From fd36eade0187a4efe0507b41fae22277300d1c7a Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= Date: Sun, 27 Sep 2020 18:57:47 +0400 Subject: [PATCH] edid: use physical dimensions if available MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Message-id: 20200927145751.365446-3-marcandre.lureau@redhat.com Signed-off-by: Gerd Hoffmann --- hw/display/edid-generate.c | 36 +++++++++++++++++++++++++----------- include/hw/display/edid.h | 5 ++++- qemu-edid.c | 11 +++++++++-- 3 files changed, 38 insertions(+), 14 deletions(-) diff --git a/hw/display/edid-generate.c b/hw/display/edid-generate.c index 618c74e1df..1665b7cbb2 100644 --- a/hw/display/edid-generate.c +++ b/hw/display/edid-generate.c @@ -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); diff --git a/include/hw/display/edid.h b/include/hw/display/edid.h index 5b1de57f24..1f8fc9b375 100644 --- a/include/hw/display/edid.h +++ b/include/hw/display/edid.h @@ -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), \ diff --git a/qemu-edid.c b/qemu-edid.c index 46eef70498..1db3372b98 100644 --- a/qemu-edid.c +++ b/qemu-edid.c @@ -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);