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qxl: stride fixup

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spice uses negative stride value to signal the bitmap is upside down.
The qxl renderer (used for scl, vnc and screenshots) wants a positive
value because it is easier to work with.  The positive value is then
stored in the very same variable, which has the drawback that the
upside-down test works only once.  Fix by using two variables.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2011-10-21 15:59:07 +02:00
parent ff74c5a9a9
commit 0e2487bd6f
2 changed files with 14 additions and 12 deletions
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23
hw/qxl-render.c
View File

@ -28,16 +28,16 @@ static void qxl_flip(PCIQXLDevice *qxl, QXLRect *rect)
int len, i;
src += (qxl->guest_primary.surface.height - rect->top - 1) *
qxl->guest_primary.stride;
dst += rect->top * qxl->guest_primary.stride;
qxl->guest_primary.abs_stride;
dst += rect->top * qxl->guest_primary.abs_stride;
src += rect->left * qxl->guest_primary.bytes_pp;
dst += rect->left * qxl->guest_primary.bytes_pp;
len = (rect->right - rect->left) * qxl->guest_primary.bytes_pp;
for (i = rect->top; i < rect->bottom; i++) {
memcpy(dst, src, len);
dst += qxl->guest_primary.stride;
src -= qxl->guest_primary.stride;
dst += qxl->guest_primary.abs_stride;
src -= qxl->guest_primary.abs_stride;
}
}
@ -45,7 +45,8 @@ void qxl_render_resize(PCIQXLDevice *qxl)
{
QXLSurfaceCreate *sc = &qxl->guest_primary.surface;
qxl->guest_primary.stride = sc->stride;
qxl->guest_primary.qxl_stride = sc->stride;
qxl->guest_primary.abs_stride = abs(sc->stride);
qxl->guest_primary.resized++;
switch (sc->format) {
case SPICE_SURFACE_FMT_16_555:
@ -87,11 +88,11 @@ void qxl_render_update(PCIQXLDevice *qxl)
qemu_free_displaysurface(vga->ds);
qxl->guest_primary.data = memory_region_get_ram_ptr(&qxl->vga.vram);
if (qxl->guest_primary.stride < 0) {
if (qxl->guest_primary.qxl_stride < 0) {
/* spice surface is upside down -> need extra buffer to flip */
qxl->guest_primary.stride = -qxl->guest_primary.stride;
qxl->guest_primary.flipped = g_malloc(qxl->guest_primary.surface.width *
qxl->guest_primary.stride);
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;
@ -100,7 +101,7 @@ void qxl_render_update(PCIQXLDevice *qxl)
__FUNCTION__,
qxl->guest_primary.surface.width,
qxl->guest_primary.surface.height,
qxl->guest_primary.stride,
qxl->guest_primary.qxl_stride,
qxl->guest_primary.bytes_pp,
qxl->guest_primary.bits_pp,
qxl->guest_primary.flipped ? "yes" : "no");
@ -108,7 +109,7 @@ void qxl_render_update(PCIQXLDevice *qxl)
qemu_create_displaysurface_from(qxl->guest_primary.surface.width,
qxl->guest_primary.surface.height,
qxl->guest_primary.bits_pp,
qxl->guest_primary.stride,
qxl->guest_primary.abs_stride,
ptr);
dpy_resize(vga->ds);
}

3
hw/qxl.h
View File

@ -48,7 +48,8 @@ typedef struct PCIQXLDevice {
QXLSurfaceCreate surface;
uint32_t commands;
uint32_t resized;
int32_t stride;
int32_t qxl_stride;
uint32_t abs_stride;
uint32_t bits_pp;
uint32_t bytes_pp;
uint8_t *data, *flipped;