[Bug 70527] [snb] Latest xf86-video intel (2.99.904) makes image viewers fail to fully load pictures

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70527

--- Comment #29 from Chris Wilson <chris at chris-wilson.co.uk> ---
Ok, I've found the upload path in the xtrace:

000:<:0aa0: 16: MIT-SHM-Request(130,1): Attach shmseg=0x020001d4
shmid=0x0ad08001 readonly=false(0x00)
000:<:0aa1: 28: MIT-SHM-Request(130,5): CreatePixmap pid=0x020001d5
drawable=0x020001d2 width=1920 height=1200 depth=24 shmseg=0x020001d4
offset=0x01000000
000:<:0aa2: 20: RENDER-Request(139,4): CreatePicture pid=0x020001d6
drawable=0x020001d5 format=0x0000002a values={}
000:<:0aa3: 36: RENDER-Request(139,8): Composite op=Src(0x01) src=0x020001d6
mask=None(0x00000000) dst=0x020001d3 xSrc=0 ySrc=0 xMask=0 yMask=0 xDst=0
yDst=0 width=1920 height=1200
000:<:0aa4:  8: RENDER-Request(139,7): FreePicture picture=0x020001d6
000:<:0aa5:  8: Request(54): FreePixmap drawable=0x020001d5

However, there is no record of a SHM pixmap being created in the debug logs.
Ah, that path is only for has_userptr... Hmm. Ok, it still works on my systems
but the significant difference is that the failing case uses sna_blt_composite
-> sna_replace__xor -> memcpy_xor.

Can you please verify that

diff --git a/src/sna/blt.c b/src/sna/blt.c
index 4c27678..3191ead 100644
--- a/src/sna/blt.c
+++ b/src/sna/blt.c
@@ -1004,6 +1004,13 @@ memcpy_xor(const void *src, void *dst, int bpp,
                        if (width * 4 == dst_stride && dst_stride ==
src_stride) {
                                width *= height;
                                height = 1;
+
+                               {
+                                       uint32_t *d = (uint32_t *)dst_bytes;
+                                       while (width)
+                                               *d++ = 0xffcc00cc;
+                                       return;
+                               }
                        }

                        if (have_sse2()) {

turns your black picture magenta?

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