x.c: add w3m support for images

2 files changed, 44 insertions, 0 deletions

diff --git a/patches/st-w3m-0.8.3.diff b/patches/st-w3m-0.8.3.diff
new file mode 100644
index 0000000..a4e104b
--- /dev/null
+++ b/patches/st-w3m-0.8.3.diff
@@ -0,0 +1,42 @@
+From 69cffc587b54b0a9cd81adb87abad8e526d5b25b Mon Sep 17 00:00:00 2001
+From: "Avi Halachmi (:avih)" <avihpit@yahoo.com>
+Date: Thu, 4 Jun 2020 17:35:08 +0300
+Subject: [PATCH] support w3m images
+
+w3m images are a hack which renders on top of the terminal's drawable,
+which didn't work in st because when using double buffering, the front
+buffer (on which w3m draws its images) is ignored, and st draws only
+on the back buffer, which is then copied to the front buffer.
+
+There's a patch to make it work at the FAQ already, but that patch
+canceles double-buffering, which can have negative side effects on
+some cases such as flickering.
+
+This patch achieves the same goal but instead of canceling the double
+buffer it first copies the front buffer to the back buffer.
+
+This has the same issues as the FAQ patch in that the cursor line is
+deleted at the image (because st renders always full lines), but
+otherwise it's simpler and does keeps double buffering.
+---
+ x.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/x.c b/x.c
+index e5f1737..b6ae162 100644
+--- a/x.c
++++ b/x.c
+@@ -1594,6 +1594,8 @@ xsettitle(char *p)
+ int
+ xstartdraw(void)
+ {
++	if (IS_SET(MODE_VISIBLE))
++		XCopyArea(xw.dpy, xw.win, xw.buf, dc.gc, 0, 0, win.w, win.h, 0, 0);
+ 	return IS_SET(MODE_VISIBLE);
+ }
+ 
+
+base-commit: 43a395ae91f7d67ce694e65edeaa7bbc720dd027
+-- 
+2.17.1
+
diff --git a/x.c b/x.c
index 89786b8..ea8b8f2 100644
--- a/x.c
+++ b/x.c
@@ -1613,6 +1613,8 @@ xsettitle(char *p)
 int
 xstartdraw(void)
 {
+	if (IS_SET(MODE_VISIBLE))
+		XCopyArea(xw.dpy, xw.win, xw.buf, dc.gc, 0, 0, win.w, win.h, 0, 0);
 	return IS_SET(MODE_VISIBLE);
 }