, cairo_get_target (FRAME_CR_CONTEXT (f)),
+				-x, -from_y);
+      cairo_paint (cr);
+      cairo_destroy (cr);
+
+      cr = FRAME_CR_CONTEXT (f);
+      cairo_save (cr);
+      cairo_set_source_surface (cr, s, 0, to_y);
+      cairo_rectangle (cr, x, to_y, width, height);
+      cairo_fill (cr);
+      cairo_restore (cr);
+      cairo_surface_destroy (s);
+    }
+  else
+    {
+      SET_FRAME_GARBAGED (f);
+    }
 #else
   XCopyArea (FRAME_X_DISPLAY (f),
              FRAME_X_DRAWABLE (f), FRAME_X_DRAWABLE (f),
-- 
2.17.0


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[-- Attachment #3: 0002-Fix-image-support-for-cairo-builds.patch --]
[-- Type: text/x-patch, Size: 5793 bytes --]

From 3bcf9bb961bbe42ea02191ac22f3ed3bb681c771 Mon Sep 17 00:00:00 2001
From: Ari Roponen <ari.roponen@gmail.com>
Date: Fri, 27 Apr 2018 15:14:36 +0300
Subject: [PATCH 2/2] Fix image support for cairo builds

* src/image.c (lookup_rgb_color): Add cairo support.
(jpeg_load_body): Fix preprocessor symbol.  Move colors definition
into non-cairo part.
(imagemagick_load_image) [USE_CAIRO]: Add support for cairo.
---
 src/image.c | 41 +++++++++++++++++++++++++++++++++++++----
 1 file changed, 37 insertions(+), 4 deletions(-)

diff --git a/src/image.c b/src/image.c
index 37416c1616..4d5a1bf5e6 100644
--- a/src/image.c
+++ b/src/image.c
@@ -4629,6 +4629,8 @@ lookup_rgb_color (struct frame *f, int r, int g, int b)
   return PALETTERGB (r >> 8, g >> 8, b >> 8);
 #elif defined HAVE_NS
   return RGB_TO_ULONG (r >> 8, g >> 8, b >> 8);
+#elif defined USE_CAIRO
+  return (0xffu << 24) | (r << 16) | (g << 8) | b;
 #else
   xsignal1 (Qfile_error,
 	    build_string ("This Emacs mishandles this image file type"));
@@ -6702,10 +6704,10 @@ jpeg_load_body (struct frame *f, struct image *img,
   FILE *volatile fp = NULL;
   JSAMPARRAY buffer;
   int row_stride, x, y;
-  unsigned long *colors;
   int width, height;
   int i, ir, ig, ib;
 #ifndef USE_CAIRO
+  unsigned long *colors;
   XImagePtr ximg = NULL;
 #endif
 
@@ -6823,7 +6825,7 @@ jpeg_load_body (struct frame *f, struct image *img,
     else
       ir = 0, ig = 0, ib = 0;
 
-#ifndef CAIRO
+#ifndef USE_CAIRO
     /* Use the color table mechanism because it handles colors that
        cannot be allocated nicely.  Such colors will be replaced with
        a default color, and we don't have to care about which colors
@@ -8537,7 +8539,9 @@ imagemagick_load_image (struct frame *f, struct image *img,
   int width, height;
   size_t image_width, image_height;
   MagickBooleanType status;
+#ifndef USE_CAIRO
   XImagePtr ximg;
+#endif
   int x, y;
   MagickWand *image_wand;
   PixelIterator *iterator;
@@ -8551,6 +8555,9 @@ imagemagick_load_image (struct frame *f, struct image *img,
   double rotation;
   char hint_buffer[MaxTextExtent];
   char *filename_hint = NULL;
+#ifdef USE_CAIRO
+  void *data = NULL;
+#endif
 
   /* Initialize the ImageMagick environment.  */
   static bool imagemagick_initialized;
@@ -8759,6 +8766,12 @@ imagemagick_load_image (struct frame *f, struct image *img,
       /* Magicexportimage is normally faster than pixelpushing.  This
          method is also well tested.  Some aspects of this method are
          ad-hoc and needs to be more researched. */
+      void *dataptr;
+#ifdef USE_CAIRO
+      data = xmalloc (width * height * 4);
+      const char *exportdepth = "BGRA";
+      dataptr = data;
+#else
       int imagedepth = 24; /*MagickGetImageDepth(image_wand);*/
       const char *exportdepth = imagedepth <= 8 ? "I" : "BGRP"; /*"RGBP";*/
       /* Try to create a x pixmap to hold the imagemagick pixmap.  */
@@ -8771,6 +8784,8 @@ imagemagick_load_image (struct frame *f, struct image *img,
 	  image_error ("Imagemagick X bitmap allocation failure");
 	  goto imagemagick_error;
 	}
+      dataptr = ximg->data;
+#endif /* not USE_CAIRO */
 
       /* Oddly, the below code doesn't seem to work:*/
       /* switch(ximg->bitmap_unit){ */
@@ -8793,14 +8808,17 @@ imagemagick_load_image (struct frame *f, struct image *img,
       */
       int pixelwidth = CharPixel; /*??? TODO figure out*/
       MagickExportImagePixels (image_wand, 0, 0, width, height,
-			       exportdepth, pixelwidth, ximg->data);
+			       exportdepth, pixelwidth, dataptr);
     }
   else
 #endif /* HAVE_MAGICKEXPORTIMAGEPIXELS */
     {
       size_t image_height;
       MagickRealType color_scale = 65535.0 / QuantumRange;
-
+#ifdef USE_CAIRO
+      data = xmalloc (width * height * 4);
+      color_scale /= 256;
+#else
       /* Try to create a x pixmap to hold the imagemagick pixmap.  */
       if (!image_create_x_image_and_pixmap (f, img, width, height, 0,
 					    &ximg, 0))
@@ -8811,6 +8829,7 @@ imagemagick_load_image (struct frame *f, struct image *img,
           image_error ("Imagemagick X bitmap allocation failure");
           goto imagemagick_error;
         }
+#endif
 
       /* Copy imagemagick image to x with primitive yet robust pixel
          pusher loop.  This has been tested a lot with many different
@@ -8823,7 +8842,9 @@ imagemagick_load_image (struct frame *f, struct image *img,
 #ifdef COLOR_TABLE_SUPPORT
 	  free_color_table ();
 #endif
+#ifndef USE_CAIRO
 	  x_destroy_x_image (ximg);
+#endif
           image_error ("Imagemagick pixel iterator creation failed");
           goto imagemagick_error;
         }
@@ -8839,16 +8860,27 @@ imagemagick_load_image (struct frame *f, struct image *img,
 	  for (x = 0; x < xlim; x++)
             {
               PixelGetMagickColor (pixels[x], &pixel);
+#ifdef USE_CAIRO
+	      ((uint32_t *)data)[width * y + x] =
+		lookup_rgb_color (f,
+				  color_scale * pixel.red,
+				  color_scale * pixel.green,
+				  color_scale * pixel.blue);
+#else
               XPutPixel (ximg, x, y,
                          lookup_rgb_color (f,
 					   color_scale * pixel.red,
 					   color_scale * pixel.green,
 					   color_scale * pixel.blue));
+#endif
             }
         }
       DestroyPixelIterator (iterator);
     }
 
+#ifdef USE_CAIRO
+  create_cairo_image_surface (img, data, width, height);
+#else
 #ifdef COLOR_TABLE_SUPPORT
   /* Remember colors allocated for this image.  */
   img->colors = colors_in_color_table (&img->ncolors);
@@ -8860,6 +8892,7 @@ imagemagick_load_image (struct frame *f, struct image *img,
 
   /* Put ximg into the image.  */
   image_put_x_image (f, img, ximg, 0);
+#endif
 
   /* Final cleanup. image_wand should be the only resource left. */
   DestroyMagickWand (image_wand);
-- 
2.17.0

bug#31288: [PATCH v2] Make cairo build usable

[Eli Zaretskii]

> From: Ari Roponen <ari.roponen@gmail.com>
> Cc: Eli Zaretskii <eliz@gnu.org>
> Date: Sat, 28 Apr 2018 10:33:40 +0300
> 
> attached are new versions of patches. This time, the cairo support for
> imagemagick is better integrated into existing code.

Thanks, pushed to the master branch.

bug#31288: [PATCH v2] Make cairo build usable

[Ari Roponen]

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Eli Zaretskii <eliz@gnu.org> writes:

> Thanks, pushed to the master branch.

Thank you very much. However, I just noticed that my patch doesn't work
with side-by-side split windows. The following patch should fix that.


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[-- Attachment #2: 0001-Fix-cairo-scrolling-for-side-by-side-windows.patch --]
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From 788f0fc62881152b03043057fe98178d77a6bb3a Mon Sep 17 00:00:00 2001
From: Ari Roponen <ari.roponen@gmail.com>
Date: Sun, 6 May 2018 15:29:28 +0300
Subject: [PATCH] Fix cairo scrolling for side-by-side windows

* src/xterm.c (x_scroll_run) [USE_CAIRO]: Fix scrolling for
side-by-side split windows.
---
 src/xterm.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/xterm.c b/src/xterm.c
index 35e10568fa..3f956d950d 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -4260,6 +4260,7 @@ x_scroll_run (struct window *w, struct run *run)
 #ifdef USE_CAIRO
   if (FRAME_CR_CONTEXT (f))
     {
+      int wx = WINDOW_LEFT_EDGE_X (w);
       cairo_surface_t *s = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
 						       width, height);
       cairo_t *cr = cairo_create (s);
@@ -4270,8 +4271,8 @@ x_scroll_run (struct window *w, struct run *run)
 
       cr = FRAME_CR_CONTEXT (f);
       cairo_save (cr);
-      cairo_set_source_surface (cr, s, 0, to_y);
-      cairo_rectangle (cr, x, to_y, width, height);
+      cairo_set_source_surface (cr, s, wx, to_y);
+      cairo_rectangle (cr, wx, to_y, width, height);
       cairo_fill (cr);
       cairo_restore (cr);
       cairo_surface_destroy (s);
-- 
2.17.0

bug#31288: [PATCH v2] Make cairo build usable

[Eli Zaretskii]

> From: Ari Roponen <ari.roponen@gmail.com>
> Cc: 31288-done@debbugs.gnu.org
> Date: Sun, 06 May 2018 15:36:55 +0300
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Thanks, pushed to the master branch.
> 
> Thank you very much. However, I just noticed that my patch doesn't work
> with side-by-side split windows. The following patch should fix that.

Thanks, pushed.

Please in the future always mention the bug number in the commit
message, otherwise I need top "git commit --amend" after "git am", to
fix the commit message.

bug#31288: [PATCH v2] Make cairo build usable

[Ari Roponen]

YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp> writes:

> It causes display corruption when scroll bars are on the left.  I
> think the patch below will fix it.
>
> 				     YAMAMOTO Mitsuharu
> 				mituharu@math.s.chiba-u.ac.jp

Yes, I can see the corruption too, and your patch fixes it. Thank you.

bug#31288: [PATCH v2] Make cairo build usable

[YAMAMOTO Mitsuharu]

On Tue, 26 Mar 2019 15:13:58 +0900,
Ari Roponen wrote:
> 
> YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp> writes:
> 
> > It causes display corruption when scroll bars are on the left.  I
> > think the patch below will fix it.
> >
> > 				     YAMAMOTO Mitsuharu
> > 				mituharu@math.s.chiba-u.ac.jp
> 
> Yes, I can see the corruption too, and your patch fixes it. Thank you.

Thanks for checking.  I pushed the following to master.

				     YAMAMOTO Mitsuharu
				mituharu@math.s.chiba-u.ac.jp

commit 9a6cba2bd397414c68217f4f5a9ea2888293ae1c
Author: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>
Date:   Tue Mar 26 16:39:07 2019 +0900

    Fix cairo scrolling for left scroll bars case
    
    * src/xterm.c (x_scroll_run) [USE_CAIRO]: Fix scrolling by unusing
    WINDOW_LEFT_EDGE_X.  (Bug#31288)