[PATCH 2/4] modesetting: Use a gbm buffer for shadow if we can

[Jason Ekstrand]

Signed-off-by: Jason Ekstrand <jason.ekstrand at intel.com>
---
 hw/xfree86/drivers/modesetting/driver.c          |  4 +--
 hw/xfree86/drivers/modesetting/drmmode_display.c | 43 +++++++++++++++---------
 hw/xfree86/drivers/modesetting/drmmode_display.h |  3 +-
 3 files changed, 31 insertions(+), 19 deletions(-)

diff --git a/hw/xfree86/drivers/modesetting/driver.c b/hw/xfree86/drivers/modesetting/driver.c
index 77da2cc..47ca382 100644
--- a/hw/xfree86/drivers/modesetting/driver.c
+++ b/hw/xfree86/drivers/modesetting/driver.c
@@ -897,8 +897,8 @@ CreateScreenResources(ScreenPtr pScreen)
 
     rootPixmap = pScreen->GetScreenPixmap(pScreen);
 
-    if (ms->drmmode.shadow_enable)
-        pixels = ms->drmmode.shadow_fb;
+    if (ms->drmmode.shadow_enable && !ms->drmmode.gbm)
+        pixels = drmmode_map_shadow_bo(&ms->drmmode);
 
     if (!pScreen->ModifyPixmapHeader(rootPixmap, -1, -1, -1, -1, -1, pixels))
         FatalError("Couldn't adjust screen pixmap\n");
diff --git a/hw/xfree86/drivers/modesetting/drmmode_display.c b/hw/xfree86/drivers/modesetting/drmmode_display.c
index 30ee79d..f4b0f1d 100644
--- a/hw/xfree86/drivers/modesetting/drmmode_display.c
+++ b/hw/xfree86/drivers/modesetting/drmmode_display.c
@@ -1168,7 +1168,7 @@ drmmode_xf86crtc_resize(ScrnInfoPtr scrn, int width, int height)
     drmmode_crtc_private_ptr
         drmmode_crtc = xf86_config->crtc[0]->driver_private;
     drmmode_ptr drmmode = drmmode_crtc->drmmode;
-    drmmode_bo old_front;
+    drmmode_bo old_front, old_shadow;
     Bool ret;
     ScreenPtr screen = xf86ScrnToScreen(scrn);
     uint32_t old_fb_id;
@@ -1193,6 +1193,7 @@ drmmode_xf86crtc_resize(ScrnInfoPtr scrn, int width, int height)
     old_pitch = drmmode_bo_get_pitch(&drmmode->front_bo);
     old_fb_id = drmmode->fb_id;
     old_front = drmmode->front_bo;
+    old_shadow = drmmode->shadow_bo;
 
     if (!drmmode_create_bo(drmmode, &drmmode->front_bo,
                            width, height, scrn->bitsPerPixel))
@@ -1218,13 +1219,9 @@ drmmode_xf86crtc_resize(ScrnInfoPtr scrn, int width, int height)
     }
 
     if (drmmode->shadow_enable) {
-        uint32_t size = scrn->displayWidth * scrn->virtualY *
-            ((scrn->bitsPerPixel + 7) >> 3);
-        new_pixels = calloc(1, size);
-        if (new_pixels == NULL)
+        if (!drmmode_create_bo(drmmode, &drmmode->shadow_bo,
+                               width, height, scrn->bitsPerPixel))
             goto fail;
-        free(drmmode->shadow_fb);
-        drmmode->shadow_fb = new_pixels;
     }
 
     screen->ModifyPixmapHeader(ppix, width, height, -1, -1, pitch, new_pixels);
@@ -1252,6 +1249,7 @@ drmmode_xf86crtc_resize(ScrnInfoPtr scrn, int width, int height)
  fail:
     drmmode_bo_destroy(drmmode, &drmmode->front_bo);
     drmmode->front_bo = old_front;
+    drmmode->shadow_bo = old_shadow;
     scrn->virtualX = old_width;
     scrn->virtualY = old_height;
     scrn->displayWidth = old_pitch / cpp;
@@ -1540,13 +1538,10 @@ drmmode_create_initial_bos(ScrnInfoPtr pScrn, drmmode_ptr drmmode)
         return FALSE;
     pScrn->displayWidth = drmmode_bo_get_pitch(&drmmode->front_bo) / cpp;
 
-    if (drmmode->shadow_enable) {
-        drmmode->shadow_fb =
-            calloc(1,
-                   pScrn->displayWidth * pScrn->virtualY *
-                   ((pScrn->bitsPerPixel + 7) >> 3));
-        if (!drmmode->shadow_fb)
-            drmmode->shadow_enable = FALSE;
+    if (drmmode->shadow_enable &&
+        !drmmode_create_bo(drmmode, &drmmode->shadow_bo, width, height, bpp)) {
+        drmmode_bo_destroy(drmmode, &drmmode->front_bo);
+        return FALSE;
     }
 
     width = ms->cursor_width;
@@ -1579,6 +1574,22 @@ drmmode_map_front_bo(drmmode_ptr drmmode)
 }
 
 void *
+drmmode_map_shadow_bo(drmmode_ptr drmmode)
+{
+    int ret;
+
+    if (drmmode->shadow_bo.dumb->ptr)
+        return drmmode->shadow_bo.dumb->ptr;
+
+    ret = dumb_bo_map(drmmode->fd, drmmode->shadow_bo.dumb);
+    if (ret)
+        return NULL;
+
+    return drmmode->shadow_bo.dumb->ptr;
+
+}
+
+void *
 drmmode_map_slave_bo(drmmode_ptr drmmode, msPixmapPrivPtr ppriv)
 {
     int ret;
@@ -1624,8 +1635,8 @@ drmmode_free_bos(ScreenPtr pScreen, drmmode_ptr drmmode)
 
     if (drmmode->shadow_enable) {
         shadowRemove(pScreen, pScreen->GetScreenPixmap(pScreen));
-        free(drmmode->shadow_fb);
-        drmmode->shadow_fb = NULL;
+        drmmode_bo_destroy(drmmode, &drmmode->shadow_bo);
+        drmmode->shadow_enable = FALSE;
     }
 
     drmmode_bo_destroy(drmmode, &drmmode->front_bo);
diff --git a/hw/xfree86/drivers/modesetting/drmmode_display.h b/hw/xfree86/drivers/modesetting/drmmode_display.h
index c67809b..0e6560e 100644
--- a/hw/xfree86/drivers/modesetting/drmmode_display.h
+++ b/hw/xfree86/drivers/modesetting/drmmode_display.h
@@ -64,7 +64,7 @@ typedef struct {
 
     Bool glamor;
     Bool shadow_enable;
-    void *shadow_fb;
+    drmmode_bo shadow_bo;
 
     /**
      * A screen-sized pixmap when we're doing triple-buffered DRI2
@@ -154,6 +154,7 @@ extern void drmmode_uevent_fini(ScrnInfoPtr scrn, drmmode_ptr drmmode);
 
 Bool drmmode_create_initial_bos(ScrnInfoPtr pScrn, drmmode_ptr drmmode);
 void *drmmode_map_front_bo(drmmode_ptr drmmode);
+void *drmmode_map_shadow_bo(drmmode_ptr drmmode);
 Bool drmmode_map_cursor_bos(ScrnInfoPtr pScrn, drmmode_ptr drmmode);
 void drmmode_free_bos(ScreenPtr pScreen, drmmode_ptr drmmode);
 void drmmode_get_default_bpp(ScrnInfoPtr pScrn, drmmode_ptr drmmmode,
-- 
2.2.0