Intravision/reactos
1
0
Fork 0
mirror of https://github.com/reactos/reactos.git synced 2024-07-05 12:15:46 +00:00
Code Issues Packages Projects Releases Wiki Activity

[VBEMP]

Browse source 
Fix rounding error when calculating display size
Loosely based on patch by neoman.
Fixes gdi32_winetest:mapping

See issue #5790 for more details.

svn path=/trunk/; revision=50112
This commit is contained in:
Timo Kreuzer 2010-12-23 12:11:19 +00:00
parent 7ea8c55b57
commit ac56cac80c
1 changed files with 5 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
reactos/drivers/video/miniport/vbe/vbemp.c
View file

@ -847,6 +847,7 @@ VBEQueryMode(
ULONG VideoModeId)
{
PVBE_MODEINFO VBEMode = &DeviceExtension->ModeInfo[VideoModeId];
ULONG dpi;
VideoMode->Length = sizeof(VIDEO_MODE_INFORMATION);
VideoMode->ModeIndex = VideoModeId;
@ -860,9 +861,10 @@ VBEQueryMode(
VideoMode->BitsPerPlane = VBEMode->BitsPerPixel / VBEMode->NumberOfPlanes;
VideoMode->Frequency = 1;
/* Assume 96DPI and 25.4 millimeters per inch */
VideoMode->XMillimeter = VBEMode->XResolution * 254 / 960;
VideoMode->YMillimeter = VBEMode->YResolution * 254 / 960;
/* Assume 96DPI and 25.4 millimeters per inch, round to nearest */
dpi = 96;
VideoMode->XMillimeter = ((ULONGLONG)VBEMode->XResolution * 254 + (dpi * 5)) / (dpi * 10);
VideoMode->YMillimeter = ((ULONGLONG)VBEMode->YResolution * 254 + (dpi * 5)) / (dpi * 10);
if (VBEMode->BitsPerPixel > 8)
{