qxl: remove flipped

Tested on linux and windows guests. For negative stride, qxl_flip copies
directly to vga->ds->surface->data, for positive it's reallocated to
share qxl->guest_primary.data

Signed-off-by: Alon Levy <alevy@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

hw/qxl-render.c

@@ -23,10 +23,21 @@
 
 static void qxl_flip(PCIQXLDevice *qxl, QXLRect *rect)
 {
-    uint8_t *src = qxl->guest_primary.data;
-    uint8_t *dst = qxl->guest_primary.flipped;
+    uint8_t *src;
+    uint8_t *dst = qxl->vga.ds->surface->data;
     int len, i;
 
+    if (qxl->guest_primary.qxl_stride > 0) {
+        return;
+    }
+    if (!qxl->guest_primary.data) {
+        dprint(qxl, 1, "%s: initializing guest_primary.data\n", __func__);
+        qxl->guest_primary.data = memory_region_get_ram_ptr(&qxl->vga.vram);
+    }
+    dprint(qxl, 1, "%s: stride %d, [%d, %d, %d, %d]\n", __func__,
+            qxl->guest_primary.qxl_stride,
+            rect->left, rect->right, rect->top, rect->bottom);
+    src = qxl->guest_primary.data;
     src += (qxl->guest_primary.surface.height - rect->top - 1) *
         qxl->guest_primary.abs_stride;
     dst += rect->top  * qxl->guest_primary.abs_stride;
@@ -75,52 +86,38 @@ void qxl_render_update(PCIQXLDevice *qxl)
 {
     VGACommonState *vga = &qxl->vga;
     QXLRect dirty[32], update;
-    void *ptr;
     int i, redraw = 0;
-
-    if (!is_buffer_shared(vga->ds->surface)) {
-        dprint(qxl, 1, "%s: restoring shared displaysurface\n", __func__);
-        qxl->guest_primary.resized++;
-        qxl->guest_primary.commands++;
-        redraw = 1;
-    }
+    DisplaySurface *surface = vga->ds->surface;
 
     if (qxl->guest_primary.resized) {
         qxl->guest_primary.resized = 0;
 
-        if (qxl->guest_primary.flipped) {
-            g_free(qxl->guest_primary.flipped);
-            qxl->guest_primary.flipped = NULL;
-        }
-        qemu_free_displaysurface(vga->ds);
-
         qxl->guest_primary.data = memory_region_get_ram_ptr(&qxl->vga.vram);
-        if (qxl->guest_primary.qxl_stride < 0) {
-            /* spice surface is upside down -> need extra buffer to flip */
-            qxl->guest_primary.flipped =
-                g_malloc(qxl->guest_primary.surface.width *
-                         qxl->guest_primary.abs_stride);
-            ptr = qxl->guest_primary.flipped;
-        } else {
-            ptr = qxl->guest_primary.data;
-        }
-        dprint(qxl, 1, "%s: %dx%d, stride %d, bpp %d, depth %d, flip %s\n",
+        dprint(qxl, 1, "%s: %dx%d, stride %d, bpp %d, depth %d\n",
                __FUNCTION__,
                qxl->guest_primary.surface.width,
                qxl->guest_primary.surface.height,
                qxl->guest_primary.qxl_stride,
                qxl->guest_primary.bytes_pp,
-               qxl->guest_primary.bits_pp,
-               qxl->guest_primary.flipped ? "yes" : "no");
-        vga->ds->surface =
+               qxl->guest_primary.bits_pp);
+    }
+    if (surface->width != qxl->guest_primary.surface.width ||
+        surface->height != qxl->guest_primary.surface.height) {
+        dprint(qxl, 1, "%s: resizing displaysurface to guest_primary\n",
+               __func__);
+        if (qxl->guest_primary.qxl_stride > 0) {
+            qemu_free_displaysurface(vga->ds);
             qemu_create_displaysurface_from(qxl->guest_primary.surface.width,
                                             qxl->guest_primary.surface.height,
                                             qxl->guest_primary.bits_pp,
                                             qxl->guest_primary.abs_stride,
-                                            ptr);
-        dpy_resize(vga->ds);
+                                            qxl->guest_primary.data);
+        } else {
+            qemu_resize_displaysurface(vga->ds,
+                    qxl->guest_primary.surface.width,
+                    qxl->guest_primary.surface.height);
+        }
     }
-
     update.left   = 0;
     update.right  = qxl->guest_primary.surface.width;
     update.top    = 0;
@@ -136,14 +133,11 @@ void qxl_render_update(PCIQXLDevice *qxl)
         memset(dirty, 0, sizeof(dirty));
         dirty[0] = update;
     }
-
     for (i = 0; i < ARRAY_SIZE(dirty); i++) {
         if (qemu_spice_rect_is_empty(dirty+i)) {
             break;
         }
-        if (qxl->guest_primary.flipped) {
-            qxl_flip(qxl, dirty+i);
-        }
+        qxl_flip(qxl, dirty+i);
         dpy_update(vga->ds,
                    dirty[i].left, dirty[i].top,
                    dirty[i].right - dirty[i].left,

hw/qxl.h

@@ -52,7 +52,7 @@ typedef struct PCIQXLDevice {
         uint32_t       abs_stride;
         uint32_t       bits_pp;
         uint32_t       bytes_pp;
-        uint8_t        *data, *flipped;
+        uint8_t        *data;
     } guest_primary;
 
     struct surfaces {