Hi Sean - thanks for the tip - that's fixed it :-)
On Tue, Sep 14, 2010 at 3:08 PM, Sean McNeil <seanmcne...@gmail.com> wrote:
> Take a look at the system property ro.sf.lcd_density. For a QVGA screen,
> you want to set it as
>
> ro.sf.lcd_density = 120
>
> to get the proper scaling. IMHO, the density should not be necessary and
> scaling could be done via the dpi. But for some reason it isn't done.
>
> Sean
>
> On 9/14/2010 4:54 PM, James Adams wrote:
>>
>> I'm porting Android onto some hardware with a 240x320 (portrait) display.
>>
>> My quesion is, does Android base all of its icon / widget scaling
>> based on the 'width' and 'height' (in mm) parameters returned from the
>> frame buffer driver?
>>
>> I expect it should, but it seems not to - what I want to do is get the
>> screen on my device to draw exactly the same as the emulator but it
>> doesn't....
>>
>> If I set up the emulator to be a 240x320 device I get:
>>
>> ...
>> I/gralloc ( 52): using (fd=22)
>> I/gralloc ( 52): id =
>> I/gralloc ( 52): xres = 240 px
>> I/gralloc ( 52): yres = 320 px
>> I/gralloc ( 52): xres_virtual = 240 px
>> I/gralloc ( 52): yres_virtual = 640 px
>> I/gralloc ( 52): bpp = 16
>> I/gralloc ( 52): r = 11:5
>> I/gralloc ( 52): g = 5:6
>> I/gralloc ( 52): b = 0:5
>> I/gralloc ( 52): width = 37 mm (164.756760 dpi)
>> I/gralloc ( 52): height = 49 mm (165.877548 dpi)
>> I/gralloc ( 52): refresh rate = 60.00 Hz
>> D/libEGL ( 52): egl.cfg not found, using default config
>> ...
>>
>> My screen driver doesn't report the physical dimensions so for now
>> until I;ve fixed it I have edited
>> hardware/libhardware/modules/gralloc/framebuffer.cpp to make the
>> 'width' and 'height' the same asthe emulator (and gralloc reports
>> info.width/height are set correctly):
>> (line 241...)
>> if (int(info.width)<= 0 || int(info.height)<= 0) {
>> // the driver doesn't return that information
>> // default to 160 dpi
>> LOGI("Driver doesn't report width/height - setting default...");
>> //info.width = ((info.xres * 25.4f)/160.0f + 0.5f);
>> //info.height = ((info.yres * 25.4f)/160.0f + 0.5f);
>> info.width = 37; // JRA same as emulator...
>> info.height = 49;
>> }
>>
>> BUT the screen icons on my device are still a different size to the
>> emulator - the emulator they are a bit smaller and fit much more
>> nicely, so what could be going wrong? Can anyone point me int he right
>> direction?
>>
>> NB I'm using 2.1 Eclair.
>>
>> Thanks,
>>
>> James.
>>
>
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