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fix endianness problem sharing the videoram buffer 

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This patch fixes vga rendering when the guest endianness differs from
the host endianness: in this case we can only share the buffer if the
bpp is 32 and we must change the pixelformat accordingly.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6413 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
malc 2009-01-23 19:56:19 +00:00
parent 1a6f0dbcc0
commit 0da2ea1b37
3 changed files with 63 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

66
console.c
View File

@ -1449,7 +1449,7 @@ void qemu_console_copy(DisplayState *ds, int src_x, int src_y,
}
}
static PixelFormat qemu_default_pixelformat(int bpp)
PixelFormat qemu_different_endianness_pixelformat(int bpp)
{
PixelFormat pf;
@ -1460,17 +1460,48 @@ static PixelFormat qemu_default_pixelformat(int bpp)
pf.depth = bpp == 32 ? 24 : bpp;
switch (bpp) {
case 8:
pf.rmask = 0x000000E0;
pf.gmask = 0x0000001C;
pf.bmask = 0x00000003;
pf.rmax = 7;
pf.gmax = 7;
pf.bmax = 3;
pf.rshift = 5;
pf.gshift = 2;
pf.bshift = 0;
case 24:
pf.rmask = 0x000000FF;
pf.gmask = 0x0000FF00;
pf.bmask = 0x00FF0000;
pf.rmax = 255;
pf.gmax = 255;
pf.bmax = 255;
pf.rshift = 0;
pf.gshift = 8;
pf.bshift = 16;
break;
case 32:
pf.rmask = 0x0000FF00;
pf.gmask = 0x00FF0000;
pf.bmask = 0xFF000000;
pf.amask = 0x00000000;
pf.amax = 255;
pf.rmax = 255;
pf.gmax = 255;
pf.bmax = 255;
pf.ashift = 0;
pf.rshift = 8;
pf.gshift = 16;
pf.bshift = 24;
break;
default:
break;
}
return pf;
}
PixelFormat qemu_default_pixelformat(int bpp)
{
PixelFormat pf;
memset(&pf, 0x00, sizeof(PixelFormat));
pf.bits_per_pixel = bpp;
pf.bytes_per_pixel = bpp / 8;
pf.depth = bpp == 32 ? 24 : bpp;
switch (bpp) {
case 16:
pf.rmask = 0x0000F800;
pf.gmask = 0x000007E0;
@ -1483,7 +1514,6 @@ static PixelFormat qemu_default_pixelformat(int bpp)
pf.bshift = 0;
break;
case 24:
case 32:
pf.rmask = 0x00FF0000;
pf.gmask = 0x0000FF00;
pf.bmask = 0x000000FF;
@ -1493,6 +1523,18 @@ static PixelFormat qemu_default_pixelformat(int bpp)
pf.rshift = 16;
pf.gshift = 8;
pf.bshift = 0;
case 32:
pf.rmask = 0x00FF0000;
pf.gmask = 0x0000FF00;
pf.bmask = 0x000000FF;
pf.amax = 255;
pf.rmax = 255;
pf.gmax = 255;
pf.bmax = 255;
pf.ashift = 24;
pf.rshift = 16;
pf.gshift = 8;
pf.bshift = 0;
break;
default:
break;

2
console.h
View File

@ -134,6 +134,8 @@ DisplaySurface* qemu_resize_displaysurface(DisplaySurface *surface,
DisplaySurface* qemu_create_displaysurface_from(int width, int height, int bpp,
int linesize, uint8_t *data);
void qemu_free_displaysurface(DisplaySurface *surface);
PixelFormat qemu_different_endianness_pixelformat(int bpp);
PixelFormat qemu_default_pixelformat(int bpp);
static inline int is_buffer_shared(DisplaySurface *surface)
{

7
hw/vga.c
View File

@ -1623,12 +1623,19 @@ static void vga_draw_graphic(VGAState *s, int full_update)
disp_width != s->last_width ||
height != s->last_height ||
s->last_depth != depth) {
#if defined(WORDS_BIGENDIAN) == defined(TARGET_WORDS_BIGENDIAN)
if (depth == 16 || depth == 32) {
#else
if (depth == 32) {
#endif
if (is_graphic_console()) {
qemu_free_displaysurface(s->ds->surface);
s->ds->surface = qemu_create_displaysurface_from(disp_width, height, depth,
s->line_offset,
s->vram_ptr + (s->start_addr * 4));
#if defined(WORDS_BIGENDIAN) != defined(TARGET_WORDS_BIGENDIAN)
s->ds->surface->pf = qemu_different_endianness_pixelformat(depth);
#endif
dpy_resize(s->ds);
} else {
qemu_console_resize(s->ds, disp_width, height);