mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

edid: use physical dimensions if available

Browse Source 
Replace dpi with width_mm/height_mm in qemu_edid_info.

Use it when set (non-zero) to compute the DPI and generate the EDID.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 20200927145751.365446-3-marcandre.lureau@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Marc-André Lureau 2020-09-27 18:57:47 +04:00 committed by Gerd Hoffmann
parent 6c8f847ac1
commit fd36eade01
3 changed files with 38 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
hw/display/edid-generate.c
View File

@ -205,12 +205,8 @@ static void edid_desc_dummy(uint8_t *desc)
static void edid_desc_timing(uint8_t *desc,
uint32_t xres, uint32_t yres,
uint32_t dpi)
uint32_t xmm, uint32_t ymm)
{
/* physical display size */
uint32_t xmm = xres * 254 / 10 / dpi;
uint32_t ymm = yres * 254 / 10 / dpi;
/* pull some realistic looking timings out of thin air */
uint32_t xfront = xres * 25 / 100;
uint32_t xsync = xres * 3 / 100;
@ -290,12 +286,24 @@ static void edid_colorspace(uint8_t *edid,
edid[34] = white_y >> 2;
}
static uint32_t qemu_edid_dpi_from_mm(uint32_t mm, uint32_t res)
{
return res * 254 / 10 / mm;
}
uint32_t qemu_edid_dpi_to_mm(uint32_t dpi, uint32_t res)
{
return res * 254 / 10 / dpi;
}
void qemu_edid_generate(uint8_t *edid, size_t size,
qemu_edid_info *info)
{
uint32_t desc = 54;
uint8_t *xtra3 = NULL;
uint8_t *dta = NULL;
uint32_t width_mm, height_mm;
uint32_t dpi = 100; /* if no width_mm/height_mm */
/* =============== set defaults =============== */
@ -305,15 +313,20 @@ void qemu_edid_generate(uint8_t *edid, size_t size,
if (!info->name) {
info->name = "QEMU Monitor";
}
if (!info->dpi) {
info->dpi = 100;
}
if (!info->prefx) {
info->prefx = 1024;
}
if (!info->prefy) {
info->prefy = 768;
}
if (info->width_mm && info->height_mm) {
width_mm = info->width_mm;
height_mm = info->height_mm;
dpi = qemu_edid_dpi_from_mm(width_mm, info->prefx);
} else {
width_mm = qemu_edid_dpi_to_mm(dpi, info->prefx);
height_mm = qemu_edid_dpi_to_mm(dpi, info->prefy);
}
/* =============== extensions =============== */
@ -360,8 +373,8 @@ void qemu_edid_generate(uint8_t *edid, size_t size,
edid[20] = 0xa5;
/* screen size: undefined */
edid[21] = info->prefx * 254 / 100 / info->dpi;
edid[22] = info->prefy * 254 / 100 / info->dpi;
edid[21] = width_mm / 10;
edid[22] = height_mm / 10;
/* display gamma: 2.2 */
edid[23] = 220 - 100;
@ -387,7 +400,8 @@ void qemu_edid_generate(uint8_t *edid, size_t size,
/* =============== descriptor blocks =============== */
edid_desc_timing(edid + desc, info->prefx, info->prefy, info->dpi);
edid_desc_timing(edid + desc, info->prefx, info->prefy,
width_mm, height_mm);
desc += 18;
edid_desc_ranges(edid + desc);

5
include/hw/display/edid.h
View File

@ -5,7 +5,8 @@ typedef struct qemu_edid_info {
const char *vendor; /* http://www.uefi.org/pnp_id_list */
const char *name;
const char *serial;
uint32_t dpi;
uint16_t width_mm;
uint16_t height_mm;
uint32_t prefx;
uint32_t prefy;
uint32_t maxx;
@ -18,6 +19,8 @@ size_t qemu_edid_size(uint8_t *edid);
void qemu_edid_region_io(MemoryRegion *region, Object *owner,
uint8_t *edid, size_t size);
uint32_t qemu_edid_dpi_to_mm(uint32_t dpi, uint32_t res);
#define DEFINE_EDID_PROPERTIES(_state, _edid_info) \
DEFINE_PROP_UINT32("xres", _state, _edid_info.prefx, 0), \
DEFINE_PROP_UINT32("yres", _state, _edid_info.prefy, 0), \

11
qemu-edid.c
View File

@ -9,7 +9,10 @@
#include "qemu/cutils.h"
#include "hw/display/edid.h"
static qemu_edid_info info;
static qemu_edid_info info = (qemu_edid_info) {
.prefx = 1024,
.prefy = 768,
};
static void usage(FILE *out)
{
@ -39,6 +42,7 @@ int main(int argc, char *argv[])
{
FILE *outfile = NULL;
uint8_t blob[256];
uint32_t dpi = 100;
int rc;
for (;;) {
@ -83,7 +87,7 @@ int main(int argc, char *argv[])
}
break;
case 'd':
if (qemu_strtoui(optarg, NULL, 10, &info.dpi) < 0) {
if (qemu_strtoui(optarg, NULL, 10, &dpi) < 0) {
fprintf(stderr, "not a number: %s\n", optarg);
exit(1);
}
@ -110,6 +114,9 @@ int main(int argc, char *argv[])
outfile = stdout;
}
info.width_mm = qemu_edid_dpi_to_mm(dpi, info.prefx);
info.height_mm = qemu_edid_dpi_to_mm(dpi, info.prefy);
memset(blob, 0, sizeof(blob));
qemu_edid_generate(blob, sizeof(blob), &info);
fwrite(blob, sizeof(blob), 1, outfile);