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terminal: fix back-buffer selection on DRM page-flip

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We currently select front-buffers as new back-buffer if they happen to be
the last buffer in our framebuffer-array. Fix this by never selecting a
new front buffer as back buffer.
This commit is contained in:
David Herrmann 2014-10-02 13:11:53 +02:00
parent 754fc0c720
commit db1a606610
1 changed files with 3 additions and 4 deletions
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7
src/libsystemd-terminal/grdev-drm.c
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@ -1362,10 +1362,9 @@ static void grdrm_crtc_flip_complete(grdrm_crtc *crtc, uint32_t counter, struct
fb = fb_from_base(pipe->base.fbs[i]);
if (counter != 0 && counter == pipe->counter && fb->flipid == counter) {
pipe->base.front = &fb->base;
fb->flipid = 0;
flipped = true;
}
if (counter - fb->flipid < UINT16_MAX) {
} else if (counter - fb->flipid < UINT16_MAX) {
fb->flipid = 0;
back = fb;
} else if (fb->flipid == 0) {
@ -1373,7 +1372,7 @@ static void grdrm_crtc_flip_complete(grdrm_crtc *crtc, uint32_t counter, struct
}
}
if (!pipe->base.back)
if (!pipe->base.back && back)
pipe->base.back = &back->base;
if (flipped) {