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Re: [changeset] Missing ScreenSize & ScreenPixelsPerInch properties
From: |
Michael Goffioul |
Subject: |
Re: [changeset] Missing ScreenSize & ScreenPixelsPerInch properties |
Date: |
Thu, 22 Jan 2009 18:58:15 +0000 |
Better with the attachment.
On Thu, Jan 22, 2009 at 6:57 PM, Michael Goffioul
<address@hidden> wrote:
> I used the attached code instead (note the use LOGPIXELSX/Y and
> ReleaseDC). The results are:
>
> 1280x800 pixels
> 320x200 mm
> 101.6 resx
> 101.6 resy
> 96 resx_log
> 96 resy_log
> 101.6 avg dpi
> 32 bit depth
>
> Michael.
>
>
> On Thu, Jan 22, 2009 at 3:08 PM, John W. Eaton <address@hidden> wrote:
>> On 22-Jan-2009, Michael Goffioul wrote:
>>
>> | On Thu, Jan 22, 2009 at 2:13 PM, John W. Eaton <address@hidden> wrote:
>> | > On 22-Jan-2009, Shai Ayal wrote:
>> | >
>> | > | OK. But I don't know how hard it will be to make this cross platform.
>> | > | We might try to "steal" some code from fltk to discover the
>> | > | platform.
>> | >
>> | > Why? This seems to be a compile-time thing. We can discover if the
>> | > build system has X11, or is Windows, or is OS X, and then we just need
>> | > to know how to get the screen characteristics on those systems. I
>> | > provided the example code for X11. Now someone else needs to do the
>> | > same for Windows and
> OS X.
>> |
>> | Under Windows, it would be done using GetSystemMetrics and
>> | GetDeviceCaps functions.
>>
>> Does the following program do the right thing?
>>
>> Thanks,
>>
>> jwe
>>
>>
>> #include <iostream>
>>
>> #include <Windows.h>
>>
>> int
>> main (void)
>> {
>> HDC hdc = GetDC (0);
>>
>> if (hdc)
>> {
>> int ht = GetDeviceCaps (hdc, VERTRES);
>> int wd = GetDeviceCaps (hdc, HORZRES);
>>
>> std::cerr << wd << "x" << ht << " pixels" << std::endl;
>>
>> double ht_mm = GetDeviceCaps (hdc, VERTSIZE);
>> double wd_mm = GetDeviceCaps (hdc, HORZSIZE);
>>
>> std::cerr << wd_mm << "x" << ht_mm << " mm" << std::endl;
>>
>> double resy = wd * 25.4 / wd_mm;
>> double resx = ht * 25.4 / ht_mm;
>>
>> std::cerr << resx << " resx" << std::endl;
>> std::cerr << resy << " resx" << std::endl;
>>
>> std::cerr << (resx + resy) / 2 << " avg dpi" << std::endl;
>>
>> int depth = GetDeviceCaps (hdc, BITSPIXEL)
>>
>> std::cerr << depth << " bit depth" << std::endl;
>> }
>> else
>> std::cerr << "failed to get device context" << std::endl;
>>
>> return 0;
>> }
>>
>>
>
foo.cc
Description: Text document
- Re: [changeset] Missing ScreenSize & ScreenPixelsPerInch properties, John W. Eaton, 2009/01/21
- Re: [changeset] Missing ScreenSize & ScreenPixelsPerInch properties, Shai Ayal, 2009/01/21
- Re: [changeset] Missing ScreenSize & ScreenPixelsPerInch properties, John W. Eaton, 2009/01/21
- Re: [changeset] Missing ScreenSize & ScreenPixelsPerInch properties, Shai Ayal, 2009/01/22
- Re: [changeset] Missing ScreenSize & ScreenPixelsPerInch properties, John W. Eaton, 2009/01/22
- Re: [changeset] Missing ScreenSize & ScreenPixelsPerInch properties, Michael Goffioul, 2009/01/22
- Re: [changeset] Missing ScreenSize & ScreenPixelsPerInch properties, John W. Eaton, 2009/01/22
- Re: [changeset] Missing ScreenSize & ScreenPixelsPerInch properties, Michael Goffioul, 2009/01/22
- Re: [changeset] Missing ScreenSize & ScreenPixelsPerInch properties,
Michael Goffioul <=
- Re: [changeset] Missing ScreenSize & ScreenPixelsPerInch properties, John W. Eaton, 2009/01/22
Re: [changeset] Missing ScreenSize & ScreenPixelsPerInch properties, Ben Abbott, 2009/01/22