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bug#31288: 27.0.50; [PATCH] Make cairo build somewhat usable
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From: |
Ari Roponen |
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Subject: |
bug#31288: 27.0.50; [PATCH] Make cairo build somewhat usable |
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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.
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)
>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
>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