[M3devel] pixmap problem

[Randy Coleburn]

Jay, I ran your program on a Lenovo/IBM ThinkPad T60 running at 1280x1024 resolution.  Here are the results:
 
horizonal pixels 1280
veritical pixels SM_CYSCREEN 1024
horizontal millimeters 375
veritical millimeters 300
horizontal pixels per millimeter 3.413333
vertical pixels per millimeter 3.413333
horizontal pixels per inch 86.698667
vertical pixels per inch 86.698667
 
I tried to run this program on the Dell M4300 system at 1920x1200, but I'm running into some stupid Microsoft problem.  I installed the VC_Redist, but it still doesn't work on this system.  Not sure what is wrong yet.
 
Regards,
Randy

>>> Jay <jayk123 at hotmail.com> 8/5/2008 9:01 AM >>>


Randy, I'm pretty clueless here.
I don't do gui or graphics.
If anyone has a clue, please stand up.
If you can get us code to run, please do.
But I think I need multiple particularly configured machines too.

I'm curious what this code prints on the systems:

#include
#include

int main()
{
int pix_ver = { 0 };
int pix_hor = { 0 };
int mm_hor = { 0 };
int mm_ver = { 0 };
HWND hwnd = { 0 };
HDC hdc = { 0 };

hwnd = GetDesktopWindow();
hdc = GetDC(hwnd);
mm_hor = GetDeviceCaps(hdc, HORZSIZE);
mm_ver = GetDeviceCaps(hdc, VERTSIZE);
pix_hor = GetSystemMetrics(SM_CXSCREEN);
pix_ver = GetSystemMetrics(SM_CYSCREEN);

printf("horizonal pixels %d\n", pix_hor);
printf("veritical pixels SM_CYSCREEN %d\n", pix_ver);
printf("horizontal millimeters %d\n", mm_hor);
printf("veritical millimeters %d\n", mm_ver);

printf("horizontal pixels per millimeter %f\n", (((float) pix_hor) / ((float) mm_hor)));
printf("vertical pixels per millimeter %f\n", (((float) pix_ver) / ((float) mm_ver)));

printf("horizontal pixels per inch %f\n", (((float) pix_hor) / ((float) mm_hor) * 10.0 * 2.54));
printf("vertical pixels per inch %f\n", (((float) pix_ver) / ((float) mm_ver) * 10.0 * 2.54));

return 0;
}


for me:

$ gcc dpi.c -luser32 -lgdi32

jay at jay-win9 /dev2/j/dpi
$ ./a
horizonal pixels 1280
veritical pixels SM_CYSCREEN 800
horizontal millimeters 384
veritical millimeters 240
horizontal pixels per millimeter 3.333333
vertical pixels per millimeter 3.333333
horizontal pixels per inch 84.666667
vertical pixels per inch 84.666667

(Visual C++ is fine:
cl dpi.c user32.lib gdi32.lib
.\dpi
)

I wonder if lying in this code:

Searching for 'GetDeviceCaps'...
D:\dev2\cm3.2\m3-ui\ui\src\winvbt\WinScreenType.m3(25): VAR res := NEW(T); n_colors := GetDeviceCaps (WinGDI.NUMCOLORS);
D:\dev2\cm3.2\m3-ui\ui\src\winvbt\WinScreenType.m3(32): res.depth := GetDeviceCaps(WinGDI.BITSPIXEL); (* John Karnak 8/3/98 *)
D:\dev2\cm3.2\m3-ui\ui\src\winvbt\WinScreenType.m3(68): mm_hor = GetDeviceCaps (WinGDI.HORZSIZE),
D:\dev2\cm3.2\m3-ui\ui\src\winvbt\WinScreenType.m3(69): mm_ver = GetDeviceCaps (WinGDI.VERTSIZE) DO

Searching for 'res.res[Axis.T.'...
D:\dev2\cm3.2\m3-ui\ui\src\winvbt\WinScreenType.m3(71): res.res[Axis.T.Hor] := FLOAT(pix_hor) / FLOAT(mm_hor);
D:\dev2\cm3.2\m3-ui\ui\src\winvbt\WinScreenType.m3(72): res.res[Axis.T.Ver] := FLOAT(pix_ver) / FLOAT(mm_ver);


D:\dev2\cm3.2\m3-ui\ui\src\winvbt\WinScreenType.m3(89):PROCEDURE GetDeviceCaps (cap: Ctypes.int): INTEGER =
D:\dev2\cm3.2\m3-ui\ui\src\winvbt\WinScreenType.m3(93): res := WinGDI.GetDeviceCaps (hdc, cap);
D:\dev2\cm3.2\m3-ui\ui\src\winvbt\WinScreenType.m3(98): END GetDeviceCaps;
D:\dev2\cm3.2\m3-ui\ui\src\winvbt\WinScrnColorMap.m3(268): cnt := WinGDI.GetDeviceCaps (hdc, WinGDI.NUMCOLORS);
D:\dev2\cm3.2\m3-ui\ui\src\winvbt\WinScrnFont.m3(316): LogicalPixelsPerVertInch := WinGDI.GetDeviceCaps(er.hdc, WinGDI.LOGPIXELSY);
9 occurrence(s) have been found.


Searching for '1000.0'...
D:\dev2\cm3.2\m3-ui\ui\src\winvbt\WinScrnPixmap.m3(463): bmih.biXPelsPerMeter := ROUND (st.res[Axis.T.Hor] * 1000.0);
D:\dev2\cm3.2\m3-ui\ui\src\winvbt\WinScrnPixmap.m3(464): bmih.biYPelsPerMeter := ROUND (st.res[Axis.T.Ver] * 1000.0);


and just claiming 96dpi is the way to go.
Can you try that??


Specifically try setting res.res[Axis.T.Hor] and .Ver to 3.779527559055118.
Or heck to 3.3333 like my laptop has.


Or maybe claiming ignorance and setting biXPelsPerMeter and biYPelsPerMeter to 0???
Claiming ignorance feels better than lying of course. :)

Hm, so throw in also:

printf("LogicalPixelsX %u\n", GetDeviceCaps(hdc, LOGPIXELSX));
printf("LogicalPixelsY %u\n", GetDeviceCaps(hdc, LOGPIXELSY));

I get the magic number 96.

- Jay
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